1. Institute of Microbiology; Academy of Sciences; Opatovický mlýn 37981 Třeboň Czech Republic
2. Faculty of Science; University of South Bohemia; Branišovská 31 370 05 České Budějovice Czech Republic
3. Department of Life Sciences; Sir Ernst Chain Building-Wolfson Laboratories; Imperial College London; South Kensington Campus London SW7 2AZ UK