1. Central Research Institute, Dai Nippon Printing Company, Ltd., 250-1 Wakashiba, Kashiwa, Chiba 277, Japan, Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan, and Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855-0909