Synthesis of glass nanocomposite powders

The aim of the present study was to synthesize CaO·GeO2 nanocomposite poweders glasses. The sample were prepared to 1450°C°. To investigate the structure of the samples, Differential Thermal Analysis (DSC), X-ray diffraction and Fourier Transform Infrared (FTIR) spectroscopy were used. The main crystallising phase was found to be CaGe205 crystals. The molar ratio of Ge06/Ge04 groups increases with the CaO·GeO2 molar ratio. Furthermore, in order to study the potential antibacterial properties of the materials the Gram-negative (Escherichia coli) bacteria was used and the diameter of zone of inhibition was observed

Innovación, una estrategia de competitividad de las empresas colombianas en los mercados internacionales

Esta investigación fue desarrollada con el objetivo de verificar que la innovación es una herramienta valiosa para agregar valor a productos y servicios que incursionan en nuevos mercados y que compiten globalmente, según lo han demostrado compañías internacionales, que actualmente generan productos y servicios novedosos no solo en presentación, sino también en funcionalidad. Aunque no se puede afirmar, que la innovación es la única estrategia a aplicar, si se puede convertir en la mejor, pues es un factor determinante para la generación de competitividad en los paíse

Interaction of immune complexes with glomerular heparan sulfate–proteoglycans

Interaction of immune complexes with glomerular heparan sulfate–proteoglycans. The binding characteristics of cationic and more neutral immune complexes with heparan sulfate–proteoglycan enriched anionic sites of glomerular basement membrane and mesangial matrix were studied. Rat kidneys were treated either with buffers alone or buffers containing heparitinase or chondroitinase-ABC followed by perfusion with cationic or native immune complexes. Tissues were processed for immunofluorescence and transmission electron microscopy after fixation with glutaraldehyde or tannic acid glutaraldehyde. Kidneys perfused with radioiodinated immune complexes were processed for light and electron microscopic autoradiography. In addition, glomeruli from kidneys perfused with radioiodinated immune complexes were isolated and counted for radioactivity. By immunofluorescence the cationic immune complexes deposited linearly along the glomerular basement membrane. By electron microscopy, the cationic complexes localized mainly in the inner and outer layers of the glomerular basement membrane and to a certain extent in the mesangial matrix in a distribution that corresponded to previously documented anionic sites. Whereas heparitinase treatment abrogated the binding of cationic immune complexes in both glomerular basement membrane and mesangial matrix, chondroitinase-ABC treatment did not cause any decrease in binding. In contrast, more neutral immune complexes appeared to be nonspecifically trapped in the mesangium, and their distribution was unaffected by both enzymatic treatments. Light and electron microscopic autoradiography and counts of isolated glomeruli confirmed these findings. The results overall indicate that cationic immune complexes bind electrostatically to the heparan sulfate–proteoglycan enriched anionic sites of the glomerular basement membrane and mesangial matrix, while more neutral immune complexes are nonspecifically trapped in the mesangium of the renal glomerulus

Nuevo sistema de evaluación en la cátedra de cálculo II

La asignatura cálculo II corresponde al ciclo básico en las carreras de ingenierías de la UTN-FRT. Para revertir el bajo porcentaje de alumnos que regularizaba y a posteriori aprobaba la materia se implementó un nuevo sistema de evaluación. Este trabajo tiene por objetivo: “Establecer si el nuevo sistema de evaluación mejora los porcentajes de alumnos que regularizan y que posteriormente aprueban cálculo II, en las carreras de ingeniería eléctrica, electrónica y civil” Se observa que el porcentaje anual de regularizados aumenta y que el porcentaje de alumnos que aprueban se mantiene, lo que en términos absolutos significa, un aumento del número de alumnos que aprueban la materia, por lo tanto se concluye este nuevo sistema mejora el rendimiento académico

Controle da produção de aflatoxinas no amendoim em casca úmido com ortofenilfenato de sódio: III. Testes no armazém

The present experiment aimed to evaluate the effect of sodium ortho-phenylphenate (SOP) application to in-shell moist peanuts for the control of aflatoxin production. Previous studies showed the need to improve the SOP solution distribution on peanut pods to evaluate the product. Thus, in this experiment the place of the spray system was the bag filler pipe of the pre-cleaning machine in the warehouse. In the 1989 rainy season two lots of 120 bags of in-shell moist peanuts were sprayed with 0.5 and 1% SOP solutions and aflatoxin production was not controlled. In the dry season of 1989 and in the rainy season of 1990, in-shell moist peanuts were sprayed with 5% SOP solution. The coverage of pods with the solution was efficient, allowing a uniform distribution of SOP solution on the pods. The results showed that only the 5.0% concentration of SOP solution utilized controlled the external fungal growth when a naked eye observation was made, however did not control aflatoxin production when applied to in-shell moist peanuts, probably due to the internal presence of Aspergillus flavus and because the fungicide could not penetrate inside to reach the kernels.O presente trabalho teve por objetivo avaliar a eficiência da solução de ortofenilfenato de sódio (OFS), no controle da produção de aflatoxinas quando aplicada no amendoim em casca, úmido. Trabalhos anteriormente realizados, em condições de campo, indicaram a necessidade de otimizar a aplicação da solução, para se poder avaliar a real eficiência dessa substância. Assim, neste experimento, o sistema de pulverização foi adaptado na bica de saída da máquina de pré-limpeza, no armazém. Na safra das águas de 1989, dois lotes de 120 sacos de amendoim em casca úmido foram pulverizados com solução de OFS em concentrações de 0,5 e 1,0 % e verificou-se que não houve controle da produção de aflatoxinas em ambas as concentrações utilizadas. Nas safras da seca de 1989 e das águas de 1990 o amendoim em casca úmido foi pulverizado com solução de OFS na concentração de 5,0%. A cobertura das vagens com a solução foi eficiente, permitindo uma distribuição uniforme da solução de OFS sobre as vagens. Os resultados obtidos mostraram que nenhuma das concentrações utilizadas controlou a produção de aflatoxinas, quando aplicadas no amendoim em casca, embora, aparentemente, tenham controlado o crescimento fúngico da parte externa das vagens de amendoim. Provavelmente os fungos aflatoxigênicos já poderiam estar presentes dentro de vagens sadias e desse modo a casca do amendoim poderia ser uma barreira à penetração do fungicida dentro da vagem e atingir as amêndoas

Estudio del efecto de la ingesta de una sola dosis de dos inhibidores de la aromatasa sobre el perfil hormonal sexual de voluntarios sanos

Este trabajo pretende estudiar las modificaciones del perfil hormonal inducidas por el producto que contiene 1,4,6-androstatrien-3,17-diona (ATD) y 3-hidroxi-4-androsten-6,17-diona (3-OHAT), suplemento dietario utilizado por los deportistas con el fin de incrementar las concentraciones de testosterona endógena al inhibir su metabolismo y consiguiente transformación en estradiol. Aunque este producto actualmente se encuentra descontinuado en los Estados Unidos, se han detectado algunos hallazgos analíticos adversos en deportistas colombianos que evidenciaban el consumo de este producto. Para lograr nuestro objetivo, se propuso hacer un estudio de dos voluntarios hombres, evaluar su perfil hormonal antes de la ingesta y compararlo después de la misma. Además, se desarrollaron técnicas analíticas para detectar los componentes del producto mencionado.This work aims to study the hormonal profile changes induced by Attitude®, dietary supplement used by athletes to increase endogenous testosterone levels by inhibiting its metabolism and subsequent transformation into estradiol. Although this product is now discontinued in the United States, It has have detected some adverse analytical findings that revealed that Colombian athletes consume this product. To achieve our objective we performed a study of two male volunteers, to evaluate their hormonal profile before and compare after of the intake. Furthermore analytical techniques were developed to detect the components of Attitude®

Comparación de dos métodos de extracción de aceite esencial utilizando Piper Aduncum (Cordoncillo) procedente de la zona cafetera

El aceite esencial de Piper aduncum L. procedente de la zona cafetera, se extrajo de hojas y espigas utilizando las técnicas de arrastre con vapor de agua e hidrodestilación. El mejor rendimiento (2,1493%) fue obtenido por el método de hidrodestilación aplicado a las espigas del material, luego de incluir en el montaje el manejo de equipos presurizados. La determinación de la composición química del aceite utilizando cromatografía de gases acoplada a espectrometría de masas (CG/EM) mostró como componente mayoritario el apiol con proporciones entre 54,4 y 70,664%, otros compuestos en cantidades significativas fueron: germacreno-d, cariofileno y piperitona. Se realizarón pruebas fisicoquímicas de las esencias y se estudió el tiempo de extracción como variable de influencia sobre su rendimiento y composición. Las sustancias encontradas y sus respectivas cantidades en el aceite obtenido de la planta de esta región, plantean la posibilidad de sus utilización final como insecticida de acuerdo a la información recopilada sobre los estudios y usos del aceite esencial de Piper aduncum. Se realizó un cálculo preliminar del costo de producción del aceite obtenido. De acuerdo al rendimiento del aceite, tiempos de extracción, propiedades evaluadas y componentes identificados, se compararon los dos métodos de extracciónPregrad

La adopción monoparental como derecho constitucional a la familia

El objetivo general de la investigación fue: Describir en qué medida la adopción monoparental influye en disfrutar el derecho constitucional a la familia en el Perú, el tipo de investigación es básica de diseño es de teoría fundamentada, se utilizó el muestreo no probabilístico, la técnica de bola de nieve y utilizamos la técnica de la entrevista, como herramienta la guía de entrevista semi - estructurada y para poder llegar a los resultados aplicamos la triangulación de datos en los resultados, donde se concluyó que : las solicitudes de adopción por parte de familias monoparentales sufren de alguna manera un perjuicio, y se da preferencia a las familias convencionales, afectando a este grupo de familias el derecho de vivir en una familia Se recomienda primero a las autoridades administrativas y judiciales, que se tome en cuenta a todas las clases de familia incluida la familia monoparental, en todas sus decisiones que vinculen adopciones

Parasitic Infections Represent a Significant Health Threat Among Recent Immigrants in Chicago

Parasitic infections are likely under-recognized among immigrant populations in the USA. We conducted a cross-sectional study to evaluate if such infections have health impacts among recent immigrants in Chicago and to identify predictive factors for parasitic infections. A total of 133 recent immigrants were enrolled, filling out a standardized medical questionnaire and providing blood and stool samples. Appriximately 12% of subjects (15/125) who provided a blood or stool sample for testing were found to have evidence of current or prior infection with a pathogenic parasite, of which Toxocara spp. (8 subjects, 6.4%) and Strongyloides stercoralis (5 subjects, 4%) were most commonly identified. Parasitic infection was more likely among subjects who had immigrated within the previous 2 years and those with a self-reported history of worms in the stool. The most useful surrogate markers identified for parasitic infections were an elevated immunoglobulin E level (seen in 46.7% (7/15) of subjects with parasitic infections and 20% (22/110) of uninfected individuals, p = 0.04) and the presence of Blastocystis hominis cysts on Ova & Parasite exam (detected in 38.5% (5/13) of subjects with parasitic infections who provided a stool sample and 5.1% (5/98) of uninfected subjects, p = 0.002). Our study found that parasitic infections may be common in recent US immigrants, which highlights an important health disparity among a vulnerable population that merits further study. Additionally, clinical risk factors, symptoms, and laboratory findings traditionally thought to be associated with parasites were commonly found but not predictive of infection in this study population