Word: amino
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Dates: during 1936-1936
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...three years Biochemist William Gumming Rose and his associates at University of Illinois have fed artificially-made food to white rats. Of the ingredients in natural food only the proteins furnish nitrogen available for tissue building. Chemists have broken down the proteins into more than 20 simpler compounds called amino acids. Dr. Rose accordingly prepared and purified all the amino acids he knew of, fed them to baby rats together with synthetic carbohydrates, fats, salts and vitamins. Something was lacking. The animals failed to grow, wasted away, died. Then Dr. Rose succeeded in isolating another protein component: alpha -amino -beta...
Describing these experiments last week, Dr. Rose said that eight other amino acids have been found essential to life, seven others nonessential. Work on the value of the remaining protein components continues...