circadian rhythm

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Related to Circadian clock: biological clock

circadian rhythm:

see rhythm, biologicalrhythm, biological,
cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the environment.
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circadian rhythm

[sər′kād·ē·ən ′rith·əm]
(physiology)
A self-sustained cycle of physiological changes that occurs over an approximately 24-hour cycle, generally synchronized to light-dark cycles in an organism's environment.
References in periodicals archive ?
The scientists then analyzed the expression of circadian clock genes in tumor cells and in normal (liver) cells from the mice.
But they say it is becoming increasingly clear that body organs and tissues have their own circadian clocks that, when understood, could be used to time drug therapy for maximum benefit.
This is the first study to show that caffeine, the mostly widely used psychoactive drug in the world, has an influence on the human circadian clock," said Wright, a professor in CU-Boulder's Department of Integrative Physiology.
Host circadian clock as a control point in tumor progression.
Other researchers have proposed that because the circadian clock proteins of cyanobacteria, animals and plants are so different, ancestors of those organisms must have evolved clocks independently.
Unusual feeding time may produce chronodisruption, where peripheral circadian clocks of the heart, liver or pancreas become desynchronised from the central clock in the suprachiasmatic nucleus.
The molecular circadian clock consists of transcriptional activators and repressors--that is, proteins that stimulate and repress the production of proteins, respectively, in a cyclic process that is approximately 24-hours in duration (Reppert and Weaver 2002).
Circadian clocks affect cardiovascular system and thought to be responsible for the increased vascular events during certain periods.
Health care providers regularly assess blood and tissue type as well as the size and health of a recovered organ to be transplanted but new research indicates the checklist should also include circadian clock to see if the transplant will be successful.
The effects of different glucose concentrations and different environmental light conditions on the growth of both wild-type and CLAb {an arrhythmic circadian clock mutant) strains were investigated.
It may feel better for the five extra minutes you sleep, but it weakens your internal circadian clock which tells your brain when it should sleep and when it should get up.