[edited by] Andrew G. Mtewa, Division of Biological Chemistry and Drug Discovery, WCAIR, School of Life Sciences, Dundee University, Dundee, Scotland, Chukwuebuka Egbuna, Department of Biochemistry, Faculty of Natural Sciences, Chukwuemeka Odumegwu Ojukwu University, Nigeria, G.M. Narasimha Rao, Department of botany, Andhra, Visakhapatnam, I, India