Mirá cómo luchamos: Reflexiones sobre la acción de repudio a Darthés en Brasil; Look how we fight: Analysis on the action of repudiation to Darthés in Brazil Camezzana, María Daniela Desde el 3 de junio de 2015, se multiplicaron las actuaciones colectivas que interpelan los modos establecidos de producir lo cotidiano, abriendo nuevas preguntas sobre el lugar del cuerpo en las prácticas políticas callejeras y la posibilidad de construir la hospitalidad (López, 2019) necesaria para reunir diversas formas de existencia dentro del movimiento feminista. En este sentido, el presente trabajo se propone analizar la acción que realizaron residentes argentinas en San Pablo, Brasil, bajo el lema "El repudio a Juan Darthés cruza fronteras" cuando tomaron conocimiento del viaje del actor acusado de violación a dicha ciudad tras la conferencia de prensa que brindó el Colectivo Actrices Argentinas. Entendiendo que la misma marcó un hito en la causa feminista argentina, se abordará como un espacio liminal que habilita una lectura en tanto producto mediático y otra como acontecimiento situado en un marco de enunciación mayor que las actrices venían construyendo con sus anteriores apariciones. En segundo lugar, no solo se considerarán las imágenes, consignas y otros elementos significantes utilizados durante la acción realizada en la Avenida Paulista sino que se tendrán en cuenta a partir de las impresiones que relatan las participantes en la entrevista de campo, lo que quedó resonando en “el cuerpo” afectado en la experiencia y las repercusiones recibidas luego de la irrupción callejera. A modo de conclusión, se consignarán también las instancias de negociación con las participantes que posibilitaron la construcción de una noción compartida de los riesgos “palpables” en el contexto local. A partir de la cual se repensaron los sentidos de agencia social empleados a priori en otros artículos sobre performances.; Since June 3, 2015, collective actions that question the established ways of producing the daily life, opening new questions about the place of the body in street political practices and the possibility of building the hospitality necessary to gather various forms of existence inside the feminist movement. In this sense, the present work intends to analyze the action carried out by Argentine residents in São Paulo, Brazil, under the slogan "The repudiation of Juan Darthés crosses borders" when they took knowledge about the trip of the actor accused of rape after the conference press provided by the Actresses Argentinas Collective. Understanding that it marked a milestone in the Argentine feminist cause, it will be approached as a liminal space that enables a reading as a media product and another as an event inscribed in a framework of greater enunciation that the actresses had been building with their previous appearances. Secondly, not only will the images, slogans and other significant elements used during the action carried out on Avenida Paulista be considered, also be taken into account the impressions of the participants expressed in the interview, which resonated in " the body” affected by the experience and the repercussions received after the street performance. By way of conclusion, the negotiation instances with the participants that made possible the construction of a common notion of “feel” risks in the local context will also be included. From which the senses of social agency used a priori in other articles on performances were reviewed.

El rol protagónico de la Confederación Obrera Regional Argentina en la huelga general del Centenario, mayo de 1910; The leading role of the Argentine Regional Workers Confederation in the Centennial general strike, May 1910 Belkin, Alejandro Marcelo El año 1910 constituye un momento clave en la historia argentina por el Centenario de la Revolución de mayo y un punto de inflexión en la historia del movimiento obrero argentino por la huelga general y la represión. En este artículo nos propusimos indagar en la estrategia del sindicalismo revolucionario local hacia la huelga general del Centenario. En ese marco, examinamos el rol desempeñado por la Confederación Obrera Regional Argentina en los sucesos que derivaron en la medida de fuerza. Asimismo, analizamos las diferentes respuestas elaboradas por el movimiento obrero ante los distintos tipos de protestas, el amplio apoyo a las luchas de carácter económico y el escaso respaldo a la lucha política. Hemos utilizado diversos tipos de fuentes, publicaciones políticas y gremiales, diarios comerciales y documentos oficiales; The year 1910 constitutes a key moment in Argentine history for the Centennial of the May Revolution and a turning point in the history of the Argentine labour movement due to the general strike and repression. This article aim to investigate the strategy of the local revolutionary unionism, towards the Centennial general strike. In this context, we examine the role played by the Argentine Regional Workers Confederation in the events that led to the force measure. Likewise, we analyze the different responses prepared by the labour movement to the different types of protests, the broad support for economic struggles and the scant support for the political struggle. We have used various types of sources, political and union publications, business journals and official documents.

Distribution of the organic anion transporters Oat1 and Oat3 between renal membrane microdomains in obstructive jaundice Nosetto, Evangelina Cecilia; Campagno, Romina Valeria; Torres, Adriana Mónica; Brandoni, Anabel Relation between the renal function and the membrane environment where the organic anion transporters Oat1 and Oat3 are localized is scarce. The aim of this study was to examine the Oat1 and Oat3 distribution in different cellular fractions under physiological conditions as well as the effects of extrahepatic cholestasis on membrane distribution of both proteins. Besides, the potential role of jaundice serum on the Oat1 and Oat3 expression in suspensions of renal tubular cells was evaluated. Cellular and membrane fractions of renal cortex were obtained from control rats to evaluate Oat1 and Oat3 protein expressions. Other rats were subjected to bile duct ligation (BDL) or Sham operation to determine the membrane distribution of Oat1 and Oat3 between lipid raft domains (LRD) and non-LRD. Incubation of renal cortical cells with serum from Sham and BDL were also performed to study Oat1 and Oat3 protein expressions. In physiological conditions, Oat1 and Oat3 were concentrated in LRD. The pathology induced a shift of Oat1 from LRD to non-LRD, while Oat3 showed no changes in its distribution. In cells exposed to BDL serum, Oat1 protein expression in membranes significantly increased. For Oat3, no difference between groups was observed. The Oat1 redistribution to non-LRD in BDL could be favoring the increase in renal transport of organic anions previously observed. This change was specific to Oat1. The in vitro experiment allows to conclude that some component present in BDL serum is responsible for the alterations observed in Oat1 expression in cortical membranes.

Nuevo financiamiento nacional para vivienda: características e implementación de préstamos hipotecarios UVA en Rosario; New national financing for housing: characteristics and implementation of the UVA mortgage loans in Rosario Barenboim, Cintia Ariana Uno de los mayores problemas que tiene Argentina es la dificultad del acceso a la vivienda propia para los sectores medios. Si bien los créditos hipotecarios pueden ser una solución, no han tenido una gran participación, representando solo el 1,5% del PBI en el 2012. En respuesta, ese mismo año se lanzó el “Programa Pro.Cre.Ar” limitado parcialmente por el nuevo gobierno en 2016 que crea otro sistema de financiamiento basado en la “Unidad de Valor Adquisitivo” (UVA), actualizado con el Coeficiente de Estabilización de Referencia regido por el índice general de inflación. En este contexto el objetivo principal del artículo radica en analizar el nuevo sistema de financiamiento público UVA para obtener una vivienda propia en Rosario. La metodología es descriptiva, centrada en el análisis de contenido de documentos escritos (investigaciones, artículos periodísticos, documentos oficiales) y realización de entrevistas semi- estructuradas. Los resultados muestran que en sus comienzos no tuvo problemas, las cuotas eran bajas (similares a la de un alquiler) y los bancos públicos tuvieron mayor protagonismo pero desde el 2018 con la acelerada inflación, la devaluación de la moneda, los consecuentes incrementos de las UVA y tasas fijas hicieron que la demanda se redujera, prácticamente no habiendo solicitudes. Los resultados muestran que en sus comienzos no tuvo problemas, las cuotas eran bajas (similares a la de un alquiler) y los bancos públicos tuvieron mayor protagonismo pero desde el 2018 con la acelerada inflación, la devaluación de la moneda, los consecuentes incrementos de las UVA y tasas fijas hicieron que la demanda se redujera, prácticamente no habiendo solicitudes.; One of the biggest problems that Argentina has is the difficulty of access to own housing for the middle sectors. Although mortgage loans can be a solution, have not had a large participation, representing only 1.5% of GDP in 2012. In response, that same year the "Pro.Cre.Ar Program" was partially launched, which was then limited by the new government in 2016 that creates another financing system based on the "Purchase Value Unit" (UVA), updated with the Reference Stabilization Coefficient governed by the general inflation index. In this context, the main objective of the article is to analyze the new UVA public financing system to obtain a home of its own in Rosario. The methodology is descriptive, focused on the content analysis of written documents (research, journalistic articles, official documents) and semi-structured interviews. The results show that in its beginnings it did not have problems, the quotas were low (similar to that of a rent) and the public banks had greater protagonism but since 2018 with the accelerated inflation, the devaluation of the currency, the consequent increases of the UVA and fixed rates caused the demand to be reduced, with practically no requests.

A new abelisauroid (Dinosauria: Theropoda) from the Huincul Formation (lower Upper Cretaceous, Neuquén Basin) of Patagonia, Argentina Baiano, Mattia Antonio; Coria, Rodolfo Anibal; Cau, Andrea A new ceratosaurian theropod dinosaur, Huinculsaurus montesi gen. et sp. nov., is described here. This taxon is based on the last three dorsal vertebrae and the first and second sacral vertebrae found in association at Aguada Grande, Neuquén Province, Argentina. Although fragmentary, Huinculsaurus shows a unique mix of features which differentiates it from all other theropods, including the sympatric abelisaurid Ilokelesia, and is diagnosed by prezygapophyseal articular facets twice longer than wide, anterior centroparapophyseal lamina strongly developed as an extensive lateral lamina in the posterior dorsal vertebrae, pneumatic foramina located ventrally to the postzygodiapophyseal lamina in the posterior dorsal vertebrae, posteriorly tapering postzygapophysis pointed posteriorly, and an accessory lamina bisecting the parapophyseal centrodiapophyseal fossa in the posterior dorsal neural arches. Phylogenetic analyses recovered Huinculsaurus as most closely related to the Late Jurassic Elaphrosaurus than to other Cretaceous abelisauroids, suggesting the persistence of the elaphrosaurine lineage in South America up to the early Late Cretaceous.

Pasado y presente en la obra de Natalio Botana: Lecturas de un historiador de la libertad, el poder y la historia. Conversaciones con Fernando Rocchi (EDHASA 2019); Past and present in the work of Natalio Botana: readings of a historian of freedom, power and history. Conversations with Fernando Rocchi (EDHASA 2019) Bragoni, Elsa Beatriz El artículo reflexiona sobre el reciente libro de Natalio Botana en el que traza su propia biografía intelectual en conexión con la historia política contemporánea. Escoge algunos nudos fundamentales (legitimidad – gobierno limitado- federalismo – partido político) con el propósito de puntualizar interrogantes, conceptos y procedimientos de investigación que gravitaron en la renovación de la historiografía política del siglo XIX argentino y latinoamericano.; This article reflects on Natalio Botana´s recent book in which he traces his own intellectual biography in connection with contemporary political history. It selects fundamental key issues (legitimacy - limited government - federalism - political party) with the purpose of clarifying questions, concepts and research procedures that weighed on the renewal of political historiography of the 19th century in Argentina and Latin America.

Trielectrode plasma reactor for water treatment Giuliani, Leandro Estanislao; De Angelis, L.; Díaz Bukvic, Gema; Zanini, Matías; Minotti, Fernando Oscar; Errea, María Inés; Grondona, Diana Elena Water pollution due to emerging organic pollutants, such as agrochemicals, has become a topic of growing interest worldwide. The increase of pollutants in aquatic systems stimulated the development of new strategies for water remediation. Plasma technology is an advanced oxidation process which has proved to be an efficient method for organic matter degradation. In this work, a novel design of a trielectrode plasma reactor based on a dielectric barrier discharge extended to a third electrode operated in ambient air is presented. The water to be treated flows through a gutter with low impedance and far from the electrodes connected to the voltage sources. The reactor operates in ambient air, and it does not rely on the use of expensive inert gases. The design of the reactor is easily scalable. The performance of the reactor, in terms of the removal efficiency and the energy yield, was tested in an aqueous solution of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D), one of the most widely used around the world. The reactor presents a good efficiency in the removal of the herbicide 2,4-D and values of energy yield of about 240 mg/kW h.

Quadratic helicity and cosmological magnetic fields Akhmet'ev, Peter; Cirilo, Diego Julio; Smirnov, Alexandr In this work, the quadratic helicity χB(2) is discussed from the physical and topological points of view. We show, after the introduction of a mathematical description of the properties of helicity and quadratic helicity in the context of standard dynamo equations, examples of the importance of these high invariants in cosmological scenarios. These scenarios consider extensions of the standard model and extensions of GR.

Physics of in vitro magnetofection. Effect of magnetic transport and redistribution of nanoparticles Arciniegas Vaca, Magda Lorena; Pasquevich, Gustavo Alberto; Mykhaylyk, Olga; Mele, Nicolás Germán; Goya, Rodolfo Gustavo; Sanchez, Francisco Homero A comprehensive study of relevant aspects of the physics behind in vitro magnetic assisted transfection, or magnetofection is presented. Magnetofection experiments were performed as a function of culture-magnet distance for a fixed time of 30 min, as a function of time for a fixed separation of about 1 mm, and under special geometries chosen to elucidate the relative effects of gravitational and magnetic forces. It is shown that under appropriate conditions, in vitro magnetofection can be performed with almost equal easiness in any desired space direction, even against gravity. Redistribution of magnetic nanoparticles in a colloid, with an initial uniform distribution, was studied with the same experimental setup used in magnetofection experiments, as a function of time, and as a function of culture-magnet relative position. It was found that magnetic nanoparticles tend to arrange into concentrated regions with ring or circle shapes, and that final distribution depends strongly on relative position. Cellular uptake of magnetic nanoparticles was estimated for standard magnetofection and for no applied magnetic field experiments. A consistent description of results is given by comparing magnetofection efficiency, nanoparticles uptake and redistribution experiments. The results presented here constitute novel information that will contribute to gaining deeper understanding of how magnetofection proceeds and how can be improved. They impact directly on in vivo procedures, providing conceptual tools to optimize setup geometry and magnetic field application time.

El papel del análisis financiero en la identificación de las incertidumbres sobre empresa en marcha; The role of financial analysis in identifying uncertainties about going concern Briozzo, Anahi Eugenia; Albanese, Diana Ester; Pullés, Yanina; Di Rocco, Paula El objetivo de este trabajo es analizar empíricamente la relación de los ratios financieros y las características de la empresa, con la inclusión de un párrafo de énfasis por la incertidumbre sobre empresa en marcha en el informe del auditor. Se estudian las firmas que realizan oferta pública de sus acciones en los mercados de valores de Argentina. El análisis estadístico se realiza en dos etapas: análisis bivariado con tests no paramétricos y análisis multivariado empleando una regresión probit. Los resultados del análisis bivariado muestran que la antigüedad, la razón corriente y los ratios de endeudamiento están significativamente asociados con la incertidumbre de empresa en marcha. En el análisis multivariado son relevantes con efecto negativo el margen sobre ventas y la antigüedad, mientras que el ratio de endeudamiento muestra un efecto positivo.; The aim of this work is to empirically analyze the relationship of financial ratios and firm characteristics with the inclusion of an emphasis paragraph for uncertainty related to the going concern assumption in the auditor’s report. The firms that make public offers of their shares in the stock markets of Argentina are studied. Statistical analysis is carried out in two stages: bivariate analysis with non-parametric tests, and multivariate analysis using a probit regression. The results of the bivariate analysis show that the age of the firm, current ratio, and solvency ratios are significantly associated with the uncertainty of a going concern. In the multivariate analysis, the margin on sales and the age of the firm are relevant, with a negative effect on the likelihood of the firm having a report with an emphasis on uncertainty of a company in progress, while the debt ratio shows a positive effect.

Tulio Halperin Donghi y sus contextos, 1962 Viale, Adrián Mariano Introducción a la reedición del artículo de Tulio Halperin Donghi: "Historia y larga duración: examen de un problema".

A new megaflora (leaves and reproductive structures) from the Huancané Formation (Lower Cretaceous), Peru Martinez, Leandro Carlos Alcides; Pacheco Huacallo, Edgar; Pujana, Roberto Roman; Padula, Horacio We describe fossil leaves and reproductive structures remains from the Lower Cretaceous of Peru. A great part of the plant fossils are very well preserved, and they come from three different stratigraphic levels of the Huancane Formation in a single locality close to Cusco City. The fossil flora is dominated by Brachyphyllum, Cupressinocladus, Podozamites, leaves assigned to the Araucariaceae and Araucarites Presl. Other leaf fossil-genera found are: Weichselia, Sagenopteris, Sphenopteris, and Pachypteris. This fossil assemblage is consistent with the age inferred for the Huancane Formation, which was based on biostratigraphic and isotopic studies. The plant assemblage suggests a forest canopy dominated by conifers, with an understore composed by ferns (Weichselia) and putative pteridosperms. These new data increase the knowledge of the palaeofloristic composition of the Cretaceous flora of Peru, contribute to the fossil record of South America, and particularly to the palaeoflora near equatorial regions.

Data of ureagenesis from ammonia, glutamine and alanine, and mitochondrial aquaporin-8 expression in thioacetamide-treated hepatocytes Capiglioni, Alejo Matías; Alvarez, María de Luján; Marinelli, Raul Alberto We present data about the synthesis of urea from different substrates, i.e., free ammonia, glutamine and alanine in primary cultured rat hepatocytes treated or untreated with the model hepatotoxic agent thioacetamide (TAA). We also provide data about the expression of mitochondrial aquaporin-8 (mtAQP8), a hepatocyte channel protein which facilitates ammonia diffusion into mitochondria to supply the urea cycle. Ammonia-derived ureagenesis was significantly inhibited by about 30% while that from the both amino acids resulted unaffected in TAA-treated hepatocytes. Protein expression of mtAQP8 was decreased by about 80% after TAA treatment. These data can be useful for the understanding of the mechanisms of drug-induced hepatic dysfunction.

Further results on why a point process is effective for estimating correlation between brain regions Cifre, I.; Zarepour Nasir Abadi, Mahdi; Horovitz, S. G.; Cannas, Sergio Alejandro; Chialvo, Dante Renato Signals from brain functional magnetic resonance imaging (fMRI) can be efficiently represented by a sparse spatiotemporal point process, according to a recently introduced heuristic signal processing scheme. This approach has already been validated for relevant conditions, demonstrating that it preserves and compresses a surprisingly large fraction of the signal information. Here we investigated the conditions necessary for such an approach to succeed, as well as the underlying reasons, using real fMRI data and a simulated dataset. The results show that the key lies in the temporal correlation properties of the time series under consideration. It was found that signals with slowly decaying autocorrelations are particularly suitable for this type of compression, where inflection points contain most of the information.

Prática de atividade física, a percepção do ambiente e o perfil sociodemográfico nos diferentes distritos de saúde do SUS do município de Ribeirão Preto – SP; Practice of physical activity, a perception of the environment and the sociodemographic profile in the different SUS health districts of the city of Ribeirão Preto - SP Hodniki, Paula Parisi; Teixeira, Carla Regina de Souza; Dias, Mirele Coutinho; Lima, Rafael Aparecido Dias; Lavin Fueyo, Julieta; Binhardi, Barbara Aparecida; Istilli, Plinio Tadeu; Marques, Jennifer Vieira Paschoalin O conhecimento da percepção do ambiente das pessoas para a prática de atividade física e sua distribuição nos distritos de saúde no município contribui para o planejamento nas intervenções públicas em saúde. O objetivo do estudo foi analisar a percepção do ambiente para a prática de atividade física, e o perfil sociodemográfico dos usuários do SUS do município de Ribeirão Preto – SP, coletados nos cinco distritos de saúde da cidade. Dos 719 participantes, 71,20% são do sexo feminino e 28,80% do masculino. A maioria dos participantes tinha idade de 34 a 59 anos (40,80%), 40,80% pessoas com ensino fundamental incompleto, 51,90% das pessoas são da classe econômica C, 43,40% referiram estar com emprego e (70,10%) e apresentar DCNT. Em relação a prática de atividade física, 21,00% praticavam como deslocamento e 16,00% no lazer, em relação à recomendação. A maioria percebeu que o ambiente em relação ao acesso às conveniências, segurança no trânsito, segurança geral, apoio social para a prática de atividade física e poluição geral, era ruim ou regular. Foram encontradas diferenças na percepção do ambiente entre os distritos de saúde. Essas informações são necessárias para a elaboração de intervenções com trabalho multiprofissional para a educação em saúde. E, para repensarmos sobre o ambiente construído e políticas de incentivo e apoio social para a prática de atividade físicas das pessoas com e sem doenças crônicas que utilizam o Sistema Único de Saúde.; The knowledge of people's perception of the environment for the practice of physical activity and its distribution in health districts in the municipality contributes to the planning of public health interventions. The objective of the study was to analyze the perception of the environment for the practice of physical activity, and the sociodemographic profile of SUS users in the city of Ribeirão Preto - SP, collected in the five health districts of the city. Of the 719 participants, 71.20% are female and 28.80% are male. Most of the participants were aged between 34 and 59 years (40.80%), 40.80% people with incomplete elementary education, 51.90% of people are from economic class C, 43.40% reported having a job and (70.10%) and have CNCD. Regarding physical activity, 21.00% practiced commuting and 16.00% at leisure, in relation to the recommendation. Most realized that the environment in relation to access to conveniences, traffic safety, general safety, social support for the practice of physical activity and general pollution, was bad or regular. Differences were found in the perception of the environment between health districts. This information is necessary for the elaboration of interventions with multiprofessional work for health education. And, to rethink about the built environment and policies of incentive and social support for the practice of physical activity of people with and without chronic diseases who use the Unified Health System.

The importance of denitrification performed by nitrogen-fixing bacteria used as inoculants in South America Zilli, Jerri Édson; Alves, Bruno Jose Rodrigues; Rouws, Luc Felicianus Marie; Simões-Araujo, Jean Luiz; de Barros Soares, Luis Henrique; Cassan, Fabricio Dario; Obando Castellanos, Dolly Melissa; O'Hara, Graham Replacing synthetic fertilizers by biological nitrogen fixation (BNF) is regarded as an environmentally sound practice, but some diazotrophic bacteria are capable of emitting N2O by denitrification. The ability to use nitrate represents an ecological advantage for the survival of some microorganisms under O2-limiting conditions, but may contribute to increased N2O emissions. Scope The importance of denitrification performed by N2-fixing bacteria used as inoculants in South America is discussed, especially the possibility of these bacteria act as N2O source or sink. Conclusions There is no doubt of the importance of BNF as a sustainable N source for plants. Through genome investigation, we demonstrated that some strains widely used as inoculants for BNF harbor the entire denitrification pathway to reduce nitrate to N2. Others contain none, or only some of the denitrification genes, resulting in complete absence of denitrification or production of intermediates such as NO2−, NO or N2O. Evidence of differential effects of bacterial strains on soil N2O were reported, but more studies are still needed to affirm crop inoculation can be a driver for source or sink of this gas. Finally, considerations were made about BNF as an indispensable resource to indirectly mitigate greenhouse gas emissions in agroecosystems.

La distribución y organización del riego en San Salvador de Jujuy: Niveles de estatalidad y municipalización entre las décadas de 1860 y 1890; The distribution and organization of irrigation in San Salvador de Jujuy: Levels of statehood and municipalization between the 1860s and 1890s Hernández Aparicio, Nicolás El presente artículo se aboca al rol de la municipalidad de San Salvador de Jujuy en torno a la reglamentación y distribución del agua para riego. La aparición de ese nivel de gobierno data del año 1856, y su puesta en funcionamiento y normalización incluyó, entre otras cuestiones, los elementos normativos que aquí consideramos. Trabajos anteriores han analizado ese contexto y la problemática derivada entre los poderes provincial y municipal para legislar el recurso hídrico, en este artículo pretendemos abordar las décadas de 1860 hasta 1890, que de alguna manera estuvieron signadas por un mayor desenvolvimiento institucional aunque, como se buscará demostrar, no implicó que la municipalidad adquiriera las facultades subjetivas de mando en términos weberianos, para poder disponer de los cánones de riego y los funcionarios destinados a vigilar el reparto del agua.; This article focuses on the role of the municipality of San Salvador de Jujuy in the regulation and distribution of water for irrigation. The appearance of that level of government dates from 1856, and its implementation and standardization included, among other issues, the normative elements that we consider here. Previous work has analyzed this context and the problem derived between the provincial and municipal powers to legislate the water resource, in this article we intend to address the decades of 1860 to 1890, which were somehow marked by a greater institutional development although, as will be sought To demonstrate, it did not imply that the municipality acquired the subjective powers of command in Weberian terms, in order to have the irrigation fees and the officials destined to monitor the distribution of water.

Estudio preliminar de los efectos de las radiaciones gamma sobre los glóbulos rojos humanos; Preliminar study of the effects of gamma radiations on human red blood cells Estrada, E.; Castellini, H.; Acosta, A.; Di Tullio, L.; Borraz, J.; Chinellato, A.; Tack, I.; D'Arrigo, M.; Riquelme, Bibiana Doris; Galassi, Mariel Elisa En este estudio se analizaron los parámetros viscoelásticos y de agregación en glóbulos rojos humanos sometidos a los procedimientos habituales de irradiación gamma con fines transfusionales. Las muestras fueron irradiadas a diferentes dosis a fin de determinar los posibles cambios hemorreológicos que pudieran afectar a la salud de los pacientes y su relación con las modificaciones bioquímicas observadas. Los resultados obtenidos muestran alteraciones en el tiempo de agregación, en la viscosidad superficial de membrana y en el tamaño de los agregados eritrocitarios en las muestras irradiadas, sugiriendo que el daño producido por la radiación ionizante afecta a las propiedades físicas de la membrana del glóbulo rojo en diferentes niveles; In this study, the alterations in viscoelastic and aggregation parameters of red blood cells were analyzed for usual gamma irradiation procedures for transfusion purposes. In order to determine possible hemorheological changes that may affect the health of patients and their relationship with the biochemical changes observed, the blood samples were irradiated at different doses. The results show alterations in the erythrocyte aggregation time, in the membrane surface viscosity and in the size of the aggregates in the irradiated samples, suggesting that the damage produced by the ionizing radiation affects the physical properties of red blood cell membrane at different levels.

Debris flow susceptibility mapping using frequency ratio and seed cells, in a portion of a mountain international route, Dry Central Andes of Argentina Esper Angillieri, María Yanina Debris flow and floods represent one of the main natural hazards that impact transport infrastructure, causing serious damage, economic losses and hinder regional economic development. These processes are eventually associated with massive traffic cuts and direct damage to road structures. To enable the prevention of such consequences, this paper employs statistical modeling techniques, various instability factors and geomorphological mapping to generate debris flow susceptibility maps in a portion of an important route on the Dry Andes of San Juan in the Agua Negra River basin, Argentina. A debris flows inventory map was prepared using satellite images and field checks. The debris flows inventory was randomly divided into a model dataset 80% (47 debris flows) and remaining 20% (12 debris flows) data was used for validation purpose. The instability factors chosen that influence debris flows occurrence were: elevation, slope angle, slope aspect, solar radiation, topographic wetness index, stream power index, topographic position index, Melton ruggedness number, terrain ruggedness index, sediment transport capacity index, plan curvature, profile curvature, lithology, distance to road and proximity to stream. Using these factors, six different models of debris flow susceptibility were calculated by Frequency ratio (Fr). Lithology (igneous complex) was found to be important debris flows-related factor in the study area. The precision of the results was evaluated by receiver operating characteristic (ROC) analysis. According to the area under the curve (AUC) the models of all flow track and natural breaks and all flow track and geometrical interval were 0.83 and 0.84, respectively, showing a practically identical predictive capacity.

The Choiyoi Group in the Cordón del Plata range, western Argentina: structure, petrography and geochemistry Martinez, Amancay Nancy; Gallardo, Adrian Hugo; Giambiagi, Laura Beatriz; Tobares, María Laura El Grupo Choiyoi del Permo-Triásico es una de las suites volcánicas y sedimentarias más conspicuas del sur de Sudamérica, considerada crítica para comprender la evolución geológica de los márgenes occidentales de Gondwana. En este sentido, se examinaron datos petrográficos, geoquímicos y estructurales para dilucidar mejor el carácter físico y las condiciones de emplazamiento de la unidad en el área del Cordón del Plata, dentro de la Cordillera Frontal de Mendoza, Argentina. El sitio es representativo del magmatismo y la deformación a través de diferentes ciclos andinos. Los resultados del estudio indican tres facies litológicas de aumento de la acidez hacia arriba. Las unidades máficas consisten en basaltos, brechas andesíticas y andesítas en la base de la secuencia. Predominan las rocas félsicas, como las riodacitas, los granitos y las tobas soldadas. La zona de falla de La Polcura - La Manga es la característica estructural más prominente de la región, que presumiblemente controla el emplazamiento de brechas e ignimbritas dentro de los miembros medios y superiores. Estas variaciones en la composición sugieren una evolución magmática de la subducción a un entorno de ruptura después de la orogenia de San Rafael en el Paleozoico tardío. En esta línea, se observó que el Choiyoi Inferior cubría las estructuras de San Rafael, lo que indica que la compresión cesó antes de la extrusión volcánica. Los datos de geoquímica indican que las rocas máficas son en su mayoría vulcanitas calcoalcalinos de alto potasio derivados de la cuña del manto por encima de la zona de subducción. En contraste, las rocas felsicas van desde las riolitas con alto contenido de potasio hasta las shoshonitas, típicamente pobres en Eu. Esto indica la fusión parcial de un manto litosférico en una corteza media a delgada.; The Choiyoi Group from the Permo-Triassic, is one of the most conspicuous volcano-sedimentary suites of southern South America, considered critical to understand the geological evolution of the western margins of Gondwana. In this regard, petrography, geochemistry, and structural data were examined to better elucidate the physical character and emplacement conditions of the unit in the Cordón del Plata range, within the Frontal Cordillera of Mendoza, Argentina. The site is representative of the magmatism and deformation through different Andean cycles. Results of the study indicate three facies of increasing felsic composition upwards. Mafic units consist of basalts, andesite and andesitic breccias at the base of the sequence. Felsic rocks such as rhyodacites, granites and welded tuffs are predominant above. The fault zone of La Polcura – La Manga is the most prominent structural feature in the region, which presumably controlled the emplacement of breccias and ignimbrites within the middle and upper members. These compositional variations suggest a magma evolution from subduction to a rifting environment after the San Rafael orogeny in the Late Palaeozoic. In this line, the Lower Choiyoi was observed to overlie the San Rafael structures indicating thus, that compression ceased before the volcanic extrusion. Geochemistry data indicate that mafic rocks are mostly high-potassium, calc-alkaline volcanics derived from the mantle wedge above the subduction zone. In contrast, the Upper Choiyoi corresponds to high-potassium rhyolites to shoshonites, typically depleted in Eu. This indicates partial melting of a lithospheric mantle in an average to thin crust.