1. Department of Physics, Thanthai Periyar EVR Government Polytechnic College, Vellore, Tamil Nadu, India
2. Department of Physics, Thanthai Periyar Government Institute of Technology, Vellore, Tamil Nadu, India
3. Department of Microbiology, School of Allied Health Sciences, VIMS Campus, Vinayaka Missions Research Foundation (Deemed University), Salem, Tamil Nadu, India