998 resultados para Mexico Historia Revolução 1910-1920


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This paper explores the real exchange rate behavior in Mexico from 1960 until 2005. Since the empirical analysis reveals that the real exchange rate is not mean reverting, we propose that economic fundamental variables affect its evolution in the long-run. Therefore, based on equilibrium exchange rate paradigms, we propose a simple model of real exchange rate determination which includes the relative labor productivity, the real interest rates and the net foreign assets over a long period of time. Our analysis also considers the dynamic adjustment in response to shocks through impulse response functions derived from the multivariate VAR model.

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This technical background paper describes the methods applied and data sources used in the compilation of the 1980-2003 data set for material flow accounts of the Mexican economy and presents the data set. It is organised in four parts: the first part gives an overview of the Material Flow Accounting (MFA) methodology. The second part presents the main material flows of the Mexican economy including biomass, fossil fuels, metal ores, industrial minerals and, construction minerals. The aim of this part is to explain the procedures and methods followed, the data sources used as well as providing a brief evaluation of the quality and reliability of the information used and the accounts established. Finally, some conclusions will be provided.

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En las dos últimas décadas del siglo XIX en España el cooperativismo de crédito orientado hacia los pequeños productores agrícolas estuvo bastante ligado a las corrientes del “Regeneracionismo conservador” y el catolicismo social. Hemos estudiado las aportaciones de dos autores: Joaquín Díaz de Rábago y Nicolás Fontes. Díaz de Rábago contó con una fuerte formación teórica y colaboró en la redacción de un proyecto de ley sobre cooperativas, pero a pesar de su influencia no consiguió potenciar ninguna actividad concreta. Nicolás Fontes representa al hombre “práctico”. Sus circunstancias personales, era un importante terrateniente, lo animaron a poner en práctica un sistema de crédito destinado a ayudar a los pequeños arrendatarios. El modelo que puso en práctica se inspiraba en el Raiffeisen System, el mismo que defendía por Rábago. El desconocimiento mutuo de sus actuaciones invita a reflexionar sobre las limitaciones en la difusión del cooperativismo agrícola de crédito en España.

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In this paper we compare the resource flows of Chile, Ecuador, Mexico and Peru between 1980 and 2000. In this time span, the domestic extraction of materials increased in the four countries, mainly due to the mining sector in Chile and Peru, biomass and oil in Ecuador and construction minerals in Mexico. Imports and exports increased too, due to the increasing integration in the international markets, prompted by the liberalization policies undertaken by the four countries between the late 1970s and the late 1990s. The four countries had a negative physical trade balance for most of the period analyzed, meaning that their exports exceeded their imports in terms of weight. However, the increase of imports reduced the physical deficit in Chile, Mexico and Peru. Ecuador’s physical deficit was the highest and did not decrease in the period analyzed. Also, a diversification of exports away from bulk commodities could be observed in Chile and Mexico, and to a lesser extent in Peru, whereas in Ecuador the export sector remained mainly based on oil and biomass. More research is needed to explore the environmental effects of this phenomenon. Also, the indirect flows associated to the direct physical flows deserve to be subject to further analysis.

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Clase impartida por el historiador Alfred Bosch sobre la evolución de la candidatura de Barcelona'92 y del Comité Organizador de los Juegos en el curso universitario sobre Olimpismo organizado por el CEO-UAB en febrero de 1992.

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Contribuindo para o conhecimento de alguns cestódeos do gênero Raillietina Fuhrmann, 1920, parasitos de Columbiformes, são estudadas aqui duas espécies encontradas em intestino delgado de columba livia dom. L. 1758. Uma delas, Raillietina (Raillietina) allomyodes (Kotlan, 1921), originalmente descrita da Nova Guiné, é agora assinalada pela primeira vez no Brasil, em novo hospedeiro. A outra, Raillietina (Fuhrmannetta) crassula (Rudolphi, 1819) apesar de ter sido descrita de material do Brasil e África, não tem uma descrição detalhada.

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The systematic positon of Trypanosoma rangeli is reconsidered and the creation of a new subgenus. Tejeraia, is proposed to remove this trypanosome from the subgenus Herptosoma of the section Stercoraria. The characteristics described for the proposed subgenus indicate that it must be located in the section Salivaria rather than in the Stercoraria. The evidence supporting this proposition is discussed in the text.

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En la presente investigación estudiamos cuales han sido los temas y debates que se han generado en España alrededor del problema de la distribución del agua. Empezaremos nuestro relato con la aparición del primer proyecto hidrológico a finales del siglo XIX hasta la era de Franco, una época que podemos caracterizar como la de los grandes planes hidrológicos pensados para fomentar la expansión del regadío. Queremos ver cómo ha cambiado la dinámica del abordaje de estos temas, cuáles han sido los debates que han generado y cuáles los actores implicados en los mismos, prestando especial atención al papel de los expertos.

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The morphological sequence of Trypanosoma rangeli development in the alimentary canal of Rhodnius prolixus, is described, with observation made in dissected guts from 6 hours to 45 days post-infection. No metacyclic-forms are produced in the digestive tract at any time, and transmission by the contaminative route must be considered atypical. Amastigotes appear to be an essential stage in the development of T. rangeli in the gut of R. prolixus. The epidemiological importance of the developmental pattern of T. rangeli in the vector´s gut is discussed, and its usefulness for aging infection is considered.

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The morphological sequence of Trypanosoma rangeli development in the body cavity of Rhodnius prolixus is described. The metacyclic trypanosome is the product of successive division and transformation during the intra and extracellular development in the haemocoele. The significance of the early invasion of T. rangeli into the haemolymph is discussed. The epidemiological importance of the developmental pattern of T. rangeli in the vectors haemolymph and the host-response to the parasite are considered.

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The pathological effects of Trypanosoma rangeli on Rhodnius prolixus and R. robustus, and the relation of mortality to infection, were studied under laboratory conditions. Frequent observations revealed that when the first instar nymphs of R. prolixus and R. robustus were infected with T. rangeli, survival of the bugs during the stages of development to the adult stage decreased. This decrease was statistically significant when compared with uninfected control-bugs, indicating that T. rangeli is pathogenic for both species of triatomine. In R. prolixus the most affected nymphal stages were the first, second and fifth instars, where a higher mortality was also observed. In R. robustus a progressive increase of the mortality from the first to fifth instars, was observed. The pathogenicity of T. rangeli as measured by overall mortality was the same in R. prolixus and R. robustus. The possible pathogenic mechanism of T. rangeli in triatomine-bugs and its epidemiological implications, are discussed.

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El "Lecciones de Historia Natural", publicat a Barcelona l'any 1820, és considerat el primer llibre de text sobre història natural original i publicat en llengua castellana. El seu autor, Agustí Yàñez, fou un personatge molt conegut de la societat barcelonina de la primera meitat del segle XIX i una peça principal en el desenvolupament de l'ensenyament universitari de la farmàcia i en la difusió de la ciència a la societat. L'estudi del seu llibre de text i el d'altres fonts permeten copsar com s'ensenyava la història natural al Col·legi de farmàcia de Barcelona en aquell període.

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Bajo condiciones experimentales se estudia el curso de la infección primaria y la respuesta a las reinfecciones por Trypanosoma rangeli en ratones albinos y Didelphis marsupialis. Durante el curso de la infección primaria en ratones, se observa una parasitemia relativamente baja y de corta duración. Los mismos muestran durante la primera reinfección una parasitemia escasa de cuatro días de duración, siendo resistentes a las sucesivas reinfecciones con T. rangeli. Los ejemplares de D. marsupialis exhiben una parasitemia de más larga duración, pero con un nivel de parásitos sanguícolas mucho menor que el detectado en el modelo ratón, siendo la respuesta a las reinfecciones similar a la observada en ratones. Se detectan anticuerpos hemaglutinantes en los sueros inmunes de ratones y Didelphis marsupialis, sometidos a la reinfección por T. rangeli. Se especula sobre la posible acción sinérgica de una respuesta inmune en el sitio de deposición en contra de las formas metacíclicas de T. rangeli y la acción de anticuerpos circulantes en contra de las formas sanguícolas, para explicar la resistencia de ambos modelos a las reinfecciones por T. rangeli.