oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 4 )

2019 ( 250 )

2018 ( 261 )

2017 ( 229 )

Custom range...

Search Results: 1 - 10 of 113190 matches for " Espinoza O "
All listed articles are free for downloading (OA Articles)
Page 1 /113190
Display every page Item
Evaluación y Estandarización de la Calidad del Espermiograma: Nuevos Límites Inferiores de Referencia
Espinoza-Navarro,O; Sarabia,L;
International Journal of Morphology , 2011, DOI: 10.4067/S0717-95022011000300036
Abstract: spermogram or semen analysis is one of the most used parameters in the evaluation of male fertility.who (2010) presented the 5th manual for review and processing of human semen, a document that was discussed during the first workshop of standardization of semen analysis (pleas), held in santiago de chile, may 2010. subsequently appliedthenew values expressed in "lower referencelimit" (lrl) for semen in several analysisstudiesconductedbyvariousauthors (2003 to 2010). the results indicate that 81% of latin american researchers believe the new manual standardizes best sperm concentration, 96% agree with the new subclassification in progressive sperm motility (a), non-progressive (b) andimmobile (c). 68% determined that the best instruments for the sperm countis the neubauer haemocytometerchamber. regarding quality control only 18% performed external quality control. 100% ofresearchersbelieveit isappropriate to conductongoing standardization workshops. regarding the application of lrl in the study populations (2003-2010), 100% comply with the standards to be considered a population with fertility capacity. however, several authors argue that a new version of the who manual, must be re-done urgently to better standardize sperm concentration (15 million/ml) and morphology according to strict criteria (4%), reference values considered very low.
Inmunotitulación del Complejo Piruvato Deshidrogenasa en Hígado de rata durante un régimen de Inducción-Represión
De Marcucci,O; Escalona,I; Espinoza,J;
Revista de la Facultad de Medicina , 2002,
Abstract: the effects of nutrients on the amount of pyruvate dehydrogenase complex (pdc) present in hepatic mitochondria were investigated in sprague-dawley rats fed on a high-sucrose diet. after 21 days of feeding on a high-sucrose fat-free diet (slg), the animals were separated in two groups: one continued on the slg diet (induction) and the other received the same diet supplemented with 10% fish oil (repression). after 3 weeks, mitochondrial pdc activity was titrated against anti-rat pdc ig g to establish the amount of protein required to neutralize 200 mg of igg (pe, equivalence point). the slg diet produced an increase in the total activity of the complex and a decrease in pe as compared with control animals. fish oil feeding produced the opposite results. results indicate that immunetitration is a sensitive method to detect changes in the expression levels of pdc due to dietary manipulation.
Determinación del Porcentaje de Masa Grasa, según Mediciones de Perímetros Corporales, Peso y Talla: Un Estudio de Validación Determination of Fat Mass Percentage by Measuring Body Circumferences, Weight and Height: A Validation Study
J Díaz,O Espinoza-Navarro
International Journal of Morphology , 2012,
Abstract: La obesidad se caracteriza por un aumento excesivo de la grasa corporal. En Chile, en el a o 2010, se determinó que el 25,1% de la población sobre los 15 a os, presentaba obesidad y un 39,3 % sobrepeso. El objetivo de esta investigación fue validar un método económico y de fácil manejo para los profesionales de la Educación, que permita determinar los porcentajes de masa grasa (%MG) en población escolar, ocupando las variables de perímetros corporales, el peso y la talla (PPT). A una muestra de 1725 alumnos de ense anza básica, 1020 ni as y 705 ni os, de entre 10 a 14 a os de edad de la Comuna de Arica (XV Región), se les determinó el %MG según el modelo propuesto de perímetro, peso y talla (PPT). Como modelos de referencia se utilizaron los protocolos de Durnin & Womersley (1974) y el protocolo de Slaughter et al. (1988). Los resultados muestran que los índices de masa corporal (IMC), presentan valores normales de 21 kg/m2 tanto para ni as como ni os. La sumatoria de los pliegues corporales de bíceps, tríceps, subescapular, ilíaco y abdominal (S5), es significativamente mayor en la población femenina, respecto a los varones (108,5 mm y 81,4 mm respectivamente). La comparación del porcentaje de masa grasa, entre los diversos modelos en estudio demuestra que el modelo propuesto de PPT, no presenta diferencias significativas (NS). Todos ellos expresan valores sobre el 20% en la población en estudio, propio de sobrepeso y obesidad. Se concluye que el modelo de perímetros, peso y talla, es eficaz para determinar los porcentajes de masa grasa en población escolar. La población en estudio presenta altos índices de masa grasa. Obesity is characterized by an excessive increase in body fat. In Chile (2010), 25.1% and 39,3% of the population over 15 years old were reported with obesity and overweight respectively. The objective of this study was to validate an economic and easy method to use for education professionals to determine the percentage of fat mass (% FM) in schoolchildren, measuring the variables body circumferences, weight and height (CWH).A sample of 1725 primary school students, 1020 girls and 705 boys, in age of 10 to 14 years old from Arica (Region XV), were analyzed to determine % FM according to the model proposed (CWH), as reference models were used Durnin & Womersley protocols (1974) and the Slaughter et al. protocol (1988).The results show that body mass index (BMI), have normal values of 21 kg/m2 for both girls and boys. The sum of the body skinfolds biceps, triceps, subscapular, iliac and abdominal (S5) is significantly higher in women, com
Evaluación y Estandarización de la Calidad del Espermiograma: Nuevos Límites Inferiores de Referencia Evaluation and Standardization of the Quality of Semen: New Lower Reference Limit
O Espinoza-Navarro,L Sarabia
International Journal of Morphology , 2011,
Abstract: El análisis seminal o espermiograma es uno de los parámetros más usados en la evaluación de la fertilidad masculina. La OMS (WHO, 2010), presentó el 5 Manual para el examen y procesamiento del semen humano, documento que fue analizado durante el primer taller de estandarización del análisis seminal (PLEAS), realizado en Santiago de Chile, mayo del 2010. Posteriormente se aplicaron los nuevos valores indicados como "límite de referencia inferior" (LIR), en el estudio del análisis seminal realizados por varios autores (2003 al 2010). Los resultados obtenidos indican que el 81% de los investigadores latino americanos creen que el nuevo manual estandariza mejor la concentración espermática, un 96% está de acuerdo con la nueva subclasificación en la motilidad espermática en progresiva (A), no progresiva (B) e inmóviles (C). El 68% estima que el mejor instrumental de recuento es la cámara de Neubauer. Respecto a los controles de calidad solo el 18% realiza controles de calidad externa. El 100% de los investigadores estima conveniente realizar continuos talleres de estandarización. Respecto a la aplicación de los LIR en las poblaciones en estudio, todos ellos cumplirían con los estándares actuales para ser considerada una población con capacidad de fertilidad. Sin embargo varios autores opinan que una nueva versión del manual OMS, debe realizarse urgentemente para estandarizar mejor la concentración espermática (15 millones por mL) y la morfología según criterios estrictos (4%), valores de referencia que consideran muy bajos. Spermogram or semen analysis is one of the most used parameters in the evaluation of male fertility.WHO (2010) presented the 5th Manual for review and processing of human semen, a document that was discussed during the first workshop of standardization of semen analysis (PLEAS), held in Santiago de Chile, May 2010. Subsequently appliedthenew values expressed in "lower referencelimit" (LRL) for semen in several analysisstudiesconductedbyvariousauthors (2003 to 2010). The results indicate that 81% of Latin American researchers believe the new manual standardizes best sperm concentration, 96% agree with the new subclassification in progressive sperm motility (A), non-progressive (B) andimmobile (C). 68% determined that the best instruments for the sperm countis the Neubauer haemocytometerchamber. Regarding quality control only 18% performed external quality control. 100% ofresearchersbelieveit isappropriate to conductongoing standardization workshops. Regarding the application of LRL in the study populations (2003-2010), 100% comply with the
Inmunotitulación del Complejo Piruvato Deshidrogenasa en Hígado de rata durante un régimen de Inducción-Represión
O De Marcucci,I Escalona,J Espinoza
Revista de la Facultad de Medicina , 2002,
Abstract: Los efectos de nutrientes sobre la cantidad de PDC presente en las mitocondrias hepáticas fueron estudiados en ratas Sprague-Dawley que recibieron dietas ricas en sacarosa. Después de 21 días de recibir una dieta rica en sacarosa, libre de grasa (SLG), los animales se separaron en dos grupos, uno que continuó con la misma dieta (inducción) y el otro, la dieta suplementada con aceite de pescado al 10% (represión). Luego de 3 semanas, la actividad mitocondrial de PDC fue titulada con IgG anti-PDC de rata para establecer la cantidad de proteína necesaria para neutralizar 200 myg de IgG (PE; punto de equivalencia). La dieta SLG causó un incremento en la actividad del complejo y disminución en el PE en relación con los animales control, mientras que la dieta con aceite de pescado produjo efectos contrarios. La inmunotitulación es un método sensitivo para cuantificar cambios en la expresión de PDC causados por manipulaciones nutricionales. The effects of nutrients on the amount of pyruvate dehydrogenase complex (PDC) present in hepatic mitochondria were investigated in Sprague-Dawley rats fed on a high-sucrose diet. After 21 days of feeding on a high-sucrose fat-free diet (SLG), the animals were separated in two groups: one continued on the SLG diet (induction) and the other received the same diet supplemented with 10% fish oil (repression). After 3 weeks, mitochondrial PDC activity was titrated against anti-rat PDC Ig G to establish the amount of protein required to neutralize 200 mug of IgG (PE, equivalence point). The SLG diet produced an increase in the total activity of the complex and a decrease in PE as compared with control animals. Fish oil feeding produced the opposite results. Results indicate that immunetitration is a sensitive method to detect changes in the expression levels of PDC due to dietary manipulation.
Three-dimensional simulation of the entrance-impeller interaction of a hydraulic disc pump
Pérez,José Leonardo; Carrillo,Luis Pati?o; Espinoza,Henry;
Revista Técnica de la Facultad de Ingeniería Universidad del Zulia , 2006,
Abstract: a study of the fluidynamic behavior of the entrance-impeller interaction of a hydraulic disc pump is presented, through numerical simulations, using the finite volume method. a three-dimensional numerical model was developed, using the technique of multiblocks and structured meshes, by means of the commercial code cfx 4.3tm. the simulated model corresponds the flat impeller of (203 mm) of diameter to the exit, of a disc pump of simple suction. 8 flows were simulated, in those that the nominal flow, the maximum flow and the minimum flow were included. the simulations were carried out in stationary state and it took advantage the periodic condition of the flow inside the impeller, being reduced to section ?. the obtained load-flow curve was compared with the experimental pump curve given by the maker. the obtained curve, through the numerical results of the simulations, possesses a similar behavior to the experimental one, with values of load superiors to 15%, for the near flows to the nominal one. additionally, the interaction entrance-impeller was analyzed through of pressure and velocities profiles, that which allowed to know and to understand the behavior of these variables for the simulated conditions.
Hallazgo de Lophomonas sp. en secreciones del tracto respiratorio de ni?os hospitalizados con enfermedad pulmonar grave
Zerpa,Rito; Ore,Elsa; Pati?o,Lilian; Espinoza,Yrma A.;
Revista Peruana de Medicina Experimental y Salud Pública , 2010, DOI: 10.1590/S1726-46342010000400013
Abstract: lophomonas sp. is a habitual parasite of the intestinal tract of the cockroaches and that is not recognized as pathogenic human being. nevertheless, in the world literature are few reports of lophomonas sp. in respiratory tract secretions in patients with severe pulmonary disease, mostly in adults. we present evidences of lophomonas sp. in the respiratory low tract of children attended in the national reference center of paediatric diseases of lima, peru, in the period 2009- 2010. we found six cases, 4/23 from broncoalveolar lavage and 2/794 from tracheal aspirate samples of children. five of them had pneumonia and one atelectasis, four were hospitalized in the intensive care unit. increase knowledge about the presence of this organism in respiratory infections is needed, as its real pathogenic role.
Bacterias reductoras de Cr+6 y su potencial biotecnológico
ISLAS-ESPINOZA, Marina;BOJóRQUEZ-AGUILAR, Rocío;
Revista internacional de contaminación ambiental , 2011,
Abstract: bacteria that survive the pollutant mixing conditions of the upper basin of the lerma river (carl) require a specialized metabolism for survival. under this postulation, sediment was taken from three sites of the carl as a source of bacteria resistant to cr+6. at the site identified as lerma, greater variability of species was found in the group of selected bacteria that reduced cr+6. in tultepec, the highest population of cr+6 reducing bacteria was isolated. six strains with different morphological and biochemical characteristics were isolated from the sediments. these strains tolerated concentrations up to 1000 mg l-1 of cr+6 in liquid media. also they reduced cr+6 to cr+3 in percentages between 7 and 40, following 7 days, supplemented with 200 mg l-1 of cr+6. the strains studied were gram negative and showed a minimum inhibitory concentration greater than that found in other studies. the transformation capacity of each strain in descending order were: f, a, b, c, e and d. the kinetics of reduction of strain f showed the highest transformation of cr+6 to cr+3, obtaining a reduction of 33.59 % at 12 days. the biomass of strain f was not affected by the presence of cr+6. it is important to note that the medium itself represented a reduction of cr+6 (17.21 %). the use of the api-20e kit was helpful in determining some biochemical reactions of strains, however, this identification was not conclusive because it presented low percentages of similarity (83.1 to 90.7 %). these strains represent a potential of biotechnology for use in treatment systems to reduce cr+6 to cr+3, and even in trials of other heavy metals.
Reflujo Gastroesofágico: Evolución Clínica y Radiológica Gastro-esophageal Reflux: Clinical and Radiological evolution
Maureen Rossel G,Sergio Ceresa O,Julio Espinoza M
Revista chilena de pediatría , 1983,
Abstract:
Patrones Antropométricos y Consumo Máximo de Oxígeno (VO2) entre Ni os Escolares Chilenos Aymaras y No Aymaras de 10 a 12 A os, que Viven en Altura (3.500 msnm) y en la Planicie (500 msnm) Anthropometric Patterns and Oxygen Consumption (VO2) of School-children Aymara and Non-aymara of 10-12 Years, Living in High Altitude (3500m) and the Plain (500 m), from Chile
O Espinoza-Navarro,C Vega,A Urrutia,A Moreno
International Journal of Morphology , 2009,
Abstract: El objetivo del estudio fue comparar peso, talla, índice de masa corporal (IMC) y consumo de oxígeno (VO2 max) en una muestra de 73 alumnos de 10 a 12 a os del poblado de Putre a 3500 metros de altitud (n=31) y del pueblito de San Miguel de Azapa, que lo hacen a 500 metros de altitud (n=42). Los sujetos fueron evaluados según, procedencia, sexo y etnia aymará y No aymará. Los resultados muestran una disminución significativa de los patrones antropométricos de ni os y ni as de Putre en comparación con los de San Miguel de Azapa. Los aymará de Putre damas y varones presentan un IMC bajo lo normal (<20). Los varones aymará de San Miguel de Azapa presentan un peso significativamente mayor que los varones no aymará, sin embargo todos los alumnos de San Miguel expresan un IMC de normales. La distancia recorrida en metros (Test de 6 minutos de carrera continua) y el consumo máximo de oxígeno expresado en litros por minuto (VO2), no presentan diferencias significativas según sexo, etnia y localidad de origen de los ni os y ni as en estudio. Se concluye que el ambiente multiestresante de la altura (hipoxia hipobárica, bajas temperaturas y el nivel socioeconómico), tendría un gran impacto en el crecimiento infantil y el consumo máximo de oxígeno, lo que posiblemente reflejarían mecanismos adaptativos de los ni os y ni as de Putre. The objective of this study was to evaluate weight, height, body mass index (BMI) and oxygen consumption (VO2 max) in a sample of 73 students of 10 to 12 years from Putre to 3500 meters of altitude (n = 31) and San Miguel de Azapa, 500 meters of altitude (n = 42). Subjects were grouped according origin, gender, and aymara and non-aymara ethnic. The results show a significant decrease in anthropometric patterns in children of Putre compared with students from San Miguel de Azapa. Girls and boys Aymara of Putre have a BMI below normal (<20). Boys Aymara from San Miguel de Azapa have a significantly greater weight than boys non-aymara, however all students from San Miguel express a normal BMI. The distance traveled in meters (Test of 6 minutes of continuous running) and maximal oxygen consumption in liters per minute (VO2), not show significant differences by gender, ethnicity and geographic origin. We conclude that multistressful environment of the high altitude (hypobaric hypoxia, low temperatures and socioeconomic status), would have a major impact on child growth, and maximum oxygen consumption, possibly reflecting adaptive mechanisms of boys and girls from Putre.
Page 1 /113190
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.