Fig. 4.

Characterization of H₂O₂-sensitive Serratia sp. LCN16 (oxyR::int(614) and katA::int(808)) and resistant Serratia sp. LCN16 wild-type (WT): growth curves (a); H₂O₂ inhibition (mm) (b); growth in 24 h exposure to H₂O₂ (c); and biofilm production (d). H₂O₂ inhibition was determined by measuring the diameter of the halo surrounding the H₂O₂ (30 %, v/v) spot-inoculation. Biofilm production was determined as described in [56]. Error bars indicate standard deviation. Asterisk (*, **) on the top of the columns denotes statistical differences at 95–99 % confidence level by Students T-test (EXCEL version 15.14), when compared with wild-type Serratia sp. LCN16