Recent Advances in Biodegradative Mechanism of Polycyclic Aromatic Hydrocarbons by Aerobic Bacteria
- VernacularTitle:好氧细菌对多环芳烃降解机制的研究进展
- Author:
Bai-Suo ZHAO
;
Hui WANG
;
Rui-Rui LI
;
Xin-Wei MAO
;
- Publication Type:Journal Article
- Keywords:
Polycyclic aromatic hydrocarbons, Biodegradation, Genes of PAHs metabolism
- From:
Microbiology
1992;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
Polycyclic aromatic hydrocarbons (PAHs), which consist of two or more fused aromatic rings, are ubiquitous pollutants in the environment, and are of concern because of their toxic and carcinogenic poten- tial. In nature, the aerobic bacterial bio-treatment of contamination with PAHs is of the major route. It is ob- vious that the degraders are more useful for the bioremediation of contaminated environments and may be potentially used in a wide of application. Therefore, many researchers have been focusing on the biodegra- dations of PAHs by various aerobic bacteria. In the last two decades, the mechanism of degradation in bacte- ria capable of aero-biotic utilizing PAHs has been well investigated in genetic studies such as diversities of genes of PAHs metabolism, the genes which participate directly in PAHs metabolism and the genetics me- chanism of bacterial population and so on. In brief, most of PAH-catabolic genes are classed into two groups according to their identity. One group is called "the nah-like genes", the other group, i.e. "the nah-unlike genes" is different from the nah-like genes. The different molecular genetics mechanisms of bacterial popu- lation adapted to PAH compound will be dealt with in three groups: (i) point mutations, (ii) gene transfer, and (iii) DNA rearrangements and absentation. In this review, some genetic knowledge about aerobic bacte- ria with the mechanism for the degradation of PAHs is summarized.
