1. Biosciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4843, Environmental Sciences Division, Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, Tennessee 37831, Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-4020, Microbiology and Molecular Genetics, Michigan State University, 2215 Biomedical Physical Sciences, East Lansing, Michigan 48824-4320, Environmental Engineering Research Centre, School of...