Global ETD Search
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 11 of 11 for “"Bioreduction"”.
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Arsenic mobilization through bioreduction of iron oxide nanoparticles
Arsenic sorbs strongly to the surfaces of Fe(III) (hydr)oxides. Under aerobic conditions, oxygen acts as the terminal electron acceptor in microbial respiration and Fe(III) (hydr)oxides are highly insoluble, thus arsenic remains associated with Fe(III) (hydr)oxide phases. However, under anaerobic …
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Bioreduction of Hematite Nanoparticles by Shewanella oneidensis MR-1
A dissertation is presented on the bioreduction of hematite (α-Fe2O3) nanoparticles. The study shows that an alternative extracellular electron transfer mechanism other than the classical 'direct-contact' mechanism may be simultaneously employed by Shewanella oneidensis MR-1 during solid-phase …
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Interaction of methoxyethyl methyl imidazolium-based ionic liquids with uranium and its effect on bioreduction of uranium
… weak interaction. Next, the effect of ILs on the bioreduction of uranium by clostridium sp. was explored. The result revealed that, in presence of MOEMIMBF_4, most of the U(VI) and reduced U(IV) can be maintained in the aqueous phase for long time, while most of uranium precipitates out very …
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Function of multicopper oxidases adsorbed on gold nanoparticles /
… efficient direct electron transfer based oxygen bioreduction on electrode surface. Heterogeneous electron transfer speed in gold nanoparticle - laccase bioelectrocatalytic systems depended on nanoparticle size. In general, larger diameter (60 – 90 nm) gold nanoparticle systems exhibited slower …
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Numerical Modeling Of Dissimilatory Iron Reduction In Sediments At A Field Site
… rate formulations were proposed to describe the bioreduction rate of hematite, and two kinds of simulation were conducted to validate the formulations and parameters with both batch and column experimental data: a reaction-based biogeochemical (batch) modeling with BIOGEOCHEM 1.0 and a reactive …
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Interactions of ionic liquids with uranium and its implications on biotransformation
… > U+[EtPy][BF_4] and U+[EtPy][CF_3COO]. The bioreduction of U(VI) to U(IV) by Clostridium sp. was affected by the presence of ILs. The rate of reduction of U, in the absence or in the presence of the monodentate complexes U:[EtPy][BF_4] and U:[BMIM][PF_6] was similar. However, no reduction …
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Investigating uranium mobility using groundwater 238U/235U data and a reactive transport model
… suggests the potential to quantify the extent of bioreduction occurring in groundwater containing U using 238U/235U as a compliment to the information gained through U concentration measurements. A recent study of a U bioremediation experiment at a contaminated DOE site in Rifle, Colorado, applied …
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Uranium isotopic fractionation induced by U(VI) adsorption onto common aquifer minerals
… numerous sites in the western United States. Bioreduction of soluble, mobile U(VI) to U(IV)-bearing solids is a common remediation strategy. Uranium isotopes (238U/235U) have been utilized to track the progress of microbial reduction, with laboratory and field studies finding a ~1‰ isotopic …
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Noninvasive Temperature Measurements Using Electron Paramagnetic Resonance Spectroscopy
… thereby protecting the nitroxide from bioreduction and ensuring that the shape of the EPR spectrum is greatly affected by temperature in the range of the medium's liquid-solid transition. There was a hysteresis effect seen in the spectral lineshape for this system as the temperature was …
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The development of deoxynyboquinone as a personalized anticancer compound
… (ROS) selectively in cancer cells through a bioreduction/oxidation process mediated exclusively by NQO1. Excitingly, DNQ is effective at reducing the size of tumors in a mouse model of cancer. Unfortunately, DNQ must be delivered at concentrations near the maximum tolerated dose in mice to …
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Towards tandem bio-chemo catalytic systems for the activation of alkanes and subsequent oxidation of alcohols to aldehydes using biofabricated Pd and Au catalysts
… at the 5% (w/w) and 25% (w/w) loadings. Bioreduction for this metal was only observed with hydrogen as the electron donor on E. coli ATCC25922 with irregularly-shaped Au(0) nanoparticles between 20 nm and 40 nm being formed. Catalyst activity was assessed using the oxidation of benzyl …