poly(3 hydroxybutyric acid) article 58 Hydroxybutyrates 48 Polyesters 46 nonhuman 38 Escherichia coli 32 Azotobacter 28 bioreactor 24 hydroxybutyric acid 24 Bacteria (microorganisms) 22 bacterial growth 22 metabolism 22 poly-beta-hydroxybutyrate 22 polyester 22 Bioreactors 20 Poly(3-hydroxybutyrate) 20 bacterial strain 20 controlled study 20 genetics 20 bacterial gene 18 Bacterial Proteins 16 Glycerol 16 aerobic metabolism 16 carbon 16 glycerol 16 recombination 16 Biomass 14 Escherichia coli Proteins 14 Mutation 14 priority journal 14