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LOS ANGELES, March 5 (Xinhua) -- Law enforcement agencies are now using smart phones to track and arrest graffiti vandals in Los Angeles, a newspaper report said on Saturday.The graffiti-tracking program, spearheaded by the Tracking and Automated Graffiti Removal System, or TAGRS, allows graffiti- cleaning crews equipped with smart phones to photograph the markings and upload them to a Los Angeles Police Department (LAPD) database, the Los Angeles Times said.The photos are used to gather evidence for prosecution and restitution, the paper quoted city officials as saying.Once the graffiti suspects' identities are discovered, the information is added to the TAGRS database and may eventually uncover incidents involving the same suspects, the paper said.The LAPD launched a pilot project in 2009 in Van Nuys near Los Angeles, modeling its version on one run by the Orange County Sheriff's Department, according to the report.The program is now anchored at four LAPD stations, Van Nuys, Hollenbeck, Central and Harbor, said Mayor Antonio Villaraigosa's spokeswoman Casey Hernandez.Los Angeles spends about 10 million dollars a year cleaning up graffiti, Hernandez said.

SAN FRANCISCO, March 23 (Xinhua) -- Yahoo Inc. on Wednesday introduced a new feature to its search engine, which the company said can deliver answers and direct access to websites before users complete their query or hit the search button.The new feature, called Search Direct, predicts search results as fast as a person types and presents those results dynamically, Yahoo said."With today's launch, direct answers -- not the search results page -- is the primary focus. We are redefining the search process and prominently displaying direct answers where search decisions are being made," Shashi Seth, Yahoo's senior vice president of search and marketplaces, said in a statement."Search Direct is evidence of Yahoo continuing to lead innovation in search, enabling people to take action faster, find what is most important, and sample what is possible with the next stage of search technology," he added.Yahoo announced that Search Direct is rolling out in a public test version to its users across the United States Wednesday, and will be available in other Yahoo products and markets later this year.

BEIJING, March 27 (Xinhua) -- China's search giant Baidu has pledged to remove all unauthorized literary works from its free online literary database Wenku within three days.After receiving requests from copyright owners to remove their works, Baidu has sped up its process of checking for unauthorized items. The unauthorized works were uploaded by Internet users to Wenku without prior approval from the authors, a spokesman for the Chinese search engine giant said in a statement.In the statement issued Saturday, Baidu apologized for what has "hurt the feelings of a certain number of writers" during Wenku's previous stage of operation, according to a report published Sunday by daily newspaper The Beijing News.Baidu said it respects copyright laws and will continue to cooperate with publishers and writers to establish a revenue-sharing model that will ensure that copyright owners receive a share of revenues from online versions of their works.Hailing Baidu's move to remove the unauthorized works, Wang Yefei, deputy head of Beijing Municipal Bureau of Copyrights hopes that Baidu and the publishers should work together to find win-win methods of mutual cooperation, according to the newspaper.However, some writers involved in the copyright row are dissatisfied with remedies Baidu has so far taken.Shen Haobo, CEO of Beijing Motie Book Co. Ltd, one of the six negotiators representing writers in Thursday's negotiations, told the Beijing Youth Daily that Baidu apologized only because of public pressure, but it did not mean to alter its current operation model for Wenku."Without changes in the operation model, the unauthorized works, even if removed now, could be uploaded again sometime later. Besides, it's unacceptable that Baidu reiterated that it had not infringed on our copyright," Shen was quoted as saying.Popular writer and blogger Han Han posted an open letter he wrote to Baidu's CEO Li Yanhong in his blog, indicating that he might take further actions to uphold his rights if Baidu's stance remains unchanged.Baidu's online literary database Wenku is an open platform for online resource sharing. It has been in operation since 2009.More than 40 Chinese writers posted an open letter online on March 15, accusing Baidu of stealing their works and infringing on their copyrights. Baidu's Wenku database was blamed for allowing literary works to become available online without the authors' prior approval.Baidu was asked to make a public apology, compensate for the writers' losses and halt any cases of copyright infringement.

WASHINGTON, May 11 (Xinhua) -- Researchers at Brigham and Women 's Hospital (BWH), a teaching affiliate of Harvard Medical School, have identified a human lung stem cell that is self-renewing and capable of forming and integrating multiple biological structures of the lung. This research will be published Thursday in the New England Journal of Medicine."This research describes, for the first time, a true human lung stem cell. The discovery of this stem cell has the potential to offer those who suffer from chronic lung diseases a totally novel treatment option by regenerating or repairing damaged areas of the lung," said the study's corresponding author Piero Anversa, who is also director of the Center for Regenerative Medicine at the hospital.Using lung tissue from surgical samples, researchers identified and isolated the human lung stem cell and tested the functionality of the stem cell both in vitro and in vivo. Once the stem cell was isolated, researchers demonstrated in vitro that the cell was capable of dividing both into new stem cells and also into cells that would grow into various types of lung tissue. Next, researchers injected the stem cell into mice with damaged lungs. The injected stem cells differentiated into new bronchioles, alveoli and pulmonary vessel cells which not only formed new lung tissue, but also integrated structurally to the existing lung tissue in the mice.The researchers define this cell as truly "stem" because it fulfills the three categories necessary to fall under stem cell categorization: first, the cell renews itself; second, it forms into many different types of lung cells; and third, it is transmissible, meaning that after a mouse was injected with the stem cells and responded by generating new tissue, researchers were then able to isolate the stem cell in the treated mouse, and use that cell in a new mouse with the same results."These are the critical first steps in developing clinical treatments for those with lung disease for which no therapies exist. Further research is needed, but we are excited about the impact this discovery could have on our ability to regenerate or recreate new lung tissues to replace damaged areas of the lungs," said Joseph Loscalzo, chair of the Department of Medicine at BWH and co-author.