1. Department of Microbiology, University of Tennessee, Knoxville, Tennessee, USA.
2. FH Aachen - Campus Jülich, Institute of Bioengineering, Julich, Nordrhein-Westfalen, Germany.
3. RWTH Aachen University, Aachen, North Rhine-Westfalia, Germany.
4. Northern Arizona University, Flagstaff, Arizona, USA.
5. University of Bremen, Bremen, Germany.
6. The Ohio State University, Byrd Polar Research Center, Columbus, Ohio, USA.
7. University of California Santa Cruz, Santa Cruz, California, USA.