[1] Univ Vienna, Inst Okol & Naturschutz, Dept Mikrobielle Okol, A-1090 Vienna, Austria
[2] Russian Acad Sci, Inst Mol Genet, Moscow, Russia
[3] Max Planck Inst Biochem, D-82152 Martinsried, Germany
[4] Tech Univ Munich, Dept Microbiol, D-8050 Freising Weihenstephan, Germany
[5] Max Planck Inst Terr Microbiol, D-35043 Marburg, Germany
[6] Univ Washington, Dept Civil & Environm Engn, Seattle, WA 98195 USA