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LOS ANGELES, March 2 (Xinhua) -- Those who take a nap are more likely to have lower levels of blood pressure despite stress, said a new study in the latest issue of International Journal of Behavioral Medicine available on Wednesday.In the study, researchers at Sarah Conklin of Allegheny College in Meadville, Pennsylvania examined 85 healthy university students, who were divided into two groups, with one group taking an hour- long nap during the day, and the other group having no time to sleep. Both groups were given a mental stress test.The study found that participants in both groups experienced increase in blood pressure and pulse rates when they took the stress test, but the average blood pressure of those who slept for at least 45 minutes was significantly lower after the stress test than it was for those who did not sleep.The researchers drew the conclusion that a daytime nap of at least 45 minutes may help stressed-out people lower their blood pressure and protect their heart."Our findings suggest that daytime sleep may offer cardiovascular benefit by accelerating cardiovascular recovery following mental stressors," the researchers said in the study."Further research is needed to explore the mechanism by which daytime sleep is linked with cardiovascular health and to evaluate daytime sleep as a recuperative and protective practice, especially for individuals with known cardiovascular disease risk and those with suboptimal sleep quality," they added.Sleep deficiency is common in the United States, posing a long- term health threat. On average, Americans get nearly two hours less sleep a night than they did 50 years ago, according to background information provided by the journal.

BEIJING, May 28 (Xinhua) -- The issue of third-party online payment permits in China this week will boost the sector's development through giving it a legal status, analysts said.The People's Bank of China (PBOC), or the central bank, on Thursday announced its first batch of electronic payment licenses to 27 qualified third-party online payment platforms, including Alipay, Tenpay and 99bill.It also stipulated that all the third-party payment businesses should obtain licenses before September, or cease doing business.The move has long been awaited after the central bank said in June last year that non-financial institution payment service would be regulated, and that all businesses involved in the service must get licenses before Sept. 1, 2011.The license covers payment transactions such as Internet payment, mobile phone payment, bank card acquiring service, issuance and accept of prepaid cards and currency exchange.The move provides a legal status for the third-party payment sector so that it can develop in a more standard and healthy way, said Zhang Meng, an analyst with Analysys International, an Internet market information provider.Third-party payment enterprises refer to those non-financial operators who work as the third party between buyers and sellers to provide payment settlement through Internet, telephones or mobile phones.China has the world's highest number of Internet users, with about 457 million netizens, among whom 148 million were active online shoppers as of the end of last year.China's online payment topped 1.09 trillion yuan (167.29 billion U.S. dollars) last year. The figure was 397.3 billion yuan in the first quarter this year, almost doubled year-on-year.99bill CEO Guan Guoguang called the issue of the third-party payment licenses "a milestone" for China's e-payment sector.Requiring that enterprises must be licensed to operate e-payment businesses will help standardize the sector, improve services and boost integration of e-payment and e-commerce, said Guan.The first group of e-payment license holders include Alipay.com Co. Ltd, a unit of Alibaba Group Holding which owns the country's largest e-commerce website Alibaba.com Co. Ltd.; China UMS, a unit of China UnionPay Co. Ltd; Tenpay.com, an e-payment platform developed by Chinese Internet giant Tencent Holdings and Shengfutong, launched by Shanda Interactive Entertainment.Five applicants, however, failed to get licenses.Businesses with licenses will attract more investment and high-end personnel, says iResearch analyst Cheng Shanbao.For those without a license, they will be merged or have to pull out of the sector, according to Yeepay CEO Tang Bin.The central bank selected enterprises that have good management and risk control systems, as well as profit prospects, Zhang Meng said.Mergers are inevitable as the cut-off date of Sept. 1 is approaching, he added.The third-party payment enterprises mainly profit from 1 to 4 percent fees, but analysts believe profits from the fees might be reduced due to fierce competition.

NEW YORK, May 27 (Xinhua) -- U.S. stocks expanded gains on Friday ahead of the long Memorial Day weekend as surging commodity prices overcame disappointing economic data.European Central Bank Governing Council member George Provopoulos said that Greece might deal with its debt problem if it sticks to the aid program. That comment, which was considered as bullish by investors, drove the U.S. dollar weaker and led commodity prices surge on Friday.The stock market was driven by higher commodities prices, with thin trading volume ahead of the Memorial Day holiday, despite somewhat disappointing economic data on Friday.The Commerce Department said that both personal income and spending rose 0.4 percent in April, in line with market estimates. However, the rise in spending was the smallest in three months, suggesting the consumption situation was still weak.Meanwhile, pending home sales dropped 11.6 percent in April. The reading was a seven-month low. The market expectation was a drop of 1 percent.Moreover, the Thomson Reuters/University of Michigan Consumer Sentiment index came in above analysts' estimates. Concerns about higher gas prices and inflation had knocked the gauge down in March and April.Despite those disappointing data, analysts still held a bullish view toward the stock market. "Despite our near-term caution, we continue to see the S&P 500 reaching 1400 over the coming year," Alec Young, equity strategist of S&P Equity Research told Xinhua.According to Alex, while recent macro headwinds were raising questions about the sustainability of recent earnings momentum, he still believed that a downside trend of market was fairly limited and that the current weakness is more likely to be a correction, rather than the beginning of a new bear market."In our view, 2011 estimated EPS would have to be excessively optimistic to justify a bear market,"he added.The Dow Jones industrial average added 38.82 points, or 0.31 percent, to 12,441.58. The Standard & Poor's 500 was up 5.41 points, or 0.41 percent, to 1,331.10. The Nasdaq Composite Index rose 13.94 points, or 0.50 percent, to 2,796.86.

LOS ANGELES, April 6 (Xinhua) -- Freeze-dried strawberries may play a role in the prevention of esophageal cancer, a new study suggests."Strawberries may be an alternative or work together with other chemopreventive drugs for the prevention of esophageal cancer," said lead researcher Tong Chen, M.D., Ph.D., assistant professor, division of medical oncology, department of internal medicine at the Ohio State University.Study findings were presented at the ongoing 102nd annual meeting of the American Association for Cancer Research (AACR) in Orlando, Florida, according to the American Association for the Advancement of Science (AAAS) on Wednesday."We concluded from this study that six months of eating strawberries is safe and easy to consume. In addition, our preliminary data suggests that strawberries can decrease histological grade of precancerous lesions and reduce cancer- related molecular events," said Chen, who is also a member of the Molecular Carcinogenesis and Chemoprevention Program in the Ohio State University Comprehensive Cancer Center.The study involved a group of participants who consumed 60 grams of freeze-dried strawberries daily for six months and completed a dietary diary chronicling their strawberry consumption.The researchers obtained biopsy specimens before and after strawberry consumption. The results showed that 29 out of 36 participants experienced a decrease in histological grade of the precancerous lesions during the study.Using freeze-dried strawberries was important because by removing the water from the berries, they concentrated the preventive substances by nearly 10-fold, Chen said.Esophageal cancer is the third most common gastrointestinal cancer and the sixth most frequent cause of cancer death in the world, she noted.Chen and her team are studying esophageal squamous cell carcinoma (SCC) which makes up 95 percent of cases of esophageal cancer worldwide. China, where this study took place, has the highest incidence of esophageal SCC, according to the AAAS.In a previous study, Chen and colleagues found that freeze- dried strawberries significantly inhibited tumor development in the esophagus of rats. Based on these results, they embarked on a Phase Ib trial that included participants with esophageal precancerous lesions who were at high risk for esophageal cancer."Our study is important because it shows that strawberries may slow the progression of precancerous lesion in the esophagus," Chen said.But she said they need to test this in randomized placebo- controlled trials in the future.

NEW YORK, March 9 (Xinhua) -- The U.S. stocks dropped on Wednesday, the two-year anniversary of the beginning of a bull market, as concerns of oil prices and Middle East unrest continued to weigh on investors' minds.U.S. crude oil price dipped on Wednesday as crude inventories rose more than expected, though Brent crude rose on fears caused by continued violence in Libya.Meanwhile, Rex Tillerson, the CEO of energy giant Exxon Mobil Corp., said on Wednesday that he didn't think the recent jump in oil prices was hurting the U.S. economy just yet, but it's getting close.The market was worrying that the surging oil prices would hurt global economic recovery. Adding to those concerns, the Portuguese government's two-year cost of borrowing hit the highest level since it joined the eurozone in a bond auction on Wednesday.Wednesday marked the two-year anniversary of the beginning of a bull market. On March 9, 2009, the Dow Jones Industrial Average closed at 6,547 and the Standard & Poor's 500 Index closed at 677. The Dow is back above 12,000 now and the S&P 500 index has almost doubled.Meanwhile, the wholesale report was slightly positive, but still failed to boost the market. According to the U.S. Commerce Department, the wholesale inventories climbed 1.1 percent in January. Sales at the wholesale level rose 3.4 percent, the largest gain since November 2009.Economists expected that as businesses kept expanding, demands for products would continue to grow. And larger sales may also encourage businesses to keep restocking their shelves and boost factory production.According to the report, a 10.6-percent rise in demand for petroleum helped lift sales, reflecting higher oil and gas prices.While some investors were concerned that surging oil prices might have a negative impact on economy, some others believed the boost in sales and inventories in January hinted that the economy could withstand the impact.The Dow Jones industrial average lost 1.29 points, or 0.01 percent, to 12,213.09. The Standard & Poor's 500 Index was down 1. 80 points, or 0.14 percent, to 1,320.02. The Nasdaq declined 14.05 points, or 0.51 percent, to 2,751.72.