1. Department of Chemistry, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic, Central European Institute of Technology, National Centre for Biomolecular Research and Department of Biochemistry, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic, Institute of Physics of the ASCR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic, and Research Centre for Toxic Compounds in the Environment, Masaryk University, Kamenice 3, 625 00 Brno, Czech Republic