1. Helmholtz Centre for Environmental Research - UFZ; Permoserstraße 15 Leipzig D-04318 Germany
2. Division of Microbial Ecology, Faculty of Life Sciences; University of Vienna; Vienna Austria
3. Federal Institute for Geosciences and Natural Resources (BGR); Hannover Germany
4. Center for Geomicrobiology; Department of Bioscience; Aarhus University; Aarhus Denmark
5. Department of Microbiology; University of Tennessee; Knoxville TN USA
6. Max Planck Genome Centre Cologne; Cologne Germany