Extracellular electron transfer mechanisms between microorganisms and minerals

Nature Reviews Microbiology, Год журнала: 2016, Номер 14(10), С. 651 - 662

Опубликована: Авг. 30, 2016

Язык: Английский

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Extracellular polymeric substances are transient media for microbial extracellular electron transfer

Science Advances, Год журнала: 2017, Номер 3(7)

Опубликована: Июль 6, 2017

Extracellular polymeric substances play important roles in microbial extracellular electron transfer processes.

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Syntrophy Goes Electric: Direct Interspecies Electron Transfer

Annual Review of Microbiology, Год журнала: 2017, Номер 71(1), С. 643 - 664

Опубликована: Июль 12, 2017

Direct interspecies electron transfer (DIET) has biogeochemical significance, and practical applications that rely on DIET or DIET-based aspects of microbial physiology are growing. Mechanisms for have primarily been studied in defined cocultures which Geobacter species one the partners. Electrically conductive pili (e-pili) can be an important electrical conduit DIET. However, there may instances contacts made between transport proteins associated with outer membranes Alternatively, partners plug into carbon materials, such as granular activated carbon, cloth, biochar, long-range exchange without need e-pili. Magnetite promotes DIET, possibly by acting a substitute outer-surface c-type cytochromes. is primary mode some anaerobic digesters converting wastes to methane. Promoting materials shows promise stabilizing accelerating methane production digesters, permitting higher organic loading rates. Various lines evidence suggest terrestrial wetlands, source atmospheric also role oxidation coupled sulfate reduction, control releases. The finding serve electrons photosynthesis further broadens its potential environmental significance. Microorganisms capable good catalysts several bioelectrochemical technologies e-pili promising renewable electronic materials. study early stages, additional investigation required better understand diversity microorganisms importance flow environments, biochemistry

Язык: Английский

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The Biogeochemical Sulfur Cycle of Marine Sediments

Frontiers in Microbiology, Год журнала: 2019, Номер 10

Опубликована: Апрель 24, 2019

Microbial dissimilatory sulfate reduction to sulfide is a predominant terminal pathway of organic matter mineralization in the anoxic seabed. Chemical or microbial oxidation produced establishes complex network pathways sulfur cycle, leading intermediate species and partly back sulfate. The intermediates include elemental sulfur, polysulfides, thiosulfate, sulfite, which are all substrates for further oxidation, disproportionation. New microbiological discoveries, such as long-distance electron transfer through oxidizing cable bacteria, add complexity. Isotope exchange reactions play an important role stable isotope geochemistry experimental study transformations using radiotracers. Microbially catalyzed processes reversible whereby back-reaction affects our interpretation radiotracer experiments provides mechanism fractionation. We here review progress current status understanding cycle seabed with respect its ecology, biogeochemistry, geochemistry.

Язык: Английский

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Archaea catalyze iron-dependent anaerobic oxidation of methane

Proceedings of the National Academy of Sciences, Год журнала: 2016, Номер 113(45), С. 12792 - 12796

Опубликована: Окт. 24, 2016

Anaerobic oxidation of methane (AOM) is crucial for controlling the emission this potent greenhouse gas to atmosphere. Nitrite-, nitrate-, and sulfate-dependent well-documented, but AOM coupled reduction oxidized metals has so far been demonstrated only in environmental samples. Here, using a freshwater enrichment culture, we show that archaea order Methanosarcinales, related "Candidatus Methanoperedens nitroreducens," couple environmentally relevant forms Fe3+ Mn4+ methane. We obtained an culture these under anaerobic, nitrate-reducing conditions with continuous supply Via batch incubations [13C]methane, soluble ferric iron (Fe3+, as Fe-citrate) nanoparticulate supported methane-oxidizing activity. CO2 ferrous (Fe2+) were produced stoichiometric amounts. Our study connects previous finding iron-dependent microorganisms detected numerous habitats worldwide. Consequently, it enables better understanding interaction between biogeochemical cycles

Язык: Английский

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Methane Feedbacks to the Global Climate System in a Warmer World

Reviews of Geophysics, Год журнала: 2018, Номер 56(1), С. 207 - 250

Опубликована: Фев. 16, 2018

Abstract Methane (CH 4 ) is produced in many natural systems that are vulnerable to change under a warming climate, yet current CH budgets, as well future shifts emissions, have high uncertainties. Climate has the potential increase emissions from critical such wetlands, marine and freshwater systems, permafrost, methane hydrates, through temperature, hydrology, vegetation, landscape disturbance, sea level rise. Increased these would turn induce further climate change, resulting positive feedback. Here we synthesize biological, geochemical, physically focused feedback literature, bringing together key findings of disciplines. We discuss environment‐specific processes, including microbial, physical, geochemical interlinkages timescales on which they operate, present state knowledge feedbacks immediate distant future. The important linkages between microbial activity discussed with aim better constrain sensitivity cycle predictions. determine wetlands will form majority up 2100. Beyond this timescale, permafrost environments could become more important. Significant atmosphere dissociation hydrates not expected near Our highlight importance quantifying whether consumption can counterbalance production scenarios.

Язык: Английский

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Intercellular wiring enables electron transfer between methanotrophic archaea and bacteria

Nature, Год журнала: 2015, Номер 526(7574), С. 587 - 590

Опубликована: Окт. 20, 2015

Язык: Английский

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An evolving view of methane metabolism in the Archaea

Nature Reviews Microbiology, Год журнала: 2019, Номер 17(4), С. 219 - 232

Опубликована: Янв. 21, 2019

Язык: Английский

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Common principles and best practices for engineering microbiomes

Nature Reviews Microbiology, Год журнала: 2019, Номер 17(12), С. 725 - 741

Опубликована: Сен. 23, 2019

Язык: Английский

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Artificial electron acceptors decouple archaeal methane oxidation from sulfate reduction

Science, Год журнала: 2016, Номер 351(6274), С. 703 - 707

Опубликована: Фев. 12, 2016

The oxidation of methane with sulfate is an important microbial metabolism in the global carbon cycle. In marine seeps, this process mediated by consortia anaerobic methanotrophic archaea (ANME) that live syntrophy sulfate-reducing bacteria (SRB). underlying interdependencies within uncultured symbiotic partnership are poorly understood. We used a combination rate measurements and single-cell stable isotope probing to demonstrate ANME deep-sea sediments can be catabolically anabolically decoupled from their syntrophic SRB partners using soluble artificial oxidants. still sustain high rates absence as terminal oxidant, lending support hypothesis interspecies extracellular electron transfer mechanism for methane.

Язык: Английский

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