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(a) Absorbance of biofilm biomass after 48 hours in contact with Protium heptaphyllum essential oil (EOPH) at different concentrations. (b) Absorbance of preformed biofilm after six hours in contact with EOPH at different concentrations. NC: negative control. TC: turbidity control. MIC: minimum inhibitory concentration. ∗∗∗p < 0.01 vs. NC. #p < 0.01 vs. TC.
