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KMID : 0894520080120010009
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Development & Reproduction
2008 Volume.12 No. 1 p.9 ~ p.18
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A Limit Cycle Model about the Entrainment of Circadian Rhythm
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Choi Don-Chan
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Abstract
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All the organisms on the earth are affected by the repeating signals from the ambient environment caused by the movements of the sun and the earth. Their physiological and behavioral activities such as reproduction, functional pathway of various molecules, and developmental stage, are reflected by the cyclicity whether it is daily(circadian) or annual rhythms. An essential function of circadian rhythms is to provide an internal estimate of the external local time, thereby allowing the organism to program its activities so that they occur at an appropriate time in the daily environment. Of many rhythmic patterns, the circadian rhythms are considered in this review, focusing on the limit cycle, which is a model to investigate the entrainment.
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KEYWORD
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Cyclicity, Entrainment, Circadian rhythm, Limit cycle, Free running activity, Phase response curve
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