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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Geobacter"”.
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Manganese dioxide reduction kinetics by Geobacter sulfurreducens and associated biofilm morphology in a flow-through reactor
… reduction kinetics of manganese dioxide using Geobacter sulfurreducens, an extensively studied DMRB, with acetate as the electron donor. At low flow rates, a yield of 3.44x1010 ± 2.54x1010 cells/mmol MnO2 was calculated and a maximum specific growth rate of 0.02 1/hr was estimated. The half …
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Spectroscopic Studies of Abiotic and Biological Nanomaterials: Silver Nanoparticles, Rhodamine 6G Adsorbed on Graphene, and c-Type Cytochromes and Type IV Pili in Geobacter sulfurreducens
… by the dissimilatory metal-reducing bacterium Geobacter sulfurreducens. Although these systems are quite different in some ways, they can all be considered examples of nanomaterials. A nanomaterial is generally defined as having at least one dimension below 100 nm in size. Silver nanoparticles, …
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Crystallographic studies on diheme cytochrome <i>c</i> enzymes
… wie z.B. Sauerstoff, Nitrat oder Sulfat. Da Geobacter-Arten zu den vorherrschenden Mikroorganismen in vielen Bodenhabitaten gehören, wo die dissimilatorische Metallreduktion den dominierenden Stoffwechelprozess darstellt, ist der Elektronentransport innerhalb der Bakterien zu den unlöslichen …
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Microbial transformation of arsenic in Bengal floodplain
… to Pleistocene soil. Metagenomics indicated that Geobacter, an anaerobic arsenic resistant organism, was most abundant in Holocene paddy soil. The functional genes related to arsenic reduction and resistance (arsC, araA/arsB, ACR3) were also shown to be most widely distributed in Holocene paddy …
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Design and testing of a microbial fuel cell for the conversion of lignocellulosic biomass into electricity
… contains cellulose-degrading microorganisms, and Geobacter metallireducens, resulted in Pmax values of 77 mW/m3 and 159 mW/m3, respectively. Analysis of hydrogen, methane, organic acids, and the mass of substrate consumed provided insight into the relationship between cellulose oxidation, …
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Long-range extracellular electron transport by dissimilatory metal-reducing bacteria across a physical separation
… of birnessite by microbial nanowires using Geobacter sulfurreducens KN400. The nanoporous wall in these experiments was composed of an array of pillars separated by <200 gaps (i.e. nanopores) to provide nanowires access to the entire depth of deposited birnessite. Using optical microscopy …
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Electrochemical wiring of cyanobacteria to anodes using polymers towards biohybrid devices for solar-chemical production
… performs light-driven water oxidation, to a Geobacter-based cathode, which reduces fumarate to succinate during respiration. Despite our efforts, we were unable to confirm electrons derived from water oxidation were ultimately used to produce succinate, due to complex and overlapping …
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Arsenic mobilization through bioreduction of iron oxide nanoparticles
… and an Fe(III)-reducing microorganism, Geobacter metallireducens. Results show that arsenic mobility is strongly controlled by microbially-mediated disaggregation of arsenic-bearing iron nanoparticles. The most likely controlling mechanism of this disaggregation of iron oxide …
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Enhanced biohydrogen production and substrate utilization by co-culture fermentation with reduced extracellular electron shuttles
… Clostridium beijerinckii was co-cultured with Geobacter metallireducens in the presence of the reduced extracellular electron shuttle anthrahydroquinone-2, 6-disulfonate (AH2QDS). In the co-culture fermentation system, increases of up to 52.3% for maximum cumulative hydrogen production, 38.4% …
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Isolation and Ecology of Bacterial Populations Involved in Reductive Dechlorination of Chlorinated Solvents
… the new isolate is affiliated with the genus Geobacter most closely related to G. thiogenes. Strain SZ is capable of stepwise dechlorination of PCE to cis-DCE, while the closest relatives were not able to dechlorinate PCE or TCE. Dechlorination of PCE or TCE by strain SZ was supported by …
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Electrical-phenotyping of the bacterial envelope using microfluidics
… variant electrochemical activities, including Geobacter sulfurreducens, Shewanella oneidensis, and Escherichia coli heterologously expressing Shewanella EET pathways. We also applied 3DiDEP to achieve rapid quantification of LPS, the major component and virulence determinant in Gram-negative …
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Effect of soil amendments on the chemical transformation of arsenic and the microbial diversity in rice paddy microbiome
… abundant genus in rhizosphere soil and shoot and Geobacter was the most relatively abundant in rice root. Geobacter, Clostridium, Anaeromyxobacter, Opitutus, Desulfocapsa, Methylocystis and Gemmatimonas were relatively abundant in all three compartments. Some of these have arsenic detoxification …
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Extracellular Electron Shuttle Mediated Biodegradation of Hexahydro-1,3,5-trinitro-1,3,5-triazine
… compounds. This study demonstrated that Geobacter metallireducens, a model Fe(III)- and electron shuttle-reducing microorganism, utilize electron shuttles to stimulate cyclic nitramine reduction at rates significantly faster than those previously reported. This work was the first to …
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Biosorption of uranium and its effect on uranium transport in groundewater
… between U(VI) and the microbial species Geobacter uraniireducens and Acholeplasma palmae were experimentally determined. The experimentally obtained partition coefficients were used to incorporate biosorption into a thermodynamic model that describes the distribution of uranium in a …
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Investigation of Rhenium's Biogeochemistry
… sulfate reducers used in my experiments: <italic>Geobacter metallireducens<italic> GS-15, <italic>Shewanella oneidensis<italic> €MR-1, <italic>Desulfovibrio desulfuricans<italic> subsp. <italic>desulfuricans<italic> and <italic>Desulfovibrio desulfuricans<italic> ND132. I concluded that …
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Iron reduction mediated increases in carbon oxidation and phosphorus precipitation in on-site wastewater systems
… growth experiments in ferric citrate media with Geobacter metallereducens clearly showed extensive iron reduction and subsequent phosphate (>97.5% or higher) removal in presence of electron donor. Both TEM-EDAX and XRD techniques confirm the precipitant as vivianite when additional Fe2+ was …
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Integrating photosystem II and electroactive bacteria with three-dimensional electrodes for semi-artificial photosynthesis
… electrode to accommodate metal-reducing bacteria Geobacter sulfurreducens and Shewanella loihica. Their colonisation and current production in electrodes arising from anaerobic respiration are studied. Chapter 6 utilises the resulting biohybrid electrodes to drive reducing reactions within and …
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Structural and biochemical characterization of diheme <i>c</i>-type cytochromes
… DHC2 aus dem anaeroben Mikroorganismus Geobacter sulfurreducens wurde in dem Bakterium Escherichia coli überexprimiert und mittels Affinitätschromatographie bzw. Gelfiltrationschromatographie bis zur Homogenität aufgereinigt. Das Protein wurde mittels UV/Vis-Spektralphotometrie, …
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Microbial diversity and groundwater chemistry in a pristine aquifer
… of 0.2 mM or less, where clones classified as Geobacter, Geothrix, or Desulfuromonas represent more than half of all sequences analyzed. We observed, in contrast, no statistically significant relationship between the structure of the bacterial community and the concentration of either ferrous …
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Application of Surface Enhanced Raman Spectroscopy to Biological Systems
… Untersuchung von Biofilmen des Bakteriums Geobacter Sulfurreducens demonstriert. Dies ist möglich, da das Bakterium eine Reihe von Multihämproteinen, sogenannten "outer membrane cytochromes" (Omcs), besitzt, die für den extrazellulären Elektronentransfer verantwortlich sind. Besonders stark …
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