oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 270 )

2018 ( 505 )

2017 ( 498 )

2016 ( 784 )

Custom range...

Search Results: 1 - 10 of 322623 matches for " Víctor V.; González-Fabián "
All listed articles are free for downloading (OA Articles)
Page 1 /322623
Display every page Item
Chromoendoscopy with red phenol in the diagnosis of Helicobacter pylori infection Cromoendoscopia con rojo fenol en el diagnóstico de la infección por Helicobacter pylori
ctor Rubén Hernández-Garcés,Víctor V. Castellanos-González,Licet González-Fabián,Mirtha Infante-Velázquez
Revista Espa?ola de Enfermedades Digestivas , 2012,
Abstract: An analytic study to validate a diagnostic test was carried out at the Institute of Gastroenterology in Havana, Cuba in adult patients of both sexes in whom chromoendoscopy was carried out with red phenol at 0.1% over the gastric mucosa for the detection of Helicobacter pylori infection between November 2008 and December 2010. The staining with red phenol at 0.1% is included in the invasive tests for the diagnosis of Helicobacter pylori infection and of the reactive techniques. The sensibility of red phenol dye in the diagnosis of Helicobacter pylori infection in the patients studied was of 72.6% with a confidence interval (C.I.) of 95% (64.9 to 79.2%) and a specificity of 75.5% C.I. 95% (61.9 to 85.4%). The positive predictive value was of 89.8% C.I. 95% (83.1 to 94.1%) and the negative predictive value of 48.1% C.I. 95% (37.3 to 59.0%). The proportion of false positives was of 24.5% C.I. 95% (14.6 to 38.1%) and the proportion of false negatives was of 27.4% C.I. 95% (20.8 to 35.1%). The diagnostic accuracy of the dye on the patients studied was 73.3% C.I. 95% (66.7 to 79.0%). The diagnostic odds ratio was 8.17 C.I. 95% (3.88 to 17.23), the J Youden ratio of 0.5 and the Kappa coefficient of 0.40 C.I. 95% (0.27 to 0.54). The staining dye with red phenol at 0.1% resulted in a useful method in the diagnosis of Helicobacter pylori infection in the gastric mucosa,it can be applied in our environment and has multiple advantages (topographic localization, avoids contamination and fast and immediate reading). Se realizó un estudio analítico de validación de prueba diagnóstica a pacientes adultos de ambos sexos, en el Instituto de Gastroenterología de La Habana. Cuba, a los cuales se les realizó cromoendoscopia con rojo fenol al 0,1% sobre la mucosa gástrica para la detección de infección por Helicobacter pylori, entre noviembre de 2008 y diciembre de 2010. La tinción con rojo fenol al 0,1% se encuentra dentro de las pruebas invasivas para la detección de la infección por H. pylori y de las llamadas técnicas reactivas. La sensibilidad de la tinción con rojo fenol en el diagnóstico de la infección por Helicobacter pylori en los pacientes estudiados fue del 72,6%. IC 95% (64,9 a 79,2%) y la especificidad del 75,5%. IC 95% (61,9 a 85.4%). El valor predictivo positivo fue del 89,8%. IC 95% (83,1 a 94,1%) y el valor predictivo negativo del 48,1%. IC 95% (37,3 a 59,0%). La proporción de falsos positivos fue de 24,5%. IC 95% (14,6 a 38,1%) y la proporción de falsos negativos de 27,4%. IC 95% (20,8 a 35,1%). La exactitud diagnóstica de la tinción en los pacientes estud
Chromoendoscopy with red phenol in the diagnosis of Helicobacter pylori infection
Hernández-Garcés,ctor Rubén; Castellanos-González,Víctor V.; González-Fabián,Licet; Infante-Velázquez,Mirtha; Pe?a,Kevin; Andrain-Sierra,Yudit;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000100002
Abstract: an analytic study to validate a diagnostic test was carried out at the institute of gastroenterology in havana, cuba in adult patients of both sexes in whom chromoendoscopy was carried out with red phenol at 0.1% over the gastric mucosa for the detection of helicobacter pylori infection between november 2008 and december 2010. the staining with red phenol at 0.1% is included in the invasive tests for the diagnosis of helicobacter pylori infection and of the reactive techniques. the sensibility of red phenol dye in the diagnosis of helicobacter pylori infection in the patients studied was of 72.6% with a confidence interval (c.i.) of 95% (64.9 to 79.2%) and a specificity of 75.5% c.i. 95% (61.9 to 85.4%). the positive predictive value was of 89.8% c.i. 95% (83.1 to 94.1%) and the negative predictive value of 48.1% c.i. 95% (37.3 to 59.0%). the proportion of false positives was of 24.5% c.i. 95% (14.6 to 38.1%) and the proportion of false negatives was of 27.4% c.i. 95% (20.8 to 35.1%). the diagnostic accuracy of the dye on the patients studied was 73.3% c.i. 95% (66.7 to 79.0%). the diagnostic odds ratio was 8.17 c.i. 95% (3.88 to 17.23), the j youden ratio of 0.5 and the kappa coefficient of 0.40 c.i. 95% (0.27 to 0.54). the staining dye with red phenol at 0.1% resulted in a useful method in the diagnosis of helicobacter pylori infection in the gastric mucosa,it can be applied in our environment and has multiple advantages (topographic localization, avoids contamination and fast and immediate reading).
Morfometría de especies de Trichogramma Westwood (Hymenoptera: Trichogrammatidae) de centros reproductores de México
GARCíA-GONZáLEZ, Fabián;GONZáLEZ-HERNáNDEZ, Alejandro;PINTO, Víctor Manuel;RAMíREZ-ALARCóN, Samuel;
Acta zoológica mexicana , 2009,
Abstract: the importance of trichogramma, as a biological control agent of crop pests, contrasts with the knowledge of his taxonomy in mexico, due to the lack of studies that show a suitable identity of the species that are mass reared and exist in native form in agricultural areas. the objective of this study was made a morphometric analysis of the trichogramma species mass rearing in mexico as a corroborated technique of determination based in morphology. the analysis of variance and mean comparisons by the duncan's test allowed separate t. pretiosum and t. exiguum from t. fuentesi and t. pintoi based on the longest funicular setae length of male antenna. with the intervoselar process length of male genitalia, it was possible to differentiate t. pretiosum and t. pintoi from t. fuentesi and t. exiguum. in the cluster analysis (hierarchic cluster analysis), the intervoselar process length allowed differentiate the four species referred.
Morfometría de especies de Trichogramma Westwood (Hymenoptera: Trichogrammatidae) de centros reproductores de México
Fabián GARCíA-GONZáLEZ,Alejandro GONZáLEZ-HERNáNDEZ,Víctor Manuel PINTO,Samuel RAMíREZ-ALARCóN
Acta zoológica mexicana , 2009,
Abstract: La importancia de Trichogramma como agente de control biológico de plagas contrasta con el conocimiento de su taxonomía en México, debido a que no existen estudios que muestren una adecuada identidad de las especies que se reproducen y existen en forma nativa en las áreas agrícolas. El objetivo de este estudio fue realizar un análisis morfométrico de las especies de Trichogramma reproducidas masivamente en México como técnica de corroboración de determinación de especies realizada en base a su morfología. El análisis de varianza y la comparación de medias por el método de Duncan permitieron separar a T. pretiosum y T. exiguum de T. fuentesi y T. pintoi con la longitud de la seta funicular más larga de la antena del macho. Con la longitud del proceso intervoselar de las genitalias de los machos fue posible diferenciar a T. pretiosum y T. pintoi de T. fuentesi y T. exiguum. En el análisis de grupos (cluster jerárquico), la longitud del proceso intervoselar de la genitalia permitió diferenciar las cuatro especies referidas.
Dos Enfoques en el Dise?o de un Observador Asintótico para un Proceso Fermentativo Descrito por Ecuaciones Diferenciales Parciales
Aguilar-Garnica,Efrén; Alcaraz-González,Víctor; González-álvarez,Víctor;
Información tecnológica , 2006, DOI: 10.4067/S0718-07642006000600008
Abstract: this paper presents two approaches for the design of an asymptotic observer for a fermentative process described by partial differential equations (pde). in the first approach, termed late lumping, the observer is designed for the pde model and then both the observer and the model are reduced to a set of ordinary differential equations (ode) by means of the orthogonal collocation method (ocm). in the second approach, termed early lumping, the pde model is initially reduced to an ode set by using the ocm and then the asymptotic observer is designed for the reduced model. the study demonstrates that by analyzing the estimation error dynamics for both design approaches, the dynamic behavior of the asymptotic observer is fully independent of the design approach used.
Dos Enfoques en el Dise o de un Observador Asintótico para un Proceso Fermentativo Descrito por Ecuaciones Diferenciales Parciales Two Approaches in the Design of an Asymptotic Observer for a Fermentative Process Described by Partial Differential Equations
Efrén Aguilar-Garnica,Víctor Alcaraz-González,Víctor González-álvarez
Información Tecnológica , 2006,
Abstract: En este artículo, se presentan dos enfoques de dise o de un observador asintótico para un sistema fermentativo descrito por ecuaciones diferenciales parciales (EDP). En el primer enfoque, denominado reducción posterior, se dise a el observador directamente sobre el modelo en EDP y después, tanto el modelo como el observador, son reducidos a un conjunto de ecuaciones diferenciales ordinarias (EDO) mediante el Método de Colocación Ortogonal (MCO). En el segundo enfoque, denominado reducción temprana, el modelo en EDP, es inicialmente reducido a EDO, usando también el MCO y luego, el observador asintótico es dise ado para el modelo reducido. El estudio muestra, mediante un análisis de la dinámica del error de estimación para ambos enfoques, que el comportamiento dinámico del observador asintótico es independiente del enfoque de dise o utilizado. This paper presents two approaches for the design of an asymptotic observer for a fermentative process described by partial differential equations (PDE). In the first approach, termed late lumping, the observer is designed for the PDE model and then both the observer and the model are reduced to a set of ordinary differential equations (ODE) by means of the Orthogonal Collocation Method (OCM). In the second approach, termed early lumping, the PDE model is initially reduced to an ODE set by using the OCM and then the asymptotic observer is designed for the reduced model. The study demonstrates that by analyzing the estimation error dynamics for both design approaches, the dynamic behavior of the asymptotic observer is fully independent of the design approach used.
Intrinsic Motives of Autonomy, Self-Efficacy, and Satisfaction Associated with Two Instances of Sustainable Behavior: Frugality and Equity  [PDF]
Víctor Corral-Verdugo, Daniel González-Lomelí, Marisol Rascón-Cruz, Víctor O. Corral-Frías
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.75068
Abstract:

This paper explores the relationship between sustainable behavior, indicated by frugal and equitable actions, and three intrinsic motives: satisfaction, autonomy and self-efficacy. One-hundred and seventy-three undergraduates at a Mexican university responded to a questionnaire investigating their sustainable actions and the intrinsic repercussions derived from those actions. Using structural equations, a model is specified and tested, which reveals the presence of a higher-order factor (sustainable behavior) subjacent to a high and significant covariance between frugal and equitable behaviors. The resulting higher-order-factor, in turn, significantly predicts the report of feelings of satisfaction, autonomy, and self-efficacy. These findings are in line with the idea that sustainable behavior is to a good extent self-determined through the operation of intrinsic consequences, which instigate people’s pro-social and pro-environmental actions.

Evaluación de la seroprotección contra sarampión, rubéola y hepatitis B en ni os menores de cinco a os del Perú, 2011 Evaluation of the seroprotection against measles, rubella and hepatitis B in children under 5 years of age in Peru, 2011
Víctor Fiestas Solórzano,Marco Gonzáles Noriega,Fabián Fiestas,Edwin Cabezudo
Revista Peruana de Medicina Experimental y Salud Pública , 2012,
Abstract: Objetivos. Estimar la prevalencia de anticuerpos contra sarampión, rubéola y hepatitis B en ni os de 1 a 4 a os del Perú. Materiales y métodos. Se realizó una encuesta nacional basada en la aplicación de un cuestionario y obtención de muestra de sangre capilar en papel de filtro para el estudio de anticuerpos contra sarampión, rubéola y hepatitis B en ni os de 1 a 4 a os. Se utilizó un muestreo probabilístico, estratificado y multietápico con inferencia a nivel nacional y siete ámbitos de estudio: Lima metropolitana, resto de costa urbana, costa rural, sierra urbana, sierra rural, selva urbana y selva rural. Las muestras de sangre capilar fueron procesadas siguiendo protocolos estandarizados para la determinación de anticuerpos mediante técnica de ELISA utilizando reactivos comerciales. Resultados. Se encontró una prevalencia nacional de 91,6% (IC95%: 90,6-92,7%), 91,3% (IC 95%: 90,3-92,4%) y 95,9% (IC 95%: 95,0-96,8%) para anticuerpos contra sarampión, rubéola y hepatitis B respectivamente. No se evidenció diferencias significativas de las prevalencias entre los diferentes ámbitos de estudio y en los diferentes estratos socioeconómicos de los conglomerados. Conclusiones. En ni os de 1 a 4 a os se ha estimado una prevalencia nacional de anticuerpos contra sarampión y rubéola entre 90-93%, mientras que para anticuerpos contra hepatitis B (anti-HBsAg) entre 95-97%. Objectives. To estimate the prevalence of antibodies against measles, rubella and hepatitis B in children aged between 1 and 4 years in Peru. Materials and methods. A national survey was conducted based on a questionnaire and capillary blood sample taken on filter paper in order to study antibodies against measles, rubella and hepatitis B in children from 1 to 4 years of age. A stratified, multistage, probability sampling design was used to be representative at the national level and at level of seven ambits, including the Metropolitan Lima Area, the rest of the urban coast, the rural coast, the urban highlands, the rural highlands, the urban jungle and the rural jungle. The capillary blood samples were processed according to the standardized protocols for detection of antibodies using the ELISA technique and commercial reagents. Results. The survey showed a national prevalence of antibodies against measles, rubella and hepatitis B of 91.6% (CI 95%: 90.6%; 92.7%), 91.3% (CI 95%: 90.3%; 92.4%) and 95.9% (CI 95%: 95.0%; 96.8%) respectively. There was no evidence of significant differences in the prevalence among the ambits of study or among the socioeconomic strata of the conglomerates for any of
Intervención educativa sobre infecciones de transmisión sexual en adolescentes
Fernández Borbón,Hugo; Cuní González,Víctor;
Revista de Ciencias M??dicas de Pinar del R?-o , 2010,
Abstract: sexually transmitted infections (sti) in general; especially hiv/aids in adolescents and young population constitute a serious health problem. objective: to modify the level of knowledge about sexually transmitted infections. method: an educative intervention was conducted with adolescents in a school area at "hermanos cruz" outpatient clinic during june to november 2008. the target group was comprised of 452 adolescents, and a sample of 100 adolescents was taken at random through a simple raffle. including ages from 11 to 19 and the variables of sex, age, educational level and ways of obtaining information about sti, knowledge about sti and the confirmed knowledge they had about the topic. the process of information included the calculation of descriptive measures for the qualitative variables as for absolute and relative frequencies. results: female sex prevailed (54%) and the group of ages belonging to the late adolescence (57%); the majority of the adolescents were enrolled or had concluded the secondary studies (39%); it was verified that before applying the educative intervention the majority of the adolescents referred not to have knowledge about sti and the ways of prevention (79%); the quality of knowledge (verified) about sti regarding symptoms and ways of infection before the educative intervention was not correct in 60% of the adolescents. conclusions: after the application of the strategy a significant change of attitude and knowledge acquisition of the adolescents about sti was observed.
Intervención educativa sobre infecciones de transmisión sexual en adolescentes Educative intervention about sexually transmitted infections in adolescents
Hugo Fernández Borbón,Víctor Cuní González
Revista de Ciencias M??dicas de Pinar del R?-o , 2010,
Abstract: Introducción: Las infecciones de transmisión sexual en general y de manera especial el VIH/SIDA en los adolescentes y jóvenes constituyen un serio problema de salud. Objetivo: modificar nivel de conocimiento sobre las infecciones de transmisión sexual. Método: se realizó una intervención educativa en adolescentes de un área escolar del policlínico Hermanos Cruz, durante el período junio a noviembre de 2008. Del universo constituido por 452 adolescentes dispensarizados, se tomó una muestra de 100 adolescentes por el método aleatorio simple a través de un sorteo. Se incluyeron edades comprendidas entre 11 y 19 a os; se emplearon en el estudio las variables: el sexo, la edad, la escolaridad, la vía de adquisición de la información sobre ITS, conocimiento referido sobre ITS y el nivel de conocimiento comprobado. El procesamiento de la información incluyó cálculo de medidas descriptivas para las variables cualitativas como las frecuencias absolutas y relativas. Resultados: predominó el sexo femenino (54%) y el grupo de edad correspondiente a la adolescencia tardía (57%); la mayoría de los adolescentes cursaba o había concluido la ense anza secundaria (39%); se constató que antes de aplicar la intervención educativa la mayoría de los adolescentes referían no tener conocimientos sobre ITS y sus formas de prevención (79%); la calidad del conocimiento comprobado sobre ITS en cuanto a síntomas y vías de adquisición antes de la intervención educativa no fue adecuada en el (60%) de adolescentes. Conclusiones: después de aplicada la misma, se produjo un cambio significativo de los adolescentes con conocimiento comprobado adecuado sobre las ITS (90%). Sexually Transmitted Infections (STI) in general; especially HIV/AIDS in adolescents and young population constitute a serious health problem. Objective: to modify the level of knowledge about Sexually Transmitted Infections. Method: an educative intervention was conducted with adolescents in a school area at "Hermanos Cruz" Outpatient Clinic during June to November 2008. The target group was comprised of 452 adolescents, and a sample of 100 adolescents was taken at random through a simple raffle. Including ages from 11 to 19 and the variables of sex, age, educational level and ways of obtaining information about STI, knowledge about STI and the confirmed knowledge they had about the topic. The process of information included the calculation of descriptive measures for the qualitative variables as for absolute and relative frequencies. Results: female sex prevailed (54%) and the group of ages belonging to the late adole
Page 1 /322623
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.