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1、Geobiology(2007),5,191–205DOI:10.1111/j.1472-4669.2007.00112.xCalciteanddolomitedissolutionratesinthecontextofORIGINALARTICLESCarbonatedissolutionduringmicrobialattachmentBlackwellPublishingLtdmicrobe–mineralsurfaceinteractionsK.J.DAVIS,1K.H.NEALSON2
2、ANDA.LÜTTGE1,3,41DepartmentofEarthScience,MS-126,RiceUniversity,6100MainStreet,Houston,Texas77005,USA2DepartmentofEarthSciences,UniversityofSouthernCalifornia,MailCode0740,LosAngeles,CA90089-0740,USA3DepartmentofChemistry,RiceUniversity,6100MainStree
3、t,Houston,Texas77005,USA4CenterforBiologicalandEnvironmentalNanotechnology,RiceUniversity,Houston,Texas77005,USAABSTRACTAlthoughmicrobeshavebeenshowntoalterthedissolutionrateofcarbonateminerals,amechanisticunder-standingoftheconsequencesofmicrobialsu
4、rfacecolonizationoncarbonatedissolutionhasyettobeachieved.Herewereporttheuseofverticalscanninginterferometry(VSI)tostudytheeffectofShewanellaoneidensisMR-1surfacecolonizationonthedissolutionratesofcalcite(CaCO3)anddolomite(CaMg(CO3)2)throughqualitati
5、veanalysisofetchpitdevelopmentandquantitativemeasurementsofsurface-normaldissolutionrates.Byquantifyingandcomparingthesignificantprocessesoccurringatthemicrobe–mineralinterface,thedominantmechanismofmineraldissolutionduringsurfacecolonizationwasdeterm
6、ined.MR-1attachmentunderaerobicconditionswasfoundtoinfluencecarbonatedissolutionthroughtwodistinctmechanisticpathways:(1)inhibitionofcarbonatedissolutionthroughinterferencewithetchpitdevelopmentand(2)excavationofcarbonatematerialatthecell–mineralinter
7、faceduringirreversibleattachmenttothemineralsurface.Therelativeimportanceofthesetwocompetingeffectswasfoundtovarywiththesolubilityofthecarbonatemineralstudied.Forthefaster-dissolvingcalcitesubstrates,inhibitionofdissolutionbyattachmentandsubsequentex
8、tracellularpolysaccharide(EPS)productionwasthedominanteffectassociatedwithMR-1surfacecolonization.Thisinter-ferencewithetchpitdevelopmentresultedina40–70%decreaseinthesurfacenormaldissolutionraterelativetocell-freecontrols,dependingprimarilyontheconc
