1. Sevastopol National Technical University, Department of Physics, 33 Universitetskaya Str., Sevastopol 99053 Ukraine
2. Belgorod State University, Department of Biology and Chemistry, 85 Pobedy Str., Belgorod 308015 Russia
3. Institute of Physics of NAS of Ukraine, Department of Physics of Biological Systems, 46 Nauki Ave., Kiev 03028 Ukraine
4. Technical Centre of NAS of Ukraine, 13 Pokrovskaya Str., Kiev 04070 Ukraine