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cje ›› 1998, Vol. ›› Issue (6): 40-43.

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Circadian Generator of Rodents and its Photoperiod Regulation

Cai Liquan, Li Qingfen   

  1. Department of Biology, Beijing Normal University 100875
  • Received:1996-08-15 Revised:1996-10-17 Online:1998-12-10

Abstract: Circadian rhythm is a general phenomenon in rodents, and it is a evolutionary result from animals' environmental adaptation.The SCN(suprachiasmatic neucleus)is believed to be an oscillator in mammals. It has the ability of both generating endogenerous periodicity and synchronising the environmental factors. Gene experession of some IEGs(Immeadiate early qenes)in the SCN, e.g. c-fos, jun-B, is effected by photoperiod. Their experssion product, Fos-Jun, can regulate some clock genes' expression. Thus, photoperiod can influent on circadian rhythm by speficially regulating genes' expression.

Key words: Cleistogenes squarrosa, restorative succession, point pattern, complete spatial randomness model, Poisson cluster process, nested double-cluster process.