成都治疗大隐静脉曲张要多少钱(成都做腿部静脉曲张手术多少钱) (今日更新中)

WASHINGTON, April 5 (Xinhua) -- NASA and co-researchers from the United States, the Republic of Korea and Japan have found a new mineral named "Wassonite" in one of the most historically significant meteorites recovered in Antarctica in December 1969, the U.S. space agency said on Tuesday in a statement.The new mineral was discovered within the meteorite officially designated Yamato 691 enstatite chondrite. The meteorite likely may have originated from an asteroid orbiting between Mars and Jupiter. Wassonite is among the tiniest, yet most important, minerals identified in the 4.5-billion-year-old sample.The research team, headed by NASA space scientist Keiko Nakamura-Messenger, added the mineral to the list of 4,500 officially approved by the International Mineralogical Association."Wassonite is a mineral formed from only two elements, sulfur and titanium, yet it possesses a unique crystal structure that has not been previously observed in nature," said Nakamura-Messenger.In 1969, members of the Japanese Antarctic Research Expedition discovered nine meteorites on the blue ice field of the Yamato Mountains in Antarctica. This was the first significant recovery of Antarctic meteorites and represented samples of several different types.As a result, the United States and Japan conducted systematic follow-up searches for meteorites in Antarctica that recovered more than 40,000 specimens, including extremely rare Martian and lunar meteorites.Researchers found Wassonite surrounded by additional unknown minerals that are being investigated. The mineral is less than one-hundredth the width of a human hair or 50x450 nanometers. It would have been impossible to discover without NASA's transmission electron microscope, which is capable of isolating the Wassonite grains and determining their chemical composition and atomic structure."More secrets of the universe can be revealed from these specimens using 21st century nano-technology," said Nakamura- Messenger.The new mineral's name was approved by the International Mineralogical Association. It honors John T. Wasson, professor at the University of California, Los Angeles. Wasson is known for his achievements across a broad swath of meteorite and impact research, including the use of neutron activation data to classify meteorites and to formulate models for the chemical makeup of bulk chondrites.

BEIJING, May 4 (Xinhuanet) -- Children with autism have slightly bigger brains than children without the condition, a study suggests.The research published in the May issue of Archives of General Psychiatry noted the difference in the brain size appears related to increased rates of brain growth before age 2.The researchers from the University of North Carolina also pointed out that though the enlargement continues, the increased growth does not.In 2005, the researchers studied a group of 2-year-old children, and found out the ones with autism had brains that were 5% to 10% larger than children without it.Now the researchers assessed the same group of children at age 5, the psychiatrists re-scanned the brains of 38 children with autism and 21 without the condition. The autistic children still had slightly larger brains, but they had grown at the same rate as the comparison group.This finding could lead to a better understanding of the genes that drive autism, which, in turn, could lead to earlier identification and treatment of the disorder, said study researcher Joseph Piven, MD, according to media report.

BEIJING, Jan. 25 (Xinhua) -- A senior Chinese official has encouraged the country's young jurists to more actively participate in the country's legislative process and better serve the practice of law enforcement.Zhou Yongkang, a member of the Standing Committee of the Political Bureau of the Communist Party of China (CPC) Central Committee, made the remarks in meeting with outstanding youth law science experts on Tuesday in Beijing.Zhou said young experts on law science should pay more attention to practical problems in China's legal construction and propose more insights, advice and suggestions.Young experts should study more problems encountered by common people and better serve the people with their knowledge, Zhou said.Ten experts on law science from the Renmin University of China, China University of Political Science and Law and other universities and Chinese Academy of Social Sciences were awarded the honor of national outstanding young jurists by the China Law Society.

ADDIS ABABA, Jan. 28 (Xinhua) -- The on-going political crisis in Cote d’Ivoire should be and can be solved peacefully, Chinese Envoy and Assistant Foreign Minister Liu Zhenmin told Xinhua here on Friday, ahead of the 16th African Union (AU) summit scheduled for Jan. 30-31.Liu was in the Ethiopian capital Addis Ababa, the headquarters of the 53-member African bloc, to attend the summit as special envoy of the Chinese government.Cote d'Ivoire has been trapped in a political impasse since the landmark presidential run-off held on Nov. 28. Both incumbent Laurent Gbagbo and opposition leader Alassane Ouattara claimed victory and swore themselves in as president, and formed their respective government.Gbagbo was backed by the country's Constitutional Council, while Ouattara has the support of the electoral commission and the international community including the United Nations (UN), the AU, the Economic Community of West African States (ECOWAS), the United States and France.China hopes various parties and stakeholders in Cote d’Ivoire can resolve their disputes through dialogues and consultations based on the interest of the country and its people, and maintain peace and stability, Liu said.A peaceful solution to the crisis is not only in the interests of the Ivorian people, but of the West African region as a whole, according to Liu.China appreciates the efforts made by the AU and ECOWAS to find a peaceful solution to the crisis, and will continue supporting Africa’s efforts to resolve the crisis peacefully, Liu said.According to the UN, more than 200 people have died from violence during the power struggle between Gbagbo and Ouattara.The 16th AU summit, to be held under the theme “Towards Great Unity and Integration Through Shared Values,” will gather heads of states and government from member states to discuss issues including Africa’s integration, and peace and security in the continent. The situation in Cote d’Ivoire, among others, is expected to top the agenda of the summit.

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."

来源：资阳报