Word: typhimurium
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Dates: during 1970-1979
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...determine the correlation, Commoner and his Washington University colleagues tested 92 chemical compounds on strains of the common bacteria Salmonella typhimurium, developed by Ames. Each compound was made up in three different concentrations and mixed with preparations made from seven different rat tissues (liver, kidney, brain, stomach, lung, spleen and blood); each of the mixtures was then added to culture dishes containing the Salmonella...
...seem, however, the little creatures have a rudimentary form of memory, according to two researchers at the Berkeley campus of the University of California. After performing an intriguing series of experiments, the scientists reported to the annual meeting of the American Chemical Society that the common intestinal bacterium Salmonella typhimurium can recall things in its past...
Biochemists Robert M. Macnab and Daniel Koshland were investigating a characteristic that S. typhimurium shares with many other bacteria: it responds strongly to changes in external stimuli. If, for instance, a hostile substance is introduced into its surroundings, the bacterium uses its flagella -long, hairlike appendages-to swim away from it. But if something attractive is placed near by-say, the sugar, glucose-it will move toward it. How the bacterium chooses its direction is still not fully understood, but it apparently makes its way on a trial-and-error basis. Tumbling to and fro, it senses that taking certain...
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