1. Department of Microbiology and Plant Pathology; University of Pretoria; Pretoria South Africa
2. Department of Physics; University of Pretoria; Pretoria South Africa
3. CNRS/CEA/Aix-Marseille Université; UMR7265 Biosciences and Biotechnologies Institute; Laboratoire de Bioénergétique Cellulaire; Saint Paul lez Durance France