1. Department of Chemistry, Sri Venkateswara University, Tirupati, Andhra Pradesh, India
2. Division of Molecular Biology, Department of Zoology, Sri Venkateswara University, Tirupati, Andhra Pradesh, India
3. Department of Microbiology, Sri Venkateswara University, Tirupati, Andhra Pradesh, India
4. Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai 400 085, India