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CO2 production (μmol/h) of multispecies biofilms grown in 0.14 mM citrate defined medium and exposed to 4000 mg/l streptomycin for 4-h intervals; (A) 0.14 mM citrate medium (B) 0.14 mM citrate growth medium with the addition of 1 mM citrate during the first and second exposure, and a third antibiotic exposure in 0.14 mM citrate medium.
