Results 181 to 190 of about 76,951 (232)

A circadian rhythm in Daphnia magna

Oecologia, 1971
In 1963 Harris reported a circadian rhythm of 28 hours in Daphnia magna (Crustacea, Cladocera). Many endogenous periodicities have been described, mostly in vertebrates and plants, seldom in planktonic crustaceans, but a free-running period of 28 hours in continuous light is never a common phenomenon.
J, Ringelberg, Hanneke, Servaas
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Ecotoxicity of pp’DDE to Daphnia magna

Ecotoxicology, 2013
pp'-Dichlorodiphenyl-dichloroethylene (pp'DDE), a metabolite of pp'-dichlorodiphenyl-trichloroethane poses a risk for many ecosystems in spite of the banning of the parent compound because of its persistence and bioaccumulability. Nevertheless, the knowledge of acute and chronic toxicity on aquatic organisms is still very poor.
BETTINETTI, ROBERTA, Croce, V., Noè, F., Ponti, B., Quadroni, S., GALASSI, SILVANA   +5 more
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Macromolecular isoforms of Daphnia magna haemoglobin

Biological Chemistry, 2005
The haemoglobin (Hb) of Daphnia magna acclimated to different oxygen conditions was sampled, and in its natively assembled state it was separated by chromatofocusing. The Hb isoforms were analysed for their subunit composition under denaturating conditions by two-dimensional gel electrophoresis.
Tobias, Lamkemeyer, Rüdiger J, Paul, Walter, Stöcker, Irene, Yiallouros, Bettina, Zeis   +4 more
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Biotransformation and bioconcentration of pyrene in Daphnia magna

Aquatic Toxicology, 2003
Water fleas (Daphnia magna) were exposed to [14C]pyrene in the presence and absence of piperonyl butoxide (PBO), a general cytochrome P450 (CYP) inhibitor, in organic carbon-free artificial freshwater (AFW ...
Jarkko, Akkanen, Jussi V K, Kukkonen
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Phylogeography of Daphnia magna in Europe

Molecular Ecology, 2005
AbstractThe phylogeographical structure of the water flea Daphnia magna in Europe was analysed using a 609‐bp fragment of the cytochrome oxidase subunit I gene. Only moderate overall genetic divergence was detected within Europe. We detected four genetically and, to a large extent, geographically distinct phylogroups within Europe.
K, De Gelas, L, De Meester
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The detection of acute toxicity with Daphnia magna

Food and Cosmetics Toxicology, 1966
Abstract A useful biological detector for acute toxicity of minute samples of chemicals available from man's environment must be highly sensitive, easily cultured in large numbers and capable of rigid standardization. It should also provide highly reproducible results which, if possible, should parallel those from mammalian tests.
D G, Crosby, R K, Tucker, N, Aharonson
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Transcriptional atlas of Daphnia magna

Comparative Biochemistry and Physiology Part D: Genomics and Proteomics
Transcriptomics studies are more likely to achieve predictive results when they rely on tissue- and cell-specific transcriptional data. Identification of cell types in novel model organisms by their transcriptional profiles is difficult without data on transcriptional differences among major tissues and anatomical features.
Ishaan Dua, Lev Yampolsky
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Molecular adaptation of Daphnia magna hemoglobin

Micron, 2004
Daphnia magna responds to changing environmental conditions impeding aerobic metabolism by synthesizing hemoglobin of adequate quantity and quality to maintain oxygen supply of the tissues. Hemoglobin subunit composition and its oxygen affinity were analyzed as a function of temperature as well as depending on the oxygen partial pressure of the medium.
Bettina, Zeis, Tobias, Lamkemeyer, Rüdiger J, Paul   +2 more
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Application of Daphnia magna for Nanoecotoxicity Study

2018
Daphnia magna (D. magna), an aquatic invertebrate, is the most commonly used test organism in ecotoxicological studies on manufactured nanomaterials (MNs). Although standard protocols for undertaking acute and chronic toxicity tests of dissolved chemicals with D.
Zhizhen, Xu, Yingying, Liu, Yuqian, Wang
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Evolution of cadmium resistance in Daphnia magna

Environmental Toxicology and Chemistry, 2005
Abstract A diverse laboratory population of Daphnia magna Straus was established by combining individuals from eight sources. Artificial selection for increased resistance to the acute toxic effects of cadmium was performed, and after eight generations, the average median effective concentration increased from 61 to 180 μg/L.
Timothy J, Ward, William E, Robinson
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