Search results for "DEFICIENT"
showing 10 items of 75 documents
Structural inhomogeneity of Ge-doped amorphous SiO2 probed by photoluminescence lifetime measurements under synchrotron radiation.
2007
We report a study of the photoluminescence (PL) time decay of the B-type center, characterized by an optical absorption band peaked at similar to 5.2 eV and two related PL bands peaked at similar to 3.2 eV and similar to 4.3 eV, in sol-gel Ge-doped a- SiO2 under excitation by synchrotron radiation. Measurements were carried out by excitation in UV and in vacuum-UV (VUV), and were performed in the temperature range from 8 K up to 300 K in order to isolate the effects of the intersystem-crossing process, proposed to link the two emission bands of the center. Repeating the time decay measurement at several emission energies falling inside the 4.3 eV band, we have observed a variation of the PL…
Isoelectronic series of oxygen deficient centers in silica: experimental estimation of homogeneous and inhomogeneous spectral widths
2008
We report nanosecond time-resolved photoluminescence measurements on the isoelectronic series of oxygen deficient centers in amorphous silica related to silicon, germanium and tin atoms, which are responsible of fluorescence activities at approximately 4 eV under excitation at approximately 5 eV. The dependence of the first moment of their emission band on time and that of the radiative decay lifetime on emission energy are analyzed within a theoretical model able to describe the effects introduced by disorder on the optical properties of the defects. We obtain separate estimates of the homogeneous and inhomogeneous contributions to the measured emission line width, and we derive homogeneou…
Understanding the clinical behavior of relapsed colon cancers with microsatellite instability relative to BRAF mutations
2019
Background Microsatellite instable/deficient mismatch repair (MSI/dMMR) metastatic colorectal cancers have been reported to have a poor prognosis. Frequent co-occurrence of MSI/dMMR and BRAFV600E complicates the association. Patients and methods Patients with resected stage III colon cancer (CC) from seven adjuvant studies with available data for disease recurrence and MMR and BRAFV600E status were analyzed. The primary end point was survival after recurrence (SAR). Associations of markers with SAR were analyzed using Cox proportional hazards models adjusted for age, gender, performance status, T stage, N stage, primary tumor location, grade, KRAS status, and timing of recurrence. Results A…
centers induced by γ irradiation in sol–gel synthesized oxygen deficient amorphous silicon dioxide
2007
The effects of room temperature γ-ray irradiation up to a dose of ∼1300 kGy are investigated by Electron paramagnetic resonance (EPR) measurements in amorphous silicon dioxide (a-SiO2) produced by a sol-gel synthesis method that introduces O{triple bond, long}Si{single bond}Si{triple bond, long}O oxygen deficiency. We have found that exposure to radiation generates the Eγ′ center with the same spectral features found in high purity commercial a-SiO2. The maximum concentration of defects induced in this sol-gel material indicates that its resistance to radiation is comparable to that of synthetic fused a-SiO2. The concentration of Eγ′ center increases with irradiation, featuring a sublinear …
Mboat7 down-regulation by hyper-insulinemia induces fat accumulation in hepatocytes.
2020
Background: Naturally occurring variation in Membrane-bound O-acyltransferase domain-containing 7 (MBOAT7), encoding for an enzyme involved in phosphatidylinositol acyl-chain remodelling, has been associated with fatty liver and hepatic disorders. Here, we examined the relationship between hepatic Mboat7 down-regulation and fat accumulation. Methods: Hepatic MBOAT7 expression was surveyed in 119 obese individuals and in experimental models. MBOAT7 was acutely silenced by antisense oligonucleotides in C57Bl/6 mice, and by CRISPR/Cas9 in HepG2 hepatocytes. Findings: In obese individuals, hepatic MBOAT7 mRNA decreased from normal liver to steatohepatitis, independently of diabetes, inflammatio…
Revista de logopedia, foniatría y audiología
1999
La publicación recoge resumen en Inglés Los sordos profundos prelocutivos al acabar la escolaridad obligatoria (16-18 años), no superan como medial el nivel lector correspondiente a la población normo-oyente de diez años, de modo que un porcentaje muy reducido de ellos puede acceder a estudios medios y superiores. Con el fin de conocer las características personales y el nivel lector de los deficientes auditivos que llegan a cursar estudios superiores, se ha explorado a un grupo de 15 estudiantes de distintas facultades de la Universidad de Valencia, que sufren pérdidas auditivas de diverso tipo, y se les ha comparado con un grupo de 15 universitarios normo-oyentes, y con un grupo de siete …
Luminescence of oxygen related defects in zirconia nanocrystals
2007
The luminescence of undoped tetragonal structure ZrO2 nanocrystals was studied. The luminescence intensity depends on oxygen content in gases mixture in which the nanocrystals were annealed. The distorted Zr-O bond is suggested to be the recombination center for band carriers. The oxygen deficient defect is proposed to be responsible for photoluminescence. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Representation of disabilities in Physical Education textbooks image: inclusion or exclusion?
2017
El objetivo de la investigación es mostrar cómo se representan las personas con discapacidad en las imágenes de los libros de texto de Educación Física en la etapa de Educación Primaria. El estudio es de tipo empírico, descriptivo y comparativo entre los libros de texto analizados. La muestra recogió 3836 imágenes de libros de texto publicados en España entre los años 2006 y 2013, bajo la Ley Orgánica de Educación (LOE). La técnica de investigación fue el análisis de contenido a través de un sistema de categorías elaborado ad hoc, previa validación y fiabilidad mediante una prueba piloto, una consulta a expertos/as y una prueba intercodificadores. Para el análisis estadístico se utilizó el …
Angular momentum population in fragmentation reactions
2009
Neutron-deficient nuclei with N = 126 have been populated following projectile fragmentation of a 238U beam with energy 1 GeV/A. The decay of several previously reported isomers has been measured. This will allow us to calculate high-spin isomeric ratios and compare them with model calculations to allow a better understanding of the reaction mechanism. Algora, Alejandro, Alejandro.Algora@ific.uv.es ; Molina Palacios, Francisco Manuel, Francisco.Molina@ific.uv.es ; Rubio Barroso, Berta, Berta.Rubio@ific.uv.es
Avaluació de l'accessibilitat cognitiva d'una escola
2023
El document presenta l'enunciat d'un treball per a les assignatures de necessitats educatives especials i intervenció en discapacitat intel·lectual dels graus de Mestre/a en Educació Infantil i Mestre/a en Educació Primària. El treball consisteix en: a) avaluar l'accessibilitat cognitiva d'una escola; i b) elaborar un informe en el qual s'identifiquen les barreres relacionades amb accessibilitat cognitiva i continga proposades per a eliminar-les. L'activitat es planteja com una experiència d'aprenentatge servei en la qual es produeix un benefici real per a les escoles col·laboradores.