1. Institute of Materials and Environmental Chemistry; Research Centre for Natural Sciences; Hungarian Academy of Sciences; P. O. Box 286 1519 Budapest Hungary
2. Department of Biology and Biological Engineering; Chalmers University of Technology; Chemical Biology; Kemigården 4 41296 Göteborg Sweden
3. Department of Biophysics and Radiation Biology; Semmelweis University; Tűzoltó u. 37-47 1094 Budapest Hungary
4. Department of Chemistry and Chemical Engineering; Chemistry and Biochemistry; Chalmers University of Technology; Kemigården 4 41296 Göteborg Sweden