1. Institute of Physics, Otto von Guericke University, Magdeburg, Germany
2. Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand
3. Department of General Science, Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon, Thailand
4. Department of Biophysics, Faculty of Biology, Moscow State University, Moscow, Russia