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- ItemPaper based packaging material coated with microbial polyhydroxyalkanoates: An approach towards 100% biodegradability(Aquastar, 2020) K.R, Sreelakshmi; V, Murugadas.; S, Remya; Raj, Rehana; C.O, MohanPolyhydroxyalkanoates (PHAs) are the polyesters produced by microorganisms under limiting conditions of nitrogen, phosphorus, oxygen or magnesium in the presence of excess of carbon. Polyhydroxybutyrate (PHB) was the first discovered form of PHA in 1926 and is from Bacillus Megaterium. Today, more than 300 microorganisms are known to synthesis and accumulate PHA intracellularly. Also genetically modified microbes and plants are being reported for the production of PHA. PHA can be of short chain length (3±5 carbon atoms) or medium chain length (6±14 carbon atoms). Polyhydroxyalkanoates are found to be fully biodegradable.