¿Por qué perdió la izquierda lopezobradorista?

Está claro que el PRD y Andrés Manuel López Obrador cometieron errores en su campaña que también contribuyeron a alejar a cierto sector de votantes o a inhibir el voto de los indecisos. Pero según este artículo uno de los factores que particularmente contribuyó para el triunfo de Felipe Calderón fue la estrategia del voto negativo que cambia las coordenadas de la contienda.ITESO, A.C

Application of machine-learning algorithms to predict the transport properties of Mie fluids

The ability to predict transport properties of fluids, such as the self-diffusion coefficient and viscosity, has been an ongoing effort in the field of molecular modelling. While there are theoretical approaches to predict the transport properties of simple systems, they are typically applied in the dilute gas regime and are not directly applicable to more complex systems. Other attempts to predict transport properties are done by fitting available experimental or molecular simulation data to empirical or semi-empirical correlations. Recently, there have been attempts to improve the accuracy of these fittings through the use of Machine Learning (ML) methods. In this work, the application of ML algorithms to represent the transport properties of systems comprising spherical particles interacting via the Mie potential is investigated. To this end, the self-diffusion coefficient and shear viscosity of 54 potentials are obtained at different regions of the fluid-phase diagram. This data set is used together with three ML algorithms, namely k-Nearest Neighbours, Artificial Neural Network and Symbolic Regression, to find correlations between the parameters of each potential and the transport properties at different densities and temperatures. It is shown that ANN and KNN perform to a similar extent, followed by SR, which exhibits larger deviations. Finally, the application of the three ML models to predict the self-diffusion coefficient of small molecular systems, such as krypton, methane and carbon dioxide is demonstrated using molecular parameters derived from the so-called SAFT-VR Mie equation of state [J. Chem. Phys. 139, 154504 (2013)] and available experimental vapour-liquid coexistence data.UK Engineering and Physical Sciences Research Council (EP-441SRC) via an Industrial Cooperative Award in Science & Technology (ICASE) co-funded by IBM, project ID 2327699 - EP/T517689/1A.P. is supported by a “Maria Zambrano Senior” fellowship, financed by the European Union within the NextGenerationEU program and the Spanish Ministry of UniversitiesHartree National Centre for Digital Innovatio

Challenges in Quasinormal Mode Extraction: Perspectives from Numerical solutions to the Teukolsky Equation

The intricacies of black hole ringdown analysis are amplified by the absence of a complete set of orthogonal basis functions for quasinormal modes. Although damped sinusoids effectively fit the ringdown signals from binary black hole mergers, the risk of overfitting remains, due to initial transients and nonlinear effects. In light of this challenge, we introduce two methods for extracting quasinormal modes in numerical simulations and qualitatively study how the transient might affect quasinormal mode fitting. In one method, we accurately fit quasinormal modes by using their spatial functional form at constant time hypersurfaces, while in the other method, we exploit both spatial and temporal aspects of the quasinormal modes. Both fitting methods leverage the spatial behavior of quasinormal eigenfunctions to enhance accuracy, outperforming conventional time-only fitting techniques at null infinity. We also show that we can construct an inner product for which the quasinormal eigenfunctions form an orthonormal (but not complete) set. We then conduct numerical experiments involving linearly perturbed Kerr black holes in horizon penetrating, hyperboloidally compactified coordinates, as this setup enables a more precise isolation and examination of the ringdown phenomenon. From solutions to the Teukolsky equation, describing scattering of an ingoing gravitational wave pulse, we find that the contributions from early-time transients can lead to large uncertainties in the fit to the amplitudes of higher overtones ($n\geq 3$) when the signal is fitted over a short time interval. While the methods we discuss here cannot be applied directly to data from merger observations, our findings underscore the persistence of ambiguities in interpreting ringdown signals, even with access to both temporal and spatial information

Conception rate of artificially inseminated holstein cows affected by cloudy vaginal mucus, under intense heat conditions.

The objective of this work was to obtain prevalence estimates of cloudy vaginal mucus in artificially inseminated Holstein cows raised under intense heat, in order to assess the effect of meteorological conditions on its occurrence during estrus and to determine its effect on conception rate. In a first study, an association was established between the occurrence of cloudy vaginal mucus during estrus and the conception rate of inseminated cows (18,620 services), raised under intense heat (mean annual temperature of 22°C), at highly technified farms, in the arid region of northern Mexico. In a second study, data from these large dairy operations were used to assess the effect of meteorological conditions throughout the year on the occurrence of cloudy vaginal mucus during artificial insemination (76,899 estruses). The overall rate of estruses with cloudy vaginal mucus was 21.4% (16,470/76,899; 95% confidence interval = 21.1?21.7%). The conception rate of cows with clean vaginal mucus was higher than that of cows with abnormal mucus (30.6 vs. 22%). Prevalence of estruses with cloudy vaginal mucus was strongly dependent on high ambient temperature and markedly higher in May and June. Acceptable conception rates in high milk-yielding Holstein cows can only be obtained with cows showing clear and translucid mucus at artificial insemination.Título em português: Taxa de concepção de vacas Holandesas inseminadas artificialmente e afetadas por muco vaginal turvo, sob condições de intenso calor

Collective behavior and virulence arsenal of the fish pathogen Piscirickettsia salmonis in the biofilm realm

Piscirickettsiosis is a fish disease caused by the Gram-negative bacterium Piscirickettsia salmonis. This disease has a high socio-economic impact on the Chilean salmonid aquaculture industry. The bacterium has a cryptic character in the environment and their main reservoirs are yet unknown. Bacterial biofilms represent a ubiquitous mechanism of cell persistence in diverse natural environments and a risk factor for the pathogenesis of several infectious diseases, but their microbiological significance for waterborne veterinary diseases, including piscirickettsiosis, have seldom been evaluated. This study analyzed the in vitro biofilm behavior of P. salmonis LF-89T (genogroup LF-89) and CA5 (genogroup EM-90) using a multi-method approach and elucidated the potential arsenal of virulence of the P. salmonis LF-89T type strain in its biofilm state. P. salmonis exhibited a quick kinetics of biofilm formation that followed a multi-step and highly strain-dependent process. There were no major differences in enzymatic profiles or significant differences in cytotoxicity (as tested on the Chinook salmon embryo cell line) between biofilm-derived bacteria and planktonic equivalents. The potential arsenal of virulence of P. salmonis LF-89T in biofilms, as determined by whole-transcriptome sequencing and differential gene expression analysis, consisted of genes involved in cell adhesion, polysaccharide biosynthesis, transcriptional regulation, and gene mobility, among others. Importantly, the global gene expression profiles of P. salmonis LF-89T were not enriched with virulence-related genes upregulated in biofilm development stages at 24 and 48 h. An enrichment in virulence-related genes exclusively expressed in biofilms was also undetected. These results indicate that early and mature biofilm development stages of P. salmonis LF-89T were transcriptionally no more virulent than their planktonic counterparts, which was supported by cytotoxic trials, which, in turn, revealed that both modes of growth induced important and very similar levels of cytotoxicity on the salmon cell line. Our results suggest that the aforementioned biofilm development stages do not represent hot spots of virulence compared with planktonic counterparts. This study provides the first transcriptomic catalogue to select specific genes that could be useful to prevent or control the (in vitro and/or in vivo) adherence and/or biofilm formation by P. salmonis and gain further insights into piscirickettsiosis pathogenesis

Distribución espacial de la precipitación sobre el crecimiento inicial del cedro rojo (Cedrela odorata L.)

Objective: To analyze the effect of the spatial variability of precipitation on the initialgrowth of red cedar (Cedrella odorata L.) in Soconusco, Chiapas, Mexico.Design / methodology / approach: The plantations were established in June 2010 inSuchiate, Tapachula and Tuxtla Chico, Chiapas; with a density of 1,111 trees ha -1planted and spaced 3.0 mx 3.0 m. Every six months (210-2014) tree height (h; m) anddiameter at chest height (DBH; cm) were measured).Results: The average annual height of the trees was correlated; with the accumulatedannual precipitation (Pp; mm), and a simple linear regression equation (R2= 0.94) wasdetermined, which predicts that the growth of the red cedar was 0.09 m for every 100mm of precipitation observed in the different localities. Likewise, its initial growth wasadjusted with a high level of confidence (P?0.001) to the first phase of the Richardssigmoidal model and, from its first derivative, the annual growth rates were determined:2.58 m year-1, 2.05 year -1 and 1.86 year -1 m for the towns of Tapachula, Tuxtla Chicoand Suchiate, respectively.Study limitations / implications: The first phase of the Richards model is onlyapplicable for the initial growth of red cedar and, beyond four years of age, it presentserrors. 2Conclusions: The first phase of Richards' sigmoidal model under the conditionsstudied, predicts with high confidence the initial growth of red cedar for the conditions ofSoconusco, Chiapas.Objetivo: Analizar el efecto de la variabilidad espacial de la precipitación sobre el crecimiento inicial del cedro rojo (Cedrella odorata L.) en el Soconusco; Chiapas, México.Diseño/metodología/aproximación: Las plantaciones se establecieron en junio de 2010 en Suchiate, Tapachula y Tuxtla Chico, Chiapas; con una densidad de 1,111 árboles ha -1 sembrados y espaciados 3.0 m x 3.0 m. Cada seis meses (210-2014) se midieron altura del árbol (h; m) y diámetro a la altura del pecho (DAP; cm).Resultados: Se correlacionó la altura promedio anual de los árboles; con la precipitación anual acumulada (Pp; mm), y se determinó una ecuación de regresión lineal simple (R 2 =0.94), la cual predice que, el crecimiento del cedro rojo fue de 0.09 m por cada 100 mm de precipitación observada en las diferentes localidades. Asimismo, su crecimiento inicial se ajustó con alto nivel de confianza (P?0.001) a la primera fase del modelo sigmoidal de Richards y, a partir de su primera derivada, se determinaron las tasas de crecimiento anual: 2.58 m año -1 , 2.05 m año -1 y 1.86 m año -1 para las localidades de Tapachula, Tuxtla Chico y Suchiate, respectivamente.Limitaciones del estudio/implicaciones: La primera fase del modelo Richards, sólo es aplicable para el crecimiento inicial del cedro rojo y, más allá de cuatro años de edad presenta errores.Hallazgos/conclusiones: La primera fase del modelo sigmoidal de Richards bajo lascondiciones estudiadas, predice con alto nivel de confianza el crecimiento inicial delcedro rojo para las condiciones del Soconusco, Chiapas

Protegiendo el derecho a la salud bucodental de niños, niñas y adolescentes

Fil: Isla, Carolina. Universidad Nacional de Córdoba. Facultad de Odontología. Cátedra de Prostodoncia II B; Argentina.Fil: Panero, Marcela. Ministerio de Salud de la Provincia de Córdoba. Instituto Provincial de Odontología; Argentina.Fil: Avendaño, Josefina L. Ministerio de Salud de la Provincia de Córdoba. Instituto Provincial de Odontología; Argentina.Fil: García Brasca, María Fernanda. Ministerio de Salud de la Provincia de Córdoba. Instituto Provincial de Odontología; Argentina.ObjetivoContribuir a garantizar el cumplimiento de los derechos de niños niñas y adolescentes sin cuidados parentales en las residencias de acogimiento transitorio; mediante acciones de promoción de la salud bucodental y prevención odontológica.MetodologíaProyecto socioeducativo destinado a niños, niñas y adolescentes que se encuentran sin cuidados parentales de manera temporal, debido a medidas de carácter excepcional, en residencias de SeNAF distribuidas en Córdoba. Las mismas, constituyen un sistema de protección integral de derechos para niñas, niños y adolescentes. La intervención se ejecutó en momentos de participación, como: inicio (escucha), desarrollo (construcción del proceso educativo), cierre (evaluación). Se realizaron prácticas de autocuidado de salud general y bucodental para Niñas, Niños y Adolescentes y aquellos que trabajan en el cuidado y educación de los mismos. Se llevaron a cabo talleres, charlas y actividades lúdicas sobre: derecho a la salud, importancia de la salud general y bucal, partes constitutivas de la boca, dentición humana, desarrollo bucal, prácticas saludables y hábitos perjudiciales, higiene bucal, alimentación saludable, tabaco, prevención específica de patologías bucodentales. Los odontólogos del IPO visitaron las residencias cada 15 días, hicieron el examen bucal y diagnóstico. Para mejorar la accesibilidad a distintas acciones de promoción, prevención y asistencia de la salud bucal según necesidades, se articulo con la agenda de turnos del I.P.O. para garantizar la atención. Se confeccionó un directorio de Servicios públicos de Odontología para las Residencias.Resultados DICIEMBRE 2021 a la actualidad.Se visitaron 9 residencias de Córdoba capital. Se entregaron 130 kits de higiene bucal. Se realizaron: 100 Exámenes bucodentales, 100 topicaciones con flúor, 100 técnicas de higiene bucal, 9 teatralizaciones y 30 rehabilitaciones bucales. ConclusionesNuestras acciones evidencian la necesidad de fortalecer la línea de cuidado en salud bucal.https://revistas.unc.edu.ar/index.php/RevFacOdonto/issue/view/2569Fil: Isla, Carolina. Universidad Nacional de Córdoba. Facultad de Odontología. Cátedra de Prostodoncia II B; Argentina.Fil: Panero, Marcela. Ministerio de Salud de la Provincia de Córdoba. Instituto Provincial de Odontología; Argentina.Fil: Avendaño, Josefina L. Ministerio de Salud de la Provincia de Córdoba. Instituto Provincial de Odontología; Argentina.Fil: García Brasca, María Fernanda. Ministerio de Salud de la Provincia de Córdoba. Instituto Provincial de Odontología; Argentina.Otras Ciencias de la Salu

Astrobites as a Community-led Model for Education, Science Communication, and Accessibility in Astrophysics

Support for early career astronomers who are just beginning to explore astronomy research is imperative to increase retention of diverse practitioners in the field. Since 2010, Astrobites has played an instrumental role in engaging members of the community -- particularly undergraduate and graduate students -- in research. In this white paper, the Astrobites collaboration outlines our multi-faceted online education platform that both eases the transition into astronomy research and promotes inclusive professional development opportunities. We additionally offer recommendations for how the astronomy community can reduce barriers to entry to astronomy research in the coming decade

Sublittoral soft bottom communities and diversity of Mejillones Bay in northern Chile (Humboldt Current upwelling system)

The macrozoobenthos of Mejillones Bay (23°S; Humboldt Current) was quantitatively investigated over a 7-year period from austral summer 1995/1996 to winter 2002. About 78 van Veen grab samples taken at six stations (5, 10, 20 m depth) provided the basis for the analysis of the distribution of 60 species and 28 families of benthic invertebrates, as well as of their abundance and biomass. Mean abundance (2,119 individuals m-2) was in the same order compared to a previous investigation; mean biomass (966 g formalin wet mass m-2), however, exceeded prior estimations mainly due to the dominance of the bivalve Aulacomya ater. About 43% of the taxa inhabited the complete depth range. Mean taxonomic Shannon diversity (H', Log e) was 1.54 ± 0.58 with a maximum at 20 m (1.95 ± 0.33); evenness increased with depth. The fauna was numerically dominated by carnivorous gastropods, polychaetes and crustaceans (48%). About 15% of the species were suspensivorous, 13% sedimentivorous, 11% detritivorous, 7% omnivorous and 6% herbivorous. Cluster analyses showed a significant difference between the shallow and the deeper stations. Gammarid amphipods and the polychaete family Nephtyidae characterized the 5-mzone, the molluscs Aulacomya ater, Mitrella unifasciata and gammarids the intermediate zone, while the gastropod Nassarius gayi and the polychaete family Nereidae were most prominent at the deeper stations. The communities of the three depth zones did not appear to be limited by hypoxia during non-El Niño conditions. Therefore, no typical change in community structure occurred during El Niño 1997–1998, in contrast to what was observed for deeper faunal assemblages and hypoxic bays elsewhere in the coastal Humboldt Current system