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 20 of 54 for “"Redox cycling"”.
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Redox cycling of colloidal macro- and micro-nutrients in a monomictic lake
… bodies as they play an essential role in the cycling of nutrients and carbon, with impacts at the local and global scale. This study selected Lake Ngapouri, a small monomictic lake in the Waikiti Valley, Taupo Volcanic Zone, New Zealand, which receives a considerable amount of nutrients and …
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Studies on a catalytic cadogan cyclization by PI̳I̳I̳/PV̳=O redox cycling
… acyclic and 5-membered analogs for P(III)/P(V)=O redox cycling. A variety of substrates were found to successfully undergo catalytic Cadogan indazole cyclization. The mechanism of the cyclization has been expanded. The resting state of phosphorus was determined to be the P" phosphetane, and this …
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Influence of Iron Speciation on Redox Cycling and Reactivity With Persistent Organic Contaminants
… as surrogate models for studying iron-mediated redox processes. Initially, the redox reactivity of Fe II-organic ligand complexes with nitro-organic explosives was investigated. Ligand-screening experiments demonstrate that organic ligands containing catechol, thiol, and hydroxamate functional …
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Studies Toward the Development of a Microelectrode Array for Detection of Dopamine Through Redox Cycling
<p>Redox cycling is an electrochemical technique that cycles the reversible redox species between its oxidative states repeatedly on generator and collector electrodes. Two or more individually-addressable microelectrodes located close to each other allow redox cycling to be possible. …
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Evaluating redox cycling across the Toarcian Oceanic Anoxic Event with implications for paleo-environmental reconstructions and organic matter sulfurization
… Through utilization of iron speciation, a local redox proxy, I identify anoxia developing before and persisting well after the negative carbon isotope excursion (NCIE) conventionally used to define the T-OAE. These data indicate an increase in the occurrence of anoxia at the Pliensbachian – …
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Production of Light-independent Reactive Oxygen Species during Microbially-mediated Fe(II)/Fe(III) redox cycling and its Application in the Degradation of Organic Contaminants
… (•OH), represent transient reactants that are redox active and ubiquitous in aquatic systems. In the presence of Fe(II), H2O2 represents a potential source of •OH via the Fenton reaction, which is commonly used in remediation for organic contaminant degradation. The degradation of various …
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Microfabrication and Electrochemical Characterization of a Novel SU-8 Probe with an Array of Individually Addressable Electrodes Suitable for Redox Cycling Experiments in Ultra-small Volumes
<p>Redox cycling is an electrochemical technique that utilizes closely spaced generator and collector electrodes to cycle reversible redox species between their oxidative states. With advantages in signal amplification, selectivity of species based on their electrochemical reaction mechanism, and …
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Biochemical Thermodynamic Modelling of Cellular Bioenergetics: A Quantitative Systems Pharmacology Approach
… flux analysis in order to assess drug redox cycling and cellular bioenergetics. It is widely accepted that pharmacological activity of certain classes of drugs (e.g. anticancer, antimalarial) is related to their ability to accept one or two electrons. However, pharmacological activity …
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Development of Dual-Electrode Amperometric Detectors for Liquid Chromatography and Capillary Electrophoresis
… detection schemes were developed to investigate redox chemistries for endogenous and exogenous antioxidants that play key roles in maintaining tissue redox homeostasis under oxidative stress conditions. A parallel adjacent dual electrode detector was first proposed for liquid chromatography in …
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Development of Electrochemical Sensors Suitable for In Vivo Detection for Neurotransmitters
<p>The electrochemical method of redox cycling was exploited to achieve new discoveries in neurotransmitter detection and to advance its suitability toward in vivo use. Redox cycling has advantages in signal amplification, selectivity of species based on their electrochemical reaction mechanisms, …
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Superoxide stress in Escherichia coli
… a new class of cellular targets of O2-: non-redox mononuclear iron enzymes. These enzymes employ a ferrous iron atom [Fe(II)] as a solvent-exposed cofactor. Four such enzymes -- threonine dehydrogenase (Tdh), ribulose-5-phosphate 3-epimerase (Rpe), peptide deformylase (PDF), and DAHP synthase …
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Cycling studies of micro-tubular solid oxide fuel cells
… under transient conditions (i.e. thermal, redox and load cycling). During this operation, sintering was found to dominate the degradation mechanism, causing irreversible deformation and decreasing the power output without obvious micro-cracking taking place. With the bench mark for steady …
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The characterization of pharmacokinetic properties and evaluation of in vitro drug combination efficacies of novel antimalarial compounds
… of compounds known to induce oxidative stress by redox cycling combined with an artemisinin, which as an oxidant drug also induces oxidative stress but is unable to undergo redox cycling. Combination of the artemisinin with a redox-active compound is expected to both enhance and maintain oxidative …
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Structural and functional studies of mitochondrial NADH:ubiquinone oxidoreductase (complex I)
… The formation of semiquinones initiates redox cycling reactions with oxygen, producing vast amounts of reactive oxygen species; further studies revealed that other oxidants, such as paraquat, also react at the flavin site and initiate redox cycling reactions. Second, kinetic studies …
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Taphonomic studies of fossil preservation in coarse-grained siliciclastic environments
… in the presence of endogenous bacteria and the redox cycling of iron that included the microbial reduction of iron(III). We showed that the early precipitation of silica and the formation of microbial death masks is not critical for preservation. Additionally, when the degradation of soft …
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Polythiophene als sensitive Filme in chemischen Sensoren
… the electrochemical polymerisation and the redox cycling behaviour of the polymer films deposited on the liquid facing electrode of the quartz. This method is based on impedance analysis of a piezoelectric quartz crystal. The deposited polymer mass and surface roughness parameters were …
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The physiological role and characterization of melanin produced by Shewanella algae BrY
… melanin, when grown with tyrosine. The redox-cycling capabilities of melanin provide it with the ability to serve as a terminal electron acceptor and soluble electron shuttle for iron mineral reduction. When melanin is associated with the cell surface, it accelerates the rate of electron …
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STRUCTURAL AND CATALYTIC FEATURES AFFECTING INACTIVATION OF TYPICAL 2-CYS HUMAN PEROXIREDOXINS 2 AND 3
… such class of enzymes, human typical 2-cys peroxiredoxins, is involved in redox regulation through the cyclic oxidation and reduction of cysteine residues during its normal catalytic cycle. This redox cycling facilitates hydrogen peroxide (H2O2) based cell signaling, protects cells from oxidative …
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