Figure 3From: Comparison of the antibacterial activity of essential oils and extracts of medicinal and culinary herbs to investigate potential new treatments for irritable bowel syndrome Antibacterial activity of essential oils in zone of clearance assays. Graph showing mean halo diameters +/- SEM obtained from four separate zone of clearance assays to determine the ability of plant essential oils to lyse E. coli. Significance levels obtained from two-tailed t tests are denoted by stars: * = Significant, P < 0.05; ** = highly significant, P < 0.01; *** = very highly significant, P < 0.001.Back to article page