Elie Metchnikoff was born in the Russian Empire in the city of Odessa. His father, a well-known chemist, moved to Paris when Elie was two years old. After attending the University of Odessa, he went to work for his father in his laboratory. He soon became interested in general chemistry and began to investigate an unusual series of chemical reactions taking place in the stomachs of rats
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His research led him to conclude that the juices of the stomach protected their contents from digestion. These so-called gastric juices were, in fact, completely lacking in any gastric acid whatsoever. This discovery brought him much fame when it was published in 1915.
He continued his work at the Pasteur Institute, where he worked to prove that bile is essential to digestion. He also studied bacteria and showed that they are necessary for life itself. In 1920, Metchnikoff took a job with the American Tobacco Company in New York City, hoping that this would allow him to continue his research without interference from other scientists who might not be as accepting of his ideas as they were.
He died suddenly on August 9th, 1948 at the age of sixty-eight.