Hans Christian Gram

Hans Christian Gram was a Danish microbiologist best known for developing the Gram stain in 1884, a technique used to identify and classify bacteria. The Gram stain differentiates bacteria into two groups—Gram-positive and Gram-negative—based on differences in their cell wall structures, which is crucial for diagnosis and treatment. His work revolutionized microbiology by allowing scientists and doctors to quickly identify bacteria types, guiding more effective treatments for infections. Gram's contributions remain fundamental in medical microbiology today, helping to understand bacterial behavior and antibiotic responses.