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WASHINGTON, April 3 (Xinhua) -- In the largest study of its kind, researchers from a consortium led by the University of Pennsylvania School of Medicine, the University of Miami, and the Boston University School of Medicine, identified four new genes linked to Alzheimer's disease. The findings appeared Sunday in the current issue of Nature Genetics.Each gene individually adds to the risk of having this common form of dementia later in life. These new genes offer a portal into what causes Alzheimer's disease and is a major advance in the field.The study, conducted by the Alzheimer's Disease Genetics Consortium, reports genetic analysis of more than 11,000 people with Alzheimer's disease and a nearly equal number of elderly people who have no symptoms of dementia. Three other consortia contributed confirming data from additional people, bringing the total number of people analyzed to over 54,000. The consortium also contributed to the identification of a fifth gene reported by other groups of investigators from the United States, the United Kingdom, France, and other European countries.The study is the result of a large collaborative effort with investigators from 44 universities and research institutions in the United States, led by Gerard Schellenberg at University of Pennsylvania."This is the culmination of years of work on Alzheimer's disease by a large number of scientists, yet it is just the beginning in defining how genes influence memory and intellectual function as we age. We are all tremendously excited by our progress so far, but much remains to be done, both in understanding the genetics and in defining how these genes influence the disease process," Schellenberg said.Until recently, only four genes associated with late-onset Alzheimer's have been confirmed, with the gene for apolipoprotein E-e4, APOE-e4, having the largest effect on risk. The Nature Genetics studies add another four -- MS4A, CD2AP, CD33, and EPHA1 -- and contribute to identifying and confirming two other genes, BIN1 and ABCA7, thereby doubling the number of genes known to contribute Alzheimer's disease.

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.

LIMA, May 5 (Xinhua) -- A total of 53.5 million people in Latin America and the Caribbean suffer from hunger or malnutrition, experts said at an international forum here Thursday.Juan Garcia, coordinator of the 5th work-group meeting of the Latin American and Caribbean Initiative Without Hunger, said the figure has not increased since 1990.Experts and officials from 13 countries gathered to discuss the challenges facing regional food security and advances that have been made, hoping to make cooperative efforts to eradicate hunger and malnutrition by the year 2025.Carcia said people affected most across the continent are still those living in rural areas as well as African descendants and indigenous people who suffer from "exclusion and inequality."The main cause of undernutrition is not lack of food-production capacity, but access to food, Carcia said.Six countries, Brazil, Ecuador, Venezuela, Guatemala, Honduras and Nicaragua, have approved food security laws with nine more in the process of doing so. The laws are considered as a way to ensure that local agricultural products are primarily used to feed the countries' own populations and not used for export.

BEIJING, Feb. 14 (Xinhua) -- Chinese President Hu Jintao met with delegates from the national Party building society here Monday.Vice president Xi Jinping and He Guoqiang, secretary of the Central Commission for Discipline Inspection (CCDI) of the Communist Party of China (CPC), were also present at the occasion in the Great Hall of the People.The delegates were here to attend the fifth national congress of the national Party building society which was established in 1992.Addressing the meeting Monday, Li Yuanchao, head of the Organization Department of the CPC Central Committee, called on all the party building research staff to keep focusing on their study and be innovative in thinking about party building theory so as to strengthen party building in a more scientific way.The society revised its constitution and re-elected members of its council at Monday's meeting.

BEIJING, Feb. 9 (Xinhua) -- China's Ministry of Agriculture on Wednesday urged more measures be taken to minimize the impact of a drought due to the possibility that the winter drought may continue into spring.The country's winter wheat producing regions have suffered severe drought since October last year, and the possibility of spring drought is surfacing, Minister of Agriculture Han Changfu said in a statement posted on the ministry's website.Spring drought following the winter one will be a significant threat to summer grain production, he said.As of Wednesday, the drought had affected about 115.95 million mu (7.73 million hectares) of winter wheat in the country's eight key producing provinces, which account for 42.4 percent of the total winter wheat growing areas in the regions, the statement said.China's main wheat growing regions include the provinces of Shandong, Henan, Hubei, Anhui, Shanxi, Shaanxi, Gansu and Jiangsu.Han urged agricultural authorities to be "fully aware of the extreme significance" of a summer harvest this year and strengthen their efforts to assure a successful harvest.Summer grain and oil production is crucial to easing inflation pressures and stabilizing grain output for the entire year, he said. "To have a summer harvest, the current pressing job is to protect winter wheat from drought," he said.There are currently positive factors for a summer harvest, including an adequacy of water for spring irrigation, according to Han.He ordered local agricultural officials to work to stabilize spring planting areas and ensure that the areas for grain planting will be equal to that of last year.Local agricultural officials were also asked to strengthen supervision over market supplies of agricultural materials to keep prices stable.Also on Wednesday, the State Council, or the nation's cabinet, pledged to boost grain production by raising minimum purchase prices of grain, subsidizing the purchase of anti-drought technologies and adding funding for farm irrigation.

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