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WASHINGTON, May 11 (Xinhua) -- Johns Hopkins University researchers have demonstrated that human liver cells derived from adult cells coaxed into an embryonic state can engraft and begin regenerating liver tissue in mice with chronic liver damage.The work, published Wednesday in the journal Science Translational Medicine, suggests that liver cells derived from so- called "induced-pluripotent stem cells (iPSCs)" could one day be used as an alternative to liver transplant in patients with serious liver diseases, bypassing long waiting lists for organs and concerns about immune system rejection of donated tissue."Our findings provide a foundation for producing functional liver cells for patients who suffer liver diseases and are in need of transplantation," says Yoon-Young Jang, assistant professor of oncology at the Johns Hopkins Kimmel Cancer Center. "iPSC-derived liver cells not only can be generated in large amounts, but also can be tailored to each patient, preventing immune-rejection problems associated with liver transplants from unmatched donors or embryonic stem cells." A microsopic view shows human embryonic stem cells in various stages of differentiation into liver cells in this photo taken at Stanford University and released by the California Institute for Regenerative Medicine, March 9, 2009iPSCs are made from adult cells that have been genetically reprogrammed to revert to an embryonic stem cell-like state, with the ability to transform into different cell types. Human iPSCs can be generated from various tissues, including skin, blood and liver cells.Although the liver can regenerate in the body, end-stage liver failure caused by diseases like cirrhosis and cancers eventually destroy the liver's regenerative ability, Jang says. Currently, the only option for those patients is to receive a liver organ or liver cell transplant, a supply problem given the severe shortage of donor liver tissue for transplantation. In addition, mature liver cells and adult liver stem cells are difficult to isolate or grow in the laboratory, she says. By contrast, iPSCs can be made from a tiny amount of many kinds of tissue; and the embryonic stem- like iPSCs can grow in laboratory cultures indefinitely.For the study, Jang and colleagues generated human iPSCs from a variety of adult human cells, including liver cells, fibroblasts ( connective tissue cells), bone marrow stem cells and skin cells. They found that though the iPSCs overall were molecularly similar to each other and to embryonic stem cells, they retained a distinct molecular "signature" inherited from the cell of origin.

PYONGYANG, Feb. 14 (Xinhua) -- Kim Yong Nam, president of the Presidium of the Supreme People's Assembly of the Democratic People's Republic of Korea (DPRK), met Chinese Minister of Public Security Meng Jianzhu here on Monday.Kim said it was the consistent stand of the Worker's Party of Korea (WPK) and the government and the firm will of the people to develop the traditional DPRK-China friendship generation after generation.The DPRK is sincerely happy to see the great achievement China has made and wish that the Chinese people make even more progress, Kim said.Meng, also a State Councilor, said the traditional friendship between the two neighboring countries has strengthened through the ages. He expressed his expectations of inheriting the friendship, deepening communications and cooperation in various areas and promoting the China-DPRK friendship.Ri Yong Ho, Presidium of Political Bureau of Central Committee of WPK and chief of the Korean People's Army General Staff, also met Meng on the same day.Ju Sang Song, a member of the Political Bureau of Central Committee of the WPK and Minister of People's Security, met Meng on Sunday. The two achieved consensus on making more efforts to develop cooperation and communications on public security to make active contributions to the traditional China-DPRK friendship. An agreement on cooperation between the the two security ministries was signed after the meeting.Meng arrived at Pyongyang on Sunday at the invitation of Ju Sang Song.

JERUSALEM, May 8 (Xinhua) -- Israeli researcher Jacob (Koby) Scheuer, from the Tel Aviv University (TAU) School of Electrical Engineering, has developed a nano-scale gyroscope, the Ha'aretz daily reported Sunday.Scheuer developed a new optic-fiber nano-sensor four years ago, along with an optic gyroscope that works in conjunction with the sensor. As he developed the devices, it occurred to him that his discovery could be harnessed to surgical needs, virtual reality, or communications, said the report."What we developed here is an optic gyroscope," Scheuer told Xinhua in a recent interview on Sunday, "like the others, but the breakthrough is that we found a way to measure rotation in a very, very small device using the optic sensor."Optic gyroscopes emit light when they rotate, and change its wavelength when there is any change in the speed of rotation, making it possible to measure velocity and position by the differences in light.Scheuer's gyroscope, however, is so small in comparison to the others commonly used in planes, trains and vehicles, that it can be used in cell phones or watches and does not need satellite connection like the ubiquitous Global Positioning System.The applications of this gyroscope and optic sensor are almost endless, as Scheuer puts it."It can be a pill that you swallow and can move through your body to take pictures or release drugs in a localized area," the researcher explained, "or it can be used by a doctor to operate on a patient who is thousands of kilometers away.""Our gyroscope has complete independent navigation capability, which the others don't have," he stressed.Though the new optic gyroscope works in theory, it still hasn't been tried in out in reality. "It will take some time until we can empirically demonstrate our work, I would say about three to five years," Scheuer added.Alongside the gyroscope, Scheuer continues to work on the optic sensor, whose applications can also be found in security, such as an information security system developed by Scheuer to safeguard online information that acts as a key bearer."When both parties have 'the key' it's virtually impossible to hack the information sent," Scheuer noted, terming the development as a "total paradigm change."

CAIRO, Jan. 23 (Xinhua) -- As part of bilateral efforts to enhance cultural cooperation between the two great civilizations, China, as the Guest of Honor, will participate in the 43rd Cairo International Book Fair in Egypt."An outstanding Chinese delegation will attend the fair to inform the Egyptian people all about Chinese culture," said Chen Dongyun, cultural counsellor of the Chinese Embassy in Egypt.Some 248 publishers, 13 renowned scholars, writers and artists will display about 10,000 books about the achievements made by China in various fields such as politics, economy, science and technology, and culture.The fair, the most important of its kind in the Arab region, will be held on Jan. 29 through Feb. 8 in the Cairo International Conference Center. The annual fair began in 1969.The Chinese hall in the center covers an area of 1,400 square meters, with special areas allocated for a variety of exhibitions about the history of the evolution of Chinese characters, photos reflecting Sino-Egypt friendship and landscape of modern China and intangible cultural heritage.The fair also includes a seminar featuring literature and translation among Chinese and Egyptian writers and artists and a week-long film show in which six Chinese films with Arabic subtitles will be introduced to the audience.Chinese participation reflected the common consensus of the leaders of the two countries to deepen mutual understanding and friendship and will serve to promote the sound and sustainable development of bilateral relations, Chen said.Zhang Jichen, vice president of China National Publications Import and Export (Group) Corporation, which is in charge of the organization of the Chinese activities at the fair, said a cooperation agreement between the General Administration of Press and Publication of China and Egypt's Ministry of Culture.China will also present some 1,000 high-quality books to the National Library and Archives of Egypt and the Alexandria Library.The fair is expected to attract 632 publishers from 29 countries, including 17 in the Middle East. More than two million visitors participate in the fair each year.

BEIJING, March 21 (Xinhuanet) -- A new device is being developed by American engineers to ease pain of blood sugar testing in diabetics, according to foreign media report last week.The upcoming device is the research target of a team of engineers at Arizona State University. It is specifically designed for patients with type1diabetes and type2 diabetes, according to a report in the "Journal of Diabetes Science and Technology,"  The traditional method of testing blood sugar levels involves painful pricks on the fingers to draw blood for testing. The inconvenient and painful process may somehow leave diabetics lax in their testing. The blood sugar levels, when poorly controlled, are very likely to trigger complications including heart disease, kidney disease and retinopathy.Unlike the old testing method, the new device could help people keep track of their blood sugar levels without the need to break the skin. It draws tears to measures the blood sugar levels in the fluid and gives just an accurate reading of blood sugar levels. "This new technology might encourage patients to check their blood sugars more often, which could lead to better control of their diabetes by a simple touch to the eye." said Jeffrey T. LaBelle, developer of the device.The new testing device has drawn great interest from investors due to its promising prospects. However, it still awaits a significant amount of testing before it can hit the market.