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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."

CHIAYI, Feb. 26 (Xinhua) -- Chen Yunlin, the Chinese mainland chief negotiator with Taiwan, discussed cooperation prospects on Friday with fishermen and farmers in Chiayi in southern Taiwan.Chen, president of the mainland's Association for Relations Across the Taiwan Straits (ARATS), led a 50-member delegation and spoke at a seminar attended by more than 70 business people from both the mainland and Taiwan.He said small and medium-sized enterprises on both sides "played an important role in cross-Strait economic development, employment and in maintaining social stability.""Small- and medium-sized businesses are an important part of cross-Strait economic exchanges," he said, adding that among the more than 80,000 Taiwanese enterprises investing on the mainland, over 50 percent are small and medium-sized companies.Chen said that efforts should be made to enhance cooperation between small and medium-sized enterprises on the mainland and those in central and southern Taiwan.The mainland delegation arrived in Chiayi from Kaohsiung after investigating the investment environment with local business leaders. They arrived in Taipei on Wednesday at the invitation of Chiang Pin-kung, chairman of Taiwan's Straits Exchange Foundation (SEF). Both the SEF and the ARATS are authorized by the two sides to handle cross-Strait affairs.Chen said that since 2005, the mainland bought a large amount of farm and fishing products from Taiwan, which greatly boosted sales of Taiwanese products."Many renowned mainland distribution firms are present here at the seminar to seek cooperation opportunities with Taiwan's farmers and fishermen so that the sale of Taiwanese products on the mainland could increase steadily," he said.Chiang said the farming and fishing industries were the most important sectors in southern Taiwan.He added that the tax-reduction plan of the cross-Strait Economic Cooperation Framework Agreement's (ECFA) "early harvest" program, which took effect on January 1, covered 13 categories for farming products and five categories for fishing goods. Chiang said the plan was an opportunity for the industry to expand its exports to the mainland.He noted that the "early harvest" program's duty exemption also covered sectors like textiles, machinery components, and "all related to small- and medium-sized enterprises."Chiang said Friday's seminar was meant to promote cooperation between smaller businesses across the Strait, to deepen the effect of the ECFA to benefit both sides.The mainland delegation will continue its trip in southern Taiwan and return to Taipei late Saturday. They will visit Taipei's Neihu Industrial Park on Sunday before leaving the island on Monday.

BEIJING, Jan. 30 (Xinhua) -- A total of 248 people were arrested in China last year for involvement in food safety cases, food safety authorities said Sunday.The country dealt with 130,000 cases involving food safety last year, including 115 criminal cases, according to a statement of the National Food Safety Regulating Work Office.The cases touched upon such areas as production of edible agricultural produce, food production, food circulation, catering services and food exports and imports,"No major incident occurred last year, and the overall food safety situation maintained stable," said the statement.Last year also saw a nationwide crackdown on "gutter oil", usually made from discarded kitchen waste that has been refined, after media reports that it was commonly used by small restaurants.Since July when the State Council, or Cabinet, ordered the eradication of "gutter oil", 165.7 tons of edible oil has been confirmed to have been disqualified and produced by unknown sources.Chinese authorities since July last year have also cracked down on the use of undisposed tainted milk powder produced before the melamine scandal of 2008.About 2,132 tonnes of melamine-tainted milk powder was seized in the latest crackdown, the statement said.A total of 191 officials were punished for failing to do their duty in food safety enforcement, with 26 of them fired, it said.In July last year, Dongyuan milk powder, produced in west China's Qinghai Province, was found to contain excessive levels of melamine, a toxic chemical normally used in the manufacturing of plastics, which triggered the nationwide crackdown.It is the latest blitz on tainted milk products since 2008 when melamine-tainted milk powder killed at least six infants and sickened 300,000 children across the country.

SAN FRANCISCO, May 3 (Xinhua) -- Apple Inc. announced on Tuesday that it has updated its iMac all-in-one desktop, adding Intel's next generation quad-core processors, Thunderbolt data ports and a new HD camera.Starting at 1,199 U.S. dollars, the new iMac is up to 70 percent faster and its new graphics deliver up to three times the performance of the previous generation, Apple said in a statement.The new iMac features quad-core Intel Core i5 processors with an upgrade option to Core i7 processors.The 21.5-inch model has a single Thunderbolt port while the 27- inch has two, in addition to four USB 2.0 inputs and a FireWire 800 port.Thunderbolt, which debuted with Apple's updated MacBook Pro notebooks in February, is also an Intel design bringing together high-speed data transfer and high-definition display onto a single cable. It can transfer a full-length HD movie in less than 30 seconds with a speed of 10 gigabits per second, which is twice the speed of USB 3.0, 12 times faster than FireWire 800 and up to 20 times faster than USB 2.0.The new iMac also includes a built-in FaceTime HD camera, which supports high-definition video calls, Apple said.

WELLINGTON, May 24 (Xinhua) -- New Zealand researchers have found a way to stop the growth of certain cancer tumors by " silencing" a group of PAX genes, members of a small family of genes that play important roles in embryonic development, but also allow cancer cells to grow and divide in adult tissue.In an article published in UK medical journal Oncogene, Otago University Professor Michael Eccles and colleagues revealed how they used the PAX8 gene to kill cancer cells.After detecting high levels of PAX8 protein in the majority of kidney, ovarian and thyroid cancers they studied, the researchers used molecular techniques to silence the PAX8 gene in several cancer cell lines."We found that these PAX8-depleted cancer cells ceased growing and dividing. The cells were essentially stopped in their tracks through the failure of multiple mechanisms and pathways crucial to their cell division cycle. They then entered into a state called senescence in which they no longer divided, and after that they ultimately died," Eccles said in a statement from the university Tuesday.The findings suggested that PAX8 could be a good target for the development of new cancer therapies, he said."Any resulting drugs would be a long way down the road, but in the meantime this research helps confirm that a focus on PAX genes may prove to be a fruitful line of attack against a number of cancers," he said.The research was supported by grants from the Health Research Council of New Zealand. It formed the main piece of work carried out by Otago doctoral graduate Caiyun (Grace) Li, now a postdoctoral fellow at Stanford University. Study co-authors also included Professor Antony Braithwaite and master's student Jen Nyman.In 2003, research led by Eccles discovered that proteins from one or more of the nine PAX genes were present in many common cancers. They found that "silencing" the gene expression of PAX2 in ovarian and bladder cancer cells, and of PAX3 in melanoma, led to the rapid death of the cells.