1. Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 P.R. China
2. School of Engineering; Brown University; Providence RI 02912 USA
3. Qingdao University of Science and Technology; Qingdao 266042 P.R. China
4. Institute of Chemistry; The Hebrew University of Jerusalem; Jerusalem 91904 Israel