Neutrino-driven electrostatic instabilities in a magnetized plasma

The destabilizing role of neutrino beams on the Trivelpiece-Gould modes is considered, assuming electrostatic perturbations in a magnetized plasma composed by electrons in a neutralizing ionic background, coupled to a neutrino species by means of an effective neutrino force arising from the electro-weak interaction. The magnetic field is found to significantly improve the linear instability growth rate, as calculated for Supernova type II environments. On the formal level, for wave vector parallel or perpendicular to the magnetic field the instability growth rate is found from the unmagnetized case replacing the plasma frequency by the appropriated Trivelpiece-Gould frequency. The growth rate associated with oblique propagation is also obtained

Evaluación del desempeño analítico mediante la Sigmametría en el Laboratorio de Bioquímica del Hospital Daniel A. Carrión, Lima 2015

El documento digital no refiere asesorPublicación a texto completo no autorizada por el autorDetermina el nivel del desempeño analítico mediante la Sigmametría en el Laboratorio de Bioquímica del Hospital Nacional Daniel A. Carrión, Lima 2015. Material y Métodos: Es un estudio descriptivo y transversal cuya muestra lo constituyen las 13 pruebas bioquímicas más frecuentemente solicitadas según el Reporte Estadístico Mensual 2014. Se usó un Suero Control de Tercera Opinión (de 2 niveles de concentración: Normal y Patológico) al cual se le midieron los 13 analitos mediante 15 corridas por cada uno. Primero se determinó la precisión y la veracidad, luego el Error Total y finalmente el Sigma para cada analito. El Desempeño Analítico se evaluó mediante el nivel Sigma obtenido para cada analito, dichos niveles son: Inaceptable (<(2σ), Marginal (3σ), Bueno (4σ), Excelente (5σ) y Óptimo (6σ). Resultados: Los analitos con Sigmametría “Optima” fueron el Ácido Úrico, Albumina, Bilirrubina Total, Creatinina, Proteína Total y Triglicéridos; “Bueno” para Transaminasa Glutámico-Oxalacético, “Marginal” para Lactato Deshidrogenasa, “Pobre” para Bilirrubina Directa y Urea; “Inaceptable” para Colesterol Total, Glucosa y Transaminasa Glutámico-Pirúvica. Conclusión: El presente estudio permitió al Laboratorista conocer el desempeño analítico real, y al Clínico, saber el grado de Error Total con que se emiten los resultados por parte del Laboratorio de Bioquímica del Hospital.Trabajo académic

Multivariate analysis of the effect of staining beverages on the optical properties of two provisional restorative materials

To evaluate the effect of staining beverages on the color stability, translucency and gloss of two provisional restorative materials.Sixty discs (8 mm x 2 mm) were manufactured for Duralay and Protemp 4. The discs were randomly divided according to the beverages: tea, coffee, wine, Coca-Cola and “Chicha morada” (n=12). The discs were polished and initial recordings of color and translucency were made with a spectrophotometer, and the gloss was measured with a glossmeter. The discs were immersed for 5 days in each of the beverages at 37◦C, and the color, translucency and gloss were recorded again. The differences between the initial and final records were calculated to obtain the values of ΔE, ΔTP, ΔGU. For the analysis, the two-way MANOVA model was chosen, and the significance level was set at 5%.A significant interaction was observed between the type of material and the staining beverages on the changes observed in the values of ΔE, ΔTP, ΔGU (p<0.05). ΔE values for Duralay and Protemp 4 were affected by coffee (7.48±1.53) and wine (11.02±1.07), respectively. The greatest change in ΔTP for Duralay were generated by tea (-1.79±0.62), and coffee (-5.65±0.66) for Protemp 4. Gloss was affected mainly by coffee for both materials (Duralay = -6.44±1.17 , Protemp 4 = -8.28±1.09).The type of material and the pigment drinks act together to influence changes in color, translucency and gloss. The methacrylate-based resin was more stable than the bis-acrylic resin to changes in color, translucency and gloss

Neutrino magnetohydrodynamics

A new neutrino magnetohydrodynamics (NMHD) model is formulated, where the effects of the charged weak current on the electron-ion magnetohydrodynamic fluid are taken into account. The model incorporates in a systematic way the role of the Fermi neutrino weak force in magnetized plasmas. A fast neutrino-driven short wavelengths instability associated with the magnetosonic wave is derived. Such an instability should play a central role in strongly magnetized plasma as occurs in supernovae, where dense neutrino beams also exist. In addition, in the case of nonlinear or high frequency waves, the neutrino coupling is shown to be responsible for breaking the frozen-in magnetic field lines condition even in infinite conductivity plasmas. Simplified and ideal NMHD assumptions were adopted and analyzed in detail

Gene flow and genetic structure in the Galician population (NW Spain) according to Alu insertions

<p>Abstract</p> <p>Background</p> <p>The most recent <it>Alu </it>insertions reveal different degrees of polymorphism in human populations, and a series of characteristics that make them particularly suitable genetic markers for Human Biology studies. This has led these polymorphisms to be used to analyse the origin and phylogenetic relationships between contemporary human groups. This study analyses twelve <it>Alu </it>sequences in a sample of 216 individuals from the autochthonous population of Galicia (NW Spain), with the aim of studying their genetic structure and phylogenetic position with respect to the populations of Western and Central Europe and North Africa, research that is of special interest in revealing European population dynamics, given the peculiarities of the Galician population due to its geographical situation in western Europe, and its historical vicissitudes.</p> <p>Results</p> <p>The insertion frequencies of eleven of the <it>Alu </it>elements analysed were within the variability range of European populations, while Yb8NBC125 proved to be the lowest so far recorded to date in Europe.</p> <p>Taking the twelve polymorphisms into account, the GD value for the Galician population was 0.268. The comparative analyses carried out using the MDS, NJ and AMOVA methods reveal the existence of spatial heterogeneity, and identify three population groups that correspond to the geographic areas of Western-Central Europe, Eastern Mediterranean Europe and North Africa. Galicia is shown to be included in the Western-Central European cluster, together with other Spanish populations. When only considering populations from Mediterranean Europe, the Galician population revealed a degree of genetic flow similar to that of the majority of the populations from this geographic area.</p> <p>Conclusion</p> <p>The results of this study reveal that the Galician population, despite its geographic situation in the western edge of the European continent, occupies an intermediate position in relation to other European populations in general, and Iberian populations in particular. This confirms the important role that migratory movements have had in the European gene pool, at least since Neolithic times. In turn, the MDS and NJ analyses place Galicia within the group comprised of Western-Central European populations, which is justified by the influence of Germanic peoples on the Galician population during the Middle Ages. However, it should also be noted that some of the markers analysed have a certain degree of differentiation, possibly due to the region's position as a 'cul-de-sac' in terms of Iberian population dynamics.</p

Representaciones sociales sobre el concepto de gobierno de jóvenes de secundaria en áreas rurales de la región Caribe colombiana

This research article identifies the conceptions that young people from secondary school in rural areas construct about the government, analyzed from the theory of social representations and from the socioeconomic variables of the context in which they are immersed. This bases its objectives on describing the influence that the aforementioned variables exert on the way in which young people conceive the role of government and its role in the construction of citizenship. The present research is oriented from a non-experimental, transectional descriptive methodology, based on a postpositivist paradigm, using a type of intentional or convenience sampling. The results showed that among young people there is a high degree of mistrust and lack of credibility towards the government and its leaders and as a conclusion it is considered that this trend is due to the relationship between corruption, government levels and the individual interests of some rulers.Este artículo de investigación identifica las concepciones que construyen los jóvenes de secundaria de áreas rurales sobre el gobierno, analizadas desde la teoría de las representaciones sociales y desde las variables socioeconómicas del contexto en el cual se encuentran inmersos. Esta basa sus objetivos en describir la influencia que las variables mencionadas ejercen sobre la manera en que los jóvenes conciben la función del gobierno y su papel en la construcción de ciudadanía. La presente investigación se orienta desde una metodología de corte descriptivo transeccional no experimental, apoyada en un paradigma postpositivista, empleando un tipo de muestreo intencional o por conveniencia. Los resultados permitieron demostrar que entre los jóvenes existe un alto grado de desconfianza y falta de credibilidad hacía el gobierno y sus líderes y como conclusión se considera que esta tendencia obedece a la relación existente entre la corrupción, los estamentos gubernamentales y los&nbsp; &nbsp;intereses individuales de algunos gobernante