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Search Results: 1 - 10 of 464573 matches for " Rogger álvaro Bendezú-García "
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Loculated hydrothorax: An unusual complication of hepatic cirrhosis Hidrotórax loculado: una complicación inusual de la cirrosis hepática
Rogger álvaro Bendezú-García,Marta Lázaro-Sáez,álvaro Hernández-Martínez,Gustavo Oliver Patrón-Román
Revista Espa?ola de Enfermedades Digestivas , 2013,
Abstract:
CHROMIUM ADSORPTION FROM TANNERY EFFLUENTS BY ACTIVATED CARBONS PREPARED FROM COCONUT SHELLS BY CHEMICAL ACTIVATION WITH KOH AND ZNCL2 ADSORCIóN DE CROMO DESDE EFLUENTES DE CURTIEMBRES POR CARBONES ACTIVADOS PREPARADOS DESDE CáSCARAS DE COCO POR ACTIVACIóN QUíMICA CON KOH Y ZNCL2
S. BENDEZú,J. OYAGUE,A. ROMERO,R. GARCíA
Journal of the Chilean Chemical Society , 2005,
Abstract: Activated carbons of high adsorbents properties for adsorption of chromium species from aqueous solution and Tannery effluents were prepared from coconut shells by means of chemical activation using as activating agents the KOH and ZnCL2, in atmosphere of N2(g) and CO2(g), respectively. It was found that the adsorption capacity of the produced activated carbons are significantly higher than that of the commercial one that was tested. Based on the results obtained from a variety of characterization methods, it has been determined the presence of functional organic groups, phenols and carbonyls, which are responsible for the activated carbons surface charge and it favored the chromium species adsorption, zeta potential measurements helped to explain the metal adsorption in terms of electrostatic attraction-repulsion behavior of the activated carbon surface and cations of Cr(III) and oxyanions of Cr(VI), respectively. It was observed that the activated carbons CK12 and CZ32 displayed the biggest adsorbents properties, it was adsorbed approximately 721.38 mg of chromium with the CK12, 534.43 mg with the CZ32, and only 274.02 mg with the commercial carbon (CC), by gram of activated carbon, respectively, at pH 4.45 from Tannery effluents Se prepararon carbones activados de elevadas propiedades adsorbentes desde cáscaras de coco mediante activación química usando como agentes activantes el KOH y ZnCL2, en atmósfera de N2(g) y CO2(g), respectivamente, para adsorber especies de cromo desde soluciones acuosas y efluentes de Curtiembres. Se halló que la capacidad de adsorción de los carbones activados obtenidos es significativamente mayor que el carbón comercial usado. En base a resultados obtenidos de los diversos métodos de caracterización, se determinó la presencia de grupos funcionales orgánicos, fenoles y carbonilos, responsables de la carga superficial de los carbones activados que favoreció la adsorción de las especies de cromo, medidas de potencial zeta ayudaron a explicar la adsorción del metal en términos de la acción electrostática atracción-repulsión de la superficie del carbón activado y los cationes Cr(III) y oxianiones Cr(VI), respectivamente. Se observó que los carbones activados CK12 y CZ32 muestran las propiedades adsorbentes más altas, se adsorbió aproximadamente 721,38 mg de cromo con el CK12, 534,43 mg con el CZ32 y solamente 274,02 mg con el carbón comercial (CC), por gramo de carbón activado, respectivamente, a pH 4,45 desde los efluentes de Curtiembres
CHROMIUM ADSORPTION FROM TANNERY EFFLUENTS BY ACTIVATED CARBONS PREPARED FROM COCONUT SHELLS BY CHEMICAL ACTIVATION WITH KOH AND ZNCL2
BENDEZú,S.; OYAGUE,J.; ROMERO,A.; GARCíA,R.; MU?OZ,Y.; ESCALON,N.;
Journal of the Chilean Chemical Society , 2005, DOI: 10.4067/S0717-97072005000400007
Abstract: activated carbons of high adsorbents properties for adsorption of chromium species from aqueous solution and tannery effluents were prepared from coconut shells by means of chemical activation using as activating agents the koh and zncl2, in atmosphere of n2(g) and co2(g), respectively. it was found that the adsorption capacity of the produced activated carbons are significantly higher than that of the commercial one that was tested. based on the results obtained from a variety of characterization methods, it has been determined the presence of functional organic groups, phenols and carbonyls, which are responsible for the activated carbons surface charge and it favored the chromium species adsorption, zeta potential measurements helped to explain the metal adsorption in terms of electrostatic attraction-repulsion behavior of the activated carbon surface and cations of cr(iii) and oxyanions of cr(vi), respectively. it was observed that the activated carbons ck12 and cz32 displayed the biggest adsorbents properties, it was adsorbed approximately 721.38 mg of chromium with the ck12, 534.43 mg with the cz32, and only 274.02 mg with the commercial carbon (cc), by gram of activated carbon, respectively, at ph 4.45 from tannery effluents
Validación de la prueba de dibujo del reloj - versión de Manos - como prueba de cribado para detectar demencia en una población adulta mayor de Lima, Perú
Custodio,Nilton; García,Alberto; Montesinos,Rosa; Lira,David; Bendezú,Liliana;
Revista Peruana de Medicina Experimental y Salud Pública , 2011, DOI: 10.1590/S1726-46342011000100005
Abstract: introduction. the clock drawing test (pdr-m) - manos′ version - is a brief cognitive assessment tool for dementia detection. objectives. to assess the validity and reliability of the pdr-m to discriminate between patients with dementia and healthy control subjects. materials and methods. we evaluated subjects over 65 years of age, excluding those with severe concomitant diseases and those with hearing or visual impairment. we obtained demographic data and performed the pdr-m and mini mental state examination (mmse). subjects of the dementia group were also submitted to clinical, laboratory and neuropsychological evaluations as well as computed tomography scanning. sensitivity and specificity of the pdr-m were calculated as well as the area under the roc curve. results. we evaluated 210 individuals, 103 with confirmed diagnosis of dementia and 107 healthy controls with similar age and sex in both groups, but a higher educational level in the control group. setting a cutoff point of 7, a sensitivity of 99.0% and a specificity of 83.5% were found. when comparing the areas under the roc curves of the pdr-m and mmse we found no statistically significant difference. conclusions. the pdr-m is a brief and reliable instrument for the detection of dementia in the urban population of lima, peru.
Una crónica inacabada
álvaro García Meseguer
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2001,
Abstract:
Masculino genérico
álvaro García Meseguer
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2004,
Abstract:
Sexismo y ultrasexismo lingüísticos
álvaro García Meseguer
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2004,
Abstract:
Masculino específico
álvaro García Meseguer
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2003,
Abstract:
De pianistas, hombres y mujeres
álvaro García Meseguer
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2003,
Abstract:
Es sexista la lengua espa ola?
álvaro García Meseguer
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2001,
Abstract:
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