Word: signal
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Dates: during 1960-1969
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...prospectors, U.S. Geological Survey scientists have designed and successfully tested a "silver snooper," a device capable of locating silver deposits buried as deep as three feet below the ground. By shooting a stream of neutrons into the earth, the snooper turns the silver temporarily radioactive, causing it literally to signal its presence...
...than one protein. However, it was not understood how the cell "punctuated" the message to separate one protein from the next: the chain of the first protein must be terminated right before the first amino acid of the second protein. For a while it was thought that the only signal required was a special codon in the messenger that said "stop...
...last fall Capecchi and Jerry M. Adams, another pre-doctoral student at the Biology labs, found evidence that an initiator signal was also required, and that part one of this signal was the amino acid N-formylmethionine...
...Wald, 59, shows why. As a researcher, he has made one of the most enlightening finds of recent decades: his discovery of the Vitamin A molecule in the retina goes a long way toward explaining the physiology of eyesight. Light, it seems, makes this crooked molecule straighten out and signal the optic nerve. The very originality of such work also makes Wald a frontiers-of-research lecturer, and his "Nat Sci 5," in the Harvard Crimson's judgment, is "one of Harvard's truly great courses...
...accident last Monday at the intersection of Memorial Drive and Western Avenue resulted from a traffic hazard that ought to have been corrected long ago. Officials of the Metropolitan police have complain some time that the traffic signals at this corner and at the intersection of Memorial and River Street are located in a "blind Since the lights are raised only about feet above the ground, drivers approaching the corner cannot see whether the signal is red, green or yellow until they...