title: Change of bacterial communities in sediments along Songhua River in Northeastern China after a nitrobenzene pollution event.
abstract: More than 100 tons of nitrobenzene and related compounds were released into Songhua River due to the explosion of an aniline production factory in November, 2005. Sediment samples were taken from the heavily polluted drainage canal, one upstream and three downstream river sites. The change of bacterial community structures along the river was studied by denaturing gradient gel electrophoresis (DGGE) and cloning and sequencing of 16S rRNA genes with five clone libraries constructed and 101 sequences acquired representing 172 clones. Both DGGE profiles and sequences of 16S rRNA genes from clone libraries demonstrated that the contaminated drainage canal and three downstream river sites were similar in that all had Betaproteobacteria, mainly grouped into Comamonadaceae, as the dominant group of bacteria, and all had Firmicutes, primarily as Clostridium spp. These results suggest that these latter two groups of bacteria may play potential roles in degradation and detoxification of nitrobenzene in the present contaminated river environments.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.forename: Zonglai
authors.initials: Z
authors.lastname: Li
authors.forename: Rong
authors.initials: R
authors.lastname: Qi
authors.forename: Jizheng
authors.initials: J
authors.lastname: He
authors.forename: Huijuan
authors.initials: H
authors.lastname: Liu
mesh_terms: D001419:Bacteria / Q000235:genetics* / Q000378:metabolism; D001673:Biodegradation, Environmental; D002681:China; D004269:DNA, Bacterial / Q000235:genetics; D016521:Electrophoresis, Gel, Pulsed-Field; D015723:Gene Library; D005798:Genes, Bacterial; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D008969:Molecular Sequence Data; D009578:Nitrobenzenes / Q000378:metabolism*; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D045483:Rivers / Q000382:microbiology*; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D004269:DNA, Bacterial; D009578:Nitrobenzenes; D012336:RNA, Ribosomal, 16S; D014874:Water Pollutants, Chemical; C036077:nitrobenzene