Mercury based drug in ancient India: The red sulfide of mercury in nanoscale oleh Priyabrata Mukhi, Swapna Sarita Mohapatra, M. Bhattacharjee, K.K. Ray, T.S. Muraleedharan, A. Arun, R. Sathyavathi, R.R. Juluri, P.V. Satyam, Alok K. Panda, Ashis Biswas, S. Nayak, Sreedhar Bojja, S. Pratihar, Sujit Roy