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Muramic acid is a chemical marker for bacterial peptidoglycan. Air monitoring was performed in a stable and a dairy. Airborne dust was collected for 68-95 h on Teflon filters for muramic acid analysis. Filters were cut in two and the replicates analyzed separately. The filters and associated dust were heated in sulfuric acid to release muramic acid. Muramic acid was converted to muramicitol pentaacetate...