Electroactive microorganisms in bioelectrochemical systems

Nature Reviews Microbiology, Год журнала: 2019, Номер 17(5), С. 307 - 319

Опубликована: Март 7, 2019

Язык: Английский

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Towards sustainable wastewater treatment by using microbial fuel cells-centered technologies

Energy & Environmental Science, Год журнала: 2013, Номер 7(3), С. 911 - 924

Опубликована: Ноя. 28, 2013

Microbial fuel cells (MFCs) have been conceived and intensively studied as a promising technology to achieve sustainable wastewater treatment. However, doubts debates arose in recent years regarding the technical economic viability of this on larger scale real-world applications. Hence, it is time think about examine how recalibrate technology's role future paradigm In past years, many good ideas/approaches proposed investigated for MFC application, but information scattered. Various review papers were published configuration, substrates, electrode materials, separators microbiology there lack critical thinking systematic analysis application niche To systematically formulate strategy (potentially) practical provide guide development, perspective has critically examined discussed problems challenges developing technology, identified possible whereby MFCs can be rationally incorporated into treatment process. We propose integration with other technologies form an MFC-centered scheme based thoroughly analyzing opportunities, discuss efforts made realizing

Язык: Английский

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Direct Interspecies Electron Transfer between Geobacter metallireducens and Methanosarcina barkeri

Applied and Environmental Microbiology, Год журнала: 2014, Номер 80(15), С. 4599 - 4605

Опубликована: Май 17, 2014

ABSTRACT Direct interspecies electron transfer (DIET) is potentially an effective form of syntrophy in methanogenic communities, but little known about the diversity methanogens capable DIET. The ability Methanosarcina barkeri to participate DIET was evaluated coculture with Geobacter metallireducens . Cocultures formed aggregates that shared electrons via during stoichiometric conversion ethanol methane. could not be initiated a pilin-deficient G. strain, suggesting long-range along pili important for Amendments granular activated carbon permitted isolates share M. , demonstrating this conductive material substitute promoting When grown H 2 -producing Pelobacter carbinolicus incapable DIET, utilized as donor metabolized acetate P. produced. This suggested derived from inhibited metabolism. carbinolicus-M. cocultures did aggregate, that, unlike close physical contact necessary transfer. second methanogen found accept and first using either or CO reduction. Furthermore, genetically tractable, making it model organism elucidating mechanisms by which make biological electrical connections other cells.

Язык: Английский

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Promoting direct interspecies electron transfer with activated carbon

Energy & Environmental Science, Год журнала: 2012, Номер 5(10), С. 8982 - 8982

Опубликована: Янв. 1, 2012

Granular activated carbon (GAC) is added to methanogenic digesters enhance conversion of wastes methane, but the mechanism(s) for GAC's stimulatory effect are poorly understood. GAC has high electrical conductivity and thus it was hypothesized that one mechanism stimulation methanogenesis might be facilitate direct interspecies electron transfer (DIET) between bacteria methanogens. Metabolism substantially accelerated when co-cultures Geobacter metallireducens sulfurreducens grown under conditions previously shown require DIET. Cells were attached GAC, did not aggregate as they do making biological connections cells. Studies with a series gene deletion mutants eliminated possibility promoted exchange via hydrogen or formate demonstrated DIET in presence electrically conductive pili associated c-type cytochrome involved connections. also greatly stimulated ethanol metabolism methane production G. Methanosarcina barkeri. closely aggregated, suggesting little opportunity contacts species. enhanced samples from digester which Methanosaeta predominant The results demonstrate can promote suggest attributed, at least part, providing better than those forged biologically.

Язык: Английский

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Promoting Interspecies Electron Transfer with Biochar

Scientific Reports, Год журнала: 2014, Номер 4(1)

Опубликована: Май 21, 2014

Biochar, a charcoal-like product of the incomplete combustion organic materials, is an increasingly popular soil amendment designed to improve fertility. We investigated possibility that biochar could promote direct interspecies electron transfer (DIET) in manner similar previously reported for granular activated carbon (GAC). Although biochars were 1000 times less conductive than GAC, they stimulated DIET co-cultures Geobacter metallireducens with sulfurreducens or Methanosarcina barkeri which ethanol was donor. Cells attached biochar, yet not close contact, suggesting electrons likely conducted through rather biological electrical connections. The finding can stimulate may be important consideration when amending soils and help explain why enhance methane production from wastes under anaerobic conditions.

Язык: Английский

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Single cell activity reveals direct electron transfer in methanotrophic consortia

Nature, Год журнала: 2015, Номер 526(7574), С. 531 - 535

Опубликована: Сен. 16, 2015

Язык: Английский

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Microbial fuel cells: An overview of current technology

Renewable and Sustainable Energy Reviews, Год журнала: 2018, Номер 101, С. 60 - 81

Опубликована: Ноя. 14, 2018

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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Microbial electron transport and energy conservation – the foundation for optimizing bioelectrochemical systems

Frontiers in Microbiology, Год журнала: 2015, Номер 6

Опубликована: Июнь 11, 2015

Microbial electrochemical techniques describe a variety of emerging technologies that use electrode-bacteria-interactions for biotechnology applications including the production electricity, waste and wastewater treatment, bioremediation valuable products. Central in each application is ability microbial catalyst to interact with external electron acceptors and/or donors its metabolic properties enable combination transport carbon metabolism. And here also lies key challenge. A wide range microbes has been discovered be able exchange electrons solid surfaces or mediators but only few have studied depth. Especially transfer mechanisms from cathodes towards organism are poorly understood essential many such as electrosynthesis. We analyse different chains nature offers organisms metal respiring bacteria acetogens, standard biotechnological currently used bio-production. Special focus on connection redox energy metabolism, which often ignored when studying bio-electrochemical systems. The possibility extracellular at points discussed regarding required potentials effect cellular levels. Key compounds carriers (e.g. cytochromes, ferredoxin, quinones, flavins) identified analysed their possible role electrode-microbe-interactions. This work summarizes our current knowledge processes uses theoretical approach predict impact modes As it adds an important piece fundamental understanding possibilities research community will help optimize advance techniques.

Язык: Английский

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