Euler-Chelpin, Hans Karl August Simon von, 1873–1964, Swedish biochemist, b. Germany, Ph.D. Univ. of Berlin, 1895. He spent his entire career at Stockholm Univ., first as professor and later as director of the biochemical institute. Euler-Chelpin won the 1929 Nobel Prize in Chemistry with Arthur Harden for their investigations on the fermentation of sugar and fermentative enzymes. Euler-Chelpin's work focused in particular on coenzymes, which are necessary for the action of enzymes. He isolated the coenzyme of zymase, an enzyme in yeast, and determined its chemical structure. He also contributed to establishment of the chemical structure of several vitamins.
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