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Search Results: 1 - 10 of 488677 matches for " Calderón Sáenz Eduardo "
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Hallazgo de Pelliciera Rhizophorae Triana & Planchon (Theaceae) en la Costa del Atlántico, con observaciones taxonómicas y biogeográficas preliminares Hallazgo de Pelliciera Rhizophorae Triana & Planchon (Theaceae) en la Costa del Atlántico, con observaciones taxonómicas y biogeográficas preliminares
Calderón Sáenz Eduardo
Acta Biológica Colombiana , 1982,
Abstract: Pelliciera rhizopharae Triana & Planchon es reported for the first time in the Atlantic Coast. This species has been considered so far as an endemics in the tropical American Pacific coast. Some biogeographical and taxonomic observations are included, as well as a description of the material found. Se reporta por primera vez el "mangle pi uelo" Pelliciera rhizophorae Triana & Planchon para la costa del Atlántico. Esta especie es considerada hasta la fecha endémica en la costa tropical del Pacifico americana. Acompa an el reporte algunas observaciones de carácter biogeográfico y taxonómico, así como una descripción de los ejemplares encontrados.
Tasa de Colonización del Streptococcus Agalactiae en Gestantes y Neonatos, Hospital de las Mujeres Dr Adolfo Carit Eva
Delgado-Picado,Eugenia; Sáenz-Sánchez,Carmen; Calderón-Zú?iga,Alberto;
Revista Costarricense de Ciencias Médicas , 2004,
Abstract: since 1970, streptococcus agalactiae or group b streptococcus (egb), was added to the list of important germs due to its capacity to produce neonatal sepsis, infections in pregnants and inmunocompromised adults. in our environment do not exist data about their incidence. its detection in pregnant women before the delivery is fundamental in order to prevent the vertical transmission to the newborns. this investigation has as objectives: estimate the rates of colonization in newborn and pregnants in different anatomical sites, and also urge doctors and microbiologists to take consciousness of its isolation and clinical importance. since june 16th 2002 until march 15th 2004, in the hospital de las mujeres, 2952 urine cultures, 667 blood cultures, 383 vaginal cultures in different gestacional ages, 53 cultures of surgical wounds and 7 cultures of amniotic fluid were analyzed. conventional methods for the isolation of facultative aerobic and anaerobic bacteria were used; the identification and antimicrobial susceptibility test were carried out by microscan automatized method. egb was isolated in 43 occasions, 95.3% (41 cases) in obstetrics and 4.7% in neonatology, 5.4% (22 cases) in urinary tract, 3.7% (14 cases) in vaginal tract, 5.7% (3 cases) in skin and soft tissues, 28.5% (2 cases) in amniotic fluid, and 0.3% (2 cases) in blood (1.7 newborns/10.000 live births). the low incidence in vaginal cultures was due to the non use of additional culture media that can detect the microorganism in small amounts. the screening cultures were not taking on to 35-37 weeks of gestation; neither was it taken without especulum from the entrance from the vagina and/or anorectum zone. the incidence in urine tract would increase if egb were reported > 10.000 ufc/ml in blood media. this is important because its presence in urine implies high density of vaginal tract colonization. the so low incidence of neonatal infection implied the presence of few virulent germs
Complexity and Algorithms for Euler Characteristic of Simplicial Complexes
Bjarke Hammersholt Roune,Eduardo Sáenz de Cabezón
Mathematics , 2011,
Abstract: We consider the problem of computing the Euler characteristic of an abstract simplicial complex given by its vertices and facets. We show that this problem is #P-complete and present two new practical algorithms for computing Euler characteristic. The two new algorithms are derived using combinatorial commutative algebra and we also give a second description of them that requires no algebra. We present experiments showing that the two new algorithms can be implemented to be faster than previous Euler characteristic implementations by a large margin.
Impacto y beneficio de la simulación clínica en el desarrollo de las competencias psicomotoras en anestesia: un ensayo clínico aleatorio doble ciego
Luz María Gómez,Mauricio Calderón,Ximena Sáenz,Gustavo Reyes
Revista Colombiana de Anestesiología , 2008,
Abstract: Introducción. La atención médica apropiada de pacientes en condiciones de urgencia, requiere de competencias cognitivas y psicomotoras relacionadas con el manejo de la vía aérea y de la canalización venosa. La simulación surge en las últimas décadas como una herramienta pedagógica que complementa la formación tradicional.Objetivo. Comparar la eficacia, la curva de aprendizaje y las complicaciones en la realización de la intubación orotraqueal, la aplicación de máscara laríngea y la canalización venosa hecha por estudiantes que basan su aprendizaje en la simulación, y estudiantes cuyo proceso se centra en la práctica clínica.metodología. Ensayo clínico aleatorio, doble ciego; 29 estudiantes de cuarto a o de medicina recibieron instrucción teórica apoyada en una multimedia sobre los procedimientos estudiados; posteriormente, en forma aleatoria, fueron distribuidos en dos grupos, un grupo de simulación que recibió entrenamiento en maniquíes hasta completar la competencia, y un grupo control que procedió al manejo clínico. Se utilizó un instrumento de evaluación con puntaje máximo de 200; se compararon los promedios de ambos grupos en cuanto a eficacia, curva de aprendizaje y complicaciones.Resultados. No se encontraron diferencias significativas en las evaluaciones en la intubación orotraqueal, pero sí en la fase de preparación para la misma; el grupo de simulación obtuvo mejores calificaciones que el grupo control en la colocación de una máscara laríngea; no se observaron diferencias significativas entre los grupos en la canalización venosa. El porcentaje de complicaciones no mostró diferencias entre los grupos. Conclusiones. La instrucción basada en la simulación obtuvo mejores calificaciones que la instrucción basada en la clínica para la colocación de la máscara laríngea, pero no para la intubación traqueal ni la canalización venosa. Introduction. Proper medical care for patients in emergency conditions, requires cognitive and psychomotor skills related to the management of the airway and vein channeling. Simulations surge in recent decades as a pedagogical tool that complements traditional training.Objectives: to compare the effectiveness, learning curve and complications in conducting orotracheal intubation, insertion of laryngeal mask and vein channeling done by students who base their learning in the simulation, and students whose process focuses on clinical practice.methodology: randomized doubleblind, 29 fourth year medicine students received a process of theoretical instruction supported by multimedia on the procedures studied thereafter at rando
Modelos de acoplamiento para el cálculo de tensiones inducidas en líneas de distribución
Juan C. Medina Marín,Eduardo Marlés Sáenz,Ferley Castro Aranda
El Hombre y la Máquina , 2010,
Abstract: En este artículo se presentan los modelos de acoplamiento más utilizados en el cálculo de tensiones inducidas por descargas atmosféricas cercanas a líneas aéreas de distribución. Se muestra una clasificación que considera el tipo de modelo y el dominio en el que se encuentra planteado. Asimismo se comparan los modelos presentados mediante el uso de índices que hacen referencia a las características más relevantes de los mismos. Finalmente se plantea un diagrama de decisiones que permita elegir el modelo más adecuado según el caso de estudio.
The algebraic method in tree percolation
Fatemeh Mohammadi,Eduardo Sáenz-de-Cabezón,Henry P. Wynn
Mathematics , 2015,
Abstract: We apply the methods of algebraic reliability to the study of percolation on trees. To a complete $k$-ary tree $T_{k,n}$ of depth $n$ we assign a monomial ideal $I_{k,n}$ on $\sum_{i=1}^n k^i$ variables and $k^n$ minimal monomial generators. We give explicit recursive formulae for the Betti numbers of $I_{k,n}$ and their Hilbert series, which allow us to study explicitly percolation on $T_{k,n}$. We study bounds on this percolation and study its asymptotical behavior with the mentioned commutative algebra techniques.
Types of signature analysis in reliability based on Hilbert series
Fatemeh Mohammadi,Eduardo Sáenz-de-Cabezón,Henry P. Wynn
Mathematics , 2015,
Abstract: The present paper studies multiple failure and signature analysis of coherent systems using the theory of monomial ideals. While system reliability has been studied using Hilbert series of monomial ideals, this is not enough to understand in a deeper sense the ideal structure features that reflect the behavior of the system under multiple simultaneous failures and signature. Therefore, we introduce the lcm-filtration of a monomial ideal, and we study the Hilbert series and resolutions of the corresponding ideals. Given a monomial ideal, we explicitly compute the resolutions for all ideals in the associated lcm-filtration, and we apply this to study coherent systems. Some computational results are shown in examples to demonstrate the usefulness of this approach and the computational issues that arise. We also study the failure distribution from a statistical point of view by means of the algebraic tools described.
Modelo de ense?anza de las habilidades psicomotoras básicas en anestesia para estudiantes de ciencias de la salud: sistematización de una experiencia
Ramírez,Lizceth Jazmín; Moreno,Myriam Andrea; Gartdner,Lorena; Gómez,Luz María; Calderón,Mauricio; Sáenz,Ximena; Reyes,Gustavo; Jaramillo,Jaime;
Revista Colombiana de Anestesiología , 2008,
Abstract: this type of qualitative research, proposes a pedagogical model designed to facilitate teaching and lear-ning processes of the following basic psychomotor skills in anesthesia: orotracheal intubation, placement of laryngeal mask and channeling vein in children and adults. the model was designed through the adoption of some theories and designs proposed in the literature, the systematization of teaching experience, and leading tests of the instructions to students who perform hospital practices. the general objectives set for the systematization were: first, systematize the experience of building a pe-dagogical model aimed at facilitating the process of teaching and learning of psychomotor skills in basic anesthesia. second, help improve the qualifcation of the practice of anesthesiologists and educators in anes-thesia, upon recognition of knowledge of an expert team of anesthesiologists and teachers in the area. the results of the systematization were: first, the description of the more relevant assumptions used for the design of an instructive teaching tool of psychomotor skills. second, proposing a method for teaching these skills and developing a tool for evaluating the students’ psychomotor skills. the conclusion of the systematization was: first, the teaching of psychomotor skills can be based on as-sumptions, theories and models defned in the literature in a synergistic manner. second, the teaching of psychomotor skills requires coherent planning and structuring, given that these competencies are considered as "producing capabilities." and third, instructional evaluation should consider both the processes and results, to achieve greater input from the processes of learning and better interaction between master and apprentice.
Impacto y beneficio de la simulación clínica en el desarrollo de las competencias psicomotoras en anestesia: un ensayo clínico aleatorio doble ciego
Gómez,Luz María; Calderón,Mauricio; Sáenz,Ximena; Reyes,Gustavo; Moreno,Myriam Andrea; Ramírez,Lizceth Jazmín; Gartdner,Lorena; Jaramillo,Jaime;
Revista Colombiana de Anestesiología , 2008,
Abstract: introduction. proper medical care for patients in emergency conditions, requires cognitive and psychomotor skills related to the management of the airway and vein channeling. simulations surge in recent decades as a pedagogical tool that complements traditional training.objectives: to compare the effectiveness, learning curve and complications in conducting orotracheal intubation, insertion of laryngeal mask and vein channeling done by students who base their learning in the simulation, and students whose process focuses on clinical practice.methodology: randomized doubleblind, 29 fourth year medicine students received a process of theoretical instruction supported by multimedia on the procedures studied thereafter at random. students were divided into two groups. a frst group that received training in simulation mannequins until the complete jurisdiction and a second group of control which proceeded to clinical management. an assessment tool with maximum score of 200 was used by the evaluators; averages were compared among the two groups in terms of effectiveness, learning curve, and complications.results: here were no signifcant differences in the orotracheal intubation assessments, however, signifcant differences were revealed while preparing the same, where the simulation group got better grades than the control group, in the insertion of a laryngeal mask. no signifcant differences were found between groups, in vein channeling procedures. the rate of complications did not differ between groups either. conclusions: the group instruction based on simulation got better grades that instruction based on just clinical knowledge for the insertion of laryngeal mask study, but not for tracheal intubation or vein channeling studies.
Las redes de cubanos, norteamericanos y colombianos en el narcotráfico en Miami durante los a?os sesenta
Sáenz Rovner,Eduardo;
Innovar , 2008,
Abstract: using abundant unedited information taken from several north-american and periodic press files, especially from southern florida, this article has studied the development of cuban, north-american and colombian narcotrafficking networks in miami during the 1960s. the article also covers the mass entry of cubans to southern florida following the cuban revolution, their economic performance and the political climate in miami at the time. the role of cubans and north-american traffickers in importing and distributing cocaine, marihuana and heroin is analysed. regarding colombians, their role in cocaine and marihuana trafficking at the start of the 1960s is studied and, more importantly, at the end of this decade. differently to cuban and north-american narcotraffickers, most colombian traffickers do not live in the usa; they simply enter the country to engage in their illegal activities.
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