Role of estrone on the regulation of osteoblastogenes Crescitelli, Maria Carla; Rauschemberger, María Belén; Cepeda, Sabrina Belén; Sandoval, Marisa; Massheimer, Virginia Laura Although estradiol bone contribution has been deeply studied, little is known about the action of estrone. We investigated the direct action of estrone on osteoblasts growth and differentiation, with focus on the biochemical mechanism displayed by the estrogen. Murine calvarial osteoblast cultures in vitro exposed to 10 nM estrone were employed. Estrone enhanced gene expression of the osteogenic differentiation marker, Runx2 mRNA (150% above control). The hormone significantly increased cell proliferation (38% above control), nitric oxide production(108% above control), alkaline phosphatase activity (50% above control), in addition to stimulation of extracellular matrix mineralization. Using specific antagonists, we found that the mechanism of action of estrone involves estrogen receptor, nitric oxide synthase and MAPK signalling pathways participation. The hormone acts by its own and probably not via conversion to estradiol, since 17 B HSD inhibition did not affect the hormonal action. This work shows a novel action of estrone on bone cells promoting osteoblastogenesis.

Synthetic microfibers in marine sediments and surface seawater from the Argentinean continental shelf and a Marine Protected Area Ronda, Ana Carolina; Arias, Andres Hugo; Oliva, Ana Laura; Marcovecchio, Jorge Eduardo In this work, samples were collected from the Argentinean continental shelf –including a Marine Protected Area (MPA) - to assess the occurrence and distribution of synthetic microfibers (MFs), a widespread type of microplastic. MFs were present at 100% of the samples showing an average concentration of 182.85 ± 115.14 particles per Kg of dry sediment and 0.14 ± 0.08 items per m3 of marine water. MFs less than 1 mm were the most abundant (56.4% and 63%, for sediment and surface seawater respectively), followed by 1–2 mm and then 2–3 mm. In regards to the colour, both sediments and water had the major percentage of black MFs (25.6% and 28%, respectively) and the lowest one of green MFs (2.5% and 3%, respectively). Finally, MFs content in sediments was inversely correlated with depth (r = -0.93, p < 0.05). These findings provide the first evidence of microplastic contamination at the Argentinean continental shelf.

Una matriz crítica: Jesús Díaz y la vanguardia cultural en Cuba; A critical origin. Jesís Díaz and the cultural avant-garde in Cuba Garbatzky, Irina Ruth La trayectoria de Jesús Díaz ha tendido a leerse de manera binaria: entre el adentro o afuera de la isla, el apoyo o la crítica a la revolución. Si bien estas oposiciones se presentan como radicales en el contexto histórico y en su propia vida, también podría decirse que en su obra se incluyen algunas continuidades de valores y procedimientos aprendidos durante la vanguardia cultural. En este artículo se señalan algunos, los que brindan un marco para acercarlo a la figura del intelectual crítico, ideada por Ángel Rama (1983) cuando pensó en el complejo lugar de tensión que habitaron los escritores durante la tormenta revolucionaria.; The trajectory of Jesús Díaz has tended to be read in a binary way: between inside or outside the island, support or criticism of the revolution. Although these oppositions are presented as radicals in the historical context and in their own lives, it could also be said that in their work some continuities of values and procedures learned during the cultural vanguard are included. In this article some are pointed out, those that provide a framework to bring it closer to the figure of the critical intellectual, devised by Ángel Rama (1983) when he thought about the complex place of tension that the writers inhabited during the revolutionary storm.

Plantas que mantienen al ganado: Conocimiento campesino asociado a especies forrajeras en la Sierra de Ancasti (Catamarca, Argentina); Plants to raise livestock: Peasant knowledge associated to fodder species in Sierra de Ancasti (Catamarca, Argentina) Jiménez Escobar, Néstor David; Martínez, Gustavo Javier Las comunidades campesinas asociadas al pastoreo y a la ganadería -a pequeña escala- suelen tener un profundo conocimiento de los ambientes, de los ecosistemas y de las plantas en las que se crían sus animales. En este estudio se indagó el conocimiento asociado a las plantas forrajeras en la Sierra de Ancasti, Argentina (Chaco seco). Para ello se estableció qué tipo de ganado se cría en la zona, qué plantas son consumidas por los animales domésticos y en términos locales, qué se considera un forraje. Materiales y Métodos: Por medio de la técnica bola de nieve, 20 unidades domésticas participaron de las entrevistas abiertas y semiestructuradas, consultándoles específicamente por las especies forrajeras. El trabajo de campo se complementó con observación participante y caminatas guiadas junto a familias campesinas asociadas al pastoreo. Resultados: La producción local se relaciona principalmente al ganado caprino, ovino y vacuno. En relación a las plantas forrajeras, se encontraron 154 especies (correspondientes a 129 géneros, 51 familias). Se destaca el alto porcentaje de especies de origen nativo (78%). Según el Índice de frecuencia de mención, los forrajes más citados son: Cereus forbesii, Medicago sativa, Vachellia aroma, V. caven y Zea mays. Conclusiones: La riqueza de especies consumidas por los distintos tipos de ganado, el dominio de las especies nativas en la alimentación de los animales y la diversidad de tipos de hábito y partes de uso, son una muestra de la amplia diversidad biológica de la región. Asimismo, se definió el término de forraje, que para los pobladores de Ancasti está asociado al concepto de "mantener" al animal (alimentar, engordar, cuidar, aumentar la producción).; Peasant communities associated with small-scale livestock often have deep knowledge of the environment, ecosystems and plant species in which their animals are fed. In this study, knowledge associated with forage plants in the Sierra de Ancasti, Argentina (Dry Chaco) was inquired. Accordingly, we determined what types of livestock is raised in the area, what plants are consumed by domestic animals and, in local terms, what is considered a forage. M&M: By using the snowball technique, 20 households, related to livestock areas, participated in the open and semi-structured interviews. Study participants were specifically asked about forage species. Field work was complemented with participant observation and guided walks with peasant shepherd families related. Results: Local production is mainly related to goats, sheep and cattle. Regarding forage plants, 154 species were found (corresponding to 129 genera, 51 families). The high percentage of species of native origin is significant (78%). According to the Frequency Index, the most widely cited kinds of forage are: Cereus forbesii, Medicago sativa, Vachellia aroma, V. caven y Zea mays. Conclusions: The variety of species consumed by the different types of livestock, the prevalence of native fodder species and the diversity of habits and parts used highlights the region’s rich biological diversity. Likewise, the forage term was defined by Ancasti’s inhabitants as associated with the concept of “raise” the animal (feeding, fattening, caring or increasing production).

Elecciones en Uruguay: algunas claves para analizar la segunda vuelta y el surgimiento de ''nuevos'' actores de derecha Mercado, Ana Belen “Cambiar está bueno” y “Lacalle Pou es Macri” son consignas que se leen por Montevideo. El 27 de octubre, mientras en la Argentina se festejaba el triunfo de la fórmula Fernández-Fernández, en Uruguay se oficializaba la segunda vuelta. Esta elección es particular en varios aspectos que intentaremos desarrollar en este artículo . Existe un proceso de desgaste del Frente Amplio que tras 15 años de gobierno lo hace receptor de críticas y demandas insatisfechas. La economía no crece al ritmo que lo hizo durante las administraciones anteriores, la tasa de desempleo es la más alta de los últimos 12 años (9,47%) y existe un alto nivel de endeudamiento -63,4% del PBI en 2018 . Esto no significa un retorno del electorado a los partidos tradicionales, sino que emergen nuevos actores políticos que capitalizan el descontento desde la derecha. Así surge Cabildo Abierto, una fuerza de derecha cuyo candidato, Guido Manini Ríos, es el excomandante en jefe de las fuerzas armadas. Esto lleva a considerar el avance de las derechas mediante distintas estrategias (electorales partidarias, no partidarias, no electorales) en un proceso regional más amplio.

A general method to produce mesoporous oxide spherical particles through an aerosol method from aqueous solutions Zelcer, Andrés; Franceschini, Esteban Andrés; Lombardo, Maria Veronica; Lanterna, Anabel Estela; Soler Illia, Galo Juan de Avila Arturo Mesoporous transition metal oxides (MTMO) with large surface area, nanocrystalline framework, and controlled porosity have brilliant prospects in fields such as energy, environment, catalysis, or nanomedicine. However, the green, reproducible, and scalable production of MTMO are still a bottleneck for their industrial applications. Although spray-drying methods permit to obtain MTMO in a potentially scalable fashion, the use of highly acidic alcoholic precursor solutions presents two main limitations: corrosion and flammability, which hinder their production in large quantities and lower cost. In this work, we present a general, reproducible, simple, and environment-friendly aerosol method for the synthesis of spherical MTMO particles from mildly acidic aqueous solutions. Acetylacetonate and acetate are used as condensation-controlling agents. Mixed oxides of high valence cations (M(IV) such as Ti, Zr, Ce, and their mixed oxides) were prepared with a yield over 95%, virtually without changing the formulation of the precursor mixture, which can be extended potentially to M(III) or M(V) oxides. The replacement of organic solvents by water allows working in air atmosphere, making this approach much safer, cheaper and environmentally friendly than the current aerosol-based routes. We also present the beneficial effect of mesoporous titania spheres as an additive to nickel electrodes used in the hydrogen evolution reaction, as a demonstrator to potential applications. A threefold increase in the electrocatalytic hydrogen production is observed in mesoporous titania-modified nickel electrodes with respect to a pure nickel catalyst. This performance can be further improved ~25% upon UVA-visible irradiation, due to the photoelectrocatalytic effect of the mesoporous TiO2.

Taxonomic revision of Chusquea subg. Magnifoliae and Chusquea subg. Platonia (Poaceae, Bambusoideae, Chusqueinae) in Peru Guerreiro, Carolina Inés; Alegría Olivera, J. José; Vega, Andrea Susana Subtribe Chusqueinae was previously composed of the genera Neurolepis and Chusquea. Following molecular-based phylogenetic studies, all species of Neurolepis were transferred to Chusquea and placed in two new subgenera: Magnifoliae and Platonia. Complete keys for the identification of taxa within C. subg. Magnifoliae and C. subg. Platonia are lacking. The present paper provides five new reports and a taxonomic revision of Chusquea subg. Magnifoliae and C. subg. Platonia in Peru involving 13 taxa. Vegetative and reproductive morphological diagnostic characters were analyzed. Complete illustrations of C. aristata, C. fimbriligulata subsp. peruviana, and C. spectabilis are provided. Chusquea elata, C. fimbriligulata subsp. fimbriligulata, C. mollis, C. nana, and C. spectabilis constitute new reports for Peru. On the basis of morphological comparative studies, keys for the identification of the species of Chusquea subg. Magnifoliae and C. subg. Platonia occurring in Peru were prepared based on vegetative and reproductive characters and are here presented for the first time.

Primer registro de Oligosarcus pintoi campos, 1945 (Characiformes, Characidae) en aguas continentales de Argentina; First record of Oligosarcus pintoi Campos, 1945 (Characiformes, Characidae) in freshwater courses of Argentina Almirón, Adriana; Bogan, Sergio; Cardoso, Yamila Paula; Ciotek, Liliana; Giogis, Pablo; Casciotta, Jorge Rafael Actualmente la biodiversidad íctica conocida del Parque Nacional Iguazú comprende 104 especies, de las cuales dos corresponden a especies de “dientudos” del género Oligosarcus: O. longirostris y O. menezesi. En esta contribución se da a conocer una tercera especie de este género registrada dentro de dicho parque: Oligosarcus pintoi. Este nuevo hallazgo es de relevancia porque, además, constituye el primer reporte de esta especie en Argentina en la cuenca del río Paraná medio.; Currently the known ichthyological biodiversity of the Iguazú National Park is composed by 104 species, two of which correspond to species of “dientudos” of the genus Oligosarcus: O. longirostris and O. menezesi. In this contribution, it is reported within the Park a third species of that genus: Oligosarcus pintoi. This new finding is relevant because it constitutes the first record of the species both in Argentina and in the middle Paraná River basin.

Scale-up of milling in a 100 liter device for processing of TiFeMn alloy for hydrogen storage applications: procedure and characterization Bellosta von Colbe, José; Puszkiel, Julián Atilio; Capurso, Giovanni; Franz, Andreas; Ulrich Benz, Hans; Zoz, Henning; Klassen, Thomas; Dornheim, Martin In this work, the mechanical milling of a FeTiMn alloy for hydrogen storage purposes was performed in an industrial milling device. The TiFe hydride is interesting from the technological standpoint because of the abundance and the low cost of its constituent elements Ti and Fe, as well as its high volumetric hydrogen capacity. However, TiFe is difficult to activate, usually requiring a thermal treatment above 400 °C. A TiFeMn alloy milled for just 10 minutes in a 100 liter industrial milling device showed excellent hydrogen storage properties without any thermal treatment. The as-milled TiFeMn alloy did not need any activation procedure and showed fast kinetic behavior and good cycling stability. Microstructural and morphological characterization of the as-received and as-milled TiFeMn alloys revealed that the material, presents reduced particle and crystallite sizes, even after such short time of milling. The refined microstructure of the as-milled TiFeMn is deemed to account for the improved hydrogen absorption-desorption properties.

Human sperm decondensation in vitro is related to cleavage rate and embryo quality in IVF Galotto, Camila; Cambiasso, Maite Yael; Julianelli, Vanina Laura; Rey Valzacchi, Gaston Javier; Rolando, R. N.; Rodriguez, M. L.; Calvo, L.; Calvo, Juan Carlos; Romanato, Marina Purpose: To investigate whether the ability of human spermatozoa to decondense in vitro in the presence of heparin (Hep) and glutathione (GSH) is related to assisted reproduction (ART) success. Methods: Cross-sectional pilot study involving male partners of 129 infertile couples undergoing ICSI with (45) or without (84) donor oocytes at two infertility clinics in CABA, Argentina, between October 2012 and December 2013. In vitro decondensation kinetics with Hep and GSH and DNA fragmentation (TUNEL) were determined on the same sample used for ICSI. The possible relationship of decondensation parameters (maximum decondensation and decondensation velocity) and TUNEL values with ART success was evaluated. Results: Embryo quality correlated positively with decondensation velocity (D60/D30) (Spearman?s correlation, p < 0.05). According to D60/D30 values, patients were classified as slow decondensers (SlowD) (n = 68) or fast decondensers (FastD) (n = 61). Embryo quality was better in FastD (unpaired t test, p < 0.05). FastD and SlowD were subdivided according to use of donor oocytes. Among SlowD, biochemical and clinical pregnancy rates per transfer were significantly higher in donor (n = 19) vs. in non-donor (n = 31) cycles (Fisher?s exact test, p < 0.05). TUNEL values were not related to embryo quality, but no clinical pregnancies or live births were achieved in TUNEL+ SlowD (n = 7). Conclusion: Decondensation kinetics of human spermatozoa in vitro with Hep and GSH could be related to embryo quality and ART success.

Patrones alimentarios de adultos mayores en una región argentina y su relación con factores socioeconómicos; Dietary patterns of older adults in an Argentine region and their relationship with socioeconomic factors Geri, Milva; Gutierrez, Emiliano Martin; González, Gisela Paula Objetivos Estudiar los patrones de consumo de alimentos en adultos mayores de la provincia de Buenos Aires (Argentina) y relacionarlos con factores socioeconómicos. Métodos A partir de la Encuesta Nacional de Gasto de los Hogares (2012-2013) se efectúa un análisis de componentes principales para encontrar y describir patrones alimentarios adoptados por hogares de la provincia de Buenos Aires habitados por adultos mayores. Mediante pruebas de diferencia de media y proporciones, se establecen relaciones entre el puntaje de los hogares en cada patrón alimentario, el ingreso promedio y la condición de vivir solo o sola. Resultados En función de las cargas factoriales asociadas a cada grupo alimentario, los patrones que, en conjunto, explican el 44,6% de la varianza total son: i) dieta variada tradicional, ii) dieta antiproteica, iii) dieta vegetariana y iv) dieta de hidratos de carbono. Se encuentra que el nivel de ingreso y la condición de vivir solo(a) son factores que podrían estar asociados a la adopción (o no) de la dieta variada tradicional, patrón alimentario recomendado por las guías alimentarias para la población argentina. Discusión La menor frecuencia de hogares habitados por adultos mayores solos y el menor nivel de ingreso promedio de los hogares que presentan un elevado puntaje en la dieta variada tradicional, podría ser utilizada por las autoridades sanitarias a la hora de tomar medidas tendientes a mejorar los patrones alimentarios de los adultos mayores que viven solos y cobran la pensión mínima.; Objectives To study the patterns of food consumption in older adults in the province of Buenos Aires (Argentina) and relate them to socioeconomic factors. Methods Based on the National Household Expenditure Survey (2012-2013), an analysis of main components is carried out to find and describe dietary patterns adopted by households in the province of Buenos Aires habited by older adults. Through tests of mean difference and proportions, relationships between household scores in each food pattern, average income and living alone or alone are established. Results Depending on the factor loads associated with each food group, the patterns that together explain 44.6% of the total variance are: i) traditional varied diet, ii) anti-protein diet, iii) vegetarian diet and iv) carbohydrate diet. It is found that the level of income and the condition of living alone are factors that could be associated with the adoption (or not) of the traditional varied diet, food pattern recommended by the dietary guidelines for the Argentine population. Discussion The lower frequency of households habited by older adults alone and the lower average income level of households that have a high score in the traditional varied diet, could be used by health authorities when taking measures to improve the eating patterns of older adults who live alone and receive the minimum pension.

The paradigm of ground meat as source of STEC in high risk area of HUS from Argentina Broglio, Alicia Susana; Bentancor, Adriana Beatriz Objectives: The aim of this work is to evaluate ground meat as infection source of Shiga toxin-producing Escherichia coli (STEC) to population of Tierra del Fuego, Argentina.Background: Argentina is the country with the highest rate of hemolytic uremic syndrome (HUS). The main agent of HUS is STEC, which produce a food borne disease at a low infective dose (<100 CFU/g). Cattle is a natural reservoir of STEC, and ground meat is a high-risk food since surface contamination is distributed throughout the meat. Tierra del Fuego (TDF) is part of the patagonian region of Argentina, which presents the highest rate of hemolytic uremic syndrome (HUS).Methods: In our study, all of the butcher shops in the island were sampled. Ninety-three samples of ground meat were taken from butcher shops enabled in three TDF communities. Samples were processed in accordance of the algorithm for STEC O157 and non-O157 STEC.Results: A total of 2.15% of the samples of ground meat from the retail outlets of TDF were suspected of O157: H7 non-STEC. STEC were absent in the sampling round.Conclusion: According to no one cases of HUS from TDF was reported at the National Vigilance System during our sampling period, we could not discard ground meat as the main source of STEC infection which cause HUS. Ground meat as infection source of STEC could not be discarded in TDF according to no report of HUS case was reported at National Vigilance System during to our sampling dates. Meat contamination could have a timely presentation coinciding with the cases of HUS. Also, other sources of infection could be involved locally. Prevention is a fundamental tool to use with HUS, it is necessary to implement various measures, including good manufacturing and hygiene practices, consumption and use of safe water at industry and home steps.

The recent experience of the Argentine competition authority Viecens, María Fernanda When the new government was elected at the end of 2015, the new members of the Argentine Competition Commission (Comisión Nacional de Defensa de la Competencia, CNDC) were appointed. At that moment, the CNDC was a disregarded and discredited agency, with almost 500 pending antitrust and merger cases and an average review timeframe of 30 months. Competition compliance was not an issue in the agenda of firms operating in Argentina (national firms in particular), which were more concerned about inefficiencies and delays in the performance of the agency, than about fines and remedies. The new administration announced its intention to activate competition policy and to strengthen the powers of the Argentine Competition Commission...

Empresas recuperadas y Estado local: El caso de Villa María (Provincia de Córdoba-Argentina) Barrera Calderon, Juan Emanuel Desde fines de la década del noventa, frente a la situación de quiebra, bajas en la productividad, adeudamiento de salarios, deudas fiscales y abandono por parte de las/os dueños, cobra visibilidad el fenómeno de recuperación de empresas. Lo que ha implicado la puesta en marcha de procesos de autogestión por parte de las/os trabajadores como alternativa a la desocupación. Luego de 2001 y hasta por lo menos 2015, la Economía Social (ES) se posicionó como un ámbito clave de las políticas públicas aplicadas por el gobierno nacional en su condición de población objetivo y como componente para la generación de empleo y la inclusión social. En ese marco, y en el interior de la provincia de Córdoba, República Argentina, la ciudad de Villa María contó con diversas experiencias de cooperativización y que, como dato diagnóstico, en principio parecían procesos similares a los que se daban en el resto del país. En este artículo intentaremos abordar la reconfiguración del Estado local en la cooperativización de tres empresas recuperadas prestadoras de servicios públicos en la ciudad de Villa María: la Cooperativa “Ctalamochita” Ltda., la Cooperativa “El Sol” Ltda. y la Cooperativa “7 de febrero” Ltda.; Since the end of the nineties, in the face of bankruptcy, low productivity, owed wages, tax debts and abandonment by the owners, visibility of the phenomenon of recovery of companies. What has involved the implementation of selfmanagement processes by workers as an alternative to unemployment. After 2001 until at least 2015, the Social Economy was positioned as a key area of public policies applied by the national government in its capacity as an objective population and as a component for generating employment and social inclusion. In this framework, and in the interior of the province of Córdoba, the city of Villa María had various experiences of cooperativization and, as a diagnostic data, in principle they seemed similar to those that occurred in the rest of the country. Thus, in this article we will try to address the reconfiguration of the local state in the cooperativization of three companies recovering public services in the city of Villa María: Cooperativa "Ctalamochita" Ltda., Cooperativa "El Sol" Ltda. Cooperativa "7 de febrero" Ltda.

Alcances y desafíos de la cooperación académica internacional: El caso del proyecto VISIR+; Achievements and challenges of international academic cooperation: The case of VISIR+ Project Pozzo, María Isabel Rita Este artículo presenta los resultados de una investigación sobre los logros y desafíos de la cooperación académica internacional para contribuir a la formación profesional en educación superior. Para lograr este objetivo, describe aspectos relevantes inherentes a la modalidad a través de un estudio de caso centrado en un proyecto multilateral; específicamente, el proyecto VISIR + que involucra carreras de ingeniería de seis países latinoamericanos y europeos. Metodológicamente, se basa en la observación participante en diferentes instancias de su implementación (reuniones en persona e intercambios virtuales). Los resultados permiten sistematizar sus logros y desafíos, con el fin de promover la cooperación académica internacional como estrategia fundamental para el mejoramiento de la educación superior.; This article presents the results of a research on the achievements and challenges of international academic cooperation to contribute to professional training in higher education. To achieve this goal, it describes relevant aspects inherent to the modality through a case study focused in a multilateral Project; specifically, the VISIR + Project that involves engineering careers from six Latin American and European countries. Methodologically, it is based on participant observation in different instances of its implementation (in person meetings and virtual interchanges). The results allow to systematize its achievements and challenges, in order to promote international academic cooperation as a fundamental strategy for the improvement of higher education.

Indigenous arbuscular mycorrhiza and Trichoderma from systems with soybean predominance can improve tomato growth Commatteo, Jacqueline Giselle; Consolo, Verónica Fabiana; Barbieri, Pablo Andres; Covacevich, Fernanda In the last decades, there has been a tendency towards sustainable agriculture. Following this trend, edaphic fungi as Trichoderma and arbuscular mycorrhizal fungi (AMF) could increase plant growth contributing to diminish agricultural chemical supply. However, little information exists in current research regarding the possible effects of alternative practices to soybean monoculture systems on fungal groups that could contribute to plant health and/or productivity. Thus, our objective was to assess changes in the abundance and diversity of indigenous AMF and Trichoderma from a long-term field experiment located in the Argentinean Pampas, in order to test the effect of alternative practices to soybean monoculture. The fungal ability to promote the growth of crops, such us tomato plant was also tested. Soil samples were collected from a soybean monoculture system (Sb), a system including cover crop (Avena sativa) followed by soybean (CC/Sb) and a system including rotations (rot) of Soybean-Maize-Wheat crops CC/Sb-rot, M-rot and W-rot, respectively. Highest AMF and Trichoderma abundance was found at W-rot and M-rot systems, and highest AMF diversity was found at W-rot and CC systems. Furthermore, highest mycorrhizal colonization was found at CC/Sb and W-rot systems. Inoculated plants with single AMF consortium or with Trichoderma strains showed significant increases in comparison with the control. Dual inoculation increased tomato plant growth as compared to the control, and evidence of synergism was found by increases in shoot and root growth. Our results show that dual inoculation with indigenous AMF and Trichoderma from alternative crop systems to soybean monoculture could play an important role in tomato plant growth. This information could be useful to decrease production costs and environmental impacts.

Parasites in a Holocene Environment: Their Presence on the Floor of Caves Amalfitano, Giorgina; Petrigh, Romina Sandra; Fugassa, Martín Horacio Exploratory examinations were performed in sediments of archaeological levels from Cerro Casa de Piedra, cave 7 (CCP7). The aim of the present study was to identify parasitic remains present in the floor where human occupation has been reported. Parasite remains of Eimeria macusaniensis, molineids and two capillariids nematodes were identified. A single oocyst of Eimeria ivitaensis was found, resulting in the first report from Patagonia. Parasites found in this work were previously reported in camelid coprolites. Parasitological findings showed camelids presence into the cave and a high contamination of domestic area. These findings reinforce the hypothesis about the role of caves in parasites circulation among mammals community of Patagonia.

Non-pollen palynomorphs notes: 3. Phototrophic loricate euglenoids in paleoecology and the effect of acetolysis on Trachelomonas loricae Shumilovskikh, Lyudmila S.; Schlütz, Frank; Lorenz, Maike; Tomaselli, María Belén Algal palynomorphs are useful indicators of freshwater environments in the past and present, allowing reconstruction of such environmental characteristics as former pH, trophic stage, temperature and salinity. However, the using of algal palynomorphs in paleoecology is restricted by their resistance to natural degradation and acetolysis treatment. In this study, we evaluate the usefulness of the loricate euglenophyte genera Trachelomonas and Strombomonas as paleoecological indicators. In order to evaluate their resistance to degradation, loricae morphology of four Trachelomonas species from the Culture Collection of Algae at Göttingen University (SAG) were studied with and without acetolysis treatment. The experiment demonstrates a strong dissolution under acetolysis of the three species T. hispida, T. lefévrei, T. zorensis and a reduction in the loricae length by T. similis. In the Holocene records, Trachelomonas can be found in non-acetolyzed samples, occurring together with other eutrophication indicators such as cyanobacteria and ciliate Codonella cratera. A review of recent algological literature supports Trachelomonas being a good indicator of organic pollution.

Inventar el imposible porvenir: estética y política; Inventing the impossible to come: esthetics and politics Chun, Sebastián ¿Qué es la invención? ¿Cuál es su relación con la tradición que viene a interrumpir? Estas preguntas guiarán el recorrido aquí propuesto, en el cual una concepción clásica de la invención, que acentúa su carácter novedoso y disruptivo, será puesta en cuestión. La reflexión sobre la vanguardia en Adorno y Horkheimer, la búsqueda de un poder destituyente por parte de Agamben y la concepción de la escritura desplegada por Borges nos servirán de preámbulos al análisis que realiza Derrida de la invención imposible. Este itinerario nos permitirá articular estética y política, en la búsqueda de un pensamiento emancipatorio que anuncie la invención de otro modo de lo político.; What is invention? What´s its relationship with the tradition which invention comes to interrupt? This questions will guide the itinerary we propose. Through its developement, the classic understanding of the invention, that points out its original and disruptive character, will be questioned. The consideration of the avant-garde of Adorno and Horkheimer, the seek on a destituent power of Agamben and Borges´ conception of writing will be the preamble to the analysis of the impossible invention made by Derrida. In this tour esthetics and politics may be articulated, in order to find an emancipatory thought which announces otherwise than politics.

Internet memes: una relación visual contemporánea; Internet memes: a contemporary visual relation Winckler, Greta El siguiente trabajo se propone pensar un tipo de imagen contemporánea: el meme. Como parte de nuestra economía visual actual, se da cuenta de su impacto y genealogía que se presenta no sólo como hilo histórico sino como necesaria para entender por qué los memes son tan eficaces y populares. Se propone pensar en particular a los memes políticos, anclados en la tradición de la sátira, planteando a estas imágenes “pobres” no como una emergencia totalmente nueva sino más bien desde una continuidad con artefactos visuales que las precedieron.; This article aims to think over a particular type of contemporary image: the Internet-meme. As a part of our visual economy, it is intended to expose its impact as well as its genealogy to understand why memes are so popular and efficient nowadays. This piece focuses on political memes, as belonging to a satirical tradition of images, implying that these so-called “poor” images are not a totally new phenomenon but, on the contrary, a continuity with preceding visual artifacts.