Word: tracers
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...similar "tracer" experiment, Ruben & Co. introduced radioactive carbon into plants (TIME, June 23), were later unable to find any radioactive formaldehyde in them. (Formaldehyde is poisonous to plants, anyway.) This was another blow to the old theory...
...chemical analysis. The radioactivity can be detected by killing an animal after it has eaten radioelements, then assaying the radioactivity of its various tissues. It can also be detected by placing a Geiger counter, a device which measures radioactivity, over a part of the body where the tracer elements are suspected so that the metabolic ebb & flow of the tagged substance can thus be observed while the subject is alive. Or the detection can be accomplished by taking paper-thin slices of plant or animal tissue, placing them on a photographic plate, and letting them leave their own radio-autograph...
...body's phosphorus). Since 1938 doctors have been using radio-phosphorus instead of radium or X-ray exposure in the treatment of leukemia, a mysterious cancerlike disease of the blood and blood-forming tissue such as bone marrow. This is the first therapeutic application resulting from tracer studies with radioelements...
...yards away on a slight rise, and waved his right arm. There was dead quiet for perhaps ten seconds. Then M3 turned loose a horizontal stream of red death, directed towards a silhouette target 900 yards away. From the muzzles of four .30-caliber machine guns spurted bright tracer bullets; from the turret, the shells from a 37 mm. cannon cracked into the faraway pines. Ordnance men from far & wide saw what they had come mainly to see: the steady (22 to the minute) fire of the 75-mm. gun mounted on the starboard side of M3's hull...
...airplane motors, crankcases, landing wheels, pontoons; the weight it saves can then be switched to gasoline or bomb load. It also has important military use in lightweight bomb casings and (because of the inflammability which once made it invaluable to photographers as flashlight powder) in parachute flares, incendiary bombs, tracer bullets. German production, according to Arnold, has jumped 500% since 1938 (to an estimated 25,000 tons last year...