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SEM micrographs showing the effect of the LTC II EO on the morphology and structure of the biofilm after 24 h of culture: (a) Untreated S. aureus ATCC 29213; (b) S. aureus biofilm treated with LTC II EO; (c) Untreated E. coli ATCC 25922; and (d) E. coli ATCC 25922 treated with LTC II EO. Micrographs are presented at 8000× magnification. Red arrows indicate cell membrane shrinkage, deformed cells, and seriously damaged cells.
