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Search Results: 1 - 10 of 56116 matches for " Juan Manuel Vargas-Morales "
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Hexavalent Chromium Removal by Citrus limonium Shell  [PDF]
Juan Manuel Vargas-Morales, Diana Bautista-Mata, Juan F. Cárdenas-González, Ismael Acosta-Rodríguez, Víctor Manuel Martínez-Juárez
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2012, DOI: 10.4236/ojinm.2012.23003
Abstract: We studied the Chromium(VI) removal capacity in aqueous solution by the lemon shell, using the diphenylcarbazide method to evaluate the metal concentration. So, the highest biosorption of the metal (50 mg/L) occurs within 100 minutes, at pH of 1.0, and 28°C. According to temperature, the highest removal was observed at 60°C, in 11 minutes, when the metal (1 g/L) is completely adsorbed. At the analyzed concentrations of Cr(VI), lemon shell, showed excellent removal capacity, besides it removes efficiently the metal in situ (97.2% removal, 7 days of incubation, 5 g of biomass). After 1 hour of incubation the studied biomass reduces 1.0 g of Cr(VI) with the simultaneous production of Cr(III); so it can be used to eliminate it from industrial wastewater.
Induction of Extracellular Lytic Enzymes by Fusarium solani  [PDF]
María de Guadalupe Moctezuma-Zárate, Juan Manuel Vargas-Morales, Juan F. Cárdenas-González, Víctor Manuel Martínez-Juárez, Ismael Acosta-Rodríguez
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.38A005
Abstract:

Fusarium solani is a necrotrophic parasitic fungus that causes wilt in some plants, causing severe economic losses in some areas of the country. The objective of this work was to analyze the induction of extracellular lytic enzymes produced by a strain of F. solani, isolated from a culture of tomato, in Villa de Arista, S.L.P. México. Polygalacturonase activity has a greater induction time at 10 days, and the xylanase has two times higher activity at 8 and 13 days of incubation at 28?C. Also, the xylanase activities A and B were very stable at 4?C. After 7 days of incubation, it has an activity of 100% and 96%, respectively, while polygalacturonase retains 61% of its initial activity. Both activities are better induced with glutamate and urea as nitrogen sources respectively, and both exhibit an initial pH optimum of 5.5. Finally, we didnt find cellulase activity in the analyzing conditions.

Farmacocinética poblacional de carbamacepina en pacientes epilépticos adultos
Romano-Moreno, Silvia;Medina-Rojas, Eréndida Lizbeth;Salas-Ortiz, Ana Luisa;Vargas-Morales, Juan Manuel;Pérez-Urizar, José Trinidad;Rodríguez-Leyva, Idelfonso;
Revista de investigación clínica , 2005,
Abstract: the aim of the present study was to determinate the factors affecting carbamazepine (cbz) clearance (cl) in adults with epilepsy using a mixed-effect model and sparse data collected during routine clinical care. the patient population comprised 104 adults receiving cbz. a total of 161 cbz steady state serum concentration samples were analyzed. population cl was calculated by using nonmem with a one compartment model with first-order absorption and elimination. the following covariates were tested for their influence on clearance (cl): total body weight, age, dose/day, sex, surface area (sa) and comedication with primidone (prim), valproic acid or phenytoin (dfh). the final regression model for carbamazepine clearance found best to describe the data was: cl = (0.614 sa + 0.0016 dose/day)(1 + 0.278 dfh)(1 + 0.326 prim)
Parasitosis intestinal en ni os, en áreas de alta marginación socioeconómica de la región fronteriza de Chiapas, México
Morales-Espinoza Emma Marianela,Sánchez-Pérez Héctor Javier,García-Gil María del Mar,Vargas-Morales Guadalupe
Salud Pública de México , 2003,
Abstract: OBJETIVO: Estimar la prevalencia de parasitosis intestinal en ni os de zonas de alta marginación y su asociación con indicadores demográficos y socioeconómicos de interés. MATERIAL Y MéTODOS: En una muestra de 1478 menores de edad, de entre 1 a 14 a os, provenientes de 32 comunidades de la región fronteriza de Chiapas, México, de marzo a septiembre de 1998, se recolectaron tres muestras de heces fecales, seleccionadas aleatoriamente a partir del grado de marginación (alto y muy alto) del municipio al que pertenecen, y distancia de la unidad de salud más cercana a la comunidad (<1 hora; 1 hora o más). En una de cada cuatro viviendas con ni os menores de 15 a os de edad, seleccionadas aleatoriamente, se obtuvieron tres muestras de heces fecales de éstos. Se efectuaron análisis bivariados con la prueba de ji cuadrada y multivariados con modelos lineales generalizados. RESULTADOS: La prevalencia global de parasitosis fue de 67% (intervalo de confianza IC 95% 64-70%). Sesenta por ciento de los ni os estaban multiparasitados. La prevalencia de Entamoeba histolytica/E dispar fue de 51.2%, de Giardia lamblia, 18.3% y de Ascaris lumbricoides, 14.5%. La mayor prevalencia de E histolytica/E dispar se asoció con la edad y hablar algún idioma indígena; la de Ascaris lumbricoides con el sitio de obtención de agua y la carencia de refrigerador y electricidad. CONCLUSIONES: Es necesario hacer intervenciones locales de salud (calidad del agua, sistemas de desagüe), programas de educación sanitaria (promoción de la lactancia materna y medidas higiénicas) y promoción del habla de idiomas indígenas entre los médicos de la región.
Calidad bacteriológica del agua para consumo humano en zonas de alta marginación de Chiapas
Sánchez-Pérez,Héctor Javier; Vargas-Morales,María Guadalupe; Méndez-Sánchez,José Domingo;
Salud Pública de México , 2000, DOI: 10.1590/S0036-36342000000500005
Abstract: objective: to analyze the bacteriological quality of drinking water (bqdw) and its association with diarrhoea and intestinal parasites in children 1 to 14 years old, in areas of high levels of poverty in chiapas, mexico. material and methods: from march to september 1998, drinking water was collected from a random sample of 99 households in the border region of chiapas, mexico; data on diarrhoeal disease (in the past 15 days) were collected and stool testing for intestinal parasites was performed in children 1 to 14 years old (n= 322). the bqdw was determined by the filtration membrane technique. intestinal parasitic infections were determined by the faust method. the c2 statistic was used to analyse factors associated with bqdw. results: only 31% of the water samples were adequate for human consumption. the bqdw and the presence of diarrhoea (informed by the mothers of the children) showed no association. children living in households with inadequate bqdw had a higher prevalence of entamoeba histolytica and a greater tendency to have intestinal parasites. conclusions: it is necessary to develop programs that improve bqdw and to develop education efforts aimed at increasing the use of boiled water and the adequate management and care of community water storage sites.
Calidad bacteriológica del agua para consumo humano en zonas de alta marginación de Chiapas
Sánchez-Pérez Héctor Javier,Vargas-Morales María Guadalupe,Méndez-Sánchez José Domingo
Salud Pública de México , 2000,
Abstract: OBJETIVO: Analizar la calidad bacteriológica del agua (CBA) para consumo humano y su relación con diarreas y enteroparasitosis en ni os de 1 a 14 a os en comunidades de alta marginación socioeconómica de Chiapas, México. MATERIAL Y MéTODOS: En una muestra aleatoria de 99 viviendas de la Región Fronteriza de Chiapas, de marzo a septiembre de 1998, se recolectaron muestras de agua para consumo humano, se indagó sobre diarreas en los últimos 15 días y se recolectaron muestras de heces de 322 ni os de 1 a 14 a os. La CBA se determinó mediante la técnica de filtración por membranas y las enteroparasitosis por el método de Faust. Se utilizó el estadístico ji2 para el análisis de la CBA con relación a los diversos factores analizados. RESULTADOS: Sólo 31% de las muestras de agua fueron aptas para consumo humano. La CBA y la presencia de diarreas referida por las madres de los menores no mostraron asociación. Los ni os con mala CBA en sus viviendas mostraron mayor prevalencia de Entamoeba histolytica y mayor tendencia a estar parasitados. CONCLUSIONES: Es necesario desarrollar medidas que mejoren la CBA y campa as de educación que incrementen el uso de agua hervida, su manejo adecuado y el cuidado de las fuentes de abastecimiento comunitarias.
Intestinal parasites in children, in highly deprived areas in the border region of Chiapas, Mexico
Morales-Espinoza,Emma Marianela; Sánchez-Pérez,Héctor Javier; García-Gil,María del Mar; Vargas-Morales,Guadalupe; Méndez-Sánchez,José Domingo; Pérez-Ramírez,Margarita;
Salud Pública de México , 2003, DOI: 10.1590/S0036-36342003000500008
Abstract: objective: to assess the prevalence of intestinal parasitic infections among children in highly deprived areas, and its possible association with demographic and socioeconomic indicators. material and methods: from march to september 1998 in a convenience sample of 32 communities of the border region of chiapas, mexico, selected at random based on the level of poverty and distance from the community to the nearest health care unit (<1 hour; 1 hour or more), one of every four households with children under 15 years of age was randomly selected to provide three stool samples from their children (n 1478). bivariate and multivariate (generalized linear models for correlated binary data) analysis were performed. results: the global prevalence of intestinal parasitosis was 67% (95% confidence interval [ci] 64-70%). sixty percent had multiple parasites. the prevalence of entamoeba histolytica/e dispar was 51.2%, that of giardia lamblia 18.3%, and that of ascaris lumbricoides 14.5%. multivariate analysis showed that age and speaking an indigenous language were significantly associated with the presence of e histolytica/ e dispar and giardia lamblia. source of water and lacking a refrigerator and electricity were associated with the presence of ascaris lumbricoides. conclusions: measures should be taken to improve water quality, sewage disposal, and domestic hygiene. furthermore, health programs should be established to promote breast-feeding, and education policies aimed at reinforcing the use of indigenous languages by physicians in the health services.
Impacto del Programa de Evaluación Externa de la Calidad en Química Clínica en México de 2004 a 2008
Vargas Morales,Juan Manuel; Cano Escalante,Juan Jesús; Fragoso Morales,Lilia Esperanza;
Acta bioqu?-mica cl?-nica latinoamericana , 2010,
Abstract: the impact of the external quality assessment program, applicable to clinical laboratories in the area of clinical chemistry in mexico, was studied, based on laboratory results during the march 2008-february 2009 cycle and the 2004-2008 period, through analytical, longitudinal, retrospective analyses of the results obtained by the laboratories that participated in the external quality assessment program of the school of chemical sciences of universidad autónoma de san luis potosí. statistical analysis was performed with microsoft? office excel and epi info t programs. the percentage of clínical laboratories with acceptable performance (excellent and good) by analyte during the evaluation cycle in march 2008-february 2009 was 75% to 82%, whích íncreased when automated and semíautomated methods were used. for the 2004-2008 period, the laboratories, in 2004, had 3.02 times greatet risk of not qualifying with acceptable performance (p<0.05) than in 2008. in conclusión, the external qualíty assessment of the school of chemícal sciences of universidad autónoma de san luis potosí has had a strong impact on the overall performance of clinical laboratories, whích ensures the latter's qualíty.
Impacto del Programa de Evaluación Externa de la Calidad en Química Clínica en México de 2004 a 2008 Impact of the Program of External Quality Assessment in Clinical Chemistry in Mexico from 2004 to 2008
Juan Manuel Vargas Morales,Juan Jesús Cano Escalante,Lilia Esperanza Fragoso Morales
Acta bioqu?-mica cl?-nica latinoamericana , 2010,
Abstract: Se valoró el impacto del Programa de Evaluación Externa de la Calidad, aplicable a laboratorios clínicos en el área de Química Clínica, en México, con base en resultados obtenidos por los laboratorios durante el ciclo marzo 2008-febrero 2009 y el periodo 2004-2008, mediante un estudio analítico, longitudinal y retrospectivo de los resultados obtenidos por los laboratorios que participaron en el Programa de Evaluación Externa de la Calidad de la Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí. El análisis estadístico se realizó con los programas Microsoft Office Excel y Epi Info T. El porcentaje de laboratorios clínicos con desempe o aceptable (excelente y bueno) por analito, durante el ciclo de evaluación marzo 2008-febrero 2009, fue del 75% al 82%, que aumentó cuando se utilizaron métodos automatizados y semiautomatizados. Para el periodo 2004-2008, los laboratorios en 2004 tuvieron 3,02 veces mayor riesgo de no calificar con desempe o aceptable (p<0,05) que en 2008. En conclusión, el Programa de Evaluación Externa de la Calidad de la Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, ha tenido un impacto favorable en el desempe o global de los laboratorios clínicos, que permite asegurar su calidad analítica. The impact of the External Quality Assessment Program, applicable to clinical laboratories in the area of Clinical Chemistry in Mexico, was studied, based on laboratory results during the March 2008-February 2009 cycle and the 2004-2008 period, through analytical, longitudinal, retrospective analyses of the results obtained by the laboratories that participated in the External Quality Assessment Program of the School of Chemical Sciences of Universidad Autónoma de San Luis Potosí. Statistical analysis was performed with Microsoft Office Excel and Epi Info T programs. The percentage of clínical laboratories with acceptable performance (excellent and good) by analyte during the evaluation cycle in March 2008-February 2009 was 75% to 82%, whích íncreased when automated and semíautomated methods were used. For the 2004-2008 period, the laboratories, in 2004, had 3.02 times greatet risk of not qualifying with acceptable performance (p<0.05) than in 2008. In conclusión, the External Qualíty Assessment of the School of Chemícal Sciences of Universidad Autónoma de San Luis Potosí has had a strong impact on the overall performance of clinical laboratories, whích ensures the latter's qualíty.
Dos especies nuevas de Rhabdepyris (Hymenoptera, Bethylidae) de Colombia
Vargas-Rojas, Juan Manuel;
Iheringia. Série Zoologia , 2001, DOI: 10.1590/S0073-47212001000100013
Abstract: rhabdepyris (chlorepyris) humboldti sp. nov. and r. (c.) tarapachensis sp. nov. from colombia are described and illustrated. these species are specially peculiar by having pectinate antennae, which is the first report of this character for the genus.
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