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On the effect of adenosine triphosphoric acid and of Ca on the cytoplasm of the egg of the sea urchin, Psammechinus miliaris☆
TLDR
The curves obtained demonstrate that the rate of stratification is determined rather by rigidity of structure than by viscosity, probably by increasing the linkage between certain components of the cytoplasmic fabric. Expand
The cortical propagation of the activation impulse in the sea urchin egg
TLDR
It was inferred that the impulse caused by the sperm attachment primarily spreads in the cortical layer, and the primary action of the spermatozoon is considered to be propagated by a chain reaction, in which activateable units present in the cortex are concerned. Expand
Action of periodate on the surface reactions attending the activation of the egg of the sea urchin, Psammechinus miliaris☆
TLDR
It is inferred that underripeness is caused by the predominance of an inhibitor having a character similar to that of the jelly coat substance, and the belief is expressed that the inhibitory agent is deeply engaged in the whole activation process. Expand
The activation of the egg of the sea urchin Psammechinus miliaris by periodate
TLDR
The activation of the eggs by periodate occurred even in absence of Ca, and eggs activated subsequent to the periodate treatment exhibited the angular plasmolysis characteristic of fertilized eggs when immersed in a hypertonic medium. Expand
The gelating effect of lower doses of trypsin on sea urchin eggs and its removal by exposure to glutathione.
TLDR
The results indicate that the trypsin pretreatment promotes the activation of proteolytic enzymes present in the eggs, including glutathione, which has a gelating or polymerizing action on certain cytoplasmic components. Expand
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