1. Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
2. Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
3. Biomedical Center and Department of Microbiology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Plzen, Czech Republic
4. Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic