Leading into World War II, American scientists scrambled for a way to determine what vitamins, particularly vitamin A, were in food in order to keep US soldiers well-nourished. But state-of-the-art ultraviolet and visible (UV-vis) spectrophotometry, which measures electronic transitions of a wide range of molecules as they absorb light, was cumbersome and expensive.
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The First Commercial UV-Vis Spectrometer
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