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Antibiogram to test the antimicrobial properties of oak wood (Quercus petraea) against Staphylococcus aureus with the agar diffusion method: (a) an inert filter paper disc (negative control); (b) a wooden disc showing antimicrobial activity by forming a zone of inhibition and (c) a filter paper disc impregnated with wood extractives (10 mg extractive content extracted with methanol) showing antimicrobial activity by forming a zone of inhibition; ©Authors.
