1. Department of Pure and Applied Biology, Ladoke Akintola University of Technology, Ogbomoso, Nigeria;
2. Microscopy and Microanalysis Unit, School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa;
3. Department of Microbiology, School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa