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Louis Pasteur. Portrait of Louis Pasteur (1822- 1895), French chemist and bacteriologist. Pasteur founded the science of microbiology and discovered that diseases were caused by tiny organisms trans- mitted from person to person. He developed vaccines against anthrax and rabies. Pasteur also discovered that foodstuffs, under gentle heating, could be preserved from souring. This pasteurization process is now widely used in the food industry. As a chemist he discovered that some crystals had two forms, one which would rotate plane-polarised light to the left, and the other would rotate light to the right; this led to the study of stereochemistry.
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