1. Department of Chemistry, Acharya Nagarjuna University, Guntur-522510, A. P.,India.
2. Department of Chemistry, Sir C R Reddy College, P G Courses, Eluru, A.P-534007, India.
3. Department of Botany and Microbiology, Acharya Nagarjuna University,Guntur-522510, A.P., India.
4. Department of Chemistry, J. M. J. College for Women, Tenali, Guntur Dist, A.P., India.