1. Qingdao Institute of Bioenergy and Bioprocess Technology
2. Chinese Academy of Sciences
3. Qingdao 266101, P.R. China
4. University of Chinese Academy of Sciences
5. Beijing 100049, P. R. China
6. School of Engineering
7. Brown University
8. Providence
9. , USA
10. Department of Physics and Materials Science
11. City University of Hong Kong
12. SAR, Hong Kong