1. Laboratory of Plant Physiology and Biotechnology, University of Lomé, Lomé, Togo
2. Laboratory of Botany and Plant Ecology, University of Lomé, Lomé, Togo
3. Laboratory of Organic Chemistry and Natural Substances, University of Lomé, Lomé, Togo
4. Department of Geology, National Society of Phosphates of Togo, Lomé, Togo