Word: radiophosphorus
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Dates: during 1940-1949
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...made into phosphorus compounds and fed to plants or experimental animals. Wherever it goes it betrays its presence by telltale radioactivity. Thus, biologists can use it to measure the amount of phosphorus-containing protein which moves out of the nucleus of a microscopic living cell. Without radiophosphorus, such an experiment would be impossible. Many researchers, hoping to learn how disease germs enter the body and how they do their damage, are tagging living bacteria with radioactive phosphorus...
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