Gram-negative bacteriology is the academic and research field dedicated to the comprehensive study of bacteria characterized by a gram-negative staining reaction. This discipline investigates the diverse biology, cellular structure (particularly the outer membrane and lipopolysaccharide), genetics, physiology, and molecular mechanisms of these organisms. Its significance lies in understanding their crucial roles across various domains, including their impact as human and animal pathogens, their mechanisms of antibiotic resistance, and their ecological functions.