Results 181 to 190 of about 32,854 (216)

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
openaire   +2 more sources

Sex Determination in Daphnia Magna

Ecology, 1990
The factors inducing male offspring and the mechanism of sex—ratio adjustment were investigated in Daphnia magna, a cyclically parthenogenetic cladoceran (Crustacea). Laboratory experiments were conducted on individual animals living in flow—through chambers, to separate the effects of various density—dependent factors.
Anders Hobaek, Peter Larsson
openaire   +1 more source

Haemoglobin in male Daphnia magna

Comparative Biochemistry and Physiology Part A: Physiology, 1989
Abstract 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, Tanaka Yuko, Ninomiya Masaki, Fujiki Masahiko, Ochiai Takehiko   +4 more
openaire   +1 more source

Breeding Daphnia magna

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
openaire   +1 more source

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
openaire   +2 more sources

Cadmium resistance in Daphnia magna

Aquatic Toxicology, 1990
Abstract The potential of the water-flea Daphnia magna to develop resistance to cadmium was investigated. Three successive generations of daphnids were exposed to sublethal cadmium concentrations, and thereafter the cadmium resistance was assessed in acute LC50-tests. Resistance to cadmium was found to be acquired during a single generation.
C.W.M. Bodar, I. van der Sluis, J.C.P. van Montfort, P.A. Voogt, D.I. Zandee   +4 more
openaire   +1 more source

Carbamate Bioassay Using Daphnia magna

Journal of Economic Entomology, 1970
A bioassay for detection and determination of minute quantities of carbamate insecticides in fruit and vegetable crops was developed with Daphnia magna Straus. The Daphnia bioassay was quick, simple to prepare, reproducible, and proved more sensitive to carbamates than that for Drosophila melanogaster Meigen.
Bruce L. Parker, James E. Dewey, Carl A. Bache   +2 more
openaire   +1 more source

Transcriptome alterations in female Daphnia (Daphnia magna) exposed to 17β-estradiol

Environmental Pollution, 2020
The molecular mechanism of evaluating 17β-estradiol (E2)-induced toxicity in female Daphnia magna has not been determined. In this study, the transcriptome of D. magna was analyzed after exposure to three different concentrations (0, 10, and 100 ng L-1) of E2 at 3, 6, and 12 h.
Yao, Zheng, Julin, Yuan, Zhimin, Gu, Guang, Yang, Tian, Li, Jiazhang, Chen   +5 more
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources