1. School of Biological and Chemical Engineering Zhejiang University of Science and Technology Hangzhou 310023 PR China
2. State Key Laboratory Cultivation Base of Natural Gas Conversion Ningxia University Yinchuan 750021 PR China
3. Zhejiang Provincial Key Lab for Chem. & Bio. Processing Technology of Farm Product Hangzhou 310023 PR China
4. Department of Applied Chemistry, School of Engineering University of Toyama Gofuku 3190, Toyama 930-8555 Japan