Jianguo Liu1*, Zhiqiang Zhang1, Hongyue Dang1, Jianren Lu2 and Zhanfeng Cui3
1Center for Bioengineering and Biotechnology, China University of Petroleum (East China), Qingdao 266555, People’s Republic of China.
2School of Physics, Manchester University, Manchester M60 1QD, UK.
3Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK.
