How do the pure essential oils of Melaleuca alternifolia (tea tree), Origanum vulgare (oregano), Syzygium aromaticum (clove), Mentha piperita L (peppermint), and Cinnamomum verum (cinnamon) compare at inhibiting the growth of Escherichia coli incubated at 30°C in Columbia agar for 24 hours per the Kirby-Bauer method, as measured by the diameter of the inhibition zone around a 10 μL essential oil impregnated disc?SL
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