Word: nitrogenating
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Last week Dr. Urey announced production in experimental quantities of another overweight element - heavy nitrogen, which weighs 15 units to 14 for ordinary nitrogen. After two years of work he and his associates have produced 20 grams of heavy nitrogen in 2½% concentration, 400 grams of lower concentrations. To obtain it they used a 35-ft. vertical tube designed by Columbia's George B. Pegram for the separation of heavy oxygen. The tube contains 1,200 steel cones. A gaseous compound of ammonia, rich in nitrogen, passes up through the tube; some condenses, trickles down and with each...
...biological label, heavy nitrogen promises Lo be even more important than heavy hydrogen, since nitrogen is the characteristic constituent of protein foods and their constituent amino acids. With Dr. Urey's heavy hydrogen, Biological Chemist Rudolph Schoenheimer...
Columbia set out to discover what happens in the body to benzoic acid, a nitrogen compound used as a food preservative. In the test acid he substituted heavy nitrogen for ordinary nitrogen. Feeding it to laboratory animals, he found that about 70% of the acid passed through the walls of the intestine combined with glycine and was eliminated by the kidneys...
...atoms. Although they cannot be seen under the microscope, the giant, complex molecules of proteins are among the most important targets of current research in biological chemistry. Until recent years not much was known about them except that they were very big; that they contained carbon, hydrogen. oxygen, nitrogen and sometimes sulphur and phosphorus; that in such animal processes as digestion they were broken down by protein-wreckers called enzymes and that they were composed of polypeptide chains which might, presumably, be contorted in any number of patterns...
...hidden one." In the U. S., small quantities of krypton have been obtained by Linde Air Products Co. and Air Reduction Co. during the fractional distillation (selective boiling) of liquid air, and sold to academic laboratories for $100 a litre if pure, $15 a litre if mixed. Argon or nitrogen at low pressure are the usual fillers for electric tamp bulbs manufactured in the U. S. In Europe, however, krypton-filled lamps have been manufactured by Philips Glowlamp Works of Holland and other companies for about three years. Krypton lamps cost 75?, compared to 25? for argon lamps, but their...