Relaciones entre pH, aluminio y materia orgánica en algunos suelos de Colombia.

Se determinaron las relaciones existentes entre pH, el Al intercambiable y el contenido de materia orgánica en varios suelos del país. Se utilizaron los resultados de 833 análisis de suelos provenientes en su mayoría de las regiones naturales, dichos análisis se realizaron en el Laboratorio de Suelos del ICA, el Al intercambiable se determinó en suelos con pH inferior o igual a 5.5 y las muestras se agruparon de acuerdo a su contenido de materia orgánica, en 2 grupos: uno con contenido mayor del 10 por ciento y el otro, con contenido menor del 10 por ciento. Debido a que la mayoría de muestras provenían de las 3 regiones naturales: Cordilleras Andinas, Sabana de Bogotá y Llanos Orientales, sólo se presentan los resultados de las mismas, éstos demuestran que existe una relación inversa entre el contenido de Al y el pH, relación que es menos estrecha en los Llanos Orientales que en las otras 2 regiones naturales. En las Cordilleras Andinas y en la Sabana de Bogotá, las variaciones del pH debidas a la acción del Al no están afectadas por el contenido de materia orgánic

Entrenamiento de flexibilidad integradora para mejorar la movilidad articular y el rango de movimiento en bailarinas de jazz

[Abstract] Flexibility is one of the physical capacities associated with improved performance in jazz dancers girls. However, jazz training being a complex physical activity is not only based on flexibility training, it also focuses on the development of motor skills, technique, posture, and rhythm. Therefore, it is important to demonstrate whether a passive stretching training, with minimum frequency, generates favorable results on flexibility. The purpose of this study is to determine the effect of flexibility training on active and passive range of motion (ROM), as well as joint mobility in girls jazz dancers by chronological caracterizar la muestra age group. 30 jazz dancers with an average age of 8.5 ± 1.6 years with no more than four years practicing professional sports practice, enrolled in an integrative flexibility training program developed once a week for 12 weeks, and were assessed for active and passive hip joint mobility through goniometry in conjunction with six flexibility tests. There was an increase in all flexibility variables with a moderate size-effect, except for the joint ROM in active and passive left abduction and active right flexion, which had a high effect. In conclusion, training focused on static exercises can be considered an effective strategy to develop ROM, because it's possible to increase flexibility and stretch in lower extremities with a frequency of once a week in jazz dancing girls.[Resumen] La flexibilidad es una de las capacidades físicas asociadas con la mejora del rendimiento en las niñas bailarinas de jazz. Sin embargo, el entrenamiento del jazz al ser una actividad física compleja no solo se basa en el entrenamiento de la flexibilidad, también se centra en el desarrollo de las habilidades motoras, la técnica, la postura y el ritmo. Por lo tanto, es importante demostrar si un entrenamiento de estiramiento estático de frecuencia mínima, genera resultados favorables en flexibilidad. El propósito de este estudio es determinar el efecto del entrenamiento de flexibilidad sobre el rango de movimiento (ROM) activo y pasivo, así como la movilidad articular en bailarinas de jazz de niñas por cronológico para caracterizar la muestra de grupos de edad. 30 bailarines de jazz con una edad promedio de 8.5 ± 1.6 años con no más de cuatro años practicando deporte profesional, inscritas en un programa de entrenamiento de flexibilidad integral desarrollado a realizarse una vez por semana durante 12 semanas. Se les evaluó la movilidad articular de cadera de forma activa y pasiva mediante goniometría junto con seis pruebas de flexibilidad. Hubo un aumento en todas las variables de flexibilidad con un efecto de tamaño moderado, excepto el ROM articular en abducción izquierda activa y pasiva y flexión derecha activa, que tuvo un efecto alto. En conclusión, el entrenamiento centrado en ejercicios estáticos puede considerarse una estrategia eficaz para desarrollar el ROM, y  aumentar la flexibilidad así como los estiramientos en el tronco inferior con una frecuencia de una vez a la semana en las bailarinas de jazz

On the sensitivity of the HAWC observatory to gamma-ray bursts

We present the sensitivity of HAWC to Gamma Ray Bursts (GRBs). HAWC is a very high-energy gamma-ray observatory currently under construction in Mexico at an altitude of 4100 m. It will observe atmospheric air showers via the water Cherenkov method. HAWC will consist of 300 large water tanks instrumented with 4 photomultipliers each. HAWC has two data acquisition (DAQ) systems. The main DAQ system reads out coincident signals in the tanks and reconstructs the direction and energy of individual atmospheric showers. The scaler DAQ counts the hits in each photomultiplier tube (PMT) in the detector and searches for a statistical excess over the noise of all PMTs. We show that HAWC has a realistic opportunity to observe the high-energy power law components of GRBs that extend at least up to 30 GeV, as it has been observed by Fermi LAT. The two DAQ systems have an energy threshold that is low enough to observe events similar to GRB 090510 and GRB 090902b with the characteristics observed by Fermi LAT. HAWC will provide information about the high-energy spectra of GRBs which in turn could help to understanding about e-pair attenuation in GRB jets, extragalactic background light absorption, as well as establishing the highest energy to which GRBs accelerate particles

Anemia prevalence in women of reproductive age in low- and middle-income countries between 2000 and 2018

Anemia is a globally widespread condition in women and is associated with reduced economic productivity and increased mortality worldwide. Here we map annual 2000–2018 geospatial estimates of anemia prevalence in women of reproductive age (15–49 years) across 82 low- and middle-income countries (LMICs), stratify anemia by severity and aggregate results to policy-relevant administrative and national levels. Additionally, we provide subnational disparity analyses to provide a comprehensive overview of anemia prevalence inequalities within these countries and predict progress toward the World Health Organization’s Global Nutrition Target (WHO GNT) to reduce anemia by half by 2030. Our results demonstrate widespread moderate improvements in overall anemia prevalence but identify only three LMICs with a high probability of achieving the WHO GNT by 2030 at a national scale, and no LMIC is expected to achieve the target in all their subnational administrative units. Our maps show where large within-country disparities occur, as well as areas likely to fall short of the WHO GNT, offering precision public health tools so that adequate resource allocation and subsequent interventions can be targeted to the most vulnerable populations.Peer reviewe

SUPLEMENTO DEL XV CONGRESO INTERNACIONAL DE ACTIVIDAD FÍSICA Y DEPORTE. 17,18 y 19 DE OCTUBRE DEL 2018. ENSENADA, BAJA CALIFORNIA, MÉXICO

Compendio, en formato artículo, de los mejores trabajos presentados en el XV CONGRESO INTERNACIONAL DE ACTIVIDAD FÍSICA Y DEPORTE celebrado los días  17,18 y 19 de octubre del 2018 en la Universidad Autónoma de Baja California en la ciudad de Ensenada, Baja California, México:La nutrición en la actividad física y deportiva: alimentos funcionales con nanotecnología, aplicaciones potenciales. González González, K.Y.; Huerta Plaza, B.A.; Amaya Parra, G. (118-130)Perfil antropométrico, físico y hábitos alimentarios en escolares indígenas de Tijuana México. Avendaño Cano, D.L.; Gómez Miranda, L.M.; Aburto Corona, J.A. (131-142)Relación entre el clima de aprendizaje en Educación Física y la percepción de los estudiantes en las competencias del profesorado. Baños, R; Ortiz-Camacho, M.M.; Baena-Extremera, A.; Granero-Gallegos, A.; Machado-Parra, J.P.; Rentería, I.; Acosta, I.; Ramírez, L. (143-153)Valoración de capacidades físicas, composición corporal y consumo de vitaminas en una competencia de Crossfit. Cervantes-Hernández, N.; Hernández Nájera, N.; Carrasco Legleu, C.E.; Candia Lujan, R.; Enríquez Del Castillo, L.A. (154-164)Relación de la actividad física, características antropométricas y VO2máx en jóvenes universitarios: características por género. Enríquez-del Castillo, L.A.; Cervantes-Hernández, N.; Carrasco-Legleu, C.E.; Candia Luján, R. (165-174)Entrenamiento vibratorio de cuerpo completo y sus efectos sobre la composición corporal en jóvenes universitarios. Flores-Chico, B.; Bañuelos-Teres, L.E.; Buendía Lozada, E.R.P. (175-183)Actualización curricular, plan 2016 de la Licenciatura en Cultura Física de la BUAP. Flores-Chico, B.; Flores-Flores, A.; López de La Rosa, LE.; Aguilar-Enríquez, R.I.; Caballero Gómez, JM; Villanueva-Huerta, JA. (184-192)Evaluación psicológica y de la musculatura isquiosural de basquetbolistas universitarias en distintas etapas deportivas. Moranchel-Charros, R.; Martínez-Velázquez, E.S. (193-203)Efecto del ejercicio físico sobre la fuerza, resistencia y riesgo de caída en mujeres adultas. Ortiz Ortiz, M; Espinoza Gutiérrez, R; Gómez Miranda, LM.; Guzmán Gutiérrez, EC.; Calleja Núñez, JJ. (204-212)Desigualdad vs igualdad numérica y su efecto en la técnica de jugadores de fútbol infantil. Vega-Orozco, SI; Gavotto Nogales, OI; Bernal Reyes, F; Horta Gim, MA; Sarabia Sainz, HM. (213-224

International nosocomial infection control consortium (INICC) report, data summary of 36 countries, for 2004-2009

The results of a surveillance study conducted by the International Nosocomial Infection Control Consortium (INICC) from January 2004 through December 2009 in 422 intensive care units (ICUs) of 36 countries in Latin America, Asia, Africa, and Europe are reported. During the 6-year study period, using Centers for Disease Control and Prevention (CDC) National Healthcare Safety Network (NHSN; formerly the National Nosocomial Infection Surveillance system [NNIS]) definitions for device-associated health care-associated infections, we gathered prospective data from 313,008 patients hospitalized in the consortium's ICUs for an aggregate of 2,194,897 ICU bed-days. Despite the fact that the use of devices in the developing countries' ICUs was remarkably similar to that reported in US ICUs in the CDC's NHSN, rates of device-associated nosocomial infection were significantly higher in the ICUs of the INICC hospitals; the pooled rate of central line-associated bloodstream infection in the INICC ICUs of 6.8 per 1,000 central line-days was more than 3-fold higher than the 2.0 per 1,000 central line-days reported in comparable US ICUs. The overall rate of ventilator-associated pneumonia also was far higher (15.8 vs 3.3 per 1,000 ventilator-days), as was the rate of catheter-associated urinary tract infection (6.3 vs. 3.3 per 1,000 catheter-days). Notably, the frequencies of resistance of Pseudomonas aeruginosa isolates to imipenem (47.2% vs 23.0%), Klebsiella pneumoniae isolates to ceftazidime (76.3% vs 27.1%), Escherichia coli isolates to ceftazidime (66.7% vs 8.1%), Staphylococcus aureus isolates to methicillin (84.4% vs 56.8%), were also higher in the consortium's ICUs, and the crude unadjusted excess mortalities of device-related infections ranged from 7.3% (for catheter-associated urinary tract infection) to 15.2% (for ventilator-associated pneumonia). Copyright © 2012 by the Association for Professionals in Infection Control and Epidemiology, Inc. Published by Elsevier Inc. All rights reserved

Mapping local patterns of childhood overweight and wasting in low- and middle-income countries between 2000 and 2017

A double burden of malnutrition occurs when individuals, household members or communities experience both undernutrition and overweight. Here, we show geospatial estimates of overweight and wasting prevalence among children under 5 years of age in 105 low- and middle-income countries (LMICs) from 2000 to 2017 and aggregate these to policy-relevant administrative units. Wasting decreased overall across LMICs between 2000 and 2017, from 8.4 (62.3 (55.1�70.8) million) to 6.4 (58.3 (47.6�70.7) million), but is predicted to remain above the World Health Organization�s Global Nutrition Target of <5 in over half of LMICs by 2025. Prevalence of overweight increased from 5.2 (30 (22.8�38.5) million) in 2000 to 6.0 (55.5 (44.8�67.9) million) children aged under 5 years in 2017. Areas most affected by double burden of malnutrition were located in Indonesia, Thailand, southeastern China, Botswana, Cameroon and central Nigeria. Our estimates provide a new perspective to researchers, policy makers and public health agencies in their efforts to address this global childhood syndemic. © 2020, The Author(s)