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Search Results: 1 - 10 of 226838 matches for " Javier Morales Pérez "
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ANáLISIS DISCRIMINANTE DE ALGUNAS VARIABLES QUE INFLUYEN EN LA CONTAMINACIóN ACúSTICA DEBIDA AL TRáFICO URBANO EN UNA GRAN CIUDAD DISCRIMINANT ANALYSIS OF SOME VARIABLES THAT IMPACT ACOUSTIC CONTAMINATION CAUSED BY URBAN TRAFFIC IN A BIG CITY
Javier Morales Pérez,Jaime Fernández Gómez
Revista Ingenierías Universidad de Medellín , 2012,
Abstract: El ruido producido por el tráfico es función de un gran número de variables, unas propias de las características de la calzada y del entorno por el que discurre, y otras propias de los vehículos. De todas las variables que pueden influir, solo unas pocas están estudiadas en profundidad para ver su relación real con la contaminación acústica. El nivel de presión sonora, Leq, es el índice utilizado para evaluar la contaminación acústica, y la unidad de medida es el decibelio. Esta investigación consiste en la medición de todas las variables presentes en una gran ciudad que pudieran tener alguna influencia en la contaminación acústica, así como el nivel de ruido en la ciudad de Madrid. Todo ello mediante un trabajo de campo en el que se han medido 519 puntos de forma aleatoria, en los que se iban registrando todos estos datos. Noise caused by traffic is the result of several variables; ones inherent to features of roads and the environment it crosses, and some others inherent to vehicles. From all variables which could cause this kind of noise, only few of them have been studied in depth intended to understand its real relationship to acoustic contamination. The level of sound pressure (Leq.) is the index used for evaluating acoustic contamination and the unit of measure is the decibel. This research involves measurement of all variables present in a big city which could have an impact on acoustic contamination, as well as the level of noise in Madrid City. All this conducted through a field work where 519 places were randomly measured and all this data were recorded
Ampliación del ámbito geográfico-altitudinal y uso de hábitats suburbanos por la mascarita pico grueso (Geothlypis poliocephala)
MacGregor-Fors, Ian;Schondube, Jorge E.;Morales-Pérez, Lorena;Quesada, Javier;
Revista mexicana de biodiversidad , 2008,
Abstract: the first record of the grey-crowned yellowthroat (geothlypis poliocephala) in the transmexican volcanic belt biogeographic region (mexico), within the morelia city suburbs is presented. sites were this parulid was sighted / captured were located 427 m higher than its described altitudinal range. this could be due to 2 factors: 1) urbanization generates suitable habitats for this species in periurban areas, and 2) temperature values have increased in the region where the city of morelia is located. these factors allow that a lowland bird species can inhabit in more elevated areas. thus, our records suggest that the grey-crowned yellowthroat can be catalogued as potential to use suburban environments when these are similar to those used by the species on its natural distribution area.
Ampliación del ámbito geográfico-altitudinal y uso de hábitats suburbanos por la mascarita pico grueso (Geothlypis poliocephala) Geographic-altitudinal range extension and suburban habitat use of the Grey-crowned Yellowthroat (Geothlypis poliocephala)
Ian MacGregor-Fors,Jorge E. Schondube,Lorena Morales-Pérez,Javier Quesada
Revista mexicana de biodiversidad , 2008,
Abstract: Se presenta el primer registro de la mascarita pico grueso (Geothlypis poliocephala) para la región del Eje Neovolcánico Transversal, México. Los sitios donde registramos/capturamos esta especie se encuentran en los suburbios de la ciudad de Morelia, 427 m arriba del ámbito altitudinal descrito para la especie. Esto puede deberse a 2 factores: 1) la urbanización que genera hábitats propicios para la especie en su periferia, y 2 ) el incremento de la temperatura en la región en la que se encuentra la ciudad de Morelia. Ambos factores facilitan que esta especie de tierras bajas pueda habitar en áreas de mayor altitud. Así, nuestros registros sugieren que la mascarita pico grueso puede catalogarse como especie potencial a utilizar hábitats suburbanos cuando éstos son similares a los hábitats en los que se distribuye de manera natural. The first record of the Grey-crowned Yellowthroat (Geothlypis poliocephala) in the Transmexican Volcanic Belt biogeographic region (Mexico), within the Morelia city suburbs is presented. Sites were this parulid was sighted / captured were located 427 m higher than its described altitudinal range. This could be due to 2 factors: 1) urbanization generates suitable habitats for this species in periurban areas, and 2) temperature values have increased in the region where the city of Morelia is located. These factors allow that a lowland bird species can inhabit in more elevated areas. Thus, our records suggest that the Grey-crowned Yellowthroat can be catalogued as potential to use suburban environments when these are similar to those used by the species on its natural distribution area.
Introducción del hiperentorno de Virología Médica en el programa de la asignatura Agentes Biológicos Introducing the hyperenvironment of Medical Virology in the program of the matter Biological Agents
Regina Yamilet Sosa Díaz,Caridad Julia Fernández Rodríguez,Yeinier Hechevarría Morales,Javier Gómez Pérez
Revista M??dica Electr?3nica , 2010,
Abstract: La Educación Superior en nuestro país se encuentra inmersa en una ola de cambios, de los que no escapan las carreras de las ciencias m édicas. La asignatura de Agentes Biológicos como parte de las que integran la carrera de medicina no está exenta de la carencia de medios informatizados adecuados para asumir el proceso de ense anza-aprendizaje en las actuales condiciones. Para dar solución a esta limitante el colectivo de profesores de esta asignatura en la Universidad Médica de Matanzas se propuso integrar el programa de la misma a hiperentornos que tributen a cada uno de los temas que la conforman, realizando una integración didáctica de todos los contenidos. El primer hiperentorno desarrollado fue el de Virología Médica. La investigación consta de dos etapas divididas cada una en dos fases. La primera fue la etapa de la confección del hiperentorno, en que se consideró una fase de diagnóstico y una fase de dise o. El hiperentorno facilita no sólo la transferencia de información, sino también la organización del acceso a la misma, la organización de la colaboración y la actividad independiente del educando, en correspondencia con las exigencias didácticas de la universalización. En la segunda etapa, se elaboró una propuesta didáctica para la introducción del hiperentorno dise ado en el proceso de ense anza-aprendizaje de la asignatura, y se realizó una valoración de su introducción después de haber sido utilizado durante un curso académico. High Education in our country is immersed in a wave of changes, from which Medical sciences do not escape. The matter Biological Agents, as one of those integrating the medical specialty, is not free of lacks in adequate informatics media to assume the teaching-learning process in the current conditions. To solve this limiter, the teaching staff of this matter at Matanzas Medical University proposed themselves to integrate its program to hyperenvironments rendering to each of the themes conforming it, didactically integrating all the contents. The first developed hyperenvironment was Medical Virology. This investigation has two stages, divided in two phases each of them. The first stage was building the hyperenvironment, considering a diagnostic phase and a designing one. The hyperenvironment makes easier not only information transference, but also the organization to access, the collaborative organization and the students' independent activity, according to the universalization didactical exigencies. In the second stage, we made a didactical proposition to introduce the designed hyperenvironment in the teaching-lea
Frugivore Behavioural Details Matter for Seed Dispersal: A Multi-Species Model for Cantabrian Thrushes and Trees
Juan Manuel Morales, Daniel García, Daniel Martínez, Javier Rodriguez-Pérez, José Manuel Herrera
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0065216
Abstract: Animal movement and behaviour is fundamental for ecosystem functioning. The process of seed dispersal by frugivorous animals is a showcase for this paradigm since their behaviour shapes the spatial patterns of the earliest stage of plant regeneration. However, we still lack a general understanding of how intrinsic (frugivore and plant species traits) and extrinsic (landscape features) factors interact to determine how seeds of a given species are more likely to be deposited in some places more than in others. We develop a multi-species mechanistic model of seed dispersal based on frugivore behavioural responses to landscape heterogeneity. The model was fitted to data from three-years of spatially-explicit field observations on the behaviour of six frugivorous thrushes and the fruiting patterns of three fleshy-fruited trees in a secondary forest of the Cantabrian range (N Spain). With such model we explore how seed rain patterns arise from the interaction between animal behaviour and landscape heterogeneity. We show that different species of thrushes respond differently to landscape heterogeneity even though they belong to the same genus, and that provide complementary seed dispersal functions. Simulated seed rain patterns are only realistic when at least some landscape heterogeneity (forest cover and fruit abundance) is taken into account. The common and simple approach of re-sampling movement data to quantify seed dispersal produces biases in both the distance and the habitat at which seeds arrive. Movement behaviour not only affects dispersal distance and seed rain patterns but also can affect frugivore diet composition even if there is no built-in preference for fruiting species. In summary, the fate of seeds produced by a given plant species is strongly affected by both the composition of the frugivore assemblage and the landscape-scale context of the plant location, including the presence of fruits from other plants (from the same or different species).
Characterization and extraction of the synaptic apposition surface for synaptic geometry analysis
Juan Morales,Angel Rodríguez,José-Rodrigo Rodríguez,Javier DeFelipe,Angel Merchán-Pérez
Frontiers in Neuroanatomy , 2013, DOI: 10.3389/fnana.2013.00020
Abstract: Geometrical features of chemical synapses are relevant to their function. Two critical components of the synaptic junction are the active zone (AZ) and the postsynaptic density (PSD), as they are related to the probability of synaptic release and the number of postsynaptic receptors, respectively. Morphological studies of these structures are greatly facilitated by the use of recent electron microscopy techniques, such as combined focused ion beam milling and scanning electron microscopy (FIB/SEM), and software tools that permit reconstruction of large numbers of synapses in three dimensions. Since the AZ and the PSD are in close apposition and have a similar surface area, they can be represented by a single surface—the synaptic apposition surface (SAS). We have developed an efficient computational technique to automatically extract this surface from synaptic junctions that have previously been three-dimensionally reconstructed from actual tissue samples imaged by automated FIB/SEM. Given its relationship with the release probability and the number of postsynaptic receptors, the surface area of the SAS is a functionally relevant measure of the size of a synapse that can complement other geometrical features like the volume of the reconstructed synaptic junction, the equivalent ellipsoid size and the Feret's diameter.
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.
Introducción del hiperentorno de Virología Médica en el programa de la asignatura Agentes Biológicos
Sosa Díaz,Regina Yamilet; Fernández Rodríguez,Caridad Julia; Hechevarría Morales,Yeinier; Gómez Pérez,Javier; Naranjo Rodríguez,Sandra; Guevara Pérez,Emma;
Revista M??dica Electr?3nica , 2010,
Abstract: high education in our country is immersed in a wave of changes, from which medical sciences do not escape. the matter biological agents, as one of those integrating the medical specialty, is not free of lacks in adequate informatics media to assume the teaching-learning process in the current conditions. to solve this limiter, the teaching staff of this matter at matanzas medical university proposed themselves to integrate its program to hyperenvironments rendering to each of the themes conforming it, didactically integrating all the contents. the first developed hyperenvironment was medical virology. this investigation has two stages, divided in two phases each of them. the first stage was building the hyperenvironment, considering a diagnostic phase and a designing one. the hyperenvironment makes easier not only information transference, but also the organization to access, the collaborative organization and the students' independent activity, according to the universalization didactical exigencies. in the second stage, we made a didactical proposition to introduce the designed hyperenvironment in the teaching-learning process of the matter and made an appraisal of its introduction after being used during an academic year.
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.
Aproximación a la Diabetes Mellitus Oculta en un Servicio de Urgencias Hospitalario
Bravo Morales,Macarena; Rodríguez del Río,Francisco Javier; Pérez Jiménez,ángeles; León Martín,A. Alberto; Giralt Mui?a,Patricio;
Revista Clínica de Medicina de Familia , 2009, DOI: 10.4321/S1699-695X2009000100004
Abstract: objectives. to determine the prevalence of hidden diabetes in patients presenting with hyperglycaemia at a hospital emergency department. study design. cross-sectional descriptive study (prevalence) studio. setting. hospital emergency department. participants. patients over 20 years who attended the emergency department of the hospital general de ciudad real during 2007 with plasma glucose levels over 140 mg/dl. the total number of patients with glucose levels higher than 140 mg/dl was 4,559. main measurements. socio-demographic variables and cause of hyperglycaemia. results. the mean age of patients with glucose levels greater than or equal to 140 mg/dl was 68.5 years ± 13.8 sd, 50% were less than 71 years. the mean in the sample was 75 years and 52.2% (2.381) were men. the causes of hyperglycaemia were: known diabetes mellitus (75.1% of the sample, 3,423 patients), hidden diabetes mellitus (5.3% of the sample, 240 patients), hyperglycaemia secondary to other causes (19.7% of sample, 896 patients). therefore, the prevalence of hidden diabetes in our population was 5.3% (95% ci: 4.3 - 5.6%). of those patients with known diabetes, 10.3% had type 1 (351 patients) and 89.7% had type 2 (3,072 patients). in 18% of cases, hyperglycaemia was secondary to corticoid treatment (238 patients), in 3% to a biliar-pancreatic problem (28 patients), in 32% to isolated hyperglycaemia related to the stress of their current illness (291 patients) and in 15% to glucose intolerance (131 patients). conclusions. the prevalence of hidden diabetes is comparable to that found in similar studies. hidden diabetes is confirmed as being a healthcare problem of epidemiological weight (5.3% of our patients) which could have serious socio-healthcare repercussions.
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