1. School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
2. College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, P. R. China
3. Laboratory of Nanobiotechnology, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences (IBPPM RAS), Saratov 410049, Russia