Pattern formation in artificially activated ectoderm (Rana pipiens and Ambystoma punctatum)
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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 کاملLaboratory studies bearing on pigment pattern polymorphisms in wild populations of Rana pipiens.
Data are presented for 2,393 progeny from a number of crosses related to a study in ecological genetics of the Burnsi and Kandiyohi polymorphisms in natural populations of the leopard frog, Rana pipiens. No significant differences in viability were found between wild-type homozygotes (+/+) and Burnsi heterozygotes (B/+) or homozygotes (B/B). Similarly, no difference in viability was found betwe...
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 ...
متن کاملAnatomy and Physiology of Vision in the Frog (Rana pipiens)
Frogs arc essentially dependent on vision. They fccd on worms, flies, and other insects which they catch directly with the mouth or by striking them with the tongue; for this they use only visual clues. Furthermore, frogs prey only on moving insects, and their attention is never attracted by stationary creatures or objects. Nor do they respond with feeding behavior to a large moving object, ins...
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ژورنال
عنوان ژورنال: Developmental Biology
سال: 1963
ISSN: 0012-1606
DOI: 10.1016/0012-1606(63)90122-2