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LOS ANGELES, March 2 (Xinhua) -- Those who take a nap are more likely to have lower levels of blood pressure despite stress, said a new study in the latest issue of International Journal of Behavioral Medicine available on Wednesday.In the study, researchers at Sarah Conklin of Allegheny College in Meadville, Pennsylvania examined 85 healthy university students, who were divided into two groups, with one group taking an hour- long nap during the day, and the other group having no time to sleep. Both groups were given a mental stress test.The study found that participants in both groups experienced increase in blood pressure and pulse rates when they took the stress test, but the average blood pressure of those who slept for at least 45 minutes was significantly lower after the stress test than it was for those who did not sleep.The researchers drew the conclusion that a daytime nap of at least 45 minutes may help stressed-out people lower their blood pressure and protect their heart."Our findings suggest that daytime sleep may offer cardiovascular benefit by accelerating cardiovascular recovery following mental stressors," the researchers said in the study."Further research is needed to explore the mechanism by which daytime sleep is linked with cardiovascular health and to evaluate daytime sleep as a recuperative and protective practice, especially for individuals with known cardiovascular disease risk and those with suboptimal sleep quality," they added.Sleep deficiency is common in the United States, posing a long- term health threat. On average, Americans get nearly two hours less sleep a night than they did 50 years ago, according to background information provided by the journal.

SAN FRANCISCO, March 29 (Xinhua) -- Computer networking equipment giant Cisco Systems Inc. on Tuesday announced the intent to buy privately-held software company newScale Inc., in a move to complement and expand its offerings in cloud computing.Based in San Mateo in the U.S. state of California, newScale provides software that delivers a service catalog and self-service portal for information technology (IT) organizations to select and quickly deploy cloud services within their businesses.Founded in 1999, the company now has more than two million users worldwide, including 20 percent of the Fortune 50 companies, according to information posted on newScale's website."With the acquisition of newScale, Cisco will be able to accelerate the deployment of cloud services through a service catalog and self-service portal that allows customers to easily manage their IT infrastructures," Parvesh Sethi, Cisco's senior vice president, noted in a statement.Cisco said it expects to close the deal in the second half of its fiscal year 2011, without disclosing financial terms.

WASHINGTON, April 4 (Xinhua) -- Scientists have identified a gene that appears to play a role in regulating how much alcohol people drink, in a study of over 47,000 people published Monday in the Proceedings of the National Academy of Sciences.The researchers say that finding a common genetic variation influencing levels of alcohol consumption may lead to a better understanding of mechanisms underlying alcohol drinking behavior in the general population.The gene, called "autism susceptibility candidate 2", or AUTS2, has previously been linked to autism and attention deficit hyperactivity disorder, but its function is not known.The new study, by an international consortium led by scientists at Imperial College London and King's College London, found that there are two versions of the AUTS2 gene, one three times more common than the other. People with the less common version drink on average five percent less alcohol than people with the more common version.The gene is most active in parts of the brain associated with neuropsychological reward mechanisms, suggesting that it might play a part in regulating the positive reinforcement that people feel when they drink alcohol.Alcohol consumption is known to be partly determined by genes but until now the only gene known to make a notable contribution was the gene encoding alcohol dehydrogenase, an enzyme that breaks down alcohol in the liver.Professor Paul Elliott, from the School of Public Health at Imperial College London, said: "Of course there are a lot of factors that affect how much alcohol a person drinks, but we know from twin studies that genes play an important role. The difference that this particular gene makes is only small, but by finding it we've opened up a new area of research into the biological mechanisms that control drinking."

ZHENGZHOU, Feb. 16 (Xinhua) -- China's Yellow River catchment authority has launched emergency measures to restrict industrial water usage and to release reservoir water for wheat crops in the face of a worsening drought.The Yellow River Flood Control and Drought Relief Headquarters raised on Wednesday its drought alert from yellow to orange, the second-highest level, indicating the area is facing the worst drought in up to half a century.The headquarters ordered all authorities along the catchment area to initiate an emergency response to ensure water supplies for people and livestock, and to restrict industrial water consumption.The drought, which has plagued the middle and lower reaches of the Yellow River since October last year, was likely to affect more than 40 percent of crops in the area, said a headquarters spokesman.Light to moderate snowfall brought some relief to the wheat farmers in the region over the weekend, but not enough to end the drought. Most regions along the Yellow River received precipitation of less than 10 mm.Thanks to the recent rise in temperatures, ice covering 120-km of the Yellow river has melted, offering more water for irrigation and other water uses.The headquarters' statistics show that water channeled from the Yellow River reached 228 cubic meters per second at 8 a.m. Tuesday, and supplied the drought-plagued Shandong Province, Tianjin Municipality and Hebei Province.The headquarters had released more water from reservoirs along the catchment to help with the irrigation of winter wheat crops, said the spokesman.The Chinese government on Friday announced plans to dig 1,350 wells in eight major wheat-growing provinces to help ease the drought that is threatening grain harvests.

BEIJING, May 24 (Xinhuanet) -- CT scan, a widely used heart-imaging test, is likely to result in the over treatment for patients with heart disease, according to a study published online by the Archives of Internal Medicine on Monday.CT, which produces a detailed image of the heart that reveals cholesterol buildups in the coronary arteries, is widely used in the hospital around the world."Testing might lead to more harm than good," said McEvoy, a doctor at Seoul National University Bundang Hospital in S. Korea.His team led the study, in which 2,000 healthy adults were divided into two groups. One thousand adults had CT scans and another half had standard tests, including routine checks of their blood pressure and cholesterol levels.After 18 months, the 215 people who had worrisome CT scans were advised to have additional tests and medical treatment, and some even advised to have surgery. But less than 10 percent in the group of standard test were reported to need medications.Therefore, physicians cannot easily ignore the diagnoses made by the new imaging techniques, McEvoy said, "We are left with the dilemma of what to do with the results,"According to McEvoy, doctors should focus on patients' lifestyle and traditional risk factors such as smoking and obesity.