title: The decolorisation capacity and mechanism of Shewanella oneidensis MR-1 for methyl orange and acid yellow 199 under microaerophilic conditions.
abstract: Shewanella oneidensis MR-1 was found to reach 99.36% and 78.25% decolorisation for Methyl Orange and Acid Yellow 199 in solutions, respectively. The suitable pH range for decolorisation of Methyl Orange and Acid Yellow 199 by S. oneidensis MR-1 was 4.0-7.0 and 6.0-8.0, respectively, The azo dyes' removal by S. oneidensis MR-1 was slightly enhanced by addition of Mg(2+), but inhibited by Pb(2+), Cd(2+), Cu(2+), Fe(3+) and Fe(2+). The enzyme activities of NADH-DCIP reductase and azoreductase were 2.67 and 3.0 times higher, and 1.92 and 2.48 times higher, respectively, in the Methyl Orange treatment and in the Acid Yellow 199 treatment as compared to the control treatment. These findings indicated that the azo dyes' decolorisation by S. oneidensis MR-1 was via reduction mechanism.
authors.affiliation: College of life science, Zhejiang University, Hangzhou 310058, China. jinxiuchuanyang@gmail.com
authors.forename: Y Y
authors.initials: YY
authors.lastname: Yang
authors.forename: L N
authors.initials: LN
authors.lastname: Du
authors.forename: G
authors.initials: G
authors.lastname: Wang
authors.forename: X M
authors.initials: XM
authors.lastname: Jia
authors.forename: Y H
authors.initials: YH
authors.lastname: Zhao
mesh_terms: D001391:Azo Compounds / Q000737:chemistry / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism; D001673:Biodegradation, Environmental; D002474:Cell-Free System; D004396:Coloring Agents / Q000737:chemistry / Q000378:metabolism; D008670:Metals / Q000737:chemistry / Q000378:metabolism; D015394:Molecular Structure; D020592:Shewanella / Q000201:enzymology / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*
chemical_list: D001391:Azo Compounds; D001426:Bacterial Proteins; C559525:C.I. acid yellow 199; D004396:Coloring Agents; D008670:Metals; D014874:Water Pollutants, Chemical; C100258:methyl orange