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How did Louis Pasteur distinguish aerobic organisms from anaerobic organisms?
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Louis Pasteur
In the 19th century Louis Pasteur's work established the germ theory of disease, proving that microorganisms cause fermentation and sickness, which led to the development of pasteurization, aseptic techniques in medicine, and effective vaccines for diseases such as rabies. (Painting by Albert Edelfelt, 1885.)
Louis Pasteur distinguished between aerobic and anaerobic organisms through his research on fermentation, specifically his studies of butyric acid fermentation.1
He observed that the fermentation process could be arrested by passing oxygen through the fermenting fluid, a phenomenon now known as the Pasteur effect. Pasteur concluded that this inhibition occurred because certain life-forms could function only in the absence of oxygen.1
Based on these findings, he introduced the terms aerobic and anaerobic to categorize organisms based on whether they live in the presence or absence of oxygen, respectively. He further proposed that putrefaction was caused by specific germs that operate under these anaerobic conditions.1