Large-Nc QCD, Harmonic Sums and the Riemann Zeros

It is shown that in Large-Nc QCD, two--point functions of local operators become Harmonic Sums. We comment on the properties which follow from this fact. This has led us to an aside observation concerning the zeros of the Riemann zeta--function seen from the point of view of Dispersion Relations in Quantum Theory.Comment: Invited talk at the Montpellier QCD 2010 Conferenc

Thermodynamics of binary mixtures 1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane (HFE-7200) + 2-propanol: High pressure density, speed of sound and derivative properties

Awareness about environmental impact of greenhouse gas emissions has lead to search for other alternatives which can cover the same utility range of wellknown CFCs, HCFCs and PFCs but without their undesirable effects on the planet. Since Hydrofluoroether fluids (HFEs) have emerged as a good alternative, it is necessary to characterize their thermophysical properties in order to bring reliable data to the industry. Density and speed of sound are two of the most important physical properties because of the amount of information that they provide in the design of the machinery involved in the utilization of these fluids as well as data for the parametrization of equations of state. This paper reports a set of new data concerning high pressure density, ρ, for the binary mixture x HFE-7200 + (1 − x) 2-propanol in a broad range of pressures (0.1–140 MPa), and at several temperatures (from 293.15 to 393.15 K). Density values were correlated by employing a Tait-like equation in the same p, T ranges, and the derivative properties, that is, the isothermal compressibility κT, and the isobaric expansion αP, were determined. Excess molar volumes VE, which bring information about the change in volume observed in the mixture were also calculated for the eight mole fractions investigated. Speeds of sound, c, at 0.1 MPa were measured experimentally in the temperature range (293.15–333.15 K). By using the Laplace equation, isentropic compressibilities, κS, were calculated from density and sound velocity values

Alveolar fluid clearance in healthy pigs and influence of positive end-expiratory pressure

Journal Article;INTRODUCTION The objectives were to characterize alveolar fluid clearance (AFC) in pigs with normal lungs and to analyze the effect of immediate application of positive end-expiratory pressure (PEEP). METHODS Animals (n = 25) were mechanically ventilated and divided into four groups: small edema (SE) group, producing pulmonary edema (PE) by intratracheal instillation of 4 ml/kg of saline solution; small edema with PEEP (SE + PEEP) group, same as previous but applying PEEP of 10 cmH2O; large edema (LE) group, producing PE by instillation of 10 ml/kg of saline solution; and large edema with PEEP (LE + PEEP) group, same as LE group but applying PEEP of 10 cmH2O. AFC was estimated from differences in extravascular lung water values obtained by transpulmonary thermodilution method. RESULTS At one hour, AFC was 19.4% in SE group and 18.0% in LE group. In the SE + PEEP group, the AFC rate was higher at one hour than at subsequent time points and higher than in the SE group (45.4% vs. 19.4% at one hour, P < 0.05). The AFC rate was also significantly higher in the LE + PEEP than in the LE group at three hours and four hours. CONCLUSIONS In this pig model, the AFC rate is around 20% at one hour and around 50% at four hours, regardless of the amount of edema, and is increased by the application of PEEP.Ye

Autoeficacia académica y procrastinación académica en estudiantes de una universidad privada de Lima Metropolitana

El estudio tuvo como objetivo determinar la relación entre autoeficacia académica y procrastinación académica en estudiantes de una universidad privada de Lima Metropolitana. El diseño de investigación fue no experimental transversal correlacional. La muestra estuvo constituida por 419 universitarios de ambos sexos (mujeres = 72.3%; varones = 27.7%), entre los 17 a 20 años de edad. El muestreo fue no probabilístico intencional. Se emplearon el Cuestionario de Autoeficacia Académica General y la Escala de Procrastinación Académica. Los resultados indicaron que existe una relación débil (R = .369) y estadísticamente significativa (p = .000) entre las variables estudiadas; sin embargo, el coeficiente de determinación (R2 = .136) indicó que la variación de la autoeficacia académica es explicada por el 13.6% de la variación de la procrastinación académica (representada por sus dimensiones: postergación y autorregulación); es decir, existe un efecto pequeño. Se concluye que, aunque las correlaciones sean estadísticamente significativas, el efecto es débil. Se discuten las implicancias del estudio.The purpose of this research was to determine the relationship between academic selfefficacy and academic procrastination in students at a private university in Lima Metropolitana. The research design was non-experimental transversal correlational. The sample consisted of 419 university students of both sexes (women = 72.3%; men = 27.7%), between 17 and 20 years old. The sampling was intentional nonprobabilistic. The General Academic Self-Efficacy Questionnaire and the Academic Procrastination Scale were used. The results indicated that there is a weak (R = .369) and statistically significant (p = .000) relationship between the variables studied; however, the coefficient of determination (R2 = .136) indicated that the variation in academic self-efficacy is explained by 13.6% of the variation in academic procrastination (represented by its dimensions: procrastination and self-regulation); that is, there is a small effect. It is concluded that, although the correlations are statistically significant, the effect is weak. Study implications discussed

Los beneficios y riesgos percibidos por los consumidores al evaluar la compra y uso de medicina alternativa

En este estudio se dará a conocer el riesgo y beneficio percibido como variable dependiente, durante la evaluación y su posterior compra de la medicina alternativa, así como su uso. El objetivo de este trabajo es explicar cuáles son los riesgos y beneficios percibidos que más influyen en los consumidores al evaluar la compra y uso de la medicina alternativa. El estudio es relevante porque permite conocer y entender a profundidad el comportamiento del consumidor con respecto a la medicina alternativa y cuáles son los factores que los llevan a adquirir estos productos. El enfoque de esta investigación será un estudio cuantitativo explicativo que quiere entender la relación entre los beneficios, los riesgos y las creencias de los consumidores en relación con el uso y compra de medicina alternativa. Asimismo, el presente estudio será dirigido a hombres y mujeres entre 30 a 45 años de NSE A y B, que residen en Lima Metropolitana y que hayan comprado medicina alternativa o que estén dispuestos a utilizarla.In this study, the perceived risk and benefit will be revealed as a dependent variable, during the evaluation and subsequent purchase of alternative medicine, as well as its use. The objective of this work is to explain what are the perceived risks and benefits that most influence consumers when evaluating the purchase and use of alternative medicine. The study is relevant because it allows us to know and understand in depth the behavior of the consumer with respect to alternative medicine and what are the factors that lead them to acquire these products. The focus of this research will be an explanatory quantitative study that wants to understand the relationship between the benefits, risks and beliefs of consumers in relation to the use and purchase of alternative medicine. Likewise, this study will be aimed at men and women between 30 and 45 years of age from NSE A and B, who reside in Metropolitan Lima and who have bought alternative medicine or who are willing to use it.Trabajo de investigació

Intratracheal dopamine attenuates pulmonary edema and improves survival after ventilator-induced lung injury in rats

Journal Article; Research Support, Non-U.S. Gov't;INTRODUCTION Clearance of alveolar oedema depends on active transport of sodium across the alveolar-epithelial barrier. beta-Adrenergic agonists increase clearance of pulmonary oedema, but it has not been established whether beta-agonist stimulation achieves sufficient oedema clearance to improve survival in animals. The objective of this study was to determine whether the increased pulmonary oedema clearance produced by intratracheal dopamine improves the survival of rats after mechanical ventilation with high tidal volume (HVT). METHODS This was a randomized, controlled, experimental study. One hundred and thirty-two Wistar-Kyoto rats, weighing 250 to 300 g, were anaesthetized and cannulated via endotracheal tube. Pulmonary oedema was induced by endotracheal instillation of saline solution and mechanical ventilation with HVT. Two types of experiment were carried out. The first was an analysis of pulmonary oedema conducted in six groups of 10 rats ventilated with low (8 ml/kg) or high (25 ml/kg) tidal volume for 30 or 60 minutes with or without intratracheally instilled dopamine. At the end of the experiment the animals were exsanguinated and pulmonary oedema analysis performed. The second experiment was a survival analysis, which was conducted in two groups of 36 animals ventilated with HVT for 60 minutes with or without intratracheal dopamine; survival of the animals was monitored for up to 7 days after extubation. RESULTS In animals ventilated at HVT with or without intratracheal dopamine, oxygen saturation deteriorated over time and was significantly higher at 30 minutes than at 60 minutes. After 60 minutes, a lower wet weight/dry weight ratio was observed in rats ventilated with HVT and instilled with dopamine than in rats ventilated with HVT without dopamine (3.9 +/- 0.27 versus 4.9 +/- 0.29; P = 0.014). Survival was significantly (P = 0.013) higher in animals receiving intratracheal dopamine and ventilated with HVT, especially at 15 minutes after extubation, when 11 of the 36 animals in the HVT group had died as compared with only one out of the 36 animals in the HVT plus dopamine group. CONCLUSION Intratracheal dopamine instillation increased pulmonary oedema clearance in rats ventilated with HVT, and this greater clearance was associated with improved survival.This work was supported in part by RED GIRA (G03/063) and FIBAO Research Foundation.Ye

Spine gunShot woundS at the Central Military hoSpital in MexiCo

Feridas por projétil de arma de Fogo na coluna vertebral no ABSTRACT Objective: To compare the measurement of the Cobb angle in printed radiographs and digitalized radiographs displayed with the &quot;PixViewer&quot; tool. Methods: Pre-operative radiographs of 23 patients were performed in printed films and using the software &quot;PixViewer&quot;. The same evaluator, a spine surgeon, chose the proximal and distal end vertebrae at the limit of the main curve in printed radiographs without identifying patients, and measured the Cobb angle based on these parameters. The same parameters and measurements were performed in digitalized radiographs. The measurements were compared, as well as the choice of end vertebrae. Results: The average change in the Cobb angle between the methods was 1.48±1.73°. The intraclass correlation coefficient (ICC) was 0.99, demonstrating excellent reproducibility. Conclusion: The Cobb method can be used to evaluate scoliosis through the &quot;PixViewer&quot; tool with the same reliability of the classic method on printed radiographs

High pressure density and speed of sound of hydrofluoroether fluid 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)-pentane (HFE-7300)

High pressure density measurements were carried out for the hydrofluoroether fluid HFE-7300. A total of 159 points have been measured in the pressure range from 0.1 to 140 MPa and along seven isotherms within the temperature interval (293.15–393.15) K. To perform these measurements, an Anton Paar vibrating tube densitometer was used. The experimental high pressure density data were correlated to a Tait-like equation and compared with the available literature. By deriving the Tait-like equation, the isothermal compressibility and isothermal compressibility were also determined in the same P and T ranges. The speed of sound measurements were performed along six isotherms from 293.15 to 333.15 K at 0.1 MPa. The isentropic compressibilities were also calculated from speed of sound and density data by means of the Laplace equatio

Assessment of major depressive disorder model in rat

El trastorno depresivo mayor (MDD) es una enfermedad caracterizada por la presencia de dos o más episodios depresivos consecutivos, es un factor de riesgo para cometer suicidio. La mayoría de las terapias antidepresivas se basan en el mantenimiento de la serotonina (5-HT) en la hendidura sináptica. El modelo debulbectomía olfatoria bilateral (OBX) tiene características similares al trastorno depresivo humano. El objetivo de este trabajo es caracterizar a la bulbectomía olfatoria como un modelo de depresión en ratas. Los resultados obtenidos muestran cambios fisiológicos y conductuales que son comparables a la depresión humana, las ratas bulbectomizadas disminuyeron de peso comparadas con los grupos control y cirugía sin extracción, la presencia de la hiperactividad es reducida después de 21 días de tratamiento con antidepresivos, la respuesta alterada a los estímulos adversos y la disminución del acicalamiento puede ser comparado con síntomas de depresión en humanos.Major depressive disorder (MDD) is a disease characterized by the presence of two or more depressive episodes. It is a risk factor to commit suicide. The most common antidepressant therapies are based on maintaining serotonin (5-HT) in the synaptic cleft. The bilateral olfactory bulbectomy (OBX) in rat model have characteristics similar to human depressive disorder. The aim of this work is to characterize olfactory bulbectomy as a depressive major model in rats. These results show physiological and behavioral changes that are comparable to human depression; bulbectomized rats have decreased weight compared to control and surgery without extraction groups, the presence of hyperactivity is reduced after 21 days of treatment with antidepressants (SSRI), altered response to adverse stimuli and a decrease of grooming can be equated a symptom of depression in humans

Excess Enthalpies of Binary and Ternary Mixtures Containing Dibutyl Ether, Cyclohexane, and 1-Butanol at 298.15 K

Experimental excess enthalpies of the ternary system dibutyl ether (DBE) + cyclohexane + 1-butanol and the corresponding binary systems at 298.15 K are reported. A quasi-isothermal flow calorimeter has been built and tested to make the measurements. All the binary and the ternary systems show endothermic character. The experimental data have been fitted using a polynomial equation for the binary and ternary systems. The values of the standard deviation indicate good agreement between the experimental results and those calculated from the equation.Ministerio de Educación y Ciencia, Spain, Projects ENE2006- 12620 and ENE2006-13349, and from the Consejería de Educación, Junta de Castilla y León, Spain, Project BU015A0