INFLUENCE OF ORGANISM AGE ON METAL TOXICITY TO DAPHNIA MAGNA

2007 ◽  
Vol 26 (6) ◽  
pp. 1198 ◽  
Author(s):  
Tham C. Hoang ◽  
Stephen J. Klaine
Keyword(s):  
Daphnia Magna ◽  
Metal Toxicity

Liposomes as an alternative delivery system for investigating dietary metal toxicity to Daphnia magna

2011 ◽  
Vol 105 (3-4) ◽  
pp. 661-668 ◽  
Author(s):  
Roel Evens ◽  
Karel A.C. De Schamphelaere ◽  
Lieve Balcaen ◽  
Yingying Wang ◽  
Karen De Roy ◽  
...  
Keyword(s):  
Daphnia Magna ◽  
Delivery System ◽  
Metal Toxicity ◽  
Alternative Delivery

Performance of standard media in toxicological assessments with Daphnia magna: chelators and ionic composition versus metal toxicity

Ecotoxicology ◽  
2010 ◽  
Vol 20 (1) ◽  
pp. 139-148 ◽  
Author(s):  
Cláudia Loureiro ◽  
Bruno B. Castro ◽  
Joana Luísa Pereira ◽  
Fernando Gonçalves
Keyword(s):  
Daphnia Magna ◽  
Metal Toxicity ◽  
Ionic Composition

Two-Compartment Toxicokinetic–Toxicodynamic Model to Predict Metal Toxicity in Daphnia magna

2012 ◽  
Vol 46 (17) ◽  
pp. 9709-9715 ◽  
Author(s):  
Qiao-Guo Tan ◽  
Wen-Xiong Wang
Keyword(s):  
Daphnia Magna ◽  
Metal Toxicity

Membrane-bound vesicles associated with the microvilli in the midgut of the freshwater microcrustacean, Daphnia magna

1983 ◽  
Vol 41 ◽  
pp. 480-481
Author(s):  
Patricia L. Jansma
Keyword(s):  
Daphnia Magna ◽  
Intestinal Epithelial Cells ◽  
Uranyl Acetate ◽  
Intestinal Epithelial ◽  
Chlamydomonas Reinhardii ◽  
Thin Sections ◽  
Saturated Water ◽  
Cacodylate Buffer ◽  
Membrane Bound ◽  
Ethanol Series

The presence of the membrane bound vesicles or blebs on the intestinal epithelial cells has been demonstrated in a variety of vertebrates such as chicks, piglets, hamsters, and humans. The only invertebrates shown to have these microvillar blebs are two species of f1ies. While investigating the digestive processes of the freshwater microcrustacean, Daphnia magna, the presence of these microvillar blebs was noticed.Daphnia magna fed in a suspension of axenically grown green alga, Chlamydomonas reinhardii for one hour were narcotized with CO2 saturated water. The intestinal tracts were excised in 2% glutaraldehyde in 0.2 M cacodyl ate buffer and then placed in fresh 2% glutaraldehyde for one hour. After rinsing in 0.1 M cacodylate buffer, the sample was postfixed in 2% OsO4, dehydrated with a graded ethanol series, infiltrated and embedded with Epon-Araldite. Thin sections were stained with uranyl acetate and Reynolds lead citrate before viewing with the Philips EM 200.

Computer Reconstruction of the Cellular Architecture of the Daphnia Magna Optic Ganglion

1975 ◽  
Vol 33 ◽  
pp. 284-285
Author(s):  
E. R. Macagno ◽  
C. Levinthal
Keyword(s):  
Daphnia Magna ◽  
Genetic Background ◽  
Compound Eye ◽  
Synaptic Connectivity ◽  
Serial Sections ◽  
Cross Sectional ◽  
Small Crustacean ◽  
Optic Ganglion ◽  
Structural Invariance ◽  
High Degree

The optic ganglion of Daphnia Magna, a small crustacean that reproduces parthenogenetically contains about three hundred neurons: 110 neurons in the Lamina or anterior region and about 190 neurons in the Medulla or posterior region. The ganglion lies in the midplane of the organism and shows a high degree of left-right symmetry in its structures. The Lamina neurons form the first projection of the visual output from 176 retinula cells in the compound eye. In order to answer questions about structural invariance under constant genetic background, we have begun to reconstruct in detail the morphology and synaptic connectivity of various neurons in this ganglion from electron micrographs of serial sections (1). The ganglion is sectioned in a dorso-ventra1 direction so as to minimize the cross-sectional area photographed in each section. This area is about 60 μm x 120 μm, and hence most of the ganglion fit in a single 70 mm micrograph at the lowest magnification (685x) available on our Zeiss EM9-S.

Mise en évidence des effets sublétaux sur des populations de daphnies (Daphnia magna)

1981 ◽  
Vol 12 (1) ◽  
pp. 63-79
Author(s):  
R. Cabridenc ◽  
Bui Thi ◽  
H. Lepailleur
Keyword(s):  
Daphnia Magna
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