TY - JOUR A1 - Ette, Ottmar T1 - Unterwegs zum Weltbewußtsein : Alexander von Humboldts Antwort auf Globalisierung Y1 - 2001 ER - TY - JOUR A1 - Ette, Ottmar T1 - Humor e irreverencia : Reinaldo Arenas Y1 - 2001 ER - TY - JOUR A1 - Ette, Ottmar T1 - Un espíritu de inquietud moral : Humboldtian writing: Alexander von Humboldt y la escritura en la modernidad Y1 - 2001 ER - TY - JOUR A1 - Nierhaus, Michael T1 - Sparkassen vor nationalen und europäischen Herausforderungen Y1 - 2001 ER - TY - BOOK ED - Sabrow, Martin T1 - Die Grenzen der Entgrenzung : zehn Jahre Deutsche Einheit T3 - Helmstedter Colloquien Y1 - 2001 VL - 3 PB - Akademie Verl.-Anst. CY - Leipzig ER - TY - BOOK A1 - Sabrow, Martin T1 - Herr und Hanswurst : das tragische Schicksal des Hofgelehrten Jacob Paul von Gundling Y1 - 2001 SN - 3-421-05512-2 PB - Dt. Verl.-Anst CY - Stuttgart ER - TY - JOUR A1 - Wilson, J. S. A1 - Chawdhury, Nazia A1 - Al-Mandhary, Muna R. A. A1 - Younus, M. A1 - Khan, Muhammad S. A1 - Raithby, Paul R. A1 - Friend, Richard H. T1 - The energy gap law for triplet States in Pt-containing conjugated polymers and monomers Y1 - 2001 ER - TY - JOUR A1 - Ette, Ottmar T1 - Sánchez, Y., Coleccionismo y literatura; Madrid, Cátedra, 1999 BT - Coleccionismo y literatura Y1 - 2001 ER - TY - JOUR A1 - Rolfes, Manfred A1 - Klein, Ralf T1 - Fachmethodische Anforderungen in der Praxis : empirische Forschungsergebnisse und konzeptionelle Überlegungen zur Methodikausbildung Y1 - 2001 ER - TY - JOUR A1 - Horstkemper, Marianne T1 - Qualitätszirkel als Instrument der Schulentwicklung : Kooperationsfeld für (Fach-)Didaktik und Schulpädagogik N2 - Vortrag zum 4. Tag der Fachdidaktiken an der Universität Potsdam am 15. Mai 200 Y1 - 2001 UR - http://www.uni-potsdam.de/u/zlb/kentron/kentron.html ER - TY - JOUR A1 - Wacker, Alexander A1 - von Elert, Eric T1 - Polyunsaturated fatty acids : evidence for non-substitutable biochemical resources in daphnia galeata N2 - The factors that determine the efficiency of energy transfer in aquatic food webs have been investigated for many decades. The plant-animal interface is the most variable and least predictable of all levels in the food web. In order to study determinants of food quality in a large lake and to test the recently proposed central importance of the long-chained eicosapentaenoic acid (EPA) at the pelagic producer-grazer interface, we tested the importance of polyunsaturated fatty acids (PUFAs) at the pelagic producer-consumer interface by correlating sestonic food parameters with somatic growth rates of a clone of Daphnia galeata. Daphnia growth rates were obtained from standardized laboratory experiments spanning one season with Daphnia feeding on natural seston from Lake Constance, a large pre-alpine lake. Somatic growth rates were fitted to sestonic parameters by using a saturation function. A moderate amount of variation was explained when the model included the elemental parameters carbon (r2 = 0.6) and nitrogen (r2 = 0.71). A tighter fit was obtained when sestonic phosphorus was incorporated (r2 = 0.86). The nonlinear regression with EPA was relatively weak (r2 = 0.77), whereas the highest degree of variance was explained by three C18-PUFAs. The best (r2 = 0.95), and only significant, correlation of Daphnia's growth was found with the C18-PUFA a-linolenic acid (a-LA; C18:3n-3). This correlation was weakest in late August when C:P values increased to 300, suggesting that mineral and PUFA- limitation of Daphnia's growth changed seasonally. Sestonic phosphorus and some PUFAs showed not only tight correlations with growth, but also with sestonic alpha-LA content. We computed Monte Carlo simulations to test whether the observed effects of alpha-LA on growth could be accounted for by EPA, phosphorus, or one of the two C18-PUFAs, stearidonic acid (C18:4n-3) and linoleic acid (C18:2n-6). With >99% probability, the correlation of growth with alpha-LA could not be explained by any of these parameters. In order to test for EPA limitation of Daphnia's growth, in parallel with experiments on pure seston, growth was determined on seston supplemented with chemostat-grown, Plimited Stephanodiscus hantzschii, which is rich in EPA. Although supplementation increased the EPA content 80-800x, no significant changes in the nonlinear regression of the growth rates with alpha-LA were found, indicating that growth of Daphnia on pure seston was not EPA limited. This indicates that the two fatty acids, EPA and alpha-LA, were not mutually substitutable biochemical resources and points to different physiological functions of these two PUFAs. These results support the PUFA-limitation hypothesis for sestonic C:P < 300 but are contrary to the hypothesis of a general importance of EPA, since no evidence for EPA limitation was found. It is suggested that the resource ratios of EPA and alpha-LA rather than the absolute concentrations determine which of the two resources is limiting growth. Y1 - 2001 UR - http://www.esajournals.org/esaonline/?request=get-abstract&issn=0012-9658&volume=082&issue=09&page=2507 ER - TY - JOUR A1 - Hark, Sabine T1 - Normalisierte Wissenschaft? : zum herrschaftskritischen Potential von Frauen- und Geschlechterforschung Y1 - 2001 SN - 3-89691-214-3 ER - TY - JOUR A1 - Fischer, Markus T1 - The role of vegetative spread and seed dispersal for optimal life histories of clonal plants : a simulation study Y1 - 2001 ER - TY - JOUR A1 - Fischer, Markus A1 - Müller-Schärer, H. T1 - Genetic structure of the annual weed Senecio vulgaris in relation to habitat type and population size Y1 - 2001 ER - TY - JOUR A1 - Fischer, Markus A1 - Kéry, M. A1 - Matthies, D. T1 - The effect of plant population size on the interactions between the rare plant Gentiana cruciata and its specialized herbivore Maculinea rebeli Y1 - 2001 ER - TY - JOUR A1 - Giest, Hartmut T1 - Bildung und Medien Y1 - 2001 ER - TY - BOOK A1 - Kapanadze, David A1 - Schulze, Bert-Wolfgang T1 - Crack theory and edge singularities : Chapter I T3 - Preprint / Universität Potsdam, Institut für Mathematik, Arbeitsgruppe partiell Y1 - 2001 SN - 1437-739x PB - Univ. CY - Potsdam ER - TY - JOUR A1 - Schöler, Klaus T1 - Öffentliche Unternehmen aus raumwirtschaftlicher Sicht Y1 - 2001 SN - 3-8100-2839-8 ER - TY - JOUR A1 - Horstkemper, Marianne T1 - Gender Mainstreaming als Prinzip geschlechterdifferenzierender Arbeit in der Jugendhilfe - Auftrieb für geschlechterbewusste Pädagogik oder Konkurrenz für bereits entfaltete Reformkonzepte Y1 - 2001 UR - http://www.stiftung-spi.de/download/stiftung/gender/gender.pdf SN - 3-92 4061-58-0 ER - TY - JOUR A1 - Grözinger, Elvira T1 - Als Andenken an ihr Leben : Fotografien aus Auschwitz ; ein Gedenkbuch Y1 - 2001 ER -