Rare Case of Isolated Right Ventricle Myocardial Infarction

Скородумова, Е. Г.; Костенко, В. А.; Skorodumova, E. A.; Siverina, A. V.

doi:10.20333/2500136-2017-4-93-96

Cited by 3 publications

(6 citation statements)

References 1 publication

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“…During cooling the reformation of Ce(IV) displays a minimum in the derivative of Ce(III) concentration fraction at approximately 480 K suggesting significant undercooling is required. The XAS results suggest the localisation of an electron on the Ce(IV) ion occurs during heating in hydrogen to form Ce(III) in line with the proposed model 46 Significantly here the results of the LCF analysis of standard transmission geometry XAS experiments yields an identical ~15% Ce(III) formation as observed from peak area ratio analysis of the HERFD-XANES. This suggests that both applied methods (static and dynamic change in temperature) can accurately quantify the Ce(III) formation resulting from the interaction of ceria with hydrogen at elevated temperatures and reversible formation of Ce(IV) upon cooling in hydrogen.…”

Section: + →supporting

confidence: 83%

“…The formation of Ce(III), observed by XANES, can be stabilised via the localisation of an electron to the cerium ion as indicated by theoretical studies 46 . When within a hydrogen atmosphere the reduction of Ce(IV) to Ce(III) is proposed to be through the formation of a cerium oxyhydride at elevated temperatures.…”

Section: Discussionmentioning

confidence: 92%

“…Such behaviour has not been observed when heating in an oxygen atmosphere ( Figure S3). We propose that the suggested complex Ce(III)-Oxygen vacancy 46 coupled with an inclusion of hydrogen into the ceria lattice forming internal OH structures resulting in a cerium oxyhydride phase, 2 in the surface and subsurface layers of the Ceria leading to this unusual redox observations seen XAS and XTS measurements at elevated temperature.…”

Section: + →mentioning

confidence: 90%

“…When within a hydrogen atmosphere the reduction of Ce(IV) to Ce(III) is proposed to be through the formation of a cerium oxyhydride at elevated temperatures. This may arise from the formation of a hydroxyl structures in the surface and subsurface layers resulting in the lengthening of the Ce-O bond and in the localization of an electron onto the cerium ion 46 .…”

Section: Discussionmentioning

confidence: 99%

“…2− + 2 Therefore the oxidation of Ce(III) to Ce(IV) during cooling in hydrogen evidences that the majority of the Ce(IV) reduction occurring through an alternative process other than the removal of oxygen from the ceria lattice. Mamotov et al 45 reported that Oxygen ions can migrate to interstitial positions leaving vacancies near the cerium ions and some evidence is also given for localisation of electrons forming a Ce(III)-vacancy complex 46 .…”

Section: + →mentioning

confidence: 99%

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Unusual Redox Behavior of Ceria and Its Interaction with Hydrogen

et al. 2019

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The reaction between ceria and hydrogen has been subject to numerous theoretical and experimental studies due to its importance as a catalytic material. Here we present dynamic and reversible evolution of the cerium oxidation states observed through X-ray Absorption Spectroscopy experiments in addition to the investigation of associated lattice expansion and contraction through X-ray diffraction and PDF methods. Employing a novel calculation of the temperature dependence of the Gibbs free energy through consideration of the relationship between the instantaneous thermal lattice expansion and the rate of change of the cerium oxidation state, the unusual redox chemistry is reported here. This unusual behaviour is interpreted as due to the formation of a metastable cerium oxyhydride as suggested.

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Section: + →supporting

confidence: 83%

Section: Discussionmentioning

confidence: 92%

Section: + →mentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: + →mentioning

confidence: 99%

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Unusual Redox Behavior of Ceria and Its Interaction with Hydrogen

et al. 2019

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Reaction Pathway for Coke-Free Methane Steam Reforming on a Ni/CeO2 Catalyst: Active Sites and Role of Metal-Support Interactions

Salcedo¹,

Lustemberg²,

Rui³

et al. 2021

Preprint

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Methane steam reforming (MSR) plays a key role in the production of syngas and hydrogen from natural gas. The increasing interest in the use of hydrogen for fuel cell applications demands the development of catalysts with high activity at reduced operating temperatures. Ni-based catalysts are promising systems because of their high activity and low cost, but coke formation generally poses a severe problem. Studies of ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) indicate that CH4/H2O gas mixtures react with Ni/CeO2(111) surfaces to form OH, CHx and CHxO at 300 K. All these species are easy to form and desorb at temperatures below 700 K when the rate of the MSR process accelerates. Density functional theory (DFT) modeling of the reaction over ceria-supported small Ni nanoparticles predicts relatively low activation barriers between 0.3–0.7 eV for the complete dehydrogenation of methane to carbon and the barrierless activation of water at interfacial Ni sites. Hydroxyls resulting from water activation allow CO formation via a COH intermediate with a barrier of about 0.9 eV, which is much lower than that through a pathway involving lattice oxygen from ceria. Neither methane nor water activation are rate-determining steps, and the OH-assisted CO formation through the COH intermediate constitutes a low-barrier pathway that prevents carbon accumulation. The interaction between Ni and the ceria support and the low metal loading are crucial for the reaction to proceed in a coke-free and efficient way. These results could pave the way for further advances in the design of stable and highly active Ni-based catalysts for hydrogen production.

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Prognostic Value of St Segment Elevation in Additional Right Ecg Leads in Patients With Inferior Myocardial Infarction

2020

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The article presents data on the prognostic value of ST segment elevation on an electrocardiogram in additional right chest leads V 3 R-V 4 R during the acute period of myocardial infarction in patients with inferior wall myocardial infarction. The study included patients with inferior wall myocardial infarction (n=101) aged 34 to 85 years. Elevation of the ST segment in leads V 3 R-V 4 R ≥0.5 mV was observed in 35 patients (35%). It was revealed that the ST segment elevation in the V 3 R-V 4 R leads is an unfavorable prognostic sign in terms of the risk of arterial hypotension in the acute period of myocardial infarction, heart rhythm disturbances, and hemodynamically significant sinus bradycardia.

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Rare Case of Isolated Right Ventricle Myocardial Infarction

Cited by 3 publications

References 1 publication

Unusual Redox Behavior of Ceria and Its Interaction with Hydrogen

Unusual Redox Behavior of Ceria and Its Interaction with Hydrogen

Reaction Pathway for Coke-Free Methane Steam Reforming on a Ni/CeO2 Catalyst: Active Sites and Role of Metal-Support Interactions

Prognostic Value of St Segment Elevation in Additional Right Ecg Leads in Patients With Inferior Myocardial Infarction

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