Advances in Microbial Physiology, Volume 71, continues the long tradition of topical, important, cutting-edge reviews in microbiology. The book contains updates in the field, with comprehensive chapters covering The Microbiology of Ruthenium Complexes, The role of plant growth-promoting bacteria in metal phytoremediation, the Mechanism and Role of Globin Coupled Sensor Signaling, Cytochrome bd and gaseous ligands in bacterial physiology, and Haem-Based Sensors of O2: Lessons and Perspectives.