Advances in Microbial Physiology, Volume 83 in this ongoing serial, highlights new advances in the field with this new volume presenting interesting chapters. Each chapter is written by an international board of authors. Topics of interest in this update include RidA paradigm, Targeting the cell envelope to overcome antimicrobial resistance, Biosynthesis and function of microbial methylmenaquinones, Antibiotic efficacy, Role of central metabolism/bacterial physiology on tolerance to cell wall-acting antibiotics, and Physiology of diazotrophs.