中山肛瘘的手术费用多少(中山市医院外痔专家) (今日更新中)

WASHINGTON, June 9 (Xinhua) -- Observations from NASA's Voyager spacecraft suggest the edge of our solar system may not be smooth, but filled with a turbulent sea of magnetic bubbles, the U.S. space agency said Thursday in a statement.While using a new computer model to analyze Voyager data, scientists found the sun's distant magnetic field is made up of bubbles approximately 100 million miles wide. The bubbles are created when magnetic field lines reorganize. The new model suggests the field lines are broken up into self-contained structures disconnected from the solar magnetic field. The findings are described Thursday in the Astrophysical Journal.Like Earth, our sun has a magnetic field with a north pole and a south pole. The field lines are stretched outward by the solar wind or a stream of charged particles emanating from the star that interacts with material expelled from others in our corner of the Milky Way galaxy.The Voyager spacecraft, more than nine billion miles away from Earth, are traveling in a boundary region. In that area, the solar wind and magnetic field are affected by material expelled from other stars in our corner of the Milky Way galaxy."The sun's magnetic field extends all the way to the edge of the solar system," said astronomer Merav Opher of Boston University. "Because the sun spins, its magnetic field becomes twisted and wrinkled, a bit like a ballerina's skirt. Far, far away from the sun, where the Voyagers are, the folds of the skirt bunch up."Understanding the structure of the sun's magnetic field will allow scientists to explain how galactic cosmic rays enter our solar system and help define how the star interacts with the rest of the galaxy.So far, much of the evidence for the existence of the bubbles originates from an instrument aboard the spacecraft that measures energetic particles. Investigators are studying more information and hoping to find signatures of the bubbles in the Voyager magnetic field data."We are still trying to wrap our minds around the implications of the findings," said University of Maryland physicist Jim Drake, one of Opher's colleagues.Launched in 1977, the Voyager twin spacecraft have been on a 33- year journey. They are en route to reach the edge of interstellar space. NASA's Jet Propulsion Laboratory built the spacecraft and continues to operate them.

JAKARTA, Sept. 21 (Xinhua) -- Comprehensive efforts are needed to save coral reefs as their living compound is prone to environmental damage, an Indonesian expert told Xinhua in an exclusive interview on Tuesday.Nurul Dhewani Mirah Sjafrie, coordinator of Coral Reef Information and Training Center (CRITC) for western Indonesia at the Indonesian Science Institute, the government think-tank institution, said that currently only more than five percent of coral reefs in Indonesia are in "excellent condition.""Based on monitoring of the thousands of observation stations we have, the rest are in damage, bad and moderate condition," Sjafrie said in her office.She said that it is not impossible to increase the number as long as all people are aware of the importance to save coral reefs."People should be aware that coral reefs live in sea with warm enough temperature of 18-25 Celsius degree with certain level of brightness, among others. If the requirements are fulfilled, we can see coral reef growing safely," said Sjafrie.She also said it needs upstream-to-downstream arrangement to support the efforts."For example, in western Indonesia, we have many big rivers. If illegal logging practice keeps continuing, it will cause sedimentation in the sea. It means there is a decreasing quality. So, coral reef salvation is not only conducted in ocean," Sjafrie said.She also expressed concern that many people dump garbage in rivers."They throw their garbage in plastic bags. For plastic only, it takes 100 years to be completely decomposed. Let's say 10-15 percent of our people do the malpractice everyday, you can imagine how many garbage entering the sea," she said.Sjafrie said that the key to guard coral reef sustainability is in human habit."Coral reef destruction could be caused by nature such as tsunami, earthquake, crown torn (Acanthaster plancii) that consumes coral reefs. But the biggest factor is human with their destructive fishing using bombs," she said.According to Sjafrie, people do the practice with three causes, namely ignorance, needs and greed.She added that efforts have been conducted by the government, private sector and non governmental organizations (NGOs) to save coral reefs."We have a program called the CORMAP of Coral Reef Rehabilitation and Management Program. The government uses instrument of National Program of People Empowerment while NGOs do their part. If we could combine the actions, we could reach the same goal," she said.She added that the government train people to be productive by providing skills and in the same time, her organization and NGOs socialize and campaign the importance of coral reefs."When people have better jobs and activities and they are equipped with the awareness, they will do positive thing and stop destroying the sea," Sjafrie said.

BEIJING, Sept. 8 (Xinhuanet) -- Middle-aged white women drinking alcohol moderately are more likely to stay healthy than nondrinkers, according to a new study from Harvard.The study has followed about 14,000 mostly white women since 1976.As a result, compared with teetotalers, those who had 3 to 15 alcoholic drinks weekly in their late 50s were 28 percent higher of being free from physical disability, chronic illness, mental health problems, and cognitive decline at the age of 70.Even having just one or two drinks per week increased a woman's odds of good health by 11 percent.However, women should be aware that even moderate drinking has been linked to an increased risk of breast cancer, said Qi Sun, M.D., a lead author of the study and a nutrition researcher at the Harvard School of Public Health.These findings don't necessarily apply to men or to nonwhite women. But they reinforced the evidence for the health benefits of moderate drinking.

BEIJING, Aug. 1 (Xinhua) -- The provinces of Guizhou and Hunan reported their lowest levels of precipitation since 1951 in July, the China Meteorological Administration (CMA) said on Monday.Precipitation levels across the country saw a decrease of 8.7 percent from the average level of 115.9 mm in July, the lowest levels seen in 11 years, said Chen Zhenlin, an expert with the CMA.The average temperature recorded across the country in July was 22.1 degrees Celsius, up 0.7 degrees Celsius from the average level.

BEIJING, Aug. 22 (Xinhuanet) -- Researchers have discovered how a human egg captures an incoming sperm for fertilization, paving the way to help couples suffering from infertility, according to media reports on Monday.An international team of researchers found that a sugar chain known as the sialyl-lewis-x sequence (SLeX) makes the outer coat of the egg “sticky,” which has proven to be helpful in binding the egg and the sperm.As a result, this observation has filled in a huge gap in the understanding of fertility and provides hope for ultimately helping couples who currently cannot conceive.Scientists and doctors know that a sperm identifies an egg when proteins on the head of the sperm match and bind to a series of specific sugars in the egg’s outer coating. With a successful match of proteins, the outside surfaces of the sperm and egg then bind together before merging, which is then followed by delivery of sperm’s DNA into egg.To identify this molecules, the researchers used ultra-sensitive mass-spectrometric imaging technology to observe and identify which molecules are most likely to be key in the binding process.They experimented with a range of synthesised sugars in the laboratory and found that it is SLeX that specifically binds sperm to an egg.According to the World Health Organisation, infertility affects about 15 percent of reproductive-aged couples around the world and almost one in every seven couples in Britain has problems conceiving a child for various reasons.

来源：资阳报