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Download PDF by Sardul S. Guraya: Ovarian Follicles in Reptiles and Birds

By Sardul S. Guraya

ISBN-10: 3642836283

ISBN-13: 9783642836282

ISBN-10: 3642836305

ISBN-13: 9783642836305

In 1954, while I got my B. Sc. (Honours tuition) measure in Zoology, i used to be requested by way of my consultant, the past due Professor Vishwa Nath, to make comparative cytological experiences of oogenesis in birds for my M. Sc. (Honours tuition) thesis submitted to the Panjab collage in 1956. utilizing the classical recommendations of cytology, I studied many of the facets of follicle development and atresia in 5 species of birds. Professor Vishwa Nath, who himself committed so much of his existence to the research of the comparative cytology of gametogenesis in animals, used to be a lot inspired by way of my findings on avian oogenesis that he requested me to proceed my study paintings for the Ph. D. measure less than his supervision. in the course of my study paintings on avian oogenesis, I turned a great deal attracted to extra comparative learn of ovarian follicles in vertebrates and therefore determined to make comparative, morphological and histochemical reports of ovarian follicles in reptiles, birds and mammals. truly, little or no info used to be to be had during this regard in 1957 whilst i began operating for the Ph. D. measure. In next years, I and my various committed and hugely prompted M. Sc. and Ph. D. scholars con­ tinued to make comparative, morphological, histochemical, biochemical and physiological stories of ovarian follicles in all teams of vertebrates. In reference to the topic of this e-book, i need to make distinct point out of my significant scholars, specifically Dr. S. ok. Varma and Dr. R. K.

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Additional resources for Ovarian Follicles in Reptiles and Birds

Example text

The simultaneous formation of ribosomal bodies and the disappearance of lipid bodies composed of triglycerides and phospholipids suggest a close physiological relationship between them. From this discussion, it can be concluded that protein synthesis and lipid metabolism of previtellogenic follicles are suspended during hibernation of lizards and snakes in response to low environmental tem45 perature, and thus further follicle growth is inhibited, possibly as a result of low levels of gonadotrophins.

Guraya (1961). , cobra (Naja tripudians) and krait (Bungarus caeruleus) (Figs. 6) and meanwhile growth ceases. Similarly, lipid bodies of previtellogenic oocytes in the spiny-tailed lizard, Uromastix hardwickii, also disappear during hibernation (Guraya 1982a). This observation supports the suggestion that their presence in the actively growing follicles before hibernation is, therefore, closely related to the growth processes (Guraya 1963, 1965b, 1968, 1976c, 1977c). Corresponding to the disappearance of lipid bodies during hibernation, the basophilic material of yolk nucleus consisting of RNA, protein and lipoproteins, forms conspicuous aggregations of variable size (Fig.

2 Birds The spherical nucleus of very young oocytes contains one or two small nucleoli which consist of RNA and protein, and thick diplotene chromosomes (Fig. 4A, B, C, D) (Guraya 1976a; Chalana and Guraya 1979a). The chromatin material in the nucleus of very young oocytes is in the form of filaments that stain for DNA and protein (Guraya 1976a). With the initiation of oocyte growth, the nucleus greatly increases in size by accumulating more nuclear sap; meanwhile, the nuclear components, such as the chromosomes, nucleoli and spherical bodies, undergo very conspicuous morphological and chemical changes (Fig.

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Ovarian Follicles in Reptiles and Birds by Sardul S. Guraya

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