1. Los Alamos National Laboratory, Bioscience Division, Michelson Resource, Mail Stop J586, Los Alamos, New Mexico 87545, School of Chemical Sciences, University of Illinois, 600 South Mathews Street, Urbana, Illinois 61808, Department of Chemistry, James Madison University, 800 South Main Street, Harrisonburg, Virginia 22807, and Helsinki Bioenergetics Group, Institute of Biotechnology, P.B. 56, University of Helsinki, FI-00014, Finland