1. Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Cracow, Poland, Tel.: +48815375685, Fax: +48815375685, e-mail: wojtek@vega.umcs.lublin.pl
2. Department of Biopharmacy, Faculty of Pharmacy, Medical University of Lublin, W. Chodzki Str., 4a, 20-093 Lublin, Poland