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Poly(β-hydroxybutyric acid) or PHB is a bacterial polymer whose biocompatability, biodegradability and versatile properties make it an eco-friendly substitute for synthetic polymers. It is synthesized by Ralstonia eutropha from glucose as the main carbon source. However, better productivity is obtained through co-cultures of Lactobacillus delbrueckii and R. eutropha. PHB concentrations of 12g/l have...