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WASHINGTON, April 4 (Xinhua) -- The U.S. National Aeronautics and Space Administration (NASA) announced on Monday that following discussions among the International Space Station partners on Sunday, it is delaying the launch of space shuttle Endeavour's STS- 134 mission to April 29 from April 19.The new launch time is set for 3:47 p.m. EDT (1947 GMT) on Friday, April 29."The delay removes a scheduling conflict with a Russian Progress supply vehicle scheduled to launch April 27 and arrive at the station April 29," NASA said in a statement.NASA managers will hold a Flight Readiness Review on Tuesday, April 19, to assess the team's readiness to support launch. An official launch date will be selected at the conclusion of the meeting.Endeavour will deliver to the space station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer.

LOS ANGELES, March 23 (Xinhua) -- People who are more physically active are less likely to have high blood pressure associated with a high-sodium diet, a new study suggests.The study was conducted by researchers at the Tulane University School of Public Health and Tropical Medicine in New Orleans, HealthDay News reported on Wednesday.Study findings were presented at the on-going American Heart Association's meeting on nutrition, physical activity and cardiovascular disease, held in Atlanta, said the report.To explore a potential association between exercise and the hypertensive role of dietary salt, the researchers focused on roughly 1,900 men and women (average age 38) living in a rural region in northern China. None took blood pressure medication during the study, according to the report.For one week all of the participants consumed 3,000 mg of sodium a day in their diet; for another week, they were placed on a high-sodium diet -- 18,000 mg per day.Nine blood pressure readings were taken each week, and questionnaires were completed to assess routine levels of physical activity, ranging from "very active" to "quite sedentary."When switching from the lower-sodium to a high-sodium diet, those who experienced a 5 percent or greater boost in their systolic blood pressure (the heart contraction measure represented by the top figure of a blood pressure reading) were deemed "high salt-sensitive."Those reporting the most physical activity had a 38 percent lower risk of being highly salt-sensitive than the least active group. This group was the least likely to see a 5 percent or greater rise in their blood pressure in response to a high-salt diet.Compared with the most sedentary group, those in the next-to- highest activity group had a 17 percent lower risk of salt- sensitivity, and those in the next-to-lowest activity group had a 10 percent lower risk.The team concluded that engaging in physical activity has a " significant," independent and progressively healthful impact on the degree to which salt sensitivity relates to blood pressure."For those with low physical activity, their blood pressure will increase more if they increase their sodium intake," study co- author Dr. Jiang He, chair of the department of epidemiology at the school, said in remarks published by HeathDay News."It's a little bit of a surprise," He added. "But this is the first study to look at this particular association between physical activity and salt sensitivity and blood pressure. But after thinking it over it makes sense, because we already know that physical activity will reduce blood pressure."High blood pressure, or hypertension, is a leading cause of stroke. Because of salt's association with high blood pressure, the American Heart Association recommends consuming less than 1, 500 mg of sodium per day.

BEIJING, Jan. 30 (Xinhua) -- A total of 248 people were arrested in China last year for involvement in food safety cases, food safety authorities said Sunday.The country dealt with 130,000 cases involving food safety last year, including 115 criminal cases, according to a statement of the National Food Safety Regulating Work Office.The cases touched upon such areas as production of edible agricultural produce, food production, food circulation, catering services and food exports and imports,"No major incident occurred last year, and the overall food safety situation maintained stable," said the statement.Last year also saw a nationwide crackdown on "gutter oil", usually made from discarded kitchen waste that has been refined, after media reports that it was commonly used by small restaurants.Since July when the State Council, or Cabinet, ordered the eradication of "gutter oil", 165.7 tons of edible oil has been confirmed to have been disqualified and produced by unknown sources.Chinese authorities since July last year have also cracked down on the use of undisposed tainted milk powder produced before the melamine scandal of 2008.About 2,132 tonnes of melamine-tainted milk powder was seized in the latest crackdown, the statement said.A total of 191 officials were punished for failing to do their duty in food safety enforcement, with 26 of them fired, it said.In July last year, Dongyuan milk powder, produced in west China's Qinghai Province, was found to contain excessive levels of melamine, a toxic chemical normally used in the manufacturing of plastics, which triggered the nationwide crackdown.It is the latest blitz on tainted milk products since 2008 when melamine-tainted milk powder killed at least six infants and sickened 300,000 children across the country.

LOS ANGELES, April 8 (Xinhua) -- NASA's Wide-field Infrared Survey Explorer (WISE) has discovered a rare asteroid that traces out a horseshoe shape relative to Earth, the Jet Propulsion Laboratory (JPL) said on Friday.Unlike most near-Earth asteroids (NEAs) that have eccentric, or egg-shaped, orbits that take the asteroids right through the inner solar system, the new object has an orbit that is almost circular such that it cannot come close to any other planet in the solar system except Earth, JPL said.However, even though the asteroid rides around with Earth, it never gets that close, said JPL in Pasadena, Los Angeles.As the asteroid approaches Earth, the planet's gravity causes the object to shift back into a larger orbit that takes longer to go around the sun than Earth. Alternately, as Earth catches up with the asteroid, the planet's gravity causes it to fall into a closer orbit that takes less time to go around the sun than Earth, according to JPL.The asteroid therefore never completely passes our planet. This slingshot-like effect results in a horseshoe-shaped path as seen from Earth, in which the new object, designated 2010 SO16, takes 175 years to get from one end of the horseshoe to the other, JPL said."The origins of this object could prove to be very interesting, " said Amy Mainzer of JPL, the principal investigator of NEOWISE, which is the asteroid- and comet-hunting portion of the WISE survey mission. "We are really excited that the astronomy community is already finding treasures in the NEOWISE data that have been released so far."JPL manages and operates the WISE for NASA's Science Mission Directorate, Washington.

BEIJING, Jan. 22 (Xinhua) -- The Chinese central government in Beijing pledged Saturday that it would work to ensure smooth and safe traveling for the public as many return home to reunite with families during the Spring Festival.It is expected that some 700 million people are to travel during a 40-day Spring Festival travel period that began Wednesday, but heavy snow and icy rain, which has continued since the new year began, has disrupted traffic and cut water and power supplies to some regions in south and southwest China.The lingering freezing weather also poses great challenges to transportation and railway authorities, as they work to avoid another travel disaster, as was seen in early 2008 when unprecedented heavy snow and freezing rain inundated the south of the country, bringing traffic to a standstill at the peak holiday season.Due to this, the Ministry of Public Security announced on Saturday that it had drawn upon the experiences gained from the 2008 weather disaster, and has ordered local bureaus to begin planning precautionary measures to combat the freezing weather.It also issued orders to local departments beginning in late December to step up snow clearance and make sure expressways and key trunk lines are not closed by snow."More police will be deployed to maintain traffic order and security, and to reduce offences such as drunk driving, speeding, passenger overloading of cars and trucks, and driving while fatigued," Huang Ming, Vice Minister of Public Security, said in a press conference held in Beijing.Meanwhile, over 8,300 service stops would be established across the country in order to provide necessities such as water and medical help to drivers and migrant works returning home for the festival.China's meteorological authority forecast Saturday that snowy weather will weaken in most regions over the next three days, but the eastern areas in southwest China will continue to see more rain and snow.On Sunday, the weather forecast anticipated that moderate snow would hit some regions in Inner Mongolia, Guangxi, and Hainan, as the southwestern province of Guizhou will see more icy rain.Local authorities said nearly 10 million have been affected in Hunan after a blizzard that started Monday, which also forced the evacuation of 73,000 people. About 15 power lines were shut down and 132 roads were closed because of snow and icy rain in Guangxi.As the freezing weather makes travel on roads more difficult, railway stations are seeing surges in passenger numbers.An official with the Ministry of Railways (MOR) said nearly 4.8 million passengers took trains on Jan. 19, the first day of the travel peak season this year, up 11.9 percent compared to the corresponding day last year. The next day, over 4.9 million passengers traveled on railways, up 17.5 percent. The Nanchang railway station even saw passenger number jump 30 percent.The MOR said earlier that it would run an additional 293 pairs of trains per day during the rush period in order to meet climbing passenger demand.Further, the Vice Minister of the country's National Development and Reform Commission, the country's top economic planning body, said the ministry would work with other government departments to implement multiple measures in maintaining a stable supply of coal, electricity, oil, and gas so that residents' demands for heating and power use can be met during the festival.The traditional Chinese Spring Festival, or chun jie in Chinese, is the country's most important festival. It falls on Feb. 3 this year. Workers nationwide enjoy a seven-day holiday that ends on Feb. 8.

来源：资阳报