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# Three Important Scientists * **Robert Koch** * Established experiments to show that a specific microorganism causes a particular disease. * Developed pure culture methods. * **Anton van Leeuwenhoeck** * Developed single-lens to observe living microbes. * **Louis Pasteur** * Deve...

# Three Important Scientists * **Robert Koch** * Established experiments to show that a specific microorganism causes a particular disease. * Developed pure culture methods. * **Anton van Leeuwenhoeck** * Developed single-lens to observe living microbes. * **Louis Pasteur** * Developed a rabies vaccine. * Disproved spontaneous generation theory. * Laid the foundation of aseptic techniques.