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Search Results: 1 - 10 of 466227 matches for " María Dolores Bargues "
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Genetic structure of Triatoma venosa (Hemiptera: Reduviidae): molecular and morphometric evidence
Vargas, Erika;Espitia, Claudia;Pati?o, Carlos;Pinto, Nestor;Aguilera, Germán;Jaramillo, Carlos;Bargues, María Dolores;Guhl, Felipe;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006000100008
Abstract: triatoma venosa presents a restricted geographical distribution in america and is considered as a secondary vector of chagas disease in colombia and ecuador. a total of 120 adult insects were collected in domestic and peridomestic habitats in an endemic area of the department of boyacá, colombia, in order to determine their genetic structure through morphometric and molecular techniques. the head and wings of each specimen were used for the analyses of size, shape, and sexual dimorphism. a significant sexual dimorphism was found, although no differences in size among the studied groups were detected. differences were found in the analyzed structures except for male heads. dna was extracted from the legs in order to carry out the internal transcriber space-2 (its-2) amplification and the randon amplified polymorphic dna (rapd) analyses. length polymorphisms were not detected in the its-2. fst and nm values were estimated (0.047 and 3.4, respectively). the high genetic flow found among the insects captured in the domicile and peridomiciliary environment does not permit a genetic differentiation, thus establishing the peridomicile as an important place for epidemiological surveillance.
Lymnaea schirazensis, an Overlooked Snail Distorting Fascioliasis Data: Genotype, Phenotype, Ecology, Worldwide Spread, Susceptibility, Applicability
María Dolores Bargues,Patricio Artigas,Messaoud Khoubbane,Rosmary Flores,Peter Gl?er,Raúl Rojas-García,Keyhan Ashrafi,Gerhard Falkner,Santiago Mas-Coma
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0024567
Abstract: Lymnaeid snails transmit medical and veterinary important trematodiases, mainly fascioliasis. Vector specificity of fasciolid parasites defines disease distribution and characteristics. Different lymnaeid species appear linked to different transmission and epidemiological patterns. Pronounced susceptibility differences to absolute resistance have been described among lymnaeid populations. When assessing disease characteristics in different endemic areas, unexpected results were obtained in studies on lymnaeid susceptibility to Fasciola. We undertook studies to understand this disease transmission heterogeneity.
Phylogeography and Genetic Variation of Triatoma dimidiata, the Main Chagas Disease Vector in Central America, and Its Position within the Genus Triatoma
María Dolores Bargues ,Debora R. Klisiowicz,Fernando Gonzalez-Candelas,Janine M. Ramsey,Carlota Monroy,Carlos Ponce,Paz María Salazar-Schettino,Francisco Panzera,Fernando Abad-Franch,Octavio E. Sousa,Christopher J. Schofield,Jean Pierre Dujardin,Felipe Guhl,Santiago Mas-Coma
PLOS Neglected Tropical Diseases , 2008, DOI: 10.1371/journal.pntd.0000233
Abstract: Background Among Chagas disease triatomine vectors, the largest genus, Triatoma, includes species of high public health interest. Triatoma dimidiata, the main vector throughout Central America and up to Ecuador, presents extensive phenotypic, genotypic, and behavioral diversity in sylvatic, peridomestic and domestic habitats, and non-domiciliated populations acting as reinfestation sources. DNA sequence analyses, phylogenetic reconstruction methods, and genetic variation approaches are combined to investigate the haplotype profiling, genetic polymorphism, phylogeography, and evolutionary trends of T. dimidiata and its closest relatives within Triatoma. This is the largest interpopulational analysis performed on a triatomine species so far. Methodology and Findings Triatomines from Mexico, Guatemala, Honduras, Nicaragua, Panama, Cuba, Colombia, Ecuador, and Brazil were used. Triatoma dimidiata populations follow different evolutionary divergences in which geographical isolation appears to have had an important influence. A southern Mexican–northern Guatemalan ancestral form gave rise to two main clades. One clade remained confined to the Yucatan peninsula and northern parts of Chiapas State, Guatemala, and Honduras, with extant descendants deserving specific status. Within the second clade, extant subspecies diversity was shaped by adaptive radiation derived from Guatemalan ancestral populations. Central American populations correspond to subspecies T. d. dimidiata. A southern spread into Panama and Colombia gave the T. d. capitata forms, and a northwestern spread rising from Guatemala into Mexico gave the T. d. maculipennis forms. Triatoma hegneri appears as a subspecific insular form. Conclusions The comparison with very numerous Triatoma species allows us to reach highly supported conclusions not only about T. dimidiata, but also on different, important Triatoma species groupings and their evolution. The very large intraspecific genetic variability found in T. dimidiata sensu lato has never been detected in a triatomine species before. The distinction between the five different taxa furnishes a new frame for future analyses of the different vector transmission capacities and epidemiological characteristics of Chagas disease. Results indicate that T. dimidiata will offer problems for control, although dwelling insecticide spraying might be successful against introduced populations in Ecuador.
Negociaciones para la modernización urbana: la demolición del mercado del Parián en la Ciudad de México, 1843
Lorenzo, María Dolores;
Estudios de historia moderna y contemporánea de México , 2009,
Abstract: indemnity as a device of urban modernization involves the negotiation of several social actors. this article studies the polemic created by the demolition of the parián market in mexico city in 1843. it shows how central government, the town hall and tradesmen (both mexican and spanish) represented various interests that marked the limits of an apparent consensus in favor of remodeling the great square.
Un puente en la zona transfronteriza: representaciones sociales, identidades y conflicto. El caso Posadas-Encarnación
Linares, María Dolores;
Estudios fronterizos , 2009,
Abstract: the economic and territorial transformations produced in the context of the integration process of mercosur have influenced in those zones where the societies of differents states are face to face: the national borders. the inauguration of a bridge, with the consequent custom and legal reforms, has changed the ways of living in the argentinean-paraguayan border. the bridge that unites the argentine city of posadas with its paraguayan neighbor of encarnación is, from 1992, the scene of transnational social manifestations involving part of the paraguayan and argentinean societies. the objective of the present article focus on the analysis of the social representations and identital vindications generated in the argentinean-paraguayan border by the study of the written press of both countries. we would like to make particular emphasis on the operational symbolic borders generated by each society, as well as on the notions of identity, not only in relation to the "other", but also to the central power, that is, the national state.
Rese a de "Dinámicas rurales en el subtrópico" de Luciano Martínez Valle
Vega , María Dolores
Iconos : Revista de Ciencias Sociales , 2004,
Los conflictos de la modernidad: la élite política en Puerto Rico, 1898-1904
Luque, María Dolores
Revista de Indias , 1997,
Abstract: This article analyzes the "98" and its meanings, namely the fact that the Porto Rican élite acepted it as a path opened for developement of a modernizing project under US leadership. A re-organization of the country was expected as a consequence of the Empire's democratic liberalism. This was however resisted by the local economical, social and cultural conditions. Although some achievements must be recognized, it is necessary to analyze whom they benefited and what they were meant for. Análisis de los significados del 98 a partir del estudio de la aceptación de la élite puertorrique a, que en esa coyuntura vio la oportunidad de realizar un proyecto modernizador bajo la égida de Estados Unidos. El liberalismo democrático del imperio posibilitaría la puesta en marcha de una reorganización del país que, sin embargo, chocó con las condiciones particulares y estructuras económicas, sociales y culturales de Puerto Rico. Aceptando la consecución de algunos logros, cabe preguntarnos para qué se hicieron y quiénes se beneficiaron de ellos.
Filipinas, fin de siglo: imágenes y realidad
Elizalde, María Dolores
Revista de Indias , 1998,
Abstract: The objective of this paper is to present an image of the Philippines at the end of the 19th century, different to the picture of underveloped islands, inhabitated by savages unable to selfgovernment, transmited by the historiography and caricatures of that time. With this purpose, they are studied the process of redefinition of the Spanish colonial goverment, the strengthening of a new filipino society, the development of the economy and commerce, and the strong international interests in the islands. El presente artículo pretende ofrecer una imagen de las Filipinas de fin de siglo, diferente de la transmitida por la historiografía tradicional y por la vi etas y caricaturas de la época. Frente a los estereotipos de unas islas atrasadas, incapaces del autogobierno, habitadas por salvajes a los que había que civilizar, se impone una realidad definida por el gobierno colonial de Espa a, en pleno proceso de redefinición; por el afianzamiento de una burguesía ilustrada filipina, la pujanza de una clase campesina y obrera, la fuerza de un movimiento de afirmación nacional, y el desarrollo de una economía agroexportadora en pleno crecimiento; y por la presencia de fuertes intereses internacionales que hay que entender insertos en la marea de expansión colonial y reparto de mercados y territorios ultramarinos; intereses internacionales de los que se da cuenta a través de un análisis de comercio, inversiones y presencia diplomática de las grandes potencias en las Filipinas de fin de siglo.
Los Neandertales en la Peninsula Ibérica
María Dolores Garralda
Munibe Antropologia-Arkeologia , 2005,
Abstract: Este trabajo es una síntesis de los datos existentes sobre los Neandertales encontrados en la Península Ibérica. La exposicón comienza con una breve intriducción explicando el origen del nombre con que se conoce este grupo humano, y continúa con algunas consideraciones sobre la dispersion cronológica de los Neandertales y los problemas de la identificación de sus orígenes. Los más importantes hallazgos de la península Ibérica son luego descritos, agrupándolos en cinco grandes regiones geográficas. Para cada yacimiento se detalla un resumen de los datos cronoestratigráficos y de las características antropológicas de los fósiles. Cabe recordar que muchos de ellos apareciron hace mucho tiempo, provocando que datos cruciales no hubieran sido recogidos por las circunstancias, pero también es verdad que problemas relacionados con el exacto contexto estratigráfico afectan también a algunos de los decubrimientos más recientes. La interpretación de la morfología de los restos humanos es complicada por esos difíciles problemas y además porque la mayor parte de ellos consisten en fragmentos aislados e incoimpletos. Laconclusión general es que el conjunto refleja la variabilidad inter- e intra-poblacional de los grupos Neandertales documentados en la Península Ibérica entre 170.000 y 30.000 B.P. La mayor parte de estos restos Neandertales fueron hallados con industrias Musterienses, pero algunos han aparecido con las llamadas "culturas de transición" entre el Paleolítico Medio y el Superior ; este parece ser el caso de los encontrados en la Cueva de El Castillo (nivel 18b) y en Lezetxiki (niveles III y IV), todos ellos localizados en la región norte de la Península Ibérica y muy cerca de varios de los pasos naturales hacia o desde otras regiones del Suoeste de Europa.
Gran Breta a ante Europa. Tormenta en el Canal. El continente aislado
Elizalde, María Dolores
Arbor : Ciencia, Pensamiento y Cultura , 2001,
Abstract: Not available El presente artículo estudia el difícil camino de Gran Breta a hacia la integración en la Comunidad Europea. El trabajo se inicia con un análisis de los factores que determinaron la posición británica ante Europa; explica luego el modelo de Europa deseado por los británicos; y se detiene especialmente en las distintas actitudes adoptadas por Gran Breta a durante el proceso de integración europea, centrándose en tres ámbitos: la política, la economía y la defensa. En ese marco, el trabajo revisa las razones por las que Gran Breta a apoyó o rechazó las distintas instituciones europeas que se fueron creando, los motivos de su alejamiento del núcleo inicial de la CEE, y las causas de su posterior incorporación a la estructura comunitaria.
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