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. 2020 Aug 21;11:1988. doi: 10.3389/fmicb.2020.01988

FIGURE 5.

FIGURE 5

Intracellular activities of AOX, FLD, FDH and formaldehyde concentration at four induction strategies. (A) Activity of alcohol oxidase (AOX, U/g-cell). (B) activity of formaldehyde dehydrogenase (FLD, U/g-cell). (C) activity of formate dehydrogenase (FDH, U/g-cell). (D) formaldehyde concentration (mM). Time zero indicates the initiation of methanol addition. DO-stat strategy (filled green diamond), μ-stat strategy (open blue circle), m-stat strategy (open black triangle), co-stat (filled red square). Asterisk indicates the two-group have significant difference (∗∗∗P < 0.001).