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    Selective dissolution of iron minerals in acid mine drainage and iron-oxidizing microbial communities for the purpose of measuring nanowire conductivity

    Author
    Agar, Janie
    View/Open
    177239_Agar_rpi_0185N_10870.pdf (1.904Mb)
    Other Contributors
    Gorby, Yuri; Nyman, Marianne; Kilduff, James;
    Date Issued
    2016-05
    Subject
    Environmental engineering
    Degree
    MS;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/20.500.13015/1667
    Abstract
    Similar structures were detected in neutrophilic iron-oxidizing cultures that were treated with 200 mM ammonium oxalate solution to gently dissolve biogenic minerals that would otherwise obscure visualization of the biological filaments. Samples prepared by these methods appear to be of sufficient quality to be analyzed for conductivity using established scanning tunneling or conductive atomic form microscopy. If these structures prove conductive, this would represent the first confirmation of electrically conductive appendages in iron oxidizing microbial systems.; A laboratory system was designed to generate microbial biofilms from a variety of iron oxidizing communities. Microbial communities of acid mine drainage can be induced to dissolve their mineral phases with the addition of a readily usable electron donor, such as dextrose, in the absence of oxygen. Mineral dissolution in acid mine drainage cultures exposes several features previously hidden within the iron phases of the culture. Scanning electron microscopic evidence revealed the presence of extracellular appendages that morphologically resemble electrically conductive “bacterial nanowires” produced by a number of iron reducing microbes, such as Shewanella oneidensis.;
    Description
    May 2016; School of Engineering
    Department
    Dept. of Civil and Environmental Engineering;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
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