文献检索，用中文搜 PubMed

Suppr 超能文献

核心技术专利：CN118964589B侵权必究

核心技术专利：CN118964589B侵权必究

Comp Biochem Physiol A Comp Physiol. 1991;98(2):241-3. doi: 10.1016/0300-9629(91)90527-j.

Zeitgebers for circannual rhythms have been elusive. Demonstration that an external factor is a zeitgeber requires proof of a phase-shift that endures for several years. 2. The California ground squirrel (Spermophilus beecheyi) is an ideal subject. Many features of behavior have circannual rhythms of which change in mass is the easiest to measure. The squirrels thrive in captivity for up to 10 years. The squirrels were kept in individual cages in an air conditioned room, fed lab chow ad lib, and weighed twice a month. They were exposed to a 6-month phase shift of (a) length of day (b) seasonal change in temperature, (c) both, (d) seasonal cycle of irradiance. 3. The squirrels maintained circannual rhythms for up to 9 years. Entrainment was evident only by squirrels exposed to seasonal change in irradiance.

用于年周期节律的授时因子一直难以捉摸。要证明一个外部因素是授时因子，需要有持续数年的相位偏移的证据。2. 加利福尼亚地松鼠（Spermophilus beecheyi）是一个理想的研究对象。许多行为特征具有年周期节律，其中体重变化是最容易测量的。这些松鼠在圈养环境中能存活长达10年。松鼠被饲养在空调房间的单独笼子里，随意喂食实验室饲料，每月称重两次。它们经历了以下6个月的相位偏移：（a）日照长度，（b）温度的季节性变化，（c）两者皆有，（d）辐照度的季节性周期。3. 这些松鼠保持了长达9年的年周期节律。只有暴露于辐照度季节性变化的松鼠才出现了明显的节律同步。

Comp Biochem Physiol A Comp Physiol. 1991;98(2):241-3. doi: 10.1016/0300-9629(91)90527-j.

Zeitgebers for circannual rhythms have been elusive. Demonstration that an external factor is a zeitgeber requires proof of a phase-shift that endures for several years. 2. The California ground squirrel (Spermophilus beecheyi) is an ideal subject. Many features of behavior have circannual rhythms of which change in mass is the easiest to measure. The squirrels thrive in captivity for up to 10 years. The squirrels were kept in individual cages in an air conditioned room, fed lab chow ad lib, and weighed twice a month. They were exposed to a 6-month phase shift of (a) length of day (b) seasonal change in temperature, (c) both, (d) seasonal cycle of irradiance. 3. The squirrels maintained circannual rhythms for up to 9 years. Entrainment was evident only by squirrels exposed to seasonal change in irradiance.

用于年周期节律的授时因子一直难以捉摸。要证明一个外部因素是授时因子，需要有持续数年的相位偏移的证据。2. 加利福尼亚地松鼠（Spermophilus beecheyi）是一个理想的研究对象。许多行为特征具有年周期节律，其中体重变化是最容易测量的。这些松鼠在圈养环境中能存活长达10年。松鼠被饲养在空调房间的单独笼子里，随意喂食实验室饲料，每月称重两次。它们经历了以下6个月的相位偏移：（a）日照长度，（b）温度的季节性变化，（c）两者皆有，（d）辐照度的季节性周期。3. 这些松鼠保持了长达9年的年周期节律。只有暴露于辐照度季节性变化的松鼠才出现了明显的节律同步。