keyword
MENU ▼
Read by QxMD icon Read
search

Geobacter

keyword
https://www.readbyqxmd.com/read/28821212/characterization-of-syntrophic-geobacter-communities-using-tof-sims
#1
Wenchao Wei, Yanyan Zhang, Rachel Komorek, Andrew Plymale, Rujia Yu, Bingchen Wang, Zihua Zhu, Fanghua Liu, Xiao-Ying Yu
The aggregation of syntrophic Geobacter metallireducens and Geobacter sulfurreducens is beneficial for enhancing direct interspecies electron transfer (DIET). Although DIET was suspected to occur on the microbial community surface, the surface chemical speciation of such cocultured communities remains unclear. In order to better understand surface interactions related to DIET, the authors characterized a series of samples associated with syntrophic G. metallireducens and G. sulfurreducens using surface sensitive time-of-flight secondary ion mass spectrometry (ToF-SIMS)...
August 18, 2017: Biointerphases
https://www.readbyqxmd.com/read/28818813/nitrogen-loss-from-anaerobic-ammonium-oxidation-coupled-to-iron-iii-reduction-in-a-riparian-zone
#2
Bangjing Ding, Zhengkui Li, Yunbin Qin
Anaerobic ammonium oxidation coupled to iron(III) reduction (termed Feammox) is a recently discovered pathway of nitrogen cycling. However, little is known about the pathways of N transformation via Feammox process in riparian zones. In this study, evidence for Feammox in riparian zones with or without vegetation cover was demonstrated using isotope tracing technique and high-throughput sequencing technology. The results showed that Feammox could occur in riparian zones, and demonstrated that N2 directly from Feammox was dominant Feammox pathway...
August 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28806071/contrasting-effects-of-dissolved-organic-matter-on-mercury-methylation-by-g-sulfurreducens-pca-and-d-desulfuricans-nd132
#3
Linduo Zhao, Hongmei Chen, Xia Lu, Hui Lin, Geoff A Christensen, Eric M Pierce, Baohua Gu
Natural dissolved organic matter (DOM) affects mercury (Hg) redox reactions and anaerobic microbial Hg methylation in the environment. Several studies have shown that DOM can enhance Hg methylation, especially under sulfidic conditions, whereas others show that DOM inhibits Hg methylation due to strong Hg-DOM complexation. In this study, we investigated and compared the effects of DOM on Hg methylation by an iron-reducing bacterium Geobacter sulfurreducens PCA and a sulfate-reducing bacterium Desulfovibrio desulfuricans ND132 under non-sulfidic conditions...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28805699/predicting-and-interpreting-the-structure-of-type-iv-pilus-of-electricigens-by-molecular-dynamics-simulations
#4
Chuanjun Shu, Ke Xiao, Changchang Cao, Dewu Ding, Xiao Sun
Nanowires that transfer electrons to extracellular acceptors are important in organic matter degradation and nutrient cycling in the environment. Geobacter pili of the group of Type IV pilus are regarded as nanowire-like biological structures. However, determination of the structure of pili remains challenging due to the insolubility of monomers, presence of surface appendages, heterogeneity of the assembly, and low-resolution of electron microscopy techniques. Our previous study provided a method to predict structures for Type IV pili...
August 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28783184/geobacter-sulfurreducens-pili-support-ohmic-electronic-conduction-in-aqueous-solution
#5
Nicole L Ing, Tyler D Nusca, Allon I Hochbaum
The bacterium Geobacter sulfurreducens is a model biological catalyst in microbial electrochemical devices. G. sulfurreducens forms electrically conductive, electrode-associated biofilms, but the biological structures mediating electrical conduction from cells to the electrodes are a matter of debate. Bacteria in these communities produce a network of fiber-like Type IV pili, which have been proposed to act either as inherent, protein-based electronic conductors, or as electronically inert scaffolds for cytochromes mediating long-range charge transport...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28777963/biochar-accelerates-microbial-reductive-debromination-of-2-2-4-4-tetrabromodiphenyl-ether-bde-47-in-anaerobic-mangrove-sediments
#6
Juan Chen, Chao Wang, Ying Pan, Shazia Shyla Farzana, Nora Fung-Yee Tam
A common congener of polybrominated diphenyl ethers, 2,2',4,4'-tetrabromodiphenyl ether (BDE-47), is a prevalent, persistent and toxic pollutant. It could be removed by reduction debromination by microorganisms but the rate is often slow. The study hypothesized that spent mushroom substrate derived biochar amendment could accelerate the microbial reductive debromination of BDE-47 in anaerobic mangrove sediment slurries and evaluated the mechanisms behind. At the end of 20-week experiment, percentages of residual BDE-47 in slurries amended with biochar were significantly lower but debromination products were higher than those without biochar...
July 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28773862/electricity-recovery-from-municipal-sewage-wastewater-using-a-hydrogel-complex-composed-of-microbially-reduced-graphene-oxide-and-sludge
#7
Naoko Yoshida, Yasushi Miyata, Ai Mugita, Kazuki Iida
Graphene oxide (GO) has recently been shown to be an excellent anode substrate for exoelectrogens. This study demonstrates the applicability of GO in recovering electricity from sewage wastewater. Anaerobic incubation of sludge with GO formed a hydrogel complex that embeds microbial cells via π-π stacking of microbially reduced GO. The rGO complex was electrically conductive (23 mS·cm(-1)) and immediately produced electricity in sewage wastewater under polarization at +200 mV vs. Ag/AgCl. Higher and more stable production of electricity was observed with rGO complexes (179-310 μA·cm(-3)) than with graphite felt (GF; 79-95 μA·cm(-3))...
August 31, 2016: Materials
https://www.readbyqxmd.com/read/28768219/removal-of-antimonate-from-wastewater-by-dissimilatory-bacterial-reduction-role-of-the-coexisting-sulfate
#8
Yanping Zhu, Min Wu, Naiyun Gao, Wenhai Chu, Na An, Qiongfang Wang, Shuaifeng Wang
The priority pollutant antimony (Sb) exists primarily as Sb(V) and Sb(III) in natural waters, and Sb(III) is generally with greater mobility and toxicity than Sb(V). The bio-reduction of Sb(V) would not become a meaningful Sb-removal process unless the accumulation of produced dissolved Sb(III) could be controlled. Here, we examined the dissimilatory antimonate bio-reduction with or without the coexistence of sulfate using Sb-acclimated biomass. Results demonstrated that 0.8mM Sb(V) was almost completely bio-reduced within 20h along with 48...
July 21, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28766873/analysis-of-nifh-rna-reveals-phylotypes-related-to-geobacter-and-cyanobacteria-as-important-functional-components-of-the%C3%A2-n2-fixing-community-depending-on-depth-and-agricultural%C3%A2-use-of-soil
#9
Priscila A Calderoli, Mónica M Collavino, Filipe Behrends Kraemer, Héctor J M Morrás, O Mario Aguilar
In this survey, a total of 80 787 reads and 28 171 unique NifH protein sequences were retrieved from soil RNA. This dataset extends our knowledge about the structure and diversity of the functional diazotrophic communities in agricultural soils from Argentinean Pampas. Operational taxonomic unit (OTU)-based analyses showed that nifH phylotypes related to Geobacter and Anaeromyxobacter (44.8%), Rhizobiales (29%), Cyanobacteria (16.7%), and Verrucomicrobiales (8%) are key microbial components of N2 fixation in soils associated with no-till management and soil depth...
August 1, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28765215/methane-fueled-syntrophy-through-extracellular-electron-transfer-uncovering-the-genomic-traits-conserved-within-diverse-bacterial-partners-of-anaerobic-methanotrophic-archaea
#10
Connor T Skennerton, Karuna Chourey, Ramsunder Iyer, Robert L Hettich, Gene W Tyson, Victoria J Orphan
The anaerobic oxidation of methane by anaerobic methanotrophic (ANME) archaea in syntrophic partnership with deltaproteobacterial sulfate-reducing bacteria (SRB) is the primary mechanism for methane removal in ocean sediments. The mechanism of their syntrophy has been the subject of much research as traditional intermediate compounds, such as hydrogen and formate, failed to decouple the partners. Recent findings have indicated the potential for extracellular electron transfer from ANME archaea to SRB, though it is unclear how extracellular electrons are integrated into the metabolism of the SRB partner...
August 1, 2017: MBio
https://www.readbyqxmd.com/read/28713354/microbial-populations-of-stony-meteorites-substrate-controls-on-first-colonizers
#11
Alastair W Tait, Emma J Gagen, Siobhan A Wilson, Andrew G Tomkins, Gordon Southam
Finding fresh, sterilized rocks provides ecologists with a clean slate to test ideas about first colonization and the evolution of soils de novo. Lava has been used previously in first colonizer studies due to the sterilizing heat required for its formation. However, fresh lava typically falls upon older volcanic successions of similar chemistry and modal mineral abundance. Given enough time, this results in the development of similar microbial communities in the newly erupted lava due to a lack of contrast between the new and old substrates...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28705423/carbon-nanotube-fiber-mats-for-microbial-fuel-cell-electrodes
#12
Brigitte Delord, Wilfrid Neri, Karen Bertaux, Alain Derre, Isabelle Ly, Nicolas Mano, Philippe Poulin
Novel carbon nanotube based electrodes of microbial fuel cells (MFC) have been developed. MFC is a promising technology for the wastewater treatment and the production of electrical energy from redox reactions of natural substrates. Performances of such bio-electrochemical systems depend critically on the structure and properties of the electrodes. The presently developed materials are made by weaving fibers solely comprised of carbon nanotubes. They exhibit a large scale porosity controlled by the weaving process...
July 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28698657/anaerobic-oxidation-of-methane-coupled-with-extracellular-electron-transfer-to-electrodes
#13
Yaohuan Gao, Jangho Lee, Josh D Neufeld, Joonhong Park, Bruce E Rittmann, Hyung-Sool Lee
Anaerobic oxidation of methane (AOM) is an important process for understanding the global flux of methane and its relation to the global carbon cycle. Although AOM is known to be coupled to reductions of sulfate, nitrite, and nitrate, evidence that AOM is coupled with extracellular electron transfer (EET) to conductive solids is relatively insufficient. Here, we demonstrate EET-dependent AOM in a biofilm anode dominated by Geobacter spp. and Methanobacterium spp. using carbon-fiber electrodes as the terminal electron sink...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28697668/syntrophy-goes-electric-direct-interspecies-electron-transfer
#14
Derek R Lovley
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 DIET have primarily been studied in defined cocultures in which Geobacter species are one of the DIET partners. Electrically conductive pili (e-pili) can be an important electrical conduit for DIET. However, there may be instances in which electrical contacts are made between electron transport proteins associated with the outer membranes of the partners...
July 11, 2017: Annual Review of Microbiology
https://www.readbyqxmd.com/read/28696043/the-bioelectric-well-a-novel-approach-for-in%C3%A2-situ-treatment-of-hydrocarbon-contaminated-groundwater
#15
Enza Palma, Matteo Daghio, Andrea Franzetti, Marco Petrangeli Papini, Federico Aulenta
Groundwater contamination by petroleum hydrocarbons (PHs) is a widespread problem which poses serious environmental and health concerns. Recently, microbial electrochemical technologies (MET) have attracted considerable attention for remediation applications, having the potential to overcome some of the limiting factors of conventional in situ bioremediation systems. So far, field-scale application of MET has been largely hindered by the limited availability of scalable system configurations. Here, we describe the 'bioelectric well' a bioelectrochemical reactor configuration, which can be installed directly within groundwater wells and can be applied for in situ treatment of organic contaminants, such as PHs...
July 11, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28695687/electro-fermentation-triggering-population-selection-in-mixed-culture-glycerol-fermentation
#16
Roman Moscoviz, Eric Trably, Nicolas Bernet
Electro-fermentation is a new technique that could be used to influence the global metabolism in mixed-culture fermentation. In this study, a mixed-culture cathodic electro-fermentation of glycerol was investigated. Both microbial community structure and metabolic patterns were altered when compared to standard fermentation. This microbial population shift was more significant when the working electrodes were pre-colonized by Geobacter sulfurreducens, before electro-fermentation. The electro-fermenting microbial community was more efficient for producing 1,3-propanediol with an improved yield of 10% when compared with fermentation controls...
July 11, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28686895/bioenergy-generation-and-rhizodegradation-as-affected-by-microbial-community-distribution-in-a-coupled-constructed-wetland-microbial-fuel-cell-system-associated-with-three-macrophytes
#17
Junfeng Wang, Xinshan Song, Yuhui Wang, Junhong Bai, Manjie Li, Guoqiang Dong, Fanda Lin, Yanfeng Lv, Denghua Yan
Rhizodeposits excreted by various macrophytes might lead to the potential discrepancy of microbial community distribution in constructed wetland coupled with microbial fuel cell (CW-MFC), which has been considered as main factors for the variations of bioelectricity generation during wastewater treatment. In this study, CW-MFC has been associated with three macrophytes (J. effuses, T. orientalis and S. validus) for domestic sewage treatment, also unplanted CW-MFC was performed as a control system. Macrophyte T...
July 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28674067/genome-scale-mutational-analysis-of-geobacter-sulfurreducens-reveals-distinct-molecular-mechanisms-for-respiration-and-sensing-of-poised-electrodes-vs-fe-iii-oxides
#18
Chi Ho Chan, Caleb E Levar, Fernanda Jiménez-Otero, Daniel R Bond
Geobacter sulfurreducens generates electrical current by coupling intracellular oxidation of organic acids to reduction of proteins on the cell surface that are able to interface with electrodes. This ability is attributed to the bacterium's capacity to respire other extracellular electron acceptors that require contact, such as insoluble metal oxides. To directly investigate the genetic basis of electrode-based respiration, we constructed Geobacter sulfurreducens transposon-insertion sequencing (Tn-Seq) libraries for growth with soluble fumarate or an electrode as the electron acceptor...
July 3, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28671824/exclusive-extracellular-bioreduction-of-methyl-orange-by-azo-reductase-free-geobacter-sulfurreducens
#19
Yi-Nan Liu, Feng Zhang, Jie Li, Dao-Bo Li, Dong-Feng Liu, Wen-Wei Li, Han-Qing Yu
Azo dyes are a class of recalcitrant organic pollutants causing severe environmental pollution. For their biodecolorization, the azo reductase system was considered as the major molecular basis in bacteria. However, the intracellular localization of azo reductase limits their function for efficient azo dye decolorization. This limitation may be circumvented by electrochemically active bacteria (EAB) which is capable of extracellular respiration. To verify the essential role of extracellular respiration in azo dye decolorization, Geobacter sulfurreducens PCA, a model EAB, was used for the bioreduction of methyl orange (MO), a typical azo dye...
July 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28662640/community-analysis-of-biofilms-on-flame-oxidized-stainless-steel-anodes-in-microbial-fuel-cells-fed-with-different-substrates
#20
Nweze Julius Eyiuche, Shiho Asakawa, Takahiro Yamashita, Atsuo Ikeguchi, Yutaka Kitamura, Hiroshi Yokoyama
BACKGROUND: The flame-oxidized stainless steel anode (FO-SSA) is a newly developed electrode that enhances microbial fuel cell (MFC) power generation; however, substrate preference and community structure of the biofilm developed on FO-SSA have not been well characterized. Herein, we investigated the community on FO-SSA using high-throughput sequencing of the 16S rRNA gene fragment in acetate-, starch-, glucose-, and livestock wastewater-fed MFCs. Furthermore, to analyze the effect of the anode material, the acetate-fed community formed on a common carbon-based electrode-carbon-cloth anode (CCA)-was examined for comparison...
June 29, 2017: BMC Microbiology
keyword
keyword
61140
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"