3-Hydroxybutyric Acid - biosynthesis, Acetoacetyl-CoA reductase, Acetyl-CoA acetyltransferase, Bacterial Proteins - genetics, Bacterial Proteins - metabolism, Carboxylic Ester Hydrolases - genetics, Carboxylic Ester Hydrolases - metabolism, Chemical properties, Genetic aspects, Genetic Engineering, Nitrogen - metabolism, Physiological aspects, Polyhydroxybut...