Results 141 to 150 of about 6,405 (190)
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Molecular adaptation of Daphnia magna hemoglobin
Micron, 2004Daphnia 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 +2 more
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Transcriptional atlas of Daphnia magna
Comparative Biochemistry and Physiology Part D: Genomics and ProteomicsTranscriptomics 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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Phylogeography of Daphnia magna in Europe
Molecular Ecology, 2005AbstractThe 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, 1966Abstract 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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Evolution of cadmium resistance in Daphnia magna
Environmental Toxicology and Chemistry, 2005Abstract 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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Effect of Lindane on the Clearance Rate of Daphnia magna
Archives of Environmental Contamination and Toxicology, 1999The impact of the insecticide lindane (gamma-hexachlorocyclohexane) on the clearance rate (CR) of Daphnia magna was investigated using artificial beads. CR (24-h EC50: 65 &mgr;g L-1) was found to be a more sensitive endpoint than acute lethality for D. magna (48-h LC50: 516 &mgr;g L-1).
Hartgers, E.M. +2 more
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Hydrobiologia, 1978
This paper deals with some methods for breeding Daphnia magna. Critical variables are the filtration of the medium on charcoal, the composition of the medium, the amount of food, the addition of vitamins with yeast extract and the extent of refreshing the medium. If these variables are well controlled, breeding daphnia is easy with reproduction varying
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This paper deals with some methods for breeding Daphnia magna. Critical variables are the filtration of the medium on charcoal, the composition of the medium, the amount of food, the addition of vitamins with yeast extract and the extent of refreshing the medium. If these variables are well controlled, breeding daphnia is easy with reproduction varying
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Application of Daphnia magna for Nanoecotoxicity Study
2018Daphnia 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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Haemoglobin in male Daphnia magna
Comparative Biochemistry and Physiology Part A: Physiology, 1989Abstract 1. 1. To define the respiratory function of haemoglobin in male Daphnia magna , the swimming activity, the depression of oxygen uptake by treatment with carbon monoxide and in vivo oxygenation of Hb at various oxygen pressures were investigated. 2. 2. The P 50 , values for the purified Hbs from male and female red animals were 2.
Kobayashi Michiyori +4 more
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Sub-lethal effects of acetone on Daphnia magna
Ecotoxicology, 2007There is increasing concern about the sub-lethal effect of hydrophobic chemicals in the water medium. Even though acetone is a commonly used solvent in toxicity testing, few studies have focussed on its chronic toxicity to Daphnia magna and the available results are often contradictory. In this study, acetone was tested on D. magna in a 21-day exposure
LEONI, BARBARA +2 more
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