Synthesis of yolk in oocytes of rana pipiens after induced ovulation
نویسندگان
چکیده
منابع مشابه
The Origin of Protein and Fatty Yolk in Rana Pipiens
Study of living frog oocytes with the phase microscope has shown that the early yolk appears in two forms. One of these, the protein yolk, consists of thin, dense, plate-like bodies which in face view are almost always regular hexagons. The other form, the fatty yolk, occurs as clusters of globules of varying sizes. The plate-like bodies occur both singly and in clusters. As the oocytes mature ...
متن کاملEnvironmental influence on ovulation and embryonic development in Rana pipiens.
Environmental effects on ovulation and embryogenesis in Rana pipiens were assessed using both freshly-captured fall animals and laboratory-conditioned females which had undergone vitellogenesis in the laboratory. Frogs in both categories were divided into two groups. Ovulation was hormonally induced in one group of females prior to cold exposure and in the second group of animals following an 8...
متن کاملElectron Microscopy of Growing Oocytes of Rana Pipiens
1. In the cytoplasm of oocytes of stage Y(0), prior to the appearance of yolk, one observes a few scattered profiles of endoplasmic reticulum and numerous filamentous mitochondria, usually distributed at random but sometimes clustered. As the nuclear membrane begins to bulge outward, small granules and short rods appear in the perinuclear cytoplasm and endoplasmic reticulum becomes more promine...
متن کامل"Cleavage" and cortical granule breakdown in Rana pipiens oocytes induced by direct microinjection of calcium
Microinjection of approximately 0.3 mug of calcium into maturing oocytes of Rana pipiens after nuclear dissolution resulted in cleavage-like constrictions, cortical granule breakdown, and formation of a structure resembling a two-cell embryo. Mg2+, Na+, or K+ did not induce any of these reactions. Larger amounts of Ca2+-induced contraction over the entire surface of oocytes or eggs, but did not...
متن کاملThe initiation of protein synthesis in eggs of rana pipiens.
During amphibian o6genesis, small o6cytes in the first meiotic prophase undergo a prolonged growth period resulting in the formation of fully developed o6cytes which have greatly increased in size. The injection of a pituitary suspension into mature females stimulates the release of the full-grown o6cytes from the ovary and the breakdown of their large nuclei (germinal vesicles). The ovulated e...
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ژورنال
عنوان ژورنال: Journal of Morphology
سال: 1953
ISSN: 0362-2525,1097-4687
DOI: 10.1002/jmor.1050920304