Changes at the Surface of Nereis Limbata Eggs After Insemination
نویسندگان
چکیده
منابع مشابه
Changes at the Surface of Nereis Li Mb at a Eggs after Insemination
ONE of the classic descriptions of the insemination process is that of F. R. Lillie (1911) in the egg of the annelid, Nereis. According to Lillie, there exists beneath the vitelline membrane of the unfertilized Nereis egg a wide cortical layer. He describes it as "a coarsely alveolar layer with homogeneous alveolar contents. The walls of the alveoli are continuous internally with the protoplasm...
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Unfertilized eggs of the marine worm Nereis limbata subjected to electrical currents (direct or alternating) undergo remarkable changes. Certain minute granules just inside the surface of the egg absorb water and swell to more than 300 times their original size and thereby produce a mass of jelly which surrounds the egg with a zone about as wide as the original diameter of the egg. The amount o...
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1. The problem of the relation of the plasma membrane to the extraneous coats and cortex of the Nereis egg is discussed in the light of the observations of Lillie, Chambers, and Novikoff. 2. Evidence obtained from experiments with the centrifuge, and by treating eggs with alkaline sodium chloride, indicates that the plasma membrane of the unfertilized egg is external to the jelly precursor gran...
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Long-time vs. short-time insemination of sibling eggs.
This study aimed to evaluate the impact of a short insemination procedure on embryo development, assess the reliability of a fertilization check prior to the appearance of pronuclei and elucidate the role of rescue intracytoplasmic sperm injection (R-ICSI). Patients who had ≥9 eggs, were aged <38 years and had normal semen samples were included. The sibling eggs of each patient were divided int...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1939
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.16.4.403