Word: strains
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Dates: during 1960-1969
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...affair as stabler and healthier than those in his previous films. The love scene is composed entirely of close-ups of them together. But almost immediately, by using out-of-focus camerawork and contrasting their points-of-view in his editing, Hitchcock begins to separate them visually, to put strain on the stability of their relationship...
Headaches of Work. Others saw far more potential trouble in the new act-the possibility that it would strain the nation's short supply of doctors, nurses and hospital beds. On the other hand, Dr. Edwin Crosby, director of the American Hospital Association, saw U.S. hospitals as easily able to absorb the influx of Medicare patients. And most Government authorities agreed. But they also worried lest the A.M.A.'s stand add unnecessarily to the headaches of making Medicare work...
...tests involving 32 different strains of bacteria, Cornell University Biologist Martin Alexander and General Electric Chemist John Gould have found that each excretes metabolic wastes that are chemically distinct. When the waste products of a single strain are passed through a laboratory chromatograph. a device that separates chemical compounds, they produce a distinctive graph with characteristic peaks and valleys. Thus the graphs or chromatograms of unidentified bacteria can be com pared with those of known bacteria and-like fingerprints-be used to establish their exact identity...
Segregated Compounds. To prepare a bacterial chromatogram, Scientists Alexander and Gould use a pure strain of bacteria, allow them to grow for several hours in a nutrient solution, then extract the metabolic products that have been excreted. These are injected into a chromatograph, where they are converted by heat into gaseous form and fed into a column containing a packing material and an organic liquid such as Carbowax-a chemical that has a different attraction for the molecules of each chemical compound. Thus every compound that passes through the column is slowed to a degree...
...order of its speed through the column-it is sensed by an ionization detector and recorded on a graph as a distinct peak. Within minutes, all of the compounds have passed through the chromatograph, each forming its own peak on the graph. Since the metabolic products of each strain of bacteria contain different chem ical compounds, each chromatogram forms an easily identifiable profile...