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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."

SAN FRANCISCO, March 22 (Xinhua) -- Apple Inc. on Tuesday announced that iPad 2, the second-generation of its popular tablet computer, will be available in China's Hong Kong, Korea, Singapore and additional countries and regions in April.The company also confirmed that iPad 2 will go on sale in 25 countries on March 25 in addition to the United States, where the device first hit market on March 11 and has seen strong demand."While competitors are still struggling to catch up with our first iPad, we've changed the game again with iPad 2," Steve Jobs, Apple's chief executive officer, said in a statement."We're experiencing amazing demand for iPad 2 in the U.S., and customers around the world have told us they can't wait to get their hands on it. We appreciate everyone's patience and we are working hard to build enough iPads for everyone," he noted.Apple had planned to released iPad 2 in Japan on March 25, but delayed the launch in the aftermath of the catastrophic March 11 earthquake and ensuing tsunami in the country.The 25 countries where iPad 2 will go on sale on March 25 include Australia, Austria, Belgium, Canada, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Mexico, the Netherlands, New Zealand, Norway, Poland, Portugal, Spain, Sweden, Switzerland and Britain.

BEIJING, Feb. 11 (Xinhua) -- China's foreign exchange regulator said Friday it did not suffer any losses from its investment in Fannie Mae and Freddie Mac bonds, adding that media reports of up to 450 billion U.S. dollars of losses were "groundless.""Up until now, the capital and interest repayments of Fannie Mae and Freddie Mac bonds is normal, and no losses have incurred," The State Administration of Foreign Exchange (SAFE) said on its website.Annual yields of the bonds were around 6 percent between 2008 and 2010, the SAFE said.The regulator, which oversees China's more than 2 trillion U.S. dollars of foreign exchange reserve, also clarifies it had not bought any stocks of the two troubled mortgage companies.UPI reported on Friday that the Obama Administration will propose phasing out the two mortgage giants after rescuing them, which is part of a U.S. Treasury Department white paper to Congress that lays out three ways of cutting government support to the 10.6 trillion U.S. dollars mortgage market.

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. 12 (Xinhua) -- China's recent revocation of a national scientific award due to academic fraud has been welcomed by the public, but experts warn the country still has a long way to go to bring an end to such dubious academic practices.On Feb. 1, China's Ministry of Science and Technology, revoked the State Scientific and Technological Progress Award (SSTPA) given to Li Liansheng, former professor of Xi'an Jiaotong University in 2005.An investigation found Li had plagiarized others' works and fabricated data in his winning project, a research on key technologies for designing and manufacturing scroll compressors. Li was investigated after the science ministry received tip-offs from six professors (including four retired) in his university.The ministry subsequently canceled his prize and retrieved the money awarded.Zhao Baojing, a senior official with the National Office for S&T Award, told Xinhua it was the first time China had withdrawn a national scientific honor.The revocation soon sparked pubic discussion over academic integrity. Tan Gang, a citizen in Shenzhen, wrote on his microblog, "Though the revocation came a bit late, it is progress. It's a warning against academic misconduct."Shi Ying, vice director of Shanxi Academy of Social Sciences, said, the move demonstrated China's "zero-tolerance" for academic fraud, and would help clean up the academic field."However, academic fraud is still rampant, which not only damages academic integrity, but also harms the innovative capacity of China in a broader sense," said Shi.Anti-fraud activist Fang Zhouzi, who runs a website on anti-academic fraud from his Beijing home, said "This is by far the harshest stance China has ever taken against academic fraud, which should be viewed as progress." He so noted China still has a long way to go in the fight against academic fraud.Fang said, the science ministry's move does not mean China is really cracking down on academic fraud. The plagiarist might have not been found out if it were not for years of unyielding efforts made by the six professors.The scandal again highlights that academic fraud is alive and well in China. A survey conducted among 30,078 respondents in 2009 by the China Association for Science and Technology (CAST) showed that nearly half of the science-related workers in China's research institutes, universities, medical institutes and hospitals think academic cheating is "common."Fang attributed the prevalence of academic fraud in China to lax punishments and loopholes in the academic evaluation system.Zero tolerance of academic fraudChina's science minister, Wan Gang, said on several occasions "We hold zero tolerance for academic fraud."However, Fang said "zero tolerance" was a slogan rather than the actual case. Many cases of academic fraud, even publicly exposed, were "tolerated" eventually. "Lax punishment makes academic fraud less costly."