1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Fachbereich Physik, Philipps Universität Marburg, Marburg 35032, Germany
4. Fachbereich Physik und Chemie, CHyN, Universität Hamburg, Hamburg 20148, Germany
5. Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt
6. Department of Laboratory Medicine (LABMED), Karolinska Institutet, Stockholm 171 77, Sweden