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biological clock |
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biological clockRegular internal rhythm of activity, produced by periodic changes in the concentrations of certain molecules, described as circadian rhythms. Such clocks are known to exist in almost all animals, and also in many plants, fungi, and unicellular organisms. In higher organisms, there appears to be a series of clocks of graded importance. For example, although body temperature and activity cycles in human beings are normally ‘set’ to 24 hours, the two cycles may vary independently, showing that two clock mechanisms are involved. The first biological clock gene in plants was isolated in 1995 by a US team of researchers.
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A lot of guys have a biological clock," Scioscia said. Kelton was unable to bear children for medical reasons, and therefore was not under pressure from a biological clock, yet she was searching for the right man to share her life with--most of Don't Use My Sweater Like A Towel recounts the men that she dated, all of whom eventually proved unsuitable for a long-term relationship with her, but many of whom remained good friends after the sex ended. Tokyo, Japan, Aug 23, 2006 - (JCN) - Tohoku University in collaboration with Vanderbilt University annouonced on August 22 the results of a study on how the effect of light environment can disrupt the brain activities of infants and is found to be the cause of the unusual biological clock, sleep-wake cycle in their developmental process. |
biological clock
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