1. Center for Free Radical and Antioxidant Health and Department of Environmental and Occupational Health, University of Pittsburgh, 100 Technology Drive, Suite 350, Pittsburgh, Pennsylvania 15219-3130, Department of Medical Biophysics, Faculty of Fundamental Medicine, Moscow State Lomonosov University, 31/5 Lomonosovsky Avenue, Moscow 119192, Russia, and Department of Biophysics, Medical-Biological Faculty, Russian State Medical University, 1 Ostrovitjanova Street, Moscow 117997, Russia