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JIANGYIN, Jiangsu, July 1 (Xinhua) -- China's manned deep-diving submersible, the Jiaolong, embarked on a journey on Friday during which it will make a 5,000-meter dive in the Pacific Ocean.During the dive, the submersible will undergo several operational tests in which it will take photos, shoot video, survey seabeds and take samples from the ocean floor, according to Jin Jiancai, deputy director of the submersible's diving test program team.The tests will be conducted in the Pacific Ocean in accordance with a contract signed between the China Ocean Mineral Resources Research & Development Association and the International Seabed Authority (ISA).The submersible is scheduled to spend 47 days at sea, according to a statement from the Ministry of Science and Technology.A submersible differs from a submarine, as it typically depends on another vessel or facility for support.The Jiaolong, designed to reach a depth of 7,000 meters, completed 17 dives in the South China Sea between May 31 and July 18 last year, reaching 3,759 meters during its deepest dive.In the year since the submersible's last dive, program team members have made several technical improvements to the submersible and its support vessel, Jin said.Jin said the program team members are "very confident" about the test.He also stressed that the test will be carried out in accordance with the provisions of the United Nations Convention on the Law of the Sea as well as the ISA's rules and regulations.The Jiaolong is the world's first manned submersible designed to reach depths of 7,000 meters below sea level, according to Xu Qinan, the submersible's chief designer.

SAN FRANCISCO, June 13 (Xinhua) -- Google on Monday confirmed that it had signed an agreement to buy Admeld, an on-line advertising optimization firm, in a deal seen as the Internet search giant's latest move to bolster its on-line display ad business.Admeld, launched in 2007 and headquartered in New York City, has developed a service that can help on-line publishers manage their ad space more efficiently and profitably.Admeld now has more than 500 customers worldwide, among them are FOX News, IDG TechNetwork, Discovery and The Weather Channel, according to information posted on its website."By combining Admeld's services, expertise and technology with Google's offerings, we're investing in what we hope will be an improved era of flexible ad management tools for major publishers, " Neal Mohan, Google's vice president of display advertising, said in a blog post announcing the deal."We believe that this investment will be an important step to help on-line publishers, and will further improve and grow the display advertising industry as a whole," Mohan noted.On-line display ads usually appear in forms that consist of images and may be interactive. According to the Interactive Advertising Bureau, a U.S. trade association, display-related on- line ad revenue in the United States totaled nearly 10 billion U.S. dollars in 2010.Financial terms of the deal were not disclosed by the two companies. TechCrunch, a technology blog site, has reported that Google paid around 400 million dollars.

LOS ANGELES, July 18 (Xinhua) -- U.S. scientists have proven that oncogenes can change normal cells into stem-like cells, paving the way to a safer and more practical approach to treating diseases like multiple sclerosis and cancer with stem cell therapy.In a collaborative study, researchers from the Keck School of Medicine of the University of Southern California (USC), and the Children's Hospital of Orange County (CHOC) in California and Good Samaritan Hospital Medical Center in New York have successfully converted human skin cells into brain cells by suppressing the expression of p53, a protein encoded by a widely studied oncogene. This suggests that p53 mutation helps determine cell fate -- good or bad -- rather than only the outcome of cancer.Oncogenes are generally thought to be genes that, when mutated, change healthy cells into cancerous tumor cells.Study findings were appearing Monday on the website of the American Association for the Advancement of Science (AAAS)."The reality may be more complicated than people think," said Jiang F. Zhong, Ph.D., assistant professor of pathology at the Keck School. "What is a stem cell gene? What is a cancer gene? It may be the same thing.""When you turn off p53, people think the cell becomes cancerous because we tend to focus on the bad thing," Zhong said. "Actually, the cell becomes more plastic and could do good things, too. Let's say the cell is like a person who loses his job (the restriction of p53). He could become a criminal or he could find another job and have a positive effect on society. What pushes him one way or the other, we don't know because the environment is very complicated."Stem cells can divide and differentiate into different types of cells in the body. In humans, embryonic stem cells differentiate into three families, or germ layers, of cells. The reasons why and how certain stem cells differentiate into particular layers are not clearly understood. However, from those layers, tissues and organs develop. The endoderm, for example, leads to formation of the stomach, colon and lungs, while the mesoderm forms blood, bone and heart tissue. In its study, Zhong's team examined human skin cells, which are related to brain and neural cells from the ectoderm.When p53 was suppressed, the skin cells developed into cells that looked exactly like human embryonic stem cells. But, unlike other man-made stem cells that are "pluripotent" and can become any other cells in the body, these cells differentiated only into cells from the same germ layer, ectoderm."IPSCs (induced pluripotent stem cells) can turn into anything, so they are hard to control," Zhong said. "Our cells are staying within the ectoderm lineage."Zhong said he expects that suppressing other oncogenes in other families of cells would have the same effect, which could have critical significance for stem cell therapy. Future research should focus on determining which genes to manipulate, Zhong said.The study is slated to appear in the Proceedings of the National Academy of Sciences later this month, according to AAAS.

SAN FRANCISCO, June 15 (Xinhua) -- Facebook has hired Joe Lockhart, who was former U.S. President Bill Clinton's press secretary during the last two years of his second term, as the social network company's vice president of global communications, U.S. media reported on Wednesday.Lockhart, 51, will report to Elliot Schrage, Facebook's current vice president of global communications, marketing and public policy, The Wall Street Journal said in a report."His experience building and running a press office at the White House gives him particular appreciation for the demands of a global 24-hour news cycle and the challenges of responding effectively to intense scrutiny," Schrage said of Lockhart's arrival.Lockhart will start at Facebook on July 15 and will move from Washington D.C. to Facebook's headquarters in California.Lockhart is the latest Washington insider to join Facebook as the world's largest social networking site is facing intense scrutiny for its privacy practices and growing global presence, The Wall Street Journal pointed out.Last year, Facebook also hired White House economic adviser Marne Levine to serve as its vice president of global public policy.More recently, Facebook hired former Bush administration officials Joel Kaplan as its vice president for U.S. public policy, and Myriah Jordan, who will become a policy manager focusing on congressional relations.