AI Article Synopsis
- Carbazole is a harmful nitrogen heterocyclic compound found in the environment, and this research isolated seven bacterial strains from activated sludge that can use it as their sole carbon, nitrogen, and energy source.
- These strains were able to efficiently degrade 500 mg/L of carbazole within 36 hours and were identified as different species of the genus Pseudomonas through DNA sequencing.
- The bacterial strains not only carried the car gene related to carbazole degradation but also showed denitrification abilities, making them potential candidates for bioremediation of carbazole-contaminated environments.
Article Abstract
Carbazole, one representative of non-alkaline nitrogen heterocyclic compounds, is widespread in the natural environment and harmful to human health. In this research, the seven bacterial strains using carbazole as their sole carbon, nitrogen and energy source were isolated from activated sludge of a coking wastewater treatment plant. All strains efficiently degraded 500 mg/L of carbazole in the medium within 36 h. Based on the DNA sequence and phylogenetic tree analysis, the seven strains were identified as the genera Pseudomonas with different evolutionary pathways. PCR analysis revealed that the seven isolates carried the car gene. Moreover, all of these strains could utilize and transform ammonium and nitrate efficiently, and the six strains except BC043 strain coded the nitrite reductase gene (nirS) and the nitrous oxide reductase (nosZ), that indicated their denitrification ability. All these strains may be useful in the bioremediation of environments contaminated by carbazole.
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| http://dx.doi.org/10.1016/j.jhazmat.2011.03.036 | DOI Listing |
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