The Department of Chemistry announces the 2002 Sir Derek H.R. Barton Endowed Lecture will be given at 4 p.m. Thursday, April 18, in Room 2104 Chemistry Building. "Regulation of Gene Expression by Synthetic DNA Binding Ligands" will be presented by Professor Peter B. Dervan of the California Institute of Technology. A. Ian Scott, Barton Professor of Chemistry, will be the host of the lecture. Sir Derek H.R. Barton was a member of the chemistry faculty at Texas A&M University until his untimely death in 1998. He was the recipient of the 1969 Nobel Prize in chemistry. This is the third year of the Barton Endowed Lecture.