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Showing 1 to 20 of 22 for “"Reoxidation"”.
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Enhancing Steel Cleanliness in Tundishes by applying Physical and Mathematical Modeling
… than a contaminator. It has been noticed that reoxidation of liquid steel from ambient air aspiration through the ladle slide gate, can seriously degrade the steel quality. As a preventive measure, the reoxidation-prone region is flooded with an inert gas such as argon to prevent aspiration of …
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Saisonale Redoxfronten im Kopplungsbereich zwischen Schwefel- Eisen- und Mangankreislauf im System Seewasser-Sediment-Grundwasser des Willersinnweihers
… um Methan. Ebenso ergaben sich Hinweise auf die Reoxidation von Sulfid im Porenwasser. Sie stellt eine zusätzlich Sulfatquelle dar, die die Sulfatreduktionsraten im Sediment beschleunigt. Diese höheren Reduktionsraten wurden durch die Messung der in situ Sulfatreduktionsraten bestätigt und damit …
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CHEMICAL AND PHYSICAL CHARACTERIZATION OF COMPLEX III; THE OXIDATIVE REACTION MECHANISM
… reaction mechanism was investigated through the reoxidation of 2-electron, 4-electron (CoO-depleted) and fully-reduced Complex III by ferricyanide. The nonlinear first-order plots of the oxidation of c(,1), were obtained for the reaction of 2-electron reduced sample at all tested ferricyanide …
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Evaluating Surface Mechanisms for Catalytic Combustion Of H2 and CH4 on Pd Catalysts
… to 850°C revealed the effects of PdO reduction/reoxidation on CH4 combustion kinetics. Test results with different H2O concentration revealed that competitive CH4 and H2O adsorption impacts on the activity only under catalyst conditions dominated by PdO. A detailed Pd-CH4-O2 surface mechanism …
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ΜΕΛΕΤΗ ΤΗΣ ΦΩΤΟΧΗΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΩΝ ΒΟΛΦΡΑΜΙΟΥ ΚΑΙ ΜΟΛΥΒΔΑΙΝΙΟΥ ΣΧΕΤΙΚΑ ΜΕ ΤΗΝ ΕΦΑΡΜΟΓΗ ΤΟΥΣ ΣΕ ΦΩΤΟΗΛΕΚΤΡΟΧΗΜΙΚΑ ΣΤΟ...
… THAT THE RATE OF PHOTOREDUCTION MATCHES THE BACK-REOXIDATION BY HYDROGEN.THE REDUCTION STEP AT WHICH THIS TAKES PLACE DEPENDS ON THE TUNGSTATE USED.
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Vergleichende methodische Untersuchungen zur Sauerstoffradikalbildung vaskulärer Zellen durch Angiotensin II und Lipoproteine
… während des Versuchsablaufs und die mögliche Reoxidation von bereits reduziertem Cytochrom C durch H2O2 und OH-. Dies kann zumindest partiell durch die Gabe von Katalase verhindert werden. Der Cytochrom C-Assay kann somit nur dann als Methode zur Messung von O2- herangezogen werden, wenn er …
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Redox-induzierte Speziesverteilung von Arsen im Eisenreduktionsmilieu hervorgerufen durch Catechol
… Arsen(V) zu Arsen(III) durch Catechol und eine Reoxidation des Arsen(III) an Eisenhydroxiden parallel zu einer Eisenreduktion durch Catechol auf. Aus dem Säulenversuch zur Arsenfreisetzung von Eisenhydroxid-Oberflächen durch Catechol ergab sich, dass adsorbiertes Arsen(V) zu Arsen(III) reduziert …
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Mechanisms Causing Ferric Staining in the Secondary Water System of Brigham City, Utah
… system. When this water is exposed to oxygen, reoxidation shifts redox equilibrium causing precipitation of soluble Fe(II) and Mn(III) back to highly insoluble Fe(III) and Mn(IV). The precipitant appears on contact surfaces as the aforementioned ferric stain. This research focuses specifically …
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Ligand-Driven Development of Pd-Catalyzed Nondirected C–H Activation of Arenes
… (HFIP). Although photoredox-based reoxidation strategies for silver replacement were unsuccessful, optimized catalyst systems employing NASA ligands enabled efficient reactions in non-halogenated and environmental benign solvents. Mechanistic studies highlighted the importance of …
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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
… showed that the reduction and subsequent reoxidation of structural Fe significantly changes local environment of Fe in the nontronite. The irreversibility became more pronounced as Fe reduction levels increased. FTIR analysis of redox-modified smectite structure revealed that the overall …
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Abiotic nitrate reduction by redox activated iron-bearing smectites
… with a dilute nitrate solution to observe reoxidation of the clay structure. This was paired with chemiluminescent nitrogen analysis of the dilute nitrate solution to determine that not only are these reduced clay samples capable of reducing nitrate, but also that the extent of reduction …
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ΚΑΤΑΛΥΤΙΚΗ ΟΞΕΙΔΩΣΗ ΤΟΥ ΔΙΟΞΕΙΔΙΟΥ ΤΟΥ ΘΕΙΟΥ ΣΕ ΤΗΓΜΑΤΑ ΑΛΑΤΩΝ. ΣΧΗΜΑΤΙΣΜΟΣ ΚΡΥΣΤΑΛΛΙΚΩΝ ΕΝΩΣΕΩΝ ΚΑΙ ΑΠΕΝΕΡΓΟΠΟΙΗΣΗ ΤΟΥ ΚΑΤΑΛΥΤΗ
… OF V(IV) AND V(III) PRECIPITATES LEADS TO REOXIDATION OF VANADIUM IN THE +V OXIDATION STATE. CERTAIN CONDITIONS REQUIRED FOR REACTIVATION OF DEACTIVATED CATALYSTS ARE POINTED OUT AND ARE DISCUSSED IN RELATION TO THE DISOLUTION OF THE PRECIPITATES IN THE MELTS.
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The isotope geochemistry of uranium: Igneous petrology, ore deposits, and groundwater contamination
… I am able to differentiate between uranium reoxidation, uranium desorption, and advection of uranium-bearing groundwater.
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Isoflurane : interaction with hepatic microsomal enzymes
… assessed by several criteria. Firstly, using the reoxidation of cytochrome b₅ as an index of fatty acid desaturase activity, isoflurane appears to interact with the Δ6- and/or Δ5-desaturases, but not the Δ9-desaturase. Secondly, these results were confirmed and clarified by the use of direct …
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Photon-assisted spectroscopy of electronic interface states in perovskite oxide heterostructures
… after heating in ultrahigh vacuum and reoxidation after heating in a pure oxygen atmosphere. Strong evidence for electron doping of the La0.7Ce0.3MnO3 film after deoxygenation was found. Furthermore, the reversible tunability of the Mn valence by variation of the oxygen content could be …
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Proteinmultischichten und Proteinmutanten für neuartige empfindliche Superoxidbiosensoren
… das Superoxidradikal und eine anschließende Reoxidation durch die Elektrode konnten nachgewiesen werden. In einem amperometrischen Messansatz wurde das durch Superoxidradikale hervorgerufene elektrochemische Signal in Abhängigkeit von der Zahl an Proteinschichten gemessen. Ein maximales …
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Coupling of Oxidation-Reduction Reactions of Chromium, Iron and Manganese: Implications for the Fate and Mobility of Chromium in Aquatic Environments
… of the Cr(III)-containing solids with respect to reoxidation under groundwater conditions. Manganese is ubiquitous in aquatic and terrestrial environments, and the redox cycling of manganese may significantly impact the fate and transport of chromium. Coupling of redox reactions of chromium, iron …
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Structural and Biochemical Studies of Streptococcus sp. alpha-Glycerophosphate Oxidase
… GlpDs are functionally different based on the reoxidation of the cofactor; GlpO reacts with O2 to form H2O2, while GlpD transfers the reducing equivalents to ubiquinone. GlpO and GlpD also differ in that GlpDs are considered membrane associated, while most GlpOs are considered cytosolic. The …
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Dynamics of soil processes under extreme meteorological boundary conditions - response of below-ground carbon, sulfur, and iron cycling in fen soils
… approach – could successfully be explained by a reoxidation of reduced iron and sulphur compounds, providing alternative electron accepting capacity during and after drought. Only after depletion of alternative electron acceptors, methanogenic conditions could re-establish. Locally, however, in …
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Development of an EQCM-based sensor for metal ions
… difficulties associated with the irreversibile reoxidation of the solid LMB generated at pH 7.9 will be obviated at pH I; and (b) being a large cation, we could expect LMBH22+ to be retained within the Nafion® layer.
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