1Associate Professor, School of Biotechnology, Vignan University, Vadlamudi, Guntur-522213
2Associate Professor (Retd.), # 8–307, Karnakamma Street, Venkatagiri Town-524132
*Corresponding Author E-mail: drbharathravuru@gmail.com, dr_bsnarayana@yahoo.com
Online published on 29 August, 2014.