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(A) Two coverslip sensors for O2 imaging with a <1- to 2-μm-thick polystyrene layer containing the O2 indicators Ru(diphenyl phenanthroline)3Cl2 (orange color) and the metalloporphyrin Pt(II) meso-tetra(pentafluorophenyl)porphine (red color). The latter is shown mounted as a lid on a biofilm growth flow chamber. (B) Interferometric measurement of indicator layer thickness and homogeneity of an oxygen coverslip sensor.
