Shete Sonal Dhananjay Production of Cerium Sulfide Pigment using E Coli Expressing Recombinant DSR Genes : A Thesis submitted to the University of Pune for the degree of Ph D in Microbiology Under the Guidance of Dr Dhakephalkar PK - Agharkar Res Inst, Pune, Pune 2013 Dewey Class. No.: G91/P13/