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. 2016 Jan 27;7:10535. doi: 10.1038/ncomms10535

Figure 3. Electrochemical imaging of a ΔphzHM biofilm.

Figure 3

(a) Electrochemical imaging, based on reductive SWV, of a ΔphzHM biofilm after 2 days of development. Pixel intensity is proportional to PCA concentration. An unidentified compound provides the reductive peak at −300 mV (c). Because the unidentified compound cannot be calibrated to concentration values, it is scaled relative to PCA based on SWV peak current. PCA is shown in green and the unidentified compound in blue. Maximum error due to electrode variability is 28 μM for PCA. Images are 8 mm × 8 mm. (b) Locations of example square-wave voltammogram and cross-section in c,d, respectively. (c) Example square-wave voltammogram from a single electrode. (d) Example cross-section from the electrochemical image in a. Because the unidentified redox-active species cannot be calibrated to concentration values, it is scaled relative to PCA based on SWV peak current.