| Scientist | Key Contributions |
|---|---|
| Antonie van Leeuwenhoek | “Father of microbiology”; first documented observations of bacteria and protozoa (“animalcules”). |
| Louis Pasteur | Disproved spontaneous generation via “swan-neck” flasks; established germ theory and pasteurization. |
| Robert Koch | Formulated “Koch’s postulates” to systematically link specific pathogens to infectious diseases. |
| Alexander Fleming | Discovered penicillin in 1928, marking the beginning of the antibiotic era. |
| Edward Jenner | Invented the smallpox vaccine, leading to the global eradication of the disease. |
| Joseph Lister | Pioneered antiseptic use in surgery, significantly reducing postoperative infections. |
| Hans Christian Gram | Developed the Gram-staining technique for bacterial differentiation. |
| Winogradsky & Beijerinck | Revealed microbial roles in global nutrient cycling (carbon, nitrogen, sulfur cycles). |
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