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Search Results: 1 - 10 of 219814 matches for " C. Carrera "
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Walsh, Carl. Monetary Theory and Policy. Tercera edición. Cambridge: The MIT Press. 640 pp.
César Carrera
Revista Economía , 2011,
Abstract:
Efecto protector de la toxina botulínica en colgajos cutáneos
Astudillo Carrera,C.X.;
Cirugía Plástica Ibero-Latinoamericana , 2011, DOI: 10.4321/S0376-78922011000200014
Abstract: random-pattern cutaneous flaps are very useful in reconstructive surgery; an adequate vascular contribution is an important factor for the survival of the flaps. we designed an experimental study elevating a total of 36 dorsal flaps, divided in 4 groups: a) 9 were controls, to which 0.9% physiological solution was applied, b) 9 with a transoperatory application of type a botulinum toxin throughout the length of the flap, c) 9 with an application of type a botulinum toxin 7 days before surgery and d), 9 with type a botulinum toxin with epinephrine applied transsurgery in all the flap. the skin flaps were analyzed 7 days after surgery with image j program and the t student test. we take a medium of the necrotic area: a) for the controls of 72.17 ± 3.9%, b) botulinum toxin transsurgery 5.09 ± 1.2% p = 0.032, c) botulinum toxin applied 7 days before 24.97 ± 2.7% p = 0.041 and d) botulinum toxin with epinephrine 23.90 ± 3.9% p = 0.045. we conclude that botulinum toxin acts as a protector against the suffering process - ischemia of the tissues, thanks to its vasodilator action and that it should be applied in the beginning of the surgical procedure.
Efecto protector de la toxina botulínica en colgajos cutáneos The protective effect of botulinum toxin on skin flaps
C.X. Astudillo Carrera
Cirugía Plástica Ibero-Latinoamericana , 2011,
Abstract: Los colgajos cutáneos de patrón vascular randomizado son de gran utilidad en Cirugía Reconstructiva; un aporte vascular adecuado es el factor más importante para la supervivencia de los mismos. Realizamos un estudio experimental levantando un total de 36 colgajos en el dorso de 9 conejos (4 en cada conejo): a) 9 controles, b) 9 con aplicación de toxina botulínica tipo A transoperatoria a lo largo del colgajo, c) 9 con toxina botulínica tipo A aplicada 7 días antes del procedimiento quirúrgico, y, d) 9 con aplicación de toxina botulínica tipo A transoperatoria más epinefrina. El análisis de los colgajos se realizó a través de imágenes digitales que se examinaron con el programa ImageJ. Efectuamos el análisis estadístico con la prueba T de Student. La evaluación final de los colgajos se realizó al séptimo día, tiempo en el cual se obtuvo: a) una media de área necrótica en los controles del 72.17 ± 3.9% ; b) en los que se aplicó toxina botulínica transoperatoria el porcentaje de aérea necrótica fue del 5.09 ± 1.2% p = 0.032; c) en aquellos en los que la toxina botulínica se aplicó 7 días antes del procedimiento se reportó necrosis del 24.97 ± 2.7% p = 0.041 y d) en los que se aplicó toxina botulínica transoperatoria más epinefrina el porcentaje de necrosis fue del 23.90 ± 3.9% p = 0.045. Concluimos que la toxina botulínica tipo A actúa como protector contra el proceso de sufrimiento-isquemia de los tejidos, debido a su acción vasodilatadora, recomendando su aplicación al inicio del procedimiento quirúrgico. Random-pattern cutaneous flaps are very useful in Reconstructive Surgery; an adequate vascular contribution is an important factor for the survival of the flaps. We designed an experimental study elevating a total of 36 dorsal flaps, divided in 4 groups: a) 9 were controls, to which 0.9% physiological solution was applied, b) 9 with a transoperatory application of type A botulinum toxin throughout the length of the flap, c) 9 with an application of type A botulinum toxin 7 days before surgery and d), 9 with type A botulinum toxin with epinephrine applied transsurgery in all the flap. The skin flaps were analyzed 7 days after surgery with Image J program and the T Student test. We take a medium of the necrotic area: a) for the controls of 72.17 ± 3.9%, b) botulinum toxin transsurgery 5.09 ± 1.2% p = 0.032, c) botulinum toxin applied 7 days before 24.97 ± 2.7% p = 0.041 and d) botulinum toxin with epinephrine 23.90 ± 3.9% p = 0.045. We conclude that botulinum toxin acts as a protector against the suffering process - ischemia of the tissues, thanks to its
Searching for chemical inhomogeneities in Open Clusters: Analysis of the CN and CH Molecular Band Strengths in NGC 2158, NGC 2420, NGC 2682, NGC 7789 and Berkeley 29
R. Carrera,C. E. Martinez-Vazquez
Physics , 2013, DOI: 10.1051/0004-6361/201322048
Abstract: Context: The total mass of a cluster, being the main parameter determining its ability to host more than one stellar generation, may constitute a threshold below which the cluster is able to form only a single stellar population. AIms: Our goal is to investigate the existence of star-to-star variations of CN and CH band strengths, related to the N and C abundances, respectively, among the stars in five open cluster (NGC 2158, NGC 2420, NGC 2682, NGC 7789 and Berkeley 29) similar to those observed in globular clusters and linked with the existence of multiple populations therein. Since these systems are less massive than globulars, our results may allow us to constrain the lower mass necessary to form more than one stellar population. Methods: We measured the strength of the CN and CH bands, which correlate with the C and N abundances, using four molecular indices in low-resolution SDSS/SEGUE spectra. Results: We found that for four of the open clusters (NGC 2158, NGC 2420, NGC 2682 and Berkeley 29) all the stars studied in each of them have similar CN and CH band strengths within the uncertainties since neither anomalous spreads nor bimodalities have been detected in their CN and CH distributions. In contrast, for NGC 7789 we found an anomalous spread in the strength of the CN molecular band at 3839 \AA which is larger than the uncertainties. However, the small number of stars studied in this cluster implies that further analysis is needed to confirm the existence of chemical inhomogeneities in this cluster.
Detección de incrementos de Dimensión Vertical Oclusal mediante análisis cefalométrico de Ricketts
Carrera Vidal,C; Larrucea Verdugo,C; Galaz Valdés,C;
Revista clínica de periodoncia, implantología y rehabilitación oral , 2010, DOI: 10.4067/S0719-01072010000200004
Abstract: introduction: oral rehabilitation of patients with severe wear, becomes complex when there is a need to increase vertical dimension. evaluation methods of vertical dimension do not deliver accurate information to define as increase is necessary. the cephalometric analysis appears as an additional option to the clinical tools, specific ricketts analysis containing vertical measurements of the lower third, through the lower facial height angle, whose normal value is 47o, but with a high-standard deviation. objective: to determine whether the lower height ricketts angle is sensitive to increases in oclusal vertical dimension (ovd). method: nine subjects aged 20 to 30 years-old underwent cephalometric analysis in order to measure the lower height ricketts angle in centric occlusion position, then increasing ovd in 1, 3 and 5 mm. results: lower height ricketts angle showed an increase as ovd of 1, 3 and 5 mm augmented in all subjects. nonparametric friedman′s statistical analysis was applied, being the results statistically significant (p=0.000). according to post hoc test of siegel and castellon, lower height ricketts angle variation of 1 mm is not statistically significant. conclusions: it may be suggested that the ricketts cephalometric analysis by measuring the lower height angle is able to detect increases in the ovd, but the change that occurs within 1 mm increase is not statistically significant.
Detección de incrementos de Dimensión Vertical Oclusal mediante análisis cefalométrico de Ricketts Detection of increases of Vertical Occlusal Dimension by Ricketts cephalometric analysis
C Carrera Vidal,C Larrucea Verdugo,C Galaz Valdés
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral , 2010,
Abstract: Introducción: La rehabilitación de pacientes con desgastes severos es compleja cuando se determina un aumento de Dimensión Vertical. Los métodos de evaluación de Dimensión Vertical no entregan una información precisa para definir cuánto incremento es necesario. El análisis cefalométrico aparece como una opción adicional a las herramientas clínicas, específicamente el análisis de Ricketts contiene mediciones verticales del tercio inferior, a través del ángulo Altura Facial Inferior, cuyo valor normal es de 47o, pero con una desviación estándar alta. Objetivo: Determinar si el ángulo Altura Inferior de Ricketts es sensible a incrementos de Dimensión Vertical Oclusal (DVO). Método: A nueve sujetos entre 20 y 30 a os se les realizó un análisis cefalométrico con el fin de medir el ángulo Altura Inferior de Ricketts, en posición MIC, y luego con incrementos de la Dimensión Vertical de 1, 3 y 5 mm. Resultados: Los resultados mostraron que el valor del ángulo Altura Inferior de Ricketts (AFI) aumentó con los incrementos de la Dimensión Vertical Oclusal de 1, 3 y 5 mm en todos los sujetos. Al análisis estadístico no paramétrico de Friedman, estos resultados son significativos (p=0.000). A la prueba Post Hoc de Siegel y Castellon la variación del ángulo Altura Inferior de Ricketts con el incremento de 1 mm de DVO no es significativa. Conclusiones: Se puede sugerir que el análisis cefalométrico de Ricketts, a través de la medición del ángulo AFI, es capaz de detectar incrementos en la DVO, pero la variación que se produce con 1 mm de incremento no es estadísticamente significativa. Introduction: Oral rehabilitation of patients with severe wear, becomes complex when there is a need to increase Vertical Dimension. Evaluation methods of Vertical Dimension do not deliver accurate information to define as increase is necessary. The cephalometric analysis appears as an additional option to the clinical tools, specific Ricketts analysis containing vertical measurements of the lower third, through the Lower Facial Height angle, whose normal value is 47o, but with a high-standard deviation. Objective: To determine whether the Lower Height Ricketts angle is sensitive to increases in Oclusal Vertical Dimension (OVD). Method: Nine subjects aged 20 to 30 years-old underwent cephalometric analysis in order to measure the Lower Height Ricketts angle in centric occlusion position, then increasing OVD in 1, 3 and 5 mm. Results: Lower Height Ricketts angle showed an increase as OVD of 1, 3 and 5 mm augmented in all subjects. Nonparametric Friedman′s statistical analysis was applied
El agua subterránea como agente transmisor de protozoos intestinales Subterraneons water as agent of intestinal protozoa trasmission
María C. Lura,Daniel Beltramino,Beatriz Abramovich,Elena Carrera
Revista chilena de pediatría , 2002,
Abstract: Objetivo: El objetivo del presente trabajo fue establecer si había asociación entre el consumo de agua obtenida de fuentes subterráneas, sólo desinfectada con cloro, y la presencia de protozoos intestinales en una población pediátrica. Población. Se estudiaron cuatro grupos de ni os, de cuatro meses a doce a os de edad, que compartían similares condiciones socioeconómicas y sanitarias. Los grupos A (n = 34), B (n = 36) y C (n = 45), consumían agua de red proveniente de fuentes subterráneas, sólo tratada con cloro antes de ser distribuida. El grupo control, D (n = 34), consumía agua de fuente superficial con tratamiento de potabilización convencional completo. Material y métodos. En cada grupo se analizó el agua, desde el punto de vista fisicoquímico, bacteriológico y parasitológico y se realizaron cultivos coproparasitológicos seriados a los ni os seleccionados. Se realizó, además, una encuesta a los padres. Resultados: Se comprobó contaminación bacteriológica y parasitológica en algunas de las perforaciones que abastecían a los grupos de población A, B y C. Se detectaron quistes u ooquistes de protozoos en los tanques B y C. Los porcentajes de estudios copropa-rasitológicos positivos en los ni os residentes en cada grupo fueron: A, 47%; B, 41%; C, 67% y D, 12%. Se obtuvieron diferencias significativas entre A y D (p = 0,0039; OR 5,16 [1,43-19,65]), B y D (p = 0,012; OR 4,14 [1,16-15,62]) y entre C y D (p < 10-5; OR 11,60 [3,35-42,88]). Según los resultados de la encuesta, los cuatro grupos compartían condiciones socio-económico-sanitarias similares. Conclusiones: En las muestras estudiadas, las diferencias relativas existentes entre el grupo control y el resto de los grupos estudiados permitirían inferir que existe un alto riesgo de infección con protozoos intestinales cuando se consume agua contaminada de origen subterráneo que sólo fue clorada antes de su distribución.
New material as support for nickel boride catalyst
D. Acosta,J. Martinez,C. Carrera,E. Erdmann
Latin American applied research , 2006,
Abstract: The main objective of this work is to study the feasibility of new materials to be used as support for boron-nickel catalysts. Potential support materials such as: silica gel, alumina, hydrothermal modified Perlites and zeolite 4A, were characterized by BET, TPR and DRX. After the addition of Ni and B, their catalytic activity evaluated with the nitrobenzene hydrogenation model reaction. The influence of operational parameters during the impregnation process such as order of reactants, speed of agitation, time of aging and it influences from the previous thermal treatment were evaluated. The results show that the adequate materials to be used as catalysts supports are the commercial silica and Rehydroxilated Perlite. It is due to the existence of superficial OH groups, which allow the anchorage of the nickel boride catalyst.
Ulceración y estenosis del duodeno como forma de presentación de enfermedad celiaca Celiac disease presented as duodenal ulcer and stenosis
A. Castiella,I. Aramberri,J. Fernández,C. Carrera
Revista Espa?ola de Enfermedades Digestivas , 2007,
Abstract:
DIFFERENCES IN THE ECONOMIC GROWTH OF LATIN AMERICAN COUNTRIES. INTEGRATION EFFECTS AND FOREIGN DIRECT INVESTMENT INFLUENCE.
Marta Bengoa, Ana M. Carrera ; Adolfo C. Fernández
Revista Investigación Operacional , 2008,
Abstract: This paper tries to explain the wide range of economic experiences among Latin American countries taking into account the role of capital formation and foreign direct investment (FDI) as a drive engine of growth. We design a model in which FDI generates endogenous, non zero growth. In particular, FDI brings about growth because it facilitates the entry of intermediate goods of more advanced technology in the host country. In contrast, if the entrance of FDI is obstructed or precluded by policy measures in the host country, the growth rate of the latter will be smaller or even zero. Integration enables countries to exchange more varieties of goods and eases technological diffusion through FDI. The predictions are tested empirically using GMM technique in a panel data performed by 18 Latin American countries over the period 1970-2000. The estimations suggest that Latin America’s growth rates are positively related to a more open attitude and to a greater integration in international markets. However, the empirical analysis also points out to the need of a certain degree of social capacity to ensure a successful integration. Finally, the empirical exercise confirms the positive connection between FDI and growth predicted by the model.
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