1. Department of Microbiology, Montana State University, Bozeman, Montana, USA
2. Center for Biofilm Engineering, Montana State University, Bozeman, Montana, USA
3. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
4. Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
5. Department of Bioengineering, University of California, Berkeley, California, USA