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Using this clue as their Rosetta stone, Nirenberg and other researchers eventually found one or more three-letter code words, or codons, that could call up every single amino acid???plus other words that acted as punctuation, marking the start or completion of a message ordering the production of a protein. Even more remarkable, they learned that the code was universal: the same four letters, taken three at a time to form a single genetic word, code the same amino acids in all living things. Thus by the mid-1960s, scientists finally understood how DNA passes on genetic information with...

Author: /time Magazine | Title: Special Section: THE CELL: Unraveling the Double Helix and the Secret of Life | 4/19/1971 | See Source »

...Yale. Two discoveries have so far come of this research: that in living matter the only substances sensitive to light are sugars?fats, oils and proteins are all unaffected by it; that one of the symptoms of tuberculosis is the appearance in the body of a certain fatty acid???a discovery which should enable the disease to be detected in its very early stages...

Author: /time Magazine | Title: Science: All Chemistry | 5/13/1929 | See Source »

Nitric Acid. Chemists Guy B. Taylor and T. A. Chilton of E. I. duPont de Nemours & Co. urged U. S. manufacturers to speed their adoption of the European method of making nitric acid??? from ammonia, one pound of which will replace five pounds of Chilean nitrate...

Author: /time Magazine | Title: Science: Chemists (Cont'd) | 8/1/1927 | See Source »

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