This Springer Prools manual is a practical guide to the application of key molecular biology techniques in microbiological research. The focus is on experimental prools, which are presented in an easy-to-follow way, as step-by-step procedures for direct use in the laboratory. Notes on how to successfully apply the procedures are included, as well as recommendations regarding materials and suppliers. In addition to the practical prools, important background information and representative results of experiments using the described methods are presented. Researchers in all areas applying microbial systems, such as in molecular biology, genetics, pathology, and agricultural research will find this work of great value.