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Title of Journal: World J Microbiol Biotechnol

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Abbravation: World Journal of Microbiology and Biotechnology

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Springer Netherlands

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DOI

10.1002/app.30569

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1573-0972

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Aerobic biodegradation of methyl Emphasis Type="I

Authors: LN MuñozCastellanos JV TorresMuñoz A KeerRendón LI ManzanaresPapayanopoulos GV NevárezMoorillón
Publish Date: 2006/01/21
Volume: 22, Issue: 8, Pages: 851-855
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Abstract

Methyl tertButyl Ether MTBE has been used in gasoline as a substitute for leadbased additives which have been demonstrated to be toxic MTBE however is persistent in soil and water showing high affinity for water and low affinity for soil and has become an important contaminant Therefore the aim of this work was to isolate and identify soil microorganisms capable of degrading MTBE Two samples were taken from a gasolinecontaminated soil at a service station and 59 different bacterial strains were isolated by enrichment culture with three consecutive selective transfers Biochemical and morphological characterization of the bacterial isolates classified them into the following groups Bacillus Rhodococcus Micrococcus Aureobacterium and Proteus Twelve strains were selected for evaluation of MTBE biodegradation depending on visual growth and biomass production of the isolates in minimal salt broth Six strains significantly reduced MTBE concentration 22–37 compared to an abiotic control after 5 days of incubation Although it has been considered that MTBE is degraded mainly by cometabolism our results demonstrate that these microorganisms are able to reduce MTBE concentration when MTBE is the sole source of carbonThis work was supported by SIVILLACONACYT grant No 19990406018 LN MuñozCastellanos was a doctoral student supported by CONACYT México The authors would like to thank Ma Lourdes Ballinas C and the anonymous reviewers for their valuable comments on the manuscript

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