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Updated: May 22, 2026

Characterizing Electron Transport through Living Biofilms
08:52

Characterizing Electron Transport through Living Biofilms

Published on: June 1, 2018

On electron transport through Geobacter biofilms.

Daniel R Bond1, Sarah M Strycharz-Glaven, Leonard M Tender

  • 1BioTechnology Institute and Department of Microbiology, University of Minnesota, St. Paul, MN 55108, USA.

Chemsuschem
|May 23, 2012
PubMed
Summary

Geobacter biofilms form thick, electrically conductive structures on anodes. Electron superexchange, a mechanism involving outer membrane cytochromes and pili, explains how these microbes transfer electrons and achieve high catalytic activity.

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Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization
11:58

Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Published on: December 29, 2013

Area of Science:

  • Microbial electrochemistry
  • Bioenergetics
  • Extracellular electron transfer

Background:

  • Geobacter species form thick biofilms on anodes, using them as electron acceptors for respiration.
  • Understanding electron transport through these biofilms and across the biofilm-anode interface is crucial for microbial fuel cells and bioelectronics.
  • Key questions involve the mechanisms of electron transfer, biofilm thickness limits, and catalytic activity.

Purpose of the Study:

  • To elucidate the mechanism of extracellular electron transfer (EET) in Geobacter biofilms.
  • To explain how electrons are transported through thick biofilms and across the biofilm-anode interface.
  • To account for the observed upper limits in biofilm thickness and catalytic activity.

Main Methods:

  • Review and synthesis of existing experimental evidence.
  • Focus on the proposed 'electron superexchange' mechanism.
  • Analysis of the role of cytochromes, extracellular polymeric substances, and pili in electron transport.

Main Results:

  • Electron superexchange is proposed as the primary mechanism for EET in Geobacter biofilms.
  • This mechanism involves electron transfer through a network of outer membrane cytochromes, extracellular polymeric substances, and pili.
  • Electron superexchange can explain experimental observations regarding electron transport, biofilm thickness, and catalytic current.

Conclusions:

  • Electron superexchange provides a unifying framework for understanding EET in Geobacter biofilms.
  • This mechanism accounts for the efficient transfer of electrons through thick biofilms to the anode.
  • The superexchange model helps explain the limitations on biofilm thickness and catalytic performance.