Hydroxybutyrates article 54 Polyesters 50 poly(3 hydroxybutyric acid) 48 Escherichia coli 32 nonhuman 32 Azotobacter 30 bioreactor 24 hydroxybutyric acid 24 metabolism 22 poly-beta-hydroxybutyrate 22 polyester 22 Bacteria (microorganisms) 20 Bacterial Proteins 20 Bioreactors 20 bacterial strain 20 genetics 20 Poly(3-hydroxybutyrate) 18 bacterial gene 18 bacterial growth 18 Glucose 16 Glycerol 16 Molecular Sequence Data 16 Pseudomonas 16 aerobic metabolism 16 controlled study 16 glycerol 16 recombination 16 Biomass 14 Escherichia coli Proteins 14