1. Department of Polymer Science The University of Akron Akron OH 44325 USA
2. Department of Life Sciences and Chemistry Jacobs University Campus Ring 1 28759 Bremen Germany
3. Department of Chemistry and Biochemistry Northern Illinois University DeKalb Illinois 60115 USA
4. X-ray Science Division Argonne National Laboratory 9700 South Cass Ave. Argonne Illinois 60439 USA