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vitelline membrane

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
vitelline membrane
n.
1. The membrane that develops around an oocyte in insects, mollusks, amphibians, and birds.
2. The zona pellucida.

vitelline membrane
n
(Life Sciences & Allied Applications / Zoology) Zoology a membrane that surrounds a fertilized ovum and prevents the entry of other spermatozoa


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enteritidis is not often deposited inside the nutrient-rich yolks of naturally contaminated eggs, penetration by the bacteria through the vitelline membrane into the yolk could result in a rapid increase in bacterial levels.
Degeneration of the vitelline membrane was evident at all treatment levels; severity was dose-related and greater in the outer vitelline membrane than the inner vitelline membrane.
20-26) The high resistance at blastula stage to physico chemical stress, enhanced in free living embryos by protective barriers like the vitelline membrane and jelly coats, provide support for the argument that its reflects very aggressive environmental conditions during the evolution of early multicellular organisms.
 
 
 
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