27 research outputs found

    Impact of Ocean Acidification on Energy Metabolism of Oyster, Crassostrea gigas—Changes in Metabolic Pathways and Thermal Response

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    Climate change with increasing temperature and ocean acidification (OA) poses risks for marine ecosystems. According to Pörtner and Farrell [1], synergistic effects of elevated temperature and CO2-induced OA on energy metabolism will narrow the thermal tolerance window of marine ectothermal animals. To test this hypothesis, we investigated the effect of an acute temperature rise on energy metabolism of the oyster, Crassostrea gigas chronically exposed to elevated CO2 levels (partial pressure of CO2 in the seawater ~0.15 kPa, seawater pH ~ 7.7). Within one month of incubation at elevated Pco2 and 15 °C hemolymph pH fell (pHe = 7.1 ± 0.2 (CO2-group) vs. 7.6 ± 0.1 (control)) and Peco2 values in hemolymph increased (0.5 ± 0.2 kPa (CO2-group) vs. 0.2 ± 0.04 kPa (control)). Slightly but significantly elevated bicarbonate concentrations in the hemolymph of CO2-incubated oysters ([HCO− 3]e = 1.8 ± 0.3 mM (CO2-group) vs. 1.3 ± 0.1 mM (control)) indicate only minimal regulation of extracellular acid-base status. At the acclimation temperature of 15 °C the OA-induced decrease in pHe did not lead to metabolic depression in oysters as standard metabolism rates (SMR) of CO2-exposed oysters were similar to controls. Upon acute warming SMR rose in both groups, but displayed a stronger increase in the CO2-incubated group. Investigation in isolated gill cells revealed a similar temperaturedependence of respiration between groups. Furthermore, the fraction of cellular energy demand for ion regulation via Na+/K+-ATPase was not affected by chronic hypercapnia or temperature. Metabolic profiling using 1H-NMR spectroscopy revealed substantial changes in some tissues following OA exposure at 15 °C. In mantle tissue alanine and ATP levels decreased significantly whereas an increase in succinate levels was observed in gill tissue. These findings suggest shifts in metabolic pathways following OA-exposure. Our study confirms that OA affects energy metabolism in oysters and suggests that climate change may affect populations of sessile coastal invertebrates such as mollusks

    The Cult of the Body

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    In ihrer Studie, die auf ihrer im Jahr 2002 am Fachbereich fĂŒr Politikwissenschaft der Humboldt-UniversitĂ€t zu Berlin vorgelegten Dissertation basiert, befasst sich Paula Diehl mit dem politischen Imaginarium des Nationalsozialismus. Sie spĂŒrt Entstehung und Gebrauch von Selbst- und Fremdbildern im politischen Diskurs nach. Dabei nehmen die Idealkörperbilder der SS und die Mythoskonstruktion des „Ariers“ einen zentralen Platz ein. Diehl interpretiert sie als Folie fĂŒr die Visualisierung der nationalsozialistischen Utopie des „Neuen Menschen“. Die Autorin analysiert mit Hilfe eines innovativen interdisziplinĂ€ren Zugangs auf der Grundlage politik- und kulturwissenschaftlicher Methoden die Instrumentalisierung der SS-Körperbilder fĂŒr die Vermittlung rassistischer Ideale und die Inszenierung von Herrschaft. Ihr Buch schließt damit eine ForschungslĂŒcke.In her work, based on her dissertation for the department of political science presented in 2002 to the Humboldt University Berlin, Paula Diehl addresses the political imaginary of National Socialism. She investigates the creation and use of images of the self and the other in political discourse where the ideal bodies of the SS and the mythos of the “Aryan” play a central role. Diehl interprets them as a screen onto which the visualization of the National Socialist utopia of the “New Human” was projected. Using an interdisciplinary approach with methods from political and cultural studies, the author analyses the instrumentalization of the SS body images for the communication of racist ideals and the performance of power

    Witches—Construction and Function of a Myth

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    Felix Wiedemann legt mit seiner Dissertation eine Studie ĂŒber moderne Hexenbilder vor. Auf der Grundlage einer umfassenden Quellenarbeit analysiert er Entwicklung und Rezeption von Hexenvorstellungen im 19. und 20. Jahrhundert. Bekannte Motive sind dabei die Hexe als weise Frau und als Verfolgte, die gegen christliche Traditionen rebelliert. Wiedemann untersucht den Stellenwert des Hexenmythos als ProjektionsflĂ€che fĂŒr SehnsĂŒchte, Ideale, Selbst- und Fremdbilder. Er konzentriert sich dafĂŒr auf die völkische Bewegung, das Neuheidentum und den Feminismus und arbeitet Parallelen der jeweiligen Hexenrekurse heraus. Zum verbindenden Moment dieser so unterschiedlichen Bewegungen erklĂ€rt Wiedemann die Dominanz eines positiven Hexenbildes, dessen Ursprung er auf literarische und mythologische Konstrukte des 19. Jahrhunderts zurĂŒckfĂŒhrt.Felix Wiedemann’s dissertation presents a study of modern images of witches. Based on comprehensive work with sources he analyses the development and reception of the witch conception in the 19th and 20th centuries. Familiar motifs include the witch as a wise woman and as a persecuted woman who rebels against Christian traditions. Wiedemann examines the significance of the witch myth as a screen onto which desires, ideals, and images of the self and the other are projected. In so doing, he concentrates on the folk movement, new paganism, and feminism and teases out parallels between the respective recourse to the witch image in each. Wiedemann sees the dominance of a positive image of the witch as the unifying moment of these otherwise so varied movements, an image which according to Wiedemann has its origin in literary and mythological constructs of the 19th century

    BeschÀftigungswirkungen der Vereinbarkeit von Beruf und Familie

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    BESCHÄFTIGUNGSWIRKUNGEN DER VEREINBARKEIT VON BERUF UND FAMILIE BeschĂ€ftigungswirkungen der Vereinbarkeit von Beruf und Familie / Rump, Jutta (Rights reserved) ( -

    Employability Management

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    EMPLOYABILITY MANAGEMENT Employability Management / Rump, Jutta (Rights reserved) ( -
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