Towards efficient crude oil degradation by Pseudomonas sp. strain-O2: Application of Plackett-Burman design for evaluation of cultivation conditions (original) (raw)
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Petroleum hydrocarbon pollution is a major environmental concern in developing countries as these pollutants cause hazardous effects to the ecosystems and environment. Green technologies using microorganisms for remediation of these pollutants have gained considerable attention. Petroleum hydrocarbon pollutants degrading and biosurfactant producing Pseudomonas aeruginosa NCIM 5514 was isolated from crude oil polluted site of Ankleshwar, Gujarat, India. Effect of agitation, temperature, pH, NaCl concentration, petroleum and non-petroleum carbon source and its concentrations, nitrogen sources and inoculum ratio on growth of P. aeruginosa NCIM 5514 were studied. Optimum growth of P. aeruginosa NCIM 5514 was observed at 1% (w/v) glucose, pH 7.2, incubation at 37°C at 180 rpm with 1% (v/v) inoculum for four days. However, this organism also utilized crude oil and glycerol as sole carbon source. Thus, P. aeruginosa used in the presented study here appeared as a mesophilic, halotolerant, a...
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Four hydrocarbon degraders isolated from enriched oil-and asphalt-contaminated soils in Lagos, Nigeria, were tested for their petroleum degradation potentials. All the isolates were identified as species of Pseudomonas. Pseudomonas putida P11 demonstrated a strong ability to degrade kerosene, gasoline, diesel, engine oil and crude oil while P. aeruginosa BB3 exhibited fair degradative ability on crude oil, gasoline, engine oil, anthracene and pyrene but weak on kerosene, diesel and dibenzothiophene. Pseudomonas putida WL2 and P. aeruginosa MVL1 grew on crude oil and all its cuts tested with the latter possessing similar polycyclic aromatic potentials as P11. All the strains grew logarithmically with 1-2 orders of magnitude and with generation time ranging significantly between 3.07 and 8.55 d at 0.05 level of confidence. Strains WL2 and MVL1 utilized the oil substrate best with more than 70% in 6 d experimental period, whereas the same feat was achieved by P11 in 12 d period. BB3 on the other hand degraded only 46% within 6 d. Interestingly, data obtained from gas chromatographic analysis of oil recovered from the culture fluids of MVL1 confirmed near-disappearance of major peaks (including aliphatics and aromatics) in the hydrocarbon mixture.
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Copyright © 2013 Debdeep Dasgupta et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The bioavailability of organic contaminants to the degrading bacteria is a major limitation to efficient bioremediation of sites contaminatedwith hydrophobic pollutants. Such limitation of bioavailability can be overcome by steady-state biofilm-based reactor. The aimof this studywas to examine the effect of suchmulticellular aggregation bynaturally existing oil-degrading bacteria on crude oil degradation.Microorganisms, capable of utilizing crude oil as sole carbon source, were isolated from river, estuary and sea-water samples. Biochemical and 16S rDNA analysis of the best degraders of the three sources was found to belong to the Pseudomonas species. Interestingly, one of the isolates was found to be close to Pseudomonas otitidis ...
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Journal of Scientific Research, 2009
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