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 - 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 - 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 - 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 - 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 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 - 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 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 - 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 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 -