circadian rhythm

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circadian rhythm:

see rhythm, biologicalrhythm, biological,
or biorhythm,
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Interestingly, a population of approximately 50 neurons is required before a differentiable photoperiodic profile emerges.
This is supported by our previous ex vivo study on ovine pineal glands explants [12] and in vivo study on sheep conducted in two different photoperiodic conditions [13] showed that IL-1[beta] is the potent down-regulator of melatonin secretion.
All transcript contigs from photoperiodic and tidal conditions were also annotated using the BLAST2GO pipeline, which uses gene ontology (GO) to define genes based on common functions and relationships.
Li et al., "Association of the circadian rhythmic expression of GmCRY1a with a latitudinal cline in photoperiodic flowering of soybean," Proceedings of the National Academy of Sciences of the United States of America, vol.
Photoperiodic regulation of body mass, food intake and reproduction in meadow voles.
A world-wide, north-south pattern of clinal (geographically-graduated and genetically fixed) photoperiodic adaptation correlated with stature has evolved in Cannabis.
to be antigonadotropic, in photoperiodic animals since prolonged elevation of nocturnal levels of serum melatonin presumably suppressed the hypothalamic-pituitary-gonadal axis resulting in the involution of the reproductive organs in these animals (Reiter, 1973).
A photoperiodic response in gonadectomized Japanese quail exposed to a single long day.
Explants of different age were cultured on Murashige and Skoog (MS) medium containing auxins and cytokinins in elite leafy vegetables under different photoperiodic conditions to explore in vitro regeneration.
Melatonin is suspected to be a phylogenetically ubiquitous molecule, mainly involved in the transduction of photoperiodic information for the regulation of the circadian system (Reiter, 1993; Hardeland, 1999).