On the low-frequency electrical polarization of bacterial cells in sands

Dimitrios Ntarlagiannis, N. Yee, L. Slater

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    40 Citations (Scopus)


    We performed electrical measurements on sands flushed with bacterial suspensions of varying concentration. The first experiment was conducted with Shewanella putrefaciens (biomass 0â??0.5 mg/L) and the second with Escherichia coli (biomass 0â??42 mg/L). We measured a biomass-dependent low-frequency (10 Hz) polarization. At cell density 12 mg/L polarization increased (up to 15%). We attribute the decrease in polarization at low cell density to alteration of the mineral-fluid interface due to mineral-cell interactions. The polarization enhancement at higher cell density is possibly a pore throat mechanism resulting from decreased ionic mobility and/or electron transfer due to cell accumulation in pores.
    Original languageEnglish
    Pages (from-to)L24402(1)-L24402(4)
    Number of pages4
    JournalGeophysical Research Letters
    Issue number24
    Publication statusPublished - 28 Dec 2005

    ASJC Scopus subject areas

    • Earth and Planetary Sciences (miscellaneous)


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