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. 2019 Sep 12;7(9):345. doi: 10.3390/microorganisms7090345

Figure 1.

Figure 1

Effect of essential oils (EOs) on the biofilm formation of Listeria monocytogenes and Escherichia coli polymicrobial cultures. (A) cinnamon EO, (B) cinnamaldehyde, (C) marjoram EO, (D) terpinen-4-ol, (E) thyme EO, and (F) thymol. Columns represent the OD590 values, dashed lines represent cell numbers of L. monocytogenes, and dotted lines cell numbers of E. coli. Results are presented as mean ± standard deviation of six replicates. Different letters indicate statistically significant differences between columns (p < 0.05).