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BEIJING, Feb. 5 (Xinhua) -- China's meteorological authority said Saturday that a cold snap would sweep north China over the next few days, bringing down temperatures and carrying gusty winds.Temperatures in some parts of Xinjiang Uygur Autonomous Region, Inner Mongolia Autonomous Region and northeast China will drop 4 to 6 degrees Celsius over the weekend, the National Meteorological Center (NMC) said in a statement on its website.In most areas north to the Huaihe River, the temperatures will go down 4 to 6 degrees Celsius, or even 8 to 10 degrees Celsius in some parts of the areas between Monday and Tuesday.The cold front would then move southward to affect more areas in the eastern and southern parts of the country.The NMC said some areas in northern and western Xinjiang Uygur Autonomous Region, the eastern part of Inner Mongolia, Sichuan Basin and most of the northeast China, the western parts of the areas south to the Yangtze River will see light to moderate snow or sleet in the forthcoming three days.Fog continued to shroud south China Saturday, reducing visibility to less than 200 meters in parts of Hunan, Hubei, Jiangxi, Sichuan and Fujian provinces, as well as Chongqing City.

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.

LOS ANGELES, April 2 (Xinhua) -- People taking antidepressants may be more likely to develop thicker arteries which may raise the risk of heart disease and stroke, a new study suggests.Depression can heighten the risk for heart disease, but the effect of antidepressant use is separate and independent from depression itself, according to the study make public by the American Association for the Advancement of Science (AAAS) on Saturday.The data suggest that antidepressants may combine with depression for a negative effect on blood vessels, said study first author Amit Shah, MD, a cardiology fellow at Emory University School of Medicine.Study findings will be presented on April 5 at the American College of Cardiology meeting in New Orleans, according to the AAAS.The study included 513 middle-aged male twins who both served in the U.S. military during the Vietnam War. Twins are genetically the same but may be different when it comes to other risk factors such as diet, smoking and exercise, so studying them is a good way to distill out the effects of genetics.Researchers measured carotid intima-media thickness - the thickness of the lining of the main arteries in the neck -- by ultrasound. Among the 59 pairs of twins where only one brother took antidepressants, the one taking the drugs tended to have higher carotid intima-media thickness (IMT), even when standard heart disease risk factors were taken into account.The effect was seen both in twins with or without a previous heart attack or stroke. A higher level of depressive symptoms was associated with higher IMT only in those taking antidepressants."One of the strongest and best-studied factors that thickens someone's arteries is age, and that happens at around 10 microns per year," Shah said. "In our study, users of antidepressants see an average 40 micron increase in IMT, so their carotid arteries are in effect four years older."Antidepressants' effects on blood vessels may come from changes in serotonin, a chemical that helps some brain cells communicate but also functions outside the brain, Shah said."I think we have to keep an open mind about the effects of antidepressants on neurochemicals like serotonin in places outside the brain, such as the vasculature. The body often compensates over time for drugs' immediate effects," Shah said. " Antidepressants have a clinical benefit that has been established, so nobody taking these medications should stop based only on these results. This isn 't the kind of study where we can know cause and effect, let alone mechanism, and we need to see whether this holds up in other population groups."

JOHANNESBURG, March 8 (Xinhua) -- In order to combat piracy and to improve maritime safety, South African authorities have begun using a sophisticated navigation satellite system, it was announced on Tuesday.Piracy, especially by Somalis, has been increasing along Africa east coast in recent years. The South African Press Association (SAPA) reported on Tuesday that Karl Otto, head of the South African Maritime Safety Authority (SAMSA) announced the surveillance tool at a conference in Durban.Called Long Range Identification and Tracking (LRIT), the system monitors and tracks vessels in waters south of the equator.Otto said the introduction of the LRIT followed concerns over the safety of seafarers, the safety standards of ships within South African waters.Otto said there were high levels of cargo at risk, such as fuels and oils.He said reasons for installing the system included the number of shipwrecks along the South African coast, and the threat of pollution of the marine environment by ships."It also serves as a mechanism to prevent piracy."Otto said the satellite system has the capacity to identify and track vessels up to 1,000 nautical miles (1,850 km) from the South African coastline as well as South African-flagged vessels anywhere in the world."This is a revolutionary development in the security of our seas," he said.SAMSA was determined to protect South Africa's seafarers, its coastline and the marine environment, Otto said.

CHICAGO, Jan. 21 (Xinhua) -- Chinese President Hu Jintao left Chicago for home on Friday after concluding a four-day state visit to the United States, during which Hu and his U.S. counterpart Barack Obama agreed to build a China-U.S. cooperative partnership based on mutual respect and mutual benefit.President Hu, who began his visit on Tuesday, had extensive and in-depth discussions with Obama at the White House on Wednesday on major bilateral, regional and world issues.The two sides reached "important agreement on China-U.S. relations and major international and regional issues of shared interest," the Chinese president said when he and Obama met the press following their discussions."We both agree to further push forward the positive, cooperative and comprehensive China-U.S. relationship," Hu said, adding that both sides also pledged to forge "a China-U.S. cooperative partnership based on mutual respect and mutual benefit" for the benefit of the two countries and beyond.The Chinese president said he and Obama also discussed some disagreements in the economic and trade area, with both sides pledging "to continue to appropriately resolve these according to the principle of mutual respect and consultation on an equal footing."Also on Wednesday, Hu attended a state dinner and a welcome ceremony hosted by Obama.Hu told the Americans on several occasions in Washington that the purpose of his visit to the United States was "to increase mutual trust, enhance friendship, deepen cooperation and advance the positive, cooperative and comprehensive China-U.S. relationship for the 21st century."During Hu's visit, the two countries issued the "China-U.S. Joint Statement," which says "China and the United States committed to work together to build a cooperative partnership based on mutual respect and mutual benefit in order to promote the common interests of both countries and to address the 21st century's opportunities and challenges.""China and the United States are actively cooperating on a wide range of security, economic, social, energy, and environmental issues which require deeper bilateral engagement and coordination," the statement said.On Thursday, Hu called upon the U.S. Congress to continue helping the two countries boost their relations.Pursuing a healthy and steady development of China-U.S. ties is China's established policy and strategic choice, Hu stressed when meeting House Speaker John Boehner and Senate Majority Leader Harry Reid.Also on Thursday in Washington, Hu delivered an important speech at the welcome luncheon hosted by friendly organizations in the United States.To advance the sustained, sound and steady development of China-U.S. relations serves the fundamental interests of peoples of China and the United States, he said.