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31.
L. Wei?flog K. Wienhold D. Martinetz K. -D. Wenzel H. -I. Spie? 《Umweltwissenschaften und Schadstoff-Forschung》1990,2(3):126-128
Untersuchungen anMyriophyllum verticillatum, Potamogeton natans undNymphaea alba in Seen unterschiedlicher Trophiestufen best?tigen, da? in humin- und fulvo-s?urereichen Seen auch bei erh?htem Schwermetallangebot
bei einer Reihe von metallen niedrigere Biokonzentrationsfaktoren als in huminstoffarmen Seen zu verzeichnen sind. 相似文献
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Werner Brack Rolf Altenburger Falk Dorusch Andreas Hubert Monika Möder Peter Morgenstern Susanne Moschütz Sibylle Mothes Kristin Schirmer Rainer Wennrich Klaus -Dieter Wenzel Gerrit Schüürmann 《Environmental Sciences Europe》2002,14(4):213-220
In August 2002, highly contaminated areas in the region of Bitterfeld, e.g. the floodplain of the creek Spittelwasser, as well as the adjacent regions of Jeßnitz and Raguhn, were submerged by the river Mulde. An input of mobilized contaminated sediments in residential areas was the matter of concern. The objective of the present study was to estimate the pollutants load on the basis of chemical and biological data and identify the sources of pollutants. Deposited sludge and flood water samples were assessed on the basis of biological and chemical analyses and in comparison with administrative reference values. The pollution of the investigated sites was rather heterogeneous. At several sites, tolerance limits of the German Klärschlammverordnung or the Bundesbodenschutzverordnung were clearly exceeded, e.g. for Pb, As and HCH. Organic extracts exhibited significant effects in several biotests. This may be relevant with respect to direct particle uptake via ingestion or respiration. Pollution patterns for heavy metals as well as for organic pollutants differed significantly from the pattern found in the Spittelwasser flood plain before the inundation, which is in contrast to the initial hypothesis of a possible transport of contaminated Spittelwasser sediments into residential areas. Interestingly, a correlation of chemical load and the overall biological effect could be shown. From the viewpoint of the precautionary principle, the identification of the compounds exerting toxic effects and of the respective pollutant sources would be desirable. 相似文献
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J. J. Wenzel M. Schemmerer H. Oberkofler H. Kerschner P. Sinha C. Koidl F. Allerberger 《Food and environmental virology》2014,6(4):297-300
We tested 19 sera from Austrian patients with acute hepatitis A. A serum from a 48-year-old female patient yielded HAV-nucleic acid that showed 99.7 % homology to the HAV-sequence obtained from samples taken during the current outbreak in several European countries, which is associated with consumption of frozen berries. So far, Austria was considered not to be affected by this hepatitis A outbreak. 相似文献
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A simple model based on feedback mechanisms is developed to describe the dynamics of brood production and colony development
of primitively eusocial paper wasps. The presence of pupae and empty cells stimulate egg laying, which varies between a basic
rate and a physiological maximum. Newly hatched larvae are fed eggs, causing fluctuations in brood demography and forming
cohorts of offspring. The basic feedback mechanisms produce emergent colony-level properties such as synchronized development
of the brood and mature nest size. Results suggest that it is incorrect to imply colony decline from lack of nest growth,
and that production of waves of offspring can be interpreted as the inevitable result of these simple feedback mechanisms
rather than the solution to ultimate optimality criteria. Simulations using the parameters estimated in Polistes dominulus Christ are compared to studies of live wasps to test the validity of the model. Comparing simulated results with a perturbation
experiment in nature suggests that feedback relationships establish a system that is robust and resilient against severe disturbance.
Received: 20 January 1996/Accepted after revision: 27 April 1996 相似文献
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Hriskova K. Marosevic D. Belting A. Wenzel J. J. Carl A. Katz K. 《Food and environmental virology》2021,13(3):337-346
Food and Environmental Virology - In the last decade, the number of reported hepatitis E virus (HEV) infections in Germany, including Bavaria, has continued to rise. In order to identify risk... 相似文献
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