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Fig. 3 | Microbial Cell Factories

Fig. 3

From: Parallel substrate supply and pH stabilization for optimal screening of E. coli with the membrane-based fed-batch shake flask

Fig. 3

Oxygen transfer rate of cultivations with increased ammonium sulfate concentrations in the culture medium in cultivations with the membrane-based fed-batch shake flask. Cultivation conditions: Wilms-MOPS-mineral medium (culture medium: 200 mM MOPS with varied initial ammonium sulfate, initial reservoir glucose concentrations: 500 g/L, blue dextran concentration: 2 g/L), temperature: 37 °C, shaking frequency: 350 rpm, shaking diameter: 50 mm, initial culture medium volume: 10 mL, inoculation OD600: 0.5, reservoir filling volume: 2 mL, dialysis membrane: Reichelt 10–20 kDa, membrane area: 18.1 mm2; Strain: E. coli BL21 (DE3) pRhotHi-2-EcFbFP; The arrows point to the occurrence of abrupt OTR increases

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