Affiliation: | a Chemistry Department, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa b Gebze Institute of Technology, Department of Chemistry, P.O. Box: 141, 41400 Gebze-Kocaeli, Turkey c Biochemistry, Microbiology and Biotechnology Department, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa |