1. Department of Plasma Physics and Nuclear Fusion; National Institute for Lasers, Plasma and Radiation Physics; Atomistilor Str. 409 P.O. Box MG-36 Magurele-Bucharest 077125 Romania
2. Faculty of Biology; Department of Systems Ecology and Sustainability; University of Bucharest; Splaiul Independentei 91-95 Bucharest 050095 Romania
3. Faculty of Chemistry; Department of Organic Chemistry, Biochemistry and Catalysis; University of Bucharest; Bd. Regina Elisabeta 4-12 Bucharest 030016 Romania