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Search Results: 1 - 10 of 41762 matches for " Campos-Fernández "
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Development and Validation of a Voltammetry Method to Determine Traces of Iron in Water and other Matrixes
Alvarado-Gámez,Ana L.; Campos-Fernández,Jorge;
Portugaliae Electrochimica Acta , 2005,
Abstract: it was developed a sensitive analytical methodology to determine iron in water samples and other matrixes. it was used a differential pulse cathodic stripping voltammetry technique and adsorptive preconcentration with kscn as a ligand and nano2 as a catalytic agent. the methodology has a linear range between 0.7 mg/l and 10.0 mg/l, a detection limit of 0.2 mg/l and a quantification limit of 0.7 mg/l. the averaged sensitivity is 344 na/(mg/l). the accuracy has a recovery of 102% for 1.0 mg/l of iron with a variation coefficient of 4%. also it was studied the linearity of the fe-cathecol system, which has an average sensitivity of 4 na/(mg/l), much lower than the one of the fe-kscn system, and a wider linear range from 2.4 mg/l to 50.0 mg/, a detection limit of 0.7 mg/l and quantification limit of 2.4 mg/l, with a variation coefficient of 8% and recoveries near 100% at different concentration levels.
Desarrollo y Validación de un Método Voltamperométrico para Determinar Trazas de Hierro en aguas y otras Matrices Development and Validation of a Voltammetry Method to Determine Traces of Iron in Water and other Matrixes
Ana L. Alvarado-Gámez,Jorge Campos-Fernández
Portugaliae Electrochimica Acta , 2005,
Abstract: Se desarrolló una metodología analítica sensible para determinar hierro en muestras de agua y otras matrices. Se utilizó la técnica voltamperométrica de redisolución catódica con pulso diferencial y preconcentración adsortiva utilizando KSCN como ligando y NaNO2 como agente catalítico. El método tiene un ámbito lineal entre 0.7 μg/L y 10.0 μg/L, con un límite de detección de 0.2 μg/L y de cuantificación de 0.7 μg/L. La sensibilidad promedio es de 344 nA/(μg/L). La veracidad como 102% de recuperación para 1.0 μg/L con un coeficiente de variación de 4%. También se estudió la linealidad del sistema Fe-catecol, el cual tiene sensibilidad promedio de 4 nA/(μg/L) menor que el sistema Fe-KSCN y un ámbito lineal mayor, desde 2.4 μg/L hasta 50.0 μg/L, un límite de detección de 0.7 μg/L y de cuantificación de 2.4 μg/L con un coeficiente de variación de 8% y recuperaciones cercanas al 100% a varios niveles de concentración. It was developed a sensitive analytical methodology to determine iron in water samples and other matrixes. It was used a differential pulse cathodic stripping voltammetry technique and adsorptive preconcentration with KSCN as a ligand and NaNO2 as a catalytic agent. The methodology has a linear range between 0.7 mg/L and 10.0 mg/L, a detection limit of 0.2 mg/L and a quantification limit of 0.7 mg/L. The averaged sensitivity is 344 nA/(mg/L). The accuracy has a recovery of 102% for 1.0 mg/L of iron with a variation coefficient of 4%. Also it was studied the linearity of the Fe-cathecol system, which has an average sensitivity of 4 nA/(mg/L), much lower than the one of the Fe-KSCN system, and a wider linear range from 2.4 mg/L to 50.0 mg/, a detection limit of 0.7 mg/L and quantification limit of 2.4 mg/L, with a variation coefficient of 8% and recoveries near 100% at different concentration levels.
Incidence and risk factors for cutaneous adverse drug reactions in an intensive care unit
Campos-Fernández, Maria del Mar;Ponce-de-León-Rosales, Samuel;Archer-Dubon, Carla;Orozco-Topete, Rocío;
Revista de investigación clínica , 2005,
Abstract: objective. to evaluate the incidence of adverse cutaneous drug reactions in intensive care unit patients. design. cohort study. setting. general adult intensive care unit of an institutional tertiary care hospital. patients. patients in the intensive care unit during a consecutive 8-month period were examined for adverse cutaneous drug reactions. results. patients in the intensive care unit have an incidence of 11.6% of adverse cutaneous drug reactions. associated risk factors were female gender, obesity, age over 60 and immune dysregulation (systemic lupus erythematosus, dysthyroidism, and antiphospholipid antibodies syndrome). few patients had previous history of adverse cutaneous drug reactions. antimicrobials were the main drug involved. morbilliform rash followed by urticary were the most frequently observed reactions. interestingly, over 50% of patients with massive edema -independent of etiology- died. conclusions. intensive care unit patients are particularly at risk for developing an adverse cutaneous drug reaction.
Association of free fatty acids with the insulin-resistant state but not with central obesity in individuals from Venezuela Asociación de los ácidos grasos libres con el estado de insulino-resistencia pero no con obesidad central en individuos venezolanos
Gilberto Campos,Virginia Fernández,Erika Fernández,Emperatriz Molero
Investigación Clínica , 2010,
Abstract: Individuals with insulin resistance (IR) usually have upper body obesity phenotype, often accompanied by an increase in plasma free fatty acids (FFA). Since the Venezuelan population has a high frequency of IR and central obesity, the purpose of this work was to determine FFA levels in 47 Venezuelan individuals, men and women, 24-58 years old, and analyze their relationship with central obesity and parameters of carbohydrate and lipid metabolism. Basal concentrations of TG, total cholesterol, LDL-C, and HDL-C were measured, and FFA, glucose and insulin, at basal state and at different times after a glucose load. Eighteen individuals presented insulin resistance (HOMA-IR >2.7) and 29 were non-insulin resistant (non-IR). Insulin resistant individuals (IR) had higher waist circumference, BMI and basal concentrations of FFA than the non-IR. No differences were observed in skin folds and other basal lipids studied. The increased FFA seemed to be related to the IR associated to BMI and not to central obesity, since the difference between IR and non-IR disappeared when they were matched for waist circumference. After a glucose load, FFA decreased in both groups, but remained significantly elevated in IR subjects. This effect disappeared after matching for BMI or waist circumference, inferring that it was independent of anthropometrics. FFA were positively associated with HOMA-IR, glucose and TG levels; however, there was no association with BMI or waist circumference. These findings, and the lack of elements to support the presence of hepatic IR, common to increased visceral lipolysis, might suggest that the IR present in the obese individuals studied, might be due to an increase in subcutaneous fat. Los individuos con insulino-resistencia (IR) usualmente presentan obesidad central, fenotipo comúnmente acompa ado de incremento de ácidos grasos libres (AGL). Como los individuos venezolanos presentan una alta frecuencia de IR y obesidad central, el objetivo de este trabajo fue analizar, en un grupo de ellos, la relación entre AGL y obesidad central y parámetros relacionados con el metabolismo de carbohidratos y lípidos. En 47 venezolanos, hombres y mujeres, entre 24 y 58 a os, se determinaron las concentraciones basales de TG, Colesterol total, LDL-C, HDL-C y AGL, glucemia e insulina a nivel basal y a diferentes tiempos después de una sobrecarga glucosada. Dieciocho individuos resultaron IR (HOMA-IR > 2,7) y 29 no IR. Los IR presentaron mayor circunferencia de cintura (CC), índice de masa corporal (IMC) y concentraciones basales de AGL. No hubo diferencias en lo
Exequias en honor de Felipe III celebradas en Lima en 1621
Campos y Fernández de Sevilla, Javier
Hispania Sacra : Revista de Historia Eclesiástica , 2001,
Abstract: The author demonstrates in this article that the cultural relationships between Spain and the colonies of Spanish-America were very narrow in spite of the distance. The author takes as example the funerals of Philip in, which were celebrated in Lima with the same form and pomp with which were celebrated in Spain. El autor demuestra en este trabajo que las relaciones culturales entre Espa a y sus colonias de Hispanoamérica fueron muy estrechas a pesar de la lejanía. Toma como ejemplo los funerales de Felipe in celebrados en Lima con la misma forma y boato con que se hicieron en Espa a.
Análisis estadístico de materiales líticos paleolíticos: la Cueva de la Cantera (Alcedo, León)
Neira Campos, Ana,Mallo Fernández, F.
Trabajos de Prehistoria , 1990,
Abstract: In this paper we study three groups of lithic materials from the site of Cueva de la Cantera (Alcedo, León), which have been assigned for many years to three stages of the Upper Palaeolithic: Aurignacian, Magdalenian and Azilian. The statistical analyses of Homogeneity, Correspondence and Distance applied to technological data of the butts and the blanks seems to demonstrate that this triple classification does not hold. As an alternative, we propose the allocation of the materials to a single group corresponding to the Final Upper Palaeolithic. En este artículo estudiamos tres grupos de materiales líticos procedentes del yacimiento de la Cueva de la Cantera (Alcedo, León) que han sido adscritos, durante muchos a os, a tres etapas del Paleolítico Superior: Auri aciense, Magdaleniense y Aziliense. Los análisis estadísticos de Homogeneidad, Correspondencias y Distancia, aplicados a los datos tecnológicos de los talones y soportes de los tres grupos, parecen demostrar que esta triple clasificación no se mantiene. Ofrecemos como alternativa la asignación de las piezas a un único grupo correspondiente al Paleolítico Superior Final.
Metamorfosis de la lectura
Mar Campos Fernández-Fígares
álabe , 2010,
Abstract:
Entrevista con ángel Sánchez Harguindey
Mar Campos Fernández-Fígares
álabe , 2010,
Abstract:
Nuevas formas de leer. Diccionario de conceptos clave de lectura y escritura
Mar Campos Fernández-Fígares
álabe , 2012,
Abstract:
La crítica en la plaza pública. Siglos XVIII-XX (peque as dudas históricas sobre educación y literatura)
Campos Fernández-Fígares, M.
Ocnos , 2010,
Abstract: Cuando nos acercamos a la educación literarianecesitamos cubrir un hueco histórico acerca delnacimiento de la Crítica y su función facilitadora ydivulgadora. Y al igual que hoy hablamos de una sociedadglobalizada, no podemos pensar en esa funciónde la crítica en Espa a sin analizar también suaparición en otros países, principalmente Inglaterray Francia. Desde su nacimiento en el nuevo espaciode la Plaza Pública del XVIII hasta su difuminaciónen el “Mercado sin más”, será un agente fundamentalen la educación en general y en la educaciónliteraria en particular.
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