太原痔疮会使大便变细吗(太原大便出血怎么治) (今日更新中)

GENEVA, Sept. 26 (Xinhua) -- Two million people worldwide are estimated to die from air pollution each year, the Geneva based World Health Organization (WHO) said in its air quality report published on Monday.According to data collected by the WHO from nearly 1,100 cities across 91 countries, elevated level of fine particle pollution, which could cause heart diseases, lung cancer, asthma and acute lower reparatory infections, are common across many urban areas, with some cities registering fine particle pollution levels 15 times as much as the WHO guidelines.For both developed and developing countries, the biggest contributors to urban outdoor air pollution include motor transport, small-scale manufacturers and other industries, burning of biomass and coal for cooking and heating, as well as coal-fired power plants.Residential wood and coal burning for space heating is said to be an important contributor to air pollution, especially in rural areas during colder months, the WHO report said.

WASHINGTON, July 20 (Xinhua) -- Using the Hubble Space Telescope, astronomers have discovered a fourth moon orbiting the icy dwarf planet Pluto, the U.S. National Aeronautics and Space Administration (NASA) announced Wednesday in a statement. The tiny, new satellite, temporarily designated P4, was uncovered in a Hubble survey searching for rings around the dwarf planet.P4 was first seen in a photo taken with Hubble's Wide Field Camera 3 on June 28. It was confirmed in subsequent Hubble pictures taken on July 3 and July 18. It is the smallest moon discovered around Pluto. It has an estimated diameter of 8 to 21 miles (13 to 34 km). By comparison, Charon, Pluto's largest moon, is 648 miles (1,043 km) across, and the other moons, Nix and Hydra, are in the range of 20 to 70 miles in diameter (32 to 113 km).Two labeled images of the Pluto system taken by the Hubble Space Telescope's Wide Field Camera 3 ultraviolet visible instrument with newly discovered fourth moon P4 circled. The image on the left was taken on June 28, 2011. The image of the right was taken on July 3, 2011."I find it remarkable that Hubble's cameras enabled us to see such a tiny object so clearly from a distance of more than 3 billion miles (5 billion km)," said Mark Showalter of the SETI Institute in California, who led this observing program with Hubble.P4 is located between the orbits of Nix and Hydra, which Hubble discovered in 2005. Charon was discovered in 1978 at the U.S. Naval Observatory and first resolved using Hubble in 1990 as a separate body from Pluto.The dwarf planet's entire moon system is believed to have formed by a collision between Pluto and another planet-sized body early in the history of the solar system. The smashup flung material that coalesced into the family of satellites observed around Pluto.The finding is a result of ongoing work to support NASA's New Horizons mission, scheduled to fly through the Pluto system in 2015. The mission is designed to provide new insights about worlds at the edge of our solar system. Hubble's mapping of Pluto's surface and discovery of its satellites have been invaluable to planning for New Horizons' close encounter."This is a fantastic discovery," said New Horizons' principal investigator Alan Stern of the Southwest Research Institute in Colorado. "Now that we know there's another moon in the Pluto system, we can plan close-up observations of it during our flyby."

WASHINGTON, Aug. 2 (Xinhua) -- The weakness of aging is associated with leaky calcium channels inside muscle cells and a drug already in Phase II clinical trials for the treatment of heart failure might plug those leaks, according to a report published Tuesday in the online edition of Cell Metabolism.Earlier studies by the research team led by Andrew Marks of Columbia University showed the same leaks underlie the weakness and fatigue that come with heart failure and Duchenne muscular dystrophy."It's interesting, normal people essentially acquire a form of muscular dystrophy with age," Marks said. "The basis for muscle weakness is the same." Extreme exercise like that done by marathon runners also springs the same sort of leaks, he added, but in that case damaged muscles return to normal after a few days of rest. A microscopic view shows smooth muscle cells derived from human embryonic stem cells showing the nuclei (blue) and proteins of the cytoskeleton (green) in this handout photo released to Reuters by the California Institute for Regenerative Medicine, March 9, 2009The leaks occur in a calcium release channel called ryanodine receptor 1 (RyR1) that is required for muscles to contract. Under conditions of stress, those channels are chemically modified and lose a stabilizing subunit known as calstabin1.Calcium inside of muscle cells is usually kept contained. When it is allowed to leak out into the cell that calcium itself is toxic, turning on an enzyme that chews up muscle cells. Once the leak starts, it's a vicious cycle. The calcium leak raises levels of damaging reactive oxygen species, which oxidize RyR1 and worsen the leak.The researchers made their discovery by studying the skeletal muscles of young and old mice. They also showed that 6-month-old mice carrying a mutation that made their RyR1 channels leaky showed the same muscular defects and weakness characteristic of older mice.When older mice were treated with a drug known as S107, the calcium leak in their muscles slowed and the animals voluntarily showed about a 50 percent increase in the amount of time spent wheel running. Now in clinical trials for patients with heart failure, the drug is known to work by restoring the connection between costabilin and RyR1.Despite considerable effort to understand and reverse age- related muscle wasting, there are no established treatments available. The new work suggests there may be hope in approaching the problem from a different angle."Most research has focused on making more muscle mass," Marks said. "What's different here is that we are focused not on muscle mass but on muscle function. More muscle doesn't help if it is not functional."

BEIJING, Sept. 20 (Xinhuanet)-- Google's executive chairman Eric Schmidt is to face a Senate hearing on whether the company is abusing its dominance in Internet search, according to media reports on Tuesday.At the Wednesday's hearing before the Senate Judiciary Committee's antitrust panel, Schmidt will argue that critics are wrong to say Google gives preference to its own products, instead, Google is just trying to deliver the best-cultivated search results for users. The issue of search ranking is a touchy subject with Google, which says its algorithm is devised to give users the most useful result so they will come back.Another focal point of the hearing, which Schmidt concerned most is "scrapers", those who game its search algorithm, for example, taking commonly searched words, combine them into a nonsensical block of text and throw it up on the Web to grab eyeballs and advertising dollars.Google believes that, if scrapers succeed too often, consumers will lose confidence in search and turn to other resources, thus posing an existential threat to the company.Regulators in the U.S. and abroad have been looking into various aspects of Google's business practices since the company's 2007 purchase of ad firm DoubleClick. At the moment, European regulators are conducting an antitrust inquiry into Google's search business while the Federal Trade Commission is doing likewise. Google relies overwhelmingly on its core product, Internet search, and dominates the market for that product. It handles around two-thirds of U.S. Internet searches and more than 80 percent in many European countries, according to comScore Inc.

SEOUL, Aug. 31 (Xinhua) -- South Korea's infant mortality rate decreased by nearly half in the last 20 years to stand as the world's 16th lowest, a report showed Wednesday.South Korea had an infant mortality rate of 2.2 per 1,000 in 2009, compared with four deaths per 1,000 newborns reported in 1990, the World Health Organization (WHO) and Save the Children, an international non-governmental organization working for children's rights, said in a joint report.With a 45 percent decline in the infant mortality rate, South Korea ranked 16th lowest among WHO member countries, down from its 88th spot in 1990, according to the report. South Korea's infant mortality rate was the same as France, Estonia and Malta. Meanwhile, the Democratic People's Republic of Korea (DPRK) also showed a decline in the infant mortality rate from 23 per 1,000 in 1990 to 18.1 per 1,000 in 2009, but still remained in the lower ranks with 125th place.

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