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
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.
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 ...
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Scientists find clue to mystery of biological clock
Medicine & Health / Neuroscience
21 hours ago |
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How does our biological system know that it is supposed to operate on a 24-hour cycle? Scientists at the Hebrew University of Jerusalem have discovered that a tiny molecule holds the clue to the mystery.
Feeding the clock: Cycles of feeding and fasting drive circadian gene expression in the liver
Nov 25, 2009 |
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When you eat may be just as vital to your health as what you eat, found researchers at the Salk Institute for Biological Studies. Their experiments in mice revealed that the daily waxing and waning of thousands ...
New study describes connections between Circadian and metabolic systems
Nov 12, 2009 |
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A paper by University of Notre Dame biologist Giles Duffield and a team of researchers offers new insights into a gene that plays a key role in modulating the body's Circadian system and may also simultaneously modulate its ...
Research describes connections between Circadian and metabolic systems
Nov 17, 2009 |
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(PhysOrg.com) -- A paper by University of Notre Dame biologist Giles Duffield and a team of researchers offers new insights into a gene that plays a key role in modulating the body’s Circadian system and may ...
Exercise-linked ventricular tachycardia is not a risk to healthy older adults
Nov 17, 2009 |
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Healthy, older adults free of heart disease need not fear that bouts of rapid, irregular heartbeats brought on by vigorous exercise might increase short- or long-term risk of dying or having a heart attack, according to a ...
Java and nighttime jobs don't mix: study
Nov 03, 2009 |
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Night-shift workers should avoid drinking coffee if they wish to improve their sleep, according to research published in the journal Sleep Medicine. A new study led by Julie Carrier, a Université de Montréal psycho ...
Scientists find emotion-like behaviors, regulated by dopamine, in fruit flies
Medicine & Health / Neuroscience
Nov 25, 2009 |
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Scientists at the California Institute of Technology have uncovered evidence of a primitive emotion-like behavior in the fruit fly, Drosophila melanogaster. Their findings, which may be relevant to the relationship betwee ...
Melatonin, a hormone segregated by human body, regulates sleep better than somniferous
Nov 05, 2009 |
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Melatonin, a natural hormone segregated by the own human body, is an excellent sleep regulator expected to replace somniferous, which are much more aggressive, to correct the sleep/wakefulness pace when human biological clock ...
Less than 1 in 3 Toronto bystanders who witness a cardiac arrest try to help: Study
Nov 06, 2009 |
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Researchers at St. Michael's Hospital working in conjunction with EMS services, paramedics and fire services across Ontario found that a bystander who attempts cardiopulmonary resuscitation (CPR) can quadruple the survival ...
Early cooling in cardiac arrest may improve survival
Nov 16, 2009 |
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Rapidly cooling a person in cardiac arrest may improve their chance of survival without brain damage, according to research presented at the American Heart Association's Scientific Sessions 2009.
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