Thursday, September 19, 2019
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Biology (Bacteria,Virus) (101)

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! EN_00914675_9616 NYT
(NYT53) UNDATED -- May 29, 2006 -- SCI-YOGURT-GENOME -- Photo Illustration. About 5,000 years ago, cattle herders discovered how to make yogurt. Scientists are now discovering that they also mounted an unplanned experiment in evolution. Certain species of bacteria are responsible for turning milk into yogurt. As the microbes feed on sugar in the milk, they produce acidic wastes that cause the milk to clot. They also make the yogurt uninhabitable for other bacteria, preventing it from spoiling. And by breaking down some milk proteins into smaller pieces, they give yogurt its distinctive flavor. (Photo Illustration by Lars Klove/The New York Times)
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