TY  - BOOK
A1  - Abel, Markus
A1  - Holschneider, Matthias
T1  - Modellierung und Datenbankanalyse komplexer Systeme Teil 10 : Vorlesung 2009-07-09
N2  - Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.
Y1  - 2009
UR  - http://info.ub.uni-potsdam.de/multimedia/show_projekt.php?projekt_id=45
PB  - Univ.-Bibl.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Ale-Agha, Nosratollah
A1  - Boyle, H.
A1  - Braun, Uwe
A1  - Butin, H.
A1  - Jage, Horst
A1  - Kummer, Volker
A1  - Shin, H.
T1  - Taxonomy, host range and distribution of some powdery mildew fungi (Erysiphales)
N2  - Oidium pedaliacearum sp. nov. (; O. sesami, nom. inval.) and Podosphaera macrospora comb. et stat. nov. (; Sphaerotheca alpina f. macrospora) are introduced, and the taxonomy and distribution of Erysiphe celosiae is discussed. New host species and new collections of Erysiphe cruciferarum (on Cleome hassleriana), E. flexuosa (on Aesculus hippocastanum), E. hedwigii (on Viburnum carlesii), E. heraclei (on Tinguarra montana), E. cf. macleayae (on Macleaya cordata), E. prunastri (on Prunus cerasifera), E. sedi (on Sedum aff. spectabilis), E. trifolii (on Trigonella caerulea), Golovinomyces cichoracearum (on Argyranthemum pinnatifidum subsp. succulentum), G. cf. hydrophyllacearum (on Nemophila menziesii), G. orontii (on Nolana spp.), G. cf. orontii (on Tiarella cordifolia), Neoerysiphe cumminsiana (on Bidens cf. ferulifolia), Oidium clitoriae (on Clitoria ternatea), O. cf. hortensiae (on Philadelphus coronarius), O. pedilanthi (on Pedilanthus tithymaloides), Oidium (Pseudoidium) sp. (on Utricularia alpina), Podosphaera sp. (on Bergia capensis), Sawadaea bicornis (on Acer platanoides) and S. tulasnei (on Acer ginnala and A. tatarica) are recorded from France, Germany, Greece and Mexico.
Y1  - 2008
ER  - 
TY  - BOOK
A1  - Braun, Uwe
A1  - Ale-Agha, Nosratollah
A1  - Bolay, Adrien
A1  - Boyle, H.
A1  - Brielmaier-Liebetanz, U.
A1  - Emgenbroich, D.
A1  - Kruse, J.
A1  - Kummer, Volker
T1  - New records of powdery mildew fungi (Erysiphaceae)
N2  - The conidial stage and chasmothecia of Golovinomyces orontii have been found in Germany on cultivated Limnanthes douglasii. A powdery mildew anamorph found in the Netherlands on Malva alcea agrees morphologically with the Oidium of the latter species as well. Golovinomyces sp. (anamorph) on Parthenium integrifolium is described and discussed. Erysiphe sp. has been found in Germany on Acer opalus, and E. magnifica is recorded from Germany and Switzerland on Magnolia spp. Oidium passiflorae is new to Switzerland. An Oidium morphologically agreeing with the anamorph of Podosphaera aphanis has recently been collected on Exacum macranthum cultivated in a greenhouse, and conidiophores and conidia of a species of Podosphaera sect. Sphaerotheca subsect. Magnicellulatae (P. fusca complex) on Phlox paniculata and Polemonium caeruleum have been found in Germany.
Y1  - 2009
ER  - 
TY  - BOOK
A1  - Braun, Uwe
A1  - Jage, Horst
A1  - Kummer, Volker
A1  - Zimmermann, Holger
T1  - Podosphaera cf. pruinosa on Rhus hirta in Germany
N2  - The introduction of a new powdery mildew disease on Rhus hirta in various parts of Germany (Brandenburg, Rhine- Westphalia, Sachsen-Anhalt and Saxony) is reported. The anamorph found on this host agrees well with the North American Podosphaera pruinosa. Although the teleomorph has not yet been found in Germany and a molecular study has not yet been possible due to the lack of fresh North American material for a comparison, there is little doubt that the European outbreak of the Rhus powdery mildew disease may be referred to as Podosphaera pruinosa. Morphology, taxonomy and distribution of Podosphaera species on Rhus and other hosts of the Anacardiaceae are discussed in detail.
Y1  - 2008
ER  - 
TY  - BOOK
A1  - Gräf, Ralf
T1  - Das dynamische Cytoskelett eines einfachen Modellorganismus : Antrittsvorlesung 2007-12-06
N2  - Die Arbeitsgruppe von Ralph Gräf befasst sich mit der Rolle der Mikrotubuli bei dynamischen Bewegungsvorgängen der Zelle. Mikrotubuli sind röhrenförmige Elemente des Zellskeletts, die alle von einem zentralen Ort in der Nähe des Zellkerns, dem Centrosom, auswachsen und von dort organisiert werden. Neben ihrer Funktion als Transportweg für zahlreiche Substanzen und Zellorganelle spielen sie eine zentrale Rolle bei der Zellteilung, indem sie mit dafür sorgen, dass die Erbsubstanz korrekt auf die Tochterzellen verteilt wird. Den Schwerpunkt der Forschungsarbeiten bildet die Charakterisierung neuer Komponenten des Centrosoms und neuer Mikrotubuli- bindender Proteine im einfachen Modellsystem der Dictyostelium Amöbe. Diese Arbeiten sind von großer Bedeutung für die Erklärung Zellskelett-assoziierter Krankheiten und Störungen der geordneten Zellteilung, wie sie beispielsweise in Krebszellen auftritt.
Y1  - 2007
UR  - http://info.ub.uni-potsdam.de/multimedia/show_projekt.php?projekt_id=20
PB  - Univ.-Bibl.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Wartenberg, Maria
T1  - Über Nutzen und Grenzen der Stammzellenforschung : Antrittsvorlesung 2006-07-06
N2  - Die Referentin erläutert den Ursprung embryonaler Stammzellen und woher sie kommen. Gezeigt wird weiter unter anderem die Gewinnung embryonaler Stammzellen aus der Blastozyste der Maus, und es wird auf die Differenzierung von glatter Muskulatur und Knochen eingegangen. Die Wissenschaftlerin sieht in der Etablierung neuer in vitro Modelle eine große Perspektive für die Forschung mit Maus-Stammzellen.
Y1  - 2006
UR  - http://info.ub.uni-potsdam.de/multimedia/show_projekt.php?projekt_id=12
PB  - Univ.-Bibl.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Kummer, Volker
T1  - Historie der Krausnicker Kirche
Y1  - 1992
PB  - Fata-Morgana-Verl.
CY  - Berlin
ER  - 
TY  - BOOK
A1  - Kummer, Volker
T1  - Notizen zur Pflanzenwelt des NSG "Alter Nuthelauf"
Y1  - 1993
ER  - 
TY  - BOOK
ED  - Rogge, Detlev
T1  - Helgoland-Praktikum : Ergebnisse des zoologisch-meeresbiologischen Praktikums mit Studierenden der Universität Potsdam an der Biologischen Anstalt Helgoland
Y1  - 1994
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Klopfer, Klaus
A1  - Pifrement, Wolfgang
T1  - Aronstabgewächse für Haus und Garten
Y1  - 1994
PB  - Urania-Verl.
CY  - Leipzig [u.a.]
ER  - 
TY  - BOOK
A1  - Scharf, Peter
T1  - Wegweiser durch die Gewächshäuser und Freilandanlagen des Botanischen Gartens der Universität Potsdam
Y1  - 1994
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
ED  - Bayrhuber, Horst
ED  - Etschenberg, K.
ED  - Gehlhaar, K.-H.
ED  - Grönke, Ottokar
ED  - Klee, R.
ED  - Kühnemund, H.
T1  - Interdisziplinäre Themenbereiche und Projekte im Biologieunterricht : 9. Fachtagung der Sektion Fachdidaktik im VDBiol vom 19.9. bis 24.9.1993 in Ludwigsfelde
T3  - Institut für die Pädagogik der Naturwissenschaften : IPN
Y1  - 1994
SN  - 3-89088-086-X
VL  - 142
PB  - IPN
CY  - Kiel
ER  - 
TY  - BOOK
A1  - Holtzhauer, Martin
T1  - Biochemische Labormethoden
Y1  - 1995
PB  - Springer
CY  - Berlin
ER  - 
TY  - BOOK
ED  - Walz, Bernd
ED  - Somlyo, Avril D.
T1  - Calcium and vision : collected papers and reviews
Y1  - 1995
ER  - 
TY  - BOOK
ED  - Holtzhauer, Martin
T1  - Methoden in der Proteinanalytik
Y1  - 1996
PB  - Springer
CY  - Berlin
ER  - 
TY  - BOOK
A1  - Bergstedt, Christel
A1  - Grönke, Ottokar
A1  - Meincke, Irmtraut
T1  - Biologie : Lehrbuch für Sekundarstufe II ; Gymnasium, Gesamtschule ; Lehrerband mit Kopiervorlagen
Y1  - 1996
SN  - 3-06-012155-9
PB  - Volk u. Wissen
CY  - Berlin
ER  - 
TY  - BOOK
ED  - Scheller, Frieder W.
T1  - Frontiers in biosensorics : 1. Fundamental aspects
Y1  - 1997
SN  - 3-7643-5475-5
VL  - 80
PB  - Birkhäuser
CY  - Basel, Boston, Berlin
ER  - 
TY  - BOOK
ED  - Scheller, Frieder W.
T1  - Frontiers in biosensorics : 2. Practical applications
Y1  - 1997
SN  - 3-7643-5479-8
VL  - 81
PB  - Birkhäuser
CY  - Basel, Boston, Berlin
ER  - 
TY  - BOOK
A1  - Pfeil, Wolfgang
T1  - Protein stability and folding : a collection of thermodynamic data
Y1  - 1998
SN  - 3-540-63717-6
PB  - Springer
CY  - Berlin
ER  - 
TY  - BOOK
ED  - Rösing, Friedrich Wilhelm
ED  - Greil, Holle
ED  - Henneberg, Maciej
ED  - Schultz, Michael
T1  - Homo : journal of comparative human biology
Y1  - 1998
SN  - 0018-442X
PB  - Urban & Fischer
CY  - Jena
ER  - 
TY  - BOOK
ED  - Pette, Dirk
ED  - Fürst, Dieter Oswald
T1  - Reviews of Physiology, Biochemistry and Pharmacology
Y1  - 1999
PB  - Springer
CY  - Heidelberg
ER  - 
TY  - BOOK
A1  - Bresler, Vladimir
A1  - Bissinger, Vera
A1  - Abelson, Avigdor
A1  - Dizer, Halmi
A1  - Sturm, Armin
A1  - Kraetke, Renate
A1  - Fishelson, Lev
A1  - Hansen, Peter-Diedrich
T1  - Marine molluscs and fish as biomarkers of pollution stress in littoral regions of the Red Sea, Mediterranean Sea and North Sea
N2  - The intensive development of industry and urban structures along the seashores of the world, as well as the immense increase in marine transportation and other activities, has resulted in the deposition of thousands of new chemicals and organic compounds, endangering the existence of organisms and ecosystems. The conventional single biomarker methods used in ecological assessment studies cannot provide an adequate base for environmental health assessment, management and sustainability planning. The present study uses a set of novel biochemical, physiological, cytogenetic and morphological methods to characterize the state of health of selected molluscs and fish along the shores of the German North Sea, as well as the Israeli Mediterranean and Red Sea. The methods include measurement of activity of multixenobiotic resistance-mediated transporter (MXRtr) and the system of active transport of organic anions (SATOA) as indicators of antixenobiotic defence; glutathione S-transferase (GST) activity as an indicator of biotransformation of xenobiotics; DNA unwinding as a marker of genotoxicity; micronucleus test for clastogenicity; levels of phagocytosis for immunotoxicity; cholinesterase (ChE) activity and level of catecholamines as indicators of neurotoxicity; permeability of external epithelia to anionic hydrophilic probe, intralysosomal accumulation of cationic amphiphilic probe and activity of non-specific esterases as indicators of cell/tissue viability. Complete histopathological examination was used for diagnostics of environmental pathology. The obtained data show that the activity of the defensive pumps, MXRtr and SATOA in the studied organisms was significantly higher in the surface epithelia of molluscs from a polluted site than that of the same species from control, unpolluted stations, providing clear evidence of response to stress. Enhanced frequency of DNA lesions (alkaline and acidic DNA unwinding) and micronucleus-containing cells was significantly higher in samples from polluted sites in comparison to those from the clean sites that exhibited genotoxic and clastogenic activity of the pollutants. In all the studied molluscs a negative correlation was found between the MXRtr levels of activity and the frequency of micronucleus-containing hemocytes. The expression of this was in accordance with the level of pollution. The complete histopathological examination demonstrates significantly higher frequencies of pathological alterations in organs of animals from polluted sites. A strong negative correlation was found between the frequency of these alterations and MXRtr activity in the same specimens. In addition to these parameters, a decrease in the viability was noted in molluscs from the polluted sites, but ChE activities remained similar at most sites. The methods applied in our study unmasked numerous early cryptic responses and negative alterations of health in populations of marine biota sampled from the polluted sites. This demonstrates that genotoxic, clastogenic and pathogenic xenobiotics are present and act in the studied sites and this knowledge can provide a reliable base for consideration for sustainable development
Y1  - 1999
ER  - 
TY  - BOOK
A1  - Kühling, Matthias
A1  - Kummer, Volker
T1  - Bemerkenswerte Flechtenfunde aus Brandenburg IV
Y1  - 1999
ER  - 
TY  - BOOK
A1  - Vilcinskas, Andreas
T1  - Einheimische Süßwasserfische : alle Arten ; Merkmale, Verbreitung, Lebensweise
Y1  - 1999
SN  - 3-8289-1510-8
PB  - Bechtermünz
CY  - Augsburg
ER  - 
TY  - BOOK
A1  - Vilcinskas, Andreas
T1  - Heimische Aquarienfische
T3  - Ihr Hobby
Y1  - 2000
SN  - 3-933646-50-2
VL  - 42
PB  - bede-Verl.
CY  - Ruhmannsfelden
ER  - 
TY  - BOOK
A1  - Vilcinskas, Andreas
T1  - Fische : mitteleuropäische Süßwasserarten und Meeresfische der Nord- und Ostsee
T3  - BVL-Bestimmungsbuch
Y1  - 2000
SN  - 3-405-15848-6
PB  - BLV-Verl.-Ges
CY  - München
ER  - 
TY  - BOOK
A1  - Vilcinskas, Andreas
T1  - Meerestiere der Tropen : ein Bestimmungsbuch für Taucher, Schnorchler und Aquarianer ; über 700 niedere Tiere, Fische, Reptilien und Säuger
T3  - Kosmos Naturführer
Y1  - 2000
SN  - 3-440-07943-0
PB  - Kosmos
CY  - Stuttgart
ER  - 
TY  - BOOK
ED  - Greil, Holle
T1  - Schnittstelle Mensch-Umwelt in Vergangenheit, Gegenwart und Zukunft : Proceedings 3. Kongress der Gesellschaft für Anthropologie (GfA), Göttingen, den 1. - 3. Oktober 1998
Y1  - 2000
SN  - 3-89712-961-2
PB  - Cuvillier
CY  - Göttingen
ER  - 
TY  - BOOK
A1  - Siering, Günter
A1  - Beier, Wolfgang
T1  - Zum Vorkommen von Bockkäfern (Col., Cerambicidae) im Gebiet des ehemaligen GUS-Truppenübungsplatzes "Dallgow-Döberitz" bei Potsdam, 1. Nachtrag
Y1  - 2001
ER  - 
TY  - BOOK
A1  - Beier, Wolfgang
A1  - Heilmann, Dieter
T1  - Wiederfund von Meloe coriarius (Brandt&Erichson, 1832 (Col., Meloidae) für Deutschland sowie Nachweise weiterer bemerkenswerter Käferarten bei Lebus an der Oder (Land Brandenburg)
Y1  - 2001
ER  - 
TY  - BOOK
A1  - Pfeil, Wolfgang
T1  - Protein stability and folding : a collecton of thermodynamic data ; Supplement 1
Y1  - 2001
SN  - 3-540-42168-8
PB  - Springer
CY  - Berlin
ER  - 
TY  - BOOK
ED  - Wallschläger, Hans-Dieter
ED  - Mrzljak, Jadranka
ED  - Wiegleb, Gerhard
T1  - Offenland und Sukzession : Tagungsband zum Symposium 6 der 32. Jahrestagung der Gesellschaft für Ökologie in Cottbus vom 16. - 20. September 2002
T3  - Aktuelle Reihe / Brandenburgische Technische Universität Cottbus
Y1  - 2002
VL  - Fakultät Umweltwissenschaften un
PB  - Eigenverl. der BTU
CY  - Cottbus
ER  - 
TY  - BOOK
A1  - Wollenberger, Ursula
A1  - Renneberg, Reinhard
A1  - Bier, Frank Fabian
A1  - Scheller, Frieder W.
T1  - Analytische Biochemie : eine praktische Einführung in das Messen mit Biomolekülen
Y1  - 2003
SN  - 3-527-30166-6
PB  - John Wiley & Sons
CY  - Hoboken
ER  - 
TY  - BOOK
A1  - Burkart, Michael
A1  - Dierschke, Hartmut
A1  - Hölzel, Norbert
A1  - Nowak, Bernd
A1  - Fartmann, Thomas
T1  - Molinio-Arrhenatheretea = Kulturgrasland und verwandte Vegetationstypen. Teil 2: Molinietalia
T3  - Synopsis der Pflanzengesellschaften Deutschlands
Y1  - 2004
SN  - 1433-8440
VL  - 9
PB  - Selbstverl. der Floristisch-Soziologischen Arbeitsgemeinschaft
CY  - Göttingen
ER  - 
TY  - BOOK
A1  - Gaedke, Ursula
A1  - Seifried, Angelika
A1  - Adrian, Rita
T1  - Biomass size spectra and plankton diversity in a shallow eutrophic lake
N2  - Biomass size spectra collate structural and functional attributes of plankton communities enabling standardised temporal and cross-system comparisons and may be rapidly obtained by automated particle counters. To examine how differences in plankton communities from highly eutrophic and more oligotrophic lakes are reflected in size spectra, a three-year time series of biomass size spectra was established for polymictic, eutrophic Lake Müggelsee, based on approximately weekly sampling and microscopic enumeration. The continuous but often bumpy size spectra reflected appropriately the seasonal and trophy-related variations in the plankton composition and growth conditions and the potential impact of daphnids on smaller plankton. We tested the hypothesis that more diverse plankton communities have smoother size spectra than impoverished ones. The spectra of L. Müggelsee and other more less eutrophic lakes covaried roughly with the functional diversity in total plankton composition but were unrelated to taxonomical diversity within the phyto- or mesozooplankton. The slopes of the normalised size spectra of Lake Müggelsee were generally more negative than -1, exhibited a recurrent seasonal pattern, and were strongly correlated with crustacean biomass. In contrast to less eutrophic systems, slopes could not be used to quantify energy fluxes within the foodweb due to highly variable algal P/B ratios and frequently bumpy size distributions. The latter indicated stronger deviations from the ideal concept of a steady energy flow along the size gradient than found in e. g. large, mesotrophic Lake Constance.
Y1  - 2004
SN  - 1434-2944
ER  - 
TY  - BOOK
A1  - Gaedke, Ursula
A1  - Wickham, Steve
T1  - Ciliate dynamics in response to changing biotic and abiotic conditions in a large, deep lake (L. Constance)
N2  - During 1987-1998, the ciliates and their prey and predator communities in large, deep, mesotrophic Lake Constance were intensively studied as it underwent re-oligotrophication. Ciliate biomass exhibited the bimodal seasonal distribution typical for meso-eutrophic lakes, with high biomass in spring and summer and low biomass in winter and during the clear-water phase. Cluster analysis produced nine groups of temporally co-occurring ciliate morphotypes with potentially similar ecological characteristics. The clusters exhibited a larger seasonality than found in the size distribution, showing that similarly-sized ciliates had seasonally compensatory dynamics. Ciliate biomass declined by approx. 30 % during the 12 years of study, i.e. considerably less than daphnids (and total phosphorus). This yielded a significant increase in the ratio between summer ciliate and daphnid biomass as re-oligotrophication progressed, in contrast to previous studies. Few indications for a mechanistic link between phosphorus concentrations (which declined threefold during the study period) and ciliate biomass or community composition via group-specific food concentrations were found. The relative contribution of three of the nine clusters changed as re-oligotrophication progressed. Ciliate size distribution was related to reoligotrophication and daphnid biomass in summer. The smallest and largest ciliates gained in importance when daphnids decreased whereas large ciliates declined. Overall, summer daphnid biomas had a greater predictive power for attributes of the ciliate community than the other factors studied (phosphorus, prey biomass, copepod biomass). The extent of bottom-up and top-down control of ciliates appeared to be time and group specific. Overall, the ciliate community exhibited remarkably recurrent seasonal patterns despite major alternations in abiotic and biotic conditions.
Y1  - 2004
SN  - 0948-3055
ER  - 
TY  - BOOK
A1  - Abel, Markus
A1  - Holschneider, Matthias
T1  - Modellierung und Datenbankanalyse komplexer Systeme Teil 8 : Vorlesung 2009-06-25
N2  - Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.
Y1  - 2009
UR  - http://info.ub.uni-potsdam.de/multimedia/show_projekt.php?projekt_id=43
PB  - Univ.-Bibl.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Smertenko, P.
A1  - Fenenko, L.
A1  - Brehmer, Ludwig
A1  - Schrader, Sigurd
T1  - Differential approach to the study of integral characteristics in polymer films
N2  - The differential approach is based on the determination of dimensionless differential slope, for instance, of current-voltage characteristics (IVC), I=f(V). This slope (a) is given by formula alpha=d(lgI)/d(lgV). With such definition the ranges of constancy of the a(V) dependency correspond to the part of IVC characterized by the power behaviour (I similar to V-alpha). The differential slope of alpha(V) dependency gamma = d(lg alpha)/dlgV determines the exponent behaviour of curve (I similar to exp {eV(y)/kT}). Processing by the differential approach of the investigated theoretical or experimental characteristics permits us to determine the peculiarity of charge flow mechanisms, temperature behaviour of conductivity, etc. The theoretical base and some applications of differential approach to the investigation of the current-voltage, temperature and degradation characteristics of the polyaniline and poly(p- phenilenevinilene) based structures have been shown. (c) 2005 Elsevier B.V. All rights reserved
Y1  - 2005
ER  - 
TY  - BOOK
A1  - Muzikante, I.
A1  - Fonavs, E.
A1  - Brehmer, Ludwig
A1  - Stiller, Burkhard
T1  - Photoinuced phenomena in corona poled polar organic films
N2  - Organic materials have received considerable attention because of their large dipole moments and optical nonlinearities. The optically induced switching of material properties is important for studying the optoelectronic effects including second harmonic generation. Organic materials for photonic applications contain chromophore dipole which consist of acceptor and donor groups bridged by a delocalized pi-electron system. Both theoretical and experimental data show a reversible highly dipolar photoinduced intra molecular charge transfer in betaine type molecules accompanied by change of the sign and the value of the dipole moment. The arrangement of polar molecules in films is studied both by atom force microscopy and surface potential measurements. To understand the photo response of these materials, their spectroscopic and electrical properties are studied. The morphology and photoinduced surface potential switching of the self-assembled monolayers and polymer films are investigated. (c) 2005 Elsevier B.V. All rights reserved
Y1  - 2005
ER  - 
TY  - BOOK
A1  - Schulz, Burkhard
A1  - Orgzall, Ingo
A1  - Freydank, Anke-Christine
A1  - Chenggang, Xü
T1  - Self-organization of substituted 1,3,4-oxadizazoles in the solid state and at surfaces
N2  - Different aspects of the structure formation for a class of molecules containing the diphenyl-1,3,4-oxadiazole fragment are discussed. Starting from the bulk state with the ideal crystal lattice and the derivation of some common packing motifs the formation of liquid-crystalline states are described. This leads to the consideration of structures found in Langmuir-Blodgett films and those obtained by organic molecular beam deposition. These structures may again be compared to those for the bulk crystalline state. Common features as well as characteristic differences due to peculiarities of the individual molecular structures are discussed. (c) 2005 Elsevier B.V. All rights reserved
Y1  - 2005
ER  - 
TY  - BOOK
A1  - Köchy, Martin
T1  - Opposite trends in life stages of annual plants caused by daily rainfall variability - interaction with climate change
N2  - Global Circulation Models of climate predict not only a change of annual precipitation amounts but also a shift in the daily distribution. To improve the understanding of the importance of daily rain pattern for annual plant communities, which represent a large portion of semi-natural vegetation in the Middle East, I used a detailed, spatially explicit model. The model explicitly considers water storage in the soil and has been parameterized and validated with data collected in field experiments in Israel and data from the literature. I manipulated daily rainfall variability by increasing the mean daily rain intensity on rainy days (MDI, rain volume/day) and decreasing intervals between rainy days while keeping the mean annual amount constant. In factorial combination, I also increased mean annual precipitation (MAP). I considered five climatic regions characterized by 100, 300, 450, 600, and 800 mm MAP. Increasing MDI decreased establishment when MAP was >250 mm but increased establishment at more arid sites. The negative effect of increasing MDI was compensated by increasing mortality with increasing MDI in dry and typical Mediterranean regions (c. 360-720 mm MAP). These effects were strongly tied to water availability in upper and lower soil layers and modified by competition among seedlings and adults. Increasing MAP generally increased water availability, establishment, and density. The order of magnitudes of MDI and MAP effects overlapped partially so that their combined effect is important for projections of climate change effects on annual vegetation. The effect size of MAP and MDI followed a sigmoid curve along the MAP gradient indicating that the semi-arid region (?300 mm MAP) is the most sensitive to precipitation change with regard to annual communities.
Y1  - 2006
UR  - http://www.martinkoechy.de/research/papers/Koechy2006.pdf
ER  -