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Showing 1 to 20 of 31 for “"iron oxidation"”.
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Does Sulfide Affect Short Term Iron Oxidation?
… overlapping potentials couple with the recurring oxidation and biogenic reduction of Fe species in coastal environments to allow ROS to catalytically link the redox cycles of those elements and others. This coupling occurs over long (days) and short (seconds) time scales and represents a …
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Investigation of the Iron Oxidation Kinetics in Mantua Reservoir
… the source of the staining was the reduction of iron found in Mantua Reservoir sediments that occurred when seasonal variations in the reservoir caused anaerobic conditions. The reduced iron then dissolved in the water and was used in the irrigation system, causing re-oxidation of the iron. The …
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Identification And Analysis Of Genes Involved In Anaerobic Nitrate-Dependent Iron Oxidation
… released into aquatic and terrestrial environments by mining, industrial processes, and municipal waste disposal practices is an area that deserves significant scientific, public health, and regulatory attention. Indirect microbial interaction offers one potential mechanism for …
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An electrochemical and surface analytical investigation of iron oxidation, passivation and corrosion inhibition
… electrochemical and surface analytical study of iron oxidation, passive film formation and corrosion inhibitor interaction is presented. Ultrahigh vacuum surface analysis by Auger electron spectroscopy (AES), low energy electron diffraction (LEED), thermal desorption mass spectrometry (TDMS) and …
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Pesticide Adsorption and Degradation Properties as Influenced by Iron Oxidation State in Clay Minerals
Reduction of structural Fe in the clay greatly increased the adsorption and produced substantial degradation of all pesticides. When reacted with chemically treated clays, the total amount of atrazine removed from solution by the reduced clay was much greater than by the oxidized or reoxidized …
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An investigation of the kinetics of thermophilic microbial ferrous iron oxidation in continuous culture
… of the mechanistic process involved. Ferrous iron oxidation has been established as a key step in bioleaching and is understood to be achieved largely by microbial action. The objective of this work was to determine an appropriate set of kinetic expressions that describe the rates of microbial …
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Iron oxidation coupled with biodegradation of organic contaminants in a simulated ground water system
… water contains high concentrations of reduced iron, competition for oxygen may occur. This study was designed to study this competition. The oxidation of iron and biodegradation of organics was studied in a 12 in X 2.5 in soil column by injecting either oxygen microbubbles or hydrogen peroxide …
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Mechanisms of Iron Oxidation in the Ferroxidase Centre of Escherichia coli Bacterioferritin: A Comparison to Other Ferritins
Ferritins are iron storage proteins that are both widespread and abundant in nature, being an essential means of solubilising and storing iron in a non-toxic manner for most organisms. While ferritins have been known and studied since the mid-20th century, it has become increasingly clear that …
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Effects of structural iron oxidation state on the hydraulic conductivity and potassium fixation of smectite clays and soils
Restricted to the U of I community indefinitely during batch ingest of legacy ETDs
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The effects of solution conditions on the kinetics of microbial ferrous-iron oxidation by Leptospirillum ferriphilum in continuous culture
… pH, dissolved Al and Mg, and the effect of total iron concentration on the kinetics of microbial ferrous-iron oxidation by Leptospirillum ferriphilum, with a view to developing a comprehensive rate equation.
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An investigation into the use of batch experiments in the determination of the kinetics of ferrous-iron oxidation by Leptospirillum ferrooxidans
… of temperature and pH on the bacterial ferrous-iron oxidation by Leptospirillum ferrooxidans in batch culture and compare these results with those previously obtained in continuous culture. An additional objective was to assess the validity of a variable maintenance equation by a re-evaluation …
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Iron oxidation in (Mg,Fe)0: Calibration of the Flank method on synthetic samples and applications on natural inclusions from lower mantle diamonds
(Mg,Fe)O ferropericlase is the most common mineral found in diamonds originating in the lower mantle (more than 50% of occurrences). It is well known that the Fe3+ concentration in (Mg,Fe)O is sensitive to oxygen fugacity, even at high pressures. Therefore, the determination of Fe3+/Fetot in such …
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IDENTIFICATION AND ANALYSIS OF PROTEINS AND GENES RESPONSIBLE FOR MICROBIAL ANAEROBIC NITRATE-DEPENDENT IRON OXIDATION AND OVEREXPRESSION IN E. coli OF PERCHLORATE REDUCTASE
<p>SECTION 1 Iron is the fourth most abundant element on the earth crust as well as an essential nutrient for all living organisms. The cycling of iron between the environment and biological systems and the microbial-mediated transformation between Fe2+ and Fe3+ has a significant impact on the …
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The Effects of Iron Oxidation State on Surface Chemistry and Structure of Iron-Bearing Smectites: Cation Fixation and Selectivity, Structural Iron Environment, and Dissolution
… this study was to investigate the effects of the oxidation state of structural Fe on cation fixation and selectivity and smectite structure. Experimental results revealed that reductive K fixation in smectite suspension occurs under the condition that K was present in the interlayer prior to or …
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The kinetics of ferrous iron oxidation by Leptospirillum-like bacteria in absence and in presence of pyrite and pyrite/arsenopyrite mixtures in continous and batch cultures
… mineral sulphide is chemically leached by ferric iron into the metal ion and sulphate and ii) the bacteria regenerate ferric iron. The kinetic parameters of these subprocesses are determined in presence of Leptospirillum-like bacteria as the main ferrous iron oxidizing bacterium. The bacterial …
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The microbiology of mining leach liquor regeneration
… of Thiobacillus ferrooxidans independently of iron oxidation was developed. This method involved the analysis of protein using the Cobmassie Blue protein-binding assay. It was found to be free from interference by the inorganic ions present in T. ferrooxidans culture medium. The effect of …
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Microbial dynamics of bioleaching consortia
… mineral sources and a push towards more environmentally sustainable production in the mining sector, there has been an increased interest in the use of historic tailings and electronic wastes for metal retrieval. Bioleaching is considered a suitable method for metal recovery from these …
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An investigation into the effects of preleach time period, nitrogen supplementation and iron concentration on bioleaching performance
… degree of microbial colonisation, a low ferrous iron oxidation rate and low microbial proliferation rates, ultimately resulting in a poor copper recovery rate.
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Inhibition of Thiobacillus ferrooxidans using antibiotics and antibacterial substances
… controls were maintained. Inhibition of iron oxidizing bacteria was recorded in terms of changes in Eh of the medium treated with the compound. Seven antibiotics (A38533A:, A38533B, 197506, 13780, 171541, chloramphenicol and cephalexin) and the two antibacterial substances …
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Studies in biotic persistence and the taxonomic stability of traits over geological time
… scytonemin, and Chapter 4 considers microbial iron oxidation. In these two chapters, I describe a metric called “clade fidelity” of a trait to describe its tendency to be associated with certain lineages and vertically inherited within them throughout the trait’s history, and I examine the …
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