1. Environmental Microbiology, TU Bergakademie Freiberg, Leipziger Str. 29, 09596 Freiberg, Germany
2. Department of Microbiology, University Stuttgart, Allmandring 31, 70569 Stuttgart, Germany
3. Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands