1. Division of Molecular Physics, Department of Physics, Chemistry and Biology, Linköping University, 581 83 Linköping, Sweden, Institut Gilbert Laustriat, University Strasbourg 1, CNRS - UMR 7175, ESBS, Bld Sébastien Brant, BP 10413, 67412 Illkirch, France, Photophysique des Interactions Biomoléculaires, UMR 7175-LC1 du CNRS, Institut Gilbert Laustriat, Faculté de Pharmacie, Université Louis Pasteur, 67401 Illkirch, France, and A. V. Palladin Institute of Biochemistry, Leontovicha 9, Kiev 01030, Ukraine