1. Department of Inorganic and Analytical Chemistry University of Geneva Quai Ernest-Ansermet 30 1211 Geneva 4 Switzerland
2. Faculty of Biology and Biotechnology, Photobiotechnology Ruhr-Universität Bochum Universitätsstrasse 150 44801 Bochum Germany
3. Department of Physics, Experimental Molecular Biophysics Freie Universität Berlin 10623 Berlin Germany