* Corresponding authors

^a Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry, India

^b Department of Physics, School of Physical, Chemical & Applied Sciences, Pondicherry University, Puducherry, India

^c UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa

^d Nanosciences African Network (NANOAFNET), Materials Research Group (MRG), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa

^e Clinical Laboratory Sciences Department, College of Applied Medical Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia

^f Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
E-mail: assyed@ksu.edu.sa
Tel: +966-011-4699611