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Schematics illustrating the effect of the depth of a microchannel on the growth of E. coli. (a) For a microchannel with a large depth, the oxygen level is relatively low for supporting the growth of all E. coli as a result of the large S/V ratio. (b) For a microchannel with a small depth, the oxygen level is relatively abundant, which supports rapid growth of the pathogens.
