HYDROCARBONOCLASTIC BACTERIA PDF

By: Sonali Bhawsar Category: Applications Date: Views: Article Summary: Hydrocarbons are principle constituents of petroleum, related byproducts like coal tar, diesel, petrol, gasoline, kerosene and major environmental pollutants. Petroleum is composed of straight or branched saturated aliphatic, alicyclic, aromatic and unsaturated olefinic hydrocarbons. Hydrocarbons are recalcitrant because of their oily nature and poor water solubility. They pers.. Petroleum, crude oil or oil and hydrocarbons are sometimes used synonymously. Hydrocarbons are principle constituents of petroleum, related byproducts like coal tar, diesel, petrol, gasoline, kerosene and major environmental pollutants.

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Microbes Environ. Epub Feb 7. Most hydrocarbonoclastic bacteria in the total environment are diazotrophic, which highlights their value in the bioremediation of hydrocarbon contaminants. Eighty-two out of the hydrocarbonoclastic bacterial species that have been already isolated from oil-contaminated Kuwaiti sites, characterized by 16S rRNA nucleotide sequencing, and preserved in our private culture collection, grew successfully in a mineral medium free of any nitrogenous compounds with oil vapor as the sole carbon source.

Fifteen out of these 82 species were selected for further study based on the predominance of most of the isolates in their specific sites. All of these species tested positive for nitrogenase using the acetylene reduction reaction. The tested species also grew well and consumed crude oil effectively in NaNO3 -containing medium with and without nitrogen gas in the top space. On the other hand, these bacteria only grew and consumed crude oil in the NaNO3 -free medium when the top space gas contained nitrogen.

We concluded that most hydrocarbonoclastic bacteria are diazotrophic, which allows for their wide distribution in the total environment. Therefore, these bacteria are useful for the cost-effective, environmentally friendly bioremediation of hydrocarbon contaminants.

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Microbial biodegradation

E-mail: wk. Received Jun 19; Accepted Dec 5. This article has been cited by other articles in PMC. Abstract Eighty-two out of the hydrocarbonoclastic bacterial species that have been already isolated from oil-contaminated Kuwaiti sites, characterized by 16S rRNA nucleotide sequencing, and preserved in our private culture collection, grew successfully in a mineral medium free of any nitrogenous compounds with oil vapor as the sole carbon source. Fifteen out of these 82 species were selected for further study based on the predominance of most of the isolates in their specific sites. All of these species tested positive for nitrogenase using the acetylene reduction reaction. The tested species also grew well and consumed crude oil effectively in NaNO3 -containing medium with and without nitrogen gas in the top space.

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Hydrocarbonoklastische Bakterien

Aromatic compounds are among the most persistent of these pollutants and lessons can be learned from the recent genomic studies of Burkholderia xenovorans LB and Rhodococcus sp. These studies have helped expand our understanding of bacterial catabolism , non-catabolic physiological adaptation to organic compounds , and the evolution of large bacterial genomes. First, the metabolic pathways from phylogenetically diverse isolates are very similar with respect to overall organization. Thus, as originally noted in pseudomonads , a large number of "peripheral aromatic" pathways funnel a range of natural and xenobiotic compounds into a restricted number of "central aromatic" pathways. Nevertheless, these pathways are genetically organized in genus-specific fashions, as exemplified by the b-ketoadipate and Paa pathways.

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