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Characterization of phenol degradation byRhizobiumsp. CCNWTB 701 isolated fromAstragalus chrysopteruin mining tailing region

Authors
Journal
Journal of Hazardous Materials
0304-3894
Publisher
Elsevier
Publication Date
Volume
151
Issue
1
Identifiers
DOI: 10.1016/j.jhazmat.2007.05.058
Keywords
  • Rhizobium
  • Phenol
  • Biodegradation
  • Kinetic
  • Phylogeny

Abstract

Abstract To screen high strength phenol degrading bacteria, we selected 108 rhizobial strains isolated from nodules of eight wild legumes species in the mining tailing region of Shaanxi province, northwest of China, and cultivated them in a basal salt (BS) medium supplemented with different phenol concentrations as a sole carbon source. The results showed that some of the strains could use phenol as sole carbon source. In order to study the characteristics of phenol degradation, the strain CCNWTB701 isolated from Astragalus chrysopteru was used as well, due to the fact that it was very efficient in phenol degradation. The phenol degradation was around 99.5 and 78.3%, with an initial concentration of 900 and 1000 mg/l phenol in 62 and 66 h, respectively. Kinetic studies indicated that the strain had a high K S (743.1 μM) and an extremely high K SI (10,469 μM) in Haldane's model. The phylogenetic analysis based on 16S rRNA gene sequences showed that CCNWTB701 belonged to the Rhizobium genus, and it was closely related to Rhizobium mongolense and Rhizobium gallicum.

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