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Search Results: 1 - 10 of 130394 matches for " Alberto Barrientos Casta?o "
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Valores de referencia del electrorretinograma en el laboratorio de electrofisiología visual del Centro Internacional de Retinosis Pigmentaria "Camilo Cienfuegos Reference values of the electroretinogram in the visual electrophysiology laboratory from the "Camilo Cienfuegos" Pigmentary Retinosis International Center
Alberto Barrientos Castao,Maritza Herrera Mora,Obel García Báez,Milagros Sierra Hernández
Revista Cubana de Oftalmolog?-a , 2011,
Abstract: OBJETIVO: Obtener los valores de referencia del electrorretinograma diferenciado de conos y bastones para el laboratorio de electrofisiología visual de la clínica "Camilo Cienfuegos". MéTODOS: Se seleccionaron 50 individuos sanos al azar en la clínica "Camilo Cienfuegos", a quienes se les realizó el electrorretinograma según los parámetros planteados por el comité internacional para la estandarización, de la Sociedad Internacional para la Electrofisiología Clínica de la Visión. Se midieron las amplitudes y tiempos implícitos de las principales ondas en las cinco respuestas básicas y una opcional. RESULTADOS: Se obtuvieron las cinco respuestas básicas con morfología similar a la planteada por otros autores. En la respuesta de bastones la onda "b" estuvo entre 72 y 89 ms con una amplitud entre 128 y 380 μv. Se obtuvo una respuesta combinada con ondas "a" y "b" desdobladas. Se registraron potenciales oscilatorios con 4 y 5 componentes. Los valores y morfología de las ondas en la respuesta de conos y el flicker se corresponden con la reportada por otros autores. CONCLUSIONES: Se obtuvieron los valores de referencia del electrorretinograma para este laboratorio según estandarización internacional, con morfología, amplitud y tiempos implícitos similar a los obtenidos por otros autores. OBJECTIVE: To obtain the normal reference values of cone-rod standard electroretinogram in electrophysiology visual department of Camilo Cienfuegos Hospital. METHODS: 50 healthy individuals were studied and submitted to standard electroretinogram in electrophysiology visual department of "Camilo Cienfuegos" Hospital in Havana. We performed the electroretinogram according to the parameters of the standard committee of the International Society for Clinical Electrophysiology of Vision. The amplitud and implicit times of the main waves were measured in the five basic and an additional optional scotopic reponses. RESULTS: The five basic responses were obtained with similar morphology than other authors. In the rod response the b wave was between 72 and 89 ms with an amplitude between 128 and 380 μv. A combined response was obtained with "a" and "b" unfold wave. Scotopic oscillatory potentials with 4 and 5 components was obtained. The values and morphology of the waves in cones and flicker responses were similar that one reported by other authors. CONCLUSIONS: The normal reference values of the main clinical indicators of electroretinogram were obtained according to the standardized methodologies for our laboratory.
Valores de referencia del electrooculograma Reference values for electrooculography
Alberto Barrientos Castao,Maritza Herrera Mora,Obel García Báez,Milagros Sierra Hernández
Revista Cubana de Investigaciones Biom??dicas , 2012,
Abstract: Objetivo: obtener los valores de referencia del electrooculograma según los patrones normados por el Comité de Estandarización de la Sociedad Internacional para la Electrofisiología Clínica de la Visión (ISCEV). Métodos: se seleccionaron al azar 27 individuos sanos entre los trabajadores del Centro Internacional de Retinosis Pigmentaria "Camilo Cienfuegos". Se les realizó el electrooculograma según los parámetros planteados por el Comité de Estandarización de la ISCEV. Se midieron los valores de los principales indicadores de importancia clínica del electrooculograma (índice de Arden, la amplitud de pico de oscuridad y el tiempo de aparición del pico de luz en la fase de claridad). Resultados: los valores más bajos de amplitud del potencial estuvieron entre 388 y 882 μv en la fase de oscuridad. El pico de luz se obtuvo entre los 9 y los 10 min y durante esta fase el potencial alcanzó una amplitud entre 808 y 1 963 μv; esta variabilidad de las amplitudes puede estar relacionada con que la prueba se realizó sin midriasis pupilar. El valor de referencia del índice de Arden obtenido fue de 1,55 a 2,87. Conclusiones: se obtuvieron los valores de referencia de nuestro laboratorio para los principales indicadores de utilidad clínica del electrooculograma siguiendo metodologías estandarizadas. Objective: obtain electrooculographic reference values based on the patterns set by the Standardization Committee of the International Society for Clinical Electrophysiology of Vision (ISCEV). Methods: twenty-seven healthy individuals were selected at random among employees at "Camilo Cienfuegos" International Center for Retinitis Pigmentosa. An electrooculogram was performed on them following the parameters set by ISCEV Standardization Committee. A measurement was made of the main clinically important electrooculographic indicators (Arden index, dark peak amplitude and light peak emergence time in the light phase). Results: the lowest amplitude values of the potential ranged between 388 and 882 μv in the dark phase. The light peak was obtained between 9 and 10 minutes, and during this phase the potential reached an amplitude ranging between 808 and 1 963 μv. This amplitude variability may be related to the fact that the test was conducted without pupillary mydriasis. The reference value obtained for Arden index was 1,55 to 2,87. Conclusions: following standardized methodologies, reference values were obtained for the main clinically useful electrooculographic indicators. These indicators will be of use in our laboratory.
Valores de referencia del electrorretinograma en el laboratorio de electrofisiología visual del Centro Internacional de Retinosis Pigmentaria "Camilo Cienfuegos
Barrientos Castao,Alberto; Herrera Mora,Maritza; García Báez,Obel; Sierra Hernández,Milagros; Pérez de la Rosa,Odalis;
Revista Cubana de Oftalmolog?-a , 2011,
Abstract: objective: to obtain the normal reference values of cone-rod standard electroretinogram in electrophysiology visual department of camilo cienfuegos hospital. methods: 50 healthy individuals were studied and submitted to standard electroretinogram in electrophysiology visual department of "camilo cienfuegos" hospital in havana. we performed the electroretinogram according to the parameters of the standard committee of the international society for clinical electrophysiology of vision. the amplitud and implicit times of the main waves were measured in the five basic and an additional optional scotopic reponses. results: the five basic responses were obtained with similar morphology than other authors. in the rod response the ?b? wave was between 72 and 89 ms with an amplitude between 128 and 380 μv. a combined response was obtained with "a" and "b" unfold wave. scotopic oscillatory potentials with 4 and 5 components was obtained. the values and morphology of the waves in cones and flicker responses were similar that one reported by other authors. conclusions: the normal reference values of the main clinical indicators of electroretinogram were obtained according to the standardized methodologies for our laboratory.
Two Mayer-Vietoris spectral sequences for $\mathcal{D}$-modules
Alberto Castao Domínguez
Mathematics , 2013,
Abstract: We provide two Mayer-Vietoris-like spectral sequences related to the localization over the complement of a closed subvariety of an algebraic variety by using techniques from $\mathcal{D}$-modules and homological algebra. We also give, as an application of the previous, a method to calculate the cohomology of the complement of any arrangement of hyperplanes over an algebraically closed field of characteristic zero.
Dwork families and $\mathcal{D}$-modules
Alberto Castao Domínguez
Mathematics , 2015,
Abstract: A Dwork family is a one-parameter monomial deformation of a Fermat hypersurface. In this paper we compute algebraically the invariant part of its Gauss-Manin cohomology under the action of certain subgroup of automorphisms. To achieve that goal we use the algebraic theory of $\mathcal{D}$-modules, especially one-dimensional hypergeometric ones.
Exponents of some one-dimensional Gauss-Manin cohomologies
Alberto Castao Domínguez
Mathematics , 2015,
Abstract: In this note we prove a result about the exponents of a particular kind of one-dimensional Gauss-Manin systems and the vanishing of the cohomologies of certain Koszul complex. This can be related to a more general family of such a complex of $\mathcal{D}$-modules. As an application, we calculate a set of possible exponents of the Gauss-Manin system of some arrangements of hyperplanes in general position, relevant to Dwork families.
Incorporación de Personas Adultas a los Estudios Universitarios: Aprendizaje Permanente para Arquitectos Técnicos
Castao,Enrique M; Garín,Alberto;
Formación universitaria , 2012, DOI: 10.4067/S0718-50062012000300003
Abstract: this article describes and analyzes the experiences at the universidad europea de madrid of some academic programs specifically designed for professional workers, with schedules compatibles with their working hours, within the concept known as “permanent learning”. the situation of technical architects in spain is especially analyzed, in which these technical level professionals want to become architects. the reasons that encourage them to return to college and the various difficulties they encounter are discussed. besides describing the specific experience, the paper presents an analysis of literature information regarding adult education in similar studies and the results, from the skills training perspective, are discussed. several conclusions related to the students, the instructors, the teaching-learning system and the skill training are drawn.
Péptidos antimicrobianos
Téllez,Germán Alberto; Castao,Jhon Carlos;
Infectio , 2010,
Abstract: the antimicrobial peptides (amp) are the effectors molecules of the innate immune system, finding groups of this kind of substances in almost all living organisms from bacteria to mammals. they are a family of versatile substances with complexes action mechanisms in the pathogen they interact with membrane, dna synthesis and protein synthesis and folding, and also with the host showing immunomodulatory functions in wound healing and inflammation process. even though the generation of resistance to the amp is lower compare with conventional antibiotics there are resistance mechanism already describe to this kind of substances like degradation by proteases, releasing of inhibitory substances or conformational changes in the external membrane of the pathogen. actually the study of this group of substances has make them see as potential tools for clinical use helping to counteract the problem of antibiotic resistance, but even great progress had been made in this field there still exist some controversial issues for future study.
Péptidos antimicrobianos Antimicrobial peptides
Germán Alberto Téllez,Jhon Carlos Castao
Infectio , 2010,
Abstract: Resumen Los péptidos antimicrobianos son las moléculas efectoras del sistema inmune innato, cuyas familias se encuentran en casi todos los organismos, desde bacterias hasta mamíferos. Son una familia de sustancias polifacéticas con complejos mecanismos de acción relacionados con la interacción con el patógeno a través de su membrana, o afectando blancos internos, como la replicación del ADN y la síntesis de proteínas, e interactuando con el huésped con funciones inmunomoduladoras de la regulación del proceso inflamatorio y de la cicatrización. Aunque la generación de resistencia a los péptidos antimicrobianos es mucho menor si se compara con la generada por los antibióticos convencionales, existen mecanismos de resistencia ya descritos, como la degradación por proteasas, la liberación de proteínas inhibidoras o los cambios en la conformación de la membrana externa del patógeno. El estudio de estas sustancias ha permitido evidenciar sus usos potenciales en el ámbito clínico para contrarrestar los inconvenientes de la resistencia a los antibióticos; sin embargo, a pesar de los grandes avances logrados en este campo, aún quedan puntos controversiales por dilucidar. The antimicrobial peptides (AMP) are the effectors molecules of the innate immune system, finding groups of this kind of substances in almost all living organisms from bacteria to mammals. They are a family of versatile substances with complexes action mechanisms in the pathogen they interact with membrane, DNA synthesis and protein synthesis and folding, and also with the host showing immunomodulatory functions in wound healing and inflammation process. Even though the generation of resistance to the AMP is lower compare with conventional antibiotics there are resistance mechanism already describe to this kind of substances like degradation by proteases, releasing of inhibitory substances or conformational changes in the external membrane of the pathogen. Actually the study of this group of substances has make them see as potential tools for clinical use helping to counteract the problem of antibiotic resistance, but even great progress had been made in this field there still exist some controversial issues for future study.
METODOLOGíA PARA EL DISE O DE CUARTOS LIMPIOS
JUAN CARLOS CASTAO SáNCHEZ,CARLOS ALBERTO OROZCO HINCAPIé
Scientia Et Technica , 2008,
Abstract: Este documento expone los conceptos básicos que se deben tener en cuenta en el desarrollo de cuartos limpios, presenta temas como clasificación de cuartos limpios, según normas técnicas europeas y americana, clases de cuartos limpios, se hace énfasis en las aplicaciones en la industria, consideraciones de dise o fundamentales como presurización, tiempos de recuperación, humedad temperatura, tipos de contaminación.
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