1. Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky Str. 9-11, D-26111 Oldenburg, Germany
2. Max Planck Institute for Marine Microbiology, Celsiusstraße 1, D-28359 Bremen, Germany
3. Bruker Daltonik GmbH, Fahrenheitstr. 4, D-28359 Bremen, Germany
4. Laboratory for General Microbiology, University Bremen, PO Box 330440, D-28334 Bremen, Germany
5. Department for Applied Microbiology, Justus Liebig University, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany