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Search Results: 1 - 10 of 2950 matches for " Graciela Acevedo "
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La religiosidad popular expresada en lo político: el mito del reino feliz
Graciela Acevedo
Espacio Abierto , 2012,
Abstract: En este texto se analizan resultados parciales de una investigación donde buscamos, como objetivo general, acceder a las formas de participación religiosa de los inicios del tercer mileno y pretende dar contenido teórico a elementos constitutivos de la religiosidad que surgieron en la aproximación fenomenológica al objeto de estudio. La perspectiva teórica milenarista, que hace coincidir el deseo de justicia social y la necesidad de trascendencia con la existencia de un estado en crisis social, guía el estudio y nos explica como el Mito del Reino Feliz se ha actualizado en la forma del Mito Revolucionario. A partir de esa caracterización pudimos entender la intencionalidad de las acciones sociales -en donde parece sustituirse el miedo por la esperanza- que están fundamentadas en valores expresados en los testimonios (igualdad, solidaridad, sencillez, eternidad, justicia) perfectamente cónsonos con los que han constituido las diversas actualizaciones del Mito del Reino Feliz
Chemical study and anti-inflammatory activity of Capsicum chacoense and C. baccatum
López, Paula;Gorzalczany, Susana;Acevedo, Cristina;Alonso, Rosario;Ferraro, Graciela;
Revista Brasileira de Farmacognosia , 2012, DOI: 10.1590/S0102-695X2011005000187
Abstract: capsicum species, solanaceae, have been used for centuries as food additives by populations of different regions of the world. capsaicin (trans-methyl-n-vainillyl-nonenamide) is the main pungent compound extracted from the red hot pepper fruit (capsicum spp.). the capsaicin content was determined by means of a hplc method. the results showed that capsicum chacoense hunz., contains similar amounts of capsaicin (13.9 mg/100 g of dry fruit) in comparison with capsicum baccatum l. (12.6 mg/100 g) and capsicum annum l. (10.1 mg/100 g). dichloromethane (ch2cl2) and ethanol (etoh) extracts of c. chacoense elicited a 46% and 38 % of inhibition on the arachidonic acid (aa) pathway in ear edema respectively while the ch2cl2 and etoh extracts of c. baccatum inhibited 52% and 35% the arachidonic acid response respectively.
SIGNIFICATIVE ANO PROBLEM BASED LEARNING IN IMMUNOLOGY: OBTAINING A KIT TO TYPE NEISSERIA GONORRHOEAE
Marina Miguez,Susana Cáceres,Ana Acevedo2,,Graciela Bortagharay
Universitas Scientiarum , 2003,
Abstract: Neisseria gonorrhoeae (Ng) have been classified serologically on the basis of the antigenicity of the major porin (Por). Por! occurs in two immunochemically distinct serogroups: PorlA and Porffi. Because the diagnostic, therapeutic, social, and legal corisequences of misidentification of a nongonococcal Neisseria isolate as Ng can be substantial, the accurate and rapid identification of this organism is important. Typifying of Ng is done by techniques baséd on phenotypic characteristics and plasmidic content that individually don't reach an adequate discrimination, and so combination of techniques ·must be used. The aim of this work is to obtain polyclonal specificAb that discriminate Ng types Por!Aand Porffi. For this purpose, weimmunized two rabbits with sonicated PorlA and Porm strains ofNg (isolated from clínica! samples and serologically classified). The Ab response was analyzed along the protocol by ELISAand by direct agglutination with latex coated with sonicated Ng. With these data, we selected the bleeding providing the serum with maximum specific Ab ti ter to prepare the typing reagents. Unwanted Ab directed against shared epitopes were removed by adsorption with Ng latex. The typing reagents were obtained by coating latex with each depleted sera. Our results suggest that high titers of specific Ab be obtained for both strains ofNg and the depleted sera be discriminated between both strains. These results suggest that these diagnostic reagents could be useful to confirrn presumptive identification by a simple and rapid method.
The HLP mutation confers enhanced resistance to leafrust in different wheat genetic backgrounds  [PDF]
Cristina Andrea Kamlofski, Alberto Acevedo
Agricultural Sciences (AS) , 2010, DOI: 10.4236/as.2010.12008
Abstract: In several plant species, lesionmimic mutants simulate the diseaseresistance response in the absence of pathogens. Interestingly, some of these mutants confer broadspectrum resistance to diverse pathogens. We previously demonstrated that the HLP (hypersensitivelike phenotype) mutant of bread wheat (Triticum aestivum L.) exhibited spontaneous hypersensitive response (HR) in the absence of any pathogen input. However, when HLP plants showing HR phenotype were challenged with leafrust (Puccinia triticina) they were more resistant than plants of the motherline of comparable developmental stage that did not show spontaneous HR, suggesting that the HLP mutation may confer enhanced resistance to the fungus. In this paper we validate the aforementioned finding in several wheat genetic backgrounds. Two way crosses were performed among the HLP mutant and eight wheat commercial stocks, and third backcross progenies with and without spontaneous HR were challenged with leafrust to investigate the response to the fungus. Backcrosses to cv. Sinvalocho M.A., the mother line, and cv. Purplestraw, highly susceptible to leafrust attack, were used as controls. Third backcross progenies of cvs. Sinvalocho M.A., Purplestraw, Buck Guaraní and Pro INTA Imperial bearing spontaneous HR phenotype were more resistant to the fungal pathogen than third backcross progenies that did not carry the HLP mutation. Other four wheat stocks were as healthy as the HLP mutant. As expected, backcross to the motherline demonstrated that the HLP mutation conferred an additional resistance to the already healthy performance displayed by the motherline at adult plant stage. The introgression of the HLP mutation conferred heigh tened leafrust resistance and caused no kernel weight reduction on the backcrossed progenies. Taken together, these data validate the direct use of this type of mutations in diseaseresis tance breeding.
The use of reactors in biomining processes
Acevedo,Fernando;
Electronic Journal of Biotechnology , 2000,
Abstract: microbial processes applied to mining operations are gaining increasing interest in the last years. potential and current applications include the mining of gold, copper and other heavy metals, desulfurization of coal and oil, tertiary recovery of oil and biosorption of metal ions. currently, bacterial leaching of copper and biooxidation of refractory gold concentrates are well-established large-scale processes that are carried on using heaps and tank reactors. heap operation is simple and adequate to handle large volumes of minerals, but their productivity and yields are limited because of the severe difficulties in exerting an adequate process control. on the other hand, reactors can economically handle moderate volumes of material, but they allow for a close control of the variables involved, rendering significantly better performances. this paper reviews the basis of reactor selection and design for bioleaching processes. special attention is given to the influence of oxygen and carbon dioxide mass transfer, process stoichiometry, solids suspension and slurry homogeneity, and the use of bioreactors in gold mining. it is concluded that the future of reactors in biomining is promising and that new applications, such as the bioleaching of copper concentrates, will soon be a reality.
Present and future of bioleaching in developing countries
Acevedo,Fernando;
Electronic Journal of Biotechnology , 2002,
Abstract: nowadays bioleaching occupies an increasingly important place among the available mining technologies. today bioleaching is no longer a promising technology but an actual economical alternative for treating specific mineral ores. an important number of the current large-scale bioleaching operations are located in developing countries. this situation is determined by the fact that several developing countries have significant mineral reserves and by the characteristics of bioleaching that makes this technique especially suitable for these countries because of its simplicity and low capital cost requirement. the current situation of commercial-size bioleaching operations and ongoing projects in developing countries is presented and discussed with especial reference to copper and gold mining. it is concluded that this technology can significantly contribute to the economic and social development of these countries.
Acuerdos Comunes de Validez: Diálogo entre la Metodología Cuantitativa y Cualitativa
Acevedo,Carlos;
Cinta de moebio , 2011, DOI: 10.4067/S0717-554X2011000300004
Abstract: this article is divided into three sections. first, we define the state of physical science and logical positivism, concluding the transit of both towards constructivism. second, we outlined the piaget constructivism. third, with the intention of developing an example of this confluence in social sciences, we argue that few criteria of qualitative methodology validity are completely complementary to those contained in the statistics (paradigmatic technique used for quantitative analysis).
Resumen del libro: El transporte como soporte al desarrollo de Colombia. Una visión al 2040
Jorge Acevedo
Revista de Ingeniería , 2009,
Abstract: El propósito fundamental de este texto es que los lectores interesados tengan una visión global del libro "El transporte como soporte al desarrollo de Colombia. Una visión al 2040", trabajo interdisciplinario realizado por un grupo de profesores de la Universidad de los Andes y publicado por la misma Universidad. A continuación se resume en forma condensada algunos de los planteamientos y resultados de este libro, cuyo propósito fundamental no es predecir el futuro en tan largo plazo, sino plantear una visión prospectiva que estimule el debate sobre importantes decisiones de política pública que el país debe tomar en el corto plazo y que repercutirán decididamente en el largo plazo. Los méritos del trabajo pertenecen al grupo de autores, pero las omisiones e interpretaciones de este resumen son exclusiva responsabilidad de su autor.
Los costos económicos de la violencia en El Salvador
Carlos ACEVEDO
América Latina Hoy , 2009,
Abstract: RESUMEN: Este trabajo efectúa un ejercicio de cuantificación de los costos económicos asociados a las diversas manifestaciones y consecuencias de la situación de violencia prevaleciente en El Salvador, utilizando información para 2007. Tales costos son clasificados en cuatro grandes categorías: i) costos en salud; ii) costos institucionales (legales, judiciales y policiales); iii) costos preventivos en seguridad privada; y iv) pérdidas materiales. Los resultados de las estimaciones efectuadas indican que, en dicho a o, la violencia impuso sobre El Salvador un costo económico equivalente a 10,9% del Producto Interno Bruto (PIB) y a más del doble de las asignaciones presupuestarias para Educación y Salud. ABSTRACT: This essay carries out an accounting exercise on the economic costs derived from the violence situation which prevails in El Salvador, using information for 2007. Those costs are classified into four main categories: i) costs on health; ii) institutional costs (legal, judiciary and police); iii) preventive costs for private security; and iv) material losses. The results from the estimations performed indicate that, in 2007, the different expressions and consequences derived from the violence situation imponed on El Salvador an economic cost which was equivalent to 10,9% of Gross Domestic Product (GDP) and more than twice the combined budget allocations to Education and Health.
The Foundations of Probability with Black Swans
Graciela Chichilnisky
Journal of Probability and Statistics , 2010, DOI: 10.1155/2010/838240
Abstract: We extend the foundation of probability in samples with rare events that are potentially catastrophic, called black swans, such as natural hazards, market crashes, catastrophic climate change, and species extinction. Such events are generally treated as ‘‘outliers’’ and disregarded. We propose a new axiomatization of probability requiring equal treatment in the measurement of rare and frequent events—the Swan Axiom—and characterize the subjective probabilities that the axioms imply: these are neither finitely additive nor countably additive but a combination of both. They exclude countably additive probabilities as in De Groot (1970) and Arrow (1971) and are a strict subset of Savage (1954) probabilities that are finitely additive measures. Our subjective probabilities are standard distributions when the sample has no black swans. The finitely additive part assigns however more weight to rare events than do standard distributions and in that sense explains the persistent observation of ‘‘power laws’’ and ‘‘heavy tails’’ that eludes classic theory. The axioms extend earlier work by Chichilnisky (1996, 2000, 2002, 2009) to encompass the foundation of subjective probability and axiomatic treatments of subjective probability by Villegas (1964), De Groot (1963), Dubins and Savage (1965), Dubins (1975) Purves and Sudderth (1976) and of choice under uncertainty by Arrow (1971). 1. Introduction Black swans are rare events with important consequences, such as market crashes, natural hazards, global warming, and major episodes of extinction. This article is about the foundations of probability when catastrophic events are at stake. It provides a new axiomatic foundation for probability requiring sensitivity both to rare and frequent events. The study culminates in Theorem 6.1, that proves existence and representation of a probability satisfying three axioms. The last of these axioms requires sensitivity to rare events, a property that is desirable but not respected by standard probabilities. The article shows the connection between those axioms and the Axiom of Choice at the foundation of Mathematics. It defines a new type of probabilities that coincide with standard distributions when the sample is populated only by relatively frequent events. Generally, however, they are a mixture of countable and finitely additive measures, assigning more weight to black swans than do normal distributions, and predicting more realistically the incidence of “outliers,” “power laws,” and “heavy tails” [1, 2]. The article refines and extends the formulation of probability in an
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