Relación entre densidad y propiedades de tableros hdf producidos por un proceso seco.

El objetivo del trabajo fue determinar las propiedades físicas y mecánicas de tableros de fibras duros con densidades entre 810 y 1117 kg/m3. Los tableros de 3 mm de espesor fueron fabricados en un proceso seco.Se evaluaron las propiedades MOR y MOE en flexión, tracción paralela, absorción de agua, hinchamiento, hinchamiento no recuperable (springback), expansión lineal, expansión del espesor y humedad de equilibrio.La expansión lineal, la expansión del espesor y la humedad de equilibrio, se determinaron luego de climatizar a 3 humedades relativas; 40, 65 y 90% con una temperatura constante de 20 ºC.Los resultados demostraron que existe una correlación entre la densidad del tablero y las propiedades tracción paralela, MOR, MOE, absorción de agua y expansión lineal. Para el caso de los ensayos mecánicos, a medida que aumenta la densidad se incrementan las resistencias. La absorción de agua tiende a disminuir cuando la densidad del tablero aumenta. La expansión lineal se incrementa con aumentos de la densidad del tablero. El hinchamiento y la expansión del espesor no presentaron una dependencia de la densidad.The aim of the work was to determine the physical and mechanical properties of HDF-boards with densities between 810 and 1117 kg/m3. Panels of 3mm in thickness, were produced by a dry process.Bending strength (MOR and MOE), tensile strength parallel to board surface, water absorption, thickness swelling, springback, linear and thickness expansion and equilibrium moisture content were determined.Linear expansion, thickness expansion and equilibrium moisture content were meassured after climatization at 20 ºC for 3 relative humidity conditions; 40, 65 and 90%.A correlation between board density and mechanical properties, water absorption, lineal expansion was determined. With increasing panel density, higher mechanical properties and lineal expansion were obtained. Water absorption decreased when the density of the board increases. Thickness swelling and thickness expansion did not present a relationship with board density

Effect of Organic Nutrition in the Nursery Growth and Nutrimental Content of Native Avocados of Ometepec, Guerrero, Mexico

In Mexico, there are several types of wild and criollo avocados that constitute a genetic heritage of this species; these avocados currently grow in an unordered manner on farmer's lands and in backyards, and they need to be studied as they are being lost because of agricultural activities and edaphoclimatic and phytosanitary factors. On the other hand, in orchards and avocado nurseries, high amounts of chemical fertilizers and pesticides are used affecting the physicochemical and microbiological properties of the soil, modifying the flora and fauna and polluting aquifers and springs that cause health problems among consumers. Therefore, it is very important to have a more friendly agriculture with the nature. The aim of this work was to evaluate under nursery conditions, the effect of organic fertilizers on 12 genotypes (rootstocks) of native avocados of Ometepec, Guerrero, Mexico, under an experimental design of random blocks, with four treatments: T1: sheep manure,T2: Bovine manure, T3: mycorrhizae and T4 (control: water) in four replicates. The variables were: plant height (PH), stem diameter (SD), number of leaves: young (NYL) and mature (NML) per plant; and the content of NO3-, K+, Ca2+ and Na+ ions obtained by petiole extraction, and the chlorophyll content measured with SPAD, in young (CYL) and mature (CML) leaves. Additionally, an analysis of variance and Tukey mean tests (P ≤ 0.01 and 0.05) and LSD (P ≤ 0.05) were done. It was found that sheep manure was superior to other treatments in PH (76.7 cm), SD (7.2 mm), NYL (6.5 leaves/plant), NML (18.4 leaves/plant), CML (40.2 SPAD) and Ca2+(1495ppm). In conclusion, the sheep manure was better than the bovine, mycorrhiza and control (water) as it affected positively the behavior of rootstocks in plant height, stem diameter and number of young and mature leaves. In addition, organic nutrition showed no significant response in the chlorophyll content of young and mature leaves. Young leaves only reached 50% of the chlorophyll content compared to mature leaves

Hidden chromosomal abnormalities in pleuropulmonary blastomas identified by multiplex FISH

BACKGROUND: Pleuropulmonary blastoma (PPB) is a rare childhood dysontogenetic intrathoracic neoplasm associated with an unfavourable clinical behaviour. CASES PRESENTATION: We report pathological and cytogenetic findings in two cases of PPB at initial diagnosis and recurrence. Both tumors were classified as type III pneumoblastoma and histological findings were similar at diagnosis and relapse. In both cases, conventional cytogenetic techniques revealed complex numerical and structural chromosomal abnormalities. Molecular cytogenetic analysis (interphase/metaphase FISH and multicolor FISH) identified accurately chromosomal aberrations. In one case, TP53 gene deletion was detected on metaphase FISH. To date, only few cytogenetic data have been published about PPB. CONCLUSION: The PPB genetic profile remains to be established and compared to others embryonal neoplasia. Our cytogenetic data are discussed reviewing cytogenetics PPBs published cases, illustrating the contribution of multicolor FISH in order to identify pathogenetically important recurrent aberrations in PPB

BALB/c Mice Infected with Antimony Treatment Refractory Isolate of Leishmania braziliensis Present Severe Lesions due to IL-4 Production

Leishmaniasis is a neglected disease that affects more than 12 million people worldwide. In Brazil, the cutaneous disease is more prevalent with about 28,000 new cases reported each year, and L. braziliensis is the main causative agent. The interesting data about the infection with this parasite is the wide variety of clinical manifestations that ranges from single ulcerated lesions to mucocutaneous and disseminated disease. However, experimental models to study the infection with this parasite are difficult to develop due to high resistance of most mouse strains to the infection, and the mechanisms underlying the distinct manifestations remain poorly understood. Here, the authors use a mouse experimental model of infection with different L. braziliensis isolates, known to induce diseases with distinct severity in the human hosts, to elucidate immune mechanisms that may be involved in the different manifestations. They showed that distinct parasite isolates may modulate host response, and increased IL-4 production and Arg I expression was related to more severe disease, resulting in longer length of disease with larger lesions and reduced parasite clearance. These findings may be useful in the identification of immunological targets to control L. braziliensis infection and potential clinical markers of disease progression

Human cell types important for Hepatitis C Virus replication in vivo and in vitro. Old assertions and current evidence

Hepatitis C Virus (HCV) is a single stranded RNA virus which produces negative strand RNA as a replicative intermediate. We analyzed 75 RT-PCR studies that tested for negative strand HCV RNA in liver and other human tissues. 85% of the studies that investigated extrahepatic replication of HCV found one or more samples positive for replicative RNA. Studies using in situ hybridization, immunofluorescence, immunohistochemistry, and quasispecies analysis also demonstrated the presence of replicating HCV in various extrahepatic human tissues, and provide evidence that HCV replicates in macrophages, B cells, T cells, and other extrahepatic tissues. We also analyzed both short term and long term in vitro systems used to culture HCV. These systems vary in their purposes and methods, but long term culturing of HCV in B cells, T cells, and other cell types has been used to analyze replication. It is therefore now possible to study HIV-HCV co-infections and HCV replication in vitro

Cultura de investigación para la innovación y el emprendimiento

El libro se encuentra dividido en tres ejes temáticos : el primero trata temas de Investigación aplicada con dos capítulos, el segundo eje contiene los capítulos tres al seis y aborda temas de innovación en procesos con temas de software y competitividad empresarial; el eje tres innovación en servicios y en producción, del capítulo siete al doce aborda temas tan interesantes como las realidades de la internacionalización de servicios, logística hospitalaria, modelo de diagnóstico para el desarrollo socio-económico y modelo de microcréditos.The book is divided into three thematic axes: the first deals with issues of applied research with two chapters, the second axis contains chapters three to six and addresses issues of innovation in processes with issues of software and business competitiveness; axis three innovation in services and production, from chapter seven to twelve, addresses such interesting topics as the realities of the internationalization of services, hospital logistics, a diagnostic model for socio-economic development and a microcredit model.Cómo fomentar la investigación científica y la innovación empresarial desde una unidad de emprendimiento / Carlos Andres Zamudio Delgado, Johemir Pérez Pertuz -- Cambio y variabilidad cognitiva en el desarrollo de competencias financieras en niños y niñas de 7 años / Luis Guillermo Rojas Gómez -- FINEVA: el software para el análisis financiero de la internacionalización empresarial / Guillermo Rafael Angulo Vega, Lissette Salomé Ortíz Gallardo, Johel Andrés García Vargas -- Responsabilidad social del contador público desde su proceso de formación para fortalecer la gestión contable de microempresarios en la localidad de suba upz rincón Bogotá Colombia / Nadia Ávila, Ana C. Pinzón Vargas -- Competitividad e innovación en el aprendiz SENA: perspectivas de formación / René Alexander Guerrero Vergel, Ferly Antonio Valencia Serna, Elizabeth Tuberquia Vanegas -- Diseño y desarrollo de una aplicación de escritorio para la homologación contable de módulos sap systeme anwendungen und produkte / Nelson Giovanni Agudelo Cristancho, Ángela María Montoya, Juan Carlos Amezquita Tovar -- Realidades de la internacionalización de servicios en Colombia: una revisión de literatura (1994-2017) / Campo Elías López Rodríguez, Juan Carlos Ligarreto Parra, Haroldo Enrique Puerta Cabarcas -- Logística hospitalaria: caracterización de la operación de una sala de urgencias en la ciudad de Ibagué / Julián Alonso Garzón Quiroga, Jaime Alberto Villada Garcés -- Estudio de la evolución de la huella ocular como mecanismo de seguridad para las entidades financieras / Laura Valentina García Pérez, Karen Valentina Cetina Huérfano, Ashly Valeria Mercado Rojas, Ana C Pinzón Vargas -- Cómo vincular la información que brinda la contabilidad de gestión ambiental con los proyectos de emprendimiento / Daniel Isaac Roque -- Modelo diagnóstico para el desarrollo socio- productivo de la chamba en la post cosecha / Marina Casallas Silva, Jimmy Daniel Gamba Casallas, Wilson Ferney Molano -- Modelo de microcréditos para el sistema financiero / José Gerardo Vaca Lombanana232 página

Impact of COVID-19 on cardiovascular testing in the United States versus the rest of the world

Objectives: This study sought to quantify and compare the decline in volumes of cardiovascular procedures between the United States and non-US institutions during the early phase of the coronavirus disease-2019 (COVID-19) pandemic. Background: The COVID-19 pandemic has disrupted the care of many non-COVID-19 illnesses. Reductions in diagnostic cardiovascular testing around the world have led to concerns over the implications of reduced testing for cardiovascular disease (CVD) morbidity and mortality. Methods: Data were submitted to the INCAPS-COVID (International Atomic Energy Agency Non-Invasive Cardiology Protocols Study of COVID-19), a multinational registry comprising 909 institutions in 108 countries (including 155 facilities in 40 U.S. states), assessing the impact of the COVID-19 pandemic on volumes of diagnostic cardiovascular procedures. Data were obtained for April 2020 and compared with volumes of baseline procedures from March 2019. We compared laboratory characteristics, practices, and procedure volumes between U.S. and non-U.S. facilities and between U.S. geographic regions and identified factors associated with volume reduction in the United States. Results: Reductions in the volumes of procedures in the United States were similar to those in non-U.S. facilities (68% vs. 63%, respectively; p = 0.237), although U.S. facilities reported greater reductions in invasive coronary angiography (69% vs. 53%, respectively; p < 0.001). Significantly more U.S. facilities reported increased use of telehealth and patient screening measures than non-U.S. facilities, such as temperature checks, symptom screenings, and COVID-19 testing. Reductions in volumes of procedures differed between U.S. regions, with larger declines observed in the Northeast (76%) and Midwest (74%) than in the South (62%) and West (44%). Prevalence of COVID-19, staff redeployments, outpatient centers, and urban centers were associated with greater reductions in volume in U.S. facilities in a multivariable analysis. Conclusions: We observed marked reductions in U.S. cardiovascular testing in the early phase of the pandemic and significant variability between U.S. regions. The association between reductions of volumes and COVID-19 prevalence in the United States highlighted the need for proactive efforts to maintain access to cardiovascular testing in areas most affected by outbreaks of COVID-19 infection

RELACIÓN ENTRE DENSIDAD Y PROPIEDADES DE TABLEROS HDF PRODUCIDOS POR UN PROCESO SECO RELATIONSHIP BETWEEN DENSITY AND PROPERTIES OF HDF MANUFACTURED BY A DRY PROCESS

El objetivo del trabajo fue determinar las propiedades físicas y mecánicas de tableros de fibras duros con densidades entre 810 y 1117 kg/m³. Los tableros de 3 mm de espesor fueron fabricados en un proceso seco. Se evaluaron las propiedades MOR y MOE en flexión, tracción paralela, absorción de agua, hinchamiento, hinchamiento no recuperable (springback), expansión lineal, expansión del espesor y humedad de equilibrio. La expansión lineal, la expansión del espesor y la humedad de equilibrio, se determinaron luego de climatizar a 3 humedades relativas; 40, 65 y 90% con una temperatura constante de 20 ºC. Los resultados demostraron que existe una correlación entre la densidad del tablero y las propiedades tracción paralela, MOR, MOE, absorción de agua y expansión lineal. Para el caso de los ensayos mecánicos, a medida que aumenta la densidad se incrementan las resistencias. La absorción de agua tiende a disminuir cuando la densidad del tablero aumenta. La expansión lineal se incrementa con aumentos de la densidad del tablero. El hinchamiento y la expansión del espesor no presentaron una dependencia de la densidadThe aim of the work was to determine the physical and mechanical properties of HDF-boards with densities between 810 and 1117 kg/m³. Panels of 3mm in thickness, were produced by a dry process. Bending strength (MOR and MOE), tensile strength parallel to board surface, water absorption, thickness swelling, springback, linear and thickness expansion and equilibrium moisture content were determined. Linear expansion, thickness expansion and equilibrium moisture content were meassured after climatization at 20 ºC for 3 relative humidity conditions; 40, 65 and 90%. A correlation between board density and mechanical properties, water absorption, lineal expansion was determined. With increasing panel density, higher mechanical properties and lineal expansion were obtained. Water absorption decreased when the density of the board increases. Thickness swelling and thickness expansion did not present a relationship with board densit

Relación entre densidad y propiedades de tableros hdf producidos por un proceso seco.

The aim of the work was to determine the physical and mechanical properties of HDF-boards with densities between 810 and 1117 kg/m3. Panels of 3mm in thickness, were produced by a dry process.Bending strength (MOR and MOE), tensile strength parallel to board surface, water absorption, thickness swelling, springback, linear and thickness expansion and equilibrium moisture content were determined.Linear expansion, thickness expansion and equilibrium moisture content were meassured after climatization at 20 ºC for 3 relative humidity conditions; 40, 65 and 90%.A correlation between board density and mechanical properties, water absorption, lineal expansion was determined. With increasing panel density, higher mechanical properties and lineal expansion were obtained. Water absorption decreased when the density of the board increases. Thickness swelling and thickness expansion did not present a relationship with board density.El objetivo del trabajo fue determinar las propiedades físicas y mecánicas de tableros de fibras duros con densidades entre 810 y 1117 kg/m3. Los tableros de 3 mm de espesor fueron fabricados en un proceso seco.Se evaluaron las propiedades MOR y MOE en flexión, tracción paralela, absorción de agua, hinchamiento, hinchamiento no recuperable (springback), expansión lineal, expansión del espesor y humedad de equilibrio.La expansión lineal, la expansión del espesor y la humedad de equilibrio, se determinaron luego de climatizar a 3 humedades relativas; 40, 65 y 90% con una temperatura constante de 20 ºC.Los resultados demostraron que existe una correlación entre la densidad del tablero y las propiedades tracción paralela, MOR, MOE, absorción de agua y expansión lineal. Para el caso de los ensayos mecánicos, a medida que aumenta la densidad se incrementan las resistencias. La absorción de agua tiende a disminuir cuando la densidad del tablero aumenta. La expansión lineal se incrementa con aumentos de la densidad del tablero. El hinchamiento y la expansión del espesor no presentaron una dependencia de la densidad