1. a Department of Biology , Johns Hopkins University , 3400 N. Charles Street, Baltimore, MD, 21218, U.S.A.
2. b Department de Chimie , INP/HB , Yamoussoukro, Yamoussokro, BP 1083, Cote d'Ivoire
3. c Laboratory of Biophysical Chemistry , NHLBI National Institutes of Health , Bldg. 50, Rm 3334, 50 South Drive, Bethesda, MD, U.S.A.
4. d Department of Biology , Johns Hopkins University , 3400 N. Charles Street, Baltimore, MD, 21218, U.S.A.