1. Faculty of Science, Department of Inorganic Chemistry, P.J. Šafárik University, Košice, Slovak Republic
2. Faculty of Science, Deparment of Biochemistry, P.J. Šafárik University, Košice, Slovak Republic
3. Department of Biochemistry and Microbiology, Slovak University of Technology, Bratislava, Slovak Republic
4. Faculty of Science, Department of Organic Chemistry, P.J. Šafárik University, Košice, Slovak Republic