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Which terms did Louis Pasteur introduce for organisms that live with or without oxygen?
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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 introduced the terms aerobic and anaerobic to describe organisms based on their oxygen requirements. He defined aerobic organisms as those that live in the presence of oxygen, while anaerobic organisms are those that function in its absence.1
Pasteur arrived at these definitions during his research into fermentation and putrefaction. He observed that certain fermentation processes could be inhibited by the introduction of air, leading him to conclude that specific life-forms were capable of surviving only without oxygen.1