1. Department of Experimental Physics, Comenius University, Mlynská dolina F2, 842 48 Bratislava, Slovakia
2. Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin 34148-96818, Iran
3. Department of Plant Physiology, Faculty of Natural Sciences, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava 4, Slovakia