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Period Responses to Zeitgeber Signals Stabilize Circadian Clocks During Entrainment

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dc.contributor.author Sharma, Vijay Kumar
dc.date.accessioned 2012-01-24T09:46:23Z
dc.date.available 2012-01-24T09:46:23Z
dc.date.issued 2003
dc.identifier 0742-0528 en_US
dc.identifier.citation Chronobiology International 20(3), 389-404 (2003) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/246
dc.description Restricted Access en_US
dc.description.abstract Circadian clocks with characteristic period (tau) can be entrained to light/dark (LD) cycles by means of (i) phase shifts which are due to D/L "dawn" and/or L/D "dusk" transitions, (ii) period changes associated with long-term light exposure, or (iii) by combinations of the above possibilities. Based on stability analysis of a model circadian clock it was predicted that nocturnal burrowing mammals would benefit less from period responses than their diurnal counterparts. The model further predicted that maximal stability of circadian clock is reached when the clock slightly changes both its phase and period in response to light stimuli. Analyses of empirical phase response curve (PRC) and period response curve (tauRC) of some diurnal and nocturnal mammals revealed that PRCs of both diurnal and nocturnal mammals have similar waveform while tauRCs of nocturnal mammals are of smaller amplitude than those of diurnal mammals. The shape of the tauRC also changes with age and with increasing strength of light-stimuli. During erratic fluctuations in light intensity under different weather conditions, the stability of phase of entrainment of circadian clocks appears to be achieved by an interplay between phase and period responses and the strength of light stimuli. en_US
dc.description.uri http://dx.doi.org/10.1081/CBI-120020422 en_US
dc.language.iso en en_US
dc.publisher Marcel Dekker Inc en_US
dc.rights © 2003 Marcel Dekker Inc en_US
dc.subject PRC en_US
dc.subject TRC en_US
dc.subject transient en_US
dc.subject nonparametric en_US
dc.subject parametric en_US
dc.subject entrainment en_US
dc.subject Mouse Mus-Booduga en_US
dc.subject Locomotor-Activity Rhythm en_US
dc.subject Light-Induced Phase en_US
dc.subject Skeleton Photoperiodic Regimes en_US
dc.subject Casein Kinase-I en_US
dc.subject Nocturnal Rodents en_US
dc.subject Suprachiasmatic Nucleus en_US
dc.subject Creb Phosphorylation en_US
dc.subject Natural Entrainment en_US
dc.subject Functional-Analysis en_US
dc.title Period Responses to Zeitgeber Signals Stabilize Circadian Clocks During Entrainment en_US
dc.type Article en_US


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