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      Polycyclic Aromatic Hydrocarbon-degrading Bacteria from Aviation Fuel Spill Site at Ibeno, Nigeria

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          Abstract

          Polycyclic aromatic hydrocarbon (PAH)–degrading bacteria were isolated from aviation fuel contaminated soil at Inua Eyet Ikot in Ibeno, Nigeria. PAH-degrading bacteria in the contaminated soil were isolated by enrichment culture technique. Isolates with high PAH degrading potential characterized by their extensive growth on PAH-supplemented minimal salt medium were screened for their naphthalene, phenanthrene and chrysene degradability. The screening medium which contained selected PAHs as the sole source of carbon and energy showed that Micrococcus varians AFS-2, Pseudomonas putida AFS-3 and Alcaligenes faecalis AFS-5 exhibited a concentration–dependent growth in all the PAH–compounds tested. There were visible changes in the color of growth medium suggesting the production of different metabolites. Their acclimation to different PAH substrates was also evident as A. faecalis AFS-5 isolated from chrysene grew well on other less complex aromatic compounds. The isolate exhibited best growth (0.44 OD 600) when exposed to 10 ppm of chrysene for 5 days and could utilize up to 90 ppm of chrysene. This isolate and others with strong PAH-degrading potentials are recommended for bioremediation of PAHs in aviation fuel-contaminated sites in the tropics.

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          Most cited references22

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          Principles of microbial PAH-degradation in soil.

          Interest in the biodegradation mechanisms and environmental fate of polycyclic aromatic hydrocarbons (PAHs) is motivated by their ubiquitous distribution, their low bioavailability and high persistence in soil, and their potentially deleterious effect on human health. Due to high hydrophobicity and solid-water distribution ratios, PAHs tend to interact with non-aqueous phases and soil organic matter and, as a consequence, become potentially unavailable for microbial degradation since bacteria are known to degrade chemicals only when they are dissolved in water. As the aqueous solubility of PAHs decreases almost logarithmically with increasing molecular mass, high-molecular weight PAHs ranging in size from five to seven rings are of special environmental concern. Whereas several reviews have focussed on metabolic and ecological aspects of PAH degradation, this review discusses the microbial PAH-degradation with special emphasis on both biological and physico-chemical factors influencing the biodegradation of poorly available PAHs.
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            Microbial degradation of petroleum hydrocarbons: an environmental perspective.

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              The growth of micro-organisms in relation to their energy supply.

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                Author and article information

                Contributors
                richritom7@yahoo.com
                Journal
                Bull Environ Contam Toxicol
                Bull Environ Contam Toxicol
                Bulletin of Environmental Contamination and Toxicology
                Springer-Verlag (New York )
                0007-4861
                1432-0800
                29 March 2012
                29 March 2012
                June 2012
                : 88
                : 6
                : 1014-1019
                Affiliations
                [1 ]Department of Microbiology, University of Port Hacourt, Port Hacourt, Rivers State Nigeria
                [2 ]Department of Microbiology, University of Uyo, Uyo, Akwa Ibom State Nigeria
                Article
                598
                10.1007/s00128-012-0598-7
                3339054
                22456728
                abb4b45b-e73d-4af6-83f4-fff7b2b74221
                © The Author(s) 2012
                History
                : 20 October 2011
                : 10 March 2012
                Categories
                Article
                Custom metadata
                © Springer Science+Business Media, LLC 2012

                General environmental science
                environmental chemistry,soil science & conservation,pollution, general,waste water technology / water pollution control / water management / aquatic pollution,polyaromatic hydrocarbons,biodegradation,environment,aviation fuel-polluted soil,environmental health,ecotoxicology

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