| Literature DB >> 11099408 |
M Labrenz1, G K Druschel, T Thomsen-Ebert, B Gilbert, S A Welch, K M Kemner, G A Logan, R E Summons, G De Stasio, P L Bond, B Lai, S D Kelly, J F Banfield.
Abstract
Abundant, micrometer-scale, spherical aggregates of 2- to 5-nanometer-diameter sphalerite (ZnS) particles formed within natural biofilms dominated by relatively aerotolerant sulfate-reducing bacteria of the family Desulfobacteriaceae. The biofilm zinc concentration is about 10(6) times that of associated groundwater (0.09 to 1.1 parts per million zinc). Sphalerite also concentrates arsenic (0.01 weight %) and selenium (0.004 weight %). The almost monomineralic product results from buffering of sulfide concentrations at low values by sphalerite precipitation. These results show how microbes control metal concentrations in groundwater- and wetland-based remediation systems and suggest biological routes for formation of some low-temperature ZnS deposits.Entities:
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Year: 2000 PMID： 11099408 DOI： 10.1126/science.290.5497.1744
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728