Affiliation: | 1. College of Chemistry, Beijing Normal University, No. 19, XinJieKouWai St., HaiDian District, Beijing 100875 (P.R. China), Fax: (+46)?8‐55‐37‐86‐01;2. Department of Physics and Department of Biochemistry and Biophysics, Stockholm University, 106 91 Stockholm (Sweden), Fax: (+46)?8‐55‐37‐86‐01 |