仓鼠睾丸的光周期调节：对昼夜节律的依赖性。

Abstract

The testes of hamsters exposed to short days (10 hr of light per day) regress within 13 weeks. Administration of 7.5% deuterium oxide to hamsters lengthens the period of free running circadian activity rhythms by 2.2% and prevents testicular regression during short-day exposure. This consistent with predictions derived from an external coincidence model for photoperiodic time measurement: Deuterium oxide changes phase relationships between the light-dark cycle and the circadian system, the hamster's daily photosensitive phase is stimulated with light during short days, and the testes remain large. Conservation of the period of circadian rhythms within narrow limits has adaptive significance for hamster photoperiodism and for the occurrence and phasing of the annual reproductive cycle.

摘要

暴露于短日照（每天光照10小时）的仓鼠睾丸在13周内会退化。给仓鼠施用7.5%的氧化氘可使自由运行的昼夜节律活动周期延长2.2%，并防止短日照期间睾丸退化。这与从光周期时间测量的外部巧合模型得出的预测一致：氧化氘改变了明暗周期与昼夜节律系统之间的相位关系，在短日照期间仓鼠的每日光敏期受到光照刺激，睾丸保持较大状态。昼夜节律周期在狭窄范围内的保持对仓鼠的光周期现象以及年度生殖周期的发生和阶段具有适应性意义。

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