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14 rezultatima
Correlated visible-light absorption and intrinsic magnetism of SrTiO3 due to oxygen deficiency: bulk or surface effect?
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The visible-light absorption and luminescence of wide band gap (3.25 eV) strontium titanate (SrTiO3) are well-known, in many cases, to originate from the existence of natural oxygen deficiency in the material. In this study based on density functional theory (DFT) calculations, we provide, to the
Acceleration of segmental bone regeneration in a rabbit model by strontium-doped calcium polyphosphate scaffold through stimulating VEGF and bFGF secretion from osteoblasts.
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The development of suitable bioactive three-dimensional scaffold for the promotion of bone regeneration is critical in bone tissue engineering. The purpose of this study was to investigate in vivo osteogenesis of the porous strontium-doped calcium polyphosphate (SCPP) scaffolds for bone repair, as
Strontium- and cobalt-substituted bioactive glasses seeded with human umbilical cord perivascular cells to promote bone regeneration via enhanced osteogenic and angiogenic activities.
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Designing and developing new biomaterials to accelerate bone healing are currently under progress. In this study, we attempted to promote osteogenesis using strontium- and cobalt-substituted bioactive glasses (BGs) seeded with human umbilical cord perivascular cells (HUCPVCs) in a critical size
Enhancing Perovskite Electrocatalysis through Strain Tuning of the Oxygen Deficiency.
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Oxygen vacancies in transition-metal oxides facilitate catalysis critical for energy storage and generation. However, promoting vacancies at the lower temperatures required for operation in devices such as metal-air batteries and portable fuel cells has proven elusive. Here we used thin films of
Atmosphere-ocean oxygen and productivity dynamics during early animal radiations.
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The proliferation of large, motile animals 540 to 520 Ma has been linked to both rising and declining O2 levels on Earth. To explore this conundrum, we reconstruct the global extent of seafloor oxygenation at approximately submillion-year resolution based on uranium isotope compositions
[Alterations of cat papillary muscle mechanics induced by changes of preload under variation of physical and chemical parameters (author's transl)].
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A rapid change in length of cat papillary muscle induces two reciprocal diastolic and systolic processes: stretching causes a viscoelastic relaxation of the muscle. The opposite behavior is observed after abrupt releases when - subsequent to an increase in resting tension - diastolic force attains
States of myocardial metabolism related to ischemia.
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Energy metabolism of the heart in ischemia is mainly characterized by oxygen deficiency and lack of lactate removal. However, under certain circumstances substrate deficiency might contribute to disturbances of energy supply as well. Capillary permeability was determined from tracer washout kinetics
Alterations in tissue oxygen consumption and extraction after trauma and hemorrhagic shock.
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OBJECTIVE
Although trauma and hemorrhage are associated with tissue hypoperfusion and hypoxemia, changes in oxygen delivery (DO2), oxygen consumption VO2), and oxygen extraction at the organ level in a small animal (such as the rat) model of trauma and hemorrhage have not been examined. Therefore,
Clinical testing of the radiosensitiser Ro-07-0582. II. Radiosensitisation of normal and hypoxic skin.
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The effectiveness of the radiosensitiser Ro-07-0582 has been tested in man by observing the skin reaction after irradiation using a radio-strontium source with and without administration of the drug. The skin reaction technique has been extended so that skin was irradiated when at low oxygen tension
Reversible nano-structuring of SrCrO3-δ through oxidation and reduction at low temperature.
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Oxygen vacancies are often present in complex oxides as point defects, and their effect on the electronic properties is typically uniform and isotropic. Exploiting oxygen deficiency in order to generate controllably novel structures and functional properties remains a challenging goal. Here we show
Direct Observation and Analysis of CuO2 Shear Defects in La2-xSrxCuO4.
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Direct observations of CuO(2) sheet defect structures in superconducting La(2-x)Sr(x)CuO(4), with x in the range 0.05 crystallographic directions, by a pure shear mechanism
LaAlO3 stoichiometry is key to electron liquid formation at LaAlO3/SrTiO3 interfaces.
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Emergent phenomena, including superconductivity and magnetism, found in the two-dimensional electron liquid (2-DEL) at the interface between the insulators lanthanum aluminate (LaAlO3) and strontium titanate (SrTiO3) distinguish this rich system from conventional 2D electron gases at compound
Methane oxidation over mixed-conducting SrFe(Al)O3-delta-SrAl2O4 composite.
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The steady-state CH4 conversion by oxygen permeating through mixed-conducting (SrFe)0.7(SrAl2)0.3Oz composite membranes, comprising strontium-deficient SrFe(Al)O3-delta perovskite and monoclinic SrAl2O4-based phases, occurs via different mechanisms in comparison to the dry methane interaction with
Electron microscopy and electron probe analysis of mitochondrial cation accumulation in smooth muscle.
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The contractile responses to barium and the ultrastructure and ionic composition of mitochondria were studied in vascular smooth muscle. In normal rabbit portal anterior mesenteric vein (PAMV) and main pulmonary artery (MPA) smooth muscle mitochondria were frequently associated with the surface
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