宜宾激光祛斑美白(宜宾双眼皮效果图) (今日更新中)

New York, Sept. 23 (Xinhua) -- A Chinese scientist was presented a prestigious U.S. award on Friday for the discovery of artemisinin, a drug therapy for malaria that has saved millions of lives across the globe, especially in the developing world.Pharmacologist Tu Youyou, 81, became the first scientist on the Chinese mainland to win Lasker Award, known as "America's Nobels" for their knack of gaining future recognition by the Nobel committee.Tu, a scientist at the China Academy of Chinese Medical Sciences in Beijing, pioneered a new approach to malaria treatment that has benefited hundreds of millions of people and promises to benefit many times more. By applying modern techniques and rigor to a heritage provided by 5000 years of Chinese traditional practitioners, she has delivered its riches into the 21st century."Not often in the history of clinical medicine can we celebrate a discovery that has eased the pain and distress of hundreds of millions of people and saved the lives of countless numbers of people, particularly children, in over 100 countries," Lucy Shapiro, a member of the award jury and professor of Stanford University, said while describing Tu' s discovery.Shapiro said the discovery, chemical identification, and validation of artemisinin, a highly effective anti-malarial drug, is largely due to the "scientific insight, vision and dogged determination" of Professor Tu and her team. She thought Professor Tu's work has provided the world with arguably the most important pharmaceutical intervention in the last half century."The discovery of artemisinin is a gift to mankind from traditional Chinese medicine," Tu said while receiving the award. "Continuous exploration and development of traditional medicine will, without doubt, bring more medicines to the world."

LOS ANGELES, June 23 (Xinhua) -- The sun and its inner planets may have formed differently than previously thought, NASA's Jet Propulsion Laboratory (JPL) said on Thursday.Data revealed differences between the sun and planets in oxygen and nitrogen, which are two of the most abundant elements in our solar system, said JPL in Pasadena, Los Angeles.Although the difference is slight, the implications could help determine how our solar system evolved, JPL said.NASA researchers drew the conclusion after analyzing samples returned by NASA's 2004 Genesis mission, according to JPL.The air on Earth contains three different kinds of oxygen atoms which are differentiated by the number of neutrons they contain. Nearly 100 percent of oxygen atoms in the solar system are composed of O-16, but there are also tiny amounts of more exotic oxygen isotopes called O-17 and O-18. Researchers studying the oxygen of Genesis samples found that the percentage of O-16 in the sun is slightly higher than on Earth or on other terrestrial planets. The other isotopes' percentages were slightly lower."We found that Earth, the moon, as well as Martian and other meteorites which are samples of asteroids, have a lower concentration of the O-16 than does the sun," said Kevin McKeegan, a Genesis co-investigator from University of California, Los Angeles (UCLA) and the lead author of one of two papers published this week in Science journal. "The implication is that we did not form out of the same solar nebula materials that created the sun -- just how and why remains to be discovered." Another paper detailed differences between the sun and planets in the element nitrogen. Like oxygen, nitrogen has one isotope, N- 14, that makes up nearly 100 percent of the atoms in the solar system, but there is also a tiny amount of N-15. Researchers studying the same samples saw that when compared to Earth's atmosphere, nitrogen in the sun and Jupiter has slightly more N-14, but 40 percent less N-15. Both the sun and Jupiter appear to have the same nitrogen composition. As is the case for oxygen, Earth and the rest of the inner solar system are very different in nitrogen."These findings show that all solar system objects including the terrestrial planets, meteorites and comets are anomalous compared to the initial composition of the nebula from which the solar system formed," said Bernard Marty, a Genesis co- investigator from Petrographic and Geochemical Research Center in Fracne and the lead author of the other new Science paper. " Understanding the cause of such a heterogeneity will impact our view on the formation of the solar system."Data were obtained from analysis of samples Genesis collected from the solar wind, or material ejected from the outer portion of the sun. This material can be thought of as a fossil of our nebula because the preponderance of scientific evidence suggests that the outer layer of our sun has not changed measurably for billions of years."The sun houses more than 99 percent of the material currently in our solar system, so it's a good idea to get to know it better, " said Genesis Principal Investigator Don Burnett of the California Institute of Technology, Pasadena, California. "While it was more challenging than expected, we have answered some important questions, and like all successful missions, generated plenty more."Genesis was launched in August 2000. The spacecraft traveled to Earth's L1 Lagrange Point about one million miles from Earth, where it remained for 886 days between 2001 and 2004, passively collecting solar-wind samples.JPL managed the Genesis mission for NASA's Science Mission Directorate, Washington. The Genesis mission was part of the Discovery Program managed at NASA's Marshall Space Flight Center in Huntsville, Alasca.

UNITED NATIONS, June 9 (Xinhua) -- Partners from UN agencies and governments, as well as civil society and the private sector gathered here Thursday to launch "Countdown to Zero: Global plan towards the elimination of new HIV infections among children by 2015 and keeping their mothers alive.""Governments and foundations that support this plan are saying: we treasure all life equally," said UN Secretary-General Ban Ki- moon, who spoke at the event. "We give all people the best possible chance. We provide health care to all who need it."This new plan, which was formulated by a Global Task Team of more than 30 governments and 50 international and national organizations, aims to bring the number of new HIV infections in children to zero by the middle of the decade and help their mothers survive.The launch of Countdown to Zero came on the sidelines of the UN High-Level Meeting on AIDS, which runs from June 8-10, and has been an opportunity for participants to take stock of gains made in combating the disease and to agree on a declaration that will direct the actions of member states to prevent and treat HIV/AIDS over the next five years.Ban told the audience at the launch that history has proven that it is possible to make great strides in fighting HIV/AIDS, with the right amount of effort and coordination."Let us not forget that some regions have nearly achieved no new infections from mother to child," he said. "If we push hard, as we have committed today, with your continued help and with the will to do what is right for the world, we can spread this success to mothers everywhere."According to the Joint UN Program on HIV/AIDS (UNAIDS), the rate of HIV/AIDS transmission from mother to child was been reduced by 26 percent from 2001 to 2009.Former U.S. President Bill Clinton, who spoke at the launch, said that he believes the time to eliminate HIV/AIDS in children is at hand."We are here because we all recognize that the time has finally come to end pediatric AIDS worldwide and we believe we can do it," he said. "We know we have the capacity to produce the medicine, we know that."Clinton emphasized the fact that HIV/AIDS is often prevalent in less developed countries. Sub-Saharan Africa remains the region that has the most HIV/AIDS infected people."There are still too many kids who are born HIV-positive," he said. "Just 22 countries account for 90 percent of those pediatric infections."He said that there are not only moral reasons for wealthier countries to help these nations by investing in their HIV/AIDS responses, but that by doing so they increase their soft power -- influence that utilizes non-coercive measures."I think its important in a world where no one wants to look weak and the military justifiably has a claim on all of our budgets, we not forget that what my secretary-of-state often refers to as soft power issues, they have a bigger impact on our long term security," Clinton said. "I think that accounts in no small measure for the presence of leaders of global corporations here at this meeting today, they know this as well."Collaboration and close coordination of responses to HIV/AIDS, Clinton said, is also essential."There are still too many places where HIV and maternal and child health groups work completely separately," he said. "That dramatically reduces the likelihood that mothers are their babies will receive the full range of care. We simply have to all work together, both within governments and all of those who are trying to help to ensure that mothers get the drugs they should and that their babies are born without the virus."Clinton said that Goodluck Jonathan, president of Nigeria, who gave a statement at the launch as well, is an excellent example of the "strong political leadership and personal commitment" necessary to defeat HIV/AIDS and reach to goals set by the Countdown to Zero plan.In his speech, Jonathan said that Africa is has banded together through the Abuja Declaration, adopted in 2001, which turned attention and resources towards public health problems on the continent, particularly HIV/AIDS."That declaration was to make African countries spend at least 15 percent of their budget on their health sector and a reasonable percentage of this would be geared towards HIV prevention and control," he said.Budgeting shortfalls for fighting HIV/AIDS in Africa must be accounted for, Jonathan said, as African countries must not rely solely on donors to fund their responses."I intend to explore in the coming months in collaboration with colleagues in sub-Saharan Africa an effective and creative funding mechanism to ensure ownership and long terms sustainability of the HIV and AIDS response in Africa," he said.

WASHINGTON, Sept. 27 (Xinhua) -- Debris from NASA's decommissioned Upper Atmosphere Research Satellite (UARS) that crashed to Earth on Saturday fell harmlessly in a remote area of the South Pacific Ocean, NASA said on Tuesday.According to the space agency, the Joint Space Operations Center at Vandenberg Air Force Base in California has determined the satellite entered the atmosphere over the Pacific Ocean at 14.1 degrees south latitude and 170.2 west longitude at midnight EDT Saturday. The debris field is located between 300 miles and 800 miles downrange, or generally northeast of the re-entry point."This location is over a broad, remote ocean area in the Southern Hemisphere, far from any major land mass," NASA announced, adding that it is "not aware of any possible debris sightings from this geographic area."NASA scientists estimated a 1-in-3,200 chance a satellite part could hit someone on earth. Therefore, any individual's odds of being struck are about one in 21 trillion.The UARS satellite, launched in 1991 from a space shuttle, was the first multi-instrumented satellite to observe numerous chemical constituents of the atmosphere with a goal of better understanding atmospheric photochemistry and transport.

CANBERRA, Sept. 23 (Xinhua) -- A genetic study on Friday found Aboriginal Australians are descended from the first people to leave Africa up to 75,000 years ago.Researchers from the University of Western Australia, Murdoch University and an international team analyzed genetic material of a 100-year-old West Australian Aboriginal man's hair, and found he was directly descended from a migration out of Africa into Asia.The study revealed that Australian Aboriginal ancestors split from the first modern human populations to leave Africa, between 64,000 and 75,000 years ago, at least 24,000 years before other human migrations.According to Dr. Joe Dortch, an archaeologist at the University of Western Australia, the discovery rewrites the history of the human species by confirming humans moved out of Africa in waves of migrations rather than in one single out-of-Africa diaspora.It also rewrites the story about how Aborigines arrived in Australia some 50,000 years ago."So far there are no [archaeological] sites that are over 50, 000 years old so it puts a time limit on that and focuses our future efforts," he said in a statement released on Friday.Dr. Dortch believes the finding will foster a sense of pride in modern Australian Aborigines."No-one else in the world can say 'I am descended from people who have been here 75,000 years'."Associate Professor Darren Curnoe, leader of the Human Evolutionary Biology Lab in the School of Biological, Earth & Environmental Sciences at the University of New South Wales, said the study powerfully confirms that Aboriginal Australians are one of the oldest living populations in the world, certainly the oldest outside of Africa."Australians are truly one of the world's great human populations and a very ancient one at that, with deep connections to the Australian continent and broader Asian region. About this now there can be no dispute," he told Xinhua in an email note.Meanwhile, Professor Alan Cooper, Director of the Australian Centre for Ancient DNA (ACAD) at the University of Adelaide, said while this is a major step forward, the key unresolved question remains the unique story of Aboriginal history within Australia, such as what has happened in those 50,000 years of life in the harsh Australian environment."Unfortunately, the information from a single individual tells us very little about this fascinating, and critically important part of human history. Aborigines are one of the oldest continuous human populations outside Africa, as they note in the paper, and due to the geographic isolation and limited archaeological records remain one of the most mysterious chapters in human history," he told Xinhua on Friday.The study is published on Friday in the journal Science.Indigenous Australians are the original inhabitants of the Australian continent and nearby islands. They together make up more than 2.5 percent of Australia's population.

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