Timing of Birth in Syrian Hamsters1
نویسندگان
چکیده
منابع مشابه
Inability of Vitamin A Deficiency to Alter Benzo(a)pyrene Metabolism in Syrian Hamsters1
Syrian golden hamsters were placed on a control or vitamin A-deficient diet. When their serum vitamin A content was significantly reduced, i.e., to less than 10% of controls, the hamsters were killed and lung aryl hy drocarbon hydroxylase activity and metabolism of benzo(a)pyrene were determined. The benzo(a)pyrene metabolite profile was similar with control and A-deficient systems, and only fe...
متن کاملStability of circadian timing with age in Syrian hamsters.
The causes of age-related disruptions in the timing of human sleep and wakefulness are not known but may include changes in both the homeostatic and circadian regulation of sleep. In Syrian hamsters the free running period of the circadian activity/rest rhythm has been reported to shorten with age. Although this has been observed under a variety of experimental conditions, the changes have been...
متن کاملProgesterone Receptor Levels in Estrogen-induced Renal Carcinomas after Serial Passage beneath the Renal Capsule of Syrian Hamsters1
Elevated concentrations of progesterone receptor, a sensitive indicator of estrogen responsiveness, have been measured in this study during early serial transplan tation of estrogen-induced renal adenocarcinoma tissue in hamsters. A new approach of tumor transplantation beneath the renal capsule has been used. Fragments of primary tumor tissue transplanted subpannicularly in es trogen-treated h...
متن کاملRapid Induction of Subcutaneous Fibrosarcoma by 7,12-Dimethyl- benz(a)anthracene in an Inbred Line of Syrian Hamsters1
Single s.c. injections of 500 ^g 7,12-dimethylbenz(a)anthracene in tricaprylin were given to 25 males and 25 females of 10 inbred strains of Syrian hamsters. In 9 strains, the average time of latency before palpable tu mors appeared was 13 to 16 weeks. In 1 strain, BIO 15.16, the average latency was 10 weeks. These differ ences are statistically significant. In this line, the first palpable tum...
متن کاملOxytocin in the Circadian Timing of Birth
BACKGROUND The molecular components determining the timing for birth remain an incompletely characterized aspect of reproduction, with important conceptual and therapeutic ramifications for management of preterm, post-term and arrested labor. METHODOLOGY/PRINCIPAL FINDINGS To test the hypothesis that oxytocin mediates circadian regulation of birth, we evaluated parturition timing following sh...
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ژورنال
عنوان ژورنال: Biology of Reproduction
سال: 1992
ISSN: 0006-3363,1529-7268
DOI: 10.1095/biolreprod47.1.6