1. 1Division of Biochemistry, Department of Chemistry University of Poona, Poona 411007, India
2. 2Division of Biophysics, Department of Physics University of Poona, Poona 411007. India
3. 3Physikalische Chemie, Fachbereich 2 - Chemie, Universität Bremen, Postfach 330440, D-2800 Bremen 33, Bundesrepublik Deutschland