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Science 21 June 1974:
Vol. 184. no. 4143, pp. 1292 - 1294
DOI: 10.1126/science.184.4143.1292
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Articles

"Decision"-Making in Bacteria: Chemotactic Response of Escherichia coli to Conflicting Stimuli

Julius Adler 1 and Wung-Wai Tso 1

1 Departments of Biochemistry and Genetics, University of Wisconsin, Madison 53706

Motile bacteria presented simultaneously with both attractant and repellent respond to whichever one is present in the more effective concentration. Apparently bacteria have a processing mechanism that compares opposing signals from the chemoreceptors for positive and negative taxis, sums these signals up, and then communicates the sum to the flagella.


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