On the Vitelline Membrane of the Egg of Psammechinus Miliaris and of Teredo Norvegica
نویسنده
چکیده
منابع مشابه
Sperm 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 کاملMeasuring Ca2+-signalling at fertilization in the sea urchin Psammechinus miliaris: alterations of this Ca2+-signal by copper and 2,4,6-tribromophenol.
During fertilization, eggs undergo a temporary rise in the intracellular concentration of free Ca(2+) ions. Using the membrane permeable acetoxymethylester of the fluorescent calcium indicator dye Fura-2, Fura-2 AM, the Ca(2+)-signal at fertilization was not detectable in eggs of the sea urchin Psammechinus miliaris. However, after treatment of the eggs with Fura-2 AM in combination with MK571,...
متن کاملFatty acid compositions of gonadal material and diets of the sea urchin, Psammechinus miliaris: trophic and nutritional implications.
The fatty acid compositions of gonadal material was examined for the sea urchin Psammechinus miliaris (Gmelin) held in aquaria and fed either salmon feed pellets or the macroalga, Laminaria saccharina for 18 months. Gonadal material was also examined from P. miliaris collected from four field sites, including commercial scallop lines encrusted with the mussel, Mytilus edulis, sea cages stocked ...
متن کاملThe fertilization reaction in the sea-urchin egg; the effect of nicotine.
After insemination of unfertilized eggs of Psammechinus miliaris, a change in cortical structure is propagated over the egg surface. A quantitative examination of this phenomenon (Rothschild & Swann, 1949) raised the following questions, requiring further experiments. First, is the observed cortical change the block to polyspermy, or is there a more rapid and so far undetected block to polysper...
متن کاملSex-specific biochemical and histological differences in gonads of sea urchins (Psammechinus miliaris) and their response to phenanthrene exposure.
Female and male individuals of the same species often differ with respect to their susceptibility to toxicant stress. In the present study, sea urchins (Psammechinus miliaris) of both sexes were exposed to high (150 μg L⁻¹) and environmentally relevant (5 μg L⁻¹) concentrations of phenanthrene over 10 days. While food intake was significantly decreased following exposure to 150 μg L⁻¹ phenanthr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2005