Anaerobiosis in the segmenting eggs of Bufo arenarum.
نویسندگان
چکیده
منابع مشابه
A trypsin-like oviducal proteinase involved in Bufo arenarum fertilization.
When the jelly-less eggs removed from the most cephalic region of the oviduct (pars recta) of the toad Bufo arenarum were inseminated at a high sperm concentration, high frequencies of fertilization were obtained. On the other hand, control eggs removed from the pleuroperitoneal cavity (coelomic eggs)) were neither fertilized upon insemination under identical conditions, nor with the water extr...
متن کاملSperm concentration and fertilization rate in Bufo arenarum (Amphibia: Anura).
The influence of sperm concentration upon the fertilization rate of Bufo arenarum oocytes was determinated. The experimental results were analysed according to the theories of Rothschild and Swann, and Hultin and Hagström for Psammechinus miliaris. The experimental results agreed with the predictions of the latter theory. Since Bufo arenarum and Psammechinus miliaris oocytes differ in both size...
متن کاملActivation of spleen tyrosine kinase (Syk) at fertilization in Rhinella arenarum eggs.
Recently, we have provided evidence for the involvement of a cytosolic tyrosine-phosphorylatable 70 kDa oocyte protein in Rhinella arenarum (Anura: Bufonidae) fertilization. The aim of the present work was to characterize its phosphorylation, determine the identity of this protein and establish its biological role during the fertilization process. Tyrosine phosphorylation of the 70 kDa protein ...
متن کاملAcclimation to Low Level Exposure of Copper in Bufo arenarum Embryos: Linkage of Effects to Tissue Residues
The acclimation possibilities to copper in Bufo arenarum embryos was evaluated by means of three different low level copper exposure conditions during 14 days. By the end of the acclimation period the copper content in control embryos was 1.04 +/- 0.09 microg g(-1) (wet weight) while in all the acclimated embryos a reduction of about 25% of copper was found. Thus copper content could be conside...
متن کاملAntibacterial activity of lactose-binding lectins from Bufo arenarum skin.
Amphibians respond to microbial infection through cellular and humoral defense mechanisms such as antimicrobial protein secretion. Most humoral defense proteins are synthetized in the skin. In this study we isolated two beta-galactoside-binding lectins with molecular weights of 50 and 56 KDa from the skin of Bufo arenarum. These lectins have significant hemagglutination activity against trypsin...
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عنوان ژورنال:
- Journal of embryology and experimental morphology
دوره 15 1 شماره
صفحات -
تاریخ انتشار 1966