National Symposium on Radiation Biology, Kasturba Medical College, Mangalore, India, 11/23/87, 11/25/87, 8th National Conference of the Society of Toxicology, Sukhadia University, Diaper, 11/25/89, 2nd Congress of Toxicology in Developing Countries, New Delhi, India, 11/24/91, 11/28/91, Modern Trends in Technique and Application in Chemistry, Gauhati University, Assam, India, 1994, 1st International Society Biotechnology Conference, Manjitar, Sikkim, 12/28/08, 12/30/08, 5th International Conference on Education and Training in Occupational Health, Cairo, Egypt, 12/06/98, 12/09/98, 19th International Conference on Epidemiology in Occupational Health, University of Alberta, Canada, 10/09/07, 10/12/07, 22nd International Conference on Epidemiology in Occupational Health, Oxford University, UK, 09/07/11, 09/09/11, Nerve Storming from Molecule to Behaviour, Jaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India, 03/08/11, 03/09/11