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Hydrated Cable Bacteria Exhibit Protonic Conductivity Over Long Distances

T0 review · 3 major / 5 minor · reviewed 2026-08-10 · deepseek-v4-flash

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Pith's one-line read Hydrated cable bacteria transport protons over distances greater than 100 micrometers, acting as protonic conductors alongside their established electronic conductivity.

desk verdict First credible measurement of protonic conductivity in cable bacteria, with strong controls; the qualitative claim holds up, but the headline conductivity numbers rest on an unvalidated cross-section assumption and the abstract overstates the mechanism. read the letter →

arxiv 2501.18651 v1 pith:F6EST5WZ submitted 2025-01-30 physics.bio-ph cond-mat.mtrl-scicond-mat.softq-bio.BM

Bradley G. Lusk , Sheba Morgan , Shawn P. Mulvaney , Brandon Blue , Samuel W. LaGasse , Cory D. Cress , Jesper T. Bjerg , Woo K. Lee
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Brian J. Eddie Jeremy T. Robinson
This is my paper · ORCID
classification physics.bio-phcond-mat.mtrl-scicond-mat.softq-bio.BM
keywords cablebacteriaDesulfobulbaceaeprotonicconductivityprotonwiresGrotthussmechanismbioelectronicstransfer-printingelectroactive
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This study reports direct measurements showing that cable bacteria—filamentous Desulfobulbaceae that already shuttle electrons over centimetres—also transport protons over distances greater than 100 micrometres when hydrated. Using palladium protodes stamped onto the bacteria, the authors measured protonic conductivities up to 114 ± 28 µS cm−1 at 25 °C and 70% relative humidity, with conductance rising steeply with humidity and an overall 15.8 ± 9.0-fold increase between 60% and 80% RH. The humidity dependence, the suppression of the signal when protons are replaced by deuterium, and the absence of the effect on a control filament (Microcoleus) point to proton wires carried by water associated with the bacterium, rather than ordinary electronic current or a generic water film. If correct, the finding adds a second long-range transport channel to cable bacteria and opens a route for building bioprotonic interfaces and probing proton-mediated microbial interactions.

What carries the argument

The load-bearing measurement tool is the palladium protode: a Pd pad that absorbs H2 to become PdHx, releasing protons and electrons, so a pair of protodes acts as a proton source and drain while the matching electrons are counted in an external circuit. The authors adapted transfer printing to place these protodes, and gold control electrodes, directly onto cable bacteria without heat or solvents. The Grotthuss mechanism—protons hopping along hydrogen-bonded water networks, forming 'proton wires'—is the physical model used to explain the strong dependence of protonic conductivity on relative humidity. Transfer-length measurements with variable gap lengths and a Nafion microwire reference provide contact resistance and benchmark the protonic signal.

What would settle it

Expose a similarly hydrated control filament—such as Microcoleus or a bare hydrophilic polymer fiber of the same geometry—to the same Pd-protode, H2, and humidity protocol; if it shows the same H2-dependent current, the cable-bacteria-specific protonic-conduction claim is falsified. Alternatively, chemically neutralizing the charged surface residues of cable bacteria and showing the conductance is unchanged would also rule out surface-mediated proton wires.

Watch

Extended reading notes

Core claim

The paper's central claim is that hydrated, non-viable cable bacteria are protonic conductors: they transport protons over distances >100 µm, with the highest measured protonic conductivity of 114 ± 28 µS cm−1 at 25 °C and 70% RH and a 15.8 ± 9.0-fold increase between 60% and 80% RH. The evidence combines palladium protodes that inject protons from H2 gas, gold electrodes that block protons but pass electrons, deuterium substitution that slows the carriers, and a Microcoleus control that shows no H2-dependent conductance. The authors interpret the humidity dependence and the similarity to Nafion's behavior as indicating proton transport by the Grotthuss mechanism along water-associated proton wires on the filament's exterior. They also report protonic contact resistance from transfer-length measurements, finding that contact resistance accounts for roughly 25–50% of the total resistance, so the reported conductivities are conservative.

Load-bearing premise

The claim depends on the assumption that the measured H2-dependent current flows as protons through the cable bacterium's own surface chemistry rather than along a contiguous adsorbed water film that could coat any hydrated filament; the Microcoleus control reduces but does not fully eliminate that alternative.

Editorial extensions

If this is right

  • Cable bacteria can serve as dual electronic and protonic conduits, with proton transport occurring along their hydrated exterior over distances relevant to microbial communities.
  • The strong humidity dependence of σP (15.8 ± 9.0-fold between 60% and 80% RH) supports a water-assisted Grotthuss mechanism and predicts that hydration state controls proton flux in natural sediments.
  • Because contact resistance accounts for 25–50% of total resistance and the full 2.5-µm filament cross-section was used in calculations, the reported protonic conductivities are lower bounds.
  • The transfer-printing protocol for depositing protodes can be applied to other delicate biological samples and curved materials, enabling broader surveys of protonic conductivity in microbes.
  • Protonic conductivity places cable bacteria on par with known biotic proton conductors such as reflectin and chitosan, suggesting the trait may be functionally selected rather than incidental.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If proton transport is confined to the 50-nm surface fibers rather than the full filament cross-section, the true protonic conductivity would be roughly two orders of magnitude larger than the reported values; the paper's geometric assumption makes the headline numbers conservative.
  • A decisive next test would be to measure live cable bacteria and sheath-isolated filaments, and to extract the activation energy from temperature-dependent σP; the paper leaves those to future work.
  • The same protode-stamping method could be used to screen other electroactive bacteria and curved abiotic proton conductors, potentially revealing whether long-range proton transport is widespread in sediments.
  • Should protonic transport participate in interspecies proton transfer, cable bacteria could coordinate microbial communities through a second, proton-based channel alongside direct electron transfer; the paper does not yet provide evidence for this.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. This manuscript reports measurements of proton transport along hydrated, non-viable cable bacteria (Desulfobulbaceae) using palladium protodes applied by a modified transfer-printing technique. The authors observe an H2-dependent conductance that is absent with Au blocking electrodes, strongly reduced when D2 replaces H2, absent for the filamentous cyanobacterium Microcoleus, and strongly dependent on relative humidity. They interpret this as protonic conductivity through water-associated Grotthuss-type 'proton wires' on the bacterial surface, report effective protonic conductivity values up to 114 ± 28 µS/cm, and compare the RH dependence with Nafion microwires. The paper also presents TLM-based contact resistance measurements and an environmental chamber protocol for bioprotonic devices.

Significance. If the result holds, this is a notable first demonstration of long-distance proton conduction in a bacterial filament and extends the bioprotonics toolkit to microbial and curved materials. The staging is strong: Pd protodes, Au IDE blocking controls, D2 isotope substitution, bare-device controls, a Nafion reference with similar RH dependence, and multiple filament types are all included. The authors are appropriately cautious in the Discussion about living-cell relevance and sedimentary proton fluxes. The main concerns are the unvalidated cross-sectional area used to compute σP and the limited ability of the Microcoleus control to rule out a generic adsorbed water film; both bear on the quantitative and mechanistic claims rather than on the qualitative existence of protonic conduction.

major comments (3)
  1. [Methods, Eqs. (5)–(6)] The reported protonic conductivity values in the abstract, Figure 3, and the Discussion are computed using Ac = πD_c²/4 with D_c = 2.5 µm. The Methods state that the conducting path may be the 50-nm surface fiber network and defer the justification to the SI. If proton transport is confined to a thin sheath or surface fiber layer, the true material conductivity would be substantially larger than the reported σP, and the comparisons to Nafion and reflectin would change because they use the full-diameter Ac. The qualitative finding of proton conduction is not affected, but the headline quantitative claim and the materials comparisons are load-bearing on this assumption. The main text should either validate the transport area or explicitly present all σP values as lower-bound effective values.
  2. [Results, Microcoleus control (Fig. 2e–f); Fig. 1f caption] The conclusion that cable bacteria contain specific 'proton wires' rather than that a suitable hydrophilic filament supports a contiguous adsorbed water film is not fully established. Microcoleus is a single cyanobacterium with different surface chemistry, so it does not control for a non-conductive filament with matched hydrophilicity. The D2 isotope effect confirms that the H2-dependent current is carried by protons/deuterons, but it does not identify the scaffold as cable-bacteria-specific. The Figure 1f caption itself states that the presence of carboxyl groups and in-situ proton transport have not been confirmed. The title and abstract should be softened, or an additional surface-matched filament control added, to avoid over-claiming the mechanistic specificity.
  3. [Methods, Eq. (4)] Equation (4), used for TLM conductivity, is typeset as σ_T = 4/(mπA_C²), which is dimensionally inconsistent. This is likely a typographical error, but because the TLM data in Figure 4 are used to derive σP and contact resistance, the correct expression (probably σ_T = 4/(mπD_C²)) must be provided and the TLM-derived values rechecked.
minor comments (5)
  1. [Abstract vs. Results] The abstract reports an increase of 'as much as 26-fold' between 60% and 80% RH, while the Results report an overall increase of 15.8 ± 9.0-fold; the relationship between these two numbers should be clarified.
  2. [Figure 3c caption] The caption reports a maximum σP of '3.5 ± 0.5 µσ cm-1'; the symbol should be µS/cm. The same typo appears in the Figure 4d caption.
  3. [Methods, D2 experiments] The abbreviation 'DH' is used for deuterium dioxide; please define it explicitly (e.g., D2O) at first use, and consistently report the relative humidity versus deuterium-oxide activity in the environmental chamber.
  4. [Discussion, contact resistance] The statement that Rc accounting for ~25–50% of RT 'indicates that the σP reported for cable bacteria are conservative estimates' is not self-explanatory; the authors should explain why a large contact-resistance fraction leads to conservative rather than biased estimates.
  5. [Methods, Eq. (8)] The pooled standard deviation formula is ambiguously typeset; please write it unambiguously, e.g., stdσP = sqrt((s_10%H2² + s_0%H2²)/2).

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the reported protonic conductivity is a measured differential conductance supported by independent controls and benchmarks; the only notable assumption (full cross-section area) affects the scale of the values, not the existence of protonic conduction.

full rationale

The central quantity sigma_P is defined operationally in Equation 7 as the difference between the mean total conductivity measured with 10% H2 and with 0% H2, based on linear-sweep-voltammetry conductance and the geometric factor in Equations 5-6. No parameter is fitted to the claim being tested; the H2-dependent conductance increase, the D2 kinetic isotope suppression, the absence of an H2 response on Au electrodes, and the null Microcoleus control are measured outputs rather than consequences of the assumed proton-conduction model. The Nafion microwire measurements serve as an independently measured reference material, not as a fitted prediction of cable-bacteria behavior. The relative-humidity dependence (a 15.8 +/- 9.0 fold increase for cable bacteria versus 23.7 +/- 3.0 fold for Nafion) is presented as supporting evidence for a Grotthuss-type mechanism, but that mechanism is not used as an input to compute sigma_P. The only load-bearing assumption is the choice of the full 2.5-micrometer diameter in Ac (Equation 6), a convention imported from the electronic-conductivity literature; this choice rescales the reported conductivity values but does not presuppose that protonic conduction exists, so it is a measurement-interpretation concern rather than a circular step. Citations to prior work on cable-bacteria electron transport provide background and are not used to derive the protonic-conduction conclusion. No equation in the derivation chain reduces, by construction or by self-citation, to its own input, so the analysis is self-contained and not circular.

Assumptions & free parameters 2 free parameters · 3 assumptions · 1 invented entities

The free parameters are geometric inputs, not fitted conductivities. The axioms encode the protode model, the baseline subtraction, and the Grotthuss analogy. The only invented entity is the hypothesized surface proton wire, which has indirect but not direct evidence.

free parameters (2)
  • Cable bacterium diameter Dc used for cross-sectional area Ac = 2.5 µm
    Reported sigma-P is computed as conductance times gap length divided by Ac = pi*Dc^2/4; choosing the whole 2.5 µm filament rather than the 50 nm fiber cross-section changes sigma-P values. This is a geometric input, not fitted to the proton data, but it is load-bearing for quantitative conductivity.
  • Nafion microwire diameter Dc = 6.3 µm
    Used to compute the reference Nafion conductivity from the same geometric formula; the reference values inherit the same cross-section sensitivity.
assumptions (3)
  • domain assumption Pd protodes inject protons according to the PdHx equilibrium, and the external electron current equals the proton current (Eq. 3).
    The entire interpretation of the H2-dependent current as protonic rests on the protode model; this is cited from prior bioprotonics work, not re-derived here.
  • domain assumption The 0% H2 conductance is unchanged when 10% H2 is added, apart from the protonic contribution, so sigma-P = mu10%H2 - mu0%H2 isolates proton transport (Eq. 7).
    The Au IDE control shows H2 does not inject electrons, but the subtraction also assumes no H2-induced change in electronic conductivity of the dead cells.
  • domain assumption Similar RH dependence of cable bacteria and Nafion identifies the Grotthuss mechanism (Figs. 3c and 4d).
    The analogy to Nafion is reasonable but not definitive; it supports a hopping mechanism without directly proving the structural basis of proton wires.
invented entities (1)
  • Surface-associated proton wires on cable bacteria
    purpose: Hypothesized conduction pathway that would explain long-distance proton transport via Grotthuss hopping along hydrated residues.
    The paper provides indirect evidence (RH dependence, D2 isotope effect, Nafion comparison) but no direct structural identification of proton wires on the bacterial surface; Fig. 1f notes that the presence of carboxyl groups and proton transport capability 'have not been confirmed'.

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Cite this review

Pith. "Pith review of Hydrated Cable Bacteria Exhibit Protonic Conductivity Over Long Distances." pith.science (2026). https://pith.science/paper/F6EST5WZ

@misc{pith2026250118651,
  author       = {Pith},
  title        = {Pith review of: Hydrated Cable Bacteria Exhibit Protonic Conductivity Over Long Distances},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/F6EST5WZ}},
  note         = {Machine review of arXiv:2501.18651}
}
read the original abstract

This study presents the direct measurement of proton transport along filamentous Desulfobulbaceae, or cable bacteria. Cable bacteria are filamentous multicellular microorganisms that have garnered much interest due to their ability to serve as electrical conduits, transferring electrons over several millimeters. Our results indicate that cable bacteria can also function as protonic conduits because they contain proton wires that transport protons at distances greater than 100 um. We find that protonic conductivity ({\sigma}P) along cable bacteria varies between samples and is measured as high as 114 +/- 28 uS cm^-1 at 25-degrees C and 70-percent relative humidity (RH). For cable bacteria, the protonic conductance (GP) and {\sigma}P are dependent upon the RH, increasing by as much as 26-fold between 60-percent and 80-percent RH. This observation implies that proton transport occurs via the Grotthuss mechanism along water associated with cable bacteria, forming proton wires. In order to determine {\sigma}P and GP along cable bacteria, we implemented a protocol using a modified transfer-printing technique to deposit either palladium interdigitated protodes (IDP), palladium transfer length method (TLM) protodes, or gold interdigitated electrodes(IDE) on top of cable bacteria. Due to the relatively mild nature of the transfer-printing technique, this method should be applicable to a broad array of biological samples and curved materials. The observation of protonic conductivity in cable bacteria presents possibilities for investigating the importance of long-distance proton transport in microbial ecosystems and to potentially build biotic or biomimetic scaffolds to interface with materials via proton-mediated gateways or channels.

Figures

Figures reproduced from arXiv: 2501.18651 by the authors.

Figure 2
Figure 2. a) I-V curve for linear sweep voltammetry (LSV) performed on cable bacteria spanning six ~10 µm gaps on a Pd interdigitated protode (IDP) at 80% relative humidity (RH) and in the presence of either 10% (red) or 0% (black) H2. A control is included showing the I-V curve for a Pd IDP without cable bacteria. b) I-V curve for cable bacteria spanning six ~10 µm gaps on a Au IDE at 80% RH and in the presence of either 10%… view at source ↗
Figure 1
Figure 1. [PITH_FULL_IMAGE:figures/full_fig_p028_1.png] view at source ↗
Figure 2
Figure 2. [PITH_FULL_IMAGE:figures/full_fig_p029_2.png] view at source ↗
Figures from the paper (2 more)
Figure 3
Figure 3. Figure 3 [PITH_FULL_IMAGE:figures/full_fig_p030_3.png]
Figure 4
Figure 4. Figure 4 [PITH_FULL_IMAGE:figures/full_fig_p031_4.png]

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Works this paper leans on

50 extracted references · 45 canonical work pages

  1. [1]

    Proton conductivity in ampullae of Lorenzini jelly

    Josberger, E., et al. Proton conductivity in ampullae of Lorenzini jelly. Science Advances 2(5), e1600112–e1600112 (2016). https://doi.org/10.1126/sciadv.1600112

    work page doi:10.1126/sciadv.1600112 2016

  2. [2]

    Proton transport through hydrated chitosan‐ based polymer membranes under electric fields

    Fischer, S.A., Dunlap, B.I., & Gunlycke, D. Proton transport through hydrated chitosan‐ based polymer membranes under electric fields. Journal of Polymer Science. Part B, Polymer Physic, 55(14), 1103–1109 (2017). https://doi.org/10.1002/polb.24361

    work page doi:10.1002/polb.24361 2017

  3. [3]

    Enhanced protonic conductivity and IFET behavior in individual proton- doped electrospun chitosan fibers

    Lee, W., et al. Enhanced protonic conductivity and IFET behavior in individual proton- doped electrospun chitosan fibers. Journal of Materials Chemistry C 7(35), 10833–10840 (2019). https://doi.org/10.1039/c9tc02452b

    work page doi:10.1039/c9tc02452b 2019

  4. [4]

    Electrical conduction in hydrated collagen

    Bardelmeyer, G.H. Electrical conduction in hydrated collagen. I. Conductivity mechanisms. Biopolymers 12, 2289-2302 (1973)

    work page 1973

  5. [5]

    Proton semiconductors and energy transduction in biological-systems

    Morowitz, H.J. Proton semiconductors and energy transduction in biological-systems. American Journal of Physiology 235(3), R99-R114 (1978). https://doi.org/10.1152/ajpregu.1978.235.3.R99

    work page doi:10.1152/ajpregu.1978.235.3.r99 1978

  6. [6]

    Proton conductivity of glycosaminoglycans

    Selberg, J., Jia, M., & Marco Rolandi. Proton conductivity of glycosaminoglycans. PloS ONE 14(3), e0202713 (2019). https://doi.org/10.1371/journal.pone.0202713

    work page doi:10.1371/journal.pone.0202713 2019

  7. [7]

    Review of Cephalopod‐Derived Biopolymers for Ionic and Protonic Transistors

    Kautz, R., et al. Review of Cephalopod‐Derived Biopolymers for Ionic and Protonic Transistors. Advanced Materials 30(19), e1704917 (2018). https://doi.org/10.1002/adma.201704917

    work page doi:10.1002/adma.201704917 2018

  8. [8]

    Bulk protonic conductivity in a cephalopod structural protein

    Ordinario, D.D., et al. Bulk protonic conductivity in a cephalopod structural protein. Nature Chemistry 6(7), 596–602 (2014). https://doi.org/10.1038/nchem.1960

    work page doi:10.1038/nchem.1960 2014

Show all 50 references
  1. [9]

    Protonic and Electronic Transport in Hydrated Thin Films of the Pigment Eumelanin

    Wünsche, J., et al. Protonic and Electronic Transport in Hydrated Thin Films of the Pigment Eumelanin. Chemistry of Materials 27(2), 436–442 (2015). https://doi.org/10.1021/cm502939r

    2015 doi

  2. [10]

    Long‐Range Proton Conduction across Free‐Standing Serum Albumin Mats

    Amdursky, N., et al. Long‐Range Proton Conduction across Free‐Standing Serum Albumin Mats. Advanced Materials 28(14), 2692–2698 (2016). https://doi.org/10.1002/adma.201505337

    2016 doi

  3. [11]

    Long-distance electron transport in individual, living cable bacteria

    Bjerg, J., et al. Long-distance electron transport in individual, living cable bacteria. Proceedings of the National Academy of Sciences of the United States of America 115(22), 5786–5791 (2018). https://doi.org/10.1073/pnas.1800367115

    2018 doi

  4. [12]

    Filamentous bacteria transport electrons over centimetre distances

    Pfeffer, C., et al. Filamentous bacteria transport electrons over centimetre distances. Nature 491(7423), 218–221 (2012). https://doi.org/10.1038/nature11586 Published January 13, 2025 in the Proceedings of the National Academy of Sciences of the United States of America: http...

    2012 doi

  5. [13]

    A highly conductive fibre network enables centimetre-scale electron transport in multicellular cable bacteria

    Meysman, F., et al. A highly conductive fibre network enables centimetre-scale electron transport in multicellular cable bacteria. Nature Communications 10(1), 4120–4120 (2019). https://doi.org/10.1038/s41467-019-12115-7

    2019 doi

  6. [14]

    Natural occurrence of microbial sulphur oxidation by long-range electron transport in the seafloor

    Malkin, S.Y., et al. Natural occurrence of microbial sulphur oxidation by long-range electron transport in the seafloor. The ISME Journal 8(9), 1843–18454 (2014). https://doi.org/10.1038/ismej.2014.41

    2014 doi

  7. [15]

    Cable Bacteria and the Bioelectrochemical Snorkel: The Natural and Engineered Facets Playing a Role in Hydrocarbons Degradation in Marine Sediments

    Matturro, B., et al. Cable Bacteria and the Bioelectrochemical Snorkel: The Natural and Engineered Facets Playing a Role in Hydrocarbons Degradation in Marine Sediments. Frontiers in Microbiology 8(MAY), 952–952 (2017). https://doi.org/10.3389/fmicb.2017.00952

    2017

  8. [16]

    Meysman, F., Risgaard-Petersen, N., Malkin, S., & Nielsen, L. (2015). The geochemical fingerprint of microbial long-distance electron transport in the seafloor. Geochimica et Cosmochimica Acta, 152I, 122–142. https://doi.org/10.1016/j.gca.2014.12.014

    2015 doi

  9. [17]

    Bjerg, J. J. Lustermans, J.J.M., Marshall, I.P.G. et al. Cable bacteria with electric connection to oxygen attract flocks of diverse bacteria. Nature Communications 14:1614 1-8 (2023). https://doi.org/10.1038/s41467-023-37272-8

    2023 doi

  10. [18]

    Electrical and electrochemical characterization of proton transfer at the interface between chitosan and PdHx

    Robinson, P., et al. Electrical and electrochemical characterization of proton transfer at the interface between chitosan and PdHx. Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices 5(42), 11083–11091 (2017). https://doi.org/10.1039/C7TC03215C

    2017 doi

  11. [19]

    & Rolandi, M

    Miyake, R. & Rolandi, M. Grotthuss mechanisms: from proton transport in proton wires to bioprotonic devices. Journal of Physics. Condensed Matter 28(2), 023001–023001 (2016). https://doi.org/10.1088/0953-8984/28/2/023001

    2016 doi

  12. [20]

    Grotthuss, C. J. T. Sur la de´composition de l’eau et des corps qu’elle tient en dissolution a` l’aide de l’e´lectricite´ galvanique. Annales de chimie et de physique 58, 54–73 (1806)

  13. [21]

    Et tu, Grotthuss! And other unfinished stories

    Cukierman, S. Et tu, Grotthuss! And other unfinished stories. BBA – Bioenergetics 1757(8), 876–885 (2006). https://doi.org/10.1016/j.bbabio.2005.12.001

    2006 doi

  14. [22]

    P., The Proton in Biochemistry: Impacts on Bioenergetics, Biophysical Chemistry, and Bioorganic Chemistry

    Silverstein, T. P., The Proton in Biochemistry: Impacts on Bioenergetics, Biophysical Chemistry, and Bioorganic Chemistry. Frontiers in Molecular Biophysics 8(764099) 1-18 (2021). https://doi.org/10.3389/fmolb.2021.764099

    2021

  15. [23]

    Self-Dissociation and Protonic Charge Transport in Water and Ice

    Eigen, M., & De Maeyer, L. Self-Dissociation and Protonic Charge Transport in Water and Ice. Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences (1934-1990) 247(1251), 505–533 (1958). https://doi.org/10.1098/rspa.1958.0208

    1958

  16. [24]

    H+-type and OH–type biological protonic semiconductors and complementary devices

    Deng, Y., et al. H+-type and OH–type biological protonic semiconductors and complementary devices. Scientific Reports 3(2), 2481 (2013). https://doi.org/10.1038/srep02481

    2013 doi

  17. [25]

    Synthesis of pyridine chitosan and its protonic conductivity

    Deng, Y., Helms, B., & Rolandi, M. Synthesis of pyridine chitosan and its protonic conductivity. Journal of Polymer Science Part A: Polymer Chemistry 53(2), 211–214 (2015). https://doi.org/10.1002/pola.27430 Published January 13, 2025 in the Proceedings of the National Academy...

    2015 doi

  18. [27]

    Analysis of Correlated Dynamics in the Grotthuss Mechanism of Proton Diffusion

    Fischer, S.A., & Gunlycke, D. Analysis of Correlated Dynamics in the Grotthuss Mechanism of Proton Diffusion. The Journal of Physical Chemistry. B 123(26), 5536– 5544 (2019). https://doi.org/10.1021/acs.jpcb.9b02610

    2019 doi

  19. [28]

    Hydration and proton conductivity of ionomers: the model case of Sulfonated Aromatic Polymers

    Eknauth, P., & Vona, M.L.E. Hydration and proton conductivity of ionomers: the model case of Sulfonated Aromatic Polymers. Frontiers in Energy Research 2(50), 1-6 (2014). https://doi.org/10.3389/fenrg.2014.00050

    2014

  20. [29]

    & Simonsson, D

    Sone, Y. & Simonsson, D. Proton Conductivity of Nafion 117 as Measured by a Four- Electrode AC Impedance Method. Journal of the Electrochemical Society 143(4), 1254– 1259 (1996). https://doi.org/10.1149/1.1836625

    1996 doi

  21. [30]

    Link between capacity for current production and syntrophic growth in Geobacter species

    Rotaru AE, Woodard TL, Nevin KP, Lovley DR. Link between capacity for current production and syntrophic growth in Geobacter species. Front Microbiol. 2015 Jul 21;6:744. doi: 10.3389/fmicb.2015.00744

    2015

  22. [31]

    & Kirk, M.F

    Jin, Q. & Kirk, M.F. pH as a Primary Control in Environmental Microbiology: 1. Thermodynamic Perspective. Frontiers in Environmental Science 6, 1-21 (2018). https://doi.org/10.3389/fenvs.2018.00021

    2018

  23. [32]

    B., Mostert, A

    Rienecker, S. B., Mostert, A. B., Schenk, G., Hanson, G. R., Meredith, P. Heavy water as a probe of the free radical nature and electrical conductivity of melanin. J. Phys. Chem. B 119, 14994–15000 (2015)

    2015

  24. [33]

    & Northey, H

    Roberts, N. & Northey, H. Proton and deuteron mobility in normal and heavy water solutions of electrolytes. Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases 70, 253-262 (1974). https://doi.org/10.1039/f19747000253

    1974 doi

  25. [34]

    & Slewa, L

    Abbas, T. & Slewa, L. Transmission line method (TLM) measurement of (metal/ZnS) contact resistance. International Journal of Nanoelectronics & Materials 8, 111-120 (2015)

    2015

  26. [35]

    and Estévez-Pérez, M.G

    Andrade, J.M. and Estévez-Pérez, M.G. Statistical comparison of the slopes of two regression lines: A tutorial. Analytica Chimica Acta 838, 1–12 (2014). https://doi.org/10.1016/j.aca.2014.04.057

    2014 doi

  27. [36]

    Influence of acid pretreatment on ionic conductivity of Nafion® membranes

    Kuwertz, R., Kirstein, C., Turek, T., & Kunz, U. Influence of acid pretreatment on ionic conductivity of Nafion® membranes. Journal of Membrane Science, 500, 225–235. (2016). https://doi.org/10.1016/j.memsci.2015.11.022

    2016 doi

  28. [37]

    F., Kapetanovic, A., Anantram, M

    Zhong, C., Deng, Y., Roudsari, A. F., Kapetanovic, A., Anantram, M. P., & Rolandi, M. A polysaccharide bioprotonic field-effect transistor. Nature Communications, 2(1), 476–

  29. [38]

    B., Dittmer, A

    Risgaard-Petersen, N., Kristiansen, M., Frederiksen, R. B., Dittmer, A. L., Bjerg, J. T., Trojan, D., Schreiber, L., Damgaard, L. R., Schramm, A., & Nielsen, L. P. Cable Bacteria in Freshwater Sediments. Applied and Environmental Microbiology, 81(17), 6003–6011. (2015). https:...

    2015 doi

  30. [39]

    Novel mode of microbial energy metabolism: organic carbon oxidation coupled to dissimilatory reduction of iron or manganese

    Lovley DR, Phillips EJ. Novel mode of microbial energy metabolism: organic carbon oxidation coupled to dissimilatory reduction of iron or manganese. Appl Environ Microbiol. 1988 Jun;54(6):1472-80. doi: 10.1128/aem.54.6.1472-1480.1988

    1988

  31. [40]

    D., Mehta, T., Nicoll, J

    Reguera, G., McCarthy, K. D., Mehta, T., Nicoll, J. S., Tuominen, M. T., & Lovley, D. R. (2005). Extracellular electron transfer via microbial nanowires. In Nature (Vol. 435, Issue 7045, pp. 1098–1101). Springer Science and Business Media LLC. https://doi.org/10.1038/nature03661

    2005 doi

  32. [41]

    Malvankar, N., Vargas, M., Nevin, K. et al. Tunable metallic-like conductivity in microbial nanowire networks. Nature Nanotech 6, 573–579 (2011). https://doi.org/10.1038/nnano.2011.119

    2011 doi

  33. [42]

    M., Snider R

    Strycharz-Glaven S. M., Snider R. M., Guiseppi-Elie A., Tender L. M. On the electrical conductivity of microbial nanowires and biofilms. Energy & Environmental Science. 2011;4(11):4366–4379. doi: 10.1039/c1ee01753e

    2011 doi

  34. [43]

    Aromatic amino acids required for pili conductivity and long- range extracellular electron transport in Geobacter sulfurreducens

    Vargas M, Malvankar NS, Tremblay PL, Leang C, Smith JA, Patel P, Snoeyenbos-West O, Nevin KP, Lovley DR. Aromatic amino acids required for pili conductivity and long- range extracellular electron transport in Geobacter sulfurreducens. mBio. 2013 Mar 12;4(2):e00105-13. doi: 10....

    2013 doi

  35. [44]

    S., Shu C., Martz E., Lovley D

    Xiao K., Malvankar N. S., Shu C., Martz E., Lovley D. R., Sun X. Low energy atomic models suggesting a pilus structure that could account for electrical conductivity of geobacter sulfurreducens pili. Scientific Reports. 2016;6(1):p. 23385. doi: 10.1038/srep23385

    2016 doi

  36. [45]

    Direct Extracellular Electron Transfer of the Geobacter sulfurreducens Pili Relevant to Interaromatic Distances

    Shu C, Zhu Q, Xiao K, Hou Y, Ma H, Ma J, Sun X. Direct Extracellular Electron Transfer of the Geobacter sulfurreducens Pili Relevant to Interaromatic Distances. Biomed Res Int. 2019 Nov 11;2019:6151587. doi: 10.1155/2019/6151587

    2019 doi

  37. [46]

    Structure of microbial nanowires reveals stacked hemes that transport electrons over micrometers

    Wang, F., et al. Structure of microbial nanowires reveals stacked hemes that transport electrons over micrometers. Cell 177, 361–369 (2019). Doi: 10.1016/j.cell.2019.03.029

    2019 doi

  38. [47]

    Chance and design—Proton transfer in water, channels and bioenergetic proteins

    Wraight, C. Chance and design—Proton transfer in water, channels and bioenergetic proteins. B–A - Bioenergetics 1757(8), 886–912 (2006). https://doi.org/10.1016/j.bbabio.2006.06.017

    2006 doi

  39. [48]

    Sequence dependent proton conduction in self-assembled peptide nanostructures

    Yardeni, J.L., Amit, M., Ashkenasy, G., & Ashkenasy, N. Sequence dependent proton conduction in self-assembled peptide nanostructures. Nanoscale 8(4), 2358–2366 (2016). https://doi.org/10.1039/c5nr06750b

    2016 doi

  40. [49]

    Proton Conduction in a Tyrosine‐Rich Peptide/Manganese Oxide Hybrid Nanofilm

    Lee, J., et al. Proton Conduction in a Tyrosine‐Rich Peptide/Manganese Oxide Hybrid Nanofilm. Advanced Functional Materials 27(35), 1702185 (2017). https://doi.org/10.1002/adfm.201702185

    2017 doi

  41. [50]

    Two-Terminal Protonic Devices with Synaptic-Like Short-Term Depression and Device Memory

    Josberger, D.E., Deng, Y., Sun, W., Kautz, R., Rolandi, M. Two-Terminal Protonic Devices with Synaptic-Like Short-Term Depression and Device Memory. Advanced Materials 26(29), 4986–4990 (2014). https://doi.org/10.1002/adma.201400320 Published January 13, 2025 in the Proceeding...

    2014 doi

  42. [476]

    https://doi.org/10.1038/ncomms1489

    (2011). https://doi.org/10.1038/ncomms1489

    2011 doi

Pith tools

Reviewed August 10, 2026 · model on record in the stance chip above.