Bioinformatic analysis of gene regulation in <it>Geobacter sulfurreducens</it> by Krushkal Julia, Qu Yanhua, Brown Peter, Sontineni Sreedhar, Ueki Toshiyuki, Juarez Katy, Leang Ching, Merino Enrique, Peeples Jeanette, Barbe Jose F, Adkins Ronald M, Lovley Derek R