Pesquisa | SciELO

Resumen El accidente cerebrovascular (ACV) constituye la principal causa de discapacidad de origen neuro- lógico en los adultos mayores a 40 años y la cuarta causa de muerte en Argentina. En los últimos diez años las publicaciones indexadas relacionadas al tratamiento del ACV isquémico fueron más numerosas que las de ACV hemorrágico. El objetivo de este material es proporcionar recomendaciones locales y actualiza- das del abordaje de pacientes con hematoma intraparenquimatoso espontáneo durante la internación. Para la redacción de este manuscrito se convocó a especialistas en esta enfermedad que conformaron grupos de trabajo. Se plantearon 10 tópicos centrales expresados como epidemiologia, atención inicial, imágenes, tratamiento de la presión arterial, reversión de antitrombóticos, indicación de cirugía, profilaxis anticonvulsivante, pronóstico, prevención de complicaciones y reinicio de antitrombóticos. De cada tópico se plantearon mediante preguntas PICO los interrogantes más frecuentes de la práctica diaria. Luego de una revisión sistemática de la literatura, se generaron recomendaciones evaluadas mediante sistema GRADE y consensuadas entre autores y pacientes.

Abstract Stroke is the leading cause of neurological disability in people over 40 years of age and the fourth leading cause of death in Argentina. In the last ten years, the indexed publications related to the treatment of ischemic stroke were more numerous than those of hemorrhagic stroke. The objective of this material is to provide local and updated recommendations for the management of patients with spontaneous intracere- bral hemorrhage during hospitalization. For the writing of this manuscript, diferent specialists were convened to form working groups. Ten central topics expressed as epidemiology, initial care, imaging, blood pressure treatment, reversal of antithrombotics, indication for surgery, seizure prophylaxis, prognosis, prevention of complications and resumption of antithrombotics were raised. For each topic, the most frequent questions of daily practice were raised through PICO questions. After a systematic review of the literature, recommendations were generated, evaluated using the GRADE system and agreed between authors and patients.

Splitting the Total Dose of Cyclophosphamide in Two Blocks Apart during the Conditioning of Autologous Hematopoietic Stem Cell Transplantation in Multiple Sclerosis Results in Diminished Cardiotoxicity: Experience in 1,000 Patients
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Olivares-Gazca, Juan Carlos

; Guerrero-Pesqueira, Francisco

; Murrieta-Alvarez, Iván

; Cantero-Fortiz, Yahveth

; León-Peña, Andrés A.

; Priesca-Marín, José M.

; Gomez-Almaguer, David

; Gomez-De-Leon, Andrés

; Ruiz-Delgado, Guillermo J.

; Ruiz-Argüelles, Guillermo J.

Revista de investigación clínica

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Fev 2022, Volume 74 Nº 1 Páginas 1 - 3

Resumo: En | Texto: En | PDF: En

https://doi.org/10.24875/ric.21000206 9 downloads

Relationship between optic disc hemorrhage and glaucoma among patients diagnosed with systemic hypertension and Diabetes Mellitus: the Colombian Glaucoma Study
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Rivera, Carlos Eduardo

; Ferreria, Maria Catalina

; Libreros-Peña, Laura

; Shah, M. Ahsan

; Aristizabal, Juan Carlos

; Muñoz, Edgar

; Gomez-Duarte, Catalina

; Ossa-Lopez, Beatriz Eugenia

; Burbano-Montenegro, Gabriel

; Seth, Ankur

Iberoamerican Journal of Medicine

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2022, Volume 4 Nº 4 Páginas 220 - 228

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Abstract Introduction: Glaucoma is a leading cause of irreversible blindness worldwide; several risk factors have been identified as major underlying causes for developing this condition. Optic disc hemorrhage has been identified as a risk factor for the development and progression of primary open-angle glaucoma, as well it has been related to playing an important role in normal-tension glaucoma. Material and methods: A cross-sectional study was conducted in Colombia among hypertensive and diabetic patients. This study included 2,067 subjects older than 50 years who were attended by a group of ophthalmologists in six cities in Colombia who conducted a complete medical and ophthalmological examination and applied standardized questionnaires and interviews aiming to evaluate participant’s health conditions and lifestyles. Results: We found a prevalence of Optic disc hemorrhage (ODH) of 0.4%. ODH presented an OR: 8.82 (95% CI 1.60 - 48.52) for the presence of Glaucoma. Patients diagnosed with systemic hypertension had an OR: 0.02 (95% CI 0.00 - 0.96); Patients with Retinal Nerve Fiber Layer Defect (RNFL) presented an OR: 509.40 (95% CI 8.60 - 30152.97) for the presence of ODH and 50% of patients with ODH did not have a diagnosis of glaucoma. Conclusions: Despite the low prevalence of ODH in our study (0.4%), its presence is a High-risk factor for the presence of Glaucoma. RNFL defect is also highly related to ODH and the presence of Glaucoma.

Resumen Introducción: El glaucoma es una de las principales causas de ceguera irreversible a nivel mundial; varios factores de riesgo han sido identificados como las principales causas subyacentes para el desarrollo de esta condición. La hemorragia del disco óptico se ha identificado como un factor de riesgo para el desarrollo y progresión del glaucoma primario de ángulo abierto, así como también se ha relacionado con desempeñar un papel importante en el glaucoma de tensión normal. Material y métodos: Se realizó un estudio transversal en Colombia entre pacientes hipertensos y diabéticos. Este estudio incluyó a 2.067 sujetos mayores de 50 años que fueron atendidos por un grupo de oftalmólogos en seis ciudades de Colombia, quienes realizaron un examen médico y oftalmológico completo y aplicaron cuestionarios y entrevistas estandarizados con el fin de evaluar las condiciones de salud y estilos de vida de los participantes. Resultados: Encontramos una prevalencia de hemorragia del disco óptico (HDO) del 0,4%. ODH presentó un OR: 8,82 (IC 95% 1,60 - 48,52) para la presencia de Glaucoma. Los pacientes diagnosticados de hipertensión sistémica tuvieron OR: 0,02 (IC 95% 0,00 - 0,96); Los pacientes con Defecto de la Capa de Fibras Nerviosas de la Retina (RNFL) presentaron un OR: 509,40 (IC 95% 8,60 - 30152,97) para la presencia de ODH y el 50% de los pacientes con ODH no tenían diagnóstico de glaucoma. Conclusiones: A pesar de la baja prevalencia de HDO en nuestro estudio (0,4%), su presencia es un factor de alto riesgo para la presencia de Glaucoma. El defecto de la RNFL también está muy relacionado con la ODH y la presencia de glaucoma.

https://doi.org/10.53986/ibjm.2022.0040

Characteristics and Surgical Outcomes in Very Elderly Patients (≥75 years) with Renal Cell Carcinoma: Data from the Latin American Renal Cancer Group
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Garza-Gangemi, Adrián M.

; Castillejos-Molina, Ricardo A.

; Gueglio, Guillermo

; Tobia-Gonzalez, Ignacio P.

; Jurado, Alberto M.

; Meza-Montoya, Luis

; Scorticati, Carlos H.

; Henriques-da-Costa, Walter

; Yandian, Juan

; Ubillos, Luis

; Glina, Sidney

; Tobias-Machado, Marcos

; Rodríguez-Faba, Oscar

; Ameri, Carlos

; Nolazco, Alejandro

; Martinez, Pablo

; Franco Carvalhal, Gustavo

; Bengio, Ruben G.

; Arribillaga, Leandro Cristian

; Langenhin, Raúl

; Muguruza, Diego

; Campos-Salcedo, José G.

; Bravo-Castro, Edgar I.

; Mingote, Pablo A.

; Ginestar, Nicolás

; Autran-Gomez, Ana M.

; Puente, Roberto

; Decia, Ricardo

; Cardoso-Guimarães, Gustavo

; Palou-Redorta, Joan

; Abreu-Clavijo, Diego

; Cassio-Zequi, Stenio de

; Rodriguez-Covarrubias, Francisco T.

Revista de investigación clínica

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Out 2020, Volume 72 Nº 5 Páginas 308 - 315

Resumo: En | Texto: En | PDF: En

Background: The incidence of renal cell carcinoma (RCC) is increasing globally due to an aging population and widespread use of imaging studies. Objective: The aim of this study was to describe the characteristics and perioperative outcomes of RCC surgery in very elderly patients (VEP), ≥ 75 years of age. Methods: This is a retrospective comparative study of 3656 patients who underwent the treatment for RCC from 1990 to 2015 in 28 centers from eight Latin American countries. We compared baseline characteristics as well as clinical and perioperative outcomes according to age groups (<75 vs. ≥75 years). Surgical complications were classified with the Clavien-Dindo score. We performed logistic regression analysis to identify factors associated with perioperative complications. Results: There were 410 VEP patients (11.2%). On bivariate analysis, VEP had a lower body mass index (p < 0.01) and higher ASA score (ASA >2 in 26.3% vs. 12.4%, p < 0.01). There was no difference in performance status and clinical stage between the study groups. There were no differences in surgical margins, estimated blood loss (EBL), complication, and mortality rates (1.3% vs. 0.4%, p = 0.17). On multivariate regression analysis, age ≥75 years (odds ratio [OR] 2.33, p < 0.01), EBL ≥ 500 cc (OR 3.34, p < 0.01), and > pT2 stage (OR 1.63, p = 0.04) were independently associated with perioperative complications. Conclusions: Surgical resection of RCC was safe and successful in VEP. Age ≥75 years was independently associated with 30-day perioperative complications. However, the vast majority were low-grade complications. Age alone should not guide decision-making in these patients, and treatment must be tailored according to performance status and severity of comorbidities. (REV INVEST CLIN. 2020;72(5):308-15)

https://doi.org/10.24875/ric.20000018 141 downloads

REMEDIACIÓN ELECTROCINÉTICA DE UN SUELO REAL CONTAMINADO CON PLOMO ASISTIDA CON LA ADICIÓN DE UN AGENTE COMPLEJANTE
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Villen-Guzman, Maria

; Cerrillo-Gonzalez, Maria del Mar

; Paz-Garcia, Juan M.

; Vereda-Alonso, Carlos

; Gomez-Lahoz, Cesar

; Rodriguez-Maroto, Jose M.

Química Nova

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Set 2020, Volume 43 Nº 8 Páginas 1078 - 1085

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

The use of ethylenediaminetetraacetic acid disodium salt (Na2EDTA) as a chelating agent presents ideal characteristics to be used for the removal of lead from a contaminated site. Batch experiments together with a simple local equilibrium model were carried out to evaluate the role of EDTA as enhancing agent in electrokinetic remediation of a Pb-contaminated soil. According to preliminary results, Pb removal was close to 85% after 9 hours. Hence, electrokinetic experiments were designed implementing a pH control system at both electrode-compartments. From first experiments, no important Pb recovery was obtained probably due to the counteracting effect of the electroosmotic and electromigration movement of Pb-species. The use of an iron anode instead of a platinum anode involved the recovery of a high percentage of Pb (80%) at the cathode. These results were associated with the behavior of the iron as a sacrificial anode. Furthermore, the formation of Fe(EDTA)- hinders the formation of Pb(EDTA)2-, which entails the dissolution of the contaminant as Pb2+. Therefore, the Pb species are transported toward the cathode by electromigration and electroosmosis. Furthermore, the competition between the oxidation of iron and the water electrolysis entailed a lower consumption of NaOH to control pH value at the anode compartment.

https://doi.org/10.21577/0100-4042.20170585 1700 downloads

A nationwide study on the prevalence of functional gastrointestinal disorders in school-children
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Saps, Miguel

; Moreno-Gomez, Jairo Enrique

; Ramírez-Hernández, Carmen Rossy

; Rosen, John M.

; Velasco-Benitez, Carlos A.

Boletín médico del Hospital Infantil de México

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Dez 2017, Volume 74 Nº 6 Páginas 407 - 412

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Abstract: Introduction: Functional gastrointestinal disorders (FGIDs) are highly prevalent worldwide and are thought to result from the interplay of multiple factors that can vary from region to region. Nationwide studies can help understand the regional epidemiology and the pathogenesis of FGIDs. The objectives of this study were to determine the prevalence of FGIDs in school-children of Colombia and assess associated factors. Methods: A cross-sectional study was carried out at twelve private and public schools in ten cities distributed through the four main geographic regions of Colombia. School-children completed a validated questionnaire to assess functional gastrointestinal disorders according to Rome III criteria. Demographic information and past medical and family history was obtained from the parents. Results: A total of 4394/5062 (86.8%) children participated in the study, with ages ranging from 8-18 years (mean = 11.9, SD = 2.3). The percentage of children with al least on FGID was 23.7%. Disorders of defecation were the most common category FGID (11.7%) followed by abdominal pain related-functional gastrointestinal disorders (10.4%). Children have increased odds of FGIDs if they have separated parents (OR 1.22, P=0.007), attend private school (OR 1.54, P<0.001), or have nausea (OR 3.16, P<0.001). Conclusions: This large epidemiological study of pediatric FGIDs is the first to evaluate a broad cross-section of children throughout a nation in the Americas. High prevalence of FGIDs and identified associations with their likelihood are relevant when providing medical care and when planning public health efforts.

Resumen: Introducción: Los desórdenes gastrointestinales funcionales (DGF) son altamente prevalentes a nivel mundial. Se postula que estos desórdenes resultan del interjuego de múltiples factores que pueden variar regionalmente. Estudios a nivel nacional pueden ayudar a comprender la epidemiología regional y la patogénesis de los DGFs. Los objetivos del estudio fueron determinar la prevalencia de DGFs en escolares en Colombia y establecer los factores asociados. Métodos: Estudio de corte transversal realizado en 12 escuelas privadas y públicas en 10 ciudades de las cuatro regiones principales de Colombia. Niños de edad escolar completaron un cuestionario validado para diagnosticar DGFs de acuerdo con los criterios de Roma III. Información demográfica e historia personal y familiar fue obtenida de los padres. Resultados: Un total de 4394/5062 (86.8%) niños participaron en el estudio, rango de edad 8-18 años (promedio = 11.9, desviación estándar (DE) = 2.3). El 23.7% de los niños tuvieron al menos un DGF. Los desórdenes de la defecación fueron los más frecuentes (11.7%), seguidos por desórdenes funcionales de dolor (10.4%). Niños cuyos padres estaban separados (razón de momios (RM) 1.22, p= 0.007), cursaban en escuela privada (RM 1.54, p< 0.001) o reportaban náuseas (RM 3.16, p< 0.001) tuvieron mayor riesgo de DGFs. Conclusiones: Este estudio de DGF es el primero en evaluar un grupo numeroso de niños en diferentes regiones de un país americano. La alta prevalencia de DGFs y la identificación de asociaciones que aumentan el riesgo de desarrollar estos desórdenes son hallazgos relevantes para proveer cuidados médicos y planear estrategias de salud pública.

https://doi.org/10.1016/j.bmhimx.2017.05.005 390 downloads

MS INTA 416: A new Argentinean wheat cultivar carrying Fhb1 and Lr47 resistance genes
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Bainotti, Carlos T.

; Lewis, Silvina

; Campos, Pablo

; Alberione, Enrique

; Salines, Nicolás

; Gomez, Dionisio

; Fraschina, Jorge

; Salines, José

; Formica, María B.

; Donaire, Guillermo

; Vanzetti, Leonardo S.

; Lombardo, Lucio

; Nisi, María M.

; Cuniberti, Martha B.

; Mir, Leticia

; Conde, María B.

; Helguera, Marcelo

Crop Breeding and Applied Biotechnology

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Set 2017, Volume 17 Nº 3 Páginas 280 - 286

Resumo: En | Texto: En | PDF: En

Abstract MS INTA 416 is a hard red winter wheat selected for high yield potential and good bread-making quality, combined with moderate resistance to Fusarium-head-blight and high resistance to leaf-rust, due mainly to presence of resistance genes Fhb1 and Lr47. MS INTA 416 is adapted to main production areas of Central-Argentina.

https://doi.org/10.1590/1984-70332017v17n3c42 1007 downloads

Spatial distribution pattern of Mytilus chilensis beds in the Reloncaví fjord: hypothesis on associated processes
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Molinet Flores, Carlos Alberto

; Díaz Gomez, Manuel Alejandro

; Arriagada Muñoz, Camilo Bernardo

; Cares Pérez, Leny Eunise

; Marín Arribas, Sandra Lorena

; Astorga Opazo, Marcela Patricia

; Niklitschek Huaquin, Edwin Juan Elías

Revista chilena de historia natural

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2015, Volume 88 Páginas 1 - 12

Resumo: En | Texto: En | PDF: En

BACKGROUND: Natural M. chilensis populations dominate habitats with a steep environmental gradient, and that are characterized by abrupt changes in salinity and exposure to desiccation. Although these populations are the source of seed supplies for the Chilean mussel culture industry (annual production around 250 thousand Tons), knowledge about natural populations is scarce. Based on video transect recordings, this study carries out research into one of the principal mussel beds and its associated epibenthic community in the Reloncaví Fjord, both along cross-shore and along-shore distribution gradients RESULTS: Mytiluschilensis was observed between the middle intertidal zone and the upper subtidal zone (between approximately 9 and 26 psu), with a richer associated community towards the subtidal zone and the fjord mouth. The mussel Condition Index (total meat weight/shell length*100) in the intertidal zone was significantly greater than in the subtidal zone, which raises questions about the reproductive contribution of mussels along the intertidal mid-subtidal gradient CONCLUSIONS: Salinity and tidal variations, together with biological interactions, would seem to be key factors for explaining M. chilensis spatial distribution in the Reloncaví fjord, where beds appear to be in a contraction stage, as evidenced by M. chilensis scarcity towards the subtidal zone. The importance of these populations and their persistence in environments with high perturbation frequency, suggests a monitoring program should be implemented that considers both population spatial distribution and the changing environmental conditions.

https://doi.org/10.1186/S40693-015-0041-7 1366 downloads

Associations between time spent traveling in motor vehicles and physical activity in Colombian adults from urban areas
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Paez, Diana C.

; Gomez, Luis F.

; Mallarino, Christina

; Arango, Carlos M.

; Flórez, Alberto

; Nylander, Andrew

; Parra, Diana C.

Cadernos de Saúde Pública

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Nov 2014, Volume 30 Nº 11 Páginas 2320 - 2330

Resumo: Pt En Es | Texto: Pt En Es | PDF: Pt | PDF: En | PDF: Es

Comportamentos sedentários estão associados com menos atividade física. Pouca evidência existe sobre esta associação relacionada ao tempo de viagem na América Latina. Este estudo analisou a associação entre o tempo gasto viajando em veículos a motor e os níveis de atividade física, nos domínios e atividade física de lazer e transporte entre adultos Colombianos em áreas urbanas. Uma análise secundária da Pesquisa Nacional de Nutrição de 2010 foi realizada. O tempo gasto viajando em veículos a motor e atividade física foram avaliados utilizando Questionário Internacional de Atividade Física. Regressões logísticas binárias foram realizados. O tempo gasto viajando em veículos a motor por 120 minutos ou mais foi relatado em 27,6% da amostra. A prevalência de caminhar ou andar de bicicleta para o transporte de pelo menos 150 minutos por semana foi de 34,0% e 4,4%, respectivamente. Alcançar pelo menos 150 minutos de atividade física de lazer em uma semana foi relatado em 18,4% da amostra. Este estudo sugere associações negativas entre tempo gasto viajando em veículos a motor e transporte ativo, com associações significativas de tendências na análise estratificada. Não houve diferenças significativas encontradas entre tempo gasto viajando em veículos a motor e atividade física de lazer.

Sedentary behaviors are associated with less physical activity. Little evidence exists about this association and its relation with commuting time in Latin America. This study examined the association between time spent traveling in motor vehicles and physical activity levels in the domains of leisure time physical activity and transportation, among Colombian adults in urban areas. A secondary data analysis of the 2010 National Nutrition Survey was conducted. Time spent traveling in motor vehicles and physical activity were assessed using the International Physical Activity Questionnaire. Binary logistic regressions were conducted. Time spent traveling in motor vehicles for 120 minutes or more was reported among 27.6% of the sample. The prevalence of walking and bicycling as a means of transportation for at least 150 minutes per week was 34% and 4.4%, respectively. Achieving at least 150 minutes of leisure time physical activity a week was reported by 18.4% of the sample. This study suggests negative associations between time spent traveling in motor vehicles and active transport, with significant trend associations in stratified analyses. No significant associations were found between time spent traveling in motor vehicles and leisure time physical activity.

Comportamientos sedentarios se asocian con una menor actividad física. Existen pocas evidencias sobre esta asociación en relación con el tiempo de viaje en América latina. Se examinó la asociación entre el tiempo de viaje en vehículos motorizados y los niveles de actividad física en los dominios de actividad física en el tiempo libre y transporte, en adultos colombianos de zonas urbanas. Se realizó un análisis de datos secundarios de la Encuesta Nacional de Nutrición de 2010. El tiempo de viaje en vehículos motorizados y actividad física se evaluó a través del Cuestionario Internacional de Actividad Física. Se llevaron a cabo regresiones logísticas binarias. Tiempo de viaje en vehículos motorizados durante 120 minutos o más, fue reportado por el 27,6% de la muestra. La prevalencia de caminar y montar en bicicleta como medio de transporte fue de 34% y 4,4%, respectivamente. Realizar por lo menos 150 minutos a la semana de actividad física en el tiempo libre fue reportado por el 18,4% de la muestra. Este estudio sugiere asociaciones negativas entre tiempo de viaje en vehículos motorizados y transporte activo, con tendencias significativas en análisis estratificados. No hubo diferencias significativas entre tiempo de viaje en vehículos motorizados y actividad física en el tiempo libre.

https://doi.org/10.1590/0102-311X00197513 1555 downloads

10.

Associations between time spent traveling in motor vehicles and physical activity in Colombian adults from urban areas
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Paez, Diana C.

; Gomez, Luis F.

; Mallarino, Christina

; Arango, Carlos M.

; Flórez, Alberto

; Nylander, Andrew

; Parra, Diana C.

Cadernos de Saúde Pública

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Nov 2014, Volume 30 Nº 11 Páginas 2320 - 2330

Resumo: Pt En Es | Texto: Pt En Es | PDF: Pt | PDF: En | PDF: Es

https://doi.org/10.1590/0102-311X00197513 903 downloads

11.

Nuevos registros de Odonata y Ephemeroptera para el noroeste de Argentina
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Rodríguez, José S.

; Gomez, Daniela

; Molineri, Carlos

Revista de la Sociedad Entomológica Argentina

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Jun 2014, Volume 73 Nº 1-2 Páginas 85 - 88

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

We provide new records for 14 species of Odonata and two species of Ephemeroptera including two new records for Argentina: Nephepeltia leonardina Rácenis (Anisoptera: Libellulidae) and Alloretochus peruanicus (Soldán) (Ephemeroptera: Caenidae). The distributions of Aphylla theodorina (Navás) (Anisoptera: Gomphidae) and Caenis tenella (Navás) (Ephemeroptera: Caenidae) are extended to the Yungas (both previously known for the NE of Argentina). New records are also included for: Neoneura confundens Wasscher & Van't Bosch (Coenagrionidae); Anax amazili (Burmeister) (Aeshnidae); Brachymesia furcata (Hagen), Erythemis plebeja (Burmeister), Erythrodiplax melanorubra Borror, E. nigricans (Rambur), Macrothemis imitans imitans Karsch, M. musiva Calvert, Miathyria marcella (Selys) and Micrathyria hesperis Ris (Libellulidae); Progomphus complicatus Selys and Progomphus joergenseni Ris (Gomphidae).

Se presentan nuevos registros de 14 especies de Odonata y dos especies de Ephemeroptera, incluyendo dos registros nuevos de Argentina: Nephepeltia leonardina Rácenis (Anisoptera: Libellulidae) y Alloretochus peruanicus (Soldán) (Ephemeroptera: Caenidae). Las distribuciones de Aphylla theodorina (Navás) (Anisoptera: Gomphidae) y Caenis tenella (Navás) (Ephemeroptera: Caenidae) se extienden hasta las Yungas (ambas previamente conocidas para el NE de Argentina). También se presentan nuevos registros geográficos de: Neoneura confundens Wasscher & Van't Bosch (Coenagrionidae); Anax amazili (Burmeister) (Aeshnidae); Brachymesia furcata (Hagen), Erythemis plebeja (Burmeister), Erythrodiplax melanorubra Borror, E. nigricans (Rambur), Macrothemis imitans imitans Karsch, M. musiva Calvert, Miathyria marcella (Selys) y Micrathyria hesperis Ris (Libellulidae); Progomphus complicatus Selys y Progomphus joergenseni Ris (Gomphidae).

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12.

Propiedades estructurales, ópticas y eléctricas de películas de SnO<bold>2</bold> y SnO<bold>2</bold>:F depositadas por rocío pirolítico ultrasónico
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Flores-Carrasco, G.

; Alcántara-Iniesta, S.

; Sierra-Fernández, A.

; Gomez-Villalba, L.S.

; Rabanal, M.E.

; Milosevic, O.

Superficies y vacío

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2014, Volume 27 Nº 4 Páginas 126 - 132

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

In this research, we report the preparation and characterization of SnO2 thin films preparation by the Ultrasonic Spray Pyrolysis technique using different fluorine content dissolved in ethanol as precursor solution, for its possible application as TCO´s. The structural, optical and electric properties of synthesized SnO2:F films have been characterized by X-ray Diffraction (XRD), Profilometer, UV-Vis-NIR spectroscopy and electrical measurements by Hall Effect. Also structural changes were studied by X-ray diffraction. The main results show that the electrical resistivity of the films decreased with the fluorine content. The best electro-optical properties (electrical resistivity of 4.14x10−4 Ω-cm and average transmittance of 80 %) were achieved in a fluorine content in relative with tin of about 0.52. Furthermore, a systematic change was observed in the intensity of the lines of the diffraction maxima of X-rays in function of fluorine content.

En esta investigación, reportamos la preparación y caracterización de películas delgadas de SnO2 preparadas por la técnica de Rocío Pirolítico Ultrasónico con diferente contenido de flúor disuelto en etanol como solución precursora, para su posible aplicación como TCO´s. Las propiedades estructurales, ópticas y eléctricas de películas SnO2:F sintetizadas se caracterizaron mediante Difracción de Rayos-X (DRX), Perfilometria, Espectroscopia UV-Vis-NIR y mediciones eléctricas por Efecto Hall. Asimismo los cambios estructurales se estudiaron mediante Difracción de Rayos-X. Los principales resultados muestran que la resistividad eléctrica de las películas disminuyó con el contenido de flúor. Las mejores propiedades electro-ópticas (resistividad eléctrica de 4.14x10-4 Ω-cm y transmitancia media de 80 %) se alcanzaron en un contenido de flúor con relación de estaño de aproximadamente 0.52. Además, se observó un cambio sistemático en la intensidad de las líneas de los máximos de difracción de rayos-X en función del contenido de flúor.

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13.

Edge Detection Algorithm Based on Fuzzy Logic Theory for a Local Vision System of Robocup Humanoid League
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Perez-Hernandez, Andrea K.

; Gomez-García, Andrés

; Rojas-Martínez, Eyberth R.

; Rodríguez-Rojas, Carlos S.

; López-Jiménez, Jorge

; Calderón-Chavez, Juan M.

TecnoLógicas

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Jun 2013, Nº 30 Páginas 33 - 50

Resumo: Es En | Texto: Es En | PDF: Es | PDF: En

Este artículo presenta el desarrollo de un algoritmo para la extracción de bordes basado en la teoría de lógica difusa, mediante el cual es posible reconocer las marcas de un campo de juego para la liga humanoide de RoboCup. El algoritmo propuesto describe la creación de un sistema de inferencia difuso que permite evaluar la relación existente entre los pixeles de una imagen, encontrando así las variaciones en los niveles de gris para una vecindad de pixeles específica. Posteriormente se plantea la implementación del método OTSU para binarizar la imagen obtenida en el proceso difuso y así generar una imagen que contiene solo los bordes extraídos, validando el algoritmo en imágenes de la liga humanoide. Luego se analizan los resultados obtenidos evidenciando el buen desempeño del algoritmo, considerando que el tiempo de procesamiento de la propuesta es tan solo el 35% más del tiempo necesario en métodos tradicionales, mientras que los bordes extraídos son unos 52% menos susceptibles al ruido.

At this paper we shown the development of an algorithm to perform edges extraction based on fuzzy logic theory. This method allows recognizing landmarks on the game field for Humanoid League of RoboCup. The proposed algorithm describes the creation of a fuzzy inference system that permit evaluate the existent relationship between image pixels, finding variations on grey levels of related neighbor pixels. Subsequently, it shows an implementation of OTSU method to binarize an image that was obtained from fuzzy process and so generate an image containing only extracted edges, validating the algorithm with Humanoid League images. Later, we analyze obtained results that evidence a good performance of algorithm, considering that this proposal only takes an extra 35% processing time that will be required by traditional methods, whereas extracted edges are 52% less noise susceptible.

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14.

THREE-FIBER OPTICAL PROBE FOR STUDYING FLUIDIZED GAS-SOLID BEDS IN BUBBLING REGIME
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REYES-VERA, ERICK

; DOMINGUEZ-GOMEZ, D. M.

; CAUSADO-BUELVAS, JESÚS D.

; TORRES, PEDRO

; MORENO, YOLICE

; LONDOÑO, CARLOS

; MOLINA, ALEJANDRO

DYNA

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Abr 2011, Volume 78 Nº 166 Páginas 55 - 59

Resumo: Es En | Texto: Es En | PDF: Es | PDF: En

En este trabajo se muestra el desarrollo de una sonda con tres fibras ópticas para estudiar el comportamiento de la burbuja en lechos gas-sólido fluidizados burbujeantes. Su estructura compacta permite minimizar las perturbaciones inducidas al campo del flujo, lográndose resultados más exactos frentes a otros tipos de sonda. Los lechos fluidizados burbujeantes son ampliamente usados en procesos petroquímicos, metalúrgicos y en termoeléctricas. El comportamiento de la burbuja es uno de los parámetros más importantes para la simulación y diseño de reactores termoeléctricos, dado que se relaciona con los saltos de fase, la interacción entre las fases sólida y gaseosa del lecho y el comportamiento de la transferencia de masa. Conocer tanto la velocidad como el tamaño de burbuja, ayudan a caracterizar estos sistemas, llevando un mejor diseño de reactores a gran escala.

This work shows the development of a three-optical fiber probe to study the behavior of the bubble in bubbling fluidized gas-solid beds. Its compact design allows minimizing disturbance to the flow field, resulting in more accurate results than other probes. Bubbling fluidized beds are widely used in petrochemical processes, metallurgical, and thermoelectric plants. The behavior of the bubble is one of the most important parameters for the simulation and design of thermoelectric reactors, as it relates to the jumping phase, the interaction between solid and gaseous phases of the bed, and the behavior of mass transfer. Knowing both the speed and the size of the bubble helps to characterize these systems, bringing about a better design of large-scale reactors.

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15.

Ascorbic acid biosynthesis: a precursor study on plants
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Barata-Soares, Anderson D.

; Gomez, Maria Luiza P. A.

; Mesquita, Carlos Henrique de

; Lajolo, Franco M.

Brazilian Journal of Plant Physiology

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Dez 2004, Volume 16 Nº 3 Páginas 147 - 154

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Apesar da importância do ácido ascórbico (AA) para os organismos animais e vegetal, sua biossíntese somente foi elucidada em 1998, quando Wheeler, Jones e Smirnoff demonstraram, em folhas de Arabidopsis, que L-galactose (L-GAL) é um precursor chave. Neste trabalho, investigou-se a atuação de supostos precursores na síntese do AA em diferentes fontes vegetais: pimentão-verde, goiabas de polpa branca e vermelha, mamão e morango em dois estádios do amadurecimento: verde e maduro para o mamão e verde e rosa para o morango e em brócolis, verificando-se a atuação da via "Smirnoff-Wheeler" mediante a constatação do aumento dos conteúdos de AA e incorporação de precursores radiativamente marcados. O conteúdo de AA no mamão maduro apresentou-se maior do que no verde, indicando que há predomínio da síntese durante o amadurecimento desse fruto. O mesmo não ocorreu com o morango, onde não houve diferenças significativas entre os conteúdos de AA nos frutos verde e intermediário. Os resultados confirmaram que a L-GAL e a L-galactono-1,4-lactona (L-GL) são precursores bastante eficientes do AA, e também que há síntese de AA a partir de D-manose (D-MAN), L-GAL e D-glicose-1P nos vegetais estudados.

Since the first isolation of ascorbic acid (AsA) in 1928, few papers have been published regarding the biosynthesis of AsA in plants, especially in fruits. It took as long as 1998, before Wheeler, Jones and Smirnoff, based on a study with Arabidopsis leaves, proposed what can be considered the main pathway of biosynthesis of AsA, in which L-galactose (L-GAL) is a key precursor. This paper reports the effectiveness of some precursors (cold or radiolabeled) in the biosynthesis of AsA in different plants: green sweet pepper, white-pulp guava, red-pulp guava, papaya and strawberry at two ripening stages (mature green and ripe for papaya and mature green and half red for strawberry) and broccoli. The 'Smirnoff-Wheeler' pathway was functioning and active in all sources studied, as demonstrated by the increase in AsA contents and incorporation of labeled precursors into AsA. In papaya, the AsA content in the ripe fruit was higher than in the mature green, indicating the synthesis of AsA during ripening. On the other hand, the AsA content in the mature green strawberry was similar to that of the half red fruits. Our data demonstrate that L-GAL and L-Galactono-1,4-lactone (L-GL) are effective precursors for the biosynthesis of AsA in fruits and also provided additional evidence for the participation of D-mannose (D-MAN) and D-glucose-1P in the biosynthesis of AsA in plants.

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