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. 2019 Mar 22;85(7):e02956-18. doi: 10.1128/AEM.02956-18

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FIG 5 — CFU and nucleic acid levels of biofilm bacteria shed from drinking water biofilms during disinfectant treatment. Beaker water derived from chlorine (A and B) or monochloramine (C and D) treatment of Cu (A and C) and PVC (B and D) drinking water biofilms colonized with LpP1s1 was analyzed for LpP1s1 and HPC CFU (shown as bars with corresponding units on the left axis, log₁₀ CFU liter⁻¹), and total DNA and cDNA qPCR (shown as open symbols with connecting lines and units on the right axis, log₁₀ genomic copies [GC] liter⁻¹). Data (mean ± SD) are representative of two independent experiments (n = 2) for each exposure time. a, P ≤ 0.05 for free chlorine Cu versus monochloramine Cu at 5 min. *, P ≤ 0.05.