Polyesters article 56 Hydroxybutyrates 50 poly(3 hydroxybutyric acid) 46 Escherichia coli 34 Azotobacter 30 nonhuman 28 polyester 26 bioreactor 24 hydroxybutyric acid 22 poly-beta-hydroxybutyrate 22 Bioreactors 20 metabolism 20 Poly(3-hydroxybutyrate) 18 genetics 18 Bacteria (microorganisms) 16 Bacterial Proteins 16 Glucose 16 Glycerol 16 aerobic metabolism 16 bacterial growth 16 bacterial strain 16 controlled study 16 glycerol 16 recombination 16 Biomass 14 Escherichia coli Proteins 14 Molecular Sequence Data 14 Mutation 14 bacterial gene 14