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The purpose of this investigation was to try to understand the antibacterial mechanism of L-(−)-usnic acid isolated for the first time from fruticose lichen Usnea subfloridana using clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA). The minimum inhibitory concentration (MIC) of L-(−)-usnic acid against the clinical isolates of MRSA and reference strain S. aureus MTCC-96 (SA-96)...
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