Aeration 2 Azotobacter 2 Carbon 2 Carbon partitioning 2 Escherichia coli 2 Glucose 2 Glycerol 2 Hydroxybutyrates 2 Oxidation-Reduction 2 Oxygen 2 Oxygen availability 2 Poly(3-hydroxybutyrate) 2 Polyesters 2 aeration 2 article 2 bacterial growth 2 bacterial metabolism 2 bacterium culture 2 carbon source 2 glycerol 2 nonhuman 2 oxidation reduction reaction 2 poly(3 hydroxybutyric acid) 2 synthesis 2