Barry Sharpless of the United States, the 2001 winner of the Nobel Prizer in chemistry, delivers a speech during the 13th International Biotechnology Symposium and Exhibition on Oct. 13, 2008 in Dalian, northeast China's Liaoning Province. Prestigious specialists in this field from over 80 countries and regions took part in the symposium. (Xinhua/Wang Xizeng) Photo Gallery>>>