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Search Results: 1 - 10 of 432001 matches for " M. Z. Figueroa-Torres "
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Sm FeTaO Photocatalyst for Degradation of Indigo Carmine Dye under Solar Light Irradiation
Leticia M. Torres-Martínez,Miguel A. Ruiz-Gómez,M. Z. Figueroa-Torres,Isaías Juárez-Ramírez,Edgar Moctezuma
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/939608
Abstract: This paper is focused to study Sm2FeTaO7 pyrochlore-type compound as solar photocatalyst for the degradation of indigo carmine dye in aqueous solution. Sm2FeTaO7 was synthesized by using conventional solid state reaction and sol-gel method. X-ray diffraction results indicated that Sm2FeTaO7 exhibit a monoclinic crystal structure. By scanning electron microscopy analysis, it was observed that sol-gel material presents particle size of around 150 nm. The specific surface area and energy bandgap values were 12 m2 g−1 and 2.0 eV, respectively. The photocatalytic results showed that indigo carmine molecule can be degraded under solar light irradiation using the synthesized materials, sol-gel photocatalyst was 8 times more active than solid state. On the other hand, when Sm2FeTaO7 was impregnated with CuO as cocatalyst the photocatalytic activity was increased because CuO acts as electron trap decreasing electron-hole pair recombination rates.
Effect of Copper and Iron on Acidogenic Biomass in an Anaerobic Packed Bed Reactor  [PDF]
Gonzalo M. Figueroa-Torres, Maria T. Certucha-Barragán, Francisco J. Almendariz-Tapia, Onofre Monge-Amaya, Evelia Acedo-Félix, Martín I. Pech-Canul, Ana L. Leal-Cruz, Carlos I. VillaVelázquez-Mendoza
Advances in Bioscience and Biotechnology (ABB) , 2014, DOI: 10.4236/abb.2014.56066
Abstract:

The aim of this study was to evaluate the effect of copper and iron on acidogenic biomass immobilized on clinoptilolite in an anaerobic packed bed reactor. Copper and iron were fed to the reactor at concentrations of 100 and 300 mg·L-1, respectively. Both metal ions had insignificant inhibitory effect over the metabolism of the biomass, specifically, on substrate consumption and production of volatile fatty acids (VFAs). The microstructural characterization of the biofilm by Scanning Electron Microscopy showed no effect on the morphology of the microorganisms after the metals treatment. Copper and iron removal was also measured in the reactor, achieving a breakthrough time of 3 days, during which removal efficiencies were higher than 90%. It was also observed that the biomass had a greater affinity for copper. The results indicate that acidogenic biomass can be used effectively as a sorbent agent. The pollution of river-streams with heavy metals—mainly copper and iron—was one of the most compelling motivations for conducting this investigation. The San Pedro River Basin, a trans-boundary river that originates near the mining town of Cananea, Sonora, México, and flows to Arizona, USA, exemplifies this environmental issue.

Fitoplancton del río Tehuantepec, Oaxaca, México y algunas relaciones biogeográficas
Moreno-Ruiz,José L; Tapia-García,Margarito; González-Macias,Ma. Del Carmen; Figueroa-Torres,Ma. Guadalupe;
Revista de Biología Tropical , 2008,
Abstract: phytoplankton from tehuantepec river, oaxaca, mexico and some biogeographical relationships. phytoplankton species collected from the limnetic to euryhaline sections of tehuantepec river were identified, classified and compared with regional information from mexico and south america. we collected 15 samples every three months from july 1997 through august 1998 with a 20 μm net and a van dorn bottle. indicator values and a code checklist are included. a total of 58 families, 121 genera, 273 species, one subspecies, 75 varieties, 13 forms and one morphotype were identified in the taxa bacillariophyta (42.0 %), chlorophyta (29.0 %), cyanoprocaryota (18.0 %), euglenophyta (5.0 %), dinophyta (3.0 %), cryptophyta (2.0 %) and chrysophyta (1.0 %). the predominant families were scenedesmaceae (24 species), oocystaceae (22), bacillariophyceae (21), chaetocerotaceae (15) and euglenaceae (14). five families, eight genera, 72 species, 45 varieties and eight forms are first records for mexico. the species chroococcus turgidus, microcystis flosaquae and pseudanabaena limnetica (which produce massive blooms or red tides) are important in this river of moderate water quality. rev. biol. trop. 56 (1): 27-54. epub 2008 march 31.
Leche humana y nutrición en el prematuro peque?o
Torres,G.; Argés,L.; Alberto,M.; Figueroa,R.;
Nutrición Hospitalaria , 2004,
Abstract: introduction: enteral feeding strategies of very low birth weight (vlbw) infants and when to start them have changed significantly in the last few years. controversy exists on which is the best regimen to feed this high risk group, since human milk has insufficient quantities of some nutrients. fortification of human milk improves growth rates and maintains immunologic, metabolic and emotional benefits. objective: to examine if early feeding of vlbw infants with higher amounts of human milk and human milk fortifiers could improve post-natal growth and maintain human milk production. study design: prospective study with historical control. subjects and methods: a group of 100 vlbw infants that were born between september 1999 and april 2000 were studied and were compared with another randomized group of similar birth weight (n = 31) that was born previously. the studied group was fed early with human milk (enteral trophic nutrition) and fortified with human milk fortifier when 100 ml/kg/day were reached, with rapid increase of the supplies according to tolerance and hemodynamic state. the control group was not fed early with human milk and was not given human milk fortifier. the collection of human milk in the studied group was highly stimulated. mothers extracted their milk more frequently in the "human milk lactary" and lived in a "residence for mothers" while their neonates were in the hospital. the mothers who could travel to the hospital were allowed to extract their milk in their homes with a supervised and controlled method (serial bacteriology, "lactary 24 hours program"). results: early feeding with human milk (enteral trophic nutrition), higher amounts of human milk and fortified with human milk fortifier, improved enteral tolerance and diminished significantly the number of days needed to regain birth weight, the days of fast and the days to reach the total enteral supply. frequent extractions of human milk increased the available amounts of milk and allow
Leche humana y nutrición en el prematuro peque o Human milk and very low birth weight nutrition
G. Torres,L. Argés,M. Alberto,R. Figueroa
Nutrición Hospitalaria , 2004,
Abstract: Introducción: En los últimos a os ha cambiado de manera significativa el momento de iniciar el aporte enteral en el recién nacido de Muy Bajo Peso de Nacimiento (RNMBPN). Además existen controversias sobre cuál es el mejor régimen para alimentar a este grupo de alto riesgo debido a las cantidades insuficientes de algunos nutrientes de la leche humana. El enriquecimiento de la leche humana con fortificadores de la leche humana mejora los índices de crecimiento conservando los beneficios inmunológicos, metabólicos y vinculares. Objetivo: Examinar si alimentar precozmente al RNMBPN (Nutrición Enteral Trófica) con mayores volúmenes de leche humana y fortificada con fortificadores de leche humana podría mejorar el crecimiento postnatal y mantener la producción láctea de las madres. Dise o: Estudio prospectivo con cohorte histórica de control. Personas y método: Se estudió un grupo de 100 RNMBPN que nacieron entre el 1 de septiembre de 1999 y el 30 de abril de 2000 y se lo comparó con otro grupo similar en peso (n = 31) nacido anteriormente y seleccionado al azar. El grupo de estudio fue alimentado precozmente con leche humana para estímulo trófico y luego fortificada con fortificadores de leche humana cuando se alcanzaba un aporte enteral de 100 mL/Kg/día, con rápidos incrementos de las raciones según tolerancia y adecuado estado hemodinámico. El grupo control no contó con fortificadores de leche humana y fue alimentado más tardíamente, con menores volúmenes y menor cantidad total de leche humana. La recolección de la leche humana en el grupo de estudio fue muy estimulada; las madres extrajeron su leche más frecuentemente en el Lactario de leche humana y contaban con una Residencia para Madres donde permanecieron aquellas con domicilio alejado mientras duraba la internación de sus hijos. A las que concurrían diariamente se les permitió traer la leche extraída en sus hogares, según técnica supervisada y controlada con bacteriología ("Programa Lactario de 24 Horas"). Resultados: La alimentación precoz con leche humana (nutrición enteral trófica) y con fortificadores de leche humana mejoró la tolerancia enteral, y disminuyó los días en recuperar el peso de nacimiento, los días de ayuno y también el tiempo en alcanzar el aporte enteral total, todos de manera significativa. Las extracciones frecuentes de leche humana aumentaron el volumen disponible para aportar a los recién nacidos y permitió la relactación. Luego del alta, las madres pudieron mantener una lactancia materna parcial con curvas de crecimiento aceptables al a o de edad corregida. Conclusión: Los rec
PM2.5 Emission Elemental Composition from Diverse Combustion Sources in the Metropolitan Area of Mexico City
V. Mugica,F. Mugica,M. Torres,J. Figueroa
The Scientific World Journal , 2008, DOI: 10.1100/tsw.2008.41
Abstract:
Superluminal X-shaped beams propagating without distortion along a coaxial guide
M. Zamboni-Rached,K. Z. Nobrega,Erasmo Recami,H. E. Hernandez-Figueroa
Physics , 2002, DOI: 10.1103/PhysRevE.66.046617
Abstract: In a previous paper [Phys. Rev. E64 (2001) 066603; e-print physics/0001039], we showed that localized Superluminal solutions to the Maxwell equations exist, which propagate down (non-evanescence) regions of a metallic cylindrical waveguide. In this paper we construct analogous non-dispersive waves propagating along coaxial cables. Such new solutions, in general, consist in trains of (undistorted) Superluminal "X-shaped" pulses. Particular attention is paid to the construction of finite total energy solutions. Any results of this kind may find application in the other fields in which an essential role is played by a wave-equation (like acoustics, geophysics, etc.). [PACS nos.: 03.50.De; 41.20;Jb; 83.50.Vr; 62.30.+d; 43.60.+d; 91.30.Fn; 04.30.Nk; 42.25.Bs; 46.40.Cd; 52.35.Lv. Keywords: Wave equations; Wave propagation; Localized beams; Superluminal waves; Coaxial cables; Bidirectional decomposition; Bessel beams; X-shaped waves; Maxwell equations; Microwaves; Optics; Special relativity; Coaxial metallic waveguides; Acoustics; Seismology; Mechanical waves; Elastic waves; Guided gravitational waves.]
Superluminal Localized Solutions to the wave equation, in (vacuum or) dispersive media, for arbitrary frequencies and with adjustable bandwidth
M. Zamboni-Rached,K. Z. Nobrega,H. E. Hernandez-Figueroa,Erasmo Recami
Physics , 2002, DOI: 10.1016/j.optcom.2003.08.022
Abstract: In this paper we set forth new exact analytical Superluminal localized solutions to the wave equation for arbitrary frequencies and adjustable bandwidth. The formulation presented here is rather simple, and its results can be expressed in terms of the ordinary, so-called "X-shaped waves". Moeover, by the present formalism we obtain the first analytical localized Superluminal approximate solutions which represent beams propagating in dispersive media. Our solutions may find application in different fields, like optics, microwaves, radio waves, and so on. [PACS nos.: 03.50.De ; 41.20.Jb ; 83.50.Vr ; 62.30.+d ; 43.60.+d ; 91.30.Fn ; 04.30.Nk ; 42.25.Bs ; 46.40.Cd ; 52.35.Lv. Keywords: Wave equation; Wave propagation; Optics; Localized beams; Superluminal waves; Bessel beams; X-shaped waves; Acoustics; Mechanical waves; Dispersion compensation; Seismology; Geophysics; Gravitational Waves; Elementary particle physics].
Buenas prácticas profesionales en la atención a las personas con dolor
Brea Rivero,P.; Salguero Cabalgante,R.; Almuedo Paz,A. M.; Rojas de Mora-Figueroa,A.; Torres Olivera,A.;
Revista de la Sociedad Espa?ola del Dolor , 2011,
Abstract: introduction: pain has serious emotional, social and economic consequences for people who suffer it, moreover these people are five times more likely to use health services. for the first time in spain, the regional ministry of health has launched a plan to give special attention to people in pain, with the objective of not only reducing the pain but also improving their quality of life and the attention to their needs throughout the medical process. since 2004, the andalusian agency for healthcare quality, as a certifying body of the andalusian public health system (sspa) accreditation system, has established the competence accreditation model which aims to recognize the professionals' excellence and help them in their development and continuous improvement. this model is based on a process through which the professionals verify the proximity between their real competences and best practices and those defined in their competences manuals. objectives: this study tries to describe the elements related to the attention given to people in pain contained in the competences manuals and highlighted by the professionals who have reached their competences accreditation by the sspa accreditation model. material and methods: transversal descriptive analysis of the elements related to the attention given to people in pain contained in the professional competences manuals and fulfilment of these elements submitted by professionals who access the programme. results: the doctors of health emergencies coordination teams and/or centres manual is the one that had the most elements related to the pain attention. manuals in which more than 70% of accredited professionals have submitted evidences related to people in pain correspond to: - orthopaedic surgeon. - doctor in casualties. - physiotherapist. - healthcare centre doctor with speciality in acupuncture. - medical oncology doctor. - radiation oncology doctor. - nurse in pre-hospital casualties. - doctors of health emergencies coor
Comparación en calidad de vida y estado nutricional entre alumnos de nutrición y dietética y de otras carreras universitarias de la Universidad Santo Tomás de Chile Comparison between the quality of life and nutritional status of nutrition students and those of other university careers at the Santo Thomas University in Chile
S. Durán Agüero,G. Bazaez Díaz,K. Figueroa Velásquez,M.R. Berlanga Zú?iga
Nutrición Hospitalaria , 2012, DOI: 10.3305/nh.2012.27.3.5746
Abstract: Objetivo: Determinar y comparar la calidad de vida, estado nutricional y auto percepción de imagen corporal entre estudiantes de Nutrición y Dietética (ND) con otras carreras (OC) de la Universidad Santo Tomas (UST), Sede Vi a del Mar. Métodos: Se evaluaron 200 estudiantes voluntarios (100 ND y 100 OC) aplicándoles: una encuesta de calidad de vida, evaluación nutricional y encuesta de autopercepción de imagen corporal. Resultados: El grupo ND presentó menor percepción de su calidad de vida, consumo de tabaco y sedentarismo. Mujeres ND presentaron menor IMC y circunferencia de cintura (CC) y hombres ND presentaron menor CC (p < 0,05). El grupo ND presentó un mayor consumo de leche, pollo (p < 0,05) y pescado (0,01), ambos grupos presentaron un elevado consumo de alcohol. La concordancia diagnóstica entre IMC y la imagen corporal es baja, 34% en ND y 38% en OC (Kappa 0,04 y 0,02) respectivamente. Conclusión: Con respecto a la percepción de calidad de vida es mejor en estudiantes de OC, sin embargo los estudiantes de ND presentaron mejor estado nutricional y selección de alimentos. Objective: To determine and compare the quality of life, nutritional status, and self-perceived body image between nutrition students and students from other careers from the University Santo Tomás-Vi a del Mar. Methods: We evaluated 200 student volunteers (100 nutrition students and 100 students from other careers) with a quality of life survey, a nutritional evaluation, and a survey of body image perception. Results: The group of nutritional students perceived a lower quality of life, consumed less tobacco, and was less sedentary. Women of the nutritional group had a lower BMI and showed a lower hip circumference. Men of the nutritional group also showed a lower hip circumference. The nutritional group consumed more milk, chicken, and fish in their diet. Both groups presented an elevated consumption of alcohol. The concordance between BMI and body image was low, 34% in the nutritional group and 38% in the other careers group (Kappa 0.04 and 0.02). Conclusion: With respect to perception of quality of life, students from other careers perceived a better quality of life, however students from the nutritional group presented better nutritional status and selection of food.
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