1. Microbiology
and Biotechnology Division, Department of Food and Environmental Sciences, University of Helsinki, P.O. Box 56, Viikki Biocenter, Viikinkaari 9, Helsinki FIN-00014, Finland
2. Institute
of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany
3. Institute
of Chemistry, Technical University Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany