CYTOLOGICAL ABNORMALITIES PRODUCED BY EXPERIMENTAL TEMPERATURE SHOCK ON TRITURUS TOROSUS EMBRYOS
نویسندگان
چکیده
منابع مشابه
Abnormalities in somite segmentation following heat shock to Xenopus embryos.
The typical abnormality induced by a 15 min shock at 37degreesC is a single discrete length along the somite file within which segmental boundaries are absent or irregular. The two sides of the same embryo present a similar but not necessarily identical appearance. Usually all the embryos in a treated batch show abnormalities of similar severity. Survival of treated embryos, the details of the ...
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Swiss albino and C57BL/10 eggs from induced ovulations, and spontaneously ovulated A eggs, were activated in vitro by a heat shock of 44 degrees C for 5 to 7-5 min and cultured in the presence of 10 mug/ml of Cytochalasin B (CB) for 5-8 h. The activation rate was about 70% in Swiss albino, 40% in C57BL and 90% in A eggs. CB suppressed second polar body (2P.B.) formation in over 90% of activated...
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BACKGROUND The aims of this study were to determine whether preimplantation exposure of mouse embryos to ammonium resulted in abnormal fetal development and to evaluate similar risks to the outcome of human assisted conception. METHODS Mouse embryos cultured from the 1-cell stage were exposed to 0.3 mmol/l ammonium chloride for 3 days. Embryos cultured from the 2-cell stage were exposed to 0....
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The presence of numerical chromosome abnormalities in human embryos was studied using fluorescence in-situ hybridization with four or more chromosome-specific probes. When most cells of an embryo are analysed, this technique allows differentiation to be made between aneuploidy, mosaicism, haploidy and polyploidy. Abnormal types of fertilization, such as unipronucleated, tripronucleated zygotes ...
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Using isolated presumptive ectoderm of the newt (Triturus pyrrhogaster) embryos as a reactor and extract of rat bone marrow as a mesodermal inductor, changes of cell number and mitotic index of the reactor cells were studied. In early stages of cultivation the increase in cell number in the mesodermalized ectodermal piece was slower than in the non-mesodermalized epidermal piece; but after 24 h...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1950
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1538593