1. Laboratories for Nanoscience and Nanotechnology Research, Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthinilayam, Andhra Pradesh, India.
2. Andhra Med Tech Zone, Hill No. 2, IT Park Madhurwada, Rushikonda, Vishakhapatnam, Andhra Pradesh 530045, India.
3. Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prasanthinilayam, India.
4. Laboratory of Molecular Virology, Center for Biologics Evaluation and Research (CBER), Food and Drug Administration, Silver Spring, MD 20993, USA.