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Search Results: 1 - 10 of 16668 matches for " Laura Herrera "
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3D Reconstruction with Spiral Computed Tomography in Choroidal Osteoma  [PDF]
Francisco Javier Ascaso, Laura Herrera, Laura Villén, Rafael Lasierra, Juan Iba?ez, Diana Pérez, José Angel Cristóbal
Open Journal of Ophthalmology (OJOph) , 2013, DOI: 10.4236/ojoph.2013.31002
Abstract:

Choroidal osteoma (CO) is a rare, ossifying benign tumor originated in the choroid that typically occurs in otherwise healthy young women (1,2). It is characterized by a yellowish, well demarcated lesion in the juxtapapillary or macular area. The diagnosis is clinical and can be confirmed with the use of fluorescein or indocyanine angiography, optical coherence tomography, computed tomography or magnetic resonance imaging. Choroidal neovascularization or subretinal fluid, the main causes for vision loss, can be treated with laser therapy, photodynamic therapy or intravitreal antivascular endothelial growth factor therapy. We present a case of choroidal osteoma, showing the role of the high resolution 3D spiral computed tomography.

Infección entérica por Campylobacter spp. en neonatos
Morales,Marco; Barzuna,Laura; Herrera,Marco Luis;
Revista Médica del Hospital Nacional de Ni?os Dr. Carlos Sáenz Herrera , 2003,
Abstract: en un periodo de 8 a?os, se encontraron siete casos de diarrea en neonatos producida por campylobacter spp., por lo que se hace énfasis en la importancia de estos hallazgos y se presenta la información obtenida al revisar los aspectos de laboratorio y clínicos de dichos pacientes.
Arboreal/Arbustive Component Associated to Livestock Systems in San Vicente del Caguán Municipality, Caquetá—Colombia  [PDF]
Ricardo Alberto Martínez Tovar, Laura Constanza Rojas Basto, Pablo Andrés Motta Delgado, Wilmer Herrera Valencia
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.812213
Abstract: Livestock is the most important economic activity in San Vicente del Caguán municipality, Caquetá department (located in Colombian Amazon region). Indeed, livestock activities have a big responsibility of Colombian Amazon forest deforestation for extensive grazing lands formation, causing soil degradation processes. However, recently some cattle ranchers have changed their thoughts to a sustainable production, applying different ecological strategies. So, application of silvopastoral systems, which is a very important mode of agroforestry, consists that in the same area and time, it can interact in the ecosystem stratums different species among grasses, shrubs, and trees. On this way, the objective of this study is to determine descriptively the arboreal/arbustive component associated to livestock systems, represented according to its uses in San Vicente del Caguán, Colombia. It was made through a direct survey to 13 smallholders in this municipality. As a result, mainly, we found 58 plant species (49 arboreal and nine arbustive, corresponding to 84.48% and 15.52%, respectively). Of these, 20 species had more than one use at a time. In fact, the shade was the use most common with 29 species, corresponding to 34.94% of total species (25 arboreal and just four arbustive, corresponding to 30.12% and 4.82%, respectively). On this way, according to smallholders surveyed, we can conclude that shade provided by trees integration in silvopastoral systems is for diminishing heat stress on cattle caused by enduring climate change of tropical, thus contributing to good welfare for animals.
Contaminación biológica intradomiciliaria y su relación con síntomas respiratorios indicativos de asma bronquial en preescolares de Bucaramanga, Colombia
Herrera,Astrid B; Rodríguez,Laura A; Niederbacher,Jürg;
Biomédica , 2011,
Abstract: introduction. indoorair pollution may play an important role in development and exacerbation of asthma in children. objective. the association between the presence of indoor biological contaminants and respiratory symptoms related to asthma was assessed in preschool children. materials and methods. this cross-sectional study was undertaken in bucaramanga, colombia, and included children <7 years of age living in two urban areas of with different levels of outdoor air pollution. the 678 children were an average of 3.5 years of age. respiratory symptoms indicative of asthma and indoor air pollutants were assessed by previously validated questionnaires.. biological samples potentially containing mites and fungi were collected by standardized laboratory methods. the log binomial regression model was used for multivariate analysis, using adjusted prevalence ratios (pr). results. the prevalence of asthmatic respiratory symptoms was 8.0%; (95% c.i: 5.6-9.6), without significant differences between the two areas. binomial model analysis showed that asthma symptoms were associated with mites (pr 1.78; 95% c.i. 1.0-3.0), acremonium sp (pr 6.24; 95 c.i.: 3.8-10.0) and a history of child pneumonia (pr 4.0; 95% c.i. 2.5-6.4), allergic rhinitis (pr 1.9; 95% c.i.: 1.2-3.1), prematurity (pr 3.4; 95% c.i. 1.8-6.5), parents with asthma (pr 2.6; 95% c.i. 1.4-5.0) and pet ownership (pr 0.4; 95% c.i. 0.2-0.9). conclusions. the indoor exposure to biological contaminants (dust mites and fungi), history of prematurity, pneumonia, rhinitis and family history of asthma increased the occurence of symptoms suggestive of asthma in young children.
Fronteras identitarias: jóvenes, género y procesos de cambio en Jonotla, Sierra Norte de Puebla
Valladares de la Cruz, Laura R.;Flores Herrera, Rita M.;
Alteridades , 2011,
Abstract: this article studies the complex framework of relations and phenomena which in turn has made visible the construction of a social actor in the indigenous communities: the male and female young, specifically in jonotla in the northern highland in puebla. we attempt to analyze the social and economic changes in jonotla through the women's experiences (especially the young ones) and in this way understand the framework where the important changes emerge in the multi-ethnic locality. we have searched to describe the processes in which new identity configurations (ethnic, from age and gender) emerge, and to show that the local-global articulation allows an understanding of the directions these processes of change are taking in the indigenous communities.
Deserción al programa de seguimiento de prematuros en el Hospital materno infantil "Ramón Sardá" de Buenos Aires (2004-2006)
Marina Tuduri,Mónica Brundi,Laura Kasten,Paola Herrera
Revista del Hospital Materno Infantil Ramón Sardá , 2011,
Abstract: Objetivo: Identificar factores asociados a la deserción del programa de seguimiento de recién nacidos prematuros menores de 1500 g al a o y dos a os de edad corregida. Material y método: Trabajo descriptivo, prospectivo y analítico. Se incluyeron todos los recién nacidos menores de 1500 g egresados de la unidad de terapia intensiva neonatal, nacidos entre el 01/01/2004 al 31/12/2006. Se excluyeron: ni os con malformaciones congénitas mayores, infecciones intrauterinas confirmadas, derivados por patología quirúrgica, o domiciliados a mas de100 km de distancia. Se definió deserción al a o de vida cuando no se cumplieron cuatro controles y a los dos a os cuando no se cumplieron dos controles entre los doce y veinticuatro meses de vida. Resultados: De 207 prematuros, al a o concurrieron 165 (79,5%) y desertaron 42 (20,5%), a los 2 a os concurrieron 124 (75,2%) y desertaron 42 (25,4%). Los factores estadísticamente significativos al a o de vida fueron: gemelaridad (p= 0,03) y familias monoparentales (p= 0,05). Conclusiones: Es necesario recrear estrategias para mejorar la adherencia de las familias de grupos vulnerables al programa de seguimiento por la implicancia que tiene ésta en el neurodesarrollo, la salud y educación a futuro.
Miscibilidad en Mezclas de Poli(Estireno-co-Anhídrido Maleico) y Poli(e-Caprolactona) (SMA/PCL)
Vittoria Balsamo,Laura M. Gouveia,Lenin Herrera,Estrella Laredo
Revista Latinoamericana de Metalurgia y Materiales , 2004,
Abstract: Dada la versatilidad de la Policaprolactona (PCL) para la elaboración de mezclas poliméricas, éste polímero fue mezclado con un componente amorfo, el Poli(Estireno-co-Anhídrido Maleico) (SMA) con 14% p/p de anhídrido maleico (SMA14). Se encontró que el sistema SMA14/PCL es miscible en la zona amorfa en todo el rango de composiciones, demostrándose mediante Espectroscopia Infrarroja por Transformada de Fourier y Resonancia Magnética Nuclear que tal miscibilidad es producto de interacciones físicas y no de reacciones químicas entre los componentes. El comportamiento térmico de este sistema depende de la composición, siendo posible la obtención de mezclas que cristalizan durante el enfriamiento, mezclas que no cristalizan y mezclas que cristalizan en frío. La miscibilidad se refleja en la depresión de la temperatura de fusión y cristalización de la fracción de PCL a medida que se incrementa el contenido de SMA14, y la presencia de una única Tg ubicada a temperaturas intermedias a las de los polímeros puros, las cuales se ajustan bien a lo predicho por la ecuación de Fox, especialmente a altos contenidos de SMA14. Los resultados morfológicos mostraron la formación de esferulitas con banding sin evidencias de segregación interesferulítica del componente amorfo producto del mezclado de los componentes a nivel molecular. Due to the versatility of the Polycaprolactone (PCL) for the preparation of polymer blends, we blended it with an amorphous component, Poly(Styrene-co-Maleic Anhydride) (SMA) containing 14% wt of maleic anhydride. We found that the polymer blend system SMA14/PCL is miscible in the amorphous region in the whole composition range. It was demonstrated through Fourier Transformed Infrared Spectroscopy and Nuclear Magnetic Resonance that such miscibility results from physical interactions and not from chemical reactions between the components. The thermal behaviour of this system depends on composition, with a variety of results from blends that crystallize on cooling, blends that do not crystallize to blends that cold-crystallize. The miscibility leads to a depression of the melting and crystallization temperatures of the PCL fraction as the SMA14 content increases. The existence of a single Tg located at temperatures in between those of the neat polymers evidences the miscibility on a macroscopic scale. These temperatures can be well predicted by using the Fox equation, especially for high SMA14 contents. The morphological results showed the formation of banded spherulites without interspherulitic segregation of the amorphous component as a resul
Biological pollution and its relationship with respiratory symptoms indicative of asthma, Bucaramanga, Colombia Contaminación biológica intradomiciliaria y su relación con síntomas respiratorios indicativos de asma bronquial en preescolares de Bucaramanga, Colombia
Astrid Berena Herrera,Laura A. Rodríguez,Jürg Niederbacher
Biomédica , 2011,
Abstract: Introduction. Indoor air pollution may play an important role in development and exacerbation of asthma in children. Objective. The association between the presence of indoor biological contaminants and respiratory symptoms related to asthma was assessed in preschool children. Materials and methods. This cross-sectional study was undertaken in Bucaramanga, Colombia, and included children <7 years of age living in two urban areas of with different levels of outdoor air pollution. The 678 children were an average of 3.5 years of age. Respiratory symptoms indicative of asthma and indoor air pollutants were assessed by previously validated questionnaires.. Biological samples potentially containing mites and fungi were collected by standardized laboratory methods. The log binomial regression model was used for multivariate analysis, using adjusted prevalence ratios (PR). Results. The prevalence of asthmatic respiratory symptoms was 8.0%; (95% C.I: 5.6-9.6), without significant differences between the two areas. Binomial model analysis showed that asthma symptoms were associated with mites (PR 1.78; 95% C.I. 1.0-3.0), Acremonium sp (PR 6.24; 95 C.I.: 3.8-10.0) and a history of child pneumonia (PR 4.0; 95% C.I. 2.5-6.4), allergic rhinitis (PR 1.9; 95% C.I.: 1.2-3.1), prematurity (PR 3.4; 95% C.I. 1.8-6.5), parents with asthma (PR 2.6; 95% C.I. 1.4-5.0) and pet ownership (PR 0.4; 95% C.I. 0.2-0.9). Conclusions. The indoor exposure to biological contaminants (dust mites and fungi), history of prematurity, pneumonia, rhinitis and family history of asthma increased the occurence of symptoms suggestive of asthma in young children. Introducción. La contaminación en el hogar puede desempe ar un papel importante en el desarrollo y exacerbación del asma infantil, sobre todo entre ni os genéticamente predispuestos. Objetivos. Evaluar la asociación entre la presencia de contaminantes biológicos intradomiciliarios y síntomas indicativos de asma, en preescolares de Bucaramanga, Colombia Materiales y métodos. Se hizo un estudio de corte transversal analítico, en menores de 7 a os, en dos zonas de la ciudad con niveles diferentes de contaminación atmosférica por material particulado. Se evaluaron los síntomas respiratorios indicativos de asma y los contaminantes intradomiciliarios mediante cuestionarios previamente validados, las mediciones biológicas de ácaros y hongos por métodos de laboratorio estandarizados, y se usó el modelo log binomial para el análisis multivariado, que permitió evaluar asociaciones mediante la estimación de las razones de prevalencia. Resultados. Par
Comparación de Técnicas de Lectura de Documentos de Requisitos de Software: Dise o de un Experimento.
María Inés Lund,Myriam Herrera,Laura Aballay,Sergio Zapata
Avances en Sistemas e Informática , 2007,
Abstract: For a software tool, the target of reaching customer /user satisfaction depends to a large extent on the quality of the software-requirement document. On this premise, the evaluation of software requirement documents specifically software inspection is a valuable tool for detecting defects and improve the software quality. The current work presents an experimental design proposal that compares two techniques for reading software requirement documents. The proposed experimental design is based on the Experimental Software Engineering principles, which only promote the acceptance of conclusions once a series of experimental tests has been done. The experiment was made in academic settings of the Universidad Nacional de San Juan, Argentina, with the participation of undergraduate and graduate students of Computer Science careers.
STRESS AND POLYAMINE METABOLISM IN FUNGI
Laura Valdés-Santiago,José Ruiz-Herrera
Frontiers in Chemistry , 2013, DOI: 10.3389/fchem.2013.00042
Abstract: Fungi, as well as the rest of living organisms must deal with environmental challenges such as stressful stimuli. Fungi are excellent models to study the general mechanisms of the response to stress, because of their simple, but conserved, signal-transduction and metabolic pathways that are often equivalent to those present in other eukaryotic systems. A factor that has been demonstrated to be involved in these responses is polyamine metabolism, essentially of the three most common polyamines: putrescine, spermidine and spermine. The gathered evidences on this subject suggest that polyamines are able to control cellular signal transduction, as well as to modulate protein-protein interactions. In the present review, we will address the recent advances on the study of fungal metabolism of polyamines, ranging from mutant characterization to potential mechanism of action during different kinds of stress in selected fungal models.
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