1. Department of Physics, Syracuse University, 201 Physics Building, Syracuse, New York 13244-1130, Cornell Center for Materials Research, Cornell University, 627 Clark Hall of Science, Ithaca, New York 14853, Structural Biology, Biochemistry, and Biophysics Program, Syracuse University, 111 College Place, Syracuse, New York 13244-4100, and Syracuse Biomaterials Institute, Syracuse University, 121 Link Hall, Syracuse, New York 13244