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  identified many species and set up a starting point for classification of organisms
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  he made microscopes which he later likely saw protozoa for the first time
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  he published a book over classification and nomenclature
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  made the small pox vaccine
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  he developed an apparatus that improved both the safety and the effectiveness of chloroform
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  made suitable conditions for patients to prevent them from infections or getting even more sick than what they already were
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  Louis was asked to help solve problems related to alcohol production at a local distillery, and thus he began a series of studies on alcoholic fermentation. His work on these problems led to his involvement in tackling a variety of other practical and economic problems involving fermentation. His efforts proved successful in unraveling most of these problems, and new theoretical implications emerged from his work.
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  he found out that cleaning his surgical instruments with carbolic acid prevented the patients from getting infections after surgery
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  discovered the life cycle of anthrax
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  Pasteur vaccinated Joseph Meister, a nine-year-old boy who had been bitten by a rabid dog. The vaccine was so successful that it brought immediate glory and fame to Pasteur.
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  was one of the first to discover a substance in blood serum that was capable of destroying bacteria he also introduced the pyrogallic method for cultivation of anaerobic bacteria
