1. Chemical
Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
2. Biosciences
Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
3. Department
of Biology, James Madison University, Harrisonburg, Virginia 22807, United States
4. Department
of Microbiology, University of Tennessee, Knoxville, Tennessee 37996, United States