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Description |
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Circadian rhythms are near-24-hour rhythms of biological processes that persist
in the absence of environmental cues such as light and temperature. Such rhythms
have been described in organisms ranging from photosynthetic prokaryotes to
higher eukaryotes and reflect the existence of an underlying intrinsic circadian
oscillator or biological clock. This circadian oscillator may impart an
advantage to the organism by temporally orchestrating physiological and
behavioral processes to better adapt to the predictable daily changes in the
environment. For example, in Cyanobacteria and Arabidopsis, the
circadian oscillator directs transcription of the photosynthetic machinery to
the daylight hours, thereby ensuring efficient assimilation of light energy. In
mammals, circadian consolidation of locomotor activity to time of food
availability and predator avoidance functions to improve [...] |
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References:
1. At the pulse of time: protein interactions determine the pace of circadian clocksSchoning JC, Staiger D.FEBS Lett. 2005 Jun 13;579(15):3246-52. Epub 2005 Mar 242. The circadian timekeeping system of DrosophilaHardin PECurr Biol. 2005 Sep 6; 15(17):R714-22.
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