1. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao 266101, P. R. China
2. Sino-Danish College, University of Chinese Academy of Sciences, No. 380 Huaibeizhuang, Huairou district, Beijing 101408, P. R. China
3. Sino-Danish Centre for Education and Research, Beijing 100190, P. R. China
4. Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, P. R. China