Fig. 1.

(a) Microfluidic chip design used in this study without considering the polymer layer surrounding the channels. The system consists of one central gel channel (blue) and two lateral media channels (red). (b) Cross-section of the media channel with the height of $h$. Cells are considered as a thin layer with the height of $h_c$ at the channel’s bottom. Here the polymer layer and oxygen sensor foil respectively on top of and under the media channel are shown to provide a general insight into the microchip structure