Increasing the agitator speed would increase the oxygen
transfer rate. Interestingly, as can be seen in Fig. 3, where the
DO level was controlled at 2.5% air saturation, Y
was not
affected by changing the agitator speed. Since 2.5% air saturation
is a level at which the HAsynthesis can be improved further,
it would therefore suggest that the role of dissolved oxygen in
the HA synthesis is not of the substrate, rather, it functions as a
stimulant. In addition, 5% air saturation is the critical DO level
for the HA synthesis. It should be noted that a critical DO level
is not meaningful in aerobic cultures, when dissolved oxygen
serves as a component of the substrate.
Increasing the agitator speed would increase the oxygentransfer rate. Interestingly, as can be seen in Fig. 3, where theDO level was controlled at 2.5% air saturation, Ywas notaffected by changing the agitator speed. Since 2.5% air saturationis a level at which the HAsynthesis can be improved further,it would therefore suggest that the role of dissolved oxygen inthe HA synthesis is not of the substrate, rather, it functions as astimulant. In addition, 5% air saturation is the critical DO levelfor the HA synthesis. It should be noted that a critical DO levelis not meaningful in aerobic cultures, when dissolved oxygenserves as a component of the substrate.
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