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# Temperature-dependent electrical characterization shows thermally activated charge transport. (A) The conductivity σ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sigma$$\end{document} of intact filaments and fibre sheaths show a linear relation with the inverted thermal energy 1/kT\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$1/{kT}$$\end{document}, thus following an Arrhenius behaviour with activation energy in the range of 40–50 meV. (B) Independent measurements of the impedance response as a function of temperature confirm this result. The similarity in the semicircle for every temperature implies the thermal activation only to be present in the (bulk) parallel resistance. (C) When fitted to an (RC) circuit, the parallel resistance Rp\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{R}}_{{p}}$$\end{document} shows a similar thermal activation as found in (A), while the capacitance Cp\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${C}_{{p}}$$\end{document} remained constant as a function of temperature.

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Abstract Filamentous cable bacteria exhibit long-range electron transport over centimetre-scale distances, which takes place in a parallel fibre structure with high electrical conductivity. Still, the underlying electron transport mechanism remains undisclosed. Here we determine the intrinsic electrical properties of the conductive fibres in cable...

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... 48 Copyright 2018 Elsevier Ltd. (C) Illustration depicting cable bacteria possessing parallel conductive fibers in their cell envelope. Adapted with permission from Bonnéet al. 49 Copyright 2020 Springer Nature. (D) Scheme highlighting the extracellular electron transport (EET) and long-distance electron transport in cable bacteria. ...
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