Metabolic Changes Associated with Endo- Crine Activity and the Reproductive Cycle in Xenopus Laevis Iii. Changes in the Calcium Content of the Serum Associated with Captivity and the Normal Reproductive Cycle by H. Zwarenstein and H. A. Shapiro
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چکیده
IN a previous paper (Shapiro and Zwarenstein, 1933) it was shown that castration in Xenopus laevis results after 6 months in a persistent fall in serum calcium in males and females. During the course of the investigation it was observed that the serum calcium of the females used as controls, i.e. animals maintained in captivity, was significantly lower than that of animals brought in fresh from the ponds. The ovaries of captive females were severely atrophied after 6 months' captivity and often presented the appearance of gelatinous masses in which individual ova were no longer discernible on naked-eye examination. On the other hand, the normal ovaries of pond animals at the height of the breeding season are filled with large ova easily visible macroscopically. An account of the histological and other changes in the ovaries associated with captivity and hypophysectomy will be published later. In striking contrast to the females, the serum calcium of males kept in captivity for 6 months did not differ significantly from that of pond male toads examined at the same time. No macroscopic changes were observed in testes of the captive males. The correlation between ovarian retrogression and decreased serum calcium of animals kept in captivity and the seasonal changes in serum calcium and ovarian activity of animals in their natural environment were more fully investigated. The results of this investigation, extending over 12 months, form the subject of the present paper.
منابع مشابه
Metabolic Changes Associated with Endo- Crine Activity and the Reproductive Cycle in Xenopus Laevis Ii. the Effect of Hypophysectomy on the Potassium Content of the Serum
THE ease and rapidity with which the whole pituitary or part of the gland can be removed in Xenopus laevis, the low post-operative mortality and the fact that the animals survive the operation for more than two years, suggested an investigation into the relation between the pituitary and several metabolic variables. In a previous paper (Shapiro and Zwarenstein, 1933) the effect of hypophysectom...
متن کاملMetabolic Changes Associated with Endo- Crine Activity and the Reproductive Cycle in Xenopus Laevis Iv. the Effects of Injection of Ovarian and Pituitary Extracts on the Serum Calcium in Normal, Ovari- Ectomised and Hypophysectomised Toads
AN account of the previous literature dealing with the effects of ovarian and pituitary extracts on the calcium content of the serum will be found in the review by Zwarenstein(i934). In a previous paper of this series (Shapiro and Zwarenstein, 1933) it was shown that ovariectomy caused a persistent fall in the serum calcium of female Xenopus. Removal of the anterior lobe alone, or of both lobes...
متن کاملMetabolic Changes Associated with Endo- Crine Activity and the Reproductive Cycle in Xenopus Laevis I. the Effects of Gonadectomy and Hypophysectomy on the Calcium Content of the Serum
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تاریخ انتشار 2005