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• W2383304950 abstract "Thirteen strains of oil-degrading bacteria were isolated from the soil around the 29-8# and 29-681# wells in Shengli oilfield.Of the bacteria,stains DH-5,DH-8 and DH-9 showed higher efficient degradation rates,all above 40%.Then morphological tests,physiological and biochemical experiments,and molecular identifications of 16S rDNA of isolated high efficient oil-degrading bacteria were performed.The three strains were similar to Pseudomonas,Citrobacter and Klebsiella respectively on morphological tests and on physiological and biochemical experiments.Based on the 16S rDNA analyses,strain DH-5 was most close to Pseudomonas geniculata ATCC19374T(AB021404)with 99.707% similarity,strain DH-8 was most close to Citrobacter farmeri CDC2991-81T(AF025371)with 98.818% similarity,and strain DH-9 was most close to Klebsiella oxytoca JCM1665T(AB004754)with 97.700% similarity.Then the three strains′ capacity of utilizing different substrates was studied by using common petroleum products and typical straight-chain alkanes and aromatic hydrocarbons as the sole carbon source,and the composition and content of the fatty acids in metabolites of crude oil were determined by gas chromatography(GC).We then found that strain DH-5 grew well on long-chain alkanes such as liquid paraffin(C16-C20),strain DH-9 grew well on short-chain alkanes such as hexane(C6),and both of the strains could utilize cycloparaffins(such as cyclohexane and cyclohexanone)well.However,strain DH-8 grew poorly or even showed no growth on alkanes,but it showed strong growth on naphthalene and phenanthrene.Strains DH-5 and DH-9 grew poorly on the two pAHs.All the 3 highly oil-degrading bacteria strains could use various components of crude oil,and the capacity of their utilizing hydrocarbons was in the order of DH-5,DH-9,DH-8.The metabolite analysis of the three strains cultured in the oil culture medium showed that acetic acid,propionic acid,butyric acid and valeric acid were all detected in the medium,and acetic acid was the major short carbon chain organic acid.Besides,the content of acetic acid in the medium of strain DH-5 was obviously higher than in the medium of the other two stains.Also,13 long-chain fatty acids were detected in the medium.The variety and content of these fatty acids produced by the 3 strains were different,with strain DH-9 producing more fatty acids than the other two strains.The carbon numbers of the fatty acids were concentrated in C8-C24 produced by strain DH-9,and the carbon numbers of the fatty acids were concentrated in C8-C18 produced by strains DH-5 and DH-8.Thus,it concluded that the monoterminal oxidation pathway and the diterminal oxidation pathway were probably the oil-degrading pathways of the above-mentioned 3 high oil-degrading bacteria strains." @default.
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• W2383304950 date "2013-01-01" @default.
• W2383304950 modified "2023-09-24" @default.
• W2383304950 title "Isolation and identification of oil-degrading bacteria in Shengli oilfield soil and analysis of metabolites" @default.
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