1. Contribution from the Department of Applied Science, University of California, Davis, California 95616, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Department of Biochemistry, University of Georgia, Athens, Georgia 55455, Department of Chemistry, University of Delaware, Newark, Delaware 19716, Department of Chemistry, University of California, Santa Cruz, California 95064, Department of Chemistry, University of Washington, Seattle, Washington 98195, Department of Chemistry,...