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首页> 美国卫生研究院文献>Springer Open Choice >Crude Oil-Degradation and Plasmid Profile of Nitrifying Bacteria Isolated from Oil-Impacted Mangrove Sediment in the Niger Delta of Nigeria
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Crude Oil-Degradation and Plasmid Profile of Nitrifying Bacteria Isolated from Oil-Impacted Mangrove Sediment in the Niger Delta of Nigeria

机译：尼日利亚尼日尔三角洲油浸红树林沉积物中分离的硝化细菌的原油降解和质粒概况

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摘要

The crude oil degradability and plasmid profile of autotrophic nitrifying bacteria, Nitrosomonas and Nitrobacter species, isolated from mangrove sediment in the Niger Delta of Nigeria were studied. The effects of temperature, pH and optical density on the utilization of different carbon sources by the bacteria were also investigated. Results showed that nitrifying bacteria could utilize kerosene, diesel oil, jet fuel and engine oil as carbon sources. None utilized hexane and xylene but moderate growth was observed in benzene, phenol and toluene. However, their ability to utilized crude oil varied both in rates of utilization and in growth profiles. Mixed culture of the isolates degrades 52 % of crude oil introduced into the medium followed by Nitrosomonas sp. with 40 % degradation. The least was Nitrobacter sp. with 20 % degradation. The ability of the autotrophs to degrade crude oil was found to be plasmid-mediated through curing experiment and electrophoresis. The size of the plasmid involved was estimated to be 23 kb. The high crude oil utilization of the mixed culture implies that nitrifying bacteria isolated from contaminated ecosystem are excellent crude oil degraders and can be harnessed for bioremediation purposes.
机译：研究了从尼日利亚尼日尔三角洲的红树林沉积物中分离出的自养硝化细菌，亚硝化细菌和硝化细菌的原油降解能力和质粒图谱。还研究了温度，pH和光密度对细菌利用不同碳源的影响。结果表明，硝化细菌可以利用煤油，柴油，喷气燃料和机油作为碳源。没有使用己烷和二甲苯，但在苯，苯酚和甲苯中观察到适度的增长。但是，他们利用原油的能力在利用率和增长方面都不同。分离物的混合培养会降解引入培养基的52％的原油，然后是亚硝基梭菌（Nitrosomonas sp。）降解40％最少的是硝化细菌。降解20％通过养护实验和电泳发现自养生物降解原油的能力是质粒介导的。所涉及质粒的大小估计为23 kb。混合培养物中原油的利用率高，这意味着从受污染的生态系统中分离出的硝化细菌是出色的原油降解剂，可用于生物修复。

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