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Last updated on April 24, 2014 at 21:24 EDT

Latest period Stories

2010-12-02 00:45:37

A gene that controls part of the 'tick tock' in a plant's circadian clock has been identified by UC Davis researchers. And not only is the plant gene very similar to one in humans, but the human gene can work in plant cells -- and vice versa. The research is published this week in the journal Proceedings of the National Academy of Sciences. "It's surprising to find a clock gene that is performing the same function across such widely unrelated groups," said Stacey Harmer, associate professor...

2010-11-16 12:50:13

UCI study opens new avenue for obesity and diabetes drug development UC Irvine researchers have discovered that circadian rhythms "” the internal body clock "” regulate fat metabolism. This helps explain why people burn fat more efficiently at certain times of day and could lead to new pharmaceuticals for obesity, diabetes and energy-related illnesses. The study was headed by Paolo Sassone-Corsi, Donald Bren Professor and chair of pharmacology. A leading expert on circadian...

2010-11-12 12:34:50

Researchers in France have uncovered a mechanism which explains how biological clocks accurately synchronize to the day/night cycle despite large fluctuations in light intensity during the day and from day to day. Following the identification of two central "clock genes" of a green alga, Ostreococcus tauri, a mathematical model reproducing their daily activity profiles has revealed that their internal clock is influenced by the naturally varying light levels throughout the day only at periods...

2010-10-20 19:01:57

Concordia research looks at role of dopamine in the rhythms of daily behavior; may have impact on activity and sleep rhythms in Parkinson's disease Daily sleeping and eating patterns are critical to human well-being and health. Now, a new study from Concordia University has demonstrated how the brain chemical dopamine regulates these cycles by altering the activity of the "clock-protein" PER2. Published in the Journal of Neuroscience, these findings may have implications for individuals with...

2010-08-25 01:55:06

    * Circadian clock genes are key to regulating physiological and behavioral activities.    * Animal studies have shown that chronic drinking can disrupt expression in these genes.    * A human study has found an association between dysregulation of circadian clock genes and chronic drinking. Circadian rhythmicity is regulated by circadian clock genes, and animal studies have shown that chronic drinking can alter expressions in these genes. A new...

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2010-03-19 10:26:03

Cell division in cyanobacteria controlled by same kind of circadian rhythms that govern human sleep A team of researchers at MIT and the University of California at San Diego has shown how cell division in a type of bacteria known as cyanobacteria is controlled by the same kind of circadian rhythms that govern human sleep patterns. Previous studies have shown that even though cyanobacteria do not "sleep" in the same way that humans do, they cycle through active and resting periods on a...

2009-12-06 13:47:57

New research extends circadian clock repertoire into metabolism 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 fly fat body, which is analogous to the liver. These research results, which extend the circadian clock repertoire into metabolism, will be reported at the American Society for Cell Biology (ASCB) 49th Annual...

2009-11-30 16:05:21

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. Human as well as most living organisms on earth possess circadian a (24-hour) life rhythm. This rhythm is generated from an internal clock that is located in the brain and regulates many bodily functions, including the sleep-wake cycle and eating. Although the evidence for their existence is...

2009-11-25 10:03:18

Cycles of feeding and fasting drive circadian gene expression in the liver 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 of genes in the liver"”the body's metabolic clearinghouse"”is mostly controlled by food intake and not by the body's circadian clock as conventional wisdom had it. "If feeding time determines the...

2009-11-12 22:36:24

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 metabolic system. The relationship between circadian and metabolic systems the researchers describe could have important implications for understanding the higher incidence of cardiovascular disease, obesity and diabetes among shift workers. The master circadian clock in...