Vertical versus planar neural induction in Rana pipiens embryos.
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 کاملInduction of photolyase activity in wood frog (Rana sylvatica) embryos.
Rising ultraviolet-B (UVB, 280-320 nm) radiation has been proposed as a factor which may explain nonnormal amphibian population declines. Accordingly research has been directed toward estimating the photolyase activity of several amphibian species in order to predict a species' resilience to UV damage. Unfortunately, in spite of published research which demonstrated that the activity of one of ...
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 کاملInduction of Cytochrome P450-associated Monooxygenases in Northern Leopard Frogs, Rana Pipiens, by 3,39,4,49,5-pentachlorobiphenyl
Northern leopard frogs (Rana pipiens) were injected intraperitoneally either with a solution of polychlorinated biphenyl (PCB) 126 in corn oil at a concentration of 0.2, 0.7, 2.3, or 7.8 mg/kg body weight or with corn oil alone. Appropriate assay conditions with hepatic microsomes were determined for four cytochrome P450-associated monooxygenases: ethoxyresorufin-Odealkylase (EROD), methoxy-ROD...
متن کاملEye-specific segregation requires neural activity in three-eyed Rana pipiens.
The addition of a third eye primordium to the forebrain region of a Rana pipiens embryo invariably results in the development of a series of periodic, mutually exclusive eye-specific bands in tectal lobes dually innervated by the host and supernumerary fibers. A number of investigators have proposed that such source-specific segregation arises as a compromise between two mechanisms that are nor...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1994
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.91.8.3049