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How did oxygen affect butyric acid fermentation in Louis Pasteur’s experiments?
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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.)
In his research on butyric acid fermentation, Louis Pasteur discovered that the process could be arrested by passing oxygen through the fermenting fluid.1
This observation, now known as the Pasteur effect, led him to conclude that the specific microorganisms responsible for this fermentation could only function in the absence of oxygen. Consequently, Pasteur introduced the terms aerobic and anaerobic to distinguish between organisms that require oxygen to live and those that function in its absence. He further applied this understanding to putrefaction, proposing that it is caused by specific germs that operate under anaerobic conditions.1