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. Author manuscript; available in PMC: 2016 Mar 17.
Published in final edited form as: Adv Healthc Mater. 2015 Jan 21;4(6):903–910. doi: 10.1002/adhm.201400685

Figure 4.

Figure 4

pH mapping of S. epid. 12228 growth through tissue. (a) Photograph of the sample after S. epid. 12228 grew for 2 h at the interface of the pH sensor film and the TSA plate at 37 °C. (b) Ratio map of the reference region. The XELCI images appear to be mirror images of the photographs because the XELCI images were viewed from below. (c) Ratio map of the sample region after 2 h growth. (d) Ratio map of the same region 3 h later. The color bars on the right are the ratios of the peak intensity at 620 nm over intensity at 700 nm. The x and y axis in b-d represent position. Step size=300 μm, scale bar=1 mm.