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Search Results: 1 - 10 of 6733 matches for " Leticia Castillo "
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Perfil de usuarios: Bibliotecas de la Universidad Pedagógica Experimental Libertador - Maracay
Vincentelli,Herminia; Castillo,Leticia;
Investigación y Postgrado , 2006,
Abstract: the purpose of the present article is to describe the user?s profile of all libraries at the universidad pedagógica experimental libertador, specifically at the rafael escobar lara branch in maracay. two aspects were considered: a) the visit motivation, and b) the requested service. the data was collected using a structure questionnaire applied to a random sample of 45 students-users in five libraries (pre-school, cidipmar, spanish language and literature, physics, and central). the data analysis showed that the most common motive (86%) is to work with academic duties and that the two most requested services were internet access (75.5%) and adequate space (69.7%). based on these results, two actions were recommended: a) promoting libraries functions other than academic, like it?s role to shape a well rounded individual; and b) taking into account the user?s needs in order to optimized services provided by the libraries.
DOLOR, ANSIEDAD, DEPRESIóN, AFRONTAMIENTO Y MALTRATO INFANTIL ENTRE PACIENTES FIBROMIáLGICOS, PACIENTES REUMáTICOS Y UN GRUPO CONTROL.*
TORRES A,LETICIA; TRONCOSO E.,SANDRA; CASTILLO**,RAMóN D;
Revista Latinoamericana de Psicología , 2006,
Abstract: the goal was to find differences among fibromyalgic patients (fm), rheumatoid illness patients, and a healthy control group (n = 15 ea). the variables tested among each group were pain, depressive symptoms, anxiety, coping strategies, and childhood maltreatment. a discriminant analysis was made, obtaining two functions of high levels of fit. patients with fm and rheumatoid illness showed equal levels of pain; however, patients with fm experienced more childhood maltreatment, currently experiencing more depression, less anxiety symptoms, and coping strategies. these functions correctly classified 53.3% of patients with fm and 60.0% of the other two groups; versus 33.3% expected at random. it is expected that by including sexual abuse in childhood and helplessness in clinical reports, improves the ability to detect patients with fm.
Afecto y consumo de alcohol en trabajadores de la industria petroquímica del sur de Veracruz, México
Leticia Cortaza Ramírez,Maria Magdalena Alonso Castillo
SMAD Revista Electrónica Salud Mental, Alcohol y Drogas , 2007,
Abstract: El propósito de este estudio fue conocer de qué manera afectan los factores personales biológicos, socioculturales y el afecto, el consumo de alcohol en los trabajadores de una industria petroquímica del sur de Veracruz, México. La muestra fue de 219 trabajadores, se aplicaron 2 cuestionarios: uno de Afecto Relacionado al Consumo de Alcohol y el AUDIT. Los resultados mostraron que los hombres consumen más que las mujeres (U=1042.50, p<.01), los trabajadores administrativos consumen más que los obreros (U=4333.50, p<.01). El sexo, la escolaridad y el ingreso económico tuvieron efecto significativo sobre el consumo de alcohol (F(3,215)=10.56, p<.01). El afecto negativo se asoció significativamente con el consumo da ino (rs=.22 p<.02) y mostró variación significativa antes, durante y después del consumo (p<.01).
Separación y purificación de fibras de sepiolita: contribución al procesamiento de arcillas especiales para uso industrial
Luciana Castillo,Leticia Lescano,Laura Sirvent,Silvia Barbosa
Geoacta , 2011,
Abstract: La sepiolita constituye uno de los minerales arcillosos con mayor área superficial, lo que permite la adsorción de agua, líquidos polares, iones y otras moléculas. Esta particular hidrofilicidad se debe a la presencia de centros de adsorción activos sobre la superficie de la sepiolita. Teniendo en cuenta que este mineral se utiliza en la industria de absorbentes y como carga de plásticos; la separación de las fibras, de modo de tener la mayor relación longitud/diámetro de las mismas, aumentaría el campo de aplicación y el valor agregado de este mineral no explotado en Argentina. En tal sentido, en el presente trabajo se analizan comparativamente los métodos de liofilización, ultrasonido y ataque ácido, para la separación y purificación de las fibras. La comparación se efectuó a partir de la caracterización del mineral antes y después de cada tratamiento por microscopía electrónica y óptica, difracción de rayos X, espectroscopía de infrarrojo y análisis térmico. Los resultados obtenidos con el tratamiento ácido lo definen como el mejor desde el punto de vista de la purificación, dado que provoca la total eliminación de los carbonatos. El ultrasonido logra una notoria disgregación de las fibras, observándose el desarrollo de una estructura gelificada, producto del alto grado de entrelazamiento de nanofibras que retienen moléculas de agua en su interior. En tanto que la liofilización produce un cambio morfológico sustancial en las fibras con respecto a su separación. Este tratamiento, en comparación a los otros métodos, permite además conservar la longitud inicial de las mismas. Los resultados obtenidos permiten inferir que la sepiolita puede procesarse de modo sencillo y ser usada con alto valor agregado en distintas industrias de nuestro país, sustituyendo la actual importación de la misma. Sepiolite is a clay minerals with greater surface area, allowing the adsorption of water, polar liquids, ions and other molecules. This particular hydrophilicity is due to the presence of active adsorption centers on the surface of sepiolite. Taking into account this mineral is used as absorbent and as reinforcement in plastics, the highest length/diameter ratio is needed in order to maximize properties. Then, fiber disaggregation would increase its application field and the added value of this untapped mineral in Argentina. In this work, different methods as liofilization, sonication and acid leaching are explored, focusing in the optimization of disaggregation and purification of the fibers. The comparative analysis was made through the sepiolite characterization be
Endothermy and floral utilization of Cyclocephala caelestis (Coleoptera: Scarabaeoidea; Melolonthidae); a cloud forest endemic beetle
Gregg Dieringer,Pedro Reyes Castillo,Manuel Lara,Leticia Cabrera R.
Acta zoológica mexicana , 1998,
Abstract:
Dolor, ansiedad, depresión, afrontamiento y maltrato infantil entre pacientes fibromiálgicos, pacientes reumáticos y un grupo control
Leticia Torres A.,Sandra Troncoso E.,Ramón D. Castillo
Revista Latinoamericana de Psicología , 2006,
Abstract: El objetivo fue comparar mujeres con fibromialgia (FM), con un grupo de mujeres con enfermedad reumática y un grupo control sano (n = 15 cada uno); en las variables dolor, sintomatología depresiva y ansiosa, estrategias de afrontamiento y maltrato en la infancia. Se hizo un análisis discriminante y se obtuvieron dos funciones con altos niveles de ajuste. Los pacientes con FM y enfermedad reumática muestran similares niveles de dolor, sin embargo el primer grupo tuvo más experiencias de maltrato en la infancia y experimenta en la actualidad mayor depresión, menores niveles de ansiedad y menos uso de estrategias de afrontamiento. Estas funciones clasificaron correctamente al 53,3% de los pacientes con FM y el 60% de los otros grupos, versus el 33,3% esperado por azar. Se espera que al incluir informes de experiencias de abuso sexual en la infancia y niveles desesperanza en la actualidad, aumente la capacidad para detectar pacientes con FM
Separation of time-scales and reparametrization invariance for aging systems
Claudio Chamon,Malcolm P. Kennett,Horacio Castillo,Leticia F. Cugliandolo
Physics , 2001, DOI: 10.1103/PhysRevLett.89.217201
Abstract: We show that the generating functional describing the slow dynamics of spin glass systems is invariant under reparametrizations of the time. This result is general and applies for both infinite and short range models. It follows simply from the assumption that a separation between short time-scales and long time-scales exists in the system, and the constraints of causality and unitarity. Global time reparametrization invariance suggests that the low action excitations in a spin glass may be smoothly spatially varying time reparametrizations. These Goldstone modes may provide the basis for an analytic dynamical theory of short range spin glasses.
LA TéCNICA DE MANTOUX EN POBLACIóN INDíGENA. CASO DE ESTUDIO
HERNáNDEZ ZARZA, NANCY MANUELA;SáNCHEZ CASTILLO, LETICIA;OLVERA CASTILLO, ROMUALDO;GARCíA CRUZ, ANDREA;
Revista del Instituto Nacional de Enfermedades Respiratorias , 2004,
Abstract: introduction : participation in nursing in the tuberculosis program is extremely important, since most activities involve the intensive search of respiratory symptoms. a useful tool to detect tuberculosis is the mantoux technique. objectives: to train a nurse in the application and reading of ppd with the mantoux technique. to measure tuberculosis prevalence in school children. to evaluate concordance between the newly trained and a reference nurse. material and methods: transversal prospective study which included coordination with the local government authorities. informed consent was obtained from parents after an instructive talk. applications were performed and readings obtained 72 h after. results: a total of 800 mantoux tests were applied; 24.3% were above 10mm. in the 11 to 15 age group, 275 children were positive; chemoprophylaxis was provided to 200 children, and 185 completed treatment. conclusions: adverse socioeconomic and environmental conditions are risk factors in the development of active tuberculosis. state health services should afford resources to identify high risk tuberculosis regions and perform public health actions.
Separación y purificación de fibras de sepiolita: contribución al procesamiento de arcillas especiales para uso industrial
Castillo,Luciana; Lescano,Leticia; Sirvent,Laura; Barbosa,Silvia; Marfil,Silvina; Maiza,Pedro;
Geoacta , 2011,
Abstract: sepiolite is a clay minerals with greater surface area, allowing the adsorption of water, polar liquids, ions and other molecules. this particular hydrophilicity is due to the presence of active adsorption centers on the surface of sepiolite. taking into account this mineral is used as absorbent and as reinforcement in plastics, the highest length/diameter ratio is needed in order to maximize properties. then, fiber disaggregation would increase its application field and the added value of this untapped mineral in argentina. in this work, different methods as liofilization, sonication and acid leaching are explored, focusing in the optimization of disaggregation and purification of the fibers. the comparative analysis was made through the sepiolite characterization before and after each treatment by electronic and optical microscopy, x ray diffraction, infrared spectroscopy and thermal analysis. the results obtained from the acid leaching describe it as the better treatment respect to the sepiolite purification due to carbonates elimination. the sonication allows a particular disaggregation, leading to a gel structure development, product of the high entanglement of nanofibers which retain water molecules inside the network. in the case of the liofilization, it produces a substantial morphological variation of the fibers respect to their disaggregation. this method is the best for conserving the initial length of the fibers. these results allow inferring that the sepiolite can be easily processed and be used in different industries in our country with a high added value, replacing its importation.
Salmonelosis y campilobacteriosis, las zoonosis emergentes de mayor expansión en el mundo
Gutiérrez Castillo, Adriana del Carmen;Paasch Martínez, Leopoldo Henri;Calderón Apodaca, Norma Leticia;
Veterinaria México , 2008,
Abstract: nowadays salmonellosis and campylobacteriosis are the most prevalent diseases transmitted to humans through contaminated food of animal origin in developed countries. propagation of salmonella enterica serotype enteritidis and salmonella enterica serotype typhimurium has increased since the second half of the twentieth century, derived from two changes in the epidemiology of salmonellosis that occurred worldwide: the emergence of human infections caused by salmonella enteritidis, and the multiple resistances against antibiotics of salmonella typhimurium strains. most retrospective studies suggest an epidemiological relationship between human infections and poultry products. modernization of poultry industry and exportation of progenitor stock birds have played an important roll disseminating salmonella enteritidis. campylobacteriosis is the most frequent enteric bacterial diseases in developed countries. campylobacter jejuni is the most frequent cause of acute infectious diarrheas, and the sources of infection are mainly poultry products. the present review includes relevant taxonomic and pathogenic aspects of these organisms; and stresses the problematic of diagnosis and detection, analyzing techniques that permit rapid detection of animal carriers. finally, some preliminary findings, not yet published, suggest that a prevalence of salmonellosis and campylobacteriosis in mexican poultry farms must be similar to that found in other countries with massive poultry production; therefore, epidemiological studies to determine the frequency of human infections, derived from poultry consumption, are recommended.
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