1. Department of Chemical Sciences, University of Johannesburg, Johannesburg, South Africa
2. Department of Genetics and Biotechnology, University of Calabar, Calabar, Nigeria
3. Department of Chemistry, Federal University of Technology, Akure Ondo, Nigeria
4. Department of Chemistry, Marquette University, Milwaukee, WI, USA
5. Department of Mathematics, University of Calabar, Calabar, Nigeria
6. Department of Microbiology, University of Calabar, Calabar, Nigeria
7. Department of Biochemistry, Cross River University of Technology, Calabar, Nigeria