SPECIFIC MICROORGANISMS - The microorganism which belongs to Paenibacillus genus is Paenibacillus amylolyticus TB-13 strain (acceptance number FERM P-19104).    EXAMPLE - 2 g of plastic was dissolved in 40 ml of dichloromethane. 250 ml of distilled water containing 40 mg of anionic surfactant was added, emulsified, heated at 80 degrees Centigrade and dichloromethane was volatilized. 15 g/l of agar was added to solid culture medium containing (in g/l) potassium dihydrogen phosphate (2), dipotassium hydrogen phosphate (7), ammonium nitrate (1), magnesium sulfate heptahydrate (0.1), zinc sulfate heptahydrate (0.001), copper sulfate heptahydrate (0.0001), ferrous sulfate heptahydrate (0.01) and magnesium sulfate 4-6 hydrate (0.002), having pH 7.2. 0.2 g of soil extracted from Japan was placed in a large test tube having internal diameter of 10 mm. 10 ml of the culture medium was added, 2 mg of powder of lactic acid was added, shaking culture was performed at 30 degrees Centigrade, planting splice was repeated 4 times weekly, diluted in agar flat plate containing polylactic acid and 1 g/l yeast extract was emulsified. The microbe with clear zone formed by decomposition of plastic was acquired. TB-13 strain was selected and subjected to standard physiological test according to general method provided in Bergey's manual of systematic bacteriology. The sequencing and analysis of 16 s rDNA gene sequence, were performed. The TB 13 strain was Gram negative and aerobic rods. The strain was able to grow well in glucose, arabinose, ribose, mannose, mannitol, maltose, xylose, fructose, N-acetyl glucosamine, sucrose and trehalose, but was unable to grow in gluconate, sorbitol, arabitol, erythritol, D-arabinose and inulin containing medium. The results are compared with Bergey's manual of systematic bacteriology and the TB-13 strain was identified as Paenibacillus amylolyticus. The microbe strain showed 97.65% homology. The microorganism was tested for plastic decomposing ability on ester-type polyurethane e.g. poly diethylene glycol adipate having mean molecular weight of 2500 and 2,4-tolylene diisocyanate. The result showed that the microbe had excellent plastic decomposing ability.