TY - BOOK
A1 - Freude, Ulrike
A1 - Kuznetsov, Sergey P.
A1 - Pikovskij, Arkadij
T1 - Strange nonchaotic attractors : dynamics between order and chaos in Quasiperiodically Forced Systems
Y1 - 2006
SN - 981-256633-3
PB - World Scientific
CY - Singapore
ER -
TY - JOUR
A1 - Köchy, Martin
T1 - Stochastic time series of daily precipitation for the interior of Israel
N2 - This contribution describes a generator of stochastic time series of daily precipitation for the interior of Israel from c. 90 to 900 mm mean annual precipitation (MAP) as a tool for studies of daily rain variability. The probability of rainfall on a given day of the year is described by a regular Gaussian peak curve function. The amount of rain is drawn randomly from an exponential distribution whose mean is the daily mean rain amount (averaged across years for each day of the year) described by a flattened Gaussian peak curve. Parameters for the curves have been calculated from monthly aggregated, long-term rain records from seven meteorological stations. Parameters for arbitrary points on the MAP gradient are calculated from a regression equation with MAP as the only independent variable. The simple structure of the generator allows it to produce time series with daily rain patterns that are projected under climate change scenarios and simultaneously control MAP. Increasing within-year variability of daily precipitation amounts also increases among-year variability of MAP as predicted by global circulation models. Thus, the time series incorporate important characteristics for climate change research and represent a flexible tool for simulations of daily vegetation or surface hydrology dynamics.
Y1 - 2006
UR - 1960 = dx.doi.org/10.1560/IJES_55_2_103
ER -
TY - GEN
A1 - Köchy, Martin
T1 - Stochastic time series of daily precipitation for the interior of Israel
N2 - This contribution describes a generator of stochastic time series of daily precipitation for the interior of Israel from c. 90 to 900 mm mean annual precipitation (MAP) as a tool for studies of daily rain variability. The probability of rainfall on a given day of the year is described by a regular Gaussian peak curve function. The amount of rain is drawn randomly from an exponential distribution whose mean is the daily mean rain amount (averaged across years for each day of the year) described by a flattened Gaussian peak curve. Parameters for the curves have been calculated from monthly aggregated, long-term rain records from seven meteorological stations. Parameters for arbitrary points on the MAP gradient are calculated from a regression equation with MAP as the only independent variable. The simple structure of the generator allows it to produce time series with daily rain patterns that are projected under climate change scenarios and simultaneously control MAP. Increasing within-year variability of daily precipitation amounts also increases among-year variability of MAP as predicted by global circulation models. Thus, the time series incorporate important characteristics for climate change research and represent a flexible tool for simulations of daily vegetation or surface hydrology dynamics.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 029
KW - stochastische Zeitreihen
KW - täglicher Niederschlag
KW - Israel
KW - Klimawandel
KW - stochastic time series
KW - daily precipitation
KW - Israel
KW - climate change
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-13155
ER -
TY - JOUR
A1 - Makuch, Martin
A1 - Brilliantov, Nikolai V.
A1 - Sremcevic, Miodrag
A1 - Spahn, Frank
A1 - Krivov, Alexander V.
T1 - Stochastic circumplanetary dynamics of rotating non-spherical dust particles
JF - Planetary and space science
N2 - We develop a model of stochastic radiation pressure for rotating non-spherical particles and apply the model to circumplanetary dynamics of dust grains. The stochastic properties of the radiation pressure are related to the ensemble-averaged characteristics of the rotating particles, which are given in terms of the rotational time-correlation function of a grain. We investigate the model analytically and show that an ensemble of particle trajectories demonstrates a diffusion-like behaviour. The analytical results are compared with numerical simulations, performed for the motion of the dusty ejecta from Deimos in orbit around Mars. We find that the theoretical predictions are in a good agreement with the simulation results. The agreement however deteriorates at later time, when the impact of non-linear terms, neglected in the analytic approach, becomes significant. Our results indicate that the stochastic modulation of the radiation pressure can play an important role in the circumplanetary dynamics of dust and may in case of some dusty systems noticeably alter an optical depth. (c) 2006 Elsevier Ltd. All rights reserved.
KW - Mars
KW - Deimos
KW - ejecta
KW - stochastics
KW - radiation pressure
Y1 - 2006
U6 - https://doi.org/10.1016/j.pss.2006.05.006
SN - 0032-0633
VL - 54
IS - 9-10
SP - 855
EP - 870
PB - Elsevier
CY - Oxford
ER -
TY - JOUR
A1 - Schmidt, Bernd
A1 - Nave, Stefan
T1 - Stereoselective syntheses of enantiomerically pure 2,5-disubstituted dihydropyrans based on olefin metathesis
JF - The journal of organic chemistry
N2 - A short synthesis of 2,5-disubstituted dihydropyrans starting from D-mannitol as a chiral building block is described. Our synthetic approach combines ruthenium-catalyzed ring closing olefin metathesis and palladium-catalyzed nucleophilic substitution.
Y1 - 2006
U6 - https://doi.org/10.1021/jo061190k
SN - 0022-3263
VL - 71
IS - 19
SP - 7364
EP - 7369
PB - American Chemical Society
CY - Washington
ER -
TY - JOUR
A1 - Shainyan, Bagrat A.
A1 - Ushakov, Igor A.
A1 - Koch, Andreas
A1 - Kleinpeter, Erich
T1 - Stereodynamics of 1-(methylsulfonyl)-3,5-bis(trifluoromethylsulfonyl)-1,3,5-triazinane: Experimental and theoretical analysis
N2 - Dynamic NMR of 1-(methylsulfonyl)-3,5-bis(trifluoromethylsulfonyl)-1,3,5-triazinane reveals the existence of three conformers and two dynamic processes: ring inversion and rotation about the N-S bond, both processes having Delta G(double dagger) = 13.5 kcal/mol. An unprecedented large reverse Perlin effect (J(CHax) > J(CHeq)) was found experimentally and calculated theoretically.
Y1 - 2006
UR - http://pubs.acs.org/doi/full/10.1021/jo061112x
U6 - https://doi.org/10.1021/Jo061112x
ER -
TY - JOUR
A1 - Leupold, Dieter
A1 - Teuchner, Klaus
A1 - Ehlert, Jürgen
A1 - Irrgang, Klaus-Dieter
A1 - Renger, Gernot
A1 - Lokstein, Heiko
T1 - Stepwise two-photon excited fluorescence from higher excited states of chlorophylls in photosynthetic antenna complexes
Y1 - 2006
UR - http://www.jbc.org/
U6 - https://doi.org/10.1074/jbc.M600080200
SN - 0021-9258
ER -
TY - THES
A1 - Ott, Christian David
T1 - Stellar iron core collapse in {3+1} general relativity and the gravitational wave signature of core-collapse supernovae
T1 - Stellarer Eisenkernkollaps in Allgemeiner Relativitätstheorie und die Gravitationswellensignatur von Kern-Kollaps-Supernovae
N2 - I perform and analyse the first ever calculations of rotating stellar iron core collapse in {3+1} general relativity that start out with presupernova models from stellar evolutionary calculations and include a microphysical finite-temperature nuclear equation of state, an approximate scheme for electron capture during collapse and neutrino pressure effects. Based on the results of these calculations, I obtain the to-date most realistic estimates for the gravitational wave signal from collapse, bounce and the early postbounce phase of core collapse supernovae. I supplement my {3+1} GR hydrodynamic simulations with 2D Newtonian neutrino radiation-hydrodynamic supernova calculations focussing on (1) the late postbounce gravitational wave emission owing to convective overturn, anisotropic neutrino emission and protoneutron star pulsations, and (2) on the gravitational wave signature of accretion-induced collapse of white dwarfs to neutron stars.
N2 - Ich präsentiere die ersten Computer-Simulationen des rotierenden Kollapses stellarer Eisenkerne, die in der {3+1}-Zerlegung der Allgemeinen Relativitätstheorie durchgeführt werden und Vorsupernova-Sternmodelle aus Sternentwicklungsrechnungen, eine heiße nukleare Zustandsgleichung und ein näherungsweises Verfahren zur Beschreibung des Elektroneneinfangs enthalten und Neutrinodruck-Effekte berücksichtigen. Basierend auf den Ergebnissen dieser Rechnungen erhalte ich die zur Zeit realistischsten Vorhersagen für das Gravitationswellensignal der Kollaps, Abprall, Abkling und frühen Nach-Abprallphase einer Kern-Kollaps-Supernova. Neben den {3+1} Simulationen diskutiere ich newtonsche axisymmetrische Kern-Kollaps-Supernova-Simulationen mit Schwerpunkten auf: (1) der Gravitationswellenabstrahlung in der späten Nach-Abprallphase durch Konvektionsströmungen, anisotropische Neutrinoemission und Proto-Neutronenstern Pulsationen und (2) der Gravitationswellensignatur des Kollapses weißer Zwergsterne zu Neutronensternen, der durch Akkretion eingeleitet wird.
KW - Gravitationswellen
KW - Kern-Kollaps-Supernovae
KW - Allgemeine Relativitätstheorie
KW - Gravitational Waves
KW - Core-Collapse Supernovae
KW - General Relativity
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12986
ER -
TY - BOOK
A1 - Nosova, Olga
A1 - Bartels, Knut
T1 - Statistical analysis of the corporate governance system in the Ukraine: problems and development perspectives
N2 - This paper investigates the formation of the ownership structure and the corporate governance system of the Ukraine as a country in transition. Numerous studies consider that privatization results in the establishment of a proprietors’ motivation mechanism. On the other hand it causes ownership concentration in the hands of a few shareholders and managers. The goal of economic reform in transition and, largely, its pace, is measured by the degree to which shareholders participate in short- and long-term corporate value creation. Shareholder access to such created value depends on the ability of corporate “insiders”, especially executives and management, to claim a disproportionate share of corporate value (the “insider effect”). An econometric analysis of the correlation between privatization and macroeconomic factors studies the degree of effectiveness of economic reforming in Ukrainian regions.
T3 - Statistische Diskussionsbeiträge - 25
KW - corporate governance
KW - shareholders
KW - econometric modelling
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12188
ER -
TY - JOUR
A1 - Fleschhut, Jens
A1 - Kratzer, Frank
A1 - Rechkemmer, Gerhard
A1 - Kulling, Sabine E.
T1 - Stability and biotransformation of various dietary anthocyanins in vitro
N2 - Background Anthocyanins, which are found in high concentrations in fruit and vegetable, may play a beneficial role in retarding or reversing the course of chronic degenerative diseases. However, little is known about the biotransformation and the metabolism of anthocyanins so far. Aim of the study The aim of the study was to investigate possible transformation pathways of anthocyanins by human faecal microflora and by rat liver microsomes as a source of cytochrome P450 enzymes as well as of glucuronyltransferases. Methods Pure anthocyanins, an aqueous extract of red radish as well as the assumed degradation products were incubated with human faecal suspension. The incubation mixtures were purified by solid-phase extraction and analysed by HPLC/DAD/MS and GC/MS. Quantification was done by the external standard method. Furthermore the biotransformation of anthocyanins by incubation with rat liver microsomes in the presence of the cofactor NADPH (as a model for the phase I oxidation) and in the presence of activated glucuronic acid (as a model for the phase II glucuronidation) was investigated. Results Glycosylated and acylated anthocyanins were rapidly degraded by the intestinal microflora after anaerobic incubation with a human faecal suspension. The major stable products of anthocyanin degradation are the corresponding phenolic acids derived from the B-ring of the anthocyanin skeleton. Anthocyanins were not metabolised by cytochrome P450 enzymes, neither hydroxylated nor demethylated. However they were glucuronidated by rat liver microsomes to several products. Conclusions The gut microflora seem to play an important role in the biotransformation of anthocyanins. A rapid degradation could be one major reason for the poor bioavailability of anthocyanins in pharmacokinetic studies described so far in the literature. The formation of phenolic acids as the major stable degradation products gives an important hint to the fate of anthocyanins in vivo
Y1 - 2006
UR - http://www.springerlink.com/content/103683
U6 - https://doi.org/10.1007/s00394-005-0557-8
SN - 1436-6207
ER -
TY - JOUR
A1 - Thiel, Marco
A1 - Romano, Maria Carmen
A1 - Kurths, Jürgen
T1 - Spurious structures in recurrence plots induced by embedding
N2 - In this paper we show that delay embedding produces spurious structures in a recurrence plot (RP) that are not present in the real attractor. We analyze typical sets of simulated data, such as white noise and data from the chaotic Rossler system to show the relevance of this effect. In the second part of the paper we show that the second order Renyi entropy and the correlation dimension are dynamical invariants that can be estimated from Recurrence Plots with arbitrary embedding dimension and delay
Y1 - 2006
U6 - https://doi.org/10.1007/s11071-006-2010-9
ER -
TY - JOUR
A1 - Tirok, Katrin
A1 - Gaedke, Ursula
T1 - Spring weather determines the relative importance of ciliates, rotifers and crustaceans for the initiation of the clear-water phase in a large, deep lake
N2 - Clear-water phase (CWP) is an important event in seasonal plankton succession. We examined the influence of all herbivorous zooplankton on its initiation under different weather and climatic conditions using up to 19 years of observations from the large, deep Lake Constance (Europe) and estimates of relative clearance rates. A CWP occurred regularly, even if daphnid biomass was still very low. CWP was attributed to strong grazing either by a daphnid- dominated zooplankton community or by a diverse assemblage consisting of micro- and meso-zooplankton. Both types of zooplankton communities occurred with approximately the same frequency. The timing of the CWP was unrelated to the North Atlantic Oscillation (NAO) but correlated with the wind-dependent intensity of deep vertical mixing 3 months earlier, during early spring. Less mixing enabled early growth of phytoplankton, ciliates and rotifers despite low temperatures, which prevented daphnid development at this time. This resulted in enhanced grazing of ciliates and rotifers, which increased the importance of phytoplankton less edible for most ciliates, rotifers and daphnids. Ciliates clearly dominated the grazing pressure on phytoplankton throughout spring, maintaining high biomasses together with the phytoplankton for up to 2 months. A CWP was observed when herbivores grazing on larger phytoplankton developed in addition to ciliates
Y1 - 2006
ER -
TY - JOUR
A1 - Kumke, Michael Uwe
A1 - Dosche, Carsten
A1 - Flehr, Roman
A1 - Trowitzsch-Kienast, Wolfram
A1 - Löhmannsröben, Hans-Gerd
T1 - Spectroscopic characterization of the artificial siderophore pyridinochelin
Y1 - 2006
UR - http://www.znaturforsch.com/c.htm
SN - 0939-5075
ER -
TY - CHAP
A1 - Hainzl, Sebastian
A1 - Scherbaum, Frank
A1 - Zöller, Gert
T1 - Spatiotemporal earthquake patterns
N2 - Interdisziplinäres Zentrum für Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7267
N1 - [Poster]
ER -
TY - THES
A1 - Mungur, Rajsree
T1 - Spatio-temporal analysis of florigenic signals in Arabidopsis thaliana, Sinapis alba and Brassica napus
T1 - Zeitabhängige Analyse von blühinduzierenden Signalen in Arabidopsis thaliana, Sinapis alba und Brassica napus
N2 - Daylength is one of several parameters controlling flowering time in many plant species. The day length is perceived in leaves, but how the floral signal is transduced to the shoot apex via the phloem to induce flowering remains to be elucidated. This study aimed at the identification of new candidates involved in the induction of flowering by employing three plant species, Arabidopsis thaliana, Sinapis alba and Brassica napus in combination with transcript profiling by Affymetrix chip hybridization, metabolite profiling by gas chromatography – mass spectrometry and targeted protein analysis using antibodies. All analyses were performed on tissue-specific samples and focused on phloem sap or phloem exudates. To find common transcript and metabolite candidates potentially associated with the floral transition, two independent induction systems in Arabidopsis were used: a photoextension system, whereby plants received fourteen additional hours of light, and a parallel dexamethasone-inducible system, which was centered on the induction of the known flowering gene CONSTANS (CO). Identification of signals preceding the CO cascade was possible using the light extension regime, while downstream events dependent on CO activation were compared in both systems. Altogether, a number of interesting transcript and metabolite candidates were identified in both systems with some degree of overlap. Sinapis alba was used to investigate the universality of the floral signals between species. Comparisons of metabolite data revealed a few common candidates that may prove interesting for further studies. In addition, a targeted approach was carried out to investigate the presence of the Flowering Locus T (FT) protein during different stages of flower development using an antibody. Interesting changes in the sizes of antigens from rape phloem were seen and appeared consistent in Arabidopsis and to a lesser extent in Sinapis. Overall, the broad surveying approaches for transcripts and metabolites used in this study revealed several new potential candidates involved in the induction and/or regulation of flowering. As far as the protein work, additional experiments will reveal the link between FT and floral induction as well as its role in maintaining the floral state using the abovementioned plant species.
N2 - Die Tageslänge ist in vielen Pflanzenarten einer der Parameter, welche die Blütenbildung kontrollieren. Die Tageslänge wird in Blättern gemessen, aber wie das blühinduzierende Signal über das Phloem in den Apex übertragen wird ist bisher nicht aufgeklärt. Die vorliegende Arbeit hatte das Ziel neue Kandidaten zu identifizieren, die an der Blühinduktion beteiligt sind. Dazu wurden die drei Pflanzenarten Arabidopsis thaliana, Sinapis alba und Brassica napus auf der Ebene von Transkripten durch Affymetrix Chip Hybridisierungen, Metaboliten durch Gaschromatographie-Massenspektrometrie und ausgesuchten Proteinen durch Antikörper analysiert. Alle Untersuchungen wurden an gewebespezifischen Proben vorgenommen und waren auf Phloemsaft bzw. Phloemexsudate fokussiert. Um gemeinsame Transkript- und Metabolitkandidaten zu ermitteln, welche mit der Blühinduktion in Zusammenhang stehen, wurden zwei unabhängige Induktionssysteme in Arabidopsis verwendet: Ein Photoextensions-System, in dem die Pflanzen vierzehn zusätzlichen Stunden Licht ausgesetzt wurden und ein paralleles Dexamethason-induzierbares System, das die gezielte Aktivierung des bekannten blühinduzierenden Gens CONSTANS (CO) ermöglicht. Die Identifikation von CO-vorgelagerten Signalen war in dem Photoextensions-System möglich, während der CO-Aktivierung nachgelagerte Ereignisse in beiden Systemen verglichen werden konnten. Zusammengenommen konnten mit beiden Systemen eine Reihe von interessanten Transkript- und Metabolitkandidaten ermittelt werden, welche auch teilweise überlappten. Anschließend wurde Sinapis alba verwendet, um die Universalität der blühinduzierenden Signale in verschiedenen Pflanzenarten zu untersuchen. Vergleiche der Metabolitendaten ergaben ein paar gemeinsame Kandidaten, welche für weitergehende Untersuchungen interessant sein könnten. Zusätzlich wurden mittels Antikörpern gezielte Untersuchungen bezüglich der Präsenz des Flowering Locus T (FT) Proteins während verschiedener Stadien der Blütenentwicklung durchgeführt. Diese Untersuchungen zeigten interessante Änderungen der Größe des Antigens in Raps Phloemsaft, welche auch in Arabidopsis und in geringerem Maße in Sinapis sichtbar waren. Zusammengefasst resultierten die umfassenden Transkript- und Metabolitenmessungen, die in dieser Arbeit verwendet wurden, in einer Reihe von neuen möglichen Kandidaten, welche an der Induktion und/oder Regulation der Blütenbildung beteiligt sein könnten. Bezüglich des Proteins FT sind zusätzliche Experimente notwendig, um seine Rolle bei der Blühinduktion bzw. bei der Aufrechterhaltung des blühenden Zustandes aufzudecken.
KW - Florigen
KW - Florigen
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-9861
ER -
TY - JOUR
A1 - Vasconcelos, D. B.
A1 - Lopes, S. R.
A1 - Viana, R. L.
A1 - Kurths, Jürgen
T1 - Spatial recurrence plots
N2 - We propose an extension of the recurrence plot concept to perform quantitative analyzes of roughness and disorder of spatial patterns at a fixed time. We introduce spatial recurrence plots (SRPs) as a graphical representation of the pointwise correlation matrix, in terms of a two-dimensional spatial return plot. This technique is applied to the study of complex patterns generated by coupled map lattices, which are characterized by measures of complexity based on SRPs. We show that the complexity measures we propose for SRPs provide a systematic way of investigating the distribution of spatially coherent structures, such as synchronization domains, in lattice profiles. This approach has potential for many more applications, e.g., in surface roughness analyzes
Y1 - 2006
UR - http://pre.aps.org/pdf/PRE/v73/i5/e056207
U6 - https://doi.org/10.1103/Physreve.73.056207
ER -
TY - GEN
A1 - Neye, Gundula
A1 - Wallschläger, Hans-Dieter
A1 - Tiedemann, Ralph
T1 - Song dialect boundaries in the Yellowhammer: Do they restrict gene flow?
T2 - Journal of ornithology
Y1 - 2006
SN - 0021-8375
VL - 147
IS - Supplement 1
SP - 219
EP - 219
PB - Blackwell
CY - New York
ER -
TY - JOUR
A1 - Zen, Achmad
A1 - Bilge, Askin
A1 - Galbrecht, Frank
A1 - Alle, Ronald
A1 - Meerholz, Klaus
A1 - Grenzer, Jörg
A1 - Neher, Dieter
A1 - Scherf, Ullrich
A1 - Farrell, Tony
T1 - Solution processable organic field-effect transistors utilizing an alpha,alpha '-dihexylpentathiophene- based swivel cruciform
Y1 - 2006
UR - http://pubs.acs.org/doi/full/10.1021/ja0573357
U6 - https://doi.org/10.1021/Ja0573357
ER -
TY - JOUR
A1 - Heinken, Thilo
A1 - Schmidt, Marcus
A1 - von Oheimb, Goddert
A1 - Kriebitzsch, Wolf-Ulrich
A1 - Ellenberg, Hermann
T1 - Soil seed banks near rubbing trees indicate dispersal of plant species into forests by wild boar
N2 - Current knowledge about processes that generate long-distance dispersal of plants is still limited despite its importance for persistence of populations and colonization of new potential habitats. Today wild Large mammals are presumed to be important vectors for long-distance transport of diaspores within and between European temperate forest patches, and in particular wild boars recently came into focus. Here we use a specific habit of wild boar, i.e. wallowing in mud and subsequent rubbing against trees, to evaluate epizoochorous dispersal of vascular plant diaspores. We present soil seed bank data from 27 rubbing trees versus 27 control trees from seven forest areas in Germany. The mean number of viable seeds and the plant species number were higher in soil samples near rubbing trees compared with control trees. Ten of the 20 most frequent species were more frequent, and many species exclusively appeared in the soil samples near rubbing trees. The large number of plant species and seeds - more than 1000 per tree - in the soils near rubbing trees is difficult to explain unless the majority were dispersed by wild boar. Hooked and bristly diaspores, i.e. those adapted to epizoochory, were more frequent; however, many species with unspecialized diaspores occurred exclusively near rubbing trees. As opposed to plant species closely tied to forests species which occur both in forest and open vegetation and non-forest species were more frequent near rubbing trees compared with controls. These findings are consistent with previous studies on diaspore loads in the coats and hooves of shot wild boars. However, our method allows to identify the transport of diaspores from the open landscape into forest stands, where they might especially emerge after disturbance, and a clustered distribution of epizoochorically dispersed seeds. Moreover, accumulation of seeds of wetness indicators near rubbing trees demonstrates directed dispersal of plant species inhabiting wet places among remote wallows.
Y1 - 2006
UR - http://www.sciencedirect.com/science/journal/14391791
U6 - https://doi.org/10.1016/j.baae.2005.04.006
SN - 1439-1791
ER -
TY - GEN
A1 - Heinken, Thilo
A1 - Schmidt, Marcus
A1 - von Oheimb, Goddert
A1 - Kriebitzsch, Wolf-Ulrich
A1 - Ellenberg, Hermann
T1 - Soil seed banks near rubbing trees indicate dispersal of plant species into forests by wild boar
N2 - Current knowledge about processes that generate long-distance dispersal of plants is still limited despite its importance for persistence of populations and colonization of new potential habitats. Today wild large mammals are presumed to be important vectors for long-distance transport of diaspores within and between European temperate forest patches, and in particular wild boars recently came into focus. Here we use a specific habit of wild boar, i.e. wallowing in mud and subsequent rubbing against trees, to evaluate epizoic dispersal of vascular plant diaspores. We present soil seed bank data from 27 rubbing trees versus 27 control trees from seven forest areas in Germany. The mean number of viable seeds and the plant species number were higher in soil samples near rubbing trees compared with control trees. Ten of the 20 most frequent species were more frequent, and many species exclusively appeared in the soil samples near rubbing trees. The large number of plant species and seeds – approximated > 1000 per tree – in the soils near rubbing trees is difficult to explain unless the majority were dispersed by wild boar. Hooked and bristly diaspores, i.e. those adapted to epizoochory, were more frequent, above that many species with unspecialised diaspores occurred exclusively near rubbing trees. Different to plant species closely tied to forest species which occur both in forest and open vegetation, and non-forest species were more frequent near rubbing trees compared with controls. These findings are consistent with previous studies on diaspore loads in the coats and hooves of shot wild boars. However, our method allows to identify the transport of diaspores from the open landscape into forest stands where they might especially emerge after disturbance, and a clustered distribution of epizoochorically dispersed seeds. Moreover, accumulation of seeds of wetness indicators near rubbing trees demonstrates directed dispersal of plant species inhabiting wet places between remote wallows.
N2 - Das aktuelle Wissen über Prozesse, die zur Fernausbreitung von Pflanzen führen, ist trotz ihrer Bedeutung für das Überleben von Populationen und die Besiedlung neuer potenzieller Habitate noch immer sehr begrenzt. Wildlebende Großsäuger sind heutzutage vermutlich wichtige Vektoren für den Ferntransport von Diasporen innerhalb und zwischen den einzelnen Waldflächen in Mitteleuropa, und speziell das Wildschwein (Sus scrofa L.) spielt dabei offenbar eine herausragende Rolle. Wir nutzen hier ein spezifisches Verhalten des Wildschweins – Suhlen im Schlamm und nachfolgendes Scheuern an sogenannten Malbäumen – um die epizoochore Ausbreitung von Gefäßpflanzen-Diasporen einzuschätzen. Dargestellt werden die Ergebnisse von Samenbank-Untersuchungen von 27 Malbäumen im Vergleich zu 27 Kontrollbäumen aus sieben Waldgebieten in Deutschland. Sowohl die mittlere Zahl lebensfähiger Samen als auch die Artenzahl waren höher in Bodenproben neben Malbäumen. Zehn der 20 in der Samenbank verbreitetsten Pflanzenarten hatten hier ihren Schwerpunkt, und viele Arten kamen ausschließlich in den neben Malbäumen gewonnenen Proben vor. Die große Zahl von Pflanzenarten und Samen – zumindest > 1000 pro Baum – im Boden an Malbäumen lässt sich nur durch die Aktivität der Wildschweine erklären. Mit Haken oder Borsten ausgestattete, d.h. an Epizoochorie angepasste Diasporen waren häufiger, aber auch viele Arten mit unspezialisierten Diasporen kamen ausschließlich in der Samenbank bei Malbäumen vor. Anders als weitgehend an Wald gebundene Pflanzenarten waren solche, die sowohl im Wald und im Offenland vorkommen, sowie nicht im Wald vorkommende Arten häufiger neben Malbäumen als neben Kontrollbäumen. Diese Befunde stimmen mit denen früherer Untersuchungen von Diasporenladungen im Fell und in den Hufen geschossener Wildschweine überein. Unsere Methode erlaubt darüber hinaus aber die Identifizierung des Diasporentransports aus dem Offenland in die Waldbestände, wo sie insbesondere nach Störungen keimen dürften, sowie einer ungleichmäßigen Verteilung epizoochor ausgebreiteter Diasporen. Außerdem zeigt die Akkumulation von Samen von Nässezeigern neben den Malbäumen eine gezielte Ausbreitung nasse Standorte bewohnender Pflanzenarten zwischen entfernt gelegenen Suhlen.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 150
KW - Diaspore morphology
KW - directed dispersal
KW - epizoochory
KW - long-distance dispersal
KW - Sus scrofa
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-46476
ER -
TY - JOUR
A1 - Gronau, Norbert
A1 - Fröming, Jane
A1 - Schmid, Simone
T1 - Skill Management
Y1 - 2006
ER -
TY - THES
A1 - Brunnemann, Johannes
T1 - Singularities of Classical Relativity within the Framework of Loop Quantum Gravity
Y1 - 2006
CY - Potsdam
ER -
TY - JOUR
A1 - Henneberg, Oliver
A1 - Pietsch, Ullrich
A1 - Panzner, Tobias
A1 - Geue, Thomas
A1 - Finkelstein, Kenneth D.
T1 - Simultaneous X-ray and visible light diffraction for the investigation of surface relief and density grating formation in azobenzene containing polymer films
N2 - The development of surface relief and density patterns in azobenzene polymer films was studied by diffraction at two different wavelengths. We used x-ray diffraction of synchrotron radiation at 0.124 nm in combination with visible light diffraction at a wavelength of 633 nm. In contrast to visible light scattering x-ray diffraction allows the separation of a surface relief and a density grating contribution due to the different functional dependence of the scattering power. Additionally, the x-ray probe is most sensitive for the onset of the surface grating formation
Y1 - 2006
UR - http://www.informaworld.com/smpp/title~content=t713644168~db=all
U6 - https://doi.org/10.1080/15421400500383345
SN - 1542-1406
ER -
TY - JOUR
A1 - Sommer, Michael
A1 - Kaczorek, Danuta
A1 - Kuzyakov, Yakov
A1 - Breuer, Jörn
T1 - Silicon pools and fluxes in soils and landscapes : a review
N2 - Silicon (Si) is the second-most abundant element in the earth's crust. In the pedosphere, however, huge spans of Si contents occur mainly caused by Si redistribution in soil profiles and landscapes. Here, we summarize the current knowledge on the different pools and fluxes of Si in soils and terrestrial biogeosystems. Weathering and subsequent release of soluble Si may lead to (1) secondarily bound Si in newly formed Al silicates, (2) amorphous silica precipitation on surfaces of other minerals, (3) plant uptake, formation of phytogenic Si, and subsequent retranslocation to soils, (4) translocation within soil profiles and formation of new horizons, or (5) translocation out of soils (desilication). The research carried out hitherto focused on the participation of Si in weathering processes, especially in clay neoformation, buffering mechanisms for acids in soils or chemical denudation of landscapes. There are, however, only few investigations on the characteristics and controls of the low-crystalline, almost pure silica compounds formed during pedogenesis. Further, there is strong demand to improve the knowledge of (micro)biological and rhizosphere processes contributing to Si mobilization, plant uptake, and formation of phytogenic Si in plants, and release due to microbial decomposition. The contribution of the biogenic Si sources to Si redistribution within soil profiles and desilication remains unknown concerning the pools, rates, processes, and driving forces. Comprehensive studies considering soil hydrological, chemical, and biological processes as well as their interactions at the scale of pedons and landscapes are necessary to make up and model the Si balance and to couple terrestrial processes with Si cycle of limnic, fluvial, or marine biogeosystems
Y1 - 2006
ER -
TY - JOUR
A1 - Hausen, Harald
A1 - Bleidorn, Christoph
T1 - Significance of chaetal arrangement for maldanid systematics (Annelida : Maldanidae)
JF - Scientia marina : international journal on marine sciences
N2 - Maldanids are usually divided into several subfamilies: Euclymeninae, Lumbriclymeninae, Maldaninae, Nicomachinae, Rhodininae, Clymenurinae, Notoproctinae, and Boguinae. The taxonomy of maldanids and the delimination of these taxa are mainly based on head morphology, total number of segments, chaetal structure, shape of the pygidium, and position of the anus. The maldanid ingroup relationships, as well as the monophyly of the proposed subfamilies, have so far not been investigated. Pilgrim (1977) described a shift of the notopodial chaetal rows from a transverse direction in anterior chaetigers to a more longitudinal one in posterior chaetigers in Clymene torquata (Leidy, 1855) and Euclymene oerstedii (Claparede, 1863), both belonging to the Euclymeninae. We investigated several maldanid species to assess the usefulness of this character for maldanid systematics and used 3D-reconstruction techniques to reveal the complete geometry of the chaetal sacs. Our investigation shows that a shift is apparent in Euclymene, Axiothella, Johnstonia (all Euclymeninae) and Clymenura (Clymenurinae), but absent in species like Maldane sarsi (Malmgren, 1865), Metasychis disparidentata (Moore, 1904) (both Maldaninae) and Petaloproctus borealis Ardwisson, 1906 (Nicomachinae). The shift is not typical for sedentary polychaetes and is apomorphic within maldanid polychaetes. It thus argues for a close relationship between Euclymeninae and Clymenurinae. The investigation of further maldanid species of different subfamilies may shed additional light on maldanid systematics.
KW - Annelida
KW - Polychaeta
KW - Maldanidae
KW - systematics
KW - chaetae
KW - chaetal arrangement
Y1 - 2006
SN - 0214-8358
VL - 70
SP - 75
EP - 79
PB - Institut de Ciències del Mar
CY - Barcelona
ER -
TY - JOUR
A1 - Lokstein, Heiko
A1 - Hedke, Boris
A1 - Mustroph, Angelika
A1 - Kühn, Christina
T1 - Signals, sensing, and plant primary metabolism
Y1 - 2006
ER -
TY - JOUR
A1 - Zou, Yong
A1 - Thiel, M.
A1 - Romano, Maria Carmen
A1 - Kurths, Jürgen
A1 - Bi, Q.
T1 - Shrimp structure and associated dynamics in parametrically excited oscillators
JF - International journal of bifurcation and chaos : in applied sciences and engineering
N2 - We investigate the bifurcation structures in a two-dimensional parameter space (PS) of a parametrically excited system with two degrees of freedom both analytically and numerically. By means of the Renyi entropy of second order K-2, which is estimated from recurrence plots, we uncover that regions of chaotic behavior are intermingled with many complex periodic windows, such as shrimp structures in the PS. A detailed numerical analysis shows that, the stable solutions lose stability either via period doubling, or via intermittency when the parameters leave these shrimps in different directions, indicating different bifurcation properties of the boundaries. The shrimps of different sizes offer promising ways to control the dynamics of such a complex system.
KW - bifurcation analysis
KW - recurrence plot
KW - period doubling
KW - intermittency
Y1 - 2006
U6 - https://doi.org/10.1142/S0218127406016987
SN - 0218-1274
VL - 16
IS - 12
SP - 3567
EP - 3579
PB - World Scientific Publ. Co
CY - Singapore
ER -
TY - GEN
A1 - Rolfs, Martin
A1 - Laubrock, Jochen
A1 - Kliegl, Reinhold
T1 - Shortening and Prolongation of Saccade Latencies Following Microsaccades
N2 - When the eyes fixate at a point in a visual scene, small saccades rapidly shift the image on the retina. The effect of these microsaccades on the latency of subsequent large-scale saccades may be twofold. First, microsaccades are associated with an enhancement of visual perception. Their occurrence during saccade target perception should, thus, decrease saccade latencies. On the other hand, microsaccades likely indicate activity in fixation-related oculomotor neurons. These represent competitors to saccade-related cells in the interplay of gaze holding and shifting. Consequently, an increase in saccade latencies after microsaccades would be expected. Here, we present evidence for both aspects of microsaccadic impact on saccade latency. In a delayed response task, participants made saccades to visible or memorized targets. First, microsaccade occurrence up to 50 ms before target disappearance correlated with 18 ms (or 8%) faster saccades to memorized targets. Second, if microsaccades occurred shortly (i.e., < 150 ms) before a saccade was required, saccadic reaction times in visual and memory trials were increased by about 40 ms (or 16%). Hence, microsaccades can have opposite consequences for saccade latencies, pointing at a differential role of these fixational eye movements in preparation of motor programs.
T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - paper 242
KW - Fixational eye movements
KW - Memory-guided saccades
KW - Visually-guided saccades
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57012
ER -
TY - JOUR
A1 - Rolfs, Martin
A1 - Laubrock, Jochen
A1 - Kliegl, Reinhold
T1 - Shortening and prolongation of saccade latencies following microsaccades
N2 - When the eyes fixate at a point in a visual scene, small saccades rapidly shift the image on the retina. The effect of these microsaccades on the latency of subsequent large-scale saccades may be twofold. First, microsaccades are associated with an enhancement of visual perception. Their occurrence during saccade target perception could, thus, decrease saccade latencies. Second, microsaccades are likely to indicate activity in fixation-related oculomotor neurons. These represent competitors to saccade-related cells in the interplay of gaze holding and shifting. Consequently, an increase in saccade latencies would be expected after microsaccades. Here, we present evidence for both aspects of microsaccadic impact on saccade latency. In a delayed response task, participants made saccades to visible or memorized targets. First, microsaccade occurrence up to 50 ms before target disappearance correlated with 18 ms (or 8%) faster saccades to memorized targets. Second, if microsaccades occurred shortly (i.e., < 150 ms) before a saccade was required, mean saccadic reaction time in visual and memory trials was increased by about 40 ms (or 16%). Hence, microsaccades can have opposite consequences for saccade latencies, pointing at a differential role of these fixational eye movements in the preparation of saccade motor programs
Y1 - 2006
UR - http://www.springerlink.com/content/y67j226367352u28/fulltext.html
U6 - https://doi.org/10.1007/s00221-005-0148-1
ER -
TY - JOUR
A1 - Medrano-T., R. O.
A1 - Baptista, Murilo da Silva
A1 - Caldas, Ibere Luiz
T1 - Shilnikov homoclinic orbit bifurcations in the Chua’s circuit
JF - Chaos : an interdisciplinary journal of nonlinear science
N2 - We analytically describe the complex scenario of homoclinic bifurcations in the Chua’s circuit. We obtain a general scaling law that gives the ratio between bifurcation parameters of different nearby homoclinic orbits. As an application of this theoretical approach, we estimate the number of higher order subsidiary homoclinic orbits that appear between two consecutive lower order subsidiary orbits. Our analytical finds might be valid for a large class of dynamical systems and are numerically confirmed in the parameter space of the Chua’s circuit.
Shilnikov homoclinic orbits are trajectories that depart from a fixed saddle-focus point, with specific eigenvalues, and return to it after an infinite amount of time (that is also true to time reversal evolution). That results in an orbit that is unstable and has an infinite period. These two main characteristics contribute in the hardness for its observation in a dynamical system as well as in nature. However, its presence reveals fundamental characteristics of the system involved, as the existence of unstable periodic orbits embedded in a chaotic set. Once the unstable periodic orbits give invariants quantities of this set,1 the Shilnikov homoclinic orbits are also related to the characteristics of the chaotic set. Their connection with the fundamental dynamical properties is verified in a wide variety of systems. A series of numerical and experimental investigations reveal how Shilnikov homoclinic orbits, in the vicinity of a chaotic attractor, determine its dynamical and topological properties.4 Thus, the Shilnikov orbits are related to the returning time of the trajectory of a CO2 laser,5 also to the topology of a glow-discharge system.6 Moreover, some class of spiking neurons are modeled by chaos governed by such orbits,7,8 and their presence are connected to the intermittence present in rabbit arteries.9 These orbits are shown to be behind the mechanism of noise-induced phenomena,10 and they are also responsible for the dynamics of an electrochemical oscillator.11 In this work, we contribute to the understanding of how Shilnikov homoclinic orbits appear on the parameter space of systems as the ones above mentioned, by showing that these orbits are not only distributed following an universal rule but also exist for large parameter variations. We then confirm our previsions in the Chua’s circuit system
Y1 - 2006
U6 - https://doi.org/10.1063/1.2401060
SN - 1054-1500
VL - 16
IS - 4
PB - American Institute of Physics
CY - Melville
ER -
TY - JOUR
A1 - Carroll, Susanne E.
T1 - Shallow processing : a consequence of bilingualism or second language learning?
Y1 - 2006
UR - http://journals.cambridge.org/jid_APS
U6 - https://doi.org/10.1017/S0142716406060061
SN - 0142-7164
ER -
TY - JOUR
A1 - Grobosch, Thomas
A1 - Mickler, Wulfhard
A1 - Feistel, Lothar
A1 - Schilde, Uwe
T1 - Separation of arsenic and other heavy metals with impregnated adsorber polymers : chapter 1: synthesis of the impregnation medium and separation of arsenic
Y1 - 2006
UR - http://www3.interscience.wiley.com/cgi-bin/jhome/60500203/
U6 - https://doi.org/10.1002/cite.200500170
SN - 0009-286X
ER -
TY - JOUR
A1 - Winterhalder, Matthias
A1 - Schelter, B
A1 - Kurths, Jürgen
A1 - Schulze-Borthage, A
A1 - Timmer, Jens
T1 - Sensitivity and specificity of coherence and phase synchronization analysis
N2 - In this Letter, we show that coherence and phase synchronization analysis are sensitive but not specific in detecting the correct class of underlying dynamics. We propose procedures to increase specificity and demonstrate the power of the approach by application to paradigmatic dynamic model systems. (c) 2006 Elsevier B.V. All rights reserved
Y1 - 2006
UR - http://www.sciencedirect.com/science/article/pii/S0375960106004002 ( 11.07.2011]
U6 - https://doi.org/10.1016/j.physleta.2006.03.018
ER -
TY - THES
A1 - Hohberger, Horst
T1 - Semiclassical asymptotics for the scattering amplitude in the presence of focal points at infinity
Y1 - 2006
CY - Potsdam
ER -
TY - THES
A1 - Hohberger, Horst
T1 - Semiclassical asymptotics for the scattering amplitude in the presence of focal points at infinity
T1 - Semiklassische Asymptotik der Streuamplitude bei unendlich fernen Fokalpunkten
N2 - We consider scattering in $\R^n$, $n\ge 2$, described by the Schr\"odinger operator $P(h)=-h^2\Delta+V$, where $V$ is a short-range potential. With the aid of Maslov theory, we give a geometrical formula for the semiclassical asymptotics as $h\to 0$ of the scattering amplitude $f(\omega_-,\omega_+;\lambda,h)$ $\omega_+\neq\omega_-$) which remains valid in the presence of focal points at infinity (caustics). Crucial for this analysis are precise estimates on the asymptotics of the classical phase trajectories and the relationship between caustics in euclidean phase space and caustics at infinity.
N2 - Wir betrachten Streuung in $\R^n$, $n\ge 2$, beschrieben durch den Schr\"odinger operator $P(h)=-h^2\Delta+V$, wo $V$ ein kurzreichweitiges Potential ist. Mit Hilfe von Maslov Theorie erhalten wir eine geometrische Formel fuer die semiklassische Asymptotik ($h\to 0$) der Streuamplitude $f(\omega_-,\omega_+;\lambda,h)$ ($\omega_+\neq\omega_-$) welche auch bei Vorhandensein von Fokalpunkten bei Unendlich (Kaustiken) gueltig bleibt.
KW - Mathematik
KW - Physik
KW - Streutheorie
KW - Streuamplitude
KW - Semiklassik
KW - mathematics
KW - physics
KW - scattering theory
KW - semiclassics
KW - scattering amplitude
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-11574
ER -
TY - JOUR
A1 - Kofod, Guggi
A1 - Paajanen, Mika
A1 - Bauer, Siegfried
T1 - Self-organized minimum-energy structures for dielectric elastomer actuators
Y1 - 2006
UR - http://www.springerlink.com/content/100501
U6 - https://doi.org/10.1007/s00339-006-3680-3
SN - 0947-8396
ER -
TY - JOUR
A1 - Torjek, Otto
A1 - Witucka-Wall, Hanna
A1 - Meyer, Rhonda C.
A1 - von Korff, Maria
A1 - Kusterer, Barbara
A1 - Rautengarten, Carsten
A1 - Altmann, Thomas
T1 - Segregation distortion in Arabidopsis C24/Col-0 and Col-0/C24 recombinant inbred line populations is due to reduced fertility caused by epistatic interaction of two loci
JF - Theoretical and applied genetics
N2 - A new large set of reciprocal recombinant inbred lines (RILs) was created between the Arabidopsis accessions Col-0 and C24 for quantitative trait mapping approaches, consisting of 209 Col-0 x C24 and 214 C24 x Col-0 F-7 RI lines. Genotyping was performed using 110 evenly distributed framework single nucleotide polymorphism markers, yielding a genetic map of 425.70 cM, with an average interval of 3.87 cM. Segregation distortion (SD) was observed in several genomic regions during the construction of the genetic map. Linkage disequilibrium analysis revealed an association between a distorted region at the bottom of chromosome V and a non-distorted region on chromosome IV. A detailed analysis of the RILs for these two regions showed that an SD occurred when homozygous Col-0 alleles on chromosome IV coincided with homozygous C24 alleles at the bottom of chromosome V. Using nearly isogenic lines segregating for the distorted region we confirmed that this genotypic composition leads to reduced fertility and fitness.
Y1 - 2006
U6 - https://doi.org/10.1007/s00122-006-0402-3
SN - 0040-5752
VL - 113
SP - 1551
EP - 1561
PB - Springer
CY - Berlin
ER -
TY - CHAP
A1 - Lücking, Andy
A1 - Rieser, Hannes
A1 - Staudacher, Marc
T1 - SDRT and multi-modal situated communication
N2 - Classical SDRT (Asher and Lascarides, 2003) discussed essential features of dialogue like adjacency pairs or corrections and up-dating. Recent work in SDRT (Asher, 2002, 2005) aims at the description of natural dialogue. We use this work to model situated communication, i.e. dialogue, in which sub-sentential utterances and gestures (pointing and grasping) are used as conventional modes of communication. We show that in addition to cognitive modelling in SDRT, capturing mental states and speech-act related goals, special postulates are needed to extract meaning out of contexts. Gestural meaning anchors Discourse Referents in contextually given domains. Both sorts of meaning are fused with the meaning of fragments to get at fully developed dialogue moves. This task accomplished, the standard SDRT machinery, tagged SDRSs, rhetorical relations, the up-date mechanism, and the Maximize Discourse Coherence constraint generate coherent structures. In sum, meanings from different verbal and non-verbal sources are assembled using extended SDRT to form coherent wholes.
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-10348
ER -
TY - CHAP
A1 - DeVault, David
A1 - Stone, Matthew
T1 - Scorekeeping in an uncertain language game
N2 - Received views of utterance context in pragmatic theory characterize the occurrent subjective states of interlocutors using notions like common knowledge or mutual belief. We argue that these views are not compatible with the uncertainty and robustness of context-dependence in humanhuman dialogue. We present an alternative characterization of utterance context as objective and normative. This view reconciles the need for uncertainty with received intuitions about coordination and meaning in context, and can directly inform computational approaches to dialogue.
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-10448
ER -
TY - GEN
A1 - Christmann, Olivia
A1 - Warlouzet, Laurent
T1 - Scenarios of "Europe-puissance" : the French foreign policy in Europe by 2020
N2 - Forum: EU-Diplomatie im Jahre 2020
KW - Europäische Verfassung
KW - Supermacht
KW - Politik
KW - Wirtschaft
KW - Regierungskooperation
KW - European Constitution
KW - superpower
KW - politics
KW - economy
KW - intergovernmental cooperation
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-48399
ER -
TY - CHAP
A1 - Rossmanith, Eva
A1 - Blaum, Niels
A1 - Keil, Manfred
A1 - Langerwisch, F.
A1 - Meyer, Jork
A1 - Popp, Alexander
A1 - Schmidt, Michael
A1 - Schultz, Christoph
A1 - Schwager, Monika
A1 - Vogel, Melanie
A1 - Wasiolka, Bernd
A1 - Jeltsch, Florian
T1 - Scaling up local population dynamics to regional scales
BT - an integrated approach
N2 - In semi-arid savannas, unsustainable land use can lead to degradation of entire landscapes, e.g. in the form of shrub encroachment. This leads to habitat loss and is assumed to reduce species diversity. In BIOTA phase 1, we investigated the effects of land use on population dynamics on farm scale. In phase 2 we scale up to consider the whole regional landscape consisting of a diverse mosaic of farms with different historic and present land use intensities. This mosaic creates a heterogeneous, dynamic pattern of structural diversity at a large spatial scale. Understanding how the region-wide dynamic land use pattern affects the abundance of animal and plant species requires the integration of processes on large as well as on small spatial scales. In our multidisciplinary approach, we integrate information from remote sensing, genetic and ecological field studies as well as small scale process models in a dynamic region-wide simulation tool.
Interdisziplinäres Zentrum für Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006.
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7320
N1 - [Poster]
ER -
TY - JOUR
A1 - Haußig, Hans-Michael
T1 - Roy, A., Marriage Customs and Ceremonies in World Religions; Victory B.C., Trafford, 2005
BT - Marriage Customs and Ceremonies in World Religions
Y1 - 2006
SN - 0948-0471
ER -
TY - JOUR
A1 - Stepanov, Arthur
T1 - Robert Frank: Phrase structure composition and syntactic dependencies / rezensiert von Arthur Stepanov
JF - Lingua : international review of general linguistics
N2 - Rezensiertes Werk:
Frank, Robert: Phrase Structure Composition and Syntactic Dependencies. - Cambridge, MA : MIT Press, 2002. - xiv + 326 S.
Y1 - 2006
U6 - https://doi.org/10.1016/j.lingua.2005.06.002
SN - 0024-3841
VL - 116
IS - 12
SP - 2259
EP - 2272
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Schlör, Joachim
T1 - Road, path, panorama : travel ways and landscape variations from 1930 to 1990
Y1 - 2006
SN - 0149-7952
ER -
TY - JOUR
A1 - Schmidt, Bernd
A1 - Hermanns, Jolanda
T1 - Ring closing metathesis of substrates containing more than two C-C-double bonds : rapid access to functionalized heterocycles
N2 - In most cases where ring closing metathesis is applied to the synthesis of heterocycles, alpha,omega-dienes are used as precursors. If substrates containing more than two double bonds are subjected to a metathesis reaction, carba- or heterocycles bearing additional exocyclic alkene functionality result, or multiple ring closing processes occur. This offers interesting and potentially very useful synthetic perspectives. On the other hand, selectivity problems need to be addressed as the cyclization of substrates with more than two double bonds available for olefin metathesis may result in constitutional isomers or stereoisomers. This review highlights problems and opportunities evolving from ring closing metathesis of tri-, tetra-, and polyenes as a strategy for the selective synthesis of functionalized heterocycles. The chapter on RCM of trienes is subdivided according to the symmetry of the metathesis precursor. The following two chapters deal with the double or multiple RCM of tetra- or polyenes. These processes are further classified according to the preferred cyclization mode. Finally, the application of cascade or domino metathesis reactions to the synthesis of heterocycles will be discussed. These processes can be classified into those where exclusively C-C-double bonds take part in the metathesis reaction, and those where one or more C-C-triple bonds are involved
Y1 - 2006
ER -
TY - JOUR
A1 - Landa, Polina S.
A1 - Ushakov, Vladimir
A1 - Kurths, Jürgen
T1 - Rigorous theory of stochastic resonance in overdamped bistable oscillators for weak signals
JF - Chaos, solitons & fractals : applications in science and engineering
N2 - The results of the theoretical consideration of stochastic resonance in overdamped bistable oscillators are given. These results are founded not on the model of two states as in [McNamara B, Wiesenfeld K. Theory of stochastic resonance. Phys Rev A 1989;39:4854-69], but on splitting of motion into regular and random and the rigorous solution of the Fokker-Planck equation for the random component. We show that this resonance is caused by a change, under the influence of noise, of the system's effective stiffness and damping factor contained in the equation for the regular component. For a certain value of the noise intensity the effective stiffness is minimal, and this fact causes non-monotonic change of the output signal amplitude as the noise intensity changes. It is important that the location of the minimum and its value depend essentially on the signal frequency.
Y1 - 2006
UR - http://www.sciencedirect.com/science/journal/09600779
U6 - https://doi.org/10.1016/j.chaos.2005.08.116
SN - 0960-0779
VL - 30
IS - 3
SP - 574
EP - 578
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Neumann, Meina
A1 - Schulte, Marc
A1 - Jünemann, Nora
A1 - Stöcklein, Walter F. M.
A1 - Leimkühler, Silke
T1 - Rhodobacter capsulatus XdhC is involved in molybdenum cofactor binding and insertion into xanthine dehydrogenase
N2 - Rhodobacter capsulatus xanthine dehydrogenase (XDH) is a cytoplasmic enzyme with an (alpha beta) 2 heterodimeric structure that is highly identical to homodimeric eukaryotic xanthine oxidoreductases. The crystal structure revealed that the molybdenum cofactor (Moco) is deeply buried within the protein. A protein involved in Moco insertion and XDH maturation has been identified, which was designated XdhC. XdhC was shown to be essential for the production of active XDH but is not a subunit of the purified enzyme. Here we describe the purification of XdhC and the detailed characterization of its role for XDH maturation. We could show that XdhC binds Moco in stoichiometric amounts, which subsequently can be inserted into Moco-free apo-XDH. A specific interaction between XdhC and XdhB was identified. We show that XdhC is required for the stabilization of the sulfurated form of Moco present in enzymes of the xanthine oxidase family. Our findings imply that enzyme-specific proteins exist for the biogenesis of molybdoenzymes, coordinating Moco binding and insertion into their respective target proteins. So far, the requirement of such proteins for molybdoenzyme maturation has been described only for prokaryotes
Y1 - 2006
UR - http://www.jbc.org/
U6 - https://doi.org/10.1074/jbc.M601617200
ER -
TY - BOOK
A1 - Reilich, Julia
T1 - Return to schooling in Germany
N2 - This paper tries to apply common methods to estimate unbiased coefficients for the return to schooling in Germany for the year 2004. Based on the simple Mincer-type wage equation, the return to schooling is around 9.5% per year. There is no sheepskin effect. As expected the return in the private sector is higher than in the public sector. Females have a higher return than males, but there are no differences between East and West Germans. An Instrumental Variables and a 3-Stage-Least-Squares approach give very high returns. For correcting the sample selection, the Heckman Two Step Procedure and the Heckman Maximum Likelihood Approach are used. For both methods, the coefficients are very similar, but higher than without correcting for it.
T3 - Statistische Diskussionsbeiträge - 24
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12175
ER -
TY - THES
A1 - Rößler, Dirk
T1 - Retrieval of earthquake source parameters in inhomogeneous anisotropic mediawith application to swarm events in West Bohemia in 2000
T1 - Bestimmung von Erdbebenparametern in inhomogenen anisotropen Medien mit Anwendung auf Schwarmbeben im Vogtland im Jahr 2000
N2 - Earthquakes form by sudden brittle failure of rock mostly as shear ruptures along a rupture plane. Beside this, mechanisms other than pure shearing have been observed for some earthquakes mainly in volcanic areas. Possible explanations include complex rupture geometries and tensile earthquakes. Tensile earthquakes occur by opening or closure of cracks during rupturing. They are likely to be often connected with fluids that cause pressure changes in the pore space of rocks leading to earthquake triggering. Tensile components have been reported for swarm earthquakes in West Bohemia in 2000. The aim and subject of this work is an assessment and the accurate determination of such tensile components for earthquakes in anisotropic media. Currently used standard techniques for the retrieval of earthquake source mechanisms assume isotropic rock properties. By means of moment tensors, equivalent forces acting at the source are used to explain the radiated wavefield. Conversely, seismic anisotropy, i.e. directional dependence of elastic properties, has been observed in the earth's crust and mantle such as in West Bohemia. In comparison to isotropy, anisotropy causes modifications in wave amplitudes and shear-wave splitting. In this work, effects of seismic anisotropy on true or apparent tensile source components of earthquakes are investigated. In addition, earthquake source parameters are determined considering anisotropy. It is shown that moment tensors and radiation patterns due to shear sources in anisotropic media may be similar to those of tensile sources in isotropic media. In contrast, similarities between tensile earthquakes in anisotropic rocks and shear sources in isotropic media may exist. As a consequence, the interpretation of tensile source components is ambiguous. The effects that are due to anisotropy depend on the orientation of the earthquake source and the degree of anisotropy. The moment of an earthquake is also influenced by anisotropy. The orientation of fault planes can be reliably determined even if isotropy instead of anisotropy is assumed and if the spectra of the compressional waves are used. Greater difficulties may arise when the spectra of split shear waves are additionally included. Retrieved moment tensors show systematic artefacts. Observed tensile source components determined for events in West Bohemia in 1997 can only partly be attributed to the effects of moderate anisotropy. Furthermore, moment tensors determined earlier for earthquakes induced at the German Continental Deep Drilling Program (KTB), Bavaria, were reinterpreted under assumptions of anisotropic rock properties near the borehole. The events can be consistently identified as shear sources, although their moment tensors comprise tensile components that are considered to be apparent. These results emphasise the necessity to consider anisotropy to uniquely determine tensile source parameters. Therefore, a new inversion algorithm has been developed, tested, and successfully applied to 112 earthquakes that occurred during the most recent intense swarm episode in West Bohemia in 2000 at the German-Czech border. Their source mechanisms have been retrieved using isotropic and anisotropic velocity models. Determined local magnitudes are in the range between 1.6 and 3.2. Fault-plane solutions are similar to each other and characterised by left-lateral faulting on steeply dipping, roughly North-South oriented rupture planes. Their dip angles decrease above a depth of about 8.4km. Tensile source components indicating positive volume changes are found for more than 60% of the considered earthquakes. Their size depends on source time and location. They are significant at the beginning of the swarm and at depths below 8.4km but they decrease in importance later in the course of the swarm. Determined principle stress axes include P axes striking Northeast and Taxes striking Southeast. They resemble those found earlier in Central Europe. However, depth-dependence in plunge is observed. Plunge angles of the P axes decrease gradually from 50° towards shallow angles with increasing depth. In contrast, the plunge angles of the T axes change rapidly from about 8° above a depth of 8.4km to 21° below this depth. By this thesis, spatial and temporal variations in tensile source components and stress conditions have been reported for the first time for swarm earthquakes in West Bohemia in 2000. They also persist, when anisotropy is assumed and can be explained by intrusion of fluids into the opened cracks during tensile faulting.
N2 - Erdbeben entstehen durch plötzlichen Sprödbruch des Gesteins, meist als Scherbruch entlang einer Bruchfläche. Daneben werden für einige Beben v.a. in vulkanischen Gebieten auch Mechanismen beobachtet, die scheinbar vom Modell des Scherbruches abweichen. Ursachen dafür beinhalten komplexe Bruchgeometrien und tensile Erdbeben. Bei tensilen Erdbeben kommt es während des Bruchs zum Öffnen oder Schließen der Bruchfläche und damit zu Volumenänderungen. Erdbeben mit tensilen Anteilen stehen wahrscheinlich oft im Zusammenhang mit Fluiden, welche zur Durckänderung im Porenraum von Gesteinen und damit zum Auslösen des Bebens führen. Sie wurden auch im Vogtland während eines Erdbebenschwarms im Jahr 1997 beobachtet. Die Beurteilung und sichere Bestimmung tensiler Anteile von Erdbeben sind Ziel und Gegenstand dieser Arbeit. Bei Standardverfahren zur Bestimmung von Erdbebenmechanismen werden isotrope Gesteinseigenschaften angenommen. Momententensoren beschreiben dabei Kräfte, die das abgestrahlte Wellenfeld erklären. Allerdings wird seismische Anisotropie, d.h. Richtungsabhängigkeit elastischer Eigenschaften, in der Erdkruste und im Mantel wie z.B. im Vogtland beobachtet. Anisotropie bewirkt im Vergleich zu isotropen Medien Veränderungen der Wellenamplituden und -polariserungen sowie das Aufspalten von Scherwellen. In der vorliegenden Arbeit werden daher der Einfluss seismischer Anisotropie auf wahre oder scheinbar auftretende tensile Quellanteile untersucht und Erdbebenmechanismen unter Berücksichtigung seismischer Anisotropie bestimmt. Es wird gezeigt, dass Momententensoren und Abstrahlmuster von Scherbrüchen in anisotropen Medien denen von tensilen Brüchen in isotropen Medien ähneln können. Umgekehrt treten Ähnlichkeiten tensiler Beben in anisotropen Gesteinen mit Scherbrüchen in isotropen Medien auf. Damit existieren Mehrdeutigkeiten beobachteter tensiler Quellanteile. Die Effekte von Anisotropie hängen von der Orientierung des Bruches und vom Grad der Anisotropie ab. Außerdem beeinflusst Anisotropie das Moment eines Bebens. Herdflächenorientierungen können auch dann verlässlich bestimmt werden, wenn man Isotropie statt Anisotropie annimmt und die Spektren von Kompressionswellen verwendet. Bei Hinzunahme der Spektren von Scherwellen können Uneindeutigkeiten auftreten. Abgeleitete Momententensoren zeigen systematische Artefakte. Beobachtungen tensiler Quellanteile von Beben im Vogtland im Jahr 1997 können nicht allein durch moderate Anisotropie erklärt werden. Weiterhin wurden früher bestimmte Momententensoren induzierter Beben nahe der Kontinentalen Tiefbohrung, Bayern, unter Annahme anisotroper Parameter reinterpretiert. Die Beben werden einheitlich als Scherbrüche charakterisiert, obwohl deren Momententensoren tensile Bestandteile enthalten, die als scheinbar angesehen werden. Die Resultate unterstreichen die Notwendigkeit, seismische Anisotropie zu berücksichtigen, um tensile Komponenten von Erdbeben eindeutig zu bestimmen. Ein daher neu entwickelter Inversionsalgorithmus wurde getestet und erfolgreich auf 112 Erdbeben der letzten intensiven Schwarmepisode im Jahr 2000 im Vogtland an der deutsch-tschechischen Grenze angewandt. Die Herdparameter wurden unter Verwendung isotroper und anisotroper Geschwindigkeitsmodelle ermittelt. Die Beben zeigen Lokalmagnituden zwischen 1,6 und 3,2. Sie weisen zueinander ähnliche Herdflächenlösungen mit linkslateralem Versatz auf steil einfallenden, etwa Nord-Süd orientierten Bruchflächen auf. Die Fallwinkel nehmen oberhalb 8,4km Tiefe ab. Für über 60% der betrachteten Erdbeben werden tensile Quellanteile mit Volumenvergrößerung beobachtet. Die tensilen Komponenten zeigen Abhängigkeiten von Herdzeit und -ort. Sie sind zu Beginn des Schwarms sowie in Tiefen unterhalb 8,4km besonders signifikant und nehmen später an Bedeutung ab. Abgeleitete Hauptspannungsachsen enthalten P Achsen mit nordwestlicher und T Achsen mit südwestlicher Streichrichtung. Sie ähneln denen in Mitteleuropa. Es werden tiefenabhängige Fallwinkel beobachtet. Die Änderungen erfolgen für die P Achsen graduell von 50° hin zu flacheren Fallwinkeln bei tieferen Beben. Sie erfolgen jedoch abrupt für die T Achsen von etwa 8° oberhalb einer Tiefe von etwa 8,4km zu 21° einfallend unterhalb dessen. Mit dieser Arbeit werden erstmals zeitliche und räumliche Veränderungen tensiler Quellanteile und Spannungszustände im Vogtland für Erdbeben im Jahr 2000 beobachtet. Diese haben auch dann Bestand, wenn seismische Anisotropie berücksichtigt wird. Sie können durch Fluide erklärt werden, die in die Bruchflächen eindringen.
KW - Seismologie
KW - Momententensor
KW - Anisotropie
KW - Erdbeben
KW - Wellenausbreitung
KW - Vogtland
KW - Schwarmbeben
KW - tensile Anteile
KW - Hauptspannungsachse
KW - earthquake swarm
KW - anisotropy
KW - tensile earthquakes
KW - moment tensor
KW - West Bohemia
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7758
ER -
TY - JOUR
A1 - Willig, Andreas
A1 - Mitschke, Robert
T1 - Results of bit error measurements with sensor nodes and casuistic consequences for design of energy-efficient error control schemes
N2 - For the proper design of energy-efficient error control schemes some insight into channel error patterns is needed. This paper presents bit error and packet loss measurements taken with sensor nodes running the popular RFM
Y1 - 2006
SN - 978-3-540-32158-3
ER -
TY - JOUR
A1 - Williams, Malcolm
T1 - Response to Erich Poppe’s Contribution on “Celtic influence on English relative clauses?”
JF - The Celtic Englishes IV : the interface between English and the Celtic languages ; proceedings of the fourth international colloquium on the "Celtic Englishes" held at the University of Potsdam in Golm (Germany) from 22-26 September 2004
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-41001
SP - 212
EP - 216
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Poschadel, Jens R.
A1 - Meyer-Lucht, Yvonne
A1 - Plath, Martin
T1 - Response to chemical cues from conspecifics reflects male mating preference for large females and avoidance of large competitors in the European pond turtle, Emys orbicularis
N2 - We examined chemical communication in male and female European pond turtles (Emys orbicularis). In simultaneous binary choice tests, a focal animal was given a choice between pheromones from a conspecific and a choice chamber containing untreated water. Females did not show a preference, both when male and when female stimuli were presented. On the contrary, males preferred the odor of a female over untreated water, suggesting that males actively search for females. The strength of preference was positively correlated with the body size difference between the female and the focal male, indicating that males prefer to mate with larger females. Female fecundity is positively correlated with female size in E. orbicularis, which may account for male choosiness. No overall preference for the stimulus animal was observed when males were presented cues from another male. However, the strength of preference was negatively correlated with the difference in body size. Males avoided large males, but oriented towards smaller stimulus males. This reflects that males form dominance hierarchies, where large males aggressively attack smaller ones. Far-range chemical communication probably enables males to minimize the risk of costly aggressive interactions. This is, to our knowledge, the first study on the role of chemical cues for inter-and intrasexual communication in the European pond turtle
Y1 - 2006
UR - http://www.bibliothek.uni-regensburg.de/ezeit/?2007939
U6 - https://doi.org/10.1163/156853906776759510
SN - 0005-7959
ER -
TY - JOUR
A1 - Gil, Juan B.
A1 - Krainer, Thomas
A1 - Mendoza, Gerardo A.
T1 - Resolvents of elliptic cone operators
JF - Journal of functional analysis
N2 - We prove the existence of sectors of minimal growth for general closed extensions of elliptic cone operators under natural ellipticity conditions. This is achieved by the construction of a suitable parametrix and reduction to the boundary. Special attention is devoted to the clarification of the analytic structure of the resolvent.
KW - resolvents
KW - manifolds with conical singularities
KW - spectral theory
KW - parametrices
KW - boundary value problems
Y1 - 2006
U6 - https://doi.org/10.1016/j.jfa.2006.07.010
SN - 0022-1236
VL - 241
IS - 1
SP - 1
EP - 55
PB - Elsevier
CY - San Diego
ER -
TY - JOUR
A1 - Müller, C.
A1 - Weber, Edzard
A1 - Gronau, Norbert
T1 - Requirements for an integration of methods analyzing social issues in knowledge organizations
Y1 - 2006
ER -
TY - BOOK
ED - Hummel, Detlev
ED - Remde, Jörg
ED - Fliege, Felix
T1 - Reports of the 2nd German-Russian PhD Seminar : from 10th to 13th of October 2005 in Potsdam
T3 - Diskussionsbeiträge / Universität Potsdam, Wirtschafts- und Sozialwissenschaftliche Fakultät
Y1 - 2006
SN - 1433-1039
PB - Univ.
CY - Potsdam
ER -
TY - JOUR
A1 - Gessner, Jörn
A1 - Arndt, Gerd-Michael
A1 - Tiedemann, Ralph
A1 - Bartel, Ryszard
A1 - Kirschbaum, Frank
T1 - Remediation measures for the Baltic sturgeon: status review and perspectives
JF - Journal of applied ichthyology
N2 - More than one century ago, sturgeons were prevalent species in the fish communities of all major German rivers both in the North and the Baltic seas drainages. Since then, the populations declined rapidly due to river damming, overfishing and pollution. The last sturgeon catches in the Baltic drainage system occurred during the late 1960ies. Only a few individual captures have been reported during the last 30 years with the most recent records in the Lake Ladoga ( Russia), where the last confirmed catch was recorded in 1984, and a single individual caught off Estonia in 1996. Today, sturgeons are considered missing or extinct in German waters. First attempts for remediation of the species were undertaken in the mid 1990ies. Subsequently, phylogenetic and population genetic analyses of the species were carried out using mtDNA, microsatellites, and nuclear markers ( SNPs). These genetic analyses using recent and historic material have proven the existence of two different species in the Baltic Sea in what was previously considered to represent the European Atlantic sturgeon only. In the Baltic Sea, the American Atlantic sturgeon ( A. oxyrinchus) succeeded to colonize this brackish water system during the Middle Ages. In the North Sea, the European Atlantic sturgeon ( A. sturio) is considered to be the endemic species. These results led to the separation of the remediation activities in the North Sea and the Baltic Sea tributaries. Further studies on the mechanism that lead to the extinction of A. sturio in Germany and the subsequent succession of the A. oxyrinchus mtDNA haplotype are currently been carried out. Broodstock development using the northernmost populations of A. oxyrinchus is currently under way. As a further prerequisite to re-introduce this species into the Baltic, the evaluation of the status of critical habitats for the early life stages of the American Atlantic sturgeon in the River Odra has been performed in collaboration with the Institute for Inland Fisheries of Poland. Alternative fisheries techniques, based on the data of by-catch of exotic sturgeons in the fishery, are presently developed in close cooperation with the fishery to reduce fisheries related mortality in juvenile sturgeons upon release. Monitoring of habitat utilization and migration characteristics of juvenile fish upon experimental release will have to be carried out shortly, using acoustic telemetry, with the aim to follow the fate of the released fish and to determine the best time-size-release-window for future release programmes.
Y1 - 2007
U6 - https://doi.org/10.1111/j.1439-0426.2007.00925.x
SN - 0175-8659
VL - 22
IS - S1
SP - 23
EP - 31
PB - Wiley-Blackwell
CY - Oxford
ER -
TY - JOUR
A1 - Mac Mathúna, Séamus
T1 - Remarks on standardisation in irish English, Irish and Welsh
JF - The Celtic Englishes IV : the interface between English and the Celtic languages ; proceedings of the fourth international colloquium on the "Celtic Englishes" held at the University of Potsdam in Golm (Germany) from 22-26 September 2004
N2 - Content: 1. Introduction 2. Standardisation and Celticity 3. Standardisation in Irish and Other Celtic Languages 4. Borrowing and Code-Switching 5. Conclusion
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-40950
SP - 114
EP - 129
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Frübing, Peter
A1 - Kremmer, Alexander
A1 - Gerhard, Reimund
A1 - Spanoudaki, Anna
A1 - Pissis, Polycarpos
T1 - Relaxation processes at the glass transition in polyamide 11: From rigidity to viscoelasticity
JF - The journal of chemical physics : bridges a gap between journals of physics and journals of chemistr
N2 - Relaxation processes associated with the glass transition in nonferroelectric and ferroelectric polyamide (PA) 11 are investigated by means of differential scanning calorimetry, dynamic mechanical analysis, and dielectric relaxation spectroscopy (DRS) in order to obtain information about the molecular mobility within the amorphous phase. In particular, the effects of melt quenching, cold drawing, and annealing just below the melting region are studied with respect to potential possibilities and limitations for improving the piezoelectric and pyroelectric properties of PA 11. A relaxation map is obtained from DRS that shows especially the crossover region where the cooperative alpha relaxation and the local beta relaxation merge into a single high-temperature process. No fundamental difference between quenched, cold-drawn, and annealed films is found, though in the cold-drawn (ferroelectric) film the alpha relaxation is suppressed and slowed down, but it is at least partly recovered by subsequent annealing. It is concluded that there exists an amorphous phase in all structures, even in the cold-drawn film. The amorphous phase can be more rigid or more viscoelastic depending on preparation. Cold drawing not only leads to crystallization in a ferroelectric form but also to higher rigidity of the remaining amorphous phase. Annealing just below the melting region after cold drawing causes a stronger phase separation between the crystalline phase and a more viscoelastic amorphous phase.
Y1 - 2006
U6 - https://doi.org/10.1063/1.2360266
SN - 0021-9606
VL - 125
IS - 12
PB - American Institute of Physics
CY - Melville
ER -
TY - JOUR
A1 - Frübing, Peter
A1 - Kremmer, Alexander
A1 - Gerhard, Reimund
A1 - Spannoudaki, Anna
A1 - Pissis, Polycarpos
T1 - Relaxation processes at the glass transition in polyamide 11 : From rigidity to viscoelasticity
Y1 - 2006
UR - http://jcp.aip.org/
U6 - https://doi.org/10.1063/1.2360266
SN - 0021-9606
ER -
TY - JOUR
A1 - Baas, Timo
A1 - Schrooten, Mechthild
T1 - Relationship banking and SMEs: A theoretical analysis
JF - Small business economics : an international journal
N2 - Reliable information on small- and medium-sized enterprises (SMEs) is rare and costly for financial intermediaries. Therefore relationship banking is often considered as the appropriate lending technique. In this paper we offer a theoretical model to analyze relationship banking and the pricing behavior of banks in a Bertrand competition framework with monitoring costs. We show that the lack of reliable information leads to comparable high interest rates even if a long-term relationship between borrower and bank exists. The paper offers a theoretical explanation why SMEs often are faced with borrowing constraints.
KW - accounting
KW - financial constraints
KW - relationship banking
KW - small and medium sized enterprises
Y1 - 2006
U6 - https://doi.org/10.1007/s11187-006-0018-7
SN - 0921-898X
VL - 27
SP - 127
EP - 137
PB - Springer
CY - Dordrecht
ER -
TY - JOUR
A1 - Stepan, H
A1 - Faber, R
A1 - Wessel, Niels
A1 - Wallukat, Gerd
A1 - Schultheiss, H. P.
A1 - Walther, T
T1 - Relation between circulating angiotensin II type 1 receptor agonistic autoantibodies and soluble fms-like tyrosine kinase 1 in the pathogenesis of preeclampsia
N2 - Context: Placental and circulatory soluble fms-like tyrosine kinase 1 (sFlt1) has proven to be elevated in pregnant women with preeclampsia, a disease characterized by hypertension, proteinuria, and endothelial dysfunction. Recent studies also demonstrated an autoantibody against the angiotensin II type 1 (AT1) receptor (AT1-AA) in that disease. Objective: Both factors are discussed as key players in the etiology of preeclampsia. However, it has not yet been clarified whether these two circulating factors correlate and whether synergy determines the severity of pathology. Design: AT1-AA was retrospectively determined by a bioassay and sFlt1 by an ELISA. Patients: Serum from second-trimester pregnancies with normal or abnormal uterine perfusion and in women at term with or without pregnancy pathology was analyzed. Results: Most of the preeclamptic patients were characterized by high sFlt1 levels and the presence of AT1-AA, although the agonistic effects of the antibody did not correlate with the sFlt1 concentrations (P = 0.85). Although AT1- AA was also detected in second-trimester pregnancies evidencing abnormal uterine perfusion without later pathology, sFlt1 was not significantly elevated in these pregnancies, compared with those with normal uterine perfusion. However, whereas women with abnormal perfusion and later pregnancy pathology did not differ in AT1-AA, compared with those with normal outcome, sFlt1 was significantly increased. Again, the two factors did not correlate (P = 0.15). Conclusions: We conclude that AT1-AA bioactivity and sFlt1 concentrations do not correlate, are not mutually dependent, and are thus probably involved in distinct pathogenetic mechanisms. Both factors in combination may not be causative for the early impaired trophoblast invasion and pathological uterine perfusion
Y1 - 2006
UR - http://jcem.endojournals.org/content/91/6/2424.full
U6 - https://doi.org/10.1210/Jc.2005-2698
ER -
TY - JOUR
A1 - Ruhl, R.
A1 - Fritzsche, Britta
A1 - Vermot, J.
A1 - Niederreither, K.
A1 - Neumann, U.
A1 - Schmidt, A.
A1 - Schweigert, Florian J.
A1 - Dolle, P.
T1 - Regulation of expression of the retinoic acid-synthesising enzymes retinaldehyde dehydrogenases in the uteri of ovariectomised mice after treatment with oestrogen, gestagen and their combination
N2 - The active metabolite of vitaminA, retinoic acid (RA), plays an important role in the female reproductive system. The synthesis of RA is tightly regulated by the activity of retinaldehyde dehydrogenases (Raldh). Among these, Raldh1 and Raldh2 exhibit specific temporal and spatial expression patterns in the mouse uterus, both during the oestrous cycle and early pregnancy. In the present study, we have assessed whether oestradiol and progesterone directly influence the uterine expression of Raldh1 and Raldh2 in ovariectomised mice. We investigated the effect of gestagen (promegestone 0.3 mg kg(-1) bodyweight), oestrogen (oestradiol 3 mu g kg(-1) bodyweight) and their combination on the uterine expression of Raldh2. Expression was analysed using in situ hybridisation and quantified using real-time detection reverse transcription-polymerase chain reaction. The results show that the expression of Raldh2 is rapidly (within 1-4 h) induced in stromal cells by oestrogen, but not by gestagen, treatment, whereas combined oestrogen + gestagen treatment leads to a more prolonged (48 h) response. In contrast, oestrogen, but not progesterone, treatment downregulates (within 4 - 24 h) Raldh1 expression in the uterine glandular epithelium. We conclude that the uterine RA concentrations are regulated by oestrogens via an effect on the expression of the Raldh synthesising enzymes. Such a regulation is consistent with the natural fluctuations of Raldh expression during the oestrous cycle, early pregnancy and blastocyst implantation
Y1 - 2006
ER -
TY - JOUR
A1 - John, Cedric Michael
A1 - Adatte, Thierry
A1 - Mutti, Maria
T1 - Regional trends in clay mineral fluxes to the Queensland margin and ties to middle Miocene global cooling
N2 - Three ODP sites located on the Marion Plateau, Northeast Australian margin, were investigated for clay mineral and bulk mineralogy changes through the early to middle Miocene. Kaolinite to smectite (K/S) ratios, as well as mass accumulation rates of clays, point to a marked decrease in accumulation of smectite associated with an increase in accumulation of kaolinite starting at similar to 15.6 Ma, followed by a, second increase in accumulation of kaolinite at similar to 13.2 Ma. Both of these increases are correlative to an increase in the calcite to detritus ratio. Comparison of our record with published precipitation proxies from continental Queensland indicates that increases in kaolinite did not correspond to more intense tropical-humid conditions, but instead to periods of greater aridity. Three mechanisms are explored to explain the temporal trends in clad, on the Marion Plateau: sea-level changes, changes in oceanic currents, and denudation of the Australian continent followed by reworking and eolian transport of clays. Though low mass accumulation rates of kaolinite are compatible with a possible contribution of eolian material after 14 Ma, when Australia became more arid, the lateral distribution of kaolinite along slope indicates mainly fluvial input for all clays and thus rules out this mechanism as well as oceanic current transport as the main controls behind clay accumulation on the plateau. We propose a model explaining the good correlation between long-term sea-level fall, decrease in smectite accumulation, increase in kaolinite accumulation and increase in carbonate input to the distal slope locations. We hypothesize that during low sea level and thus periods of drier continental climate in Queensland, early Miocene kaolinite-rich lacustrine deposits were being reworked, and that the progradation of the heterozoan carbonate platforms towards the basin center favored input of carbonate to the distal slope sites. The major find of our study is that increase kaolinite fluxes on the Queensland margin during the early and middle Miocene did not reflect the establishment of a tropical climate, and this stresses that care must be taken when reconstructing Australian climate based on deep-sea clay records alone.
Y1 - 2006
UR - http://www.sciencedirect.com/science/journal/00310182
U6 - https://doi.org/10.1016/j.palaeo.2005.09.010
SN - 0031-0182
ER -
TY - JOUR
A1 - Lange, Claudia
T1 - Reflexivity and intensification in Irish English and other new Englishes
JF - The Celtic Englishes IV : the interface between English and the Celtic languages ; proceedings of the fourth international colloquium on the "Celtic Englishes" held at the University of Potsdam in Golm (Germany) from 22-26 September 2004
N2 - Content: 1. Celtic Syntax in English and the European Sprachbund 2. Unpredictable Self-forms across Varieties of English 2.2. The Development of himself 2.3. Itself in Irish and Indian English 3. Concluding Remarks
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-41031
SP - 259
EP - 282
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Riesch, Rüdiger
A1 - Schlupp, Ingo
A1 - Tobler, Michael
A1 - Plath, Martin
T1 - Reduction of the association preference for conspecifics in cave-dwelling Atlantic mollies, Poecilia mexicana
JF - Behavioral ecology and sociobiology
N2 - Cave animals are widely recognised as model organisms to study regressive evolutionary processes like the reduction of eyes. In this paper, we report on the regressive evolution of species discrimination in the cave molly, Poecilia mexicana, which, unlike other cave fishes, still has functional eyes. This allowed us to examine the response to both visual and non-visual cues involved in species discrimination. When surface-dwelling females were given a chance to associate with either a conspecific or a swordtail (Xiphophorus hellerii) female, they strongly preferred the conspecific female both when multiple cues and when solely visual cues were available to the female. No association preference was observed when only non-visual cues were provided. In contrast, cave-dwelling females showed no preference under all testing conditions, suggesting that species recognition mechanisms have been reduced. We discuss the role of species discrimination in relation to habitat differences.
KW - cave fish
KW - Poeciliidae
KW - Xiphophorus
KW - shoaling
KW - species recognition
Y1 - 2006
U6 - https://doi.org/10.1007/s00265-006-0223-z
SN - 0340-5443
VL - 60
SP - 794
EP - 802
PB - Springer
CY - New York
ER -
TY - JOUR
A1 - Kreft, Oliver
A1 - Georgieva, Radostina
A1 - Bäumler, Hans
A1 - Steup, Martin
A1 - Müller-Röber, Bernd
A1 - Sukhorukov, Gleb B.
A1 - Möhwald, Helmuth
T1 - Red blood cell templated polyelectrolyte capsules : a novel vehicle for the stable encapsulation of DNA and proteins
N2 - A novel method for the encapsulation of biomacromolecules, such as nucleic acids and proteins, into polyelectrolyte microcapsules is described. Fluorescence-labelled double-stranded DNA and human serum albumin (HSA) are used as model substances for encapsulation in hollow microcapsules templated on human erythrocytes. The encapsulation procedure involves an intermediate drying C, step. The accumulation of DNA and HSA in the capsules is observed by confocal laser scanning microscopy, UV spectroscopy, and flourimetry. The mechanism of encapsulation is discussed
Y1 - 2006
UR - http://www3.interscience.wiley.com/cgi-bin/jhome/10003270
U6 - https://doi.org/10.1002/marc.200500777
SN - 1022-1336
ER -
TY - JOUR
A1 - Assmann, Birte
A1 - Thiel, Marco
A1 - Romano, Maria Carmen
A1 - Niemitz, Carsten
T1 - Recurrence plot analyses suggest a novel reference system involved in newborn spontaneous movements
JF - Behavior research methods : a journal of the Psychonomic Society
N2 - The movements of newborns have been thoroughly studied in terms of reflexes, muscle synergies, leg coordination, and target-directed arm/hand movements. Since these approaches have concentrated mainly on separate accomplishments, there has remained a clear need for more integrated investigations. Here, we report an inquiry in which we explicitly concentrated on taking such a perspective and, additionally, were guided by the methodological concept of home base behavior, which Ilan Golard developed for studies of exploratory behavior in animals. Methods from nonlinear dynamics, such as symbolic dynamics and recurrence plot analyses of kinematic data received from audiovisual newborn recordings, yielded new insights into the spatial and temporal organization of limb movements. In the framework of home base behavior, our approach uncovered a novel reference system of spontaneous newborn movements.
Y1 - 2006
U6 - https://doi.org/10.3758/BF03192793
SN - 1554-351X
SN - 1554-3528
VL - 38
IS - 3
SP - 400
EP - 406
PB - Springer
CY - New York
ER -
TY - JOUR
A1 - Oberauer, Klaus
T1 - Reasoning with conditionals: A test of formal models of four theories
JF - Cognitive psychology
N2 - The four dominant theories of reasoning from conditionals are translated into formal models: The theory of mental models (Johnson-Laird, P. N., & Byrne, R. M. J. (2002). Conditionals: a theory of meaning, pragmatics, and inference. Psychological Review, 109, 646-678), the suppositional theory (Evans, J. S. B. T., & Over, D. E. (2004). If. Oxford: Oxford University Press), a dual-process variant of the model theory (Verschueren, N., Schaeken, W., & d'Ydewalle, G. (2005). A dual-process specification of causal conditional reasoning. Thinking & Reasoning, 11, 278-293), and the probabilistic theory (Oaksford, M., Chater, N., & Larkin, J. (2000). Probabilities and polarity biases in conditional inference. Journal of Experimental Psychology: Learning, Memory, and Cognition, 26, 883-899). The first three theories are formalized as multinomial models. The models are applied to the frequencies of patterns of acceptance or rejection across the four basic inferences modus ponens, acceptance of the consequent, denial of the antecedent, and modus tollens. Model fits are assessed for two large data sets, one representing reasoning with abstract, basic conditionals, the other reflecting reasoning with pseudo-realistic causal and non-causal conditionals. The best account of the data was provided by a modified version of the mental-model theory, augmented by directionality, and by the dual-process model.
KW - conditionals
KW - reasoning
KW - multinomial models
Y1 - 2006
U6 - https://doi.org/10.1016/j.cogpsych.2006.04.001
SN - 0010-0285
VL - 53
IS - 3
SP - 238
EP - 283
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Schatzabel, Hartmut
A1 - Meyer, S.
T1 - Reality, system, model, prediction : the modeling approach
Y1 - 2006
ER -
TY - THES
A1 - Buchholz, Henrik
T1 - Real-time visualization of 3D city models
T1 - Echtzeit-Visualisierung von 3D-Stadtmodellen
N2 - An increasing number of applications requires user interfaces that facilitate the handling of large geodata sets. Using virtual 3D city models, complex geospatial information can be communicated visually in an intuitive way. Therefore, real-time visualization of virtual 3D city models represents a key functionality for interactive exploration, presentation, analysis, and manipulation of geospatial data. This thesis concentrates on the development and implementation of concepts and techniques for real-time city model visualization. It discusses rendering algorithms as well as complementary modeling concepts and interaction techniques. Particularly, the work introduces a new real-time rendering technique to handle city models of high complexity concerning texture size and number of textures. Such models are difficult to handle by current technology, primarily due to two problems: - Limited texture memory: The amount of simultaneously usable texture data is limited by the memory of the graphics hardware. - Limited number of textures: Using several thousand different textures simultaneously causes significant performance problems due to texture switch operations during rendering. The multiresolution texture atlases approach, introduced in this thesis, overcomes both problems. During rendering, it permanently maintains a small set of textures that are sufficient for the current view and the screen resolution available. The efficiency of multiresolution texture atlases is evaluated in performance tests. To summarize, the results demonstrate that the following goals have been achieved: - Real-time rendering becomes possible for 3D scenes whose amount of texture data exceeds the main memory capacity. - Overhead due to texture switches is kept permanently low, so that the number of different textures has no significant effect on the rendering frame rate. Furthermore, this thesis introduces two new approaches for real-time city model visualization that use textures as core visualization elements: - An approach for visualization of thematic information. - An approach for illustrative visualization of 3D city models. Both techniques demonstrate that multiresolution texture atlases provide a basic functionality for the development of new applications and systems in the domain of city model visualization.
N2 - Eine zunehmende Anzahl von Anwendungen benötigt Benutzungsschnittstellen, um den Umgang mit großen Geodatenmengen zu ermöglichen. Virtuelle 3D-Stadtmodelle bieten eine Möglichkeit, komplexe raumbezogene Informationen auf intuitive Art und Weise visuell erfassbar zu machen. Echtzeit-Visualisierung virtueller Stadtmodelle bildet daher eine Grundlage für die interaktive Exploration, Präsentation, Analyse und Bearbeitung raumbezogener Daten. Diese Arbeit befasst sich mit der Entwicklung und Implementierung von Konzepten und Techniken für die Echtzeit-Visualisierung virtueller 3D-Stadtmodelle. Diese umfassen sowohl Rendering-Algorithmen als auch dazu komplementäre Modellierungskonzepte und Interaktionstechniken. Insbesondere wird in dieser Arbeit eine neue Echtzeit-Rendering-Technik für Stadtmodelle hoher Komplexität hinsichtlich Texturgröße und Texturanzahl vorgestellt. Solche Modelle sind durch die derzeit zur Verfügung stehende Technologie schwierig zu bewältigen, vor allem aus zwei Gründen: - Begrenzter Textur-Speicher: Die Menge an gleichzeitig nutzbaren Texturdaten ist beschränkt durch den Speicher der Grafik-Hardware. - Begrenzte Textur-Anzahl: Die gleichzeitige Verwendung mehrerer tausend Texturen verursacht erhebliche Performance-Probleme aufgrund von Textur-Umschaltungs-Operationen während des Renderings. Das in dieser Arbeit vorgestellte Verfahren, das Rendering mit Multiresolutions-Texturatlanten löst beide Probleme. Während der Darstellung wird dazu permanent eine kleine Textur-Menge verwaltet, die für die aktuelle Sichtperspektive und die zur Verfügung stehende Bildschirmauflösung hinreichend ist. Die Effizienz des Verfahrens wird in Performance-Tests untersucht. Die Ergebnisse zeigen, dass die folgenden Ziele erreicht werden: - Echtzeit-Darstellung wird für Modelle möglich, deren Texturdaten-Menge die Kapazität des Hauptspeichers übersteigt. - Der Overhead durch Textur-Umschaltungs-Operationen wird permanent niedrig gehalten, so dass die Anzahl der unterschiedlichen Texturen keinen wesentlichen Einfluss auf die Bildrate der Darstellung hat. Die Arbeit stellt außerdem zwei neue Ansätze zur 3D-Stadtmodell-Visualisierung vor, in denen Texturen als zentrale Visualisierungselemente eingesetzt werden: - Ein Verfahren zur Visualisierung thematischer Informationen. - Ein Verfahren zur illustrativen Visualisierung von 3D-Stadtmodellen. Beide Ansätze zeigen, dass Rendering mit Multiresolutions-Texturatlanten eine Grundlage für die Entwicklung neuer Anwendungen und Systeme im Bereich der 3D-Stadtmodell-Visualisierung bietet.
KW - Computergrafik
KW - Geovisualisierung
KW - 3D-Stadtmodelle
KW - Texturen
KW - computer graphics
KW - geovisualization
KW - 3d city models
KW - textures
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-13337
ER -
TY - JOUR
A1 - Baur, Heiner
A1 - Müller, Steffen
A1 - Hirschmüller, Anja
A1 - Huber, Georg
A1 - Mayer, Frank
T1 - Reactivity, stability, and strength performance capacity in motor sports
JF - British journal of sports medicine : the journal of sport and exercise medicine
N2 - Background: Racing drivers require multifaceted cognitive and physical abilities in a multitasking situation. A knowledge of their physical capacities may help to improve fitness and performance. Objective: To compare reaction time, stability performance capacity, and strength performance capacity of elite racing drivers with those of age-matched, physically active controls. Methods: Eight elite racing drivers and 10 physically active controls matched for age and weight were tested in a reaction and determination test requiring upper and lower extremity responses to visual and audio cues. Further tests comprised evaluation of one-leg postural stability on a two-dimensional moveable platform, measures of maximum strength performance capacity of the extensors of the leg on a leg press, and a test of force capacity of the arms in a sitting position at a steering wheel. An additional arm endurance test consisted of isometric work at the steering wheel at + 30 degrees and -30 degrees where an eccentric threshold load of 30 N.m was applied. Subjects had to hold the end positions above this threshold until exhaustion. Univariate one way analysis of variance (alpha = 0.05) including a Bonferroni adjustment was used to detect group differences between the drivers and controls. Results: The reaction time of the racing drivers was significantly faster than the controls ( p = 0.004). The following motor reaction time and reaction times in the multiple determination test did not differ between the groups. No significant differences (p> 0.05) were found for postural stability, leg extensor strength, or arm strength and endurance. Conclusions: Racing drivers have faster reaction times than age-matched physically active controls. Further development of motor sport-specific test protocols is suggested. According to the requirements of motor racing, strength and sensorimotor performance capacity can potentially be improved.
Y1 - 2006
U6 - https://doi.org/10.1136/bjsm.2006.025783
SN - 0306-3674
VL - 40
SP - 906
EP - 910
PB - BMJ Publ. Group
CY - London
ER -
TY - JOUR
A1 - Rohn, Sascha
A1 - Petzke, Klaus-Jürgen
A1 - Rawel, Harshadrai Manilal
A1 - Kroll, Jürgen
T1 - Reactions of chlorogenic acid and quercetin with a soy protein isolate - Influence on the in vivo food protein quality in rats
JF - Molecular nutrition & food research : bioactivity, chemistry, immunology, microbiology, safety, technology
N2 - Plant phenolic compounds are known to interact with proteins producing changes in the food (e.g., biological value (BV), color, taste). Therefore, the in vivo relevance, especially, of covalent phenolprotein reactions on protein quality was studied in a rat bioassay. The rats were fed protein derivatives at a 10% protein level. Soy proteins were derivatized with chlorogenic acid and quercetin (derivatization levels: 0.056 and 0.28 mmol phenolic compound/gram protein). Analysis of nitrogen in diets, urine, and fecal samples as well as the distribution of amino acids were determined. Depending on the degree of derivatization, the rats fed with soy protein derivatives showed an increased excretion of fecal and urinary nitrogen. As a result, true nitrogen digestibility, BV, and net protein utilization were adversely affected. Protein digestibility corrected amino acid score was decreased for lysine, tryptophan, and sulfur containing amino acids.
KW - amino acid score
KW - plant phenolic compounds
KW - protein derivatization
KW - protein digestibility
KW - soy protein
Y1 - 2006
U6 - https://doi.org/10.1002/mnfr.200600043
SN - 1613-4125
VL - 50
SP - 696
EP - 704
PB - Wiley
CY - Weinheim
ER -
TY - BOOK
A1 - Eckstein, Lars
T1 - Re-Membering the Black Atlantic : on the poetics and politics of literary memory
T3 - Cross cultures
Y1 - 2006
SN - 94-420-1958-1
VL - 84
PB - Rodopi
CY - Amsterdam
ER -
TY - THES
A1 - Förster, Hannah
T1 - Rationing & Bayesian expectations with application to the labour market
T1 - Rationierung und Bayesianische Erwartungen mit Anwendung auf den Arbeitsmarkt
N2 - The first goal of the present work focuses on the need for different rationing methods of the The Global Change and Financial Transition (GFT) work- ing group at the Potsdam Institute for Climate Impact Research (PIK): I provide a toolbox which contains a variety of rationing methods to be ap- plied to micro-economic disequilibrium models of the lagom model family. This toolbox consists of well known rationing methods, and of rationing methods provided specifically for lagom. To ensure an easy application the toolbox is constructed in modular fashion. The second goal of the present work is to present a micro-economic labour market where heterogenous labour suppliers experience consecu- tive job opportunities and need to decide whether to apply for employ- ment. The labour suppliers are heterogenous with respect to their qualifi- cations and their beliefs about the application behaviour of their competi- tors. They learn simultaneously – in Bayesian fashion – about their individ- ual perceived probability to obtain employment conditional on application (PPE) by observing each others’ application behaviour over a cycle of job opportunities.
N2 - In vorliegender Arbeit beschäftige ich mich mit zwei Dingen. Zum einen entwickle ich eine Modellierungstoolbox, die verschiedene Rationierungs- methoden enthält. Diese Rationierungsmethoden sind entweder aus der Literatur bekannt, oder wurden speziell für die lagom Modellfamilie ent- wickelt. Zum anderen zeige ich, dass man mit Hilfe von Rationierungsmetho- den aus der Modellierungstoolbox einen fiktiven Arbeitsmarkt modellie- ren kann. Auf diesem agieren arbeitssuchende Agenten, die heterogen im Bezug auf ihre Qualifikation und ihre Vorstellungen über das Bewerbungs- verhalten ihrer Konkurrenten sind. Sie erfahren aufeinanderfolgende Job- angebote und beobachten das Bewerbungsverhalten ihrer Konkurrenten, um in Bayesianischer Weise über ihre individuelle Wahrscheinlichkeit eine Stelle zu erhalten zu lernen.
KW - Rationierung
KW - Ungleichgewicht
KW - Bayes
KW - Interaktion
KW - Lernprozesse
KW - rationing
KW - bayesian inference
KW - learning processes
KW - disequilibrium
KW - agent interaction
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-15217
ER -
TY - JOUR
A1 - Carminati, Rémi
A1 - Greffet, Jean-Jacques
A1 - Henkel, Carsten
A1 - Vigoureux, Jean-Marie
T1 - Radiative and non-radiative decay of a single molecule close to a metallic nanoparticle
N2 - We study the spontaneous emission of a single emitter close to a metallic nanoparticle, with the aim to clarify the distance dependence of the radiative and non-radiative decay rates. We derive analytical formulas based on a dipole- dipole model, and show that the nonradiative decay rate follows a R-6 dependence at short distance, where R is the distance between the emitter and the center of the nanoparticle, as in Forster's energy transfer. The distance dependence of the radiative decay rate is more subtle. It is chiefly dominated by a R-3 dependence, a R-6 dependence being visible at plasmon resonance. The latter is a consequence of radiative damping in the effective dipole polarizability of the nanoparticle. The different distance behavior of the radiative and non-radiative decay rates implies that the apparent quantum yield always vanishes at short distance. Moreover, non-radiative decay is strongly enhanced when the emitter radiates at the plasmon-resonance frequency of the nanoparticle.
Y1 - 2006
UR - http://www.sciencedirect.com/science/journal/00304018
U6 - https://doi.org/10.1016/j.optcom.2005.12.009
SN - 0030-4018
ER -
TY - INPR
A1 - Denk, Robert
A1 - Krainer, Thomas
T1 - R-Boundedness, pseudodifferential operators, and maximal regularity for some classes of partial differential operators
N2 - It is shown that an elliptic scattering operator A on a compact manifold with boundary with operator valued coefficients in the morphisms of a bundle of Banach spaces of class (HT ) and Pisier’s property (α) has maximal regularity (up to a spectral shift), provided that the spectrum of the principal symbol of A on the scattering cotangent bundle avoids the right half-plane. This is accomplished by representing the resolvent in terms of pseudodifferential operators with R-bounded symbols, yielding by an iteration argument the R-boundedness of λ(A − λ)−1 in R(λ)≥ τ for some τ ∈ IR. To this end, elements of a symbolic and operator calculus of pseudodifferential operators with R-bounded symbols are introduced. The significance of this method for proving maximal regularity results for partial differential operators is underscored by considering also a more elementary situation of anisotropic elliptic operators on Rd with operator valued coefficients.
T3 - Preprint - (2006) 14
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-30147
ER -
TY - BOOK
A1 - Denk, Robert
A1 - Krainer, Thomas
T1 - R-Boundedness, pseudodifferential operators and maximal regularity for some classes of partial differential operators
T3 - Preprint / Universität Potsdam, Institut für Mathematik, Arbeitsgruppe Partiell
Y1 - 2006
SN - 1437-739X
PB - Univ.
CY - Potsdam
ER -
TY - BOOK
A1 - Skopeteas, Stavros
A1 - Fiedler, Ines
A1 - Hellmuth, Sam
A1 - Schwarz, Anne
A1 - Stoel, Ruben
A1 - Fanselow, Gisbert
A1 - Féry, Caroline
A1 - Krifka, Manfred
T1 - Questionnaire on information structure (OUIS): reference manual
N2 - Contents: Chapter 1. Introduction 1 Information Structure 2 Grammatical Correlates of Information Structure 3 Structure of the Questionnaire 4 Experimental Tasks 5 Technicalities 6 Archiving 7 Acknowledgments Chapter 2. General Questions 1 General Information 2 Phonology 3 Morphology and Syntax Chapter 3. Experimental tasks 1 Changes (Given/New in Intransitives and Transitives) 2 Giving (Given/New in Ditransitives) 3 Visibility (Given/New, Animacy and Type/Token Reference) 4 Locations (Given/New in Locative Expressions) 5 Sequences (Given/New/Contrast in Transitives) 6 Dynamic Localization (Given/New in Dynamic Loc. Descriptions) 7 Birthday Party (Weight and Discourse Status) 8 Static Localization (Macro-Planning and Given/New in Locatives) 9 Guiding (Presentational Utterances) 10 Event Cards (All New) 11 Anima (Focus types and Animacy) 12 Contrast (Contrast in pairing events) 13 Animal Game (Broad/Narrow Focus in NP) 14 Properties (Focus on Property and Possessor) 15 Eventives (Thetic and Categorical Utterances) 16 Tell a Story (Contrast in Text) 17 Focus Cards (Selective, Restrictive, Additive, Rejective Focus) 18 Who does What (Answers to Multiple Constituent Questions) 19 Fairy Tale (Topic and Focus in Coherent Discourse) 20 Map Task (Contrastive and Selective Focus in Spontaneous Dialogue) 21 Drama (Contrastive Focus in Argumentation) 22 Events in Places (Spatial, Temporal and Complex Topics) 23 Path Descriptions (Topic Change in Narrative) 24 Groups (Partial Topic) 25 Connections (Bridging Topic) 26 Indirect (Implicational Topic) 27 Surprises (Subject-Topic Interrelation) 28 Doing (Action Given, Action Topic) 29 Influences (Question Priming) Chapter 4. Translation tasks 1 Basic Intonational Properties 2 Focus Translation 3 Topic Translation 4 Quantifiers Chapter 5. Information structure summary survey 1 Preliminaries 2 Syntax 3 Morphology 4 Prosody 5 Summary: Information structure Chapter 6. Performance of Experimental Tasks in the Field 1 Field sessions 2 Field Session Metadata 3 Informants’ Agreement
T3 - Interdisciplinary studies on information structure : ISIS ; working papers of the SFB 632 - 4
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12413
SN - 978-3-939469-14-8
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - CHAP
A1 - Hara, Yurie
T1 - Question intonation and lexicalized bias expression
N2 - This paper examines the interaction between different utterance types and the Japanese modal particle darou, and proposes that the decision-theoretic semantics accounts for the interaction among darou, sentence types and intonation.
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-10323
ER -
TY - THES
A1 - Cramer, Marcus
T1 - Quasi-free systems on general lattices : criticality, entanglement-area laws, and single-copy entanglement
Y1 - 2006
CY - Potsdam
ER -
TY - THES
A1 - Klamroth, Tillmann
T1 - Quantum mechanical simulations for correlated many-electron dynamics and electron induced processes at surfaces
Y1 - 2006
CY - Potsdam
ER -
TY - JOUR
A1 - Saalfrank, Peter
A1 - Nest, Mathias
A1 - Andrianov, Igor V.
A1 - Klamroth, Tillmann
A1 - Kroner, Dominic
A1 - Beyvers, Stephanie
T1 - Quantum dynamics of laser-induced desorption from metal and semiconductor surfaces, and related phenomena
N2 - Recent progress towards a quantum theory of laser-induced desorption and related phenomena is reviewed, for specific examples. These comprise the photodesorption of NO from Pt(111), the scanning tunnelling microscope and laser- induced desorption and switching of H at Si(100), and the electron stimulated desorption and dissociation of CO at Ru(0001). The theoretical methods used for nuclear dynamics range from open-system density matrix theory over nonadiabatically coupled multi-state models to electron-nuclear wavepackets. Also, aspects of time-dependent spectroscopy to probe ultrafast nonadiabatic processes at surfaces will be considered for the example of two-photon photoemission of solvated electrons in ice layers on Cu(111)
Y1 - 2006
UR - http://iopscience.iop.org/0953-8984/18/30/S05/pdf/0953-8984_18_30_S05.pdf
U6 - https://doi.org/10.1088/0953-8984/18/30/S05
SN - 1361-648X
SN - 0953-8984
VL - 18
IS - 30
SP - S1425
EP - S1459
PB - IOP Publ.
CY - Bristol
ER -
TY - JOUR
A1 - Saalfrank, Peter
T1 - Quantum dynamical approach to ultrafast molecular desorption from surfaces
JF - Chemical reviews
Y1 - 2006
U6 - https://doi.org/10.1021/cr0501691
SN - 0009-2665
SN - 1520-6890
VL - 106
IS - 10
SP - 4116
EP - 4159
PB - American Chemical Society
CY - Washington
ER -
TY - GEN
A1 - Hildebrandt, Nico
A1 - Charbonnière, Loïc J.
A1 - Ziessel, Raymond F.
A1 - Löhmannsröben, Hans-Gerd
T1 - Quantum dots as resonance energy transfer acceptors for monitoring biological interactions
N2 - Quantum dots (QDs) are common as luminescing markers for imaging in biological applications because their optical properties seem to be inert against their surrounding solvent. This, together with broad and strong absorption bands and intense, sharp tuneable luminescence bands, makes them interesting candidates for methods utilizing Forster Resonance Energy Transfer (FRET), e. g. for sensitive homogeneous fluoroimmunoassays (FIA). In this work we demonstrate energy transfer from Eu3+-trisbipyridin (Eu-TBP) donors to CdSe-ZnS-QD acceptors in solutions with and without serum. The QDs are commercially available CdSe-ZnS core-shell particles emitting at 655 nm (QD655). The FRET system was achieved by the binding of the streptavidin conjugated donors with the biotin conjugated acceptors. After excitation of Eu-TBP and as result of the energy transfer, the luminescence of the QD655 acceptors also showed lengthened decay times like the donors. The energy transfer efficiency, as calculated from the decay times of the bound and the unbound components, amounted to 37%. The Forster-radius, estimated from the absorption and emission bands, was ca. 77Å. The effective binding ratio, which not only depends on the ratio of binding pairs but also on unspecific binding, was obtained from the donor emission dependent on the concentration. As serum promotes unspecific binding, the overall FRET efficiency of the assay was reduced. We conclude that QDs are good substitutes for acceptors in FRET if combined with slow decay donors like Europium. The investigation of the influence of the serum provides guidance towards improving binding properties of QD assays.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 012
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12213
ER -
TY - GEN
A1 - Beck, Michael
A1 - Hildebrandt, Niko
A1 - Löhmannsröben, Hans-Gerd
T1 - Quantum dots as acceptors in FRET-assays containing serum
N2 - Quantum dots (QDs) are common as luminescing markers for imaging in biological applications because their optical properties seem to be inert against their surrounding solvent. This, together with broad and strong absorption bands and intense, sharp tuneable luminescence bands, makes them interesting candidates for methods utilizing Förster Resonance Energy Transfer (FRET), e. g. for sensitive homogeneous fluoroimmunoassays (FIA). In this work we demonstrate energy transfer from Eu3+-trisbipyridin (Eu-TBP) donors to CdSe-ZnS-QD acceptors in solutions with and without serum. The QDs are commercially available CdSe-ZnS core-shell particles emitting at 655 nm (QD655). The FRET system was achieved by the binding of the streptavidin conjugated donors with the biotin conjugated acceptors. After excitation of Eu-TBP and as result of the energy transfer, the luminescence of the QD655 acceptors also showed lengthened decay times like the donors. The energy transfer efficiency, as calculated from the decay times of the bound and the unbound components, amounted to 37%. The Förster-radius, estimated from the absorption and emission bands, was ca. 77 Å. The effective binding ratio, which not only depends on the ratio of binding pairs but also on unspecific binding, was obtained from the donor emission dependent on the concentration. As serum promotes unspecific binding, the overall FRET efficiency of the assay was reduced. We conclude that QDs are good substitutes for acceptors in FRET if combined with slow decay donors like Europium. The investigation of the influence of the serum provides guidance towards improving binding properties of QD assays.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 019
KW - Quantenpunkt
KW - Lumineszenz
KW - Serum
KW - Europium
KW - Immunoassay
KW - Energietransfer
KW - Fluoreszenz-Resonanz-Energie-Transfer
KW - Förster-Resonanz-Energie-Transfer
KW - Quantum Dot
KW - Luminescence
KW - Serum
KW - Europium
KW - Immunoassay
KW - Energy Transfer
KW - FRET
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-9504
ER -
TY - THES
A1 - Lunemann, Carolin
T1 - Quantum cryptography : security analysis of multiuser quantum communication with embedded authentication
N2 - Three quantum cryptographic protocols of multiuser quantum networks with embedded authentication, allowing quantum key distribution or quantum direct communication, are discussed in this work. The security of the protocols against different types of attacks is analysed with a focus on various impersonation attacks and the man-in-the-middle attack. On the basis of the security analyses several improvements are suggested and implemented in order to adjust the investigated vulnerabilities. Furthermore, the impact of the eavesdropping test procedure on impersonation attacks is outlined. The framework of a general eavesdropping test is proposed to provide additional protection against security risks in impersonation attacks.
N2 - In der Diplomarbeit werden drei verschiedene quantenkryptographische Protokolle mit dem Schwerpunkt auf authentifizierten Quantennetzwerken analysiert. Die Sicherheit der Protokolle gegenüber verschiedenen Angriffen wird untersucht, wobei der Fokus auf kompletten Personifikationsattacken („impersonation attacks“) liegt. Auf Basis der Sicherheitsanalyse und den Netzwerkanforderungen werden entsprechende Verbesserungen vorgeschlagen. Um die Gefahr von Personifikationen realistisch abschätzen zu können, wird außerdem der Einfluss des Testablaufs analysiert. Um zusätzlichen Schutz gegen Personifikationsattacken zu gewährleisten, werden die Rahmenbedingungen für eine allgemeine Testspezifikation festgelegt.
KW - Kryptographie
KW - Quantenkryptographie
KW - Authentifizierung
KW - Netzwerk
KW - cryptography
KW - quantum cryptography
KW - authentication
KW - multiuser
KW - network
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12756
ER -
TY - JOUR
A1 - Nest, Mathias
T1 - Quantum carpets and correlated dynamics of several fermions
N2 - We study theoretically the coherent and correlated motion of many fermions inside an infinite square well potential. We will look at electrons and He-3 atoms, which behave very differently not only because of their masses, but also because of their different interaction potential. Also, the level of theory and the role of approximations in the solution of the time-dependent Schrodinger equation will be discussed
Y1 - 2006
UR - http://pra.aps.org/
U6 - https://doi.org/10.1103/Physreva.73.023613
ER -
TY - THES
A1 - Schauer, Nicolas
T1 - Quantitative trait loci (QTL) for metabolite accumulation and metabolic regulation : metabolite profiling of interspecific crosses of tomato
T1 - Metabolomische Analyse von interspezifischen Tomaten
N2 - The advent of large-scale and high-throughput technologies has recently caused a shift in focus in contemporary biology from decades of reductionism towards a more systemic view. Alongside the availability of genome sequences the exploration of organisms utilizing such approach should give rise to a more comprehensive understanding of complex systems. Domestication and intensive breeding of crop plants has led to a parallel narrowing of their genetic basis. The potential to improve crops by conventional breeding using elite cultivars is therefore rather limited and molecular technologies, such as marker assisted selection (MAS) are currently being exploited to re-introduce allelic variance from wild species. Molecular breeding strategies have mostly focused on the introduction of yield or resistance related traits to date. However given that medical research has highlighted the importance of crop compositional quality in the human diet this research field is rapidly becoming more important. Chemical composition of biological tissues can be efficiently assessed by metabolite profiling techniques, which allow the multivariate detection of metabolites of a given biological sample. Here, a GC/MS metabolite profiling approach has been applied to investigate natural variation of tomatoes with respect to the chemical composition of their fruits. The establishment of a mass spectral and retention index (MSRI) library was a prerequisite for this work in order to establish a framework for the identification of metabolites from a complex mixture. As mass spectral and retention index information is highly important for the metabolomics community this library was made publicly available. Metabolite profiling of tomato wild species revealed large differences in the chemical composition, especially of amino and organic acids, as well as on the sugar composition and secondary metabolites. Intriguingly, the analysis of a set of S. pennellii introgression lines (IL) identified 889 quantitative trait loci of compositional quality and 326 yield-associated traits. These traits are characterized by increases/decreases not only of single metabolites but also of entire metabolic pathways, thus highlighting the potential of this approach in uncovering novel aspects of metabolic regulation. Finally the biosynthetic pathway of the phenylalanine-derived fruit volatiles phenylethanol and phenylacetaldehyde was elucidated via a combination of metabolic profiling of natural variation, stable isotope tracer experiments and reverse genetic experimentation.
N2 - Die Einführung von Hochdurchsatzmethoden zur Analyse von biologischen Systemen, sowie die umfangreiche Sequenzierung von Genomen haben zu einer Verlagerung der Forschung „im Detail“ zu einer ganzheitlicheren Betrachtungsweise auf Systemebene geführt. Aus einer jahrhundertlangen, intensiven Züchtung und Selektion von Nutzpflanzen resultierte gleichzeitig eine Abnahme der genetischen Varianz. Daraus resultierend sind Nutzpflanzen anfälliger gegenüber Stressfaktoren, wie Pathogenen, hohen Salzkonzentrationen oder Trockenheit, als ihre Wildarten. Das Potential konventioneller Züchtung scheint somit heute an seine Grenzen gekommen zu sein. Daher versucht man mittels moderner Molekulartechnik, wie zum Beispiel Marker-gestützte Selektion, Gene oder ganze Genombereiche von Wildarten mit hoher genetischer Variation in Nutzpflanzen einzukreuzen, vornehmlich mit dem Ziel einer Ertrags- bzw. Resistenzsteigerung. Neueste medizinische Studien belegen, dass die Ernährung eine wesentliche Rolle für die menschliche Gesundheit spielt. Besonders wichtig sind hierbei die gesundheitsfördernden Substanzen in pflanzlichen Nahrungsmitteln. Aus diesem Grund kommt der Erforschung der biochemischen Zusammensetzung von biologischen Proben eine immer größere Bedeutung zu. Diese Untersuchung kann elegant durch Metabolitenprofile, welche die multivariate Analyse komplexer biologischer Proben erlauben, durchgeführt werden. In dieser Arbeit wurde zur Untersuchung der biochemischen Zusammensetzung von Tomatenwildarten und interspezifischen S. pennellii Tomatenintrogressionslinien (IL) eine GC/MS basierte Metabolitenanalyseplattform verwendet. Hierzu war es zunächst notwendig eine Massenspektrenbibliothek, zur Annotierung von Massenspektren und Retentionsindices von, in pflanzlichen Proben vorkommenden, Metaboliten anzulegen. Die Analyse der Tomatenwildarten ergab große Unterschiede gegenüber der Kulturtomate im Hinblick auf den Gehalt an Amino- und organischen Säuren, sowie der Zuckerzusammensetzung und den Gehalt an Sekundärmetaboliten. Die darauf folgende Analyse der ILs, von den jede ein genau definiertes genomisches Segment von S. pennellii beinhaltet, bestätigte diese enorme Variation mit 889 metabolischen und 326 ertragsassozierten-Veränderungen in den ILs. Die metabolischen Veränderungen zeichneten sich durch abnehmende bzw. steigende Gehalte von einzelnen Metaboliten, aber auch durch eine koordinierte Änderung aus. In dieser Arbeit wurde weiterhin der Biosyntheseweg der Volatilenstoffe Phenylethanol und Phenylacetaldehyd mit Hilfe einer IL untersucht. Hierbei konnten durch stabile Isotopenmarkierung und eines „reverse genetics“-Ansatzes Gene bzw. Enzyme identifiziert werden, die für die Dekarboxylierung des Eduktes Phenylalanin verantwortlich sind. Diese Arbeit beschreibt erstmals die umfassende Analyse von biochemischen Komponenten auf Genombasis in Tomatenintrogressionslinien und zeigt damit ein Werkzeug auf zur Identifizierung von qualitativen biochemischen Merkmalen in der modernen molekularen Züchtung.
KW - Tomate
KW - Metabolit
KW - GC-MS
KW - Introgression
KW - Frucht
KW - Metabolome
KW - Züchtung
KW - metabolic genomics
KW - Tomato
KW - metabolite profiling
KW - metabolome
KW - breeding
KW - crops
KW - fruit
KW - metabolite breeding
KW - metabolic genomics
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7643
ER -
TY - JOUR
A1 - De Bleser, Ria
A1 - Schwarz, Wolfgang
A1 - Burchert, Frank
T1 - Quantitative neurosyntactic analyses : the final word?
Y1 - 2006
UR - http://www.sciencedirect.com/science/journal/0093934X
U6 - https://doi.org/10.1016/j.bandl.2005.06.010
SN - 0093-934X
ER -
TY - JOUR
A1 - Endriss, Cornelia
A1 - Hinterwimmer, Stefan
T1 - Quantificational Variability Effects with plural definites
BT - quantification over individuals or situations?
N2 - In this paper we compare the behaviour of adverbs of frequency (de Swart 1993) like usually with the behaviour of adverbs of quantity like for the most part in sentences that contain plural definites. We show that sentences containing the former type of Q-adverb evidence that Quantificational Variability Effects (Berman 1991) come about as an indirect effect of quantification over situations: in order for quantificational variability readings to arise, these sentences have to obey two newly observed constraints that clearly set them apart from sentences containing corresponding quantificational DPs, and that can plausibly be explained under the assumption that quantification over (the atomic parts of) complex situations is involved. Concerning sentences with the latter type of Q-adverb, on the other hand, such evidence is lacking: with respect to the constraints just mentioned, they behave like sentences that contain corresponding quantificational DPs. We take this as evidence that Q-adverbs like for the most part do not quantify over the atomic parts of sum eventualities in the cases under discussion (as claimed by Nakanishi and Romero (2004)), but rather over the atomic parts of the respective sum individuals.
KW - Adverbial Quantification
KW - Situations
KW - Tense Semantics
KW - Adverbs of Frequency
KW - Adverbs of Quantity
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-19512
ER -
TY - JOUR
A1 - Kleinpeter, Erich
A1 - Schulenburg, Anja
T1 - Quantification of the push-pull effect in tolanes and a revaluation of the factors affecting the C-13 chemical shifts of the carbon atoms of the C=C triple bond
N2 - Variously substituted tolanes were employed to show that the push-pull effect is also active in C equivalent to C triple bonds by the successful correlation of the occupation quotient pi*/pi of the pi orbital in resonance with the substituted phenyl moieties of tolanes versus the bond length of the C equivalent to C triple bond. In addition, the influences of the ortho phenyl ring substituents on the C-13 chemical shifts of the triple bond carbon atoms, which were estimated by Rubin et al.(4) to be "inapplicable for describing triple bond polarization", were re-evaluated, leading to the conclusion that, while anisotropic effects of ortho substituents are negligible, the steric ortho-substituent effects do in fact dominate the deviations obtained. A detailed theoretical NBO/NCS study has been employed to illuminate the facts of this case
Y1 - 2006
UR - http://pubs.acs.org/journal/joceah
U6 - https://doi.org/10.1021/Jo060199j
SN - 0022-3263
ER -
TY - JOUR
A1 - De Andrade, V.
A1 - Vidal, O.
A1 - Lewin, E.
A1 - Agard, P.
A1 - O'brien, Patrick
T1 - Quantification of electron microprobe compositional maps of rock thin sections: an optimized method and examples
JF - Journal of metamorphic geology
N2 - Quantification of discrete pressure-temperature domains in deformed chlorite + white mica-bearing metapelites was undertaken on mineral compositions derived by two-dimensional microprobe compositional mapping of selected areas of rock thin sections. In order to achieve compositional information at sufficient analytical precision, spatial resolution and sample coverage within a typical analysis time of 1 day, an optimization of measurement methods was necessary. The method presented here allows collection of raw counts for eight different element concentrations at an analytical precision of similar to 1-2 wt%. X-ray intensity multiplane maps (one map per measured chemical element) are translated into concentration multiplane maps, utilizing selected conventionally measured spot analyses combined with the Castaing approximation for each mineral. As this step requires identification of the different minerals present in the mapped area, a statistical clustering technique to identify different groups of composition was developed, guided by simple petrographic inspection of the thin section, to delineate the important minerals in the mapped area. Finally, the compositions of each pixel are translated into a mineral structural formula thus yielding a new kind of image with a high content of petrological information. The reliability of the mineral composition images was emphasized by carrying out precision tests on the analytical data. The possible use of chemical maps to infer the P-T-deformation history of metamorphic rocks is illustrated with two samples from the Spitzbergen and the Sambagawa blueschist facies belts. In both samples, a strong correlation between structures and chemistry is observed. Qualitative estimates of P-T conditions from the Si-content of mica and chlorite are in good agreement with their location in microstructures that formed at different times. Therefore, the combination of chemical maps with microstructural observations is a very powerful approach to understand both the evolution of complex metamorphic rocks and the control by deformation of mineral reactivity.
KW - chlorite
KW - compositional map
KW - electron microprobe
KW - mica
KW - Sambagawa
KW - Spitzbergen
KW - X-ray mapping
Y1 - 2006
U6 - https://doi.org/10.1111/j.1525-1314.2006.00660.x
SN - 0263-4929
VL - 24
SP - 655
EP - 668
PB - Wiley-Blackwell
CY - Oxford
ER -
TY - JOUR
A1 - Senarath Nanayakkara, G. L.
A1 - Neumann, Klaus D.
A1 - Pohlenz, Philipp
T1 - Quality assurance in Sri Lankan Teacher Training
BT - evaluation procedures for the assessment of the internship period
JF - Potsdamer Beiträge zur Lehrevaluation
N2 - In 2002 guidelines for the implementation of the internship programme for prospective teachers have been released in a joint venture by the Basic Education Sector Programme(BESP) of the GTZ (Gesellschaft für Technische Zusammenarbeit/German Technical Cooperation) and the Professional Development Centre (Teacher Education) of the National Institute for Education of Sri Lanka (NIE). These guidelines aim at assisting the National Colleges of Education (NCOEs) and internship schools in implementing the internship programme and at improving its efficiency and effectiveness in the local venues of teacher training. The Monitoring & Evaluation activity described in the present article was to assess as to how far the intentions originally associated with the internship programme are being accomplished. Its main task is to bring strengths and weaknesses of the programme to light and to appraise the current status of its implementation.
KW - Qualitätssicherung
KW - Lehrerbildung
KW - Evaluation
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-22017
SN - 3-937786-08-2
SN - 1614-0273
SN - 1862-8664
VL - 2
SP - 301
EP - 319
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Pohlenz, Philipp
T1 - Quality assurance in Sri Lanka teacher trainning evaluation procedures for the assessment of the internship period
Y1 - 2006
SN - 3- 937786-08-2
ER -
TY - JOUR
A1 - Kleinpeter, Erich
T1 - Push-pull alkenes : structure and pi-electron distribution
N2 - Push-pull alkenes are substituted alkenes with one or two electron-donating substituents on one end of C=C double bond and with one or two electron-accepting substituents at the other end. Allowance for pi-electron delocalization leads to the central C=C double bond becoming ever more polarized and with rising push-pull character, the pi-bond order of this double bond is reduced and, conversely, the corresponding pi-bond orders of the C-Don and C- Ace bonds are accordingly increased. This push-pull effect is of decisive influence on both the dynamic behavior and the chemical reactivity of this class of compounds and thus it is Of Considerable interest to both determine and to quantify the inherent push-pull effect. previously, the barriers to rotation about the C=C, C-Don and/or C-Acc partial double bonds (Delta G(not equal), as determined by dynamic NMR spectroscopy) or the C-13 chemical shift difference of the polarized C=C partial double bond (Delta delta(C=C)) were employed for this purpose, However, these parameters can have serious limitations, viz. the barriers can be immeasurable on the NMR timescale (either by being too high or too low-, heavily-biased conformers are present, etc.) or Delta delta(C=C) behaves in a non-additive manner with respect to the combination of the four substituents. Hence, a general parameter to quantify the push-pull effect is not yet available. Ab initio MO calculations on a collection of compounds, together with NBO analysis, provided valuable information on the structure, bond energies, electron occupancies and bonding/antibonding interactions. In addition to Delta G(C=C)(not equal) (either experimentally determined or theoretically calculated) and Delta delta(C=C), the bond length of the C=C partial double bond was also examined and it proved to be a reliable parameter to quantify the push-pull effect. Equally so, the quotient of the occupation numbers of the antibonding and bonding pi orbitals of the central C=C partial double bond ( pi*(C=C)/pi(C=C) ) could also be employed for this purpose
Y1 - 2006
UR - http://www.shd.org.rs/JSCS/
U6 - https://doi.org/10.2298/Jsc0601001k
ER -
TY - GEN
A1 - Lattemann, Christoph
A1 - Kupke, Sören
A1 - Schneider, Anna-Maria
A1 - Stieglitz, Stefan
T1 - Public Private Partnerships as an Accelerator of Broadband Diffusion? Findings from Case Studies,
Y1 - 2006
ER -
TY - BOOK
A1 - Schulze, Bert-Wolfgang
T1 - Pseudo-differential calculus on Manifolds with geometric singularities
T3 - Preprint / Universität Potsdam, Institut für Mathematik, Arbeitsgruppe Partiell
Y1 - 2006
SN - 1437-739X
PB - Univ.
CY - Potsdam
ER -
TY - INPR
A1 - Schulze, Bert-Wolfgang
T1 - Pseudo-differential calculus on manifolds with geometric singularities
N2 - Differential and pseudo-differential operators on a manifold with (regular) geometric singularities can be studied within a calculus, inspired by the concept of classical pseudo-differential operators on a C1 manifold. In the singular case the operators form an algebra with a principal symbolic hierarchy σ = (σj)0≤j≤k, with k being the order of the singularity and σk operator-valued for k ≥ 1. The symbols determine ellipticity and the nature of parametrices. It is typical in this theory that, similarly as in boundary value problems (which are special edge problems, where the edge is just the boundary), there are trace, potential and Green operators, associated with the various strata of the configuration. The operators, obtained from the symbols by various quantisations, act in weighted distribution spaces with multiple weights. We outline some essential elements of this calculus, give examples and also comment on new challenges and interesting problems of the recent development.
T3 - Preprint - (2006) 20
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-30204
ER -
TY - JOUR
A1 - Forterre, Simone
A1 - Raila, Jens
A1 - Kohn, Barbara
A1 - Brunnberg, Leo
A1 - Schweigert, Florian J.
T1 - Protein profiling of organic stone matrix and urine from dogs with urolithiasis
N2 - Two-thirds of the organic matrix in urinary stones consists of proteins. Their relationship to calculogenesis remains controversial with regard to their effect as inhibitors or promoters during stone formation. The purpose of the present study was to determine the differences in peptide and protein pattern between the urine of stone formers (n = 23) and control dogs (n = 12), as well as between organic matrix of different urinary stones (struvite n = 11, calcium oxalate n = 8, uric acid n = 4) using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry. Specific differences in protein and peptide profiles were found in the organic matrix of different mineral compositions. Characteristic differences were also found in urinary peptide and protein pattern especially in molecular masses below 20 kDa between affected and healthy dogs. Based on the obtained molecular masses they were in some cases tentatively identified as proteins that are known to be involved in stone formation in humans. The study shows that in dogs, specific-urinary peptides and proteins might be associated with urolithiasis. It indicates the importance to further characterize those proteins for possible diagnostic purposes in prognosis and therapy
Y1 - 2006
UR - http://www3.interscience.wiley.com/journal/122630496/grouphome/home.html
U6 - https://doi.org/10.1111/j.1439-0396.2005.00590.x
SN - 0931-2439
ER -
TY - BOOK
ED - Couper-Kuhlen, Elizabeth
ED - Selting, Margret
T1 - Prosody in Conversation : Interactional Studies
T3 - Studies in international sociolinguistics
Y1 - 2006
SN - 978-0-521-02410-5
VL - 12
PB - Cambridge Univ. Press
CY - Cambridge
ET - 1. publ., digitally printed 1. paperback version
ER -