Abstract
1Biochemicals Division, Mitsubishi Gas Chemical Co., Seavans-N Building, 1-2-1, Shibaura, Minato-ku, Tokyo 105, Japan
2Niigata Research Laboratory, Mitsubishi Gas Chemical Co., Niigata 950-31, Japan
3Japan Collection of Microorganisms, The Institute of Physical and Chemical Research, Wacho-shi, Saitama 351-01, Japan
4Institute of Applied Microbiology. The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan