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Microbial biodegradation

About: Microbial biodegradation is a research topic. Over the lifetime, 1647 publications have been published within this topic receiving 75473 citations.


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01 Jan 2012
TL;DR: Biodegradation of diesel oil confirming naphthalene and it’s derivatives as major pollutants which are able to dissolve in water is confirmed by hydrocarbon dominated water table.
Abstract: In the present work we have studied degradation of diesel oil in oil-polluted soil. Oil-polluted soil culturing showed presence of variety of microorganisms. Hydrocarbon degrading potential of these microbes was confirmed and was identified. Acinetobacter sp, Bacillus sp., Micrococci sp., Pseudomonas sp. Streptomyces sp., and fungi Aspergillus sp, Trichoderma sp, Penicillin sp.were found part of hydrocarbon degrading microbial consortium. Analysis of extracted diesel oil was done using FTIR, HPLC, 1H NMR and GCMS techniques. It confirmed biodegradation of diesel oil confirming naphthalene and it’s derivatives as major pollutants which are able to dissolve in water. This further confirmed by hydrocarbon dominated water table.

25 citations

Journal ArticleDOI
Cheng Liu1, Jie Lu1, Jiaqi Liu1, Tariq Mehmood1, Wei Chen1 
TL;DR: The results suggested that the long-term accumulation of heavy metals in bioretention system would affect microbial degradation function and pollutants removal, causing the concern for theLong-term maintenance of the biorentention system.

25 citations

Journal ArticleDOI
TL;DR: Simple, inexpensive methodological modifications for quantifying microbial degradation of [C]benzene and 1,2-dichloro[U-C]ethane in calcareous soils under unsaturated conditions resulted in total CO(2) recovery efficiency of approximately 90%.
Abstract: Many techniques for quantifying microbial biodegradation of 14C-labeled compounds use soil-water slurries and trap mineralization-derived 14CO2 in solution wells suspended within the incubation flasks. These methods are not satisfactory for studies of arid-region soils that are highly calcareous and unsaturated because (i) slurries do not simulate unsaturated conditions and (ii) the amount of CO2 released from calcareous soils exceeds the capacity of the suspended well. This report describes simple, inexpensive methodological modifications for quantifying microbial degradation of [14C]benzene and 1,2-dichloro[U-14C]ethane in calcareous soils under unsaturated conditions. Soils at 50% water holding capacity were incubated with labeled contaminants for periods up to 10 weeks, followed by acidification of the soil and trapping of the evolved CO2 in a separate container of 2 N NaOH. The CO2 was transferred from the incubation flask to the trap solution by a gas transfer shunt containing activated charcoal to remove any volatilized labeled organics. The amount of 14CO2 in the trap solution was measured by scintillation counting (disintegrations per minute). The method was tested by using two regional unamended surface soils, a sandy aridisol and a clay-rich riparian soil. The results demonstrated that both [14C]benzene and 1,2-dichloro[U-14C]ethane were mineralized to release substantial amounts of 14CO2 within 10 weeks. Levels of mineralization varied with contaminant type, soil type, and aeration status (anaerobic vs. aerobic); no significant degradation was observed in abiotic control samples. Methodological refinements of this technique resulted in total 14CO2 recovery efficiency of approximately 90%.

24 citations

Journal ArticleDOI
TL;DR: A blown bitumen Mexphalte R 90/40 with a high content of saturated hydrocarbons was degraded by several microorganisms to the same extent and a direct distillation bitumen 80/100 with a low content ofaturated hydrocarbon and resins was more resistant to biodegradation.
Abstract: A blown bitumen Mexphalte R 90/40 with a high content of saturated hydrocarbons was degraded by several microorganisms to the same extent. In batch cultures ofSaccharomycopsis lipolytica, maximal biodegradation was estimated to be about 9% w/w, 3.2·10−3 g/cm2 and 3.1·10−3 cm of degraded bitumen. The Mexphalte R 90/40 degradation rate was closely coupled to biofilm formation. The microbial activity concerned predominantly the oxidation of saturated hydrocarbons. A direct distillation bitumen 80/100 with a low content of saturated hydrocarbons and a high content of aromatic hydrocarbons and resins was more resistant to biodegradation.

24 citations

Journal ArticleDOI
TL;DR: A first draft of the 44.2 Mbp genome assembly of an environmental strain of the fungus Scedosporium apiospermum is reported, showing important differences in terms of annotated genes involved in the hydrocarbon degradation process.
Abstract: Crude oil contamination of soils and waters is a worldwide problem, which has been actively addressed in recent years. Sequencing genomes of microorganisms involved in the degradation of hydrocarbons have allowed the identification of several promoters, genes, and degradation pathways of these contaminants. This knowledge allows a better understanding of the functional dynamics of microbial degradation. Here, we report a first draft of the 44.2 Mbp genome assembly of an environmental strain of the fungus Scedosporium apiospermum. The assembly consisted of 178 high-quality DNA scaffolds with 1.93% of sequence repeats identified. A total of 11,195 protein-coding genes were predicted including a diverse group of gene families involved in hydrocarbon degradation pathways like dioxygenases and cytochrome P450. The metabolic pathways identified in the genome can potentially degrade hydrocarbons like chloroalkane/alkene, chorocyclohexane, and chlorobenzene, benzoate, aminobenzoate, fluorobenzoate, toluene, caprolactam, geraniol, naphthalene, styrene, atrazine, dioxin, xylene, ethylbenzene, and polycyclic aromatic hydrocarbons. The comparison analysis between this strain and the previous sequenced clinical strain showed important differences in terms of annotated genes involved in the hydrocarbon degradation process.

24 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
202366
2022153
202172
202068
201962