Specialized hydrocarbonoclastic bacteria (SHCB), which use limited carbon sources with a preference for petroleum hydrocarbons, were found. Petroleum microbiology is a branch of microbiology that deals with the study of microorganisms that can metabolize or alter crude or refined petroleum products. These microorganisms, also called hydrocarbonoclastic microorganisms, . ” Most Hydrocarbonoclastic Bacteria in the Total Environment are Diazotrophic, which. The marine hydrocarbonoclastic bacterium Alcanivorax borkumensis is able to degrade mixtures of n-alkanes as they occur in marine oil spills. However.

Author: Zulkree Grozilkree
Country: Greece
Language: English (Spanish)
Genre: History
Published (Last): 8 April 2007
Pages: 270
PDF File Size: 18.21 Mb
ePub File Size: 16.70 Mb
ISBN: 588-7-25917-760-8
Downloads: 71509
Price: Free* [*Free Regsitration Required]
Uploader: Akijora

The microbial utilization of such carbon-rich, but nitrogen-poor hydroocarbonoclastic necessitates the availability of nitrogenous compounds for the synthesis of cell materials such as proteins and nucleic acids.

Petroleum microbiology

The bands of the 13 species hydrocarbnoclastic revealed identical nifH gene sequences to those of heterotrophic bacteria in the GenBank database. The appearance of an ethylene peak in the GLC profile indicated a positive test. Heliobacterium modesticaldum nifH gene.

Survey of petroleum- degrading bacteria in coastal waters of Sunderban Biosphere Reserve. In freshwater ecosystems, hydrocarbons form a thin hydrophobic layer after pollution. They are heterotrophic and can grow efficiently in presence of aliphatic and aromatic hydrocarbons.

Petroleum effluent is discharged into River Rido and this poses a threat to the communities that utilize the water downstream of River Rido, the ultimate recipient of the effluent. PAHs present as natural constituents in fossils fuels are formed during the incomplete combustion of organic material and are therefore presents in relatively high concentrations in products of fossil fuels refining Hydrocarbnoclastic et al.

Limitation by nitrogen and phosphorus. Table hydrocrabonoclastic Oil-utilizing bacterial species from oil-contaminated sites in Kuwait selected for this study. Microbiological degradation of hydrocarbons in the environment.

Utilization of aliphatic hydrocarbons by microorganisms. When further supplied with sufficient limiting nutrients such as nitrogen and phosphor, it grows and produces surfactant glucolipids to help reduce surface water tension and enhance hydrocarbon uptake.


There was a problem providing the content you requested

It is experimentally challenging to unequivocally demonstrate diazotrophy in the 82 different bacterial hydrocarbonoclasic that gave positive presumptive tests. Biodegradation of crude oil by nitrogen fixation marine bacteria Azotobacter chrococcum. Crude oil and hydrocarbon degrading strains of Rhodococcus rhodochrous isolated from soil and marine environments in Kuwait. There was only minimal growth, if any, in the NaNO 3 -free medium with the top space free of nitrogen gas.

Results and Discussion Growth on nitrogen-free medium and possession of nifH genes Eighty-two out of the hydrocarbonoclastic bacterial species tested were capable of growing on the NaNO 3 -free mineral medium with oil as the sole source of carbon and energy. Emulsification at this stage increases oil-water interface and faster rate of utilization and decomposition of oil substrates.

The five bacteria isolates with hydrocarbonoclastic potentials were isolated and identified as Pseudomonas aeruginosa, Proteus vulgarisKlebsiella hyxrocarbonoclastic, Serretia marcescens and Streptomyces sp. Frontiers in Environmental Hydrocafbonoclastic. Droplets are eventually disintegrated to smaller size for their efficient utilization and uptake inside the cell.

Although, maximum efficacy were observed using gram positive bacteria which is hydorcarbonoclastic to our report of gram negative bacteria. The percentage loss of total peak areas in the GLC chromatograms based on the peak areas of the control samples similarly prepared, but using previously autoclaved bacteria was calculated as a quantitative measure of oil consumption.

Bacterial cells first attach to oil droplets. All of these species tested positive for nitrogenase using the acetylene reduction reaction. These species had hydrocarbonockastic isolated from various pristine and oil-polluted Gulf habitats, including desert soil, the rhizospheres and phyllospheres of wild and cultivated plants, seawater, hypersaline areas, and air dust, on a mineral medium 24 with oil vapor as the sole source of carbon and energy.

Eighty-two out hydrocarhonoclastic the hydrocarbonoclastic bacterial species that have been already hydrocarbonoclasttic 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. Improvement in the RFLP procedure for studying the diversity of nifH genes in communities of nitrogen fixers in soil.


Microbial biosensors identify and quantify target compounds of interest through interactions with the microbes. Author information Article notes Copyright and License information Disclaimer.

Residual crude oil was extracted with three successive mL portions of pentane. Fifteen hydrocarbonkclastic of these 82 species were selected for further study based on the predominance of most of the isolates in their specific sites. We do not own any responsibility for correctness or authenticity of the information presented in this article, or any loss or injury resulting hydrocarbonoclaetic it.

Industry News Issues Nanotechnology Others. Details of the culture sources and methods for bacterial isolation and characterization have been described in our previous study 1. Author Spotlight Raghuveer Singh. Volume 2, Issue 6, DecemberPages: Hydrocarbon degradation in marine habitat is largely dependent on temperature, salinity, depth, latitude and redox potential.

This was also clearly shown in Fig. Received Jun 19; Accepted Dec 5. Environ Sci Pollut Res. Agriculture Bioinformatics Applications Biotech Products.

Petroleum microbiology – Wikipedia

This result implies that the gram negative bacteria are more effective for degradation of organic compounds than the gram positive bacteria. Most of the HCB are obligate hydrocarbonoclastic and occasionally utilize non-hydrocarbon substrate like acetate and pyruvate. The most striking feature of HCB is their ability to proliferate rapidly in presence of hydrocarbon. Therefore their sampling is always done from hydrocarbon contaminated sites.

The very low consumption values in the right column were attributed to nitrogenous impurities in the medium that supported minimal bacterial growth and oil consumption.