此外，羚牛昼夜活动节律和时间分配方面的差异在年龄上也有所体现。
There were difference in active rhythm and time budget between individuals in different ages among the four radio-collared takins.
几乎自然界中所有的物种，从单细胞生物到哺乳动物(包括人类)，都具有一种日常活动周期，称为昼夜节律。
Virtually all species in nature, from single-cell organisms to mammals, including humans, exhibit a daily cycle of activity called circadian rhythm.
在20世纪初，科学家们发现，动物也有昼夜节律：即使没有如光线之类的外部变化的提示，动物也能保持一个24小时的活动周期。
In the early 1900s scientists found that animals have circadian rhythms, too: they also are capable of maintaining a 24-hour-long activity pattern in the absence of external cues such as light.
最被熟知的，德库西说，是生理的或昼夜节律像睡眠-清醒节律、每日活动节律、或者乘坐飞机旅行的时差感和轮班工作病。
The best-known ones, DeCoursey says, are circadian or daily rhythms such as the sleep-wake rhythm, daily activity rhythms, or jet lag and shift-work maladies.
虽然在昼夜节律中，人与人具有个体差异，但人类基本上都是在白天活动的。
While there are some individual differences in the circadian rhythm, where some individuals are more nocturnal than others, humans are basically a diurnal (day-living) species.
科学家们曾认为昼夜节律的调节是受基因活动支配，但海藻和红细胞中都不含DNA。
Scientists had previously thought the circadian clock was driven by gene activity, but both the algae and the red blood cells kept time without it.
飞翔活动有明显的昼夜节律。
核桃含有褪黑激素——一种能调节昼夜周期节律的神经激素，能帮助你得到应对白天活动所需的休息。
Walnuts are rich in melatonin, a neurohormone which regulates the circadian rhythm of your sleep-wake cycle and helps you to get the rest you need to face the day.
结果表明，蒙古羊一年四季的昼夜行为活动节律和牧食行为不同。
The feed intake and water intake of Mongolia sheep and palatability indices of various plants grazed by the sheep were measured.
结果表明，蒙古羊一年四季的昼夜行为活动节律和牧食行为不同。
The feed intake and water intake of Mongolia sheep and palatability indices of various plants grazed by the sheep were measured.
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