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BEIJING, Aug. 2 (Xinhuanet) -- The first close-up pictures of the asteroid Vesta, a protoplanet that dates back to the early days of the solar system, were revealed Monday by NASA scientists.The images were taken by the U.S. space agency's Dawn robotic probe, which is two weeks into a planned year-long survey of the second largest object in the main asteroid belt, located between Mars and Jupiter.About twice the size of California, Vesta is second in size only to Ceres, Dawn's next target and, along with Pluto, one of just five known dwarf planets. NASA is spending 466 million dollars to explore Vesta and Ceres during the course of a 10-year mission.Images from Dawn show Vesta a surprisingly diverse terrain and several unexplained geologic features. Chaotic terrain near the south pole is dominated by a towering central peak and huge ripple-like grooves stretching around its equatorial belt. Bright spots, dark pits and craters are filled with unexplained streaks of black and white debris. Terrain north of the grooves is much more heavily cratered.Scientists believe Vesta grew from a clump of gas and dust left over after the sun's birth some 4.65 billion years ago, a supernova explosion, which added radioactive materials to the growing body.Dawn will spend about a year circling Vesta, tweaking its orbit and altitude using an innovative technology called ion propulsion system, chief engineer Marc Rayman with NASA's Jet Propulsion Laboratory in California said.The ion propulsion system will enable Dawn to leave Vesta's orbit after a year of study and head off to Ceres, which is the largest object in the asteroid belt.

BERLIN, June 8 (Xinhua) -- The deadly strain for the E. coli outbreak was found again on cucumbers, authorities of German state Saxony-Anhalt said on Wednesday. The strain O104 was found on the scraps of cucumbers in a dustbin in the eastern city of Magdeburg, said State Health Minister Holger Paech.The dustbin belongs to a family in which three members have been ill. Paech said. The father only suffered a slight stomach upset, while the mother was once treated at a hospital and is now released. Their daughter is suffering from hemolytic-uremic syndrome (HUS), a serious complication from the infection of E. coli.However, experts were not clear about how the bacteria came to the cumbers, which have been in the dustbin for a week and a half."It is not clear and we are not able to determine how it reached there." Paech said.German authority first detected such bacteria from Spanish cucumbers on May 26, which has been overthrown by the laboratory tests in Hamburg last Tuesday.On Sunday, German State Lower Saxony issued a warning on bean sprouts as a possible source for the outbreak, which was proven to be negative on Monday.The German government has faced increasing criticism from abroad and at home for dealing with this crisis, as it has wrongly blamed the source of the infection for twice and there is a lack of coordination between different research institutes on the outbreak.John Dalli, European Union Health Commissioner, was quoted by local daily Die Welt saying "we have to rely on the experience and expertise across Europe, and even outside Europe."The Max Planck Institute for Infection Biology in Berlin also called for a federal government representative to coordinate the various government agencies which are dealing with the crisis.A federal government representative could increase cooperation between ministries and reduce mixed messages from the government, said director Stefan Kaufmann.On the same day, Germany's national disease control center, the Robert Koch Institute, said the number of infection has shown an overall decreasing trend but it is still uncertain whether the decline is due to people staying away from vegetables or to the waning of the source of infection.Until Wednesday, 25 deaths have been reported while the infection cases have increased more than 2,600 in 12 countries around the world.

Beijing, Sept. 6 (Xinhua) -- A sperm donation scandal disclosed recently has aroused growing concern in the United States.According to the New York Times' report, Ryan Kramer, the son of a donor, found that he has more than 150 half-siblings - they are all the children of the same donor."It's wild when we see them all together - they all look alike," said Cynthia Daily, mother of Kramer.As more women choose to have children on their own, the demand for sperm donors has surged.Some sperm banks are earning huge profits by allowing too many mothers to receive sperms from the same popular donors, according to the report.And this trend will lead to risks: rare genetic diseases could be spread more widely, and the children of the same donor could meet and, unbeknownst to them, commit incest, medical experts warned.Parents and donors are calling for a tighter regulation so that donor children can know more about their donors, and the number of kids from each donor can be limited.

WASHINGTON, Sept. 15 (Xinhua) -- The rates of new lung cancer cases in the United States dropped among men in 35 states and among women in six states between 1999 and 2008, according to a report released Thursday by the Centers for Disease Control and Prevention (CDC).Among women, lung cancer incidence decreased nationwide between 2006 and 2008, after increasing steadily for decades.The decrease in lung cancer cases corresponds closely with smoking patterns across the nation, the report said. In the West, where smoking prevalence is lower among men and women than in other regions, lung cancer incidence is decreasing faster. Studies show declines in lung cancer rates can be seen as soon as five years after smoking rates decline.The report also noted that states that make greater investments in effective tobacco control strategies see larger reductions in smoking; and the longer they invest, the greater the savings in smoking -- related health care costs. Such strategies include higher tobacco prices, hard-hitting media campaigns, 100 percent smoke-free policies, and easily accessible quitting treatments and services for those who want to quit."Although lung cancer among men and women has decreased over the past few years," said CDC Director Thomas Frieden in a statement. "too many people continue to get sick and die from lung cancers, most of which are caused by smoking. The more we invest in proven tobacco control efforts, the fewer people will die from lung cancer."Lung cancer is the most commonly diagnosed cancer, and the leading cause of cancer death in the United States. Cigarette smoking and exposure to secondhand smoke cause most lung cancer deaths in the United States.