1. Institute of Physics, Faculty of Mathematics and Physics; Charles University in Prague; Ke Karlovu 5 CZ-12116 Prague 2 Czech Republic
2. Center for Nanobiology and Structural Biology, Institute of Microbiology; Academy of Sciences of the Czech Republic; Zámek 136 CZ-37333 Nové Hrady Czech Republic
3. Faculty of Sciences; University of South Bohemia; Zámek 136 CZ-37333 Nové Hrady Czech Republic
4. Institute of Microbiology; Academy of Sciences of the Czech Republic; Vídeňská 1083 CZ-142 20 Prague 4 Czech Republic