1. Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary, Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, Department of Basic Medical Sciences, Biochemistry Section, University of West Indies, Mona Campus, Kingston 7, Jamaica, West Indies, and Department of Biochemistry, SUNY at Buffalo School of Medicine and Biomedical Sciences, 140 Farber Hall, Buffalo, New York 14214