This book include development of Bioethanol production theoretically and practically, designing mutants for modifying and altering the cofactor coefficient of xylose reductase gene. cloning the genes,study the effect of protein engineering, enzyme activities, kinetic parameters,fermentation of recombinant Saccharomyces serevisae and Innovative strategies for bioethanol production in addtion to, Pretreatment and hydrolysis of lignocellulosic biomass