1. Assistant Professor, Dept. of Soil and Crop Sciences and Dept. of Chemistry, Colorado State Univ., Fort Collins, CO 80523-1170 (corresponding author).
2. Professor, Dept. of Civil Engineering and Center for Biofilm Engineering, Montana State Univ., 366 EPS Building, Bozeman, MT 59717.
3. Instructor, Suffield Academy, 185 North Main St., Suffield, CT 06078.
4. Associate Research Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Health Sciences Building 325 M, P.O. Box 1495, Spokane, WA 99210-1495.
5. Associate Professor, Dept. of Chemical and Biological Engineering and Center for Biofilm Engineering, Montana State Univ., Bozeman, MT 59717.