1. Department of Biochemistry, Division of Organic Chemistry, Gülhane Medical Academy (GATA), Ankara, Turkey, Fax: +90‐312‐3043300
2. Department of Engineering Physics, Faculty of Engineering, Ankara University, Ankara, Turkey, Fax: +90‐312‐2127343
3. Department of Chemistry, Hacettepe University, 06532 Ankara, Turkey, Fax: +90‐312‐2992163
4. Department of Chemistry, Marmara University, 34722 Kadıköy, Istanbul, Turkey
5. Department of Chemistry,Technical University of Istanbul, 80626 Maslak, Istanbul, Turkey, Fax: +90 216‐3860824