Fig. 2

Planktonic antimicrobial activity: optical density. Antimicrobial activity assays for the known antimicrobial CPC compared favorably when performed manually (bottom) or with automation (top). Each CPC concentration was replicated four times in each assay (replicates are connected by grey lines). Black traces, points, and horizontal bars show three-factor logistic fits, calculated IC50 values, and day-to-day precision, as described in the “Materials and methods” section