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. Author manuscript; available in PMC: 2012 Nov 2.
Published in final edited form as: J Mater Chem. 2011 Nov 3;2011(48):19293–192301. doi: 10.1039/C1JM13754A

Figure 4.

Figure 4

Monitoring pH and oxygen changes using the optical sensors. A, B, and C are for the measurements at exponential phases at room temperature using three different films; D, E, and F are for the measurements at stationary phases at room temperature using three different films. G gives the time-dependent differences of pH values of the stationary phase and exponential phases. H gives the time-dependent differences of dissolved oxygen concentrations of the stationary phase and exponential phases. OD730 of the cell densities for these studies are 0.5.