1. Department of Chemistry and Institute of Materials Science, University of Connecticut, 55 North Eagleville Road, Storrs, Connecticut 06269, Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, Department of Cell Biology, University of Connecticut Health Center, Farmington, Connecticut 06032, and National University of Ireland at Galway, Ireland