1. Department of Chemistry and Biochemistry; University of California; Los Angeles 3013 Young Dr. East CA 90095-1569 USA
2. Division of Infectious Diseases; Department of Medicine; University of California; Los Angeles CHS 37-121, 10833 Le Conte Ave. CA 90095-1688 USA
3. California NanoSystems Institute; University of California; Los Angeles CA 90095-8352 USA