1. Department of Chemistry; Faculty of Natural Sciences; Constantine The Philosopher University; SK-949 74; Nitra; Slovakia
2. Institute of Histology and Embryology; Medical Faculty of Comenius University; SK-811 08; Bratislava; Slovakia
3. Faculty of Chemical and Food Technology; Slovak Technical University; SK-812 37; Bratislava; Slovakia
4. Fresh-Lands Environmental Actions; 88 Star Road; Caversham; RG4 5BE; UK