This book deals about bio-desulfurization of sulfur containing polyaraomatic hydrocarbons(PASH)by Lysinibacillus sphaericus DMT-7 using dibenzothiophene as a model compound.It gives insights into the strategies of isolation & identification of bio-desulfurizing bacteria as well as desulfurizing kinetics.Ample knowledge about optimization of various chemical & physical parameters for maximum bio-desulfurization have been well documented in this book. Association & location of desulfurizing activity(Genes)has also been dealt in detail. This book presents exhaustive literature on bio-desulfurization & adequate explanations of findings well supported by references.