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WASHINGTON, June 6 (Xinhua) -- Women who have higher levels of the appetite-controlling hormone leptin have fewer symptoms of depression, and this apparent inverse relationship is not related to body mass index (BMI), a new study finds. The results were presented Monday at The Endocrine Society's 93rd Annual Meeting in Boston, the United States."Animal data suggest that leptin may reduce anxiety and improve depression. Our study in women suggests that leptin may indeed have antidepressant qualities," said the study's lead author, Elizabeth Lawson, of Massachusetts General Hospital and Harvard Medical School in Boston.Leptin, the product of fat cells, signals satiety, or fullness. It is low in thin women and high in obese women, according to Lawson. She also said there is an increased prevalence of anxiety and depression in certain conditions in which leptin levels are typically low. These include the eating disorder anorexia nervosa, in which there is abnormally low weight and body fat, and functional hypothalamic amenorrhea, in which women have stopped menstruating despite having normal weight."It is unknown whether low leptin levels contribute to the development of mood disorders in these women," Lawson said.She and her co-workers studied the relationship between leptin levels and symptoms of anxiety and depression in 64 women. Fifteen of the women had anorexia nervosa, 12 were normal weight with hypothalamic amenorrhea, 20 were normal weight and in good health, and 17 were overweight or obese but still healthy.All subjects were asked questions to assess symptoms of depression and anxiety, with high scores indicating more symptoms. Besides measuring leptin levels in the blood, the researchers assessed the women's BMI, a measure of weight for height.The relationship between leptin and depression symptoms was independent of BMI. This finding indicates that leptin may mediate symptoms of depression and that this effect is not a function of low weight, Lawson said."Further research administering leptin to humans will be important in understanding whether this hormone has a potential role in the treatment of depression," she said.

SANTO DOMINGO, Aug. 19 (Xinhua) -- The number of deaths caused by cholera in the Dominican Republic have increased to 109, and there are 15,876 suspect cases, according to government figures released on Friday.Public Health Ministry said in a statement that the intensity of the outbreak has been decreasing since six weeks ago, but the region of Gran Santo Domingo, which includes the Dominican capital city, still faces a serious epidemic situation.The government is developing preventive measures which include informing the population, careful observation of diarrhea cases, providing drinkable water and building new public toilets as part of efforts to contain the outbreak, it added.The latest Cholera outbreak appeared in the Dominican Republic last November, a month after cases were reported in Haiti.The Ministry said they stepped up efforts to monitor the situation after tropical storm "Emily" passed through parts of the country two weeks ago.After the beginning of the rain season, cholera cases have increased generally and all the public hospitals in the country are provided with supplies and medical staff to care for the people with symptoms of cholera or other tropical diseases.

BEIJING, July 26 (Xinhuanet) -- Hong Kong scientists announced that they had determined the idea of time travel is impossible by proving nothing can travel faster than the speed of light.The finding is contained in a study done by a research team from Hong Kong University of Science and Technology. The study was published Monday in a scientific journal "Physical Review Letters" in the United States."The study, which showed that single photons also obey the speed limit c, confirms Einstein's causality, that is, an effect cannot occur before its cause," the university said on its website."By showing that single photons cannot travel faster than the speed of light, our results bring a closure to the debate on the true speed of information carried by a single photon." said Professor Du Shengwang, who led the study.The possibility of time travel was raised 10 years ago when scientists discovered the optical pulses in some specific medium might propagate information in a faster-than-light speed."Our findings will also likely have potential applications by giving scientists a better picture on the transmission of quantum information." Du said.

MOSCOW, Sept. 13 (Xinhua) -- Russian federal space agency -- Roscosmos -- has announced that it would launch four more spacecraft in the forthcoming four months, including two Soyus manned spacecraft to the International Space Station (ISS).In accordance with the work schedule of Roscosmos, two cargo spaceships -- of the "Progress" type -- will be launched on Oct.30, 2011 and on Jan.26, 2012, while the two manned spacecraft will be blast off on Nov.12 and Dec.20.Roscosmos said on Tuesday it had been conducting consultations with NASA over updated plans of the upcoming expeditions to the ISS.According to Roscosmos, the new launch schedule has been drafted on the basis of an investigation into an abortive launch of a cargo spaceship on Aug. 24, when the Progress M-12M cargo spaceship failed to reach the orbit due to a rocket malfunction. Russia announced on the same day to delay its future launches of manned spaceship to ISS.After the retirement of the U.S. space shuttle fleet, Russia's Soyuz spacecraft has become the only way for astronauts to reach the ISS until at least the middle of this decade.