http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/571 2026-06-04T00:21:37Z 2026-06-04T00:21:37Z http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/2741 2026-01-15T21:19:42Z 2024-01-01T00:00:00Z

The response of trophic interaction networks to multiple stressors along a large-scale latitudinal range in the Southern Hemisphere Ecological networks offer valuable insights into community structure, key species identification, and ecosystem management. Understanding how these networks respond to global change stressors is of increasing interest, especially along geographical gradients. This review summarizes potential stressor responses in marine food webs from the Southwest Atlantic to the Antarctic (45 - 78°S), encompassing areas such as San Jorge Gulf, Beagle Channel, Burdwood Bank, Scotia Sea, Potter Cove, and the Weddell Sea in Antarctica. The objectives are: 1) to describe the structure of marine food webs along this latitudinal axis using a network approach; 2) to identify predominant global change-related stressors affecting each ecosystem; and 3) to summarize observed food web changes and hypothesize on stressor impacts. The effects of stressors were primarily reviewed at the species level. Alternative hypotheses for each study area were formulated considering: a) main stressors; b) impacted parameters; c) node-level species properties; and d) network-level food web properties. Global warming emerges as the most common stressor among the studied areas across the latitudinal gradient, except in the Beagle Channel and Burdwood Bank, where alien species introduction and fisheries are more influential. We offer a series of alternative hypotheses on how warming may affect the food webs. This review emphasizes the benefits of using a network approach to understand and predict stressor effects in Southern Hemisphere marine ecosystems. This approach provides a holistic understanding of ecosystems, which enhances our ability to identify key species and their interactions, offering insights for ecosystem management and conservation in the face of global change stressors. Revista con referato; Fil: Doyle, Santiago Raúl. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Doyle, Santiago Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.; Fil: Marina, Tomas Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina.; Fil: Rodriguez, Iara Diamela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.; Fil: Rodriguez, Iara Diamela. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Kortsch, Susanne. University of Helsinki; Finlandia.

2024-01-01T00:00:00Z http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/2740 2026-01-15T21:19:42Z 2022-01-01T00:00:00Z

Heterogeneidad de la recuperación de residuos en municipios del Área Metropolitana de Buenos Aires : reflexiones para la promoción de políticas inclusivas En Argentina, las políticas de gestión de residuos tienden a apoyarse en una imagen bastante uniforme de los recuperadores. Este artículo explora, mediante un estudio de base empírica propio y fuentes secundarias, algunas características de distintos tipos de recuperadores del Área Metropolitana de Buenos Aires y, al hacerlo, interpela esa mirada homogeneizadora. Se sostiene que, para lograr la inclusión socio-laboral de este sector, las políticas deben atender a su heterogeneidad, sus expectativas, sus modalidades de trabajo y relaciones.; In Argentina, waste management policies tend to rely on a fairly uniform image of waste pickers. This article explores, through an empirical study and secondary sources, some characteristics of different types of waste pickers in the Buenos Aires Metropolitan Area and, in doing so, challenges this homogenizing view. It argues that, to achieve the socio-labor inclusion of this sector, policies must address its heterogeneity, its expectations, its work practices, and its relationships.; Na Argentina, as políticas de gestão de resíduos tendem a se basear em uma imagem bastante uniforme dos catadores de materiais recicláveis. Este artigo explora, por meio de um estudo empírico e fontes secundárias, algumas características de diferentes tipos de catadores na Região Metropolitana de Buenos Aires e, ao fazê-lo, questiona essa visão homogeneizadora. Argumenta-se que, para alcançar a inclusão sociolaboral desse setor, as políticas devem abordar sua heterogeneidade, suas expectativas, suas práticas de trabalho e seus relacionamentos. Revista con referato; Fil: Saidon, Mariana. Universidad Nacional de San Martin. Escuela de Politica y Gobierno. Area de Ambiente y Politica; Argentina.; Fil: Sorroche, Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15; Argentina.; Fil: Dimarco, Sabina Alejandra. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Dimarco, Sabina Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.

2022-01-01T00:00:00Z http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/2738 2026-01-15T21:19:41Z 2024-01-01T00:00:00Z

Green synthesis and antibacterial-antibiofilm properties of biogenic silver nanoparticles The biosynthesis of metallic nanoparticles is gaining prominence as an alternative to traditional physicochemical methods, offering several advantages such as simplicity, non-toxicity, lower energy requirements and short reaction times leading to environmentally sustainable processes. The aims of this work were: to study the extracellular biosynthesis of silver nanoparticles (AgNPs) by Pseudomonas extremaustralis 2E-UNGS, to characterise the shape, monodispersity and size of AgNPs, to explore their antimicrobial and antibiofilm activities, and to evaluate the role of nitrate reductase activity in the biosynthesis process. The novelty of this work relies on the development of a green and sustainable method for the synthesis of stable AgNPs with optimal properties for potential applications in antimicrobial materials, especially when incorporated into polymeric matrices or used as agrochemical substitutes. Optimal conditions for the biosynthesis of spherical AgNPs were determined to be pH 7, 38 ?C, 4 h of darkness and 120 rpm using stationary phase culture supernatants of P. extremaustralis 2EUNGS. The involvement of extracellular nitrate reductase in AgNP biosynthesis was confirmed by enzymatic assays and supported by bioinformatics analysis, which identified the presence of the napA2 gene linked to the nirBD cluster. Antimicrobial assays demonstrated the inhibitory effect of AgNPs against both Gram-positive and Gram-negative bacteria, including Pseudomonas aeruginosa PA01 in both planktonic and biofilm states. In addition, the potential application of AgNPs in innovative antibacterial polymers was explored by incorporating them into polyurethane matrices either alone (PU-AgNP) or in combination with crystal violet as a photosensitizer (PU-AgNP-CV). Subsequent inoculation with a clinical isolate of Pseudomonas aeruginosa resulted in significant reductions in viable bacterial counts on both PU-AgNP-CV and PU-AgNP. Biogenic AgNPs showed antibacterial and antibiofilm properties for new antimicrobial material development. Revista con referato; Fil: Ferreira, Maria Laura. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Lazzarini Behrmann, Irene Constanza. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Daniel, María Alejandra. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Sosa, Griselda Leonor. Universidad Nacional de General Sarmiento. Instituto de Ciencias.; Argentina.; Fil: Vullo, Diana S. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Owusu, Ethel. University College London. Departament Of Chemistry; Estados Unidos.; Fil: Parkin, Ivan P.. University College London. Departament Of Chemistry; Estados Unidos.; Fil: Allan, Elaine. University College London; Estados Unidos

2024-01-01T00:00:00Z http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/2739 2026-01-15T21:19:42Z 2023-01-01T00:00:00Z

Angustia y existencia : la psicología de Kierkegaard según Rollo May En el primer estudio sistemático sobre la psicología de Kierkegaard, Kierkegaard´s Psychology (1972), escrito en danés por Kresten Nordentoft, el autor considera que el primer intento de presentar las teorías psicológicas de Kierkegaard fue realizado por Rollo May en The Meaning of Anxiety (1950). Además de esta obra, en 1958, junto con Ernest Angel y Henri Ellenberguer, May edita Existence. A new dimension in Psychiatry and Psychology. El objetivo de este artículo consiste en describir el modo en que May concibe a Kierkegaard como “psicólogo”, a partir del análisis del existencialismo y su coincidencia con el psicoanálisis en el diagnóstico de la “crisis del individuo moderno”, tomando los conceptos de angustia y existencia como los principales ejes temáticos de la descripción; In the first systematic study of Kierkegaard’s psychology, Kierkegaard’s Psychology (1972), written in Danish by Kresten Nordentoft, the author considers that the first attempt to present Kierkegaard’s psychological theories was made by Rollo May in The Meaning of Anxiety (1950). In 1958, together with Ernest Angel and Henri Ellenberguer, May also edited Existence. A new dimension in Psychiatry and Psychology. The aim of this article is to describe the way in which May conceives Kierkegaard as a “psychologist”, based on the analysis of existentialism and its coincidence with psychoanalysis in the diagnosis of the “crisis of the modern individual”. For doing so, the concepts of anxiety and existence are taken as the main thematic lines of description.; No primeiro estudo sistemático da psicologia de Kierkegaard, *Kierkegaard's Psychology* (1972), escrito em dinamarquês por Kresten Nordentoft, o autor considera que a primeira tentativa de apresentar as teorias psicológicas de Kierkegaard foi feita por Rollo May em *The Meaning of Anxiety* (1950). Em 1958, juntamente com Ernest Angel e Henri Ellenberguer, May também editou *Existence: A new dimension in Psychiatry and Psychology*. O objetivo deste artigo é descrever a maneira como May concebe Kierkegaard como um “psicólogo”, com base na análise do existencialismo e sua coincidência com a psicanálise no diagnóstico da “crise do indivíduo moderno”. Para tanto, os conceitos de angústia e existência são tomados como as principais linhas temáticas de descrição. Revista con referato; Fil: Dip, Patricia Carina. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina.; Fil: Dip, Patricia Carina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.

2023-01-01T00:00:00Z