1 Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry 605014, India.
2 Nanosciences African Network (NANOAFNET), Materials Research Group (MRG), iThemba LABS-National Research Foundation (NRF), Old Faure Road, P.O. Box 722, Somerset West 7129, South Africa.
3 Department of Biomedical & Pharmaceutical Sciences, Chapman University, School of Pharmacy, Irvine, CA 92618-1908, USA.
4 Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia.