The biopolymer poly-3-hydroxybutyrate (PHB) is a polyester produced by certain bacteria utilizing glucose, corn starch or wastewater nutrients. The characteristics of PHB are similar to those of petroplastic polypropylene. PHB produces transparent film at a melting point higher than 130 degree Celsius that is non toxic and biodegradable without residues, which reduce greenhouse gas emissions considerably. Currently, application of PHB is limited to medical science because of its higher production cost. Microbial biosynthesis of PHB starts with the condensation of two acetyl-CoA molecules into...