Evaluación de propiedades del mortero incorporando ceniza de cola de caballo y hojas de espino para muros portantes, Ayacucho – 2022

El propósito de la investigación fue determinar la resistencia que logran los muros portantes al agregarles cenizas de cola de caballo (CCC) y hojas de espino (CHE) en sus diferentes dosificaciones: 5%, 7%, 9% y 11% con respecto al cemento. El estudio se realizará en la ciudad de Ayacucho en el año 2022. La metodología empleada es de tipo aplicada, diseño experimental, nivel explicativo y enfoque cuantitativo. La población está compuesta por las unidades de mortero y pilas de ladrillos. La muestra fue de 162 elementos. Los resultados muestran que en la resistencia a la compresión de probetas cúbicas de mortero la adición del 9% de CCC y 7% de CHE tienen los mejores resultados, ya que presentan un incremento de 217.6 kg/cm2 a 240.4 kg/cm2 y a 243.5 kg/cm2, respectivamente y también se tiene un incremento de 67.8 kg/cm2 a 83.6 kg/cm2 para la adición del 9% de CCC e igualmente de 67.8 kg/cm2 a 86.8 kg/cm2 para la adición del 7% de CHE, en la resistencia a la compresión de pilas de ladrillos. Por ello, se concluye que la adición de CCC y CHE mejora las propiedades físicas y mecánicas del mortero para muros portantes

Factores de riesgo de mortalidad en pacientes con neumonía adquirida en la comunidad

Introduction: the acquired pneumonia in the community is defined as an inflammation of the lung parenchyma by an infectious agent. Objective: to determine the potential risk factors of mortality of different variables. Method: an analytical study was realized of such cases and controls in patients admitted in the Room of Internal Medicine at “Celestino Hernández Robau” Hospital with diagnosis of acquired pneumonia in the community in the period from January to December 2015. Results: the leukopenia and the hypotension detected at admission and ages 60 and older and prolonged bed rest behaved as the most common risk factors associated with mortality. Chronic obstructive pulmonary disease, history of cerebrovascular disease and the presence of neoplasms represent a fourfold increased risk as predictors. Conclusions: other variables such as submitting pneumonia in a shorter period of time than a year, history of ischemic heart disease, heart failure, alcoholism, chronic steroid use, diabetes mellitus, liver cirrhosis, smoking and presence of pleural effusion associated to an increased risk of mortality in relation to the control group, although to a lesser extent than before.Introducción: la neumonía adquirida en la comunidad se define como una inflamación del parénquima pulmonar por un agente infeccioso. Objetivo: determinar los posibles factores de riesgo de mortalidad de diferentes variables. Método: se realizó un estudio analítico de tipo casos y controles en pacientes ingresados en la Sala de Medicina Interna del Hospital “Celestino Hernández Robau” con diagnóstico de neumonía adquirida en la comunidad en el período de enero a diciembre de 2015. Resultados: la leucopenia y la hipotensión arterial detectadas al momento del ingreso, así como las edades de 60 años y más y el estar encamados por largo tiempo se comportaron como los factores de riesgo más frecuentes asociados a mortalidad. La enfermedad pulmonar obstructiva crónica, el antecedente de enfermedad cerebrovascular y la presencia de neoplasias suponen un riesgo cuatro veces mayor como predictores. Conclusiones: otras variables como haber presentado otra neumonía en un período de tiempo menor de un año, antecedentes de cardiopatía isquémica, insuficiencia cardíaca, alcoholismo, uso prolongado de esteroides, diabetes mellitus, cirrosis hepática, hábito de fumar y presencia de derrame pleural se asociaron a un riesgo mayor de mortalidad en relación con el grupo de controles, aunque en menor magnitud que los anteriores

Keck HIRES Spectroscopy of Extragalactic HII Regions: C and O Abundances from Recombination Lines

We present very deep spectrophotometry of 14 bright extragalactic HII regions belonging to spiral, irregular, and blue compact galaxies. The data for 13 objects were taken with the HIRES echelle spectrograph on the Keck I telescope. We have measured CII recombination lines in 10 of the objects and OII recombination lines in 8 of them. We have determined electron temperatures from line ratios of several ions, specially of low ionization potential ones. We have found a rather tight linear empirical relation between Te([NII]) and Te([OIII]). We have found that OII lines give always larger abundances than [OIII] lines. Moreover, the difference of both O++ abundance determinations --the so-called abundance discrepancy factor-- is very similar in all the objects, with a mean value of 0.26+/-0.09 dex, independently of the properties of the HII region and of the parent galaxy. Using the observed recombination lines, we have determined the O, C, and C/O radial abundance gradients for 3 spiral galaxies: M33, M101, and NGC2403, finding that C abundance gradients are always steeper than those of O, producing negative C/O gradients accross the galactic disks. This result is similar to that found in the Milky Way and has important implications for chemical evolution models and the nucleosynthesis of C.Comment: Accepted for publication in ApJ, 54 pages, 4 figure

Antioxidant Profile of Different Types of Herbal Infusions and Teas Commercially Available in Mexico

Different types of teas and herbal infusions were studied. Antioxidant properties and phenolics compounds were estimated. Camellia sinensis based teas presented the highest values for inhibition of free radicals such as DPPH· and ABTS·+. The results showed different values between teas (Camellia sinensis) and herbal infusions (as Hibiscus sabdariffa). Green tea presented the highest values for inhibition of lipid oxidation (95.03 ± 3.34 to 31.68 ± 14.50 %) and polyphenolics content (0.112 ± 0.018 to 1.343 ± 0.068 GAE mg mL-1). In HPLC test, suggested the presence of antioxidant compounds such as epsyringic acid, procyanidin among others phenolic compounds. This study concluded that mexican teas and herbal infusions have potential to provide several benefits for human health, due to phenolic compounds present in them

The Latin American experience of allografting patients with severe aplastic anaemia: real-world data on the impact of stem cell source and ATG administration in HLA-identical sibling transplants

We studied 298 patients with severe aplastic anaemia (SAA) allografted in four Latin American countries. The source of cells was bone marrow (BM) in 94 patients and PBSCs in 204 patients. Engraftment failed in 8.1% of recipients with no difference between BM and PBSCs (P = 0.08). Incidence of acute GvHD (aGvHD) for BM and PBSCs was 30% vs 32% (P = 0.18), and for grades III–IV was 2.6% vs 11.6% (P = 0.01). Chronic GvHD (cGvHD) between BM and PBSCs was 37% vs 59% (P = 0.002) and extensive 5% vs 23.6% (P = 0.01). OS was 74% vs 76% for BM vs PBSCs (P = 0.95). Event-free survival was superior in patients conditioned with anti-thymocyte globulin (ATG)-based regimens compared with other regimens (79% vs 61%, P = 0.001) as excessive secondary graft failure was seen with other regimens (10% vs 26%, P = 0.005) respectively. In multivariate analysis, aGvHD II–IV (hazard ratio (HR) 2.50, confidence interval (CI) 1.1–5.6, P = 0.02) and aGvHD III–IV (HR 8.3 CI 3.4–20.2, Po0.001) proved to be independent negative predictors of survival. In conclusion, BM as a source of cells and ATG-based regimens should be standard because of higher GvHD incidence with PBSCs, although the latter combining with ATG in the conditioning regimen could be an option in selected high-risk patient

Lezama Lima : orígenes, revolución y después

El libro constituye el resultado de una selección de trabajos expuestos en el Congreso Internacional "El caribe en sus literaturas y culturas. En el centenario de José Lezama Lima", llevado a cabo en la ciudad de Córdoba y organizado por la UNC y la UNLP, durante el año 2010. La selección coordinada, editada y puesta en diálogo pretende constituir un aporte en torno al estado de la cuestión en los estudios lezamianos y una vuelta de tuerca en torno a diversas concepciones que han regulado el canon Los procesos de internacionalización y las diversas recepciones, apropiaciones, regulaciones y prohibiciones que pesan sobre la obra de Lezama son abordados por diferentes autores, además de trabajo que exponen un análisis pormenorizado de su poética puesta en diálogo con otras producciones del Caribe.Fil. Calomarde, Nancy. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Escuela de Letras; Argentina.Fil: Santiago, Olga Beatriz. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Escuela de Letras; Argentina.Fil: Dalmagro, María Cristina. Universidad Nacional de Córdoba. Facultad de Lenguas; Argentina.Fil: Gómez, Susana. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Escuela de Letras; Argentina.Literaturas Específica

Antimicrobial resistance among migrants in Europe: a systematic review and meta-analysis

BACKGROUND: Rates of antimicrobial resistance (AMR) are rising globally and there is concern that increased migration is contributing to the burden of antibiotic resistance in Europe. However, the effect of migration on the burden of AMR in Europe has not yet been comprehensively examined. Therefore, we did a systematic review and meta-analysis to identify and synthesise data for AMR carriage or infection in migrants to Europe to examine differences in patterns of AMR across migrant groups and in different settings. METHODS: For this systematic review and meta-analysis, we searched MEDLINE, Embase, PubMed, and Scopus with no language restrictions from Jan 1, 2000, to Jan 18, 2017, for primary data from observational studies reporting antibacterial resistance in common bacterial pathogens among migrants to 21 European Union-15 and European Economic Area countries. To be eligible for inclusion, studies had to report data on carriage or infection with laboratory-confirmed antibiotic-resistant organisms in migrant populations. We extracted data from eligible studies and assessed quality using piloted, standardised forms. We did not examine drug resistance in tuberculosis and excluded articles solely reporting on this parameter. We also excluded articles in which migrant status was determined by ethnicity, country of birth of participants' parents, or was not defined, and articles in which data were not disaggregated by migrant status. Outcomes were carriage of or infection with antibiotic-resistant organisms. We used random-effects models to calculate the pooled prevalence of each outcome. The study protocol is registered with PROSPERO, number CRD42016043681. FINDINGS: We identified 2274 articles, of which 23 observational studies reporting on antibiotic resistance in 2319 migrants were included. The pooled prevalence of any AMR carriage or AMR infection in migrants was 25·4% (95% CI 19·1-31·8; I2 =98%), including meticillin-resistant Staphylococcus aureus (7·8%, 4·8-10·7; I2 =92%) and antibiotic-resistant Gram-negative bacteria (27·2%, 17·6-36·8; I2 =94%). The pooled prevalence of any AMR carriage or infection was higher in refugees and asylum seekers (33·0%, 18·3-47·6; I2 =98%) than in other migrant groups (6·6%, 1·8-11·3; I2 =92%). The pooled prevalence of antibiotic-resistant organisms was slightly higher in high-migrant community settings (33·1%, 11·1-55·1; I2 =96%) than in migrants in hospitals (24·3%, 16·1-32·6; I2 =98%). We did not find evidence of high rates of transmission of AMR from migrant to host populations. INTERPRETATION: Migrants are exposed to conditions favouring the emergence of drug resistance during transit and in host countries in Europe. Increased antibiotic resistance among refugees and asylum seekers and in high-migrant community settings (such as refugee camps and detention facilities) highlights the need for improved living conditions, access to health care, and initiatives to facilitate detection of and appropriate high-quality treatment for antibiotic-resistant infections during transit and in host countries. Protocols for the prevention and control of infection and for antibiotic surveillance need to be integrated in all aspects of health care, which should be accessible for all migrant groups, and should target determinants of AMR before, during, and after migration. FUNDING: UK National Institute for Health Research Imperial Biomedical Research Centre, Imperial College Healthcare Charity, the Wellcome Trust, and UK National Institute for Health Research Health Protection Research Unit in Healthcare-associated Infections and Antimictobial Resistance at Imperial College London

Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at √ s = 8 TeV with the ATLAS detector

Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses 20.3 fb−1 of √ s = 8 TeV data collected in 2012 with the ATLAS detector at the LHC. Events are required to have at least one jet with pT > 120 GeV and no leptons. Nine signal regions are considered with increasing missing transverse momentum requirements between Emiss T > 150 GeV and Emiss T > 700 GeV. Good agreement is observed between the number of events in data and Standard Model expectations. The results are translated into exclusion limits on models with either large extra spatial dimensions, pair production of weakly interacting dark matter candidates, or production of very light gravitinos in a gauge-mediated supersymmetric model. In addition, limits on the production of an invisibly decaying Higgs-like boson leading to similar topologies in the final state are presente

Search for chargino-neutralino production with mass splittings near the electroweak scale in three-lepton final states in √s=13 TeV pp collisions with the ATLAS detector

A search for supersymmetry through the pair production of electroweakinos with mass splittings near the electroweak scale and decaying via on-shell W and Z bosons is presented for a three-lepton final state. The analyzed proton-proton collision data taken at a center-of-mass energy of √s=13  TeV were collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fb−1. A search, emulating the recursive jigsaw reconstruction technique with easily reproducible laboratory-frame variables, is performed. The two excesses observed in the 2015–2016 data recursive jigsaw analysis in the low-mass three-lepton phase space are reproduced. Results with the full data set are in agreement with the Standard Model expectations. They are interpreted to set exclusion limits at the 95% confidence level on simplified models of chargino-neutralino pair production for masses up to 345 GeV