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Search Results: 1 - 10 of 535167 matches for " Juan Luís Castejón Costa "
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El análisis de los efectos de la escuela sobre el rendimiento académico en matemáticas: Un análisis multinivel con datos de PISA 2003
Ma José Miralles Romero,Juan Luís Castejón Costa,Antonio Miguel Pérez Sánchez,Raquel Gilar Corbí
Revista de Psicología y Educación , 2012,
Abstract: Esta investigación, enmarcada dentro del movimiento sobre Eficacia de la Escuela, realiza una explotación parcial de los datos PISA 2003, para el territorio espa ol, obtenidos en la investigación llevada a cabo por la OCDE. El alumnado espa ol que ha participado en el estudio PISA, supone un total de 10.791 estudiantes de 383 centros de Educación Secundaría pertenecientes a varias Comunidades Autónomas. Las variables predictoras que forman parte de la investigación se obtienen de alumno y del centro. La variable de respuesta, desde un enfoque criterial, establece información sobre el nivel de competencias alcanzado por el alumno en matemáticas. Los resultados del análisis multinivel proporcionan diferentes modelos que tratan de explicar la variabilidad observada entre los centros a través de la incorporación de sus variables. El modelo resultante reconoce que las variables de centro: titularidad, porcentaje de alumnas, fomento de actividades matemáticas y compromiso y moral del alumnado se relacionan con el rendimiento en matemáticas.
Evaluación del estilo de ense anza-aprendizaje en estudiantes universitarios
Juan Luis Castejón Costa,Raquel Gilar Corbí
Revista de Psicología y Educación , 2005,
Abstract: The main objective of this work is the elaboration of an evaluation questionnaire about the preferences by certain teaching-learning styles of a group of university students, with the later purpose to establish if different people prefer different education-learning styles and if that preference by certain education-learning styles appears related to a greater performance. Data indicate that the students do not show clear preferences by education styles, in general they do not consider that any educational methods are better than others, but they prefer a combination of these styles and methods. Data show that the preference by one rich and varied learning environment is positively related to knowledge and abilities acquisition. The instructional implication is related with the employ of rich atmospheres of learning that stimulate the acquisition of competence.
INFLUENCIA DE LOS COMPORTAMIENTOS RELACIONALES DEL VENDEDOR INDIVIDUAL SOBRE LA SATISFACCIóN, CONFIANZA Y LEALTAD DEL COMPRADOR EN UN CONTEXTO DE PYMES INDUSTRIALES
Martín Castejón, Pedro Juan,Román Nicolás, Sergio,Fernández Sabiote, Estela
Investigaciones Europeas de Direccion y Economia de la Empresa , 2011,
Abstract: El presente trabajo se enmarca dentro del paradigma relacional de la venta personal, en un contexto de empresas industriales de peque o y mediado tama o (PYMES). En este ámbito se analiza el efecto de los comportamientos relacionales del vendedor personal (venta orientada y venta ética) sobre la satisfacción, confianza y lealtad del comprador con la empresa vendedora. El análisis de datos sobre una muestra de 219 PYMES industriales pone de manifiesto que la venta orientada y la venta ética tienen un efecto positivo y directo en la satisfacción y confianza, e indirecto en la lealtad a través de estas dos. Asimismo, los resultados muestran que la venta ética influye positivamente en la venta orientada al cliente. En conjunto, este estudio revela el papel crítico de la fuerza de ventas en un contexto industrial y pretenden fomentar el interés académico y empresarial por la gestión eficiente de la fuerza de ventas.
La superficie de separación placentaria
Castejón S,Olivar;
Revista de Obstetricia y Ginecología de Venezuela , 2001,
Abstract: summary objective: to expose the surface of placental separation and their deeper region which exhibit irregular microcavities described in relationship with the mechanism of cleavage. method: five normal placentas were selected and five specimens of each one were processed to h-e stain and scanning electron microscopy. setting: laboratory de microscopia electronica de barrido. ciadana. facultad de ciencias de la salud. universidad de carabobo. nucleo aragua, maracay. results: 90 percent of slides observed revealed microcavities built in the basal plate which seem fuse to form channels that get thin their structure. they were found in the place where cells die. conclusion: irregular microcavities located in the basal plate after cellular death seem to weaken the area of feto maternal junction in the mechanism of placental separation
La superficie de separación placentaria
Olivar Castejón S
Revista de Obstetricia y Ginecología de Venezuela , 2001,
Abstract: RESUMEN Objetivo: Exponer la superficie de separación placentaria y su región más profunda en la cual microcavidades irregulares se describen en función del mecanismo de desprendimiento placentario. Métodos: Se seleccionaron cinco placentas de parto normal de las cuales se tomaron muestras de cinco regiones de placa basal elaborándose cinco láminas te idas con hematoxilina-eosina. Los especímenes fueron observados y examinados con técnicas de microscopia de luz y electrónica de barrido. Ambiente: Laboratorio de Microscopia Electrónica de Barrido. CIADANA. Facultad de Ciencias de la Salud. Universidad de Carabobo. Núcleo Aragua, Maracay. Resultados: El 90% de las láminas observadas revelaron microcavidades empotradas en la placa basal. Estas parecen confluir o fusionarse para conformar canales más amplios que adelgazan el grosor de la placa. Ellas se localizan en los lugares de muerte celular. Conclusión: Microcavidades irregulares localizadas en la placa basal después de la muerte celular parecen debilitar la zona de unión fetomaterna en el mecanismo de separación placentaria SUMMARY Objective: To expose the surface of placental separation and their deeper region which exhibit irregular microcavities described in relationship with the mechanism of cleavage. Method: Five normal placentas were selected and five specimens of each one were processed to H-E stain and scanning electron microscopy. Setting: Laboratory de Microscopia Electronica de Barrido. CIADANA. Facultad de Ciencias de la Salud. Universidad de Carabobo. Nucleo Aragua, Maracay. Results: 90 percent of slides observed revealed microcavities built in the basal plate which seem fuse to form channels that get thin their structure. They were found in the place where cells die. Conclusion: Irregular microcavities located in the basal plate after cellular death seem to weaken the area of feto maternal junction in the mechanism of placental separation
Estructura y ultraestructura de Pythium insidiosum en la pitiosis gastrointestinal canina
Salas Araujo,Yaritza Josefina; Colmenares,Victoria del Rosario; Márquez Alvarado,Adelys Antonio; León,Juan Jesús Luis; Castejón,Olivar;
Revista de la Sociedad Venezolana de Microbiología , 2009,
Abstract: pythiosis is a granulomatous disease that occurs in humans and other mammals, produced by pythium insidiosum, a pseudofungus classified in the straminipila kingdom. in venezuela, pythiosis cases have been diagnosed in dogs with chronic hemorrhagic diarrhea; nevertheless, the structural and ultrastructural characteristics of the lesions have not been studied in depth. the objective set for this study was to describe, through scanning and transmission electron microscopy, the structure and ultrastructure of p. insidiosum, and the lesions it produces in the gastrointestinal tract of dogs. tissue samples from canines with a gastrointestinal pythiosis diagnosis, referred by the veterinary hospital of the universidad centroccidental ?lisandro alvarado?, were processed for electron microscopy study. the samples examined showed necrotic tissue, vascular thrombosis and numerous p. insidiosum hyphae, characterized by being long, ondulating, with flattened walls, 3 to 5 μm in diameter, ramified in a 90o angle, and externally surrounded by an electron dense granular material in the form of inlays, suggestive of the splendore-hoeppli phenomenon. it was concluded that canine pythiosis evolves with granulomatous and thrombotic lesions, which show that the etiologic agent maintains its integrity, in spite of being intimately related with phagocytic cells.
La diplomacia comercial en el centro de la diplomacia económica espa ola
Sánchez Castejón, Pedro
Anuario Jurídico y Económico Escurialense , 2013,
Abstract: El presente artículo analiza el protagonismo que la diplomacia comercial ha adquirido en la nueva diplomacia económica espa ola. Comenzaremos la investigación elaborando nuestra propia definición de diplomacia económica que nos servirá para estudiar los diferentes avances realizados en los últimos a os por parte del Gobierno de Espa a. Entre los más significativos la reforma del ICEX y la creación de plataformas público privada como las‘Fundaciones Consejo’.
MICROSCOPíA ELECTRóNICA DE BARRIDO DE LA HIPERPLASIA EN LA VELLOSIDAD MOLAR
Castejón S,Olivar; Castejón M,Oliver;
Revista chilena de obstetricia y ginecología , 2010, DOI: 10.4067/S0717-75262010000200005
Abstract: objective: study of the external surface of the syncytiotrophoblast in vesicles of hydatidiform mole was examined and analysed using scanning electron microscopy. method: vesicles of molar material were taken at 21 weeks of pregnancy and fxed in 2% of glutaraldehyde 0.1 m at 4 °c in delivery room and furtherly post-fxed in 1% of tetroxide of osmium according with conventional procedures of the scanning electron microscopy as dehydration, critical point drying, surface coating and examination using scanning electron microscope. result: the fndings reveal the morphological changes in the syncytial membrane from smooth surface with small bridges or granules to the formation of numerous prolongations of plasma membrane, which produce folds, bands or columns with ramifcations, that get in touch organizing a complex net that contain spaces opened to the intervillous space. this is an expression of the proliferation of syncytial plasma membrane during the hyperplasia. conclusion: the tridimensional observation of this net complex permit a better understanding of the structure of the molar vesicle when these images are compared with those of light microscopy.
MICROSCOPíA ELECTRóNICA DE BARRIDO DE LA HIPERPLASIA EN LA VELLOSIDAD MOLAR
Olivar Castejón S,Oliver Castejón M
Revista Chilena de Obstetricia y Ginecología , 2010,
Abstract: Objetivo: Estudio de la superfcie externa del sincitiotrofoblasto de vesículas de mola hidatidiforme, fue rastreada utilizando la microscopía electrónica de barrido. Método: Especimenes de material molar de 21 semanas de embarazo se fjaron en 2% de glutaraldehido 0,1 M a 4oC en sala de parto y posteriormente post fjados en 1% de tetraoxido de osmio siguiendo los procedimientos convencionales de la microscopía electrónica de barrido como deshidratación, desecado de punto crítico, cubrimiento iónico y observación con el microscopio electrónico de barrido. Resultados: Los resultados revelan cambios morfológicos en la membrana plasmática sincitial, desde superfcie aplanadas con peque os gránulos o promontorios, hasta la formación de numerosas prolongaciones de membrana que originan pliegues, bandas o columnas, las cuales se ramifcan intensamente, tomando contacto entre sí para conformar una complicada trama, que deja un retículo de espacios como cavernas, las cuales se abren hacia el espacio intervelloso siendo la expresión de una intensa proliferación de membranas en hiperplasia. Conclusión: La observación de esta trama permite un mejor entendimiento de la estructura de la mola comparada con las imágenes de microscopía de luz. Objective: Study of the external surface of the syncytiotrophoblast in vesicles of hydatidiform mole was examined and analysed using scanning electron microscopy. Method: Vesicles of molar material were taken at 21 weeks of pregnancy and fxed in 2% of glutaraldehyde 0.1 M at 4 °C in delivery room and furtherly post-fxed in 1% of tetroxide of osmium according with conventional procedures of the scanning electron microscopy as dehydration, critical point drying, surface coating and examination using scanning electron microscope. Result: The fndings reveal the morphological changes in the syncytial membrane from smooth surface with small bridges or granules to the formation of numerous prolongations of plasma membrane, which produce folds, bands or columns with ramifcations, that get in touch organizing a complex net that contain spaces opened to the intervillous space. This is an expression of the proliferation of syncytial plasma membrane during the hyperplasia. Conclusion: The tridimensional observation of this net complex permit a better understanding of the structure of the molar vesicle when these images are compared with those of light microscopy.
Personal and Emotional Factors in the Labour Integration of University Graduates in the Field of Education. Implications for University Teaching
Juan L. Castejón,Raquel Gilar,Pablo Mi?ano
CEPS Journal : Center for Educational Policy Studies Journal , 2011,
Abstract: The main aim of this paper is to analyse the role of intellectual, personal and emotional competencies as well as technical knowledge - academic achievement - in the employment of university graduates, with the purpose of incorporating these competencies into training programmes developed within the European Framework of Higher Education. This study is based on an initial sample of 118 university graduates in the field of education. We have gathered information about academic achievement and the intellectual, personal and emotional traits of this sample. From these data, and given the importance of non-intellectual aspects of intelligence associated with professional success, the specific contribution -incremental validity - of personal and emotional intelligence in explaining theemployment - labour integration - of university graduates in the field of education is studied. From this point onwards, we attempt to identify the key socio-emotional competencies in the field of education in order to establish the implications of including this type of skills in university training programmes within the European Higher Education Area.
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