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Louis Pasteur. Portrait of the French chemist and microbiologist Louis Pasteur (1822-1895) as a young man aged 20. Pasteur is considered the founder of the science of microbiology and the "father" of the germ theory of diseases. In the germ theory, he believed that diseases were caused by tiny organisms transmitted from person to person. In his laboratory research he developed two vaccines: the first against anthrax, a major disease of cattle, and the second against rabies. Pasteur also recognised that wine and beer, under gentle heating, could be preserved from souring. This process is now known as pasteurization and widely applied in the food industry.
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