First Author:   Essosinam Franck Karabou University of Kara kfranck2008@gmail.com   Kara, Togo   +228 93 97 39 12(Phone) +228 93 97 39 12(Fax) Second Author: Komlan Ametowoyo Adeve University of Kara fadeve@yahoo.fr   Kara, Togo   +228 90 13 88 57(Phone)