"Microbial Biochemistry" covers the principles and importance of microbes, their growth as well as their effects on our environment at large and human health in particular. The description of different layers that enclose the bacterial cytoplasm, and their role in obtaining nutrients from the outside media through different permeability mechanism are described. Fundamentals of the mechanisms by which cells obtain the energy necessary for their growth, glycolysis, the pentose phosphate pathway, etc. have been given in sufficient details. Information related to epidemiology, bacteriology, sterilization and fermentation technology has also been incorporated for those readers who are interested to gain additional knowledge in there areas.