1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, P.R. China
2. University of Chinese Academy of Sciences, Beijing, P. R. China
3. Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI, USA
4. Linus Pauling Institute, Oregon State University, Corvallis, OR, USA