1. King Abdullah Institute for Nanotechnology, King Saud University; Riyadh 11451 Saudi Arabia
2. Department of Physics and Astronomy, College of Science; King Saud University; Riyadh 11451 Saudi Arabia
3. Department of Zoology, College of Science; King Saud University; Riyadh 11451 Saudi Arabia
4. Department of Agricultural Microbiology, Faculty of Agricultural Sciences; Aligarh Muslim University; Aligarh 202002 India