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 72 for “"Sulfite"”.
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Sulfite reductase and thioredoxin in oxidative stress responses of methanogenic archaea
… that certain methanogens use an unusual sulfite reductase, named F420-dependent sulfite reductase (Fsr), for the detoxification of SO32- that is produced outside the cell from a reaction between oxygen and sulfide. This reaction occurred during early oxygenation of Earth and continues to …
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Manometric determination of the biochemical oxygen demand of sulfite paper mill wastes
In nearly all chemical industries the problem of wastes is one of importance, and in any scientific study of waste disposal, the concept of the B.O.D. of the waste is vital. The B.O.D. is usually measured by an arbitrary standard test procedure, but may be determined by manometric measurement of …
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Understanding the Effects of Higher-Order Assembly on the Structure of Sulfite Reductase
… to their oxidase partners. Assimilatory sulfite reductase (SiR) is an NADPH-dependent multidomain oxidoreductase that catalyzes sulfur reduction to produce sulfide, the bioavailable form of sulfur for subsequent synthesis of biomolecules. In Escherichia coli, SiR is a dodecameric …
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Biochemical oxygen demand reduction of semi-chemical neutral sulfite waste by heat hydrolysis
… B.O.D. reduction up to 80 percent when used on sulfite waste at Oregon State College and it was hoped that similar results could be obtained using S.N.W. liquor. The exper1mental part of the investigation was conducted to determine (1) it the B.O.D. content of S.N.W. liquor could be reduced by …
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Developing assays to study and screen engineered Escherichia coli NADPH-dependent sulfite reductase
… variants. The Escherichia coli NADPH-dependent sulfite reductase is a heterododecameric complex that mediates one of the three known six-electron reductions in biological systems, catalyzing the reduction of sulfite to sulfide. Its higher order structure consists of an oxidative flavoprotein …
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Quantifying the expression of dissimilatory sulfite reductase as a metric for sulfate reduction rates
… whether the gene expression of dissimilatory sulfite reductase (dsr mRNA), a critical enzyme in the sulfate reduction pathway, can serve as an indicator of the rate of sulfate reduction in natural systems. We grew Desulfovibrio vulgaris in fed-batch reactors under electron-donor limiting …
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Anti-Inflammatory Effect of Sulfur Dioxide and Sulfite on Cigarette Smoke Exposed Human Airway Smooth Muscle Cells
Sulfur dioxide is an endogenously produced gas, once thought to be solely toxic. More recent studies have demonstrated that at physiological concentrations however it can also have beneficial effects, such as inhibition of inflammation, vasodilation, and relaxation of smooth muscle. Airway smooth …
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Anti-Inflammatory Effect of Sulfur Dioxide and Sulfite on Cigarette Smoke Exposed Human Airway Smooth Muscle Cells
Sulfur dioxide is an endogenously produced gas, once thought to be solely toxic. More recent studies have demonstrated that at physiological concentrations however it can also have beneficial effects, such as inhibition of inflammation, vasodilation, and relaxation of smooth muscle. Airway smooth …
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Management Strategies for Natural Cider Fermentation: Effects of sulfite addition and acidification in high- and low- tannin cultivars
… determine the effect of common pre-fermentation sulfite addition and pH adjustment on cider chemistry and sensory outcomes for naturally fermented high- and low-tannin apple cultivars. Four treatment conditions were applied to both the high- and the low- tannin cultivars: acidification only, …
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Adaptation of Candida albicans to Reactive Sulfur Species
… caused by reactive sulfur species (RSS), such as sulfite, produced by C. albicans, sulfate-reducing commensal microbes, and the host immune system. From a collection of transcription factor deletion mutants, only the mutant lacking the zinc cluster factor gene ZCF2 was found to be specifically …
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Structural characterization of glycyl radical enzymes in the human gut microbiome
… cleavage of isethionate by the GRE isethionate sulfite-lyase (IslA) generates sulfite, a substrate for sulfite respiration that in turn produces the disease-associated metabolite hydrogen sulfide. In this thesis, I present and describe an X-ray crystal structure of IslA from Bilophila …
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Antioxidant responses of pea (Pisum sativum L.) protoplasts
… stress at the whole plant level were used. Sulfite and the superoxide generating herbicide, paraquat, were used as the oxidants. Final sulfite concentrations during photosynthetic incubations ranged from 1.5 mM to 30.0 mM. During the polarographic estimation of photosynthesis, CO₂-dependent …
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Photochemical processes in engineered aquatic systems for remediation of per- and polyfluoroalkyl substances and algae cultivation
… thesis investigates (1) the application of a UV-sulfite photochemical treatment process for per- and polyfluoroalkyl substances (PFASs) destruction, and (2) the generation of photochemically produced reactive species in algal cultivation systems where cells excrete light-absorbing extracellular …
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Isolation of low ethanol producing yeast strains using adaptive evolution
… were derived from. Sub-lethal concentrations of sulfite, which sequesters acetaldehyde, thereby limiting ethanol production, was used as a selection pressure. However, removal of acetaldehyde not only limits ethanol production, it also compromises redox balance by preventing the fermentative …
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Effects Of Environmental Factors On Anaerobic Granular Sludge In Upflow Anaerobic Sludge Blanket Reactors
… extract and vitamins. High concentrations of sulfite in the feed also favoured bacterial growth rate. High bacterial growth rates in the reactors increased organic matter inside the granules and negatively affected the granule settling properties. By contrast, inorganic cations in the feed, …
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Time-Lapse Polymerizations Triggered by pH clock Reactions
… here. The second chapter focuses on the bromate-sulfite clock reaction. Based on some simplified and accepted reaction equations for the bromate-sulfite clock. We presumed it may be possible to increase the pH of the solution via ammonia addition and hinder or significantly reduce the reactivity …
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Investigating the thermal behavior differences between beet and cane sugar sources
… analysis, pH, conductivity ash content, total sulfite content measurements, single crystal X-ray diffraction (SXRD), X-ray Micro-Computed Tomography (MicroCT), Differential Scanning Calorimetry (DSC), High Performance Liquid Chromatography (HPLC), and Confocal Raman imaging and spectroscopy. …
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