Bacterial growth in THB at 37°C in ambient air was monitored using an OD monitor (ODBox-C; TAITEC, Koshigaya, Japan). Overnight culture (60 μL) was diluted in 6 mL of fresh THB. The cultures were shaken at 160 rpm and the optical density (600 nm) was measured every 5 min for 24 h. The experiment was performed five times.
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