1. NSF I/UCRC for Biocatalysis and Bioprocessing of Macromolecules, Polytechnic University, 6 Metrotech Center, Brooklyn, New York 11201, Rohm and Haas Co., P.O. Box 904, Spring House, Pennsylvania 19477, and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973