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Daniel Israel Arnon was a Polish-born American plant physiologist whose research led to greater insights into the operation of photosynthesis in plants. In 1973, he was awarded the National Medal of Science for "his fundamental research into the mechanism of green plant utilization of light to produce chemical energy and oxygen and for contributions to our understanding of plant nutrition."
Arnon was born on November 14, 1910, in Warsaw. Summers spent on the family's farm helped foster Arnon's interest in agriculture. His father had lost the family's food wholesale business after World War I and Arnon's readings of the works of Jack London led him to save up his money to head to California. He enrolled in the University of California, Berkeley from Poland, and would spend his entire professional career at the school, until his retirement in 1978. He ultimately earned his Ph.D. in plant physiology at UC Berkeley under Dennis R. Hoagland and some of his earliest research focused on growing plants in nutrient-enriched water rather than in the soil. During World War II, Arnon served in the United States Army in the Pacific Theater of Operations, where he used his prior experience with plant nutrition on Ponape Island, where there was no arable land available and he was able to grow food to feed the troops stationed there using gravel and nutrient-enriched water.
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