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Search Results: 1 - 10 of 47199 matches for " Ismael Hernández-Torres "
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Efecto de la sequía en la producción de biomasa y grano de frijol Drought effect in bean biomass and grain production
Efraín Acosta-Díaz,Ismael Hernández-Torres,Raúl Rodríguez-Guerra,Jorge Alberto Acosta-Gallegos
Revista mexicana de ciencias agrícolas , 2011,
Abstract: La sequía intermitente es el factor que más limita la producción de frijol (Phaseolus vulgaris L.) bajo temporal en México. El objetivo fue determinar el efecto de la sequía sobre la acumulación de biomasa del vástago y el rendimiento de grano en variedades criollas e introducidas de frijol de temporal. Se establecieron dos experimentos, uno con 21 variedades nativas y otro con 15 variedades introducidas, de diferente hábito de crecimiento indeterminado, en la Unidad Académica La Ascensión de la Facultad de Agronomía de la Universidad Autónoma de Nuevo León, México en 2009. Los experimentos se condujeron bajo dos tratamientos de humedad del suelo: riego durante todo el ciclo y sequía. En el tratamiento de riego el suelo se mantuvo por encima de 60% de humedad aprovechable durante el ciclo del cultivo, mediante la precipitación y cuatro riegos de auxilio (dos antes y otros dos después de floración), mientras que en el tratamiento de sequía el riego se suspendió a partir del inicio de la floración. En los dos experimentos, bajo la condición de sequía la acumulación de biomasa del vástago y el rendimiento de grano fue significativamente inferior (p≤ 0.01) que en el tratamiento de riego. En general, el efecto del tratamiento de sequía sobre el peso seco del vástago fue mayor en las variedades nativas, mientras que el efecto sobre el rendimiento de grano fue mayor en las variedades introducidas. En sequía, las variedades de mayor rendimiento, fueron: nativas, Pinto-2, Pinto-1, Amarillo Mantequilla, Boleado, Bayo Blanco, Canelo y Quipincillo Rojo-1 e introducidas, Peruano, Flor de Mayo Media Oreja, Pinto-5 y Ojo de Cabra. De acuerdo con el índice de susceptibilidad a la sequía y la media geométrica, las variedades más eficientes para la producción de rendimiento de grano en ambas condiciones de humedad fueron: Pinto-2, Amarillo Mantequilla, Pinto-1, Boleado, Peruano, Flor de Mayo Media Oreja, Pinto-5 y Ojo de Cabra; sin excepción, todas estas variedades fueron colectadas en la región de prueba, lo que demuestra la importancia de la adaptación local en condiciones de sequía. Intermittent drought is most limiting factor for bean production (Phaseolus vulgaris L.) under seasonal conditions in Mexico. Aim of this work was to determine drought effect on biomass accumulation of sprout and grain yield in creole and introduced seasonal bean varieties. Two experiments were set, one with 21 native varieties and another with 15 introduced varieties, from different uncertain type growth habit, at Academic Unit La Asención from Agronomy School of Universidad Autónoma de Nu
Efecto de la sequía en la producción de biomasa y grano de frijol
Acosta-Díaz, Efraín;Hernández-Torres, Ismael;Rodríguez-Guerra, Raúl;Pedroza-Flores, Jesús;Amador-Ramírez, Mario D.;Padilla-Ramírez, José Saúl;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: intermittent drought is most limiting factor for bean production (phaseolus vulgaris l.) under seasonal conditions in mexico. aim of this work was to determine drought effect on biomass accumulation of sprout and grain yield in creole and introduced seasonal bean varieties. two experiments were set, one with 21 native varieties and another with 15 introduced varieties, from different uncertain type growth habit, at academic unit la asención from agronomy school of universidad autónoma de nuevo león, mexico in 2009. experiments were done under two treatments of soil humidity: irrigation during whole cycle and drought. in irrigation treatment soil was kept above 60% of serviceable humidity during cultivation cycle, by precipitation and four irrigation aids (two before and other two after flowering), while in treatment of drought irrigation was suspended when flowering started. in both experiments, under drought condition biomass accumulation of sprout and grain yield was significantly lower (p≤ 0.01) than in irrigation treatment. in general, effect of drought treatment on sprout's dry weight was greater in native varieties, while effect on grain yield was greater in introduced varieties. in drought, varieties with higher yield were: native, pinto-2, pinto-1, amarillo mantequilla, boleado, bayo blanco, canelo and quipincillo rojo-1; and introduced, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra. in accordance with drought susceptibility index and geometric average, most efficient varieties for production of grain yield under both humidity conditions were: pinto-2, amarillo mantequilla, pinto-1, boleado, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra; without exception, all these varieties were collected in test region, which demonstrates importance of local adaptation under drought conditions.
Validación de la versión corta del Woman Abuse Screening Tool para su uso en atención primaria en Espa?a
Plazaola-Casta?o,Juncal; Ruiz-Pérez,Isabel; Hernández-Torres,Elisa;
Gaceta Sanitaria , 2008, DOI: 10.1590/S0213-91112008000500005
Abstract: objective: to examine the criterion validity of the spanish short version of the woman abuse screening tool (wast) to identify battered women among those attending primary health care services in spain. material and methods: we performed a cross-sectional study in two primary care centers in granada. a total of 390 women between 18 and 70 years old were studied. the index of spouse abuse (isa) was used as the gold standard. results: two score criteria were used. using the first criterion, 132 women (33.8%) scored positively. the sensitivity was 91.4%, specificity was 76.2%, positive predictive value 40.2% and negative predictive value was 98.1%. five women with a negative wast score obtained a positive isa score (false negatives). seventy-nine women obtained a positive score in the wast, with a negative score in the isa (false positives). conclusions: these results coincide with the sensitivity and specificity values obtained in the validation of the instrument in spanish-speaking women in the usa, which also recommend the use of the first criterion. the spanish short version of the wast is a suitable instrument to be used by health professionals for the early detection of gender violence in the healthcare context of spain. however, because of its low specificity, this instrument should be used with caution.
Factores fisiológicos y sociales asociados a la masa corporal de jóvenes mexicanos con discapacidad intelectual Physiological and social factors associated with increments of body mass of Mexican young people with intellectual disabilities
A. Ramos-Jiménez,A. Wall-Medrano,R. P. Hernández-Torres
Nutrición Hospitalaria , 2012,
Abstract: Introducción: Estudios sobre el estado de salud y nutrición de Mexicanos con discapacidad intelectual (DI) incluyendo aquellos con Síndrome de Down (SD), son escasos. Objetivo: Analizar algunos factores fisiológicos y sociales asociados a la masa corporal de jóvenes con DI del norte de México. Métodos: A 57 jóvenes con DI (17 ± 5 a os, SD = 16%) y al menos uno de sus tutores, se les midió su peso, talla, y otras variables antropométricas. Se determinó su IMC (kg/m2), somatotipo y estado nutricio mediante 3 criterios internacionales y glucosa, colesterol total y triacilglicéridos plasmáticos. Al tutor se le aplicó un cuestionario socioeconómico, de inseguridad alimentaria y conocimientos de nutrición. Resultados: Los participantes con SD eran 12 cm más peque os y median 6 mm más de pliegue subscapular (PSECP) que aquellos con otra DI (p < 0,05). El sobrepeso-obesidad estuvo presente en 70 y 44%, respectivamente. Los parámetros bioquímicos fueron similares entre grupos, pero 25% tenía alguna dislipidemia. El IMC del participante correlacionó (p < 0,01) con varios indicadores antropométricos y de adiposidad (r = 0,40 a 0,88), plasmáticos [triacilglicéridos (r = 0,48), colesterol total (r = 0,44)] y edad del participante y tutor (r = 0,35). El gasto en alimentos correlaciono con PSECP del participante (r = -0,33, p < 0,05). La circunferencia de cadera, cintura, pantorrilla y PSECP, explicaron el 89% de la varianza del IMC. Conclusión: La masa corporal de jóvenes con DI del norte de México se relaciona fuertemente con el grado de adiposidad corporal, con dislipidemias y con factores socioeconómicos de su entorno familiar. Introduction: Studies on the state of health and nutrition of Mexicans with intellectual disability (ID) including those with Down syndrome (DS), are scarce. Objective: To analyze some physiological and social factors associated with the body mass of young people with ID from northern México. Methods: Body weight, height and other anthropometric values were measured in fifty seven young (17 ± 5 years) participants with ID (DS,16%) and at least one guardian. BMI (kg/m2), somatotype and nutritional status were established by three international standards and total blood glucose, cholesterol & triacylglycerides, were also analyzed. Guardian's socio-economic, household food insecurity and nutrition literacy status were estimated with validated questionnaires by direct interview. Results: Participants with SD were 12 cm smaller but subscapular skinfold (SECPS) was 6 mm thicker than that from other ID participants (p < 0.05). Prevalence of overwe
Evaluación Inicial del Seguro Popular sobre el Gasto Catastrófico en Salud en México
Hernández-Torres,Jinneth; Avila-Burgos,Leticia; Valencia-Mendoza,Atanacio; Poblano-Verástegui,Ofelia;
Revista de Salud Pública , 2008, DOI: 10.1590/S0124-00642008000100003
Abstract: objective estimating seguro popular de salud's (sps) initial outcome regarding households' catastrophic health spending (chs). the relationship of other important factors to the ce was also estimated. material and methods a cross-sectional study, based on evaluating seguro popular's survey, was carried out in the mexican states of colima and campeche during 2002; it was carried out during the first semester of 2005. sps and other co-variables' relationship with chs was estimated by using the probit model. such relationship was then estimated again using the bi-probit model, but taking endogeneity between chs and sps affiliation into consideration. some simulations led to a detailed analysis of the influence of the use by type of service on the chs. results the probability of sps-affiliated households incurring chs was about 8% less than un-affiliated households (controlled for other co-variables and corrected for endogeneity). the probability of incurring chs was always less for affiliated people, independently of the income bracket which they belonged to and the kind of services used. conclusions the results suggested that sps is financially protecting households; nevertheless, the goal of a 75 % reduction in chs has still to be achieved.
Prevalencia de desnutrición en menores de cinco a os de Tabasco
Lastra-Escudero Lucio G.,Roldán-Fernández Silvia G.,Hernández-Martínez Enrique,Hernández-Torres Alma Patricia
Salud Pública de México , 1998,
Abstract: Objetivo. Evaluar la prevalencia de desnutrición que se presentó en ni os tabasque os menores de cinco a os en 1996, y su evolución entre 1991 y 1996. Material y métodos. Se realizó un estudio de corte transversal que incluyó a 1 256 ni os de 593 comunidades (31 urbanas y 562 rurales) de los 17 municipios de Tabasco. Resultados. El indicador peso/edad registró 41% de prevalencia de desnutrición, distribuida en leve (26.12%), moderada (12.62%) y severa (2.39%). En ni os de entre 1 y 5 a os la prevalencia de desnutrición fue de 45%. Conclusiones. De 1991 a 1996 la cifra de ni os con desnutrición ha disminuido proporcionalmente al incremento de la nutrición normal. Asimismo, han disminuido de seis a cuatro los municipios con indicadores críticos de desnutrición, con base en las acciones del sector salud en el estado de Tabasco.
Perfil epidemiológico general de las quejas médicas atendidas en la Comisión Nacional de Arbitraje Médico. 1996-2007
Fajardo-Dolci,Germán E; Hernández-Torres,Francisco; Santacruz-Varela,Javier; Hernández-ávila,Mauricio; Kuri-Morales,Pablo; Gómez-Bernal,Enrique;
Salud Pública de México , 2009, DOI: 10.1590/S0036-36342009000200007
Abstract: objective: to analyze medical complaints over a period of 11 years, for making recommendations for prevention and improving planning for responding. material and methods: we studied the medical complaints at the national medical arbitration commission (conamed, per its acronym in spanish) between 1996 and 2007 using descriptive statistics to identify their general profile in relation to the variables of time, place and person. we also studied the frequency of evident medical malpractice as well as the severity of the damage it produces. results: the request for responses to medical complaints increased between 1996 and 2007 and there was less demand between july and december. two states in the country account for 69.7% of the complaints and 74.0% are from public institutions. fifty-eight percent come from women and the 25-34 and 65+ age groups have the highest percentage. we found in 27.0% of the complaints there is evidence of medical malpractice and obstetrics and gynecology have the highest percentage of complaints, physical harm and severity of injury. complaints about treatment are nearly four times more than diagnosis. conclusions: it is necessary to improve the quality of diagnosis and treatment and identify cost-effective measures to reduce medical malpractice and the severity of physical damage in patients.
The Respiratory Exchange Ratio is Associated with Fitness Indicators Both in Trained and Untrained Men: A Possible Application for People with Reduced Exercise Tolerance
Arnulfo Ramos-Jiménez,Rosa P. Hernández-Torres,Patricia V. Torres-Durán,Jaime Romero-Gonzalez
Clinical Medicine : Circulatory, Respiratory and Pulmonary Medicine , 2008,
Abstract: Background: The respiratory exchange ratio (RER) indirectly shows the muscle′s oxidative capacity to get energy. Sedentarism, exercise and physically active lifestyles modify it. For that reason, this study evaluates the associations between RER during sub-maximum exercise and other well established fitness indicators (body fat, maximum heart rate, maximum O2 uptake, workload, and lactate threshold), in physically active trained and untrained men.Methods: The RER, O2 uptake and blood lactate were measured in eight endurance trained and eight untrained men (age, 22.9 ± 4.5 vs. 21.9 ± 2.8 years; body mass, 67.1 ± 5.4 vs. 72.2 ± 7.7 kg; body fat, 10.6 ± 2.4% vs. 16.6 ± 3.8% and maximum O2 uptake, 68.9 ± 6.3 vs. 51.6 ± 5.8 ml kg 1 min 1), during maximum exercise test and during three different sub-maximum exercises at fixed workload: below, within or above the lactate threshold.Results: Endurance trained men presented higher O2 uptake, lower blood lactate concentrations and lower RER values than those in untrained men at the three similar relative workloads. Even though with these differences in RER, a strong association (p < 0.05) of RER during sub-maximum exercise with the other well established fitness indicators was observed, and both maximum O2 uptake and lactate threshold determined more than 57% of its variance (p < 0.05).Conclusions: These data demonstrate that RER measurement under sub-maximum exercise conditions was well correlated with other established physical fitness indicators, despite training condition. Furthermore, the results suggest that RER could help obtain an easy approach of fitness status under low exercise intensity and could be utilized in subjects with reduced exercise tolerance.
A study of TiAlN coatings prepared by rf co-sputtering
García-González, L.;Garnica-Romo, M. G.;Hernández-Torres, J.;Espinoza-Beltrán, F. J.;
Brazilian Journal of Chemical Engineering , 2007, DOI: 10.1590/S0104-66322007000200009
Abstract: using the reactive magnetron rf co-sputtering technique and a ti target partially covered with a small al plate, tialn coatings were made on c-si in a reactive atmosphere of nitrogen and argon. coatings were deposited on substrates at 22°c and at 150°c. the substrate temperature notably affected the thickness, crystalline grain size, and hardness of the coatings. we analyzed the dependence of both structure and crystalline grain sizes on substrate temperature and the chemical composition of the coatings. the structural properties and the chemical composition were obtained by means of xrd and eds techniques. high aluminum content was found in the coatings for the samples grown at the lower substrate temperature when samples were measured by electron dispersive spectroscopy technique. atomic force microscopy measurements showed a surface morphology dependent on the nitrogen content. scanning electron microscopy measurements showed a clear pyramidal microstructure of tialn coatings grown at 22°c, while the microstructure of those grown at a substrate temperature of 150°c were not well defined.
Validez del cuestionario de hábitos y conductas físico-deportivas de Pierón en jóvenes del norte de México
Ramos-Jiménez, Arnulfo;Wall-Medrano, Abraham;Esparza-Del Villar, Oscar A.;Hernández-Torres, Rosa P.;
Revista electrónica de investigación educativa , 2010,
Abstract: several self-report questionnaires have been used to evaluate various determiners of sports practice in young people, but very few have been applied to mexicans. in this analysis, the questionnaire was administered to 222 subjects (13-25 years). we determined its internal consistency (cronbach α), content validity (document analysis), construct (exploratory factor analysis, efa) as well as that of the criterion. the latter, by its correlation (spearman) with anthropometric variables: body mass index (bmi) and waist circumference (wc) and physiological (vo2max). the results showed that the internal consistency is acceptable (cronbach's α = 0.68 to 0.85). moreover, this questionnaire similarly responds to queries posed in surveys already reported (to find out the physical, educational, psychological and socio-demographic characteristics of physical/sports practice). the efa showed 1, 2 and 3 factor structures with adequate cronbach's α (~0.70) and kaiser-meyer-olkin (~0.72) values. the practice of physical activity was associated with a lower bmi and higher vo2max. the questionnaire proved to be a valid instrument for investigating physical/sports habits and behavior in young people from northern mexico.
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