1. University of Yaounde I, Advanced Teacher Training College, Laboratory for Simulation and Molecular Biophysics, P.O. Box 47 Yaounde, Cameroon
2. Martin-Luther-Universitat Halle-Wittenberg, Institute for Pharmacy, Wolfgang- Langenbeck-Str. 4, 06120 Halle (Saale), Germany
3. University of Abobo-Adjame, UFR SFA, Laboratoire de Physique Fondamentale et Appliquee 02 BP 801, Abidjan 02, Cote D'Ivoire