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dc.contributor.authorZhang, Ping
dc.contributor.authorVan Nostrand, Joy D.
dc.contributor.authorHe, Zhili
dc.contributor.authorChakraborty, R.
dc.contributor.authorDeng, Ye
dc.contributor.authorCurtis, Daniel
dc.contributor.authorFields, Matthew W.
dc.contributor.authorHazen, Terry C.
dc.contributor.authorArkin, Adam P.
dc.contributor.authorZhou, Jizhong
dc.identifier.citationZhang P, Van Nostrand JD, He Z, Chakraborty R, Deng Y, Curtis D, Fields M, Hazen TC, Arkin AP, Zhou J, "A slow-release substrate stimulates groundwater microbial communities for long-term in-situ Cr(VI) reduction," Environ Sci Technol. 2015 Nov 3 49(21):12922–31.en_US
dc.description.abstractCr(VI) is a widespread environmental contaminant that is highly toxic and soluble. Previous work indicated that a one-time amendment of polylactate hydrogen-release compound (HRC) reduced groundwater Cr(VI) concentrations for >3.5 years at a contaminated aquifer; however, microbial communities responsible for Cr(VI) reduction are poorly understood. In this study, we hypothesized that HRC amendment would significantly change the composition and structure of groundwater microbial communities, and that the abundance of key functional genes involved in HRC degradation and electron acceptor reduction would increase long-term in response to this slowly degrading, complex substrate. To test these hypotheses, groundwater microbial communities were monitored after HRC amendment for >1 year using a comprehensive functional gene microarray. The results showed that the overall functional composition and structure of groundwater microbial communities underwent sequential shifts after HRC amendment. Particularly, the abundance of functional genes involved in acetate oxidation, denitrification, dissimilatory nitrate reduction, metal reduction, and sulfate reduction significantly increased. The overall community dynamics was significantly correlated with changes in groundwater concentrations of microbial biomass, acetate, NO3–, Cr(VI), Fe(II) and SO42–. Our results suggest that HRC amendment primarily stimulated key functional processes associated with HRC degradation and reduction of multiple electron acceptors in the aquifer toward long-term Cr(VI) reduction.en_US
dc.description.sponsorshipOffice of the Vice President for Research, University of Oklahoma; Basic Energy Sciences (DE-AC02-05CH11231, DE-FG02-07ER64398)en_US
dc.titleA slow-release substrate stimulates groundwater microbial communities for long-term in-situ Cr(VI) reductionen_US
mus.citation.journaltitleEnvironmental Science & Technologyen_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.categoryHealth & Medical Sciencesen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentCivil Engineering.en_US
mus.relation.departmentEnvironmental Engineering.en_US
mus.relation.departmentHealth & Human Development.en_US
mus.relation.departmentMicrobiology & Immunology.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.contributor.orcidFields, Matthew W.|0000-0001-9053-1849en_US

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