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Abstract
In populations of the ciliate protozoan, Paramecium multimicronucleatum, the circadian‐clock‐con‐trolled mating reaction expressed by a limited number of cells among them feeds back to contribute to coherence of their circadian rhythms of motility and mating reaction. This eventually causes a decrease in the period of the rhythms from the entrained 24h period to a steady‐state period of about 22h, with the rate of decrease depending on the strength of the mating reaction. These results suggest that the interaction among oscillators may be one of the factors which modulate the period of a circadian clock composed of nearly identical oscillators. The clock‐controlled mating reaction provides a promising inter‐oscillator pathway for obtaining more insight into the mechanism of modulation of the period of such circadian clocks through inter‐oscillator interaction.
Notes
Departments of ‘Physiology
Departments of Psychiatry
Department of Microbiology, School of Medicine
Faculty of Medical Engineering and Technology, School of Allied Health Science, Kitasato University, Sagamihara, Kanagawa 228, Japan
Graduate School of Information Sciences, Tohoku University, Sendai, 980–77, Japan.
Photodynamics Research Center, IPCR(Riken), Sendai 980, Japan
Biological Laboratory, College of Education, Ibaraki University, Mito, Ibaraki 310, Japan.
Ohu University, Koriyama, Fukushima 963, Japan.
Department of Physics, School of Science and Engineering, Waseda University, Tokyo 169, Japan.
To whom correspondence should be adressed. Phone: 81–427–78–9157, Fax: 81–427–78–8441, E‐mail: B30505@ JPNAC.BITNET.
