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Search Results: 1 - 10 of 40217 matches for " MT;Castillo-Hernández "
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Ethnobotanic study of Randia aculeata (Rubiaceae) in Jamapa, Veracruz, Mexico, and its anti-snake venom effects on mouse tissue
Gallardo-Casas, CA;Guevara-Balcázar, G;Morales-Ramos, E;Tadeo-Jiménez, Y;Gutiérrez-Flores, O;Jiménez-Sánchez, N;Valadez-Oma?a, MT;Valenzuela-Vargas, MT;Castillo-Hernández, MC;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2012, DOI: 10.1590/S1678-91992012000300006
Abstract: in mexico, medicinal plants are widely used. the use of randia aculeata by healers against snakebites has never been scientifically tested in relation to possible effects on blood parameters and muscle tissue damage. interviews were carried out in jamapa, veracuz, mexico, with local residents to collect information about the traditional use of randia aculeata. in this locality, seven pieces of fruit from the plant are mixed in a liter of alcohol, and then administered orally against snakebites. by using histological techniques and a murine model, we explored its cytoprotective properties against the effects of crotalus simus and bothrops asper venoms. possible protections provided by the plant against tissue damage to skeletal and cardiac muscles and against the typical loss of red blood cells were analyzed. randia aculeata caused an increase in microhematocrit and total hemoglobin, parameters that are often decremented in association with the loss of red blood cells, which is a characteristic effect of animal venom. randia aculeata was also shown to protect against the lowering of platelet levels caused by bothrops asper venom. finally, randia aculeata produced a partial inhibition of necrosis following administration of snake venom in skeletal and myocardial muscles. the present results provide solid evidence for the traditional use of randia aculeata against snakebites, as demonstrated by protection against muscular tissue damage and the diminution of red blood cells.
Analysis of Physicochemical Properties of Mexican Gasoline and Diesel Reformulated with Ethanol
Patricia Castillo-Hernández,Alberto Mendoza-Domínguez,Porfirio Caballero-Mata
Ingeniería, investigación y tecnología , 2012,
Abstract: High energy prices, environmental issues and increasing importation of fossil fuels has provoked, in some countries, a reorientation of resources towards the development of biofuels that can partially substitute the consumption of fossil fuels. Ethanol is one of the biofuels more commonly used in the world; in the United States, Brazil and Australia gasoline blends that reach up to 85% Ethanol are commercialized. This work presents the results of a physicochemical characterization of commercial Mexican gasoline (Magna and Premium) and diesel blends with 10% vol. and 15% vol. anhydrous Ethanol. The analytical testing included: Research Octane Number, Motor Octane Number, Cetane Number, Reid Vapor Pressure, Distillation Curve and Heating Value. The stability of the blends was also evaluated. The theoretical emissions of CO2 were calculated based on the results of the physicochemical characterization. The ethanol-gasoline blends increased their Octane Number with respect to the commercial gasoline, while conserving an appropriate Distillation Index. The Cetane Number of the ethanol-diesel blends showed a substantial decrease, while the heating value of gasoline and diesel blends was negatively affected by the addition of ethanol. Nevertheless, taking into account the credits by the use of a renewable fuel, the use of the reformulated gasoline blends would imply a maximum theoretical reduction of 7.5% in CO2 emissions whereas in the case of ethanol-diesel blends it would represent a 9.2% decrease.
M. A. Ba?uelos-Saucedo,J. Castillo-Hernández,S. Quintana-Thierry,R. Damián-Zamacona
Journal of applied research and technology , 2003,
Abstract: Artificial neural networks base their processing capabilities in a parallel architecture, and this makes them useful to solve pattern recognition, system identification, and control problems. In this paper, we present a FPGA (Field Programmable Gate Array) based digital implementation of a McCulloch-Pitts type of neuron model with three types of non-linear activation function: step, ramp-saturation, and sigmoid. We present the VHDL language code used to implement the neurons as well as to present simulation results obtained with Xilinx Foundation 3.0 software. The results are analyzed in terms of speed and percentage of chip usage.
Síntesis y caracterización electroquímica de películas de SiO2 dopadas con Cerio por la técnica de sol-gel en medio básico
Domínguez-Crespo,M.A.; Ramírez-Meneses,E.; Torres-Huerta,A. M.; García-Murillo,A.; Arce-Estrada,E. M.; Castillo-Hernández,O. G.;
Portugaliae Electrochimica Acta , 2009,
Abstract: the use of silane formulations for the pre-treatment of metallic substrates prior to painting or as topcoat has been increasing during the recent years. the proposed formulations are very attractive because they present environmental friendliness, enhance adhesion properties and provide a barrier layer that delays the corrosion processes. one of the most used techniques to synthesized based-sio2 coatings is sol-gel. the preparation of sol-gel coatings with specific chemical functions offers potential advantages over traditional methods as it offers tailoring of their structure, texture and thickness and allows the fabrication of large coatings. the present work investigates the electrochemical behaviour of commercial carbon steel coated with ceria doped sio2 by sol-gel process in basic media. to evaluate the influence of temperature on adhesion and protective properties, the coatings were sintered at three different temperatures, 623 k, 723 k and 873 k, for 3 h. the anticorrosion behaviour, of the films has been characterized in an aggressive medium by electrochemical techniques, while structural characteristics and morphology was followed by x-ray diffraction, fourier transformed infra-red and scanning electron microscopy techniques. the results indicated that the thin films act as a protective barrier against exposure to the corrosive medium (3.5 wt-% nacl solution) and increase the lifetime of the susbtrate.
Doctor Luis Díaz Soto
Eusebio Raúl Castillo Hernández
Revista Cubana de Medicina Militar , 2008,
Guadalupe Hoyos Castillo,Oscar Hernández Lara
Quivera , 2008,
Abstract: Este artículo examina el proceso socio territorial de los municipios de Tepotzotlán y Valle de Bravo, a propósito de la instrumentación del Programa Pueblos Mágicos, esto desde la perspectiva analítica de la nueva ruralidad de perfil turístico. Aquí sostenemos que el programa puede acelerar los cambios sociales y de actividades en el territorio, al tiempo que concentra inversión ya que focaliza su actuación en estructuras turísticas dinámicas con larga trayectoria sin alcanzar derrama territorial y mejora en los niveles de bienestar de las comunidades sólo de empresarios involucrados.
Identidades colectivas en los márgenes de la nación: etnicidad y cambio religioso entre los mames de Chiapas
Rosalva Aída Hernández Castillo
Nueva antropología , 1994,
An Easy and Efficient Method to Functionalize Titanium Dioxide Nanoparticles with Maleic Anhydride  [PDF]
Pável C. Hernández Del Castillo, Saúl Robles Manuel, Facundo Ruiz
Soft Nanoscience Letters (SNL) , 2014, DOI: 10.4236/snl.2014.43008

In this work, titanium dioxide (TiO2) nanoparticles were functionalized with maleic anhydride (MA), using a non-polar (toluene) and polar protic (ethanol) solvents. The concentrations of MA in the reaction were varied to obtain the desired degree of functionalization. The samples were characterized with Fourier Transform Infrared Spectroscopy (FTIR), Diffuse Reflectance UV-Vis Spectroscopy (DRS), Thermal Analysis (TGA-DTA) and Nitrogen Adsorption (BET). The physical adsorption of organic molecules was eliminated by washing a number of times in water. Chemical stability between solid-organic phases was confirmed by TOC and thermal analysis. FT-IR and DRS results clearly show the chemical adsorption of MA on the TiO2. The UV-Vis spectroscopy is claimed to be a suitable technique to determine the achievement of TiO2 functionalization. Two different adsorptions geometries of MA were proposed. The presence of MA on the surface TiO2 increases the band gap. These results imply that TiO2 can be excited with less energy and increase the absorption of light in the visible region. The effectiveness of the functionalized nanoparticles to interact with organic materials is currently being studied with the intention of applying them in the energy and environmental sanitation fields.

A Geometric Morphometrics Study of Stigma-Anther Polymorphism in the Tropical Distylous Palicourea padifolia (Rubiaceae)  [PDF]
Angélica María Hernández-Ramírez, José A. Aké-Castillo
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.510160

Distyly is a floral polymorphism with long-styled flowers and short-styled flowers. Traditionally, floral traits in distylous species have been studied as a variable composed of several linear measurements. We proposed the use of a geometric morphometric approach to studying flower shape and entire flower design variation (including stigma-anther polymorphism) between morphs in Palicourea padifolia. The geometric morphometric approach allowed us to preserve the integrity of the floral form and to project the floral features on the same scale. Moreover, the visualization of a grid deformation allows us to describe shape differences between morphs as well as to estimate the variance-covariance matrix among floral traits. In this study, we demonstrated that flower shape and entire flower design differed between morphs. Intra- and inter-morph variations in the flower size were observed. The flower size has an effect on the anther position between morphs and among individuals. An association between flower shape and flower size was observed in both morphs. A pattern of floral features co-variation between the morphs was demonstrated in the species. In P. padifolia both morphs seemed to be internally coherent with respect to the developmental processes that produce flower shape variation. Changes in floral traits associated with flower size seemed to be more complex than those in the simple uniform expansion of the floral trait positions analogous between morphs. The observed pattern of co-variation of floral features between morphs suggested that flower base shape would be an additionally ancillary trait linked to the stigma-anther polymorphism in the species.

Algunos factores de riesgo en la adolescencia, hallazgos en un área de salud Some risk factors in adolescence, findings in a health area
Mireya álvarez Toste,Francisco Hernández-Bernal,Norayma Castillo Hernández,Yesenia Hernández álvarez
Revista Cubana de Higiene y Epidemiología , 2008,
Abstract: Se realizó un estudio descriptivo de corte transversal para identificar algunos factores de riesgo en adolescentes de un área de salud de la capital cubana en el a o 2004. El universo estuvo constituido por los alumnos que asisten a 2 secundarias básicas ubicadas en el área y por los profesores generales integrales que imparten clases a estos estudiantes. Se aplicó una encuesta a 364 adolescentes, entre estudiantes y profesores. La selección se realizó mediante un muestreo estratificado y por conglomerado monoetápico. Se encontró que la edad media de comienzo del hábito de fumar y el inicio de las relaciones sexuales fue de 12 a os para los estudiantes y 16 para los profesores; 46 % ha ingerido bebidas alcohólicas en edades tempranas y más del 5 % no está seguro de si en algún momento de su vida probarían las drogas. El inicio precoz de hábitos tóxicos son algunos de los principales riesgos encontrados. A descriptive and cross-sectional study was made to identify risk factors in adolescents from a health area of the Cuban capital during 2004. The universe was composed of students attending two secondary schools located in the area, and of integral general professors teaching these students. 364 adolescents, among students and professors, were surveyed. The selection was made by a stratified sampling and monostage conglomerate. It was observed that mean age to start smoking and to begin sexual relations was 12 years old for students and 16 for professors; 46 % had drunk alcohol at early ages, and more than 5 % were not sure if they would use drugs at a certain moment of their lives. The early beginning of toxic habits was among the main risks found.
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