@article{BrainGebserPuehreretal.2007, author = {Brain, Martin and Gebser, Martin and P{\"u}hrer, J{\"o}rg and Schaub, Torsten and Tompits, Hans and Woltran, Stefan}, title = {"That is illogical, Captain!" : the debugging support tool spock for answer-set programs ; system description}, year = {2007}, language = {en} } @article{Braun2007, author = {Braun, Jutta}, title = {"Very nice, the enemies are gone!" : coming to terms with GDR sports since 1989/90}, issn = {0172-6404}, year = {2007}, abstract = {Als die SED-Diktatur zusammenbrach, {\"u}bte der Glanz der ostdeutschen Medaillen nach wie vor eine große Anziehungskraft aus, vor allem auf westdeutsche Sportpolitiker. Der Sport war ein Spezialfall der deutschen Vereinigung, da hier der Westen vom Osten zu lernen hoffte. Bald jedoch wurden die dunklen Seiten des DDR-Sports offensichtlich: die Verstrickung mit dem Ministerium f{\"u}r Staatsicherheit ebenso wie das staatlich forcierte Zwangsdoping. Bis heute gehen die Meinungen {\"u}ber den DDR-Sport weit auseinander: w{\"a}hrend die Einen ihn als repressiv und unmenschlich verurteilen, wird er von den Anderen gleichzeitig als Organisationsvorbild f{\"u}r die Zukunft gehandelt.}, language = {en} } @article{BoechatWeithoffKruegeretal.2007, author = {Bo{\"e}chat, Iola G. and Weithoff, Guntram and Kr{\"u}ger, Angela and G{\"u}cker, Bj{\"o}rn and Adrian, Rita}, title = {A biochemical explanation for the success of the mixotrophy in the flagellate Ochromonas sp.}, issn = {0024-3590}, doi = {10.4319/lo.2007.52.4.1624}, year = {2007}, abstract = {We report the influence of different nutritional modes-autotrophy, mixotrophy, and heterotrophy-on the fatty acid and sterol composition of the freshwater flagellate Ochromonas sp. and discuss the ecological significance of our results with respect to the resource competition theory (rct). Polyunsaturated fatty acids (PUFAs) are the most efficient biochemical variable distinguishing between nutritional modes of Ochromonas sp. Decreasing concentrations of PUFAs were observed in the order autotrophs, mixotrophs, heterotrophs. In mixotrophs and heterotrophs, concentrations of saturated fatty acids were higher than those of monounsaturated fatty acids and PUFAs as a result of bacterivory. Stigmasterol was the main sterol in Ochromonas sp., regardless of nutritional mode. Mixotrophs showed higher growth rates than heterotrophs, which could not be explained by rct. Heterotrophs, in turn, exhibited higher growth rates than autotrophs, which were cultured under the same light conditions as mixotrophs. Mixotrophs can synthesize PUFAs, which are important for many physiological functions such as membrane permeability and growth. Thus, mixotrophy facilitated efficient growth as well as the ability to synthesize complex and essential biomolecules. These strong synergetic effects are due to the combination of biochemical benefits of heterotrophic and autotrophic metabolic pathways and cannot be predicted by rct.}, language = {en} } @phdthesis{ColpanZenginoglu2007, author = {Colpan Zenginoglu, Anil}, title = {A conformal approach to numerical calculations of asymptotically flat spacetimes}, address = {Potsdam}, pages = {101 S. : graph. Darst.}, year = {2007}, language = {en} } @article{DelgrandeSchaub2007, author = {Delgrande, James Patrick and Schaub, Torsten}, title = {A consistency-based framework for merging knowledge bases}, issn = {1570-8683}, year = {2007}, language = {en} } @article{FussmannWeithoffYoshida2007, author = {Fussmann, Gregor F. and Weithoff, Guntram and Yoshida, Takehito}, title = {A direct, experimental test of resource versus consumer dependence : reply}, issn = {0012-9658}, doi = {10.1890/06-1692}, year = {2007}, language = {en} } @article{DelgrandeSchaubTompits2007, author = {Delgrande, James Patrick and Schaub, Torsten and Tompits, Hans}, title = {A general framework for expressing preferences in causal reasoning and planning}, issn = {0955-792X}, doi = {10.1093/logcom/exm046}, year = {2007}, abstract = {We consider the problem of representing arbitrary preferences in causal reasoning and planning systems. In planning, a preference may be seen as a goal or constraint that is desirable, but not necessary, to satisfy. To begin, we define a very general query language for histories, or interleaved sequences of world states and actions. Based on this, we specify a second language in which preferences are defined. A single preference defines a binary relation on histories, indicating that one history is preferred to the other. From this, one can define global preference orderings on the set of histories, the maximal elements of which are the preferred histories. The approach is very general and flexible; thus it constitutes a base language in terms of which higher-level preferences may be defined. To this end, we investigate two fundamental types of preferences that we call choice and temporal preferences. We consider concrete strategies for these types of preferences and encode them in terms of our framework. We suggest how to express aggregates in the approach, allowing, e.g. the expression of a preference for histories with lowest total action costs. Last, our approach can be used to express other approaches and so serves as a common framework in which such approaches can be expressed and compared. We illustrate this by indicating how an approach due to Son and Pontelli can be encoded in our approach, as well as the language PDDL3.}, language = {en} } @phdthesis{Merlo2007, author = {Merlo, Claudia}, title = {A model of protein folding kinetics}, address = {Potsdam}, pages = {89 S. : graph. Darst.}, year = {2007}, language = {en} } @article{LeitenbergerPietsch2007, author = {Leitenberger, Wolfram and Pietsch, Ullrich}, title = {A monolithic Fresnel bimirror for hard X-rays and its application for coherence measurements}, issn = {0909-0495}, doi = {10.1107/S0909049507003846}, year = {2007}, abstract = {Experiments using a simple X-ray interferometer to measure the degree of spatial coherence of hard X-rays are reported. A monolithic Fresnel bimirror is used at small incidence angles to investigate synchrotron radiation in the energy interval 5-50 keV with monochromatic and white beam. The experimental setup was equivalent to a Young's double-slit experiment for hard X-rays with slit dimensions in the micrometre range. From the high-contrast interference pattern the degree of coherence was determined.}, language = {en} } @phdthesis{Eisinger2007, author = {Eisinger, Dirk}, title = {A new management model for developing small scale contingency plans of rabies}, address = {Potsdam}, pages = {115 S. : graph. Darst.}, year = {2007}, language = {en} } @article{DelgrandeSchaubTompits2007, author = {Delgrande, James Patrick and Schaub, Torsten and Tompits, Hans}, title = {A preference-based framework for updating logic programs}, isbn = {978-3-540- 72199-4}, year = {2007}, language = {en} } @book{PolyvyanyyKuropka2007, author = {Polyvyanyy, Artem and Kuropka, Dominik}, title = {A Quantitative Evalution of the Enhanced Topic-based Vector Space Model}, series = {Technische Berichte des Hasso-Plattner-Instituts f{\"u}r Softwaresystemtechnik an der Universit{\"a}t Potsda}, volume = {19}, journal = {Technische Berichte des Hasso-Plattner-Instituts f{\"u}r Softwaresystemtechnik an der Universit{\"a}t Potsda}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-939469-95-7}, issn = {1613-5652}, pages = {88 S.}, year = {2007}, language = {en} } @phdthesis{Kneis2007, author = {Kneis, David}, title = {A water quality model for shallow river-lake systems and its application in river basin management}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-14647}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {This work documents the development and application of a new model for simulating mass transport and turnover in rivers and shallow lakes. The simulation tool called 'TRAM' is intended to complement mesoscale eco-hydrological catchment models in studies on river basin management. TRAM aims at describing the water quality of individual water bodies, using problem- and scale-adequate approaches for representing their hydrological and ecological characteristics. The need for such flexible water quality analysis and prediction tools is expected to further increase during the implementation of the European Water Framework Directive (WFD) as well as in the context of climate change research. The developed simulation tool consists of a transport and a reaction module with the latter being highly flexible with respect to the description of turnover processes in the aquatic environment. Therefore, simulation approaches of different complexity can easily be tested and model formulations can be chosen in consideration of the problem at hand, knowledge of process functioning, and data availability. Consequently, TRAM is suitable for both heavily simplified engineering applications as well as scientific ecosystem studies involving a large number of state variables, interactions, and boundary conditions. TRAM can easily be linked to catchment models off-line and it requires the use of external hydrodynamic simulation software. Parametrization of the model and visualization of simulation results are facilitated by the use of geographical information systems as well as specific pre- and post-processors. TRAM has been developed within the research project 'Management Options for the Havel River Basin' funded by the German Ministry of Education and Research. The project focused on the analysis of different options for reducing the nutrient load of surface waters. It was intended to support the implementation of the WFD in the lowland catchment of the Havel River located in North-East Germany. Within the above-mentioned study TRAM was applied with two goals in mind. In a first step, the model was used for identifying the magnitude as well as spatial and temporal patterns of nitrogen retention and sediment phosphorus release in a 100~km stretch of the highly eutrophic Lower Havel River. From the system analysis, strongly simplified conceptual approaches for modeling N-retention and P-remobilization in the studied river-lake system were obtained. In a second step, the impact of reduced external nutrient loading on the nitrogen and phosphorus concentrations of the Havel River was simulated (scenario analysis) taking into account internal retention/release. The boundary conditions for the scenario analysis such as runoff and nutrient emissions from river basins were computed by project partners using the catchment models SWIM and ArcEGMO-Urban. Based on the output of TRAM, the considered options of emission control could finally be evaluated using a site-specific assessment scale which is compatible with the requirements of the WFD. Uncertainties in the model predictions were also examined. According to simulation results, the target of the WFD -- with respect to total phosphorus concentrations in the Lower Havel River -- could be achieved in the medium-term, if the full potential for reducing point and non-point emissions was tapped. Furthermore, model results suggest that internal phosphorus loading will ease off noticeably until 2015 due to a declining pool of sedimentary mobile phosphate. Mass balance calculations revealed that the lakes of the Lower Havel River are an important nitrogen sink. This natural retention effect contributes significantly to the efforts aimed at reducing the river's nitrogen load. If a sustainable improvement of the river system's water quality is to be achieved, enhanced measures to further reduce the immissions of both phosphorus and nitrogen are required.}, language = {en} } @article{Wacker2007, author = {Wacker, Alexander}, title = {Allocation of essential lipids in Daphnia magna during exposure to poor food quality}, doi = {10.1111/j.1365-2435.2007.01274.x}, year = {2007}, language = {en} } @article{GebserSchaubTompitsetal.2007, author = {Gebser, Martin and Schaub, Torsten and Tompits, Hans and Woltran, Stefan}, title = {Alternative characterizations for program equivalence under aswer-set semantics : a preliminary report}, year = {2007}, language = {en} } @phdthesis{Stocco2007, author = {Stocco, Antonio}, title = {Amphiphilic block copolymers at the liquid-fluid interface, invesrigated by evanescent light scattering and ellipsometry}, address = {Potsdam}, pages = {iii, 108 S. : Ill., graph. Darst.}, year = {2007}, language = {en} } @phdthesis{Popp2007, author = {Popp, Alexander}, title = {An integrated modelling approach for sustainable management of semi-arid and arid rangelands}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15103}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {The need to develop sustainable resource management strategies for semi-arid and arid rangelands is acute as non-adapted grazing strategies lead to irreversible environmental problems such as desertification and associated loss of economic support to society. In such vulnerable ecosystems, successful implementation of sustainable management strategies depends on well-founded under-standing of processes at different scales that underlay the complex system dynamic. There is ample evidence that, in contrast to traditional sectoral approaches, only interdisciplinary research does work for resolving problems in conservation and natural resource management. In this thesis I combined a range of modeling approaches that integrate different disciplines and spatial scales in order to contribute to basic guidelines for sustainable management of semi-arid and arid range-lands. Since water availability and livestock management are seen as most potent determinants for the dynamics of semi-arid and arid ecosystems I focused on (i) the interaction of ecological and hydro-logical processes and (ii) the effect of farming strategies. First, I developed a grid-based and small-scaled model simulating vegetation dynamics and inter-linked hydrological processes. The simulation results suggest that ecohydrological interactions gain importance in rangelands with ascending slope where vegetation cover serves to obstruct run-off and decreases evaporation from the soil. Disturbances like overgrazing influence these positive feedback mechanisms by affecting vegetation cover and composition. In the second part, I present a modeling approach that has the power to transfer and integrate ecological information from the small scale vegetation model to the landscape scale, most relevant for the conservation of biodiversity and sustainable management of natural resources. I combined techniques of stochastic modeling with remotely sensed data and GIS to investigate to which ex-tent spatial interactions, like the movement of surface water by run-off in water limited environments, affect ecosystem functioning at the landscape scale. My simulation experiments show that overgrazing decreases the number of vegetation patches that act as hydrological sinks and run-off increases. The results of both simulation models implicate that different vegetation types should not only be regarded as provider of forage production but also as regulator of ecosystem functioning. Vegetation patches with good cover of perennial vegetation are capable to catch and conserve surface run-off from degraded surrounding areas. Therefore, downstream out of the simulated system is prevented and efficient use of water resources is guaranteed at all times. This consequence also applies to commercial rotational grazing strategies for semi-arid and arid rangelands with ascending slope where non-degraded paddocks act as hydrological sinks. Finally, by the help of an integrated ecological-economic modeling approach, I analyzed the relevance of farmers' ecological knowledge for longterm functioning of semi-arid and arid grazing systems under current and future climatic conditions. The modeling approach consists of an ecological and an economic module and combines relevant processes on either level. Again, vegetation dynamics and forage productivity is derived by the small-scaled vegetation model. I showed that sustainable management of semi-arid and arid rangelands relies strongly on the farmers' knowledge on how the ecosystem works. Furthermore, my simulation results indicate that the projected lower annual rainfall due to climate change in combination with non-adapted grazing strategies adds an additional layer of risk to these ecosystems that are already prone to land degradation. All simulation models focus on the most essential factors and ignore specific details. Therefore, even though all simulation models are parameterized for a specific dwarf shrub savanna in arid southern Namibia, the conclusions drawn are applicable for semi-arid and arid rangelands in general.}, language = {en} } @article{EngbertNuthmannKliegl2007, author = {Engbert, Ralf and Nuthmann, Antje and Kliegl, Reinhold}, title = {An lterative algorithm for the estimation of the distribution of mislocated fixations during reading}, isbn = {978-0-08-044980-7}, year = {2007}, language = {en} } @article{Hassler2007, author = {Haßler, Gerda}, title = {Analogy : the history of a concept and a term from the 17th to the 19th century}, isbn = {978-90-272-4603-5}, year = {2007}, language = {en} } @misc{Trapp2007, type = {Master Thesis}, author = {Trapp, Matthias}, title = {Analysis and exploration of virtual 3D city models using 3D information lenses}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-13930}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {This thesis addresses real-time rendering techniques for 3D information lenses based on the focus \& context metaphor. It analyzes, conceives, implements, and reviews its applicability to objects and structures of virtual 3D city models. In contrast to digital terrain models, the application of focus \& context visualization to virtual 3D city models is barely researched. However, the purposeful visualization of contextual data of is extreme importance for the interactive exploration and analysis of this field. Programmable hardware enables the implementation of new lens techniques, that allow the augmentation of the perceptive and cognitive quality of the visualization compared to classical perspective projections. A set of 3D information lenses is integrated into a 3D scene-graph system: • Occlusion lenses modify the appearance of virtual 3D city model objects to resolve their occlusion and consequently facilitate the navigation. • Best-view lenses display city model objects in a priority-based manner and mediate their meta information. Thus, they support exploration and navigation of virtual 3D city models. • Color and deformation lenses modify the appearance and geometry of 3D city models to facilitate their perception. The presented techniques for 3D information lenses and their application to virtual 3D city models clarify their potential for interactive visualization and form a base for further development.}, language = {en} } @phdthesis{Rode2007, author = {Rode, Michael}, title = {Analysis and modelling of nutrient transport and transformation processes on the catchment scale}, address = {Potsdam}, pages = {III, 230 S.: Ill., graph. Darst.}, year = {2007}, language = {en} } @phdthesis{Rode2007, author = {Rode, Michael}, title = {Analysis and modelling of nutrient transport and transformation processes on the catchment scale}, address = {Potsdam}, pages = {230 S., I-III, graph., Darst.}, year = {2007}, language = {en} } @phdthesis{Bielecka2007, author = {Bielecka, Monika}, title = {Analysis of transcription factors under sulphur deficiency stress}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-14812}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Sulphur, a macronutrient essential for plant growth, is among the most versatile elements in living organisms. Unfortunately, little is known about regulation of sulphate uptake and assimilation by plants. Identification of sulphate signalling processes will allow to control sulphate acquisition and assimilation and may prove useful in the future to improve sulphur-use efficiency in agriculture. Many of genes involved in sulphate metabolism are regulated on transcriptional level by products of other genes called transcription factors (TF). Several published experiments revealed TF genes that respond to sulphate deprivation, but none of these have been so far been characterized functionally. Thus, we aimed at identifying and characterising transcription factors that control sulphate metabolism in the model plant Arabidopsis thaliana. To achieve that goal we postulated that factors regulating Arabidopsis responses to inorganic sulphate deficiency change their transcriptional levels under sulphur-limited conditions. By comparing TF transcript profiles from plants grown on different sulphate regimes, we identified TF genes that may specifically induce or repress changes in expression of genes that allow plants to adapt to changes in sulphate availability. Candidate genes obtained from this screening were tested by reverse genetics approaches. Transgenic plants constitutively overproducing selected TF genes and mutant plants, lacking functional selected TF genes (knock out), were used. By comparing metabolite and transcript profiles from transgenic and wild type plants we aimed at confirming the role of selected AP2 TF candidate genes in plant adaptation to sulphur unavailability. After preliminary characterisation of WRKY24 and MYB93 TF genes, we postulate that these factors are involved in a complex multifactorial regulatory network, in which WRKY24 and MYB93 would act as superior factors regulating other transcription factors directly involved in the regulation of S-metabolism genes. Results obtained for plants overproducing TOE1 and TOE2 TF genes suggests that these factors may be involved in a mechanism, which is promoting synthesis of an essential amino acid, methionine, over synthesis of another amino acid, cysteine. Thus, TOE1 and TOE2 genes might be a part of transcriptional regulation of methionine synthesis. Approaches creating genetically manipulated plants may produce plant phenotypes of immediate biotechnological interest, such as plants with increased sulphate or sulphate-containing amino acid content, or better adapted to the sulphate unavailability.}, language = {en} } @article{MuellerMeuthrath2007, author = {M{\"u}ller, Claudia and Meuthrath, Benedikt}, title = {Analyzing Wiki-based networks to improve knowledge processes in organizations}, year = {2007}, language = {en} } @book{Gronau2007, author = {Gronau, Norbert}, title = {Approach for requirement oriented team building : eChallenges 2007}, publisher = {Univ. Potsdam}, address = {Potsdam}, pages = {8 S.}, year = {2007}, language = {en} } @article{GronauFroemingSchmidetal.2007, author = {Gronau, Norbert and Fr{\"o}ming, Jane and Schmid, Simone and R{\"u}ssb{\"u}ldt, Uwe}, title = {Approach for requirement oriented team building in industrial processes}, doi = {10.1016/j.compind.2006.09.011}, year = {2007}, abstract = {This contribution presents an approach for requirement oriented team building in industrial processes like product development. This will be based on the knowledge modelling and description language (KMDL(R)) that enables the modelling and analysis of knowledge intensive business processes. First the basic elements of the modelling technique are described, presenting the concept and the description language. Furthermore it is shown how the KMDL(R) process models can be used as a basis for the team building component. Therefore, an algorithm was developed that is able to propose a team composition for a specific task by analyzing the knowledge and skills of the employees, which will be contrasted to the process requirements. This can be used as guidance for team building decisions.}, language = {en} } @phdthesis{Redestig2007, author = {Redestig, Henning}, title = {Approaches for integrative analysis of gene expression data}, address = {Potsdam}, pages = {VIII, 130 S. : Ill., graph. Darst.}, year = {2007}, language = {en} } @phdthesis{Trappmann2007, author = {Trappmann, Henryk}, title = {Arborescent numbers : higher arithmetic operations and division trees}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15247}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {The overall program "arborescent numbers" is to similarly perform the constructions from the natural numbers (N) to the positive fractional numbers (Q+) to positive real numbers (R+) beginning with (specific) binary trees instead of natural numbers. N can be regarded as the associative binary trees. The binary trees B and the left-commutative binary trees P allow the hassle-free definition of arbitrary high arithmetic operations (hyper ... hyperpowers). To construct the division trees the algebraic structure "coppice" is introduced which is a group with an addition over which the multiplication is right-distributive. Q+ is the initial associative coppice. The present work accomplishes one step in the program "arborescent numbers". That is the construction of the arborescent equivalent(s) of the positive fractional numbers. These equivalents are the "division binary trees" and the "fractional trees". A representation with decidable word problem for each of them is given. The set of functions f:R1->R1 generated from identity by taking powers is isomorphic to P and can be embedded into a coppice by taking inverses.}, language = {en} } @article{LauchtHohmEsseretal.2007, author = {Laucht, Manfred and Hohm, E. and Esser, G{\"u}nter and Schmidt, Martin H. and Becker, Katja}, title = {Association between ADHD and smoking in adolescence : shared genetic, environmental and psychopathological factors}, issn = {0300-9564}, doi = {10.1007/s00702-007-0703-y}, year = {2007}, abstract = {The present study aimed to examine the extent to which the co-occurrence of ADHD and smoking in adolescents could be attributed to common genetic, environmental and psychopathological factors. Data are from an ongoing prospective study of the outcome of early risk factors. At age 15 years, 305 adolescents completed self-report questionnaires measuring tobacco consumption and deviant peer affiliations. Lifetime psychiatric diagnoses were obtained using standardized interviews. DNA was genotyped for the dopamine D4 receptor (DRD4) gene exon III polymorphism. Adolescents with a lifetime diagnosis of ADHD displayed significantly higher smoking activity than non-ADHD controls. A major component of this association could be accounted for by deviant peer affiliations and the comorbidity with oppositional-defiant and conduct disorder, while a minor part was attributable to DRD4 in males but not in females. These findings suggest that the association of ADHD with smoking relies on risk factors shared by the two behaviors.}, language = {en} } @book{FladSchneiderSchulze2007, author = {Flad, H.-J. and Schneider, R. and Schulze, Bert-Wolfgang}, title = {Asymptotic Regularity of Solutions of Hartree-Fock Equations with Coulomb Potential}, series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik, Arbeitsgruppe Partiell}, journal = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik, Arbeitsgruppe Partiell}, publisher = {Univ.}, address = {Potsdam}, issn = {1437-739X}, pages = {26 S.}, year = {2007}, language = {en} } @phdthesis{Beyer2007, author = {Beyer, Florian}, title = {Asymptotics and singularities in cosmological models with positive cosmological constant}, address = {Potsdam}, pages = {173 S. : graph. Darst.}, year = {2007}, language = {en} } @phdthesis{Glushak2007, author = {Glushak, Ksenia}, title = {Atmospheric circulation and the surface mass balance in a regional climate model of Antarctica}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17296}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Understanding the Earth's climate system and particularly climate variability presents one of the most difficult and urgent challenges in science. The Antarctic plays a crucial role in the global climate system, since it is the principal region of radiative energy deficit and atmospheric cooling. An assessment of regional climate model HIRHAM is presented. The simulations are generated with the HIRHAM model, which is modified for Antarctic applications. With a horizontal resolution of 55km, the model has been run for the period 1958-1998 creating long-term simulations from initial and boundary conditions provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA40 re-analysis. The model output is compared with observations from observation stations, upper air data, global atmospheric analyses and satellite data. In comparison with the observations, the evaluation shows that the simulations with the HIRHAM model capture both the large and regional scale circulation features with generally small bias in the modeled variables. On the annual time scale the largest errors in the model simulations are the overestimation total cloud cover and the colder near-surface temperature over the interior of the Antarctic plateau. The low-level temperature inversion as well as low-level wind jet is well captured by the model. The decadal scale processes were studied based on trend calculations. The long-term run was divided into two 20 years parts. The 2m temperature, 500 hPa temperature, MSLP, precipitation and net mass balance trends were calculated for both periods and over 1958 - 1998. During the last two decades the strong surface cooling was observed over the Eastern Antarctica, this result is in good agreement with the result of Chapman and Walsh (2005) who calculated the temperature trend based on the observational data. The MSLP trend reveals a big disparity between the first and second parts of the 40 year run. The overall trend shows the strengthening of the circumpolar vortex and continental anticyclone. The net mass balance as well as precipitation show a positive trend over the Antarctic Peninsula region, along Wilkes Land and in Dronning Maud Land. The Antarctic ice sheet grows over the Eastern part of Antarctica with small exceptions in Dronning Maud Land and Wilkes Land and sinks in the Antarctic Peninsula; this result is in good agreement with the satellite-measured altitude presented in Davis (2005) . To better understand the horizontal structure of MSLP, temperature and net mass balance trends the influence of the Southern Annual Mode (SAM) on the Antarctic climate was investigated. The main meteorological parameters during the positive and negative Antarctic Oscillation (AAO) phases were compared to each other. A positive/negative AAO index means strengthening/weakening of the circumpolar vortex, poleward/northward storm tracks and prevailing/weakening westerly winds. For detailed investigation of global teleconnection, two positive and one negative periods of AAO phase were chosen. The differences in MSLP and 2m temperature between positive and negative AAO years during the winter months partly explain the surface cooling during the last decades.}, language = {en} } @article{TinoCacciapuotiBongsetal.2007, author = {Tino, G. M. and Cacciapuoti, L. and Bongs, K. and Bord{\´e}, Ch. J. and Bouyer, P. and Dittus, H. and Ertmer, W. and G{\"o}rlitz, A. and Inguscio, M. and Landragin, A. and Lemonde, P. and L{\"a}mmerzahl, C. and Peters, A. and Rasel, E. and Reichel, J. and Salomon, C. and Schiller, S. and Schleich, W. and Sengstock, K. and Sterr, U. and Wilkens, Martin}, title = {Atom interferometers and optical atomic clocks : new quantum sensors for fundamental physics experiments in space}, year = {2007}, abstract = {We present projects for future space missions using new quantum devices based on ultracold atoms. They will enable fundamental physics experiments testing quantum physics, physics beyond the standard model of fundamental particles and interactions, special relativity, gravitation and general relativity.}, language = {en} } @article{QiuMellingerWegeneretal.2007, author = {Qiu, Xunlin and Mellinger, Axel and Wegener, Michael and Wirges, Werner and Gerhard, Reimund}, title = {Barrier discharges in cellular polypropylene ferroelectrets : how do they influence the electromechanical properties?}, year = {2007}, language = {en} } @article{Clegg2007, author = {Clegg, Mark R.}, title = {Behavioral response as a predictor of seasonal depth distribution and vertical niche separation in freshwater phytoplanktonic flagellates}, year = {2007}, language = {en} } @article{DelgrandeLangSchaub2007, author = {Delgrande, James Patrick and Lang, J{\´e}r{\^o}me and Schaub, Torsten}, title = {Belief change based on global minimisation}, year = {2007}, language = {en} } @book{MargariaKubczakSteffen2007, author = {Margaria, Tiziana and Kubczak, Christian and Steffen, Bernhard}, title = {Bio-jETI: a Service Integration, Design, and Provisioning Platform for Orchestrated Bioinformatics Processes - ("part of From Components to Processes")}, series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Informatik}, volume = {2007, 4}, journal = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Informatik}, publisher = {Univ.}, address = {Potsdam}, issn = {0946-7580}, pages = {16 S.}, year = {2007}, language = {en} } @misc{Schroeder2007, author = {Schroeder, Christoph}, title = {Boeschoten, H., Johanson, L. (Hrsg.), Turkic languages in contact; Wiesbaden, Harrassowitz, 2006}, year = {2007}, language = {en} } @misc{Wickert2007, type = {Master Thesis}, author = {Wickert, Claudia}, title = {Breeding white storks in former East Prussia : comparing predicted relative occurrences across scales and time using a stochastic gradient boosting method (TreeNet), GIS and public data}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-13532}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {In dieser Arbeit wurden verschiedene GIS-basierte Habitatmodelle f{\"u}r den Weißstorch (Ciconia ciconia) im Gebiet der ehemaligen deutschen Provinz Ostpreußen (ca. Gebiet der russischen Exklave Kaliningrad und der polnischen Woiwodschaft Ermland-Masuren) erstellt. Zur Charakterisierung der Beziehung zwischen dem Weißstorch und der Beschaffenheit seiner Umwelt wurden verschiedene historische Datens{\"a}tze {\"u}ber den Bestand des Weißstorches in den 1930er Jahren sowie ausgew{\"a}hlte Variablen zur Habitat-Beschreibung genutzt. Die Aufbereitung und Modellierung der verwendeten Datens{\"a}tze erfolgte mit Hilfe eines geographischen Informationssystems (ArcGIS) und einer statistisch-mathematischen Methode aus den Bereichen „Machine Learning" und „Data-Mining" (TreeNet, Salford Systems Ltd.). Unter Verwendung der historischen Habitat-Parameter sowie der Daten zum Vorkommen des Weißstorches wurden quantitative Modelle auf zwei Maßstabs-Ebenen erstellt: (i) auf Punktskala unter Verwendung eines Rasters mit einer Zellgr{\"o}ße von 1 km und (ii) auf Verwaltungs-Kreisebene basierend auf der Gliederung der Provinz Ostpreußen in ihre Landkreise. Die Auswertung der erstellten Modelle zeigt, dass das Vorkommen von Storchennestern im ehemaligen Ostpreußen, unter Ber{\"u}cksichtigung der hier verwendeten Variablen, maßgeblich durch die Variablen ‚forest', ‚settlement area', ‚pasture land' und ‚coastline' bestimmt wird. Folglich l{\"a}sst sich davon ausgehen, dass eine gute Nahrungsverf{\"u}gbarkeit, wie der Weißstorch sie auf Wiesen und Weiden findet, sowie die N{\"a}he zu menschlichen Siedlungen ausschlaggebend f{\"u}r die Nistplatzwahl des Weißstorches in Ostpreußen sind. Geschlossene Waldgebiete zeigen sich in den Modellen als Standorte f{\"u}r Horste des Weißstorches ungeeignet. Der starke Einfluss der Variable ‚coastline' l{\"a}sst sich h{\"o}chstwahrscheinlich durch die starke naturr{\"a}umliche Gliederung Ostpreußens parallel zur K{\"u}stenlinie erkl{\"a}ren. In einem zweiten Schritt konnte unter Verwendung der in dieser Arbeit erstellten Modelle auf beiden Skalen Vorhersagen f{\"u}r den Zeitraum 1981-1993 getroffen werden. Dabei wurde auf dem Punktmaßstab eine Abnahme an potentiellem Bruthabitat vorhergesagt. Im Gegensatz dazu steigt die vorhergesagte Weißstorchdichte unter Verwendung des Modells auf Verwaltungs-Kreisebene. Der Unterschied zwischen beiden Vorhersagen beruht vermutlich auf der Verwendung unterschiedlicher Skalen und von zum Teil voneinander verschiedenen erkl{\"a}renden Variablen. Weiterf{\"u}hrende Untersuchungen sind notwendig, um diesen Sachverhalt zu kl{\"a}ren. Des Weiteren konnten die Modellvorhersagen f{\"u}r den Zeitraum 1981-1993 mit den vorliegenden Bestandserfassungen aus dieser Zeit deskriptiv verglichen werden. Es zeigt sich hierbei, dass die hier vorhergesagten Bestandszahlen h{\"o}her sind als die in den Z{\"a}hlungen ermittelten. Die hier erstellten Modelle beschreiben somit vielmehr die Kapazit{\"a}t des Habitats. Andere Faktoren, die die Gr{\"o}ße der Weißstorch-Population bestimmen, wie z.B. Bruterfolg oder Mortalit{\"a}t sollten in zuk{\"u}nftige Untersuchungen mit einbezogen werden. Es wurde ein m{\"o}glicher Ansatz aufgezeigt, wie man mit den hier vorgestellten Methoden und unter Verwendung historischer Daten wertvolle Habitatmodelle erstellen sowie die Auswirkung von Landnutzungs{\"a}nderungen auf den Weißstorch beurteilen kann. Die hier erstellten Modelle sind als erste Grundlage zu sehen und lassen sich mit Hilfe weitere Daten hinsichtlich Habitatstruktur und mit exakteren r{\"a}umlich expliziten Angaben zu Neststandorten des Weißstorches weiter verfeinern. In einem weiteren Schritt sollte außerdem ein Habitatmodell f{\"u}r die heutige Zeit erstellt werden. Dadurch w{\"a}re ein besserer Vergleich m{\"o}glich hinsichtlich erdenklicher Auswirkungen von {\"A}nderungen der Landnutzung und relevanten Umweltbedingungen auf den Weißstorch im Gebiet des ehemaligen Ostpreußens sowie in seinem gesamten Verbreitungsgebiet.}, language = {en} } @book{Weske2007, author = {Weske, Mathias}, title = {Business Process Management : Concepts, Languages, Architectures}, publisher = {Springer-Verlag Berlin Heidelberg}, address = {Berlin, Heidelberg}, isbn = {978-3-540-73521-2}, doi = {10.1007/978-3-540-73522-9}, pages = {368 S.}, year = {2007}, language = {en} } @article{YonedaLealSeidletal.2007, author = {Yoneda, Julliane Diniz and Leal, Katia Zaccur and Seidl, Peter Rudolf and Azeredo, Rodrigo Bagueira de V. and Kleinpeter, Erich}, title = {Camphor : a good model for illustrating NMR techniques}, year = {2007}, abstract = {CAMPHOR: A GOOD MODEL FOR ILLUSTRATING NMR TECHNIQUES. The use of Nuclear Magnetic Resonance spectroscopy to establish the three-dimensional structures of molecules is an important component of modern Chemistry courses. The combination of techniques that can be used for this purpose is conveniently illustrated by their application to the camphor molecule. This paper presents applications of several techniques used in NMR spectral interpretation in an increasing order of complexity. The result of individual experiments is illustrated in order to familiarize the user with the way connectivity through bonds and through space is established from 1D/2D-NMR spectra and molecular stereochemistry is determined from different NMR experiments}, language = {en} } @phdthesis{Ratzka2007, author = {Ratzka, Antje}, title = {Cell wall biosynthesis and metabolism in tomato fruit}, address = {Potsdam}, pages = {VII, 88 S. : graph. Darst.}, year = {2007}, language = {en} } @article{FangWegenerWirgesetal.2007, author = {Fang, Peng and Wegener, Michael and Wirges, Werner and Gerhard, Reimund and Zirkel, Larissa}, title = {Cellular polyethylene-naphthalate ferroelectrets : foaming in supercritical carbon dioxide, structural and electrical preparation, and resulting piezoelectricity}, issn = {0003-6951}, doi = {10.1063/1.2738365}, year = {2007}, abstract = {Polymer foams with electrically charged cellular voids, the so-called ferroelectrets, are soft piezoelectric transducer materials. Several polymers such as polyethylene terephthalate or cyclo-olefin copolymers are under investigation with respect to their suitability as ferroelectrets. Here, the authors report an additional ferroelectret polymer, cellular polyethylene-naphthalate (PEN), which was prepared from commercial uniform polymer films by means of foaming in supercritical carbon dioxide, inflation, biaxial stretching, electrical charging, and metallization. Piezoelectric d(33) coefficients of up to 140 pC/N demonstrate the suitability of such cellular PEN films for transducer applications. Their piezoelectricity is partially stable at elevated temperatures as high as 100 degrees C.}, language = {en} } @article{FritzLoksteinHackenbergetal.2007, author = {Fritz, Markus and Lokstein, Heiko and Hackenberg, Dieter and Welti, Ruth and Roth, Mary and Z{\"a}hringer, Ulrich and Fulda, Martin and Hellmeyer, Wiebke and Ott, Claudia and Wolter, Frank P. and Heinz, Ernst}, title = {Channeling of eukaryotic diacylglycerol into the biosynthesis of plastidial phosphatidylglycerol}, issn = {0021-9258}, doi = {10.1074/jbc.M606295200}, year = {2007}, abstract = {Plastidial glycolipids contain diacylglycerol (DAG) moieties, which are either synthesized in the plastids (prokaryotic lipids) or originate in the extraplastidial compartment (eukaryotic lipids) necessitating their transfer into plastids. In contrast, the only phospholipid in plastids, phosphatidylglycerol (PG), contains exclusively prokaryotic DAG backbones. PG contributes in several ways to the functions of chloroplasts, but it is not known to what extent its prokaryotic nature is required to fulfill these tasks. As a first step toward answering this question, we produced transgenic tobacco plants that contain eukaryotic PG in thylakoids. This was achieved by targeting a bacterial DAG kinase into chloroplasts in which the heterologous enzyme was also incorporated into the envelope fraction. From lipid analysis we conclude that the DAG kinase phosphorylated eukaryotic DAG forming phosphatidic acid, which was converted into PG. This resulted in PG with 2-3 times more eukaryotic than prokaryotic DAG backbones. In the newly formed PG the unique Delta 3-trans-double bond, normally confined to 3-transhexadecenoic acid, was also found in sn-2- bound cis-unsaturated C18 fatty acids. In addition, a lipidomics technique allowed the characterization of phosphatidic acid, which is assumed to be derived from eukaryotic DAG precursors in the chloroplasts of the transgenic plants. The differences in lipid composition had only minor effects on measured functions of the photosynthetic apparatus, whereas the most obvious phenotype was a significant reduction in growth.}, language = {en} } @phdthesis{Sapei2007, author = {Sapei, Lanny}, title = {Characterisation of silica in Equisetum hyemale and its transformation into biomorphous ceramics}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15883}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Equisetum spp. (horsetail / "Schachtelhalm") is the only surviving genus of the primitive Sphenopsids vascular plants which reached their zenith during the Carboniferous era. It is an herbaceous plant and is distinguished by jointed stems with fused whorl of nodal leaves. The plant has been used for scouring kitchen utensils and polishing wood during the past time due to its high silica encrustations in the epidermis. Equisetum hyemale (scouring rush) can accumulate silica up to 16\% dry weight in its tissue, which makes this plant an interesting candidate as a renewable resource of silica for the synthesis of biomorphous ceramics. The thesis comprises a comprehensive experimental study of silica accumulations in E.hyemale using different characterisation techniques at all hierarchical levels. The obtained results shed light on the local distribution, chemical form, crystallinity, and nanostructure of biogenic silica in E.hyemale which were quite unclear until now. Furthermore, isolation of biogenic silica from E.hyemale to obtain high grade mesoporous silica with high purity is investigated. Finally, syntheses of silicon carbide (b-SiC) by a direct thermoconversion process of E.hyemale is attempted, which is a promising material for high performance ceramics. It is found that silica is deposited continuously on the entire epidermal layer with the highest concentration on the knobs. The highest silicon content is at the knob tips (≈ 33\%), followed by epidermal flank (≈ 17\%), and inner lower knob (≈ 6\%), whereas there is almost no silicon found in the interior parts. Raman spectroscopy reveals the presence of at least two silica modifications in E.hyemale. The first type is pure hydrated amorphous silica restricted to the knob tips. The second type is accumulated on the entire continuous outer layer adjacent to the epidermis cell walls. It is lacking silanol groups and is intimately associated with polysaccharides (cellulose, hemicellulose, pectin) and inorganic compounds. Silica deposited in E.hyemale is found to be mostly amorphous with almost negligible amounts of crystalline silica in the form of a-quartz (< 7\%). The silica primary particles have a plate-like shape with a thickness of about 2 nm. Pure mesoporous amorphous silica with an open surface area up to 400 m2/g can be obtained from E.hyemale after leaching the plant with HCl to remove the inorganic impurities followed by a calcination treatment. The optimum calcination temperature appears to be around 500°C. Calcination of untreated E.hyemale causes a collapse of the biogenic silica structure which is mainly attributed to the detrimental action of alkali ions present in the native plant. Finally, pure b-SiC with a surface area of about 12 m2/g is obtained upon direct pyrolysis of HCl-treated E.hyemale samples in argon atmosphere. The original structure of native E.hyemale is substantially retained in the biomorphous b-SiC. The results of this thesis lead to a better understanding of the silicification process and allow to draw conclusions about the role of silica in E.hyemale. In particular, a templating role of the plant biopolymers for the synthesis of the nanostructured silica within the plant body can be deduced. Moreover, the high grade ultrafine amorphous silica isolated from E.hyemale promises applications as adsorbent and catalyst support and as silica source for the fabrication of silica-based composites. The synthesis of biomorphous b-SiC from sustainable and low-cost E.hyemale is still in its initial stage. The present thesis demonstrates the principal possibility of carbothermal synthesis of SiC from E.hyemale with the prospect of potential applications, for instance as refractory materials, catalyst supports, or high performance advanced ceramics.}, language = {en} } @article{WegenerWirgesPaajanenetal.2007, author = {Wegener, Michael and Wirges, Werner and Paajanen, Mika and Gerhard, Reimund}, title = {Charging behaviour and thermal stability of porous and non-porous polytetrafluoroethylene (PTFE) electrets}, isbn = {978-1-4244-1482-6}, year = {2007}, language = {en} } @article{MontanariFabianiCianietal.2007, author = {Montanari, Gian Carlo and Fabiani, Davide and Ciani, Franco and Motori, Antonio and Paajanen, Mika and Gerhard, Reimund and Wegener, Michael}, title = {Charging properties and time-temperature stability of innovative polymeric cellular ferroelectrets}, issn = {1070-9878}, doi = {10.1109/TDEI.2007.302892}, year = {2007}, abstract = {After appropriate mechanical and electrical treatments, some cellular polymers become able to retain space charge for a long time, i.e. they acquire electret behavior. The electrical treatment consists of charging under high levels of DC electric field. The mechanical treatment, based on the application of stretching forces to cellular polymer slabs that were before expanded under pressurized gas, affects the cavity size and shape, and therefore also the effectiveness of the charging process itself. An investigation of charging mechanisms, as well as of mechanical treatment, is therefore fundamental for optimizing the ferro- and piezo-electret properties. The aim of this paper is to discuss the effect of the physical dimension of the cavities on the charging behavior of cellular ferroelectrets and to focus on the time-temperature stability for two families of polymeric cellular ferroelectrets based on polypropylene (PP) and on a cyclo-olefin copolymer (COC). Emphasis will be given to the stretching process and in particular to the expansion rate applied during the manufacturing process (which affects the radial dimension and the height of the cavities, respectively). Space-charge and partial-discharge measurements as a function of time and temperature are the main tools to infer the influence of the cavity size on charging and stability characteristics.}, language = {en} } @article{MishraBhatSeckler2007, author = {Mishra, Rajesh and Bhat, Rajiv and Seckler, Robert}, title = {Chemical chaperone mediated protein folding : stabilization of P22 tailspike folding intermediates by glycerol}, issn = {1431-6730}, year = {2007}, language = {en} } @article{PrengelOverwien2007, author = {Prengel, Annedore and Overwien, Bernd}, title = {Children and the Rights to Education}, year = {2007}, language = {en} } @article{LawatscheckAleksaiteSchenketal.2007, author = {Lawatscheck, Robert and Aleksaite, Egle and Schenk, J{\"o}rg A. and Micheel, Burkhard and Jandrig, Burkhard and Holland, Gudrun and Sasnauskas, Kestutius and Gedvilaite, Alma and Ulrich, Rainer G{\"u}nter}, title = {Chimeric polyomavirus-derived virus-like particles : the immunogenicity of an inserted peptide applied without adjuvant to mice depends on its insertion site and its flanking linker sequence}, issn = {0882-8245}, doi = {10.1089/vim.2007.0023}, year = {2007}, abstract = {We inserted the sequence of the carcinoembryonic antigen-derived T cell epitope CAP-1-6D (CEA) into different positions of the hamster polyomavirus major capsid protein VP1. Independently from additional flanking linkers, yeast- expressed VP1 proteins harboring the CEA insertion between VP1 amino acid residues 80 and 89 (site 1) or 288 and 295 (site 4) or simultaneously at both positions assembled to chimeric virus-like particles (VLPs). BALB/c mice immunized with adjuvant-free VLPs developed VP1- and epitope-specific antibodies. The level of the CEA-specific antibody response was determined by the insertion site, the number of inserts, and the flanking linker. The strongest CEA-specific antibody response was observed in mice immunized with VP1 proteins harboring the CEA insert at site 1. Moreover, the CEA- specific antibodies in these mice were still detectable 6 mo after the final booster immunization. Our results indicate that hamster polyomavirus-derived VLPs represent a highly immunogenic carrier for foreign insertions that might be useful for clinical and therapeutic applications.}, language = {en} } @phdthesis{Makuch2007, author = {Makuch, Martin}, title = {Circumplanetary dust dynamics : application to Martian dust tori and Enceladus dust plumes}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-14404}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Our Solar system contains a large amount of dust, containing valuable information about our close cosmic environment. If created in a planet's system, the particles stay predominantly in its vicinity and can form extended dust envelopes, tori or rings around them. A fascinating example of these complexes are Saturnian rings containing a wide range of particles sizes from house-size objects in the main rings up to micron-sized grains constituting the E ring. Other example are ring systems in general, containing a large fraction of dust or also the putative dust-tori surrounding the planet Mars. The dynamical life'' of such circumplanetary dust populations is the main subject of our study. In this thesis a general model of creation, dynamics and death'' of circumplanetary dust is developed. Endogenic and exogenic processes creating dust at atmosphereless bodies are presented. Then, we describe the main forces influencing the particle dynamics and study dynamical responses induced by stochastic fluctuations. In order to estimate the properties of steady-state population of considered dust complex, the grain mean lifetime as a result of a balance of dust creation, life'' and loss mechanisms is determined. The latter strongly depends on the surrounding environment, the particle properties and its dynamical history. The presented model can be readily applied to study any circumplanetary dust complex. As an example we study dynamics of two dust populations in the Solar system. First we explore the dynamics of particles, ejected from Martian moon Deimos by impacts of micrometeoroids, which should form a putative tori along the orbit of the moon. The long-term influence of indirect component of radiation pressure, the Poynting-Robertson drag gives rise in significant change of torus geometry. Furthermore, the action of radiation pressure on rotating non-spherical dust particles results in stochastic dispersion of initially confined ensemble of particles, which causes decrease of particle number densities and corresponding optical depth of the torus. Second, we investigate the dust dynamics in the vicinity of Saturnian moon Enceladus. During three flybys of the Cassini spacecraft with Enceladus, the on-board dust detector registered a micron-sized dust population around the moon. Surprisingly, the peak of the measured impact rate occurred 1 minute before the closest approach of the spacecraft to the moon. This asymmetry of the measured rate can be associated with locally enhanced dust production near Enceladus south pole. Other Cassini instruments also detected evidence of geophysical activity in the south polar region of the moon: high surface temperature and extended plumes of gas and dust leaving the surface. Comparison of our results with this in situ measurements reveals that the south polar ejecta may provide the dominant source of particles sustaining the Saturn's E ring.}, language = {en} } @article{GebserKaufmannNeumannetal.2007, author = {Gebser, Martin and Kaufmann, Benjamin and Neumann, Andr{\´e} and Schaub, Torsten}, title = {Clasp : a conflict-driven answer set solver}, isbn = {978-3-540- 72199-4}, year = {2007}, language = {en} } @phdthesis{Wilhelm2007, author = {Wilhelm, Susann}, title = {Climate induced impacts on lake functioning in summer}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-14599}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Es gibt bereits viele Hinweise daf{\"u}r, dass Seen sehr sensibel auf die anthropogen verursachte Klimaerw{\"a}rmung reagiert haben. Bis jetzt haben sich die Studien der Klimafolgenforschung haupts{\"a}chlichst auf die Auswirkungen der Erw{\"a}rmung im Winter und Fr{\"u}hling konzentriert. {\"U}ber den Einfluss der Klimaerw{\"a}rmung auf Seen in den gem{\"a}ßigten Breiten im Sommer ist weniger bekannt. In der vorliegenden Doktorarbeit habe ich einige Faktoren, welche die Reaktion von Seen auf die Erw{\"a}rmung im Sommer vermutlich stark mitbestimmt haben, untersucht. Der Schwerpunkt lag dabei auf klimatisch induzierten Auswirkungen auf die thermische Charakteristik und die Ph{\"a}nologie und Abundanz des Planktons eines flachen und polymiktischen Sees (M{\"u}ggelsee, Berlin). Zuerst wurde der Einfluss der Klimaerw{\"a}rmung auf die Ph{\"a}nologie und Abundanz des Planktons in verschiedenen Jahreszeiten untersucht. Das schnellwachsende Phyto- und Zooplankton (Daphnia) im Fr{\"u}hjahr hat sich vorwiegend synchron vorverschoben, wohingegen Ver{\"a}nderungen des Sommerzooplanktons deutlich artspezifisch und nicht synchron waren. Die Ph{\"a}nologie oder Abundanz einiger Sommercopepoden hat sich entsprechend der individuellen thermischen Anforderungen innerhalb bestimmter Entwicklungsstufen, wie zum Beispiel der Emergenz von der Diapause im Fr{\"u}hling, ver{\"a}ndert. Die Studie unterstreicht, dass nicht nur der Grad der Erw{\"a}rmung, sondern auch dessen Zeitpunkt innerhalb des Jahres von großer {\"o}kologischer Bedeutung ist. Um die Auswirkungen des Klimawandels auf die thermischen Eigenschaften des Sees zu erforschen, habe ich die Langzeitentwicklung der t{\"a}glichen epilimnischen Temperaturextrema w{\"a}hrend des Sommers untersucht. Durch diese Studie wurde zum ersten Mal f{\"u}r Seen gezeigt, dass die t{\"a}glichen epilimnischen Minima (Nacht) st{\"a}rker angestiegen sind als die Maxima (Tag), wodurch sich der t{\"a}gliche epilimnische Temperaturbereich deutlich verringert hat. Diese Tag-Nacht-Asymmetrie in der epilimnischen Temperatur wurde durch eine erh{\"o}hte Emission von Langwellenstrahlung aus der Atmosph{\"a}re w{\"a}hrend der Nacht verursacht. Dies unterstreicht, dass nicht nur Erh{\"o}hungen der Lufttemperatur, sondern auch {\"A}nderungen anderer meteorologischer Variablen wie der Windgeschwindigkeit, der Luftfeuchte und der Bew{\"o}lkung eine wichtige Rolle bei der Bestimmung der Seetemperatur im Hinblick auf weitere Klimaver{\"a}nderungen spielen werden. Zudem wurde eine Kurzzeitanalyse zum Schichtungsverhalten des polymiktischen Sees durchgef{\"u}hrt, um die H{\"a}ufigkeit und Dauer von Schichtungsereignissen und deren Einfluss auf den gel{\"o}sten Sauerstoff, die gel{\"o}sten N{\"a}hrstoffe und das Phytoplankton zu untersuchen. Selbst w{\"a}hrend der l{\"a}ngsten Schichtungsereignisse (Hitzewellen 2003 und 2006) unterschieden sich die Auswirkungen auf den See von denen, welche in flachen dimiktischen Seen w{\"a}hrend der kontinuierlichen Sommerschichtung auftreten. Die hypolimnische Temperatur war h{\"o}her, was die Sauerstoffzehrung und die Akkumulation von gel{\"o}sten N{\"a}hrstoffen beg{\"u}nstigt hat. Die thermische Schichtung wird in Zukunft sehr wahrscheinlich zunehmen. Dies l{\"a}sst darauf schließen, dass polymiktische Seen sehr anf{\"a}llig gegen{\"u}ber {\"A}nderungen im Hinblick auf projizierte Klimaver{\"a}nderungen sein werden. Abschließend wurde eine Studie {\"u}ber Lang- und Kurzzeitver{\"a}nderungen in der Entwicklung der planktischen Larven der Muschel Dreissena polymorpha durchgef{\"u}hrt, um den Einfluss der Ver{\"a}nderungen im thermischen und trophischen Regime des Sees zu analysieren. Die Klimaerw{\"a}rmung und die Verringerung in der externen N{\"a}hrstofffracht haben die Abundanz der Larven stark beeinflusst indem sie jeweils auf bestimmte Entwicklungsphasen dieser Art w{\"a}hrend der warmen Jahreszeiten gewirkt haben. Der Anstieg in der Abundanz und der L{\"a}nge der Larven stand im Zusammenhang mit dem R{\"u}ckgang der N{\"a}hrstofffracht und der Ver{\"a}nderung der Phytoplanktonzusammensetzung. Die Hitzewellen in den Jahren 2003 und 2006 haben diesen positiven Effekt auf die Larvenabundanz jedoch durch ung{\"u}nstige Sauerstoffkonzentrationen w{\"a}hrend der sehr langen Schichtung aufgehoben. Die Klimaerw{\"a}rmung kann demzufolge entgegenwirkende Effekte in produktiven flachen Seen, in welchen die externe N{\"a}hrstofffracht reduziert wurde, ausl{\"o}sen. Aus diesen Ergebnissen schließe ich, dass nicht nur die Art des Klimawandels und damit der Zeitpunkt der Erw{\"a}rmung und das Auftreten von Extremen wie Hitzewellen, sondern auch standortspezifische Bedingungen wie Schichtungsverhalten und Trophiegrad entscheidende Faktoren sind, welche die Auswirkungen der Klimaerw{\"a}rmung auf interne Seeprozesse im Sommer bestimmen. Somit sollte sich die weiterf{\"u}hrende Klimafolgenforschung f{\"u}r Seen darauf konzentrieren, wie verschiedene Seetypen auf die komplexen Umweltver{\"a}nderungen im Sommer reagieren, damit ein umfassenderes Verst{\"a}ndnis {\"u}ber den Einfluss von anthropogen verursachten Ver{\"a}nderungen auf Seen der gem{\"a}ßigten Breiten erreicht wird.}, language = {en} } @phdthesis{Jampachon2007, author = {Jampachon, Prakit}, title = {Clones of terms and M-solid varieties}, address = {Potsdam}, pages = {VIII, 93 S. : graph. Darst.}, year = {2007}, language = {en} } @phdthesis{Hoffmann2007, author = {Hoffmann, Toni}, title = {Cloning and characterisation of the HMA3 gene and its promoter from Arabidopsis halleri (L.) O'Kane and Al'Shehbaz and Arabidopsis thaliana (L.) Heynhold}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15259}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Being living systems unable to adjust their location to changing environmental conditions, plants display homeostatic networks that have evolved to maintain transition metal levels in a very narrow concentration range in order to avoid either deficiency or toxicity. Hence, plants possess a broad repertoire of mechanisms for the cellular uptake, compartmentation and efflux, as well as for the chelation of transition metal ions. A small number of plants are hypertolerant to one or a few specific transition metals. Some metal tolerant plants are also able to hyperaccumulate metal ions. The Brassicaceae family member Arabidopis halleri ssp. halleri (L.) O´KANE and AL´SHEHBAZ is a hyperaccumulator of zinc (Zn), and it is closely related to the non-hypertolerant and non-hyperaccumulating model plant Arabidopsis thaliana (L.) HEYNHOLD. The close relationship renders A. halleri a promising emerging model plant for the comparative investigation of the molecular mechanisms behind hypertolerance and hyperaccumulation. Among several potential candidate genes that are probably involved in mediating the zinc-hypertolerant and zinc-hyperaccumulating trait is AhHMA3. The AhHMA3 gene is highly similar to AtHMA3 (AGI number: At4g30120) in A. thaliana, and its encoded protein belongs to the P-type IB ATPase family of integral membrane transporter proteins that transport transition metals. In contrast to the low AtHMA3 transcript levels in A. thaliana, the gene was found to be constitutively highly expressed across different Zn treatments in A. halleri, especially in shoots. In this study, the cloning and characterisation of the HMA3 gene and its promoter from Arabidopsis halleri (L.) O´KANE and AL´SHEHBAZ and Arabidopsis thaliana (L.) HEYNHOLD is described. Heterologously expressed AhHMA3 mediated enhanced tolerance to Zn and to a much lesser degree to cadmium (Cd) but not to cobalt (Co) in metal-sensitive mutant strains of budding yeast. It is demonstrated that the genome of A. halleri contains at least four copies of AhHMA3, AhHMA3-1 to AhHMA3-4. A copy-specific real-time RT-PCR indicated that an AhHMA3-1 related gene copy is the source of the constitutively high transcript level in A. halleri and not a gene copy similar to AhHMA3-2 or AhHMA3-4. In accordance with the enhanced AtHMA3mRNA transcript level in A. thaliana roots, an AtHMA3 promoter-GUS gene construct mediated GUS activity predominantly in the vascular tissues of roots and not in shoots. However, the observed AhHMA3-1 and AhHMA3-2 promoter-mediated GUS activity in A. thaliana or A. halleri plants did not reflect the constitutively high expression of AhHMA3 in shoots of A. halleri. It is suggested that other factors e. g. characteristic sequence inserts within the first intron of AhHMA3-1 might enable a constitutively high expression. Moreover, the unknown promoter of the AhHMA3-3 gene copy could be the source of the constitutively high AhHMA3 transcript levels in A. halleri. In that case, the AhHMA3-3 sequence is predicted to be highly homologous to AhHMA3-1. The lack of solid localisation data for the AhHMA3 protein prevents a clear functional assignment. The provided data suggest several possible functions of the AhHMA3 protein: Like AtHMA2 and AtHMA4 it might be localised to the plasma membrane and could contribute to the efficient translocation of Zn from root to shoot and/or to the cell-to-cell distribution of Zn in the shoot. If localised to the vacuolar membrane, then a role in maintaining a low cytoplasmic zinc concentration by vacuolar zinc sequestration is possible. In addition, AhHMA3 might be involved in the delivery of zinc ions to trichomes and mesophyll leaf cells that are major zinc storage sites in A. halleri.}, language = {en} } @article{SellrieSchenkBehrsingetal.2007, author = {Sellrie, Frank and Schenk, J{\"o}rg A. and Behrsing, Olaf and Drechsel, Oliver and Micheel, Burkhard}, title = {Cloning and characterization of a single chain antibody to glucose oxidase from a murine hybridoma}, year = {2007}, abstract = {Glucose oxidase (GOD) is an oxidoreductase catalyzing the reaction of glucose and oxygen to peroxide and gluconolacton (EC 1.1.3.4.). GOD is a widely used enzyme in biotechnology. Therefore the production of monoclonal antibodies and antibody fragments to GOD are of interest in bioanalytics and even tumor therapy. We describe here the generation of a panel of monoclonal antibodies to native and heat inactivated GOD. One of the hybridomas, E13BC8, was used for cloning of a single chain antibody (scFv). This scFv was expressed in Escherichia coli XL1-blue with the help of the vector system pOPE101. The scFv was isolated from the periplasmic fraction and detected by western blotting. It reacts specifically with soluble active GOD but does not recognize denatured GOD adsorbed to the solid phase. The same binding properties were also found for the monoclonal antibody E13BC8.}, language = {en} } @inproceedings{OPUS4-1574, title = {Clumping in hot-star winds : proceedings of an international workshop held in Potsdam, Germany, 18. - 22. June 2007}, editor = {Hamann, Wolf-Rainer and Feldmeier, Achim and Oskinova, Lidia M.}, publisher = {Universit{\"a}tsverlag Potsdam}, address = {Potsdam}, isbn = {978-3-940793-33-1}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-13981}, pages = {254}, year = {2007}, abstract = {Stellar winds play an important role for the evolution of massive stars and their cosmic environment. Multiple lines of evidence, coming from spectroscopy, polarimetry, variability, stellar ejecta, and hydrodynamic modeling, suggest that stellar winds are non-stationary and inhomogeneous. This is referred to as 'wind clumping'. The urgent need to understand this phenomenon is boosted by its far-reaching implications. Most importantly, all techniques to derive empirical mass-loss rates are more or less corrupted by wind clumping. Consequently, mass-loss rates are extremely uncertain. Within their range of uncertainty, completely different scenarios for the evolution of massive stars are obtained. Settling these questions for Galactic OB, LBV and Wolf-Rayet stars is prerequisite to understanding stellar clusters and galaxies, or predicting the properties of first-generation stars. In order to develop a consistent picture and understanding of clumped stellar winds, an international workshop on 'Clumping in Hot Star Winds' was held in Potsdam, Germany, from 18. - 22. June 2007. About 60 participants, comprising almost all leading experts in the field, gathered for one week of extensive exchange and discussion. The Scientific Organizing Committee (SOC) included John Brown (Glasgow), Joseph Cassinelli (Madison), Paul Crowther (Sheffield), Alex Fullerton (Baltimore), Wolf-Rainer Hamann (Potsdam, chair), Anthony Moffat (Montreal), Stan Owocki (Newark), and Joachim Puls (Munich). These proceedings contain the invited and contributed talks presented at the workshop, and document the extensive discussions.}, language = {en} } @article{DelgrandeLiuSchaubetal.2007, author = {Delgrande, James Patrick and Liu, Daphne H. and Schaub, Torsten and Thiele, Sven}, title = {COBA 2.0 : a consistency-based belief change system}, year = {2007}, language = {en} } @phdthesis{Goldobin2007, author = {Goldobin, Denis S.}, title = {Coherence and synchronization of noisy-driven oscillators}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15047}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {In the present dissertation paper we study problems related to synchronization phenomena in the presence of noise which unavoidably appears in real systems. One part of the work is aimed at investigation of utilizing delayed feedback to control properties of diverse chaotic dynamic and stochastic systems, with emphasis on the ones determining predisposition to synchronization. Other part deals with a constructive role of noise, i.e. its ability to synchronize identical self-sustained oscillators. First, we demonstrate that the coherence of a noisy or chaotic self-sustained oscillator can be efficiently controlled by the delayed feedback. We develop the analytical theory of this effect, considering noisy systems in the Gaussian approximation. Possible applications of the effect for the synchronization control are also discussed. Second, we consider synchrony of limit cycle systems (in other words, self-sustained oscillators) driven by identical noise. For weak noise and smooth systems we proof the purely synchronizing effect of noise. For slightly different oscillators and/or slightly nonidentical driving, synchrony becomes imperfect, and this subject is also studied. Then, with numerics we show moderate noise to be able to lead to desynchronization of some systems under certain circumstances. For neurons the last effect means "antireliability" (the "reliability" property of neurons is treated to be important from the viewpoint of information transmission functions), and we extend our investigation to neural oscillators which are not always limit cycle ones. Third, we develop a weakly nonlinear theory of the Kuramoto transition (a transition to collective synchrony) in an ensemble of globally coupled oscillators in presence of additional time-delayed coupling terms. We show that a linear delayed feedback not only controls the transition point, but effectively changes the nonlinear terms near the transition. A purely nonlinear delayed coupling does not affect the transition point, but can reduce or enhance the amplitude of collective oscillations.}, language = {en} } @article{PanznerGleberSantetal.2007, author = {Panzner, Tobias and Gleber, Gudrun and Sant, Tushar and Leitenberger, Wolfram and Pietsch, Ullrich}, title = {Coherence experiments at the white-beam beamline of BESSYI}, doi = {10.1016/j.tsf.2006.12.002}, year = {2007}, abstract = {The third-generation X-ray source BESSYII (Berlin, Germany) provides coherent X-ray radiation which can be used for static and dynamic speckle analysis. Recently we have demonstrated that one can perform experiments with coherent white radiation provided by a bending magnet (5 < E < 20 keV). In this paper we show that the diffraction figure of the initial pinhole must be considered for the interpretation of coherent experiments. The reflectivity spectrum of a sample results from the Fresnel diffraction of the incident pinhole deformed by the static speckle features of the sample surface. For dynamical experiments all speckle like features alter with time whereas the pure Fresnel fringes remain constant. (c) 2007 Published by Elsevier B.V.}, language = {en} } @article{GreffetHenkel2007, author = {Greffet, Jean-Jacques and Henkel, Carsten}, title = {Coherent thermal radiation}, issn = {0010-7514}, year = {2007}, abstract = {The radiation emitted by a heated body is generally quoted as a typical example of incoherent radiation, in distinction to laser radiation. One is nearly isotropic, the other highly directional; one is spectrally broad, the other quasi-monochromatic. It may come as a surprise that the thermal radiation of a large number of substances is coherent, both in space and time, when it is observed at a distance from the body that is shorter than the wavelength. This behaviour can be understood within an electromagnetic approach to thermal emission. Several recent experiments have confirmed these unexpected properties.}, language = {en} } @article{HoulahanCurrieCottenieetal.2007, author = {Houlahan, Jeff E. and Currie, David J. and Cottenie, Karl and Cumming, Graeme S. and Ernest, S. K. Morgan and Findlay, C. Scott and Fuhlendorf, Samuel D. and Gaedke, Ursula and Legendre, Pierre and Magnuson, John J. and McArdle, Brian H. and Muldavin, Esteban H. and Noble, David and Russell, Robert and Stevens, Richard D. and Willis, Trevor J. and Woiwod, Ian P. and Wondzell, Steve M.}, title = {Compensatory dynamics are rare in natural ecological communities}, issn = {0027-8424}, doi = {10.1073/pnas.0603798104}, year = {2007}, abstract = {In population ecology, there has been a fundamental controversy about the relative importance of competition- driven (density-dependent) population regulation vs. abiotic influences such as temperature and precipitation. The same issue arises at the community level; are population sizes driven primarily by changes in the abundances of cooccurring competitors (i.e., compensatory dynamics), or do most species have a common response to environmental factors? Competitive interactions have had a central place in ecological theory, dating back to Gleason, Volterra, Hutchison and MacArthur, and, more recently, Hubbell's influential unified neutral theory of biodiversity and biogeography. If competitive interactions are important in driving year-to-year fluctuations in abundance, then changes in the abundance of one species should generally be accompanied by compensatory changes in the abundances of others. Thus, one necessary consequence of strong compensatory forces is that, on average, species within communities will covary negatively. Here we use measures of community covariance to assess the prevalence of negative covariance in 41 natural communities comprising different taxa at a range of spatial scales. We found that species in natural communities tended to covary positively rather than negatively, the opposite of what would be expected if compensatory dynamics were important. These findings suggest that abiotic factors such as temperature and precipitation are more important than competitive interactions in driving year-to-year fluctuations in species abundance within communities.}, language = {en} } @phdthesis{Haase2007, author = {Haase, Matthias}, title = {Conceptual Capacities}, address = {Potsdam}, pages = {223 S.}, year = {2007}, language = {en} } @article{FranzkeBoogersRuanoetal.2007, author = {Franzke, Jochen and Boogers, Marcel and Ruano, Jose M. and Schaap, Linze}, title = {Conclusions : Governance and Democracy at the Local Level - Structures, Processes and Tensions}, isbn = {978-90-352-4176-3}, year = {2007}, language = {en} } @article{SchmidHohmBlomeyeretal.2007, author = {Schmid, Brigitte and Hohm, Erika and Blomeyer, Dorothea and Zimmermann, Ulrich S. and Schmidt, Martin H. and Esser, G{\"u}nter and Laucht, Manfred}, title = {Concurrent alcohol and tobacco use during early adolescence characterizes a group at risk}, issn = {0735-0414}, doi = {10.1093/alcalc/agm024}, year = {2007}, abstract = {Aims: To investigate whether concurrent alcohol and tobacco use during early adolescence characterizes a subgroup that differs from users of one substance only regarding several risk factors for later substance use problems. Methods: Participants were from a prospective longitudinal cohort study of 384 children at risk for later psychopathology, with the majority being born with obstetric complications and psychosocial adversities. Assessments of adolescent drug consumption and related intrapersonal characteristics were obtained at age 15. Results: Compared to consumers of alcohol only, 15-year-olds drinking and smoking during the same time period (past 4 weeks) had significantly higher levels of consumption and more excessive use of alcohol, started drinking at an earlier age, had higher scores on the Fagerstrom Test for Nicotine Dependence, and more cannabis use. This group could be distinguished from users of alcohol only by higher novelty seeking and more positive alcohol effect expectancies. Compared to consumers of tobacco only, concurrent users reported higher nicotine dependence and more cannabis use. No significant differences were observed regarding frequency and age at initiation of tobacco use, tobacco-related sensitivity, self- efficacy and instrumentality as well as novelty seeking. Conclusions: Concurrent alcohol and tobacco use during early adolescence is associated with characteristics that are well known as risk factors for later alcohol use problems and dependence and that should be targeted by prevention programs.}, language = {en} } @book{OPUS4-34329, title = {Conference Abstracts : ECEM 2007 ; 14. European Conference on Eye Movements ECEM2007, Potsdam, August 19 - 23, 2007}, series = {Journal of eye movement research : Special issue}, volume = {1}, journal = {Journal of eye movement research : Special issue}, editor = {Kliegl, Reinhold}, publisher = {Universit{\"a}t}, address = {Potsdam}, issn = {1995-8692}, pages = {179 S.}, year = {2007}, language = {en} } @article{GebserKaufmannNeumannetal.2007, author = {Gebser, Martin and Kaufmann, Benjamin and Neumann, Andr{\´e} and Schaub, Torsten}, title = {Conflict-driven answer set enumeration}, isbn = {978-3-540- 72199-4}, year = {2007}, language = {en} } @article{GebserKaufmannNeumannetal.2007, author = {Gebser, Martin and Kaufmann, Benjamin and Neumann, Andr{\´e} and Schaub, Torsten}, title = {Conflict-driven answer set solving}, isbn = {978-1-57735-323-2}, year = {2007}, language = {en} } @article{WackerDahmsSengeetal.2007, author = {Wacker, Philipp and Dahms, Katja and Senge, Mathias O. and Kleinpeter, Erich}, title = {Conformational Landscape of meso-(1,3-Dithian-2-yl)porphyrins}, doi = {10.1021/Jo0708700}, year = {2007}, abstract = {An investigation of the conformational landscape of 1,3-dithian-2-yl bearing porphyrins and the rotational behavior of the dithianyl substituents in meso position was carried out by variable-temperature (VT) NMR spectroscopy. Additionally, theoretical results for alternative conformations and energy barriers were obtained by molecular modeling. The study revealed different NH trans tautomers with regard to the orientation of the dithianyl ligands for the free base porphyrins 1-3. Relatively ruffled porphyrin core conformations were established for the transition states of the dithianyl rotation, resulting in a lower rotational energy barrier for the nickel(II) complex 4 compared to that of the free base systems. The data obtained and the first depiction of a rotational transition state for the rotation of bulky meso-alkyl substituents illustrate the close structural interplay between meso-alkyl substituents and the macrocycle conformation in porphyrins.}, language = {en} } @phdthesis{Gutjahr2007, author = {Gutjahr, Petra}, title = {Conformations of semiflexible polymers and filaments}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15918}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {The biological function and the technological applications of semiflexible polymers, such as DNA, actin filaments and carbon nanotubes, strongly depend on their rigidity. Semiflexible polymers are characterized by their persistence length, the definition of which is the subject of the first part of this thesis. Attractive interactions, that arise e.g.~in the adsorption, the condensation and the bundling of filaments, can change the conformation of a semiflexible polymer. The conformation depends on the relative magnitude of the material parameters and can be influenced by them in a systematic manner. In particular, the morphologies of semiflexible polymer rings, such as circular nanotubes or DNA, which are adsorbed onto substrates with three types of structures, are studied: (i) A topographical channel, (ii) a chemically modified stripe and (iii) a periodic pattern of topographical steps. The results are compared with the condensation of rings by attractive interactions. Furthermore, the bundling of two individual actin filaments, whose ends are anchored, is analyzed. This system geometry is shown to provide a systematic and quantitative method to extract the magnitude of the attraction between the filaments from experimentally observable conformations of the filaments.}, language = {en} } @article{FerySkopeteas2007, author = {F{\´e}ry, Caroline and Skopeteas, Stavros}, title = {Contrastive Topics in Pairing Answers : a Cross-Linguistic Production Study}, isbn = {3-11-019315-9}, year = {2007}, language = {en} } @article{DolchBatsaikhanThieleetal.2007, author = {Dolch, D. and Batsaikhan, Nyamsuren and Thiele, K. and Burger, F. and Scheffler, Ingo and Kiefer, A. and Mayer, Frank and Samjaa, R. and Stubbe, Annegret and Stubbe, Michael and Krall, L. and Steinhauser, D.}, title = {Contributions to the chiroptera of Mongolia with first evidences on species communities and ecological niches}, issn = {0440-1298}, year = {2007}, language = {en} } @phdthesis{Beeg2007, author = {Beeg, Janina}, title = {Cooperative behavior of motor proteins}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15712}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {The cytoskeletal motor protein kinesin-1 (conventional kinesin) is the fast carrier for intracellular cargo transport along microtubules. So far most studies aimed at investigating the transport properties of individual motor molecules. However, the transport in cells usually involves the collective work of more than one motor. In the present work, we have studied the movement of beads as artificial loads/organelles pulled by several kinesin-1 motors in vitro. For a wide range of motor coverage of the beads and different bead (cargo) sizes the transport parameters walking distance or run length, velocity and force generation are measured. The results indicate that the transport parameters are influenced by the number of motors carrying the bead. While the transport velocity slightly decreases, an increase in the run length was measured and higher forces are determined, when more motors are involved. The effective number of motors pulling a bead is estimated by measuring the change in the hydrodynamic diameter of kinesin-coated beads using dynamic light scattering. The geometrical constraints imposed by the transport system have been taken into account. Thus, results for beads of different size and motor-surface coverage could be compared. In addition, run length-distributions obtained for the smallest bead size were matched to theoretically calculated distributions. The latter yielded an average number of pulling motors, which is in agreement with the effective motor numbers determined experimentally.}, language = {en} } @book{OPUS4-11365, title = {Cultural Aspects of Public Management Reform}, series = {Research in Public Policy Analysis and Management}, volume = {16}, journal = {Research in Public Policy Analysis and Management}, editor = {Schedler, Kuno and Proeller, Isabella}, edition = {1. publ}, publisher = {Elsevier JAI}, address = {Amsterdam}, isbn = {978-0-7623-1400-3}, pages = {367 S.}, year = {2007}, abstract = {n an international context, public management arrangements differ significantly from country to country, but also regionally and locally. One reason for these differences may be differences in culture resulting in differing views of the state and its institutions. This may sound trivial, but it becomes highly important when public management reform models are proposed and transferred from one country to others such as was (and still is) the case with, for example, the new public management. Scholars in public management as well as internationally acting practitioners should be aware of the impact culture has on the possibilities and limits of concept transfers between different jurisdictions. Having said this, one precondition for a better consideration of cultural elements in public management reforms is a better understanding of culture itself. Among the public management community, cultural theory has gained considerable attention. There are, however, other concepts for the analysis of cultural facts that may be of interest to the subject, too. In the book, cultural (including organizational culture of public organizations) influences on public management and its reform are explored. Articles address definitions and conceptualizations of culture in the context of public management, cultural artifacts in public management and gives examples of cultural elements in public management from various countries. The volume helps to structure the discussion of cultural elements and points out approaches to study and incorporate cultural aspects in public management research and debate.}, language = {en} } @phdthesis{GholamiGhadikolaei2007, author = {Gholami Ghadikolaei, Iraj}, title = {Data analysis of continuous gravitational waves}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-18800}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {This thesis describes two main projects; the first one is the optimization of a hierarchical search strategy to search for unknown pulsars. This project is divided into two parts; the first part (and the main part) is the semi-coherent hierarchical optimization strategy. The second part is a coherent hierarchical optimization strategy which can be used in a project like Einstein@Home. In both strategies we have found that the 3-stages search is the optimum strategy to search for unknown pulsars. For the second project we have developed a computer software for a coherent Multi-IFO (Interferometer Observatory) search. To validate our software, we have worked on simulated data as well as hardware injected signals of pulsars in the fourth LIGO science run (S4). While with the current sensitivity of our detectors we do not expect to detect any true Gravitational Wave signals in our data, we can still set upper limits on the strength of the gravitational waves signals. These upper limits, in fact, tell us how weak a signal strength we would detect. We have also used our software to set upper limits on the signal strength of known isolated pulsars using LIGO fifth science run (S5) data.}, language = {en} } @article{BrainGebserPuehreretal.2007, author = {Brain, Martin and Gebser, Martin and P{\"u}hrer, J{\"o}rg and Schaub, Torsten and Tompits, Hans and Woltran, Stefan}, title = {Debugging ASP programs by means of ASP}, isbn = {978-3-540- 72199-4}, year = {2007}, language = {en} } @phdthesis{Frank2007, author = {Frank, Jonas}, title = {Decentralization in Ecuador : actors, institutions, and incentives}, publisher = {Nomos}, address = {Baden-Baden}, isbn = {978-3-8329-2708-0}, pages = {327 S. : graph. Darst.}, year = {2007}, language = {en} } @article{Stockhorst2007, author = {Stockhorst, Stefanie}, title = {Defining conventions for the verse epic in German : notes on the Relationship between codified poetics and poetological paratexts in the baroque poetry reform}, year = {2007}, language = {en} } @phdthesis{Kulkarni2007, author = {Kulkarni, Amit Narahari}, title = {Degradation kinetics studies of polymers for biomedical applications}, address = {Potsdam}, pages = {vi, 144, viii S. : graph. Darst.}, year = {2007}, language = {en} } @misc{Meyer2007, type = {Master Thesis}, author = {Meyer, Eike}, title = {Democracy promotion by the European Union in Morocco within the framework of the European Neighbourhood Policy}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-19591}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {The intention of this master-thesis is a critical assessment of the European Union´s (EU) approach to external democracy promotion in Morocco. The study follows a comparative approach and compares the approach pursued by the EU within the framework of the European Neighbourhood Policy (ENP), incepted in 2004, with the approach that it had developed up until then under the framework of the Euro-Mediterranean Partnership (EMP). The comparison is done with the intention to analyse, to what degree it is justified to speak of a new impetus for democratisation through the ENP in partner countries. The analysis takes into consideration the range of possible instruments for external democracy promotion in the categories „diplomacy", „conditionality" and „positive instruments". For the comparison of democracy promotion under the EMP and the ENP it is suggested to compare the implemented measures in respect to three distinct dimensions: As a first dimension, instruments of democracy promotion are analysed with respect to the focus on indirect vs. direct instruments, e.g. those which aim at establishing socio-economic preconditions favourable to successful democratisation, vs. those which immediately intervene in the processes of political reform. As a second dimension, it is asked whether there has been a shift in the democracy promotion approach on a continuum between consensual cooptation and coercive intervention. As a third dimension, finally, it is analysed whether the approach has undergone a general intensification of efforts, e.g. whether the approach to democracy promotion has become a more active one. The analysis in this master-thesis comes to the conclusion that since the inception of the ENP the EU is indeed pursuing a slightly more direct and certainly a more active approach to democracy promotion in Morocco, while no significant change can be observed in comparison to the strictly partnership-oriented and consensual approach of the EMP. It can be argued that, under the ENP, relations to Morocco have indeed become somewhat more "political", although at the same time they are still not pro-actively oriented at a political liberalisation of the political regime. Reforms promoted by the EU in Morocco are modest and largely in line with the reform agenda of the Morrocan government itself - e.g. a still largely authoritarian monarchy. Concrete reform steps directed at an opening of the political space, which is largely reserved to the king and its administration, are neither demanded nor supported by democracy promotion instruments, also under the ENP.}, language = {en} } @misc{Paun2007, type = {Master Thesis}, author = {Paun, Christopher}, title = {Democratization and police reform}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-19487}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {This paper compares police reforms during democratization in Poland, Hungary, and Bosnia-Herzegovina. It analyses the changes to the structure of the democratic control of the police in each reform, paying special attention to the decentralization versus centralization aspect of it. The research question of this paper is: Why are some states decentralizing the democratic control of the police, while others are centralizing it, both with the aim of democratization? The theoretical background of this study are theories about policy diffusion and policy transfer. Therefore this study can be categorized as part of two different research areas. On the one hand, it is a paper from the discipline of International Relations. On the other hand, it is a paper from the discipline of Comparative Politics. The combined attention to international and national factors influencing police reform is reflected by the structure of this paper. Chapter 3 examines police structures and police reforms in established democracies as possible role models for new democracies. Chapter 4 looks at international and transnational actors that actively try to influence police reform. After having examined these external factors, three cases of police reform in new democracies are examined in chapter 5.}, language = {en} } @article{SchneidenbachSchnor2007, author = {Schneidenbach, Lars and Schnor, Bettina}, title = {Design Issues in the Implementation of MPI2 One Sided Communication in Ethernet based Networks}, isbn = {978-0-88986-637-9}, year = {2007}, abstract = {In current research, one sided communication of the MPI2 standard is pushed as a promising technique [6, 7, 10, 18]. But measurements of applications and MPI2 primitives show a different picture [17]. In this paper we analyze de sign issues of MPI2 one sided communication and its im plementations. We focus on asynchronous communication for parallel applications in Ethernet cluster environments. Further, one sided communication is compared to two sided communication. This paper will prove that the key problem to performance is not only the implementation of MPI2 one sided communication - it is the design.}, language = {en} } @article{BellParkPearceetal.2007, author = {Bell, Elanor M. and Park, Tae-Gyu and Pearce, Imojen and Rublee, Parke A. and Bolch, Christopher J. S. and Hallegraeff, Gustaff M.}, title = {Detection of a novel ecotype of Pfiesteria piscicida (Dinophyceae) in an Antarctic saline lake by real-time PCR}, year = {2007}, language = {en} } @phdthesis{Rust2007, author = {Rust, Henning}, title = {Detection of long-range dependence : applications in climatology and hydrology}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-13347}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {It is desirable to reduce the potential threats that result from the variability of nature, such as droughts or heat waves that lead to food shortage, or the other extreme, floods that lead to severe damage. To prevent such catastrophic events, it is necessary to understand, and to be capable of characterising, nature's variability. Typically one aims to describe the underlying dynamics of geophysical records with differential equations. There are, however, situations where this does not support the objectives, or is not feasible, e.g., when little is known about the system, or it is too complex for the model parameters to be identified. In such situations it is beneficial to regard certain influences as random, and describe them with stochastic processes. In this thesis I focus on such a description with linear stochastic processes of the FARIMA type and concentrate on the detection of long-range dependence. Long-range dependent processes show an algebraic (i.e. slow) decay of the autocorrelation function. Detection of the latter is important with respect to, e.g. trend tests and uncertainty analysis. Aiming to provide a reliable and powerful strategy for the detection of long-range dependence, I suggest a way of addressing the problem which is somewhat different from standard approaches. Commonly used methods are based either on investigating the asymptotic behaviour (e.g., log-periodogram regression), or on finding a suitable potentially long-range dependent model (e.g., FARIMA[p,d,q]) and test the fractional difference parameter d for compatibility with zero. Here, I suggest to rephrase the problem as a model selection task, i.e.comparing the most suitable long-range dependent and the most suitable short-range dependent model. Approaching the task this way requires a) a suitable class of long-range and short-range dependent models along with suitable means for parameter estimation and b) a reliable model selection strategy, capable of discriminating also non-nested models. With the flexible FARIMA model class together with the Whittle estimator the first requirement is fulfilled. Standard model selection strategies, e.g., the likelihood-ratio test, is for a comparison of non-nested models frequently not powerful enough. Thus, I suggest to extend this strategy with a simulation based model selection approach suitable for such a direct comparison. The approach follows the procedure of a statistical test, with the likelihood-ratio as the test statistic. Its distribution is obtained via simulations using the two models under consideration. For two simple models and different parameter values, I investigate the reliability of p-value and power estimates obtained from the simulated distributions. The result turned out to be dependent on the model parameters. However, in many cases the estimates allow an adequate model selection to be established. An important feature of this approach is that it immediately reveals the ability or inability to discriminate between the two models under consideration. Two applications, a trend detection problem in temperature records and an uncertainty analysis for flood return level estimation, accentuate the importance of having reliable methods at hand for the detection of long-range dependence. In the case of trend detection, falsely concluding long-range dependence implies an underestimation of a trend and possibly leads to a delay of measures needed to take in order to counteract the trend. Ignoring long-range dependence, although present, leads to an underestimation of confidence intervals and thus to an unjustified belief in safety, as it is the case for the return level uncertainty analysis. A reliable detection of long-range dependence is thus highly relevant in practical applications. Examples related to extreme value analysis are not limited to hydrological applications. The increased uncertainty of return level estimates is a potentially problem for all records from autocorrelated processes, an interesting examples in this respect is the assessment of the maximum strength of wind gusts, which is important for designing wind turbines. The detection of long-range dependence is also a relevant problem in the exploration of financial market volatility. With rephrasing the detection problem as a model selection task and suggesting refined methods for model comparison, this thesis contributes to the discussion on and development of methods for the detection of long-range dependence.}, language = {en} } @phdthesis{AhmadAbadi2007, author = {Ahmad Abadi, Mohammad}, title = {Development and application of novel genetic transformation technologies in maize (Zea mays L.)}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-14572}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Plant genetic engineering approaches are of pivotal importance to both basic and applied research. However, rapid commercialization of genetically engineered crops, especially maize, raises several ecological and environmental concerns largely related to transgene flow via pollination. In most crops, the plastid genome is inherited uniparentally in a maternal manner. Consequently, a trait introduced into the plastid genome would not be transferred to the sexually compatible relatives of the crops via pollination. Thus, beside its several other advantages, plastid transformation provides transgene containment, and therefore, is an environmentally friendly approach for genetic engineering of crop plants. Reliable in vitro regeneration systems allowing repeated rounds of regeneration are of utmost importance to development of plastid transformation technologies in higher plants. While being the world's major food crops, cereals are among the most difficult-to-handle plants in tissue culture which severely limits genetic engineering approaches. In maize, immature zygotic embryos provide the predominantly used material for establishing regeneration-competent cell or callus cultures for genetic transformation experiments. The procedures involved are demanding, laborious and time consuming and depend on greenhouse facilities. In one part of this work, a novel tissue culture and plant regeneration system was developed that uses maize leaf tissue and thus is independent of zygotic embryos and greenhouse facilities. Also, protocols were established for (i) the efficient induction of regeneration-competent callus from maize leaves in the dark, (ii) inducing highly regenerable callus in the light, and (iii) the use of leaf-derived callus for the generation of stably transformed maize plants. Furthermore, several selection methods were tested for developing a plastid transformation system in maize. However, stable plastid transformed maize plants could not be yet recovered. Possible explanations as well as suggestions for future attempts towards developing plastid transformation in maize are discussed. Nevertheless, these results represent a first essential step towards developing chloroplast transformation technology for maize, a method that requires multiple rounds of plant regeneration and selection to obtain genetically stable transgenic plants. In order to apply the newly developed transformation system towards metabolic engineering of carotenoid biosynthesis, the daffodil phytoene synthase (PSY) gene was integrated into the maize genome. The results illustrate that expression of a recombinant PSY significantly increases carotenoid levels in leaves. The beta-carotene (pro-vitamin A) amounts in leaves of transgenic plants were increased by ~21\% in comparison to the wild-type. These results represent evidence for maize to have significant potential to accumulate higher amounts of carotenoids, especially beta-carotene, through transgenic expression of phytoene synthases. Finally, progresses were made towards developing transformation technologies in Peperomia (Piperaceae) by establishing an efficient leaf-based regeneration system. Also, factors determining plastid size and number in Peperomia, whose species display great interspecific variation in chloroplast size and number per cell, were investigated. The results suggest that organelle size and number are regulated in a tissue-specific manner rather than in dependency on the plastid type. Investigating plastid morphology in Peperomia species with giant chloroplasts, plasmatic connections between chloroplasts (stromules) were observed under the light microscope and in the absence of tissue fixation or GFP overexpression demonstrating the relevance of these structures in vivo. Furthermore, bacteria-like microorganisms were discovered within Peperomia cells, suggesting that this genus provides an interesting model not only for studying plastid biology but also for investigating plant-microbe interactions.}, language = {en} } @article{HalamekWollenbergerStoeckleinetal.2007, author = {Hal{\´a}mek, Jan and Wollenberger, Ursula and St{\"o}cklein, Walter F. M. and Scheller, Frieder W.}, title = {Development of a biosensor for glycated hemoglobin}, issn = {0013-4686}, doi = {10.1016/j.electacta.2007.03.059}, year = {2007}, abstract = {The development of an electrochemical piezoelectric sensor for the detection of glycated hemoglobin is presented. The total hemoglobin (Hb) content is monitored with a mass-sensitive quartz crystal modified with surfactants, and the glycated fraction of the immobilized Hb is determined by subsequent voltarnmetric measurement of the coupled ferroceneboronic acid. Different modifications of the sensor were tested for their hemoglobin binding ability. Deoxycholate (DOCA) was found to be the most suitable among the examined modifiers. Piezoelectric quartz crystals with gold electrodes were modified with DOCA by covalent binding to a pre-formatted 4-aminothiophenol monolayer. The properties of the Hb binding to DOCA and the pH effect on this interaction were studied. In the proposed assay for glycated hemoglobin at first an Hb sample is incubated with ferroceneboronic acid (FcBA), which binds to the fructosyl residue of the glycated Hb. Then this preincubated Hb sample is allowed to interact with the DOCA-modified piezoelectric quartz crystal. The binding is monitored by quartz crystal nanobalance QCN). The amount of FcBA present on the sensor surface is determined by square wave voltammetry. The binding of FcBA results in well-defined peaks with an EO' of +200 mV versus Ag/AgC1 (1 M KC1). The peak height depends on the degree of glycated Hb in the sample ranging from 0\% to 20\% of total Hb. The regeneration of the sensing surface is achieved by pepsin digestion of the deposited Hb. Thus the sensor can be re-used more than 30 times.}, language = {en} } @misc{Koechert2007, type = {Master Thesis}, author = {K{\"o}chert, Karl}, title = {Development of a method to assess EAAT1 transcription levels in Alzheimer's disease}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15965}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Zur Zeit leiden ca. 24 Millionen Menschen auf der ganzen Welt unter Demenz, Alzheimer macht dabei 50-60\% aller Demenzf{\"a}lle aus. Da der Anteil der Bev{\"o}lkerung, der an Demenz leidet, proportional zum Alter zunimmt und der Anteil {\"a}lterer Menschen in der Gesellschaft von Jahr zu Jahr steigt, wird Alzheimer immer mehr zu einem ernstzunehmenden, gesellschaftlichen Problem. Zum Stand der heutigen Forschung ist es etabliert, dass die Aminos{\"a}ure Glutamat - quantitativ einer der wichtigsten Neurotransmitter im Zentralen Nervensystem (ZNS) - toxische Konzentrationen erreichen kann wenn sie - im Zuge der {\"U}bertragung von Aktionspotentialen - nach ihrer Freisetzung nicht aus dem Synaptischen Spalt entfernt wird. Viele Studien haben gezeigt, dass in der Alzheimerschen Krankheit die Glutamataufnahme beeintr{\"a}chtigt ist, was zu toxischen Konzentrationen von Glutamat und dem daraus folgenden Absterben von Neuronen f{\"u}hrt. Der exitatorische Aminos{\"a}uretransporter 1 (EAAT1) geh{\"o}rt zu der Familie der Na+-abh{\"a}ngigen Glutamattransporter und stellt nach EAAT2 den quantitativ wichtigsten Glutamattransporter im ZNS dar. In diesem Projekt wurde eine bis dahin f{\"u}r den Menschen nicht bekannte EAAT1 Spleißvariante, in der Exon 3 ausgeschnitten wird, nachgewiesen. Diese Variante wurde EAAT1Δ3 genannt und stellt damit mit EAAT1Δ9 die zweite f{\"u}r EAAT1 nachgewiesene Spleißvariante dar. Eine auf real-time RT-PCR basierende Methode wurde entwickelt, um die Transkripte von EAAT1 wildtyp (EAAT1 wt), EAAT1Δ3 und EAAT1Δ9 zu quantifizieren. Proben aus verschiedenen Hirnarealen wurden aus einem Set von Kontrollen und Alzheimerf{\"a}llen bei der Quantifizierung verwendet. Die gew{\"a}hlten Areale sind von der Alzheimerschen Krankheit unterschiedlich stark betroffen. Dies diente als interne Kontrolle f{\"u}r die durchgef{\"u}hrten Experimente und erm{\"o}glichte so die Differenzierung zwischen beobachteten Effekten: Nur Effekte die alleinig in von Alzheimer betroffenen Gehirnarealen auftreten, k{\"o}nnen als spezifisch f{\"u}r die Krankheit angesehen werden. Die Resultate diese Projektes zeigen, dass EAAT1Δ3 in sehr geringer Anzahl transkribiert wird, die nur 0.15\% der EAAT1 wt Transkription entspricht. Dahingegen entspricht das EAAT1 Δ9 Transkript im Durchschnitt 26.6\% des EAAT1 wt Transkripts. Es wurde nachgewiesen, dass die Transkriptionsrate aller EAAT1 Varianten in Alzheimerf{\"a}llen signifikant reduziert ist (P<0.0001). Dies unterst{\"u}tzt die Theorie, dass bei Alzheimerf{\"a}llen die EAAT1 Proteinexpression stark reduziert und der Glutamattransport, der normalerweise durch diesen Transporter gew{\"a}hrleistet wird, stark eingeschr{\"a}nkt ist. Dies wiederum resultiert in toxisch hohen Glutamatkonzentrationen und damit dem Absterben von Neuronen. Die gefundene Reduktion der EAAT1Transkription ist nicht spezifisch f{\"u}r Gehirnareale die von Alzheimer betroffen sind, sondern tritt in selbem Maße in nicht von Alzheimer betroffenen Gehirnarealen auf. Daraus l{\"a}sst sich schließen, dass die Reduktion der EAAT1 Transkription eher ein Resultat eines in der Alzheimerschen Krankheit pr{\"a}senten, grundlegenden Krankheitsmechanismus ist als deren Ursache.}, language = {en} } @phdthesis{Rajkumar2007, author = {Rajkumar, Rajagopal}, title = {Development of a thermometric sensor for fructosyl valine and fructose using molecularly imprinted polymers as a recognition element}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17272}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {Nature has always served as a model for mimicking and inspiration to humans in their efforts to improve their life. Researchers have been inspired by nature to produce biomimetic materials with molecular recognition properties by design rather than evolution. Molecular imprinting is one way to prepare such materials. Such smart materials with new functionalities are at the forefront of the development of a relevant number of ongoing and perspective applications ranging from consumer to space industry. Molecularly imprinted polymers were developed by mimicking the natural enzymes or antibodies that serve as host for binding target molecules. These imprints were used as a recognition element to substitute natural biomolecules in biosensors. The concept behind molecular imprinting is to mold a material (with the desired chemical properties) around individual molecules. Upon removal of the molecular templates, one is left with regions in the molded material that fit the shape of the template molecules. Thus, molecular imprinting results in materials that can selectively bind to molecules of interest. Imprinted materials resulted in applications ranging from chemical separation to bioanalytics. In this work attempts were made particularly in the development of molecularly imprinted polymer based thermometric sensors. The main effort was focused towards the development of an covalently imprinted polymer that would be able to selectively bind fructosyl valine (Fru-Val), the N-terminal constituent of hemoglobin A1c ß-chains. Taking into account the known advantages of imprinted polymers, e.g. robustness, thermal and chemical stability, imprinted materials were successfully used as a recognition element in the sensor. One of the serious problems associated with the development of MIP sensors and which lies in the absence of a generic procedure for the transformation of the polymer-template binding event into a detectable signal has been addressed by developing the "thermometric" approach. In general the developed approach gives a new insight on MIP/Analyte interactions.}, language = {en} } @phdthesis{Henderson2007, author = {Henderson, Gemma}, title = {Development of bacterial food preparations with tumour-prophylactic potential}, address = {Potsdam}, pages = {IV, 90 Bl. : graph. Darst.}, year = {2007}, language = {en} } @article{NeuvonenNeuvonenKochetal.2007, author = {Neuvonen, Helmi and Neuvonen, Kari and Koch, Andreas and Kleinpeter, Erich}, title = {DFT study of the substituent cross-interaction effects on the conformation of substituted N-benzylideneanilines : Models of liquid crystal forming compounds ; use of C-13 Nmr chemcal shift of the C=N carbon as a tool to predict the conformation of the molecule}, doi = {10.1016/j.theochem.2007.03.023}, year = {2007}, abstract = {The conformations of N-benzylideneani lines p-X-C6H4-CH=N-C6H4 p-Y (X, Y = NO2, CN, CF3, F, Cl, Br, H, Me, OMe, NMe2) have been studied by B3LYP density functional (DFT) hybrid method in combination with the 6-31G* or 6-311G* split valence basis set. The twist of the plane of the aniline ring with respect to the other part of the molecule (tau(2)) is systematically controlled by substituents X and Y, the effect of Y being larger. The value of the dihedral angle tau(2), correlates nicely with equation tau(2) = rho(F)(Y)(x)sigma(F)(Y)+rho(+R)(Y)(x)sigma(+)(R)(Y) + k(x) or tau(2) = rho(F)(X)(y)sigma(F)(X)+rho(-)(R)(X)(y)sigma(+)(R)(X) + k(y), respectively, when aniline or benzylidene substituent is varied. ED substituents X diminish the sensitivity of tau(2) to the aniline substituent Y[rho(F)(Y)(x) and rho(+)(R)(Y)(x)] while ED substituents Y increase the sensitivity Of T2 to the benzylidene substituent X[rho(F)(X)(y) and rho(+)(R)(X)(y)]. There seems to be two competitive conjugative interactions for the aniline ring n electrons: one with the nitrogen lone pair and one with the C=N unit. Substituents X and Y adjust the extent of these interactions and therefore the conformation of the molecule. A good correlation is observed between the dihedral angle tau(2) and the experimental C-13 NMR chemical shift of the C=N carbon of N-benzylideneanilines in CDCl3 (C) 2007 Elsevier B.V. All rights reserved.}, language = {en} } @article{QiuMellingerWirgesetal.2007, author = {Qiu, Xunlin and Mellinger, Axel and Wirges, Werner and Gerhard, Reimund}, title = {Dielectric barrier discharges during the generation of ferroelectrets : optical spectroscopy for process monitoring}, isbn = {978-1-4244-1482-6}, year = {2007}, language = {en} } @book{Weithoff2007, author = {Weithoff, Guntram}, title = {Dietary restriction in two rotifers species : the effect of the length of food deprivation on life span and reproduction}, doi = {10.1007/s00442-007-0739-6}, year = {2007}, abstract = {According to resource allocation theory, animals face a trade off between the allocation of resources into reproduction and into individual growth/maintenance. This trade off is reinforced when food conditions decline. It is well established in biological research that many animals increase their life span when food is in suboptimal supply for growth and/or reproduction. Such a situation of reduced food availability is called dietary restriction. An increase in life span under dietary restricted conditions is seen as a strategy to tolerate periods of food shortage so that the animals can start reproduction again when food is in greater supply. In this study, the effect of dietary restriction on life span and reproduction in two rotifer species, Cephalodella sp. and Elosa worallii, was investigated using life table experiments. The food concentration under dietary restricted conditions was below the threshold for population growth. It was (1) tested whether the rotifers start reproduction again after food replenishment, and (2) estimated whether the time scale of dietary restricted conditions is relevant for the persistence of a population in the field. Only E. worallii responded to dietary restriction with an increase in life span at the expense of reproduction. After replenishment of food, E. worallii started to reproduce again within I day. With an increase in the duration of dietary restricted conditions of up to 15 days, which is longer than the median life span of E. worallii under food saturation, the life span increased and the life time reproduction decreased. These results suggest that in a temporally (or spatially) variable environment, some rotifer populations can persist even during long periods of severe food deprivation.}, language = {en} } @phdthesis{Kellner2007, author = {Kellner, Antje}, title = {Different styles of deformation of the fore-arc wedge along the Chilean convergent margin : insights from 3D numerical experiments}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15898}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {The styles of deformation of the fore-arc wedges along the Chilean convergent margin are observed to vary significantly, despite similar plate kinematic conditions. Here, I focus on the analysis of fore-arc deformation on two regions along the Chilean convergent margin at 20°-24°S and 37°-42°S. Although both regions are subjected to the oblique subduction of the oceanic Nazca plate and backstopped by the Andes mountain chain; they display different patterns of deformation. The northern Chilean study area (20° - 24°S) is characterized by an exceptionally thick crust of about 60 km beneath the Altiplano - Puna plateau, lack of an accretionary wedge in the fore-arc due to hyperarid climate, and consequently a sediment starved trench. Two major margin parallel strike slip faults are observed in this area, the Atacama Fault Zone (AFZ) and the Precordilleran Fault System (PFS). Both strike-slip faults do not exhibit significant recent displacement. The southern study area (37° - 42°S), compared to the northern study area, is characterized by lower topography, high precipitation rates (~2000 mm/yr), and a younger subducted oceanic plate. An active strike-slip fault, the Liqui{\~n}e-Ofqui-Fault-Zone (LOFZ), shows ~1 cm/yr recent dextral movement and shapes the surface of this area. Thus, the southern Chilean study area exhibits localized strike-slip motion. Within this area the largest earthquake ever recorded, the 1960 Valdivia earthquake, occurred with a moment magnitude of MW=9.5. I have constructed 2D thermal models and 3D mechanical models for both Chilean study areas to study processes related to active subduction. The applied numerical method is the finite element technique by means of the commercial software package ABAQUS. The thermal models are focused on the thermal conditions along the plate interface. The thermal structure along the plate interface reveals the limits of coupling but also the type of transition from coupled to uncoupled and vice versa. The model results show that shear heating at the plate interface is an important mechanism that should be taken into account. The models also show that the thermal condition at the downdip limit of the coupling zone leads to a sharp decrease of friction along the interface. Due to the different geometries of the two Chilean study areas, such as the slab dip and the thickness of the continental crust, the downdip limit of the southern study area is slightly shallower than that of the northern study area. The results of the 2D thermal models are used to constrain the spatial extent of the coupling zone in the 3D mechanical models. 3D numerical simulations are used to investigate how geometry, rheology and mechanical parameters influence strain partitioning and styles of deformation in the Chilean fore-arc. The general outline of the models is based on the fore-arc geometry and boundary conditions as derived from geophysical and geological field data. I examined the influence of different rheological approaches and varying physical properties of the fore-arc to identify and constrain the parameters controlling the difference in surface deformation between the northern and southern study area. The results of numerical studies demonstrate that a small slab dip, a high coefficient of basal friction, a high obliquity of convergence, and a high Young's modulus favour localisation of deformation in the fore-arc wedge. This parameter study helped me to constrain preferred models for the two Chilean study areas that fit to first order observations. These preferred models explain the difference in styles of deformation as controlled by the angle of obliquity, the dip of subducting slab, and the strength of wedge material. The difference in styles can be even larger if I apply stronger coupling between plates within the southern area; however, several independent observations indicate opposite tendency showing southward decrease of intensity of coupling. The weaker wedge material of the preferred model for the northern study area is associated with advanced development of the adjacent orogen, the Central Andes. Analysis of world-wide examples of oblique subduction zones supports the conclusion that more mature subduction zones demonstrate less pronounced localization of strike-slip motion.}, language = {en} } @article{ParkinsonAharonChangetal.2007, author = {Parkinson, P. and Aharon, E. and Chang, M. H. and Dosche, Carsten and Frey, G. L. and K{\"o}hler, Anna and Herz, L. M.}, title = {Dimensionality-dependent energy transfer in polymer-intercalated SnS2 nanocomposites}, doi = {10.1103/Physrevb.75.165206}, year = {2007}, abstract = {We have investigated the influence of dimensionality on the excitation-transfer dynamics in a conjugated polymer blend. Using time-resolved photoluminescence spectroscopy, we have measured the transfer transients for both a three-dimensional blend film and for quasi-two-dimensional monolayers formed through intercalation of the polymer blend between the crystal planes of an inorganic SnS2 matrix. We compare the experimental data with a simple, dimensionality- dependent model based on electronic coupling between electronic transition moments taken to be point dipoles. Within this approximation, the energy-transfer dynamics is found to adopt a three-dimensional character in the solid film and a two-dimensional nature in the monolayers present in the SnS2-polymer nanocomposite.}, language = {en} } @article{EndrissHinterwimmer2007, author = {Endriss, Cornelia and Hinterwimmer, Stefan}, title = {Direct and indirect abountness topics}, isbn = {978-3-939469-88-9}, year = {2007}, language = {en} } @article{EndrissHinterwimmer2007, author = {Endriss, Cornelia and Hinterwimmer, Stefan}, title = {Direct and indirect aboutness topics}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-19640}, year = {2007}, abstract = {We propose a definition of aboutness topicality that not only encompasses individual denoting DPs, but also indefinites. We concentrate on the interpretative effects of marking indefinites as topics: they either receive widest scope in their clause, or they are interpreted in the restrictor of an overt or covert Q-adverb. We show that in the first case they are direct aboutness topics insofar as they are the subject of a predication expressed by the comment, while in the second case they are indirect aboutness topics: they define the subject of a higher-order predication - namely the set of situations that the respective Q-adverb quantifies over.}, language = {en} } @article{KampeKoenigRinkePetzoldtetal.2007, author = {Kampe, Heike and K{\"o}nig-Rinke, Marie and Petzoldt, Thomas and Benndorf, J{\"u}rgen}, title = {Direct effects of Daphnia-grazing, not infochemicals, mediate a shift towards large inedible colonies of the gelatinous green alga Sphaerocystis schroeteri}, issn = {0075-9511}, doi = {10.1016/j.limno.2007.01.001}, year = {2007}, abstract = {The influence of Daphnia galeata x hyalina grazing and of infochemicals released by the daphnids on the colony size and growth rate of the colonial gelatinous green alga Sphaerocystis schroeteri (Chlorococcales) was investigated in laboratory batch experiments run for 96 h. High zooplankton grazing pressure was exerted by a final concentration of 100 daphnids L-1 in the Daphnia treatments. Infochemicals were obtained by filtration (0.2 µm) of water from D. galeata x hyalina cultures (200 ind. L-1 exposed for 24 h). This filtrate was added to the S. schroeteri cultures in two concentrations corresponding to 7 and 50 daphnids L-1, respectively. The growth rate of S. schroeteri was neither affected significantly by direct Daphnia grazing nor by the presence of Daphnia infochemicals in comparison to the control. However, the portion of inedible S. schroeteri colonies (diameter > 50 µm) increased under direct grazing pressure, whereas the Daphnia infochemicals did not influence the colony size significantly. We conclude that the shift in colony size by direct zooplankton grazing denotes an effective defence mechanism against size selective feeding for colonial gelatinous green algae. This effective defence in combination with unchanged growth rates of the larger colonies (under non-limiting nutrient and light conditions) falsifies the assumption of a trade-off between minimising grazing losses and maximising growth by optimising the colony size.}, language = {en} } @article{SchefflerKetelhutMohasseb2007, author = {Scheffler, Christiane and Ketelhut, Kerstin and Mohasseb, Iman}, title = {Does physical education modify the body composition? - Results of a longitudinal study of pre-school children}, year = {2007}, abstract = {The aim of the study is the analysis of body composition, motor development and cardiovascular parameters of preschool-children. In 2001/2002 a longitudinal study started in 17 nursery schools in Berlin. A total of 160 children out of the 264 children participated in a regular exercise programme. After 24 months of training significant differences of body composition, motor skills and cardiovascular parameters between 5 complete year old children of the intervention and the control group were observed. The results show that such an exercise programme is successful as a preventive measure to decrease the risk of obesity.}, language = {en} } @article{ModarresiAlamKhamooshiRostamizadehetal.2007, author = {Modarresi-Alam, Ali Reza and Khamooshi, Ferydoon and Rostamizadeh, Mohsen and Keykha, Hossein and Nasrollahzahdeh, Mahmoud and Bijanzadeh, Hamid-Reza and Kleinpeter, Erich}, title = {Dynamic 1H NMR spectroscopic study of the restricted S-N rotation in aryl-N-(arylsulfonyl)-N- (triphenylphosphoranylidene)imidocarbamates}, year = {2007}, abstract = {Dynamic 1H NMR (500 MHz) investigation of aryl-N-(arylsulfonyl)-N-(triphenylphosphoranylidene)imidocarbamates in CDCl3, CD3COCD3, and CD3OD at the temperature range of 183-298 K is reported. The observed free energy barriers (almost 12 kcal mol;1) are attributed to conformational isomerization about the N{\`u}S bond and these barriers show very little solvent dependence.}, language = {en} } @article{ModarresiNajafiRostamizadehetal.2007, author = {Modarresi, Ali Reza and Najafi, Parisa and Rostamizadeh, Mohsen and Keykha, Hossein and Bijanzadeh, Hamid-Reza and Kleinpeter, Erich}, title = {Dynamic 1H NMR study of the barrier to rotation about the C-N bond in primary carbamates and its solvent dependence}, year = {2007}, abstract = {The dynamic 1H NMR study of some primary carbamates in the solvents CDCl3 and CD3COCD3 between 183 and 298 K is reported. The free energies of activation, thus obtained (12.4 to 14.3 kcal mol-1), were attributed to the conformational isomerization about the N-C bond. These barriers to rotation show solvent dependence in contrast to the tertiary analogues and are lower in free energy by ca. 2-3 kcal mol-1.}, language = {en} }