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Search Results: 1 - 10 of 34749 matches for " Elsa Fernández "
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Lymphomatoid Granulomatosis as a Debut of Common Variable Immunodeficiency: A Case Report and Review of Literature  [PDF]
Magdalena Fernández-García, Tetyana Zhuravetska, Jose Luis Rodríguez, Elsa Ots
Journal of Biosciences and Medicines (JBM) , 2014, DOI: 10.4236/jbm.2014.28002
Abstract: Lymphomatoid granulomatosis, currently called as extranodal angiocentric and angiodestructive immunoproliferative disorder, is a rare entity of unclear etiology. It involves most frequently lungs, central nervous system and skin. The clinical course is variable, but mortality is high. Today, it represents a diagnostic challenge because it can emulate autoimmunity, infection, and malignancy processes. Optimal therapy scheme is still unknown. We report the case of a 20 year-old man presenting with fever, weight loss, sweating, multiple bilateral lung nodules on the chest X-ray and cutaneous involvement.
A note on the spectral properties of cluster algebras
Elsa Fernández,María Inés Platzeck
Mathematics , 2010,
Abstract: Let $Q$ be a finite quiver without oriented cycles and $k$ an algebraically closed field.In this paper we establish a connection between cluster algebras and the representation theory of the path algebra $kQ$, in terms of the spectral properties of the quivers mutation equivalent to $Q$.
On m-cluster tilted algebras and trivial extensions
Elsa Fernández,Isabel Pratti,Sonia Trepode
Mathematics , 2012,
Abstract: In this work we study the connection between iterated tilted algebras and m-cluster tilted algebras. We show that an iterated tilted algebra induces an m-cluster tilted algebra. This m-cluster tilted algebra can be seen as a trivial extension of another iterated tilted algebra which is derived equivalent to the original one. We give a procedure to find this new iterated tilted algebra. These m-cluster tilted algebras are quotients of higher relation extensions.
Estructura de mosaico del cromosoma bacteriano: Islas patogénicas
Fernández F,Sandra; Alonso,Guillermina; Toro A,Elsa S;
Revista del Instituto Nacional de Higiene Rafael Rangel , 2004,
Abstract: the pathogenic islands (pais) are bacterial dna segments that carry one or more genes of virulence, which have been acquired in block from an outsourcing. the genome of a pathogen usually represents a mosaic between these new acquired islands and a relatively old dna. the pais are identified by their difference in the percentage of g+c content related to the average of the chromosome and by other characteristics, which suggest their acquisition through movable genetic elements. genes for an wide range of virulence determinants are associate with pais, including which codify for certain mechanisms to resist the defenses, factors of colonization, acquisition of nutrients and toxins. the study and knowledge of the pais provide important evidences to the biology of the pathogenic bacteria. in a future, the products of the pais will be able to represent targets for the antimicrobial therapy, vaccines and diagnostic tools.
Estructura de mosaico del cromosoma bacteriano: Islas patogénicas
Sandra Fernández F,Guillermina Alonso,Elsa S Toro A
Revista del Instituto Nacional de Higiene Rafael Rangel , 2004,
Abstract: Las islas patogénicas (PAIs) son segmentos de ADN bacteriano que portan uno o más genes de virulencia, los cuales han sido adquiridos en bloque de una fuente externa. El genoma de un patógeno usualmente representa un mosaico entre estas islas recién adquiridas y un ADN relativamente antiguo. Las PAIs son identificadas por su diferencia en el porcentaje de contenido de G+C en relación a la media del cromosoma y por otras características, que sugieren su adquisición a través de elementos genéticos móviles. Genes para una amplia gama de determinantes de virulencia están asociados con PAIs, incluyendo los que codifican para ciertos mecanismos que le permiten resistir las defensas del hospedador, factores de colonización, adquisición de nutrientes y toxinas. El estudio y conocimiento de las PAIs provee evidencias importantes de la biología de las bacterias patógenas. Los productos de las PAIs podrán representar, en un futuro, blancos para la terapia antimicrobiana, vacunas y herramientas diagnósticas. The pathogenic islands (PAIs) are bacterial DNA segments that carry one or more genes of virulence, which have been acquired in block from an outsourcing. The genome of a pathogen usually represents a mosaic between these new acquired islands and a relatively old DNA. The PAIs are identified by their difference in the percentage of G+C content related to the average of the chromosome and by other characteristics, which suggest their acquisition through movable genetic elements. Genes for an wide range of virulence determinants are associate with PAIs, including which codify for certain mechanisms to resist the defenses, factors of colonization, acquisition of nutrients and toxins. The study and knowledge of the PAIs provide important evidences to the biology of the pathogenic bacteria. In a future, the products of the PAIs will be able to represent targets for the antimicrobial therapy, vaccines and diagnostic tools.
Actividad repelente de aceites esenciales contra las picaduras de Lutzomyia migonei (Diptera: Psychodidae)
Nieves,Elsa; Fernándezndez,Janett; Lias,José; Rondón,Maritza; Brice?o,Benito;
Revista de Biología Tropical , 2010,
Abstract: repellent activity of plant essential oils against bites of lutzomyia migonei (diptera: psychodidae). natural repellents from plant extracts have demonstrated good efficacy against bites of some insect species. the present study evaluated the repellent effect of essential oils extracted from 8 plants species against bites of lutzomyia migonei, the leishmania vector. the essential oils were extracted by steam destillation in clevenger chamber, from the following plants: hyptis suaveolens, pimenta racemosa, piper marginatum, monticalia imbricatifolia, pseudognaphalium caeruleocanum, espeletia shultzii, plecthranthus amboinicus and cinnamomun zeylanicum. repellency tests were performed under laboratory conditions by the human hand method in cage assays, using female colonies of l. migonei. the more effective oils were tested at variable concentrations on different volunteers. the protection percentage and time were calculated. the results showed what oils of p. caeruleocanum and c. zeylanicum were the most effective. although p. amboinicus oil also had repellent effect showed an irritant effect. the oils p. marginatum, h. suaveolens and p. racemosa showed no repellent effect, while the rest of oil extracts showed significant repellency in variable degrees. p. caeruleocanum and c. zeylanicum oils provided the 95% protection against bites of l. migonei for 3h. the p. caeruleocanum oil showed the greatest protection time, with a mean over 4h and 3h at concentrations of 50% and 10% respectively. the results suggest that the p. caeruleocanum oil could represent a potential natural repellent against leishmania vectors. rev. biol. trop. 58 (4): 1549-1560. epub 2010 december 01.
Actividad repelente de aceites esenciales contra las picaduras de Lutzomyia migonei (Diptera: Psychodidae)
Elsa Nieves,Janett Fernándezndez,José Lias,Maritza Rondón
Revista de Biología Tropical , 2010,
Abstract: Los repelentes naturales de extractos de plantas han mostrado eficacia contra diferentes especies de insectos. El presente estudio evaluó la acción repelente de aceites esenciales extraídos de ocho especies de plantas contra las picaduras de Lutzomyia migonei, vector de Leishmania. Los aceites esenciales se obtuvieron por hidrodestilación, utilizando una trampa de Clevenger, a partir de Hyptis suaveolens, Pimenta racemosa, Piper marginatum, Monticalia imbricatifolia, Pseudognaphalium caeruleocanum, Espeletia shultzii, Plectranthus amboinicus y Cinnamomun zeylanicum. Los ensayos de repelencia se realizaron sobre humanos en condiciones de laboratorio, frente a hembras de L. migonei provenientes de colonia, utilizando el método de la mano en la jaula. Los aceites con efecto repelente también se ensayaron con distintos voluntarios y concentraciones. Se determinó el porcentaje de protección y el tiempo de protección. Los resultados revelaron que el aceite de P. caeruleocanum y C. zeylanicum fueron los más efectivos. El aceite de P. amboinicus presentó efecto de repelencia satisfactorio, sin embargo, ocasionó picazón y toxicidad en la piel. Los aceites de P. marginatum, H. suaveolens y P. racemosa no evidenciaron efecto repelente; el resto de los aceites presentaron repelencia significativa en grado variable. Los aceites de P. caeruleocanum y C. zeylanicum mostraron un 95% de protección de 3h contra las picaduras de L. migonei. El aceite de P. caeruleocanum presentó el mayor tiempo de protección, de más de 4h y de 2h en concentraciones de 50% y 10%, respectivamente. Los resultados sugieren que el aceite P. caeruleocanum podría ser un potencial candidato como repelente natural contra la picadura de dípteros posibles transmisores de Leishmania. Repellent activity of plant essential oils against bites of Lutzomyia migonei (Diptera: Psychodidae). Natural repellents from plant extracts have demonstrated good efficacy against bites of some insect species. The present study evaluated the repellent effect of essential oils extracted from 8 plants species against bites of Lutzomyia migonei, the Leishmania vector. The essential oils were extracted by steam destillation in Clevenger chamber, from the following plants: Hyptis suaveolens, Pimenta racemosa, Piper marginatum, Monticalia imbricatifolia, Pseudognaphalium caeruleocanum, Espeletia shultzii, Plecthranthus amboinicus and Cinnamomun zeylanicum. Repellency tests were performed under laboratory conditions by the human hand method in cage assays, using female colonies of L. migonei. The more effective oils were teste
Análisis de la oferta de programas de pregrado en medicina en Colombia, durante los últimos 30 a os (1980-2010) Analysis of the supply of medicine undergraduate programs in Colombia, during the past 30 years
Daniel G Fernández ávila,Liliana Carolina Mancipe García,Diana C. Fernández ávila,Elsa Reyes Sanmiguel
Revista Colombiana de Reumatología , 2011,
Abstract: La educación superior en Colombia ha sufrido una importante transformación desde diciembre de 1992, cuando entra en vigencia la ley 30. Los programas de educación en ciencias de la salud y en especial los de pregrado en medicina no fueron ajenos a estos cambios y se presentó una proliferación de facultades y escuelas de medicina a lo largo y ancho del país. Las críticas desde diversos sectores no se han hecho esperar y los entes gubernamentales han buscado diversos mecanismos para garantizar la calidad de los procesos de formación y por ende de los futuros médicos. En el presente estudio se analiza la evolución de la oferta de programas de pregrado en Colombia durante los últimos 30 a os. Higher education in Colombia has undergone a major transformation since December of 1992 when the 30 law takes effect. Education programs in health sciences and especially medicine programs were not oblivious to these changes and there was a proliferation of medical schools throughout the country. Were many criticisms from various sectors and government agencies have sought various mechanisms to ensure the quality of training processes and hence of future physicians. In this study we examined the evolution of the offer undergraduate programs in Colombia over the past 30 years.
PERFORMANCE OF CACTUS LEFARIA TO USE LIKE COAGULATING IN THE WATER CLARIFICATION
Martínez,Daimarys; Chávez,Magaly; Díaz,Altamira; Chacín,Elsa; Fernández,Nola;
Revista Técnica de la Facultad de Ingeniería Universidad del Zulia , 2003,
Abstract: abstract in this investigation, the performance of cactus lefaria as coagulating agent was evaluated for water clarification process. the experiment were run at lab scale, by preparing synthetic turbid waters with initial turbidity values from 20 to 150 ntu to compare with the waters which enter to the local treatment plant. the coagulation tests were performed to the raw cactus and cactus treated with methanol, ethyl acetate and petroleum ether. the parameters measured were turbidity, color and optima doses of coagulating agent determination. the results showed that the cactus lefaria removed the turbidity between a 80-90%. the best turbidity values were obtained when cactus lefaria was treated with methanol and ethyl acetate for a initial water turbidity from 20 to 30 ntu. this show that methanol and ethyl acetate no extracted the active substance from cactus lefaria. the optima dosis of coagulating was 10 mg/l of cactus. showing that cactus lefaria can be used like primary coagulating, being this very efficient to waters with initial turbidity of 30 ntu.
ATECOM, registro computarizado de pacientes incluidos en investigaciones de aterosclerosis en la comunidad
Regalado Miranda,Elsa; Fernández-Britto Rodríguez,José Emilio;
Revista Cubana de Investigaciones Biom??dicas , 2010,
Abstract: to make research on atherosclerosis easier a data base, on patients of the community suffering from this disease, was implemented. this data base will allow collecting, saving and recovering information for its further processing and centralization. the developed product was under a main control panel and several forms which simplify its management. its elaboration was done in three stages: the first stage was a group work to select the variables and to create a relation entity model, a second stage to design and assemble the product and a last one to validate the product. the product was based on the primary data collection model of the havana atherosclerosis research and reference center (cirah). it allows the input and output of information and it includes possibilities to withdraw the data according to the type of study and it is also available to other systems for its statistics processing. it was validated through the training program provided to those in the atherosclerosis research certified studies.
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