1,703 research outputs found
2. Stephanion. Homenaje a Maria C. Giner., édité par C. Cordoner, M. P. Fernanda Alvarez, J.A. Fernadez Delgado
No full textDobias-Lalou Catherine. 2. Stephanion. Homenaje a Maria C. Giner., édité par C. Cordoner, M. P. Fernanda Alvarez, J.A. Fernadez Delgado. In: Revue des Études Grecques, tome 104, fascicule 497-499, Juillet-décembre 1991. p. 595
2. Stephanion. Homenaje a Maria C. Giner., édité par C. Cordoner, M. P. Fernanda Alvarez, J.A. Fernadez Delgado
No full textDobias-Lalou Catherine. 2. Stephanion. Homenaje a Maria C. Giner., édité par C. Cordoner, M. P. Fernanda Alvarez, J.A. Fernadez Delgado. In: Revue des Études Grecques, tome 104, fascicule 497-499, Juillet-décembre 1991. p. 595
Changes in the porosity induced by tillage in typical Argiudolls of southeastern Buenos Aires Province, Argentina, and its relationship with the living space of the mesofauna: a preliminary study
No full textThe study of structure is essential to understand the effects of natural and anthropogenic degradation of the environment. Continuous tillage has negative effects on soil structure. The structural heterogeneity of the soil is a key element which makes it possible for several functional groups of organisms to coexist in the soil. Thus, the soil provides a habitat for a vast array of small and large organisms residing permanently or temporarily within it. The aim of our work is to analyze the effect of tillage in typical Argiudolls of Los Padres Pound, in the pores morphology, size and roughness, and its relationship with the potential available habitat space of the mesofauna. We worked on a cultivated plot, for over 40 years, and referencing a plot with non-farmed soils. Size, number, and roughness of pore were determined. For mesofauna, they were taken into account previous studies in these soils. The results of this study proved such influence of tillage on soil structure in the cultivated plot. The modifications of physical properties resulting from tillage are due to the decrease in total porosity and the modification in the type, size, and roughness of the pores. The decrease in total porosity might influence the abundance and diversity of mesofauna in these typical Argiudolls.Fil: Alvarez, Maria Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Osterrieth, Margarita Luisa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Cooper, Miguel. Universidade de Sao Paulo; Brasi
Replacing trees by bamboos: Changes from canopy to soil organic carbon storage
No full textDisturbances such as selective logging in a forest may lead to a degradation process, where new species become dominant and replace the original vegetation. This is the case of the Semi-deciduous Atlantic Forest, where bamboos replace trees and palms, affecting the forest structure and dynamics. As bamboos show plant traits that contrast those of trees and palms, we hypothesize that forest degradation affects ecosystem properties, generating changes in litterfall and litter decay rates, which transfer from plants to soil. We tested this hypothesis in twelve 0.36 ha plots along a forest degradation gradient in the subtropical forest of Northeastern Argentina. Total litterfall did not change along forest degradation, but litter layer necromass decreased more than 60% and litter thickness doubled in highly degraded sites. Litter layer thickness was associated with bamboo necromass present in the litterfall. Forest degradation also caused a deceleration in decomposition of the two most contrasting litter types under study, while the soil organic carbon content in the top 5 cm suffered a 50% decrease, from 21.5 to 10.9 Mg ha−1. Forest degradation has a cascade effect on carbon storage and on its cycling from vegetation to soil by means of changes in different ecosystem processes mediated by plants. In the end, these changes affect soil organic carbon. This study provides a better understanding on the mechanisms behind carbon losses in relation to forest degradation, one of the greatest uncertainties in the carbon budget.Fil: Zaninovich, Silvia Clarisa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Universidad Nacional de Misiones. Instituto de Biología Subtropical; ArgentinaFil: Montti, Lia Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Alvarez, Maria Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Gatti, Maria Genoveva. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Universidad Nacional de Misiones. Instituto de Biología Subtropical; Argentin
Charcoal and biological activity in formiguer soils of Catalonia (Spain): Application of a micromorphological approach
No full textThe “formiguers” (earth mounds to burn woody plant residues) constituted a common practice of fertilization of soils in many regions of Spain in the past. The result of combustion is the formation of char, charcoal, soot, graphitic carbon and black carbon, which increased soil fertility. We applied a micromorphological approach to study the relationship between charcoal and features due to biological activity on some soils of Catalonia where “formiguers” were traditionally applied. Five sites with different land uses were selected in the north and south of Catalonia, and soil thin sections were obtained from undisturbed samples. The micromorphological characterization and the quantification of the total porosity, biopores, charcoal and biospheroids due to earthworms were determined. Samples from horticultural fields showed higher total porosity (15%) than those from other fields (9%). A similar pattern appeared in relation to charcoal abundance, 1.3% in horticultural plots compared to near null presence in other plots. The biopore percentage was approximately twice (11.2%) in the north sites with respect to the south sites, and biospheroids were absent in the latter while their mean abundance was 1% in the former. Our results suggest that the presence of charcoal fragments have significantly influenced bioporosity in the studied soils. The micromorphological techniques proved useful to study of the distribution and abundance of charcoal and biospheroids in formiguer soils in Catalonia.Fil: Alvarez, Maria Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; ArgentinaFil: Poch Claret, Rosa Maria. Universidad de Lleida; EspañaFil: Olarieta, José Ramón. Universidad de Lleida; EspañaFil: Wiedner, Katja. Gütegemeinschaft Kompost Ost e. V. Colonia; Alemani
Sequence remake of... Psycho [Psicosis]
No full textRemake de una escena de la película de Alfred Hitchcock "Psicosis". Ejercicio: seleccionar una escena de una película. Basar una presentación grupal analizando sus características audiovisuales y narrativas.Directed by: Ignacio Álvarez; assistant director: Emiliano Morales; camera: Maria Eugenia Sus, Fernanda Friss de Kereki; set decorator: Darío Stanisich; unit manager: Martín Varela, Santiago Villarmarzo, Macarena Fernández; edited by: Ignacio Álvarez; costume supervisor: Magdalena Haretche; hairstylist: Carlos Uliano; special effects: Ignacio Alvarez
Discursos sobre a influência da sociedade civil transnacional na Rio-92
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas, Programa de Pós-Graduação em Sociologia Política, Florianópolis, 2013.Esta dissertação compreende o estudo de discursos de ativistas a respeito da influência da sociedade civil transnacional (SCT) sobre a Rio-92, também conhecida por Eco 92. Múltiplas fontes embasaram este estudo: entrevistas com ativistas que foram protagonistas durante os eventos preparatórios e de culminância; documentos históricos como a Agenda 21, a Declaração do Rio de Janeiro e os Tratados Alternativos da Sociedade Civil; a bibliografia consolidada no tema; conceitos e noções referentes ao atravessamento dos limites estatais exercido pela sociedade civil, em sua configuração e formas de atuação; e abordagens pós-coloniais para a contextualização do sistema atual e de possibilidades de transformação imaginadas no Sul. A análise de discursos dos ativistas demonstra que o evento representou um momento de emergência de um pensamento de fronteira, de fissura no imaginário dominante, que permitiu que a Rio-92 fosse uma ocasião maior que a Conferência das Nações Unidas sobre Meio Ambiente e Desenvolvimento (CNUMAD), e congregasse ocasiões como o Fórum Global, evento paralelo composto predominantemente por ONGs e movimentos sociais. As disputas da SCT por hegemonia no direcionamento de discursos e na organização do evento paralelo compartilharam espaço com propósitos de reconhecimento da transversalidade de lutas sociais e ambientais (majoritariamente orientados por um pensamento do Sul), e na conformação de novas redes de relações entre atores de cunho não-governamental, governamental e intergovernamental. Foi possível perceber que as conferências da ONU da década de 1990 se configuraram como estruturas de oportunidade política de internacionalização das ações coletivas, insurgentes na Rio-92 em muito devido às novas alianças estabelecidas. Mais além, a SCT constituiu distintos modos de atribuição de sentido para o desenvolvimento sustentável, o principal tema de discussão do evento, de acordo com a orientação dos projetos políticos dos grupos - fossem projetos tendentes à construção de contra hegemonias ou à colaboração com o sistema dominante.<br
Sustainable urban public transport systems in bucaramanga: an approach to the carbon footprint of the metrolinea transportation system, years 2015-2017*
No full textLa temperatura media del planeta está en un constante aumento debido al incremento de las emisiones de GEI generadas por la acción humana. Estos gases permiten que entre energía solar pero no que salga el calor, lo que ha traído consigo enormes repercusiones en el ambiente y en el bienestar de las personas. En esta investigación se calculó la huella de carbono del Sistema Integrado de Transporte Metrolínea a partir del año 2015 hasta el año 2017 determinando la cantidad de emisiones de CO2 equivalente expresado en toneladas mediante el protocolo de gases de efecto invernadero, utilizando datos encontrados en informes de gestión de Metrolínea. Por su parte, debido a la normativa ambiental adoptada (Euro III y Euro IV) en la implementación del Sistema en la ciudad, Metrolínea no está a la par de la tecnología de países Europeos Euro V y Euro VI. Sin embargo, el sistema de transporte Metrolínea en Bucaramanga comparado con el parámetro de media de emisiones para el sector transporte de 2,69 kg cO2 eq/lt propuesta por el Grupo Intergubernamental de Expertos por el Cambio Climático, se encuentra por debajo siendo 2,687 Kg CO2eq/lt. Por esto, se deben crear estrategias para remplazar la tecnología obsoleta de flota de vehículos del sistema, así como políticas de reducción de emisiones para que no supere esta media. *PregradoEconomistaThe average temperature of the planet is constantly increasing due to the increase in GHG emissions generated by human action. These gases allow solar energy to enter but not the heat to escape, which has brought enormous repercussions on the environment and the well-being of people. In this research, the carbon footprint of the Integrated Metrine Transport System was calculated from 2015 until 2017 determining the amount of CO2 equivalent emissions expressed in tons through the greenhouse gas protocol, using data in the management of Metrolínea. Due to the environmental regulations adopted (Euro III and Euro IV) in the implementation of the System in the city, Metrolínea is not on par with the technology of the European countries Euro V and Euro VI. However, the Metrolínea transport system in Bucaramanga compared to the means of emissions for the transport sector of 2,69 kg of CO2 eq / lt proposed by the Intergovernmental Panel for Climate Change is below 2,687. Kg CO2eq / lt. Therefore, strategies must be created to improve the obsolete technology of the vehicle fleet of the system, as well as policies to reduce emissions to not exceed the average emissions. * Draft Degree ** Faculty of Human Sciences. School of Economics and Administration. Director: Juan Carlos Rivera Alvarez. Codirector: Isaac Guerrero Rincón
Eutrophication in a semi-desert coastal ecosystem promotes increases in N and C isotopic signatures and changes in primary sources
No full textUsing C and N isotopic signatures of food web components, we evaluated the land-marine coupling through nutrient flows and the likely changes in the food web structure in tidal channels with contrasting anthropogenic nutrient inputs at a semi desert-macrotidal coastal system (northern Argentine Patagonia). The results showed an increase in the δ 13 C signatures of primary producers and in the δ 15 N signatures in all levels of the benthic food web, from primary producers to predators, with possible changes in the relative contribution of primary food sources for consumer in the tidal channel with high anthropogenic N input. This is an example on the extent of the distribution of anthropogenic N into natural systems, flowing through the food web from terrestrial origin to coastal marine components.Fil: Becherucci, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Alvarez, María Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; ArgentinaFil: Iribarne, Oscar Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Martinetto, Paulina Maria del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentin
Extracellular ATP and adenosine in tumor microenvironment: Roles in epithelial–mesenchymal transition, cell migration, and invasion
No full textUnder nonpathological conditions, the extracellular nucleotide concentration remains constant and low (nM range) because of a close balance between ATP release and ATP consumption. This balance is completely altered in cancer disease. Adenine and uridine nucleotides are found in the extracellular space of tumors in high millimolar (mM) concentrations acting as extracellular signaling molecules. In general, although uridine nucleotides may be involved in different tumor cell responses, purinergic signaling in cancer is preferentially focused on adenine nucleotides and nucleosides. Extracellular ATP can bind to specific receptors (P receptors) triggering different responses, or it can be hydrolyzed by ectoenzymes bound to cell membranes to render the final product adenosine. The latter pathway plays an important role in the increase of adenosine in tumor microenvironment. In this study, we will focus on extracellular ATP and adenosine, their effects acting as ligands of specific receptors, activating ectoenzymes, and promoting epithelial–mesenchymal transition, migration, and invasion in cancer cells. Finding the roles that these nucleotides play in tumor microenvironment may be important to design new intervention strategies in cancer therapies.Fil: Alvarez, Cora Lilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; ArgentinaFil: Troncoso, María Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; ArgentinaFil: Espelt, Maria Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Físico-Química Biológicas "Prof. Alejandro C. Paladini". Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Físico-Química Biológicas; Argentin
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