The term biotechnology is a fusion of biology and technology. The area is multidisciplinary, vast and highly divergent, which has made precise definition of the subject rather difficult, it is a basically the controlled use of biological agents, such as micro-organisms or cellular components for human beneficial use.This book entitled �Biotechnology for Human welfare� consists of 34 chapters. The chapters are mainly focused on the newer technological aspects in molecular biology, bioremediation, toxicology etc.,The authors have put an effort to explain each and every point in the procedures. This book has been brought to the society, keeping in mind students of graduate and post graduate, research scholars and teaching faculty.