Survival of Rana pipiens in Deionized Water
نویسندگان
چکیده
منابع مشابه
The Epidermis of Rana Pipiens
The epidermis of adult Rana pipiens has been studied by electron microscopy and histological and histochemical methods. It was found that the epidermis is engaged in the production of both keratin and mucus. The basal cells are mainly filled with tonofilaments, whereas the cells located in the mid-portion of the epidermis contain both tonofilaments and mucous granules. Golgi vesicles and endopl...
متن کاملAnaerobiosis in the Rana pipiens Embryo
BRACHET (1934,1950) has proposed that the oxidation source for the anaerobic development of the early amphibian embryo is primarily from a pool of materials such as oxidized glutathione. Inasmuch as an investigation of the defective lactate producing ability of hybrid embryos (Barth, 1946) was contemplated, it seemed desirable to reinvestigate the problem of the source of anaerobic oxidations i...
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...
متن کاملChronic, dietary polybrominated diphenyl ether exposure affects survival, growth, and development of Rana pipiens tadpoles.
Levels of polybrominated diphenyl ethers (PBDEs) in the environment have been increasing rapidly over the past two decades; however, the toxicology of these compounds to aquatic organisms is poorly understood. Because amphibians play a role in both aquatic and terrestrial food webs, and are currently undergoing worldwide population declines, it is of interest to determine how PBDEs may affect a...
متن کاملThe 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 ...
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ژورنال
عنوان ژورنال: Science
سال: 1972
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.178.4057.183