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Variation in electrode redox potential selects for different microorganisms under cathodic current flow from electrodes in marine sediments.

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Title: Variation in electrode redox potential selects for different microorganisms under cathodic current flow from electrodes in marine sediments.
Authors: Lam, Bonita R.1 bonitarl@usc.edu, Rowe, Annette R.2, Nealson, Kenneth H.1,3
Source: Environmental Microbiology. Jun2018, Vol. 20 Issue 6, p2270-2287. 18p.
Subjects: Electrodes, Marine sediments, Electron transport, Biofilms, Campylobacter
Abstract: Summary: Extracellular electron transport (EET) is a microbial process that allows microorganisms to transport electrons to and from insoluble substrates outside of the cell. Although progress has been made in understanding how microbes transfer electrons to insoluble substrates, the process of receiving electrons has largely remained unexplored. We investigated redox potentials favourable for donating electrons to dissolved and insoluble components in Catalina Harbor marine sediment by combining electrochemical techniques with geochemistry and molecular methods. Working electrodes buried in sediment microcosms were poised at seven redox potentials between −300 and −750 mV versus Ag/AgCl using a three‐electrode system. In electrode biofilms recovered after 2‐month incubations, overall community diversity increased with more negative redox potentials. Abundances of known EET‐capable groups (e.g., Alteromonadales and Desulfuromonadales) varied with redox potential. Motility and chemotaxis genes were found in greater abundance in electrode communities, suggesting a possible selective advantage of these pathways for colonization and utilization of the electrode. Our enrichments demonstrated the validity of this approach in capturing groups known, as well as novel groups (e.g., Campylobacterales) that perform EET. The diverse nature of the enriched cathode communities suggest that insoluble substrate oxidation may be a critical, although poorly described microbial metabolic process in marine sediment. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Microbiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 131298417
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Variation in electrode redox potential selects for different microorganisms under cathodic current flow from electrodes in marine sediments.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Lam%2C+Bonita+R%2E%22">Lam, Bonita R.</searchLink><relatesTo>1</relatesTo><i> bonitarl@usc.edu</i><br /><searchLink fieldCode="AR" term="%22Rowe%2C+Annette+R%2E%22">Rowe, Annette R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Nealson%2C+Kenneth+H%2E%22">Nealson, Kenneth H.</searchLink><relatesTo>1,3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Environmental+Microbiology%22">Environmental Microbiology</searchLink>. Jun2018, Vol. 20 Issue 6, p2270-2287. 18p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Electrodes%22">Electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Marine+sediments%22">Marine sediments</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+transport%22">Electron transport</searchLink><br /><searchLink fieldCode="DE" term="%22Biofilms%22">Biofilms</searchLink><br /><searchLink fieldCode="DE" term="%22Campylobacter%22">Campylobacter</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Summary: Extracellular electron transport (EET) is a microbial process that allows microorganisms to transport electrons to and from insoluble substrates outside of the cell. Although progress has been made in understanding how microbes transfer electrons to insoluble substrates, the process of receiving electrons has largely remained unexplored. We investigated redox potentials favourable for donating electrons to dissolved and insoluble components in Catalina Harbor marine sediment by combining electrochemical techniques with geochemistry and molecular methods. Working electrodes buried in sediment microcosms were poised at seven redox potentials between −300 and −750 mV versus Ag/AgCl using a three‐electrode system. In electrode biofilms recovered after 2‐month incubations, overall community diversity increased with more negative redox potentials. Abundances of known EET‐capable groups (e.g., Alteromonadales and Desulfuromonadales) varied with redox potential. Motility and chemotaxis genes were found in greater abundance in electrode communities, suggesting a possible selective advantage of these pathways for colonization and utilization of the electrode. Our enrichments demonstrated the validity of this approach in capturing groups known, as well as novel groups (e.g., Campylobacterales) that perform EET. The diverse nature of the enriched cathode communities suggest that insoluble substrate oxidation may be a critical, although poorly described microbial metabolic process in marine sediment. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Environmental Microbiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1111/1462-2920.14275
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 18
        StartPage: 2270
    Subjects:
      – SubjectFull: Electrodes
        Type: general
      – SubjectFull: Marine sediments
        Type: general
      – SubjectFull: Electron transport
        Type: general
      – SubjectFull: Biofilms
        Type: general
      – SubjectFull: Campylobacter
        Type: general
    Titles:
      – TitleFull: Variation in electrode redox potential selects for different microorganisms under cathodic current flow from electrodes in marine sediments.
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            NameFull: Lam, Bonita R.
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            NameFull: Rowe, Annette R.
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            NameFull: Nealson, Kenneth H.
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            – D: 01
              M: 06
              Text: Jun2018
              Type: published
              Y: 2018
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              Value: 20
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              Value: 6
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            – TitleFull: Environmental Microbiology
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