Related topics: circadian clock , biological clock
Circadian rhythm
hideA circadian rhythm is a roughly-24-hour cycle in the biochemical, physiological or behavioral processes of living entities, including plants, animals, fungi and cyanobacteria (see bacterial circadian rhythms). The term "circadian", coined by Franz Halberg, comes from the Latin circa, "around," and diem or dies, "day", meaning literally "approximately one day." The formal study of biological temporal rhythms such as daily, tidal, weekly, seasonal, and annual rhythms, is called chronobiology.
Circadian rhythms are endogenously generated, and can be entrained by external cues, called Zeitgebers, the primary one of which is daylight. These rhythms allow organisms to anticipate and prepare for precise and regular environmental changes.
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News tagged with circadian rhythms
Appetite, consumption controlled by clockwork genes at cross-purposes in flies
Dec 06, 2009 |
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One of the pioneers in research on sleep:wake circadian genes, Amita Sehgal, Ph.D., has discovered that fruit flies' appetite and consumption are controlled by two rival sets of clocks, one in neurons and the other in the ...
Faulty body clock may make kids bipolar
Medicine & Health / Psychology & Psychiatry
Nov 12, 2009 |
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Malfunctioning circadian clock genes may be responsible for bipolar disorder in children. Researchers writing in the open access journal BMC Psychiatry found four versions of the regulatory gene RORB that were associated with p ...
Not just bleach: Hydrogen peroxide may tell time for living cells
Nov 03, 2009 |
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If a circadian rhythm is like an orchestra - the united expression of the rhythms of millions of cells - a common chemical may serve as the conductor, or at least as the baton.
Researchers find new mechanism for circadian rhythm
Oct 20, 2009 |
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Molecules that may hold the key to new ways to fight cancer and other diseases have been found to play an important role in regulating circadian rhythm, says Liheng Shi, a researcher in Texas A&M's Department of Veterinary ...
The food-energy cellular connection revealed
Oct 15, 2009 |
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Our body's activity levels fall and rise to the beat of our internal drums—the 24-hour cycles that govern fundamental physiological functions, from sleeping and feeding patterns to the energy available to our cells. Whereas ...
New pattern in our biological clock overturns long-held theory
Oct 08, 2009 |
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(PhysOrg.com) -- University of Michigan mathematicians and their British colleagues say they have identified the signal that the brain sends to the rest of the body to control biological rhythms, a finding that overturns ...
Chemotherapy for breast cancer is associated with disruption of sleep-wake rhythm in women
Sep 01, 2009 |
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A study in the Sept.1 issue of the journal Sleep shows that the sleep-wake activity rhythms of breast cancer patients are impaired during the administration of chemotherapy. Results indicate that the first cycle of chemot ...
How alcohol blunts the ability of hamsters to 'rise and shine'
Sep 01, 2009 |
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Chronic alcohol consumption blunts the biological clock's ability to synchronize daily activities to light, disrupts natural activity patterns and continues to affect the body's clock (circadian rhythm), even days after the ...
First human gene implicated in regulating length of human sleep
Aug 13, 2009 |
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Scientists have discovered the first gene involved in regulating the optimal length of human sleep, offering a window into a key aspect of slumber, an enigmatic phenomenon that is critical to human physical and mental health.
Biological clocks of insects could lead to more effective pest control
Aug 12, 2009 |
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Researchers at Oregon State University have discovered that the circadian rhythms or biological "clocks" in some insects can make them far more susceptible to pesticides at some times of the day instead of ...
Clocking salt levels in the blood: A link between the circadian rhythm and salt balance
Jul 01, 2009 |
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New research, conducted by Charles Wingo and his colleagues, at the University of Florida, Gainsville, suggests a link between the circadian rhythm and control of sodium (salt) levels in mice.
Research reveals how cells tell time
Jun 08, 2009 |
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The fuzzy pale mold that lines the glass tubes in Dr. Yi Liu's lab doesn't look much like a clock. But this fungus has an internal, cell-based timekeeper nearly as sophisticated as a human's, allowing UT Southwestern Medical ...
The clock watcher: Circadian rhythms research is shedding light on the causes of disease and aging
May 29, 2009 |
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(PhysOrg.com) -- Embedded in our genes is a "clock" that regulates when we sleep, when we are awake and when we eat. This human clock manages what are known as circadian rhythms, 24-hour biological cycles ...
Researchers develop light-treatment device to improve sleep quality in the elderly
May 29, 2009 |
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Sleep disturbances increase as we age. Some studies report more than half of seniors 65 years of age or older suffer from chronic sleep disturbances. Researchers have long believed that the sleep disturbances ...
Study reveals new data on circadian rhythms
May 07, 2009 |
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Fluctuations in light intensity allow restoring the regularity of circadian rhythms. This is the main conclusion of the work carried out by Javier Buceta, group leader of The SiMBioSys Group (Theoretical and In Silico Modelling ...
