Light-noise-induced suprathreshold circadian oscillations and coherent resonance in Drosophila.
Based on a reduced circadian oscillator model in Drosophila [Smolen, Biophys. J. 83, 2349 (2002)], the effects of light noise and time delay on a circadian oscillator near a Hopf bifurcation are studied by using numerical computation. When the light-controlled parameter is suprathreshold, it was found that the circadian oscillations can be induced by light fluctuation. There is an optimal light noise intensity at which a remarkable coherent circadian oscillation is observed, which implies a significant resonance phenomenon in the sense of preferred biological circadian oscillations. Time delay can control the coherence of noise-induced circadian oscillations and the strength of coherent resonance achieves a maximum under a moderate time delay.
Yi
Ming
M
Department of Physics, Central China Normal University, Wuhan. yim@phy.ccnu.edu.cn
Jia
Ya
Y
D000818:Animals; D001683:Biological Clocks; D002940:Circadian Rhythm; D003624:Darkness; D004330:Drosophila / Q000502:physiology*; D029721:Drosophila Proteins; D007700:Kinetics; D008027:Light; D008954:Models, Biological; D008962:Models, Theoretical; D009991:Oscillometry / Q000379:methods*; D013997:Time Factors; D014732:Vibration
D029721:Drosophila Proteins