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A series of essential oils of 11 Turkish plant spices [black thyme, cumin, fennel (sweet), laurel, marjoram, mint, oregano, pickling herb, sage, savory, and thyme], used in foods mainly for their flavor, aromas, and preservation, in herbal tea, in alternative medicines, and in natural therapies, were screened for antibacterial effects at 1:50, 1:100, 1:250, and 1:500 dilutions by the paper disc diffusion method against six Bacillus species (Bacillus amyloliquefaciens ATCC 3842, Bacillus brevis FMC 3, Bacillus cereus FMC 19, Bacillus megaterium DSM 32, Bacillus subtilis IMG 22, and B. subtilis var. niger ATCC 10). All of the tested essential oils (except for cumin) showed antibacterial activity against one or more of the Bacillus species used in this study. Generally, the essential oils at 1:50 and 1:100 levels were more effective. Only one essential oil (laurel) was not found effective against the tested bacteria. The bacterium …