1. Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Jackson State University, Jackson, MS 39217 (USA), Fax: (+1) 601‐9797823
2. Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50‐370 Wroclaw (Poland), Fax: (+48) 713203364