News tagged with circadian rhythms

Examining evolution from a cellular perspective

The evolutionary processes of unicellular and multicellular organisms are continually under debate. John Torday, Ph.D., a lead investigator at Los Angeles Biomedical Research Institute (LA BioMed), has recently co-authored ...

Biology / Evolution

created Jan 25, 2012 | popularity 5 / 5 (1) | comments 0

Researchers identify structure of circadian clock protein

(PhysOrg.com) -- Feeling jet-lagged? You may need your internal clock reset. New Cornell research has taken a major step toward treating jet lag and other more serious syndromes by advancing our understanding ...

Biology / Cell & Microbiology

created Nov 15, 2011 | popularity 5 / 5 (3) | comments 1 | with audio podcast

Research team shows skin stem cells run by circadian clock

(PhysOrg.com) -- Most everyone has heard of the circadian rhythm or the internal clock that people have that tells them when to do things, such as go to sleep. In fact, researchers have actually located where this “clock” ...

Biology / Cell & Microbiology

created Nov 10, 2011 | popularity 5 / 5 (3) | comments 0 | with audio podcast report

Glowing, blinking bacteria reveal how cells synchronize biological clocks

Biologists have long known that organisms from bacteria to humans use the 24 hour cycle of light and darkness to set their biological clocks. But exactly how these clocks are synchronized at the molecular level to perform ...

Biology / Cell & Microbiology

created Sep 01, 2011 | popularity not rated yet | comments 0 | with audio podcast

Finding mechanism behind bacteria's biological clock

(PhysOrg.com) -- A discovery by a professor at the University of California, Merced, is providing a deeper understanding of the factors that control biological clocks.

Biology / Cell & Microbiology

created Aug 31, 2011 | popularity not rated yet | comments 0 | with audio podcast

Repairing our inner clock with a two-inch fish

Circadian rhythms — the natural cycle that dictates our biological processes over a 24-hour day — does more than tell us when to sleep or wake. Disruptions in the cycle are also associated with depression, problems ...

Biology / Biotechnology

created Jul 21, 2011 | popularity 5 / 5 (1) | comments 0

Biologists discover an 'evening' protein complex that regulates plant growth

Farmers and other astute observers of nature have long known that crops like corn and sorghum grow taller at night. But the biochemical mechanisms that control this nightly stem elongation, common to most plants, have been ...

Biology / Biotechnology

created Jul 13, 2011 | popularity 4.3 / 5 (3) | comments 0 | with audio podcast

'Wrong'-time eating reduces fertility in fruit flies

Dieticians will tell you it isn't healthy to eat late at night: it's a recipe for weight gain. In fruit flies, at least, there's another consequence: reduced fertility.

Biology / Cell & Microbiology

created Jun 07, 2011 | popularity not rated yet | comments 1

Video gaming teens sleep less: study

Teens who play a lot of video games are likely to sleep less than the eight to nine hours a night recommended for the age group, researchers said Monday.

Medicine & Health / Health

created May 16, 2011 | popularity not rated yet | comments 1

Experimental work proves theory that circadian body clock requires delay to function properly

For more than 20 years, theoretical mathematical models have predicted that a delay built into a negative feedback system is at the heart of the molecular mechanism that governs circadian clocks in mammalian ...

Biology / Cell & Microbiology

created Mar 25, 2011 | popularity 4 / 5 (1) | comments 0

'Round-the-clock' lifestyle can disrupt metabolism, brain and behavior

(PhysOrg.com) -- In Civilization and Its Discontents, Sigmund Freud argued that modern society was hard on human psychology, forcing people to get along in unnaturally close quarters. Now newly published resear ...

Medicine & Health / Medical research

created Feb 21, 2011 | popularity 4.6 / 5 (13) | comments 4 | with audio podcast

SAD affects many through winter months

For many, the changing of the seasons means cozy dark evenings of winter and enjoying holiday light displays. But perhaps for you, the shortening of the days signals a time when you feel down, sad or withdrawn. You may notice ...

Medicine & Health / Psychology & Psychiatry

created Feb 18, 2011 | popularity not rated yet | comments 0

Analysis of bread mold genomes demos 'reverse-ecology' tool

In a demonstration of "reverse-ecology," biologists at the University of California, Berkeley, have shown that one can determine an organism's adaptive traits by looking first at its genome and checking for ...

Biology / Biotechnology

created Jan 31, 2011 | popularity 5 / 5 (1) | comments 0 | with audio podcast

Researchers apply fatigue model to fatal commuter air crash

Washington State University sleep researchers have determined that the air traffic controller in the crash of a Lexington, Ky., commuter flight was substantially fatigued when he failed to detect that the plane was on the ...

Other Sciences / Social Sciences

created Jan 20, 2011 | popularity not rated yet | comments 0

Corals and humans have much in common, researchers find

(PhysOrg.com) -- An international team of Australian and Israeli coral geneticists, including scientists from University of Queensland, has found that corals, among the simplest of Earth's creatures, have some curiously human-like ...

Biology / Biotechnology

created Jan 20, 2011 | popularity 5 / 5 (3) | comments 1 | with audio podcast

Circadian rhythm

A 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.

For more information about Circadian rhythm, read the full article at Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.

Related topics: sleep