1. Department of Chemistry, and Sanders-Brown Center on Aging, University of Kentucky, Lexington, Kentucky, U.S.A.
2. Department of Chemistry, University of Kentucky, Lexington, Kentucky, U.S.A.
3. Department of Biochemical Sciences, University of Rome "La Sapienza," Rome, Italy.
4. Department of Chemistry, Sanders-Brown Center on Aging, and Center of Membrane Sciences, University of Kentucky, Lexington, Kentucky, U.S.A.