⚠⚠⚠ Attention ⚠⚠⚠: Le dépôt institutionnel Papyrus sera indisponible le 2 décembre 2022 en raison de travaux majeurs d’électrification sur le campus. ⚠⚠⚠Please note ⚠⚠⚠: The Papyrus Institutional Repository will be unavailable on December 2, 2022 due to major electrification work on campus.

Show item record

dc.contributor.authorLeclerc, Maxime
dc.contributor.authorPlanas, Dolors
dc.contributor.authorAmyot, Marc
dc.date.accessioned2020-04-06T15:40:50Z
dc.date.availableNO_RESTRICTIONfr
dc.date.available2020-04-06T15:40:50Z
dc.date.issued2015-05-26
dc.identifier.urihttp://hdl.handle.net/1866/23197
dc.publisherAmerican chemical Societyfr
dc.subjectThiolfr
dc.subjectMercuryfr
dc.subjectMethylmercuryfr
dc.subjectPeriphytonfr
dc.subjectBiofilmfr
dc.subjectLakefr
dc.titleRelationship between extracellular low-molecular-weight thiols and mercury species in natural lake periphytic biofilmsfr
dc.typeArticlefr
dc.contributor.affiliationUniversité de Montréal. Faculté des arts et des sciences. Département de sciences biologiquesfr
dc.identifier.doi10.1021/es505952x
dcterms.abstractThe uptake of mercury by microorganisms is a key step in the production of methylmercury, a biomagnifiable toxin. Mercury complexation by low molecular weight (LMW) thiols can affect its bioavailability and thus the production of methylmercury. Freshwater biofilms were sampled in the summer using artificial Teflon substrates submerged for over a year to allow natural community colonization in the littoral zone of a Boreal Shield lake. Inside biofilms, concentrations of different extracellular thiol species (thioglycolic acid, L-cysteine-L-glycine, cysteine, and glutathione) were up to three orders of magnitude greater than in the surrounding water column, potentially more readily controlling mercury speciation than in water column. All biofilm thiols except thioglycolic acid were highly correlated to chlorophyll a, likely indicating an algal origin. Extracellular total mercury represented 3 ± 1% of all biofilm mercury and was preferentially found in the capsular fraction. Levels of LMW thiols of presumed algal origins were highly correlated with total mercury in the mobile colloidal fraction of biofilms. We propose that periphytic phototrophic microorganisms such as algae likely affect the bioavailability of mercury through the exudation of LMW thiols, and thus they may play a key role in the production of methylmercury in biofilms.fr
dcterms.isPartOfurn:ISSN:0013-936Xfr
dcterms.isPartOfurn:ISNN:1520-5851fr
dcterms.languageengfr
UdeM.ReferenceFournieParDeposanthttps://pubs.acs.org/doi/pdf/10.1021/es505952xfr
UdeM.VersionRioxxVersion acceptée / Accepted Manuscriptfr
oaire.citationTitleEnvironmental science and technology
oaire.citationVolume49
oaire.citationIssue13
oaire.citationStartPage7709
oaire.citationEndPage7716


Files in this item

Microsoft Word
Microsoft Word

This item appears in the following Collection(s)

Show item record


DSpace software [version 5.8 XMLUI], copyright © 2002-2015  DuraSpace