Propiedades del suelo y follaje del nogal pecanero en la región norte de Coahuila, México / Soil and foliar properties in walnut trees in the region of northern of Coahuila, Mexico

El objetivo del presente estudio fue determinar la calidad nutricional del cultivo de nogal pecanero mediante análisis de suelo y foliares en el norte de Coahuila. Los muestreos se hicieron de junio a septiembre de 2017 en siete huertas de nogal, tres huertas con manejo orgánico y cuatro con manejo convencional. Los muestreos de suelo se hicieron en 31 sitios, en cada uno se tomaron muestras a tres profundidades: 00-30, 30-60, 60-90 cm, cada una se colocó en bolsas plásticas etiquetadas. Para el muestreo foliar, se tomaron muestras al azar en 25 árboles en cada huerta, se colectaron 100 foliolos ubicadas en la parte media del brote del año, todos los foliolos se colocaron en bolsas de papel etiquetadas. Todas las muestras se enviaron al laboratorio para determinar las propiedades del suelo y contenido nutricional de los macros y microelementos presentes. Los resultados indican que los suelos de la Región Norte son altamente salinos, muy altos en Contenidos de Carbonatos totales (68%), Capacidad de Intercambio Catiónico (27.5 meq/100 gr), pH fuertemente alcalino (8.10-8.97), deficientes en N, P, Fe y Zn. En relación a los elementos en el follaje, se encontró que la mayoría se encuentra dentro de los Rangos de Suficiencia Nutricional reportados para dos regiones con condiciones edáficas similares a la Región Norte de Coahuila. Lo anterior posiblemente por las aplicaciones de nutrientes minerales durante el ciclo vegetativo de este frutal.

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries