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Tag: "rhythm" at biology news

Identified main genetic variants involved in response to HIV

...rst two years after the infection, and also to the rhythm of immune degradation as a result of the infection. This type of comparison, known as association study, permitted to deduct main genetic variations playing a central role in the control of viral infection. Results point to two gene variants relate...

Research finds that circadian rhythms dominate all life functions

...behavior of the living, the study shows that daily rhythm dominates all life functions and particularly meta...fused with the lack of oscillation. This makes the rhythm much harder to detect. "It's like a conductor walking away from an orchestra during a performance;...

Sleepless for science: Flies show link between sleep, immune system in Stanford study

... will be testing mutant flies with other circadian rhythm genes missing. They hope their work inspires researchers who work on vertebrates to explore the molecular underpinnings of the interaction between sleep and immunity. "The cool thing is that many of the clock genes are conserved between flies ...

Implanting dopamine generators in brain cells obtains improvement in Parkinson's in monkeys

... level of the neck. Its function is to control the rhythm of respiration and the cardiac frequency through releasing dopamine in situations of low oxygen level in the blood. After the implantation of the cellular aggregates of the carotid body into the striate area of the brain, the improvement in movement ...

To sleep, perchance to dream: New insight into melatonin production

...ain, which helps to regulate our bodies' circadian rhythm (the roughly-24-hour cycle around which basic physiological processes proceed). Normally, melatonin production is inhibited by light and enhanced by darkness, usually peaking in the middle of the night. Melatonin's expression pattern is mimicked by ...

Are one-third of costly implanted heart devices unnecessary? New study suggests yes

...ces are designed to shock damaged hearts back into rhythm and save patients from sudden cardiac death, which... devices based on criteria relating to their heart rhythm and pumping capability. But if every Medicare participant who qualified for an ICD under current gui...

Surgeons develop simpler way to cure atrial fibrillation

...ting atrial fibrillation, a common irregular heart rhythm that can cause stroke. Heart surgeons at Washingto...nsible for atrial fibrillation, an irregular heart rhythm in which the upper heart chambers or atria wriggle like a bag of worms. The Cox-maze procedure wa...

Gene that makes people 'early to bed and early to rise' demystified

...nfluencing people's so-called circadian, or daily, rhythm might lead to therapies that could adjust the body's clock in those suffering from conditions including jet lag or shift work sleep disorder, according to the researchers. "This study highlights the power of natural human mutations to uncover thing...

Slow brain waves play key role in coordinating complex activity

...om-up sensory or motor processing, while the theta rhythm is much more spatially widespread, the size of a s...u'll have an increase in the strength of the theta rhythm in many different brain regions," Canolty said. "The idea is that this theta rhythm might be more of...

Cardiologist's 'living chip' changes science of disease monitoring

...ist Spencer Rosero, M.D., who specializes in heart rhythm disorders. The company is developing implantable biosensors ?integrating living cells with electronics ?to create a "biological chip." When implanted, this chip can detect physiologic and chemical changes with faster, improved accuracy. These more ac...

Melatonin improves mood in winter depression

...gnized pioneer in the study of circadian (24-hour) rhythm disturbances, such as those found in air travelers and shift workers, as well as in totally blind people. Lewy and his colleagues in the OHSU Sleep and Mood Disorders Lab set out to test the hypothesis that circadian physiological rhythms become mis...

Master planners in brain may coordinate other areas' roles in cognitive tasks

...ty of cognitive tasks, such as reading, learning a rhythm or analyzing a picture. If the brain in action can be compared to a symphony, with specialized sections required to pitch in at the right time to produce the desired melody, then the regions highlighted by the new study may be likened to conductors,...

Clot-busting drug helps revive cardiac arrest patients

...age of an artery in the lungs that can cause heart rhythm problems). Clot-busting drugs aren't typically used in patients with cardiac arrest because of concerns that the chest compressions used during CPR could cause bleeding complications. Several small studies, however, have suggested that clot-busting ...

Researchers link two more genes to sudden infant death syndrome

...hannel genes that cause a potentially lethal heart rhythm syndrome known as long QT syndrome (LQTS) was foun...use of its involvement in a distinct genetic heart rhythm disease known as catecholaminergic polymorphic ventricular tachycardia (CPVT). "For a parent whose ...

Septum keeps neurons in synch, can reduce epileptic seizures by 90 percent

...searchers found that, by imposing a normal "theta" rhythm on chronically epileptic rats, they could reduce e...tic rats: Potential antiepileptic effects of theta rhythm generation," by Luis V. Colom, Antonio García-Hernández, Maria T. Castañeda, Miriam G. Perez-Cordova...

Toxic molecule may cause most common type of muscular dystrophy

... including an inability to relax muscles and heart rhythm abnormalities. When doxycycline was stopped, mice stopped producing toxic RNA and returned to normal, except in cases when the heart was severely damaged. So far, however, Mahadevan and other scientists can't explain exactly what happens inside th...

New fruit fly protein illuminates circadian response to light

...ism. Although circadian function produces a stable rhythm in the body, the biological clock will reset in re...st recent issue of Science. To test the circadian rhythm of fruit flies, Sehgal and others exposed wild type (control) and mutant flies to several light and ...

Possible brain hormone may unlock mystery of hibernation

... controlled by an individual's internal circannual rhythm even under conditions of constant cold. In 20 hibernators examined throughout their lives, concentrations of HPc in the blood started to decrease prior to hibernation and remained low throughout the inactive state. Hibernation ended after blood HPc l...

Engineered heart tissue offers insights into irregular heartbeats, defibrillator failure

...ias and are therefore at increased risk for future rhythm abnormalities, Bursac said. In patients with implanted defibrillators, the devices often attempt to terminate ventricular tachycardia by delivering electrical pulses to a single site at a rate slightly higher than the rate of tachycardia. Such pacin...

Gene variation increases SIDS risk in African Americans

...s an infant's risk of developing an abnormal heart rhythm during times of environmental stress, a research team based at the University of Chicago reports in the February 2006 issue of the Journal of Clinical Investigation. Children with two copies of the common genetic variation have a 24-fold increased ...

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