1. Centre for Bioengineering and Biotechnology, China University of Petroleum (East China), 66 Changjing West Road, Qingdao Economic Development Zone, Qingdao 266555, China
2. Biological Physics Group, School of Physics and Astronomy, University of Manchester, Sackville Street Building, Sackville Street, Manchester M60 1QD, United Kingdom
3. Department of Chemistry, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand