Angle-resolved photoemission study and first principles calculation of the electronic structure of GaTe

The electronic band structure of GaTe has been calculated by numerical atomic orbitals density-functional theory, in the local density approximation. In addition, the valence-band dispersion along various directions of the GaTe Brillouin zone has been determined experimentally by angle-resolved photoelectron spectroscopy. Along these directions, the calculated valence-band structure is in good concordance with the valence-band dispersion obtained by these measurements. It has been established that GaTe is a direct-gap semiconductor with the band gap located at the Z point, that is, at Brillouin zone border in the direction perpendicular to the layers. The valence-band maximum shows a marked \textit{p}-like behavior, with a pronounced anion contribution. The conduction band minimum arises from states with a comparable \textit{s}- \textit{p}-cation and \textit{p}-anion orbital contribution. Spin-orbit interaction appears to specially alter dispersion and binding energy of states of the topmost valence bands lying at $\Gamma$. By spin-orbit, it is favored hybridization of the topmost \textit{p}$_z$-valence band with deeper and flatter \textit{p$_x$}-\textit{p$_y$} bands and the valence-band minimum at $\Gamma$ is raised towards the Fermi level since it appears to be determined by the shifted up \textit{p$_x$}-\textit{p$_y$} bands.Comment: 7 text pages, 6 eps figures, submitted to PR

New polymorph of InVO4: A high-pressure structure with six-coordinated vanadium

This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Inorganic Chemestry, copyright © American Chemical Society after peer review. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/ic402043xA new wolframite-type polymorph of InVO4 is identified under compression near 7 GPa by in situ high-pressure (HP) X-ray diffraction (XRD) and Raman spectroscopic investigations on the stable orthorhombic InVO4. The structural transition is accompanied by a large volume collapse (Delta V/V = -14%) and a drastic increase in bulk modulus (from 69 to 168 GPa). Both techniques also show the existence of a third phase coexisting with the low- and high-pressure phases in a limited pressure range close to the transition pressure. XRD studies revealed a highly anisotropic compression in orthorhombic InVO4. In addition, the compressibility becomes nonlinear in the HP polymorph. The volume collapse in the lattice is related to an increase of the polyhedral coordination around the vanadium atoms. The transformation is not fully reversible. The drastic change in the polyhedral arrangement observed at the transition is indicative of a reconstructive phase transformation. The HP phase here found is the only modification of InVO4 reported to date with 6-fold coordinated vanadium atoms. Finally, Raman frequencies and pressure coefficients in the low- and high-pressure phases of InVO4 are reported.This research supported by the Spanish government MINECO under Grant Nos. MAT2010-21270-C04-01/04 and CSD2007-00045. O.G. acknowledges support from Vicerrectorado de Investigacion y Desarrollo of UPV (Grant No. UPV2011-0914 PAID-05-11 and UPV2011-0966 PAID-06-11). S.N.A. acknowledges support provided by Universitat de Valencia during his visit to it. B.G.-D. acknowledges the financial support from MINECO through the FPI program.Errandonea, D.; Gomis Hilario, O.; García-Domene, B.; Pellicer Porres, J.; Katari, V.; Achary, SN.; Tyagi, AK.... (2013). New polymorph of InVO4: A high-pressure structure with six-coordinated vanadium. Inorganic Chemistry. 52(21):12790-12798. https://doi.org/10.1021/ic402043xS1279012798522

Structural and Vibrational Properties of Corundum-type In2O3 Nanocrystals under Compression

This work reports the structural and vibrational properties of nanocrystals of corundum-type In2O3 (rh-In2O3) at high pressures by using angle-dispersive x-ray diffraction and Raman scattering measurements up to 30 GPa. The equation of state and the pressure dependence of the Raman-active modes of the corundum phase in nanocrystals are in good agreement with previous studies on bulk material and compare nicely with theoretical simulations on bulk rh-In2O3. Nanocrystalline rh-In2O3 showed stability under compression at least up to 20 GPa, unlike bulk rh-In2O3 which gradually transforms to the orthorhombic Pbca (Rh2O3-III-type) structure above 12-14 GPa. The different stability range found in nanocrystalline and bulk In2O3 is discussed

El entrenamiento de fuerza reduce la acidosis metabólica y la hipertrofia hepática y renal consecuentes del consumo de una dieta hiperproteica en ratas Resistance training reduces the metabolic acidosis and hepatic and renal hypertrophy caused by the consumption of a high protein diet in rats

Introducción: El consumo de dietas hiperproteicas (HP) podría tener un efecto adverso sobre la acidosis metabólica y la salud hepática y renal. Sin embargo, existen pocos estudios que analicen los efectos del entrenamiento de fuerza sobre los parámetros sensibles de ser alterados por dichas dietas. Material y métodos: Un total de 32 ratas Wistar adultas fueron distribuidas de forma aleatoria en 4 grupos experimentales (n = 8): dieta normoproteica o HP, con o sin entrenamiento de fuerza. Las dietas estuvieron basadas en un hidrolizado de proteína de lactosuero (whey). Tras 90 días de diseño experimental los animales fueron sacrificados para los posteriores análisis. Resultados y discusión: El consumo de una dieta HP provocó acidosis metabólica (hipercalcemia e hipocitraturia urinarias, acidificación del pH urinario y niveles elevados de urea plasmática), (P Introduction: High protein (HP) diet consumption may adversely affect metabolic acidosis and hepatic and renal health. Despite such potentially adverse effect, there are only few studies analyzing the effects of resistance training on the parameters that could be altered by such diets. Material and methods: A total of 32 adult male Wistar rats were randomly distributed in 4 experimental groups (n = 8): normoprotein or HP diets, with or without resistance training. Diets were based on a whey protein hydrolyzate, and the experimental period lasted for 90 days. Results and discussion: Consumption of HP diets and resistance training significantly affected food intake, body composition and plasmatic levels of total cholesterol and triglycerides. Consumption of HP diets led to a considerable increase in liver and kidney weight (P < 0.001), urinary volume and acidity, as well as in the urinary excretion of Ca, with a parallel reduction in the urinary excretion of citrate (P < 0.05). The buffering action of resistance training on such diet-induced alterations was especially evident in the levels of hepatic and plasma triglycerides, plasmatic urea, and in liver and kidney weight (P < 0.001). Conclusion: Resistance training had a protective action against alterations of hepatic and renal health status and some metabolic parameters like hepatic and plasma triglycerides