1. Department of Chemical and Biomolecular Engineering; College of Engineering; The Ohio State University; Columbus OH 43210 USA
2. Division of Molecular Pharmaceutics; Eshelman School of Pharmacy; University of North Carolina; Chapel Hill NC 27599 USA
3. Vaccine and Medical Countermeasures Department; Biological Defense Research Directorate; Naval Medical Research Center; Fort Detrick MD 20910 USA
4. Department of Chemistry and Biochemistry; College of Arts and Sciences; The Ohio State University; Columbus OH 43210 USA