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LOS ANGELES, March 3 (Xinhua) -- More and more American adults are suffering from a decline in overall sleep duration, the U.S. Centers for Disease Control and Prevention (CDC) said on Thursday.It's recommended that adults should sleep seven to nine hours a night to maintain good health, but more than one-third of Americans do not meet that requirement, according to the CDC.Insufficient sleep poses a long-term heath threat and impairs work performance and the ability to drive safely, the CDC said.Chronic sleep loss also is associated with obesity, increased risk of death and other health problems, according to the CDC."Over the last 20 years there has been a decline in overall sleep duration in adults," said Lela McKnight-Eily, a clinical psychologist and epidemiologist at the CDC's National Center for Chronic Disease Prevention."Within our culture there seems to be a belief that sleep isn't a part of overall essential health," she said.McKnight-Eily and her colleagues studied the sleep habits of 74,571 adults in 12 states, 35.3 percent reported sleeping less than seven hours.In addition, 48 percent reported snoring, 37.9 percent said they fell asleep at least once during the day the previous month and 4.7 percent admitted to falling asleep at the wheel at least once.Drowsiness or nodding off while driving accounts for 1,550 deaths and 40,000 injuries a year, according to the U.S. Department of Transportation.To get enough sleep, Americans have to change lifestyle habits, including longer workdays and late nights on the computer, McKnight-Eily said, noting that too much screen time paring away much-needed sleep time.

BEIJING, May 24 (Xinhuanet) -- Scientists revealed for the first time the molecular structure of proteins, which enables bacteria to transfer electrical charges, according to a new study. The revelation was published in Proceedings of the National Academy of Sciences in the U.S. on Monday.Scientists used a technique called "x-ray crystallography" to reveal the molecular structure of proteins, which work as atom-sized "wires" discharging excess electricity."This is an exciting advance in our understanding of how some bacterial species move electrons from the inside to the outside of a cell," said lead author Tom Clarke of the University of East Anglia's School of Biological Sciences in Norwich, England.He said this discovery means "We can now start developing efficient 'bio-batteries' as the viable energy source in the future."Still, it could take perhaps a decade to go. Before that, existing uses of such bacteria needed to become 100 or 1,000 times more efficient, he said.The advance could also hasten the development of microbe technology that can help clean up oil or uranium pollution, he said.Microbes might in future be enlisted to clean up nuclear accidents such as Japan's Fukushima Daiichi disaster, he added.

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, Jan. 21 (Xinhua) -- Chinese Vice Premier Hui Liangyu on Friday urged local governments to step up efforts in protecting agricultural production as winter wheat growing regions in the north of the country have been suffering due to the prolonged drought.Hui warned that the drought could cause great harm to agricultural production.Rainfall in north China, including provinces of Shanxi, Hebei and Shandong, has decreased 20 to 90 percent from the average rain in the same period since October last year.Chinese Vice Premier Hui Liangyu (C) speaks at a meeting on anti-drought and disaster reduction, in Beijing, capital of China, Jan. 21, 2011. Hui Liangyu on Friday urged local governments to step up efforts in protecting agricultural production as winter wheat growing regions in the north of the country have been suffering due to the prolonged drought.Hui urged local departments to improve meteorological monitoring and analysis of the drought, and provide training and services to farmers in order to reduce losses brought about by scarce rain.He also called on local governments to step up construction of more water conservancy projects to better cope with dry weather.Meanwhile, the drought in the north is compared with the intensive icy rain and snow in south and southwest China. A lingering cold spell has been wrecking havoc in these regions, disrupting vegetable production, transportation, and supplies of daily necessities.Hui said the central government would also beef up support in helping these affected regions resume agricultural production as soon as possible.

GENEVA, May 3 (Xinhua) -- Roughly half to three quarters of adults aged between 18 to 65 years have had headache in the last year, a prevalent problem that went under-treated, the Geneva based World Health Organization (WHO) said in a report issued Tuesday.The report, named "Of Headache Disorders and Resources in the World 2011," regarded headache disorders as one of the most prevalent disorders of mankind.WHO estimated over 10 percent of the adult population suffered from migraine, and 1.7 to 4 percent of them were troubled frequently by headache on 15 or more days every month.Among all cases studied, the report said, on average only 10 percent were treated by neurologists, and the rates were even lower in Africa and South-East Asia.Three types of headache disorders were underlined as the most frequently seen, including migraine, tension-type headache and that caused by medication-overuse.The report concluded that given the very high indirect costs of headache, investment in health care related to headache treatment might be overall cost-saving to society.