中山痔疮治疗的医院(中山那家医院看外痔好) (今日更新中)

WASHINGTON, Aug. 17 (Xinhua) -- Latest research shows that the Moon could be younger than previous estimates. The findings were published online Wednesday in the Nature journal.The prevailing theory of the Moon's origin is that it was created by a giant impact between a large planet-like object and the proto-Earth. The energy of this impact was sufficiently high that the Moon formed from melted material that was ejected into space. As the Moon cooled, this magma solidified into different mineral components. Analysis of lunar rock samples thought to have been derived from the original magma has given scientists a new estimate of the Moon's age.According to this theory for lunar formation, a rock type called ferroan anorthosite, or FAN, is the oldest of the Moon's crustal rocks, but scientists have had difficulty dating FAN samples. The research team used newly refined techniques to determine the age of a sample of FAN from the lunar rock that was brought back to Earth by the Apollo 16 mission in 1972.The team analyzed the isotopes of the elements lead and neodymium to place the FAN sample's age at 4.36 billion years. This figure is significantly younger than earlier estimates of the Moon's age that range as old as the age of the solar system at 4. 568 billion years. The new, younger age obtained for the oldest lunar crust is similar to ages obtained for the oldest terrestrial minerals -- zircons from western Australia -- suggesting that the oldest crusts on both Earth and Moon formed at approximately the same time, and that this time dates from shortly after the giant impact.This study is the first in which a single sample of FAN yielded consistent ages from multiple isotope dating techniques. This result strongly suggests that these ages pinpoint the time at which the sample crystallized."The extraordinarily young age of this lunar sample either means that the Moon solidified significantly later than previous estimates, or that we need to change our entire understanding of the Moon's geochemical history," Carnegie Institute of Science's geochemist and study author Richard Carlson said.

BEIJING, May 30 (Xinhuanet) -- Chronic diseases, including heart disease, stroke, cancer, chronic respiratory diseases and diabetes, are the leading cause of mortality in China, representing 85 percent of all deaths, said a senior health official.Kong Lingzhi, deputy director of the disease prevention and control bureau under the Ministry of Health, made the remarks on Saturday at the Forum of Prevention and Control of Chronic Disease."China is facing a great challenge from chronic diseases, which has a serious impact on both the economy and society," said Kong.Each year, about 3.7 million people die before they reach 60 because of chronic diseases. There are currently 200 million hypertension patients and 90 million diabetics in China, official statistics show.To address the challenge, "the government is now drafting an inter-ministerial roadmap for chronic disease intervention, which will set targets, define responsibilities and distribute guidelines for the prevention and control of chronic diseases," she said.The initiative aims to strengthen national and global monitoring and surveillance; scale up the implementation of evidence-based measures to reduce risk factors, such as tobacco use, an unhealthy diet, physical inactivity and harmful alcohol use; and improve access to cost-effective healthcare to prevent complications, disabilities and premature death.But more importantly, the roadmap will help gain attention and support for preventing and controlling chronic diseases and place it high on government working agendas, Kong explained.The government has focused more on addressing instant health crises up to now and policy and funding support for chronic disease control and prevention was very limited, admitted Mao Qun'an, spokesman of the ministry.Given that chronic disease control requires a systematic approach, tasks such as public health education, training for medical workers (especially the grassroots ones) and policies encouraging doctors' involvement need to be carried out, he said.The ultimate goal is to prevent people from getting ill rather than treating diseases, he added.Lei Zhenglong, deputy director of the disease prevention and control bureau, said that to enhance the capacity of medical workers was now the top priority for the initiative.At present, effective disease prevention work usually contradicts the financial interests of clinical doctors, analysts said.A respiratory disease doctor surnamed He with the Peking University People's Hospital said that he came under pressure from the hospital authorities when the number of inpatients declined due to his efforts to inform his patients about chronic disease prevention.

XICHANG, Sichuan, Aug. 12 (Xinhua) -- China launched a communications satellite PAKSAT-1R for Pakistan at 0:15 a.m. Friday from the Xichang Satellite Launch Center in southwest China's Sichuan Province.The satellite was carried by a Long March-3B carrier rocket, according to the launch center. It is China's first in-orbit delivery to Asian customers and also the first commercial satellite export to international users this year.According to statistics from the control center, the satellite successfully separated from its carrier rocket and entered geostationary transfer orbit as scheduled, 26 minutes after being launched.PAKSAT-1R will provide a range of services, including broadband Internet, telecom and broadcasting, covering some regions of Europe, South Asia, the Middle East, and the eastern Africa.The contract for the PAKSAT-1R was signed in 2008 between China Great Wall Industry Corporation and the Space and Upper Atmosphere Research Commission of Pakistan.China and Pakistan share a long history of space technology cooperation. Pakistan's first low-orbit satellite, BADR-A, was launched by China in 1990 with Long March 2E rocket.

BEIJING, June 20 (Xinhuanet) -- American Cancer Society discloses that higher education appears to be a game changer when it comes to cancer, according to foreign media reports on Sunday. The research indicates that the gap is widening in cancer death rates between college graduates and those who only went to high school .Cancer death rates for those who didn’t finish high school are almost three times higher than those of college graduates. The gap was especially wide for lung cancer, but it was also palpably large for breast, colon, and prostate cancer. For lung cancer, the death rate was five times higher among the least educated Americans than the most educated.Ahmedin Jemal, ACS Vice President of Surveillance Research, said that higher smoking and obesity rates among lower-income Americans combined with less access to medical services mainly expounds the disparity.Researchers concluded that bridging the education-socioeconomic gap would have prevented about 60,000 premature cancer deaths in 2007 alone in people in the 25-64 age group.

来源：资阳报