Estudio de las propiedades eléctricas de celdas solares sensibilizadas por puntos cuánticos de CdS/ZnS

In this work, was carried out a study of the electrical properties of quantum dots sensitized solar cells with cadmium, zinc and sulfur (CdZnS) quantum dots. The objective is to increase the absorption light in the electromagnetic spectrum through the growth of the material. In this work, quantum dots sensitized solar cells were manufactured with the TiO2/CdS/ZnS configuration. An experimental investigation was carried out varying the concentration of the deposits of the films to analyze how the electrical properties of the solar cells are affected by the thickness of each films.En este trabajo se realizó un estudio de las propiedades eléctricas de celdas solares sensibilizadas por puntos cuánticos a base de cadmio zinc azufre ( CdZnS). El objetivo es aumentar la absorción de luz en el espectro electromagnético por medio del crecimiento del material. En este trabajo, se fabricaron celdas solares sensibilizadas por puntos cuánticos con la configuración TiO2/CdS/ZnS. Se realizó una investigación experimental variando las concentraciones de los depósitos de las películas para analizar cómo las propiedades eléctricas de las celdas solares son afectas por el espesor de cada una de las películas

Diagnóstico de brucelosis de ganado bovino nativo del Norte de México con cultivo de muestras de leche, seroaglutinación con rosa de bengala y rivanol según la NOM-041-ZOO-1995 / Diagnosis of brucellosis in native cattle of Northern of Mexico with culture of milk samples, seroagglutination with rose bengal and rivanol according to the NOM-041-ZOO-1995

El objetivo de la presente investigación fue realizar el diagnóstico de brucelosis de ganado bovino nativo del Norte de México con cultivo de muestras de leche, seroaglutinación con rosa de bengala y rivanol según la NOM-041-ZOO-1995. Se seleccionó una población de 1600 bovinos hembra adultos lecheros raza Holstein-Friesian de 38 a 48 meses de edad. Cada muestra estuvo compuesta de leche extraída proveniente de todos los cuarterones, tomándose ~10 mL de leche por cada pezón. Sembradas en TSA/5% SBE y 5% CO2 atm, 37°C/21 d, subcultivos en agar Brucella y agar TSI 37°C/21 d y pruebas bioquímicas para detectar la producción de H2S y ureasa, y así confirmar la identificación de Brucella. El suero obtenido fue para procesar rosa de bengala y rivanol. Resulto un total de 460 cultivos de leche positivo a Brucella spp, de las cuales 417 (90.65%) fueron positivas a rosa de bengala y 43 (9.35%) negativas. Al procesar rivanol, fueron 338 (73.48%) positivas y 122 (26.52%). Rivanol sigue siendo buen referente para diagnóstico de brucelosis por infección, ya que permite descartar tanto muestras positivas por cultivo positivo en leche como por el diagnostico en suero con rosa de bengala

Design and Construction for Hydroxides Based Air Conditioning System with Solar Collectors for Confined Roofs

In this chapter, the methodology to determinate heat load is revised and presented. The main parameters must be fixed as function of climatization, internal thermic conditions (comfort, temperature, and humid) and the activities. According with literature, the roof structural requirements were checked. These are an important parameter because it represents the limits to the system such as load by devices (weight of equipment), orientation in solar systems (operating conditions), and building materials. The method of calculation of solar available is shown; the aim is to achieve the major collection of solar energy. Finally, the plate heat exchangers can be fabricated in gasketed, welded or module welded design characterized by the model in which the flow channels for the two heat exchanging media are sealed. The kind of exchanger is suitable depending on your requirements. The thermodynamic method of calculation of sizing the exchangers is reviewed. The aim of this section is to find the suitable devices for the operation of air-conditioning absorption system based on hydroxide

Perfusion Decellularization of Extrahepatic Bile Duct Allows Tissue-Engineered Scaffold Generation by Preserving Matrix Architecture and Cytocompatibility

Reconstruction of bile ducts damaged remains a vexing medical problem. Surgeons have few options when it comes to a long segment reconstruction of the bile duct. Biological scaffolds of decellularized biliary origin may offer an approach to support the replace of bile ducts. Our objective was to obtain an extracellular matrix scaffold derived from porcine extrahepatic bile ducts (dECM-BD) and to analyze its biological and biochemical properties. The efficiency of the tailored perfusion decellularization process was assessed through histology stainings. Results from 4’-6-diamidino-2-phenylindole (DAPI), Hematoxylin and Eosin (H&E) stainings, and deoxyribonucleic acid (DNA) quantification showed proper extracellular matrix (ECM) decellularization with an effectiveness of 98%. Immunohistochemistry results indicate an effective decrease in immunogenic marker as human leukocyte antigens (HLA-A) and Cytokeratin 7 (CK7) proteins. The ECM of the bile duct was preserved according to Masson and Herovici stainings. Data derived from scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) showed the preservation of the dECM-BD hierarchical structures. Cytotoxicity of dECM-BD was null, with cells able to infiltrate the scaffold. In this work, we standardized a decellularization method that allows one to obtain a natural bile duct scaffold with hierarchical ultrastructure preservation and adequate cytocompatibility

Sostenibilidad ambiental : biotecnología, agroecología, industria

Libro producto del Primer Congreso Nacional de Sostenibilidad Ambiental del Centro Acuícola y Agroindustrial de Gaira - SENA Magdalena en el que desde las áreas de biotecnología, agroindustria, agroecología, ambiental e industrial se presentan diferentes resultados de investigaciones.Book product of the First National Congress of Environmental Sustainability of the Aquaculture and Agroindustrial Center of Gaira - SENA Magdalena in which different research results are presented from the areas of biotechnology, agroindustry, agroecology, environment and industry.Desarrollo de alternativas para transformación de residuos orgánicos generados en plazas de mercado en Barrancabermeja -- Eficiencia eco pedagógica del Parque Educativo del Colegio Técnico Metropolitano de Barranquilla para contribuir a la solución de la problemática ambiental -- Evaluación del efecto fungicida y acaricida de extractos naturales para el control de plagas en cultivos de fresa fragaria -- Establecimiento de sistemas silvopastoriles como alternativa para mejorar la actividad ganadera -- Validación de métodos de propagación Ochroma pyramidale en el municipio de Isnos, Huila -- Caracterización de propiedades físico-mecánicas de la madera algarrobo (Hymenea coubaril) bajo diferentes condiciones de secadona113 página

Role of age and comorbidities in mortality of patients with infective endocarditis

[Purpose]: The aim of this study was to analyse the characteristics of patients with IE in three groups of age and to assess the ability of age and the Charlson Comorbidity Index (CCI) to predict mortality. [Methods]: Prospective cohort study of all patients with IE included in the GAMES Spanish database between 2008 and 2015.Patients were stratified into three age groups:<65 years,65 to 80 years,and ≥ 80 years.The area under the receiver-operating characteristic (AUROC) curve was calculated to quantify the diagnostic accuracy of the CCI to predict mortality risk. [Results]: A total of 3120 patients with IE (1327 < 65 years;1291 65-80 years;502 ≥ 80 years) were enrolled.Fever and heart failure were the most common presentations of IE, with no differences among age groups.Patients ≥80 years who underwent surgery were significantly lower compared with other age groups (14.3%,65 years; 20.5%,65-79 years; 31.3%,≥80 years). In-hospital mortality was lower in the <65-year group (20.3%,<65 years;30.1%,65-79 years;34.7%,≥80 years;p < 0.001) as well as 1-year mortality (3.2%, <65 years; 5.5%, 65-80 years;7.6%,≥80 years; p = 0.003).Independent predictors of mortality were age ≥ 80 years (hazard ratio [HR]:2.78;95% confidence interval [CI]:2.32–3.34), CCI ≥ 3 (HR:1.62; 95% CI:1.39–1.88),and non-performed surgery (HR:1.64;95% CI:11.16–1.58).When the three age groups were compared,the AUROC curve for CCI was significantly larger for patients aged <65 years(p < 0.001) for both in-hospital and 1-year mortality. [Conclusion]: There were no differences in the clinical presentation of IE between the groups. Age ≥ 80 years, high comorbidity (measured by CCI),and non-performance of surgery were independent predictors of mortality in patients with IE.CCI could help to identify those patients with IE and surgical indication who present a lower risk of in-hospital and 1-year mortality after surgery, especially in the <65-year group

Diseño para el desarrollo sustentable y la habitabilidad segura e incluyente

Este libro se divide en dos partes que permiten permear en el campo de la enseñanza del diseño; la primera se enfoca en temáticas que se desprenden del diseño en la educación para la sustentabilidad; en la segunda, se identifican las tendencias del diseño como un modo de verlo y sentirlo: va desde el diseño emocional hacia uno de conservación, reúso y reparación de objetos para reducir el consumo de recursos materiales