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(A) Process parameters: pO2, Mixing speed (rpm), Temperature (°C), and pH; (B) Gas compositions: H2, O2, N2, and CO2; (C) Cell density (CD), residual glycerol and products yields; (D) Percent relative residual concentration of anions, with respect to time over the three mode of operation batch (I), continuous (II) and continuous with recycling (III).
