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发布时间: 2025-05-31 23:18:08北京青年报社官方账号
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PARIS, June 14 (Xinhua) -- Solar Impulse, a Swiss solar-powered aircraft, finally arrived in Paris on Tuesday after three days' delay, ready for a debut at the biennial International Paris Air Show.The 1.6-ton solar-powered plane was expected to land in Paris on Saturday but technical problems and bad weather forced it to turn back to Brussels.The plane took its first international flight from Switzerland to Brussels on May 13 and then marked its second international flight to Paris. It has 12,000 solar cells mounted on the wings, which provide momentum for its four electric motors.Solar Impulse is the first aeroplane designed to fly day and night without requiring fuel and without producing carbon emission. The 64-meter-wingspan (as wide as an Airbus A340) can fly at extremely slow speed and has a weight equivalent to that of an average family car.Regarded as a "special guest" in the show, Solar Impulse made a historic 26-hour day and night flight without fuel in July 2010.During the Paris air show from 20 to 26 June, visitors can enjoy a close look at the innovative plane on ground every day and if weather condition permits, flying displays will take place.According to Paris Air Show organizers, 59 of the top 100 companies in the air industry worldwide will be present. More than 1,800 small and medium-sized companies will be exhibiting their products during the one-week show. Enditem

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WASHINGTON, June 16 (Xinhua) -- Cells in the human body are constantly being exposed to stress from environmental chemicals or errors in routine cellular processes. While stress can cause damage, it can also provide the stimulus for undoing the damage. New research by a team of scientists at the University of Rochester has unveiled an important new mechanism that allows cells to recognize when they are under stress and prime the DNA repair machinery to respond to the threat of damage.Their findings will be published Friday in journal Science. Cells in the human body are constantly being exposed to stress from environmental chemicals or errors in routine cellular processes. While stress can cause damage, it can also provide the stimulus for undoing the damage.The scientists, led by biologists Vera Gorbunova and Andrei Seluanov, focused on the most dangerous type of DNA damage -- double strand breaks. Unrepaired, this type of damage can lead to premature aging and cancer. They studied how oxidative stress affects efficiency of DNA repair. Oxidative stress occurs when the body is unable to neutralize the highly-reactive molecules, which are typically produced during routine cellular activities.The research team found that human cells undergoing oxidative stress synthesized more of a protein called SIRT6. By increasing SIRT6 levels, cells were able to stimulate their ability to repair double strand breaks. When the cells were treated with a drug that inactivated SIRT6, DNA repair came to a halt, thus confirming the role of SIRT6 in DNA repair. Gorbunova notes that the SIRT6 protein is structurally related to another protein, SIR2, which has been shown to extend lifespan in multiple model organisms."SIRT6 also affects DNA repair when there is no oxidative stress," explains Gorbunova. "It's just that the effect is magnified when the cells are challenged with even small amounts of oxidative stress."SIRT6 allows the cells to be economical with their resources, priming the repair enzymes only when there is damage that needs to be repaired. Thus SIRT6 may be a master regulator that coordinates stress and DNA repair activities, according to Gorbunova.

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CANBERRA, Sept. 1 (Xinhua) -- Bushranger Ned Kelly's headless body has finally been identified in Australia, more than 130 years after his execution in the Old Melbourne Gaol, Victoria's Attorney- General Robert Clark announced on Thursday.Clark said the bushranger's remains have been identified by doctors and scientists at the Victorian Institute of Forensic Medicine (VIFM).Kelly was an Irish Australian bushranger, considered by some merely a cold-blooded killer, while by others a folk hero and symbol of Irish Australian resistance against oppression by the British ruling class for his defiance of the colonial authorities. He was hanged for murder in 1880 at Old Melbourne Gaol. His daring and notoriety made him an iconic figure in Australian history, folklore, literature, art and film.The project involved collaboration with the ancient DNA laboratory EAAF in Argentina, which has worked with the VIFM on other forensic projects.Clark said "This is an extraordinary achievement by our forensic team here in Victoria," he told reporters in Melbourne on Thursday."To think a group of scientists could identify the body of a man who was executed more than 130 years ago, moved and buried in a haphazard fashion among 33 other prisoners, most of whom are not identified, is amazing." The investigation started when a skull believed to belong to Kelly was handed to the VIFM on Nov. 11, 2009.The skull handed in in 2009 was found not to be that of Ned Kelly, and Glenrowan historian Gary Deans said the next step is to find Kelly's skull."The Government should put a request in the public arena for the return of Ned Kelly's skull," he told ABC News."We know thanks to Jack Cranston, who held the skull around 1929, that it was sitting on a detective's desk. This was around the same time that remains were dug up in the Old Melbourne Gaol."I imagine that that detective or somebody else took it home."

  

NEW YORK, July 15 (Xinhua) -- A Gallup survey released on Friday found a total of 59 percent of Americans support a ban on smoking in all public places.The July 7-10 survey among 1,016 national adults showed a change in the public's attitude toward public smoking ban. In 2001, when Gallup first asked about a ban on public smoking, 39 percent were in favor, an attitude that stayed roughly the same through 2007.At the same time, the poll also found that fewer than two in 10 people supported the idea of making smoking totally illegal.According to the American Lung Association, 27 states plus the District of Columbia have passed comprehensive smoke-free laws. A New York City law bans smoking in virtually all public places, including outdoor plazas and beaches.

  

SAN FRANCISCO, July 19 (Xinhua) -- Apple Inc. on Tuesday reported strong third fiscal quarter results that top analysts' expectations, citing strong iPhone and iPad sales.For its fiscal 2011 third quarter ended on June 25, Apple reported net income of 7.31 billion U.S. dollars or 7.79 dollars per share, compared with 3.25 billion dollars, or 3.51 dollars per share a year ago.Its revenue reached 28.57 billion dollars, compared with 15.7 billion dollars in the same period a year earlier. International sales accounted for 62 percent of the quarter's revenue.The average estimate is a profit of 5.84 dollars a share on revenue of 24.9 billion dollars.The Cupertino, Califronia-based company sold 20.34 million iPhones in the quarter, representing 142 percent unit growth over the year-ago quarter. It sold 9.25 million iPads in the third quarter, a 183 percent unit increase on a year-over-year basis.The only drawback is the sales of iPods, which had a 20 percent unit decline to 7.54 million from the year-ago quarter."We're thrilled to deliver our best quarter ever, with revenue up 82 percent and profits up 125 percent," Steve Jobs, Apple's chief executive officer, said in a statement."Right now, we're very focused and excited about bringing iOS 5 and iCloud to our users this Fall," added Job.It is the first time since 2008 that Apple's third-quarter earnings does not include the release of a new iPhone, which, slated for launch in September, is reportedly to be thinner and lighter with a faster chip and 8-megapixel camera.Apple has enjoyed double-digit year-over-year percentage revenue growth for the past four quarters. It had previously beaten the average earning projection for at least 29 straight quarters, according to data compiled by Bloomberg.For the fourth fiscal quarter of 2011, Apple's chief financial officer Peter Oppenheimer said the company expects revenue of 25 billion dollars and earnings per share of about 5.5 dollars. Apple has been known for its conservative projections of earnings.Apple has been operating without the daily attention of Jobs since the CEO took a medical leave this January. The Wall Street Journal reported Tuesday that some members of Apple's board have discussed CEO succession with executive recruiters and at least one head of a high-profile technology company.But the people familiar with the matter told the newspaper that it was more of an informal exploration of the company's options and don't appear to have been acting on behalf of the full board.Meanwhile, Apple has recently been busy with a number of legal battles over patent rights with HTC, Eastman Kodak and Samsung.Last week, the U.S. International Trade Commission made an initial ruling that HTC infringed two of Apple's phone patents in its smartphones powered by Google's Android operating system.If upheld, the ruling could let Apple force other Android phone makers to pay significant patent fees.On Tuesday, Google's executive chairman Eric Schmidt said at a conference in Tokyo that Apple's smartphone lawsuits are inspired by jealousy and a lack of innovation in iPhone, noting Google would support HTC's fight against Apple and was confident of a win.

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