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MIC (MICAB) of a mixture of two biocides or metabolic inhibitors A and B as a function of concentration (solid line). The line is theoretical. Mixture compositions above the line are not inhibitory, whereas compositions below the line are inhibitory. The dotted lines represent the equation given in the text, using an MICA of 1 mM, an MICB of 5 mM, and FICI values of 0.2, 0.4, 0.6, 0.8, and 1.0, as shown.
