Late Jurassic Cassiduloids (Echinodermata, Echinoidea) from West-Central Argentina: Taxonomic and Paleogeographic Implications Caccia, Patricio Esteban; Cataldo, Cecilia Soledad; Aguirre Urreta, María Beatriz Los casiduloideos se encuentran relativamente bien representados en el registro fósil desde su aparición en el Jurásico Temprano, especialmente en Europa y norte de África. El grupo muestra un aumento en diversidad y abundancia hacia finales del Jurásico. En Argentina, se encuentran representados a partir del Jurásico Medio. En el presente trabajo se describen casiduloideos del Tithoniano de la Formación Picún Leufú (Cuenca Neuquina, Argentina) determinados como Mepygurus? andinus nueva comb. en función de sus burreletes poco desarrollados, filodes rectos y continuos hasta los márgenes, y de su ámbito subpentagonal. La especie fue originalmente descripta de la Formación Baños del Flaco, en la vertiente chilena de la Cuenca Neuquina-Aconcagüina. Este registro extiende el rango estratigráfico del género por lo menos hasta el Tithoniano y proporciona evidencia adicional para la interpretación de la continuidad espacial de las plataformas de aguas someras durante el Jurásico Tardío de la región andina.; Cassiduloids are relatively well-represented in the fossil record, especially in Europe and Northern Africa, ever since their first occurrence in the Lower Jurassic. The group shows an increase in diversity and abundance at the end of the Jurassic. In Argentina, cassiduloids are represented from the Middle Jurassic upwards. This paper describes a Tithonian cassiduloid from the Picún Leufú Formation (Neuquén Basin, Argentina) identified as Mepygurus? andinus new comb. according to the poorly developed bourrelets, straight phyllodes that are continuous up to the margin, and a subpentagonal outline. The species was originally described from the Baños del Flaco Formation on the Chilean slope of the Neuquén-Aconcagua Basin. This record extends the stratigraphical range of the genus to at least the Tithonian and provides further evidence to the interpretation of the spatial continuity of shallow-water platforms during the Late Jurassic in the Andean region.

Chile, año cero: la imagen-esperanza en el cine de la Unidad Popular; Chile, year zero: the image-hope in the cnema of the popular unit Taccetta, Natalia Roberta Desde una perspectiva teórica cercana al giro afectivo, estas páginas se proponen reflexionar sobre la construcción de la esperanza en parte del cine de la Unidad Popular chilena durante los primeros meses del gobierno de Salvador Allende. No se revisan en profundidad filmes sobre los que se ha dicho todo, sino que se rastrea en algunos lo que se da en llamar la imagen-esperanza. Para ello, se eligen tres filmes cuya única nota común es corresponderse de modos diversos con una suerte de «año cero»: El primer año de Patricio Guzmán (1972), Voto + fusil de Helvio Soto (1971), y Palomita blanca de Raúl Ruiz, terminada en 1973 antes del golpe de Estado, y reeditada y estrenada en 1992. En los tres, es posible tematizar una esperanza que parece plantear más interrogantes que opciones tranquilizadoras aun cuando, como decía Guzmán en el diario de filmación de El primer año, «Chile era una fiesta».; From a theoretical perspective close to the affective turn, these pages propose to reflect on the construction of hope in part of the Chilean Popular Unity cinema during the first months of Salvador Allende’s government. We do not review in depth films about which everything has been said, but we study what can be called the image-hope. We chose three films whose only common note is that they correspond in various ways to a kind of «zero year»: El primer año by Patricio Guzmán (1972), Voto + fusil by Helvio Soto (1971) and Palomita blanca by Raúl Ruiz, finished in 1973 before the coup d’état and released in 1992. In all three, it is possible to thematize a hope that seems to raise more questions than reassuring options even when, as Guzmán said in the filming diary of El primer año, «Chile was a party».

Una mirada a París desde la alcantarilla: Los “cuartos propios” de Alejandra Pizarnik; A look at Paris from the sewer: Alejandra Pizarnik's "room of one's own" Barbero, Ludmila Soledad En la obra de Alejandra Pizarnik los espacios tienen una fuerte carnadura corporal, y, a su vez, las representaciones del cuerpo se construyen con referencias espaciales. Nos detendremos en ciertas representaciones espaciales, y espacio-corporales, en los Diarios (2013) del período parisino (1960-1964) para ver cómo aparecen allí la ciudad y el “cuarto propio”. Se retomarán entradas de años anteriores para el análisis del espacio, y referencias a la correspondencia, particularmente las Cartas Alejandra Pizarnik/ León Ostrov (2012). Se partirá de la perspectiva de que espacio y cuerpo son elementos indisociables –además de elementos clave– en la escritura de Pizarnik.; In Alejandra Pizarnik’s work, spaces have a strong bodily presence, and, in turn, representations of the body are constructed with spatial references. We will dwell on certain spatial and spatio-corporal representations in the Diarios (2013) of the Parisian period (1960-1964) to see how the city and the “room of her own” appear there. Entries from previous years will be taken up for the analysis of space, and references to correspondence, particularly the Cartas Alejandra Pizarnik/ Leon Ostrov (2012). We will take upon the perspective that space and body are inseparable –as well as key elements– in Pizarnik's writing.; Dans l’œuvre d’Alejandra Pizarnik, les espaces ont une forte présence corporelle et, en retour, les représentations du corps sont construites à l’aide de références spatiales. Nous nous concentrerons sur certaines représentations spatiales et spatio-corporelles dans les Diarios (2013) de la période parisienne (1960-1964) afin de voir comment la ville et la “chambre à soi” y sont représentées. Les entrées des années précédentes seront reprises pour l’analyse de l’espace, et les références à la correspondance, notamment les Cartas Alejandra Pizarnik/León Ostrov (2012). Nous partirons de l’idée que l’espace et le corps sont des éléments inséparables –ainsi que des pièces maîtresses– dans l’écriture de Pizarnik.

Gravitational study of escape routes and residence regions of Ceres and Vesta fragments Zain, Patricio Salvador; Di Sisto, Romina Paula Aims. Ceres and Vesta are the two largest bodies in the main asteroid belt (MB) and have been extensively studied, particularly sincethe DAWN mission. Vesta is known to have an associated asteroid family, while the existence of a Ceres family is uncertain. Thisstudy investigates the fate of multi-kilometre fragments ejected from Ceres and Vesta due to impacts over a timescale of severalhundred million years.Methods. We performed purely gravitational N-body simulations to investigate the dynamical evolution of multi-kilometre-sizedfragments ejected from Ceres and Vesta. We tracked the trajectories of these fragments and identified their residence regions withinthe MB. We analysed the escape routes and end states of the fragments that manage to leave the MB, including the delivery to thenear-Earth asteroids (NEAs). We also estimated the number of collisions with Earth that could be attributed to large fragments ejectedfrom Ceres and Vesta.Results. Our simulations show that the Ceres fragments are dispersed over a larger region in the MB compared to Vesta fragments dueto their higher ejection velocities. We identified the escape routes of the fragments that leave the MB, which for the Ceres fragmentsare the 5:2 and 8:3 mean-motion resonances (MMR), and for the Vesta fragments are the 3:1 MMR and ν6 secular resonance, wherethey can be delivered to the NEA region. We also find that the Pristine region, located between the 5:2 and 7:3 MMR, is the mostlikely place to find any surviving member of a Ceres family. There were no collisions of large Ceres or Vesta fragments with Earthover the age of the Solar System, suggesting that, under the model considered here, the howardite–eucrite–diogenite (HED) meteoritesoriginate from smaller NEAs from Vesta.

Demographic collapse threatens the long-term persistence of Andean condors in the northern Andes Padro, Julian; Vargas, Félix Hernán; Lambertucci, Sergio Agustin; Perrig, Paula Leticia; Pauli, Jonathan Nicholas; Ortega, Andrés; Kohn, Sebastián; Navarrete, Jorge; Heredia, Shady; Narváez, Fabricio; Andrade Brito, Diego; Chaves, Jaime A. Determining the conservation status of long-lived and highly mobile species is particularly challenging due to their long generational time and the spatio-temporal scale at which they interact with their landscape. Vultures are not only extremely vagile and long-lived but are also some of the most threatened species globally. However, the genetic status and connectivity patterns of most vulture species of the southern hemisphere remain poorly understood. Herein, we studied the patterns of neutral genetic variability in both the captive and remnant wild populations of Andean condors (Vultur gryphus) from the equatorial Andes and assessed their movement dynamic to infer current connectivity, as well as identify conservation corridors in one of the most critical areas for the conservation of the species. We found that the demographic collapse of condors in the region has severely affected their effective population size, which might lead to an extinction vortex in the near future. However, our results indicated that the captive population still harbors substantial genetic variation that could be harnessed to strengthen wild populations. Although our landscape resistance models revealed that the northern Andean corridor provides a continuum of suitable habitat for condors, our connectivity assessment identified important spatial disruptions, likely driven by anthropogenic processes. We discuss the implications of our findings to the conservation plan of Andean condors, while highlighting the importance of integrating multiple data sources to identify extinction risks in other species exhibiting high dispersal capabilities and long generational times.

El peronismo de la sexta sección electoral bonaerense en tiempos de reorganización (1982-1983): actores y prácticas políticas; The Peronism of the sixth electoral section of Buenos Aires in times of reorganization (1982-1983): actors and political practices Marcilese, José Bernardo El presente artículo procura analizar la dinámica interna del peronismo en la etapa de reorganización interna que precede a las elecciones generales de octubre de 1983. Para ello, el trabajo explora las prácticas políticas y las estrategias que los ordenaron las acciones que los peronistas llevaron adelante en el escenario de la sexta seccional electoral de la provincia de Buenos Aires.; This article seeks to analyze the internal dynamics of Peronism in the stage of internal reorganization that precedes the general elections of October 1983. To do so, the work explores the political practices and strategies that ordered the actions that the Peronists carried out in the scene of the sixth electoral section of the province of Buenos Aires.

El libro biográfico de Giuseppe Tornetti sobre el mártir jesuita Antonio Ripari (1711): Análisis crítico y edición en castellano; The biographical book by Giuseppe Tornetti on the Jesuit martyr Antonio Ripari (1711): Critical analysis and edition in Spanish Page, Carlos Alberto Si bien el libro de Tornetti fue citado por algunos autores, éstos pareciera que no lo consultaron porque hubieran mencionado valiosos datos allí consignados. Es nuestra in-tención dar a conocer esta obra que adjuntamos, traducida al castellano, publicada en Italia en 1711. Previamente analizamos los motivos y el contexto en que fue escrita por un longevo párroco de iglesia, conciudadano del biografiado, en tiempos difíciles para la Italia del siglo XVIII. De allí que analizamos brevemente el desarrollo del género biográfico dentro de los jesuitas del Paraguay, como a su vez una biobibliografía del Padre Antonio Ripari, para luego abordar los aspectos centrales, es decir el autor, la dedicatoria, el impresor y sobre todo el contenido del texto. Un protagonista jesuita que se convirtió en paradigma de un tiempo y ejemplo para jóvenes, entregando la vida por la profunda convicción de su fe cristiana.; Although Tornetti's book was quoted by some authors, it seems that they did not consult it because they would have mentioned some of the information contained in it. It is our intention to make known this work that we enclose, translated into Spanish, published in Italy in 1711. Beforehand, we have analyzed the motives and the context in which it was written by a long-lived parish priest, a fellow citizen of the biographer, in difficult times for Italy in the 18th century. From there, we briefly analyze the development of the biographical genre among the Jesuits of Paraguay, as well as a biobibliography of Father Antonio Ripari, and then address the central aspects, that is the author, the dedication, the printer and above all the content of the text. A Jesuit protagonist who became a paradigm of a time and an example for young people, giving his life for the profound conviction of his Christian faith.

The VISCACHA survey. VIII. Chemical evolution history of the Small Magellanic Cloud west halo clusters Saroon, S.; Dias, B.; Tsujimoto, T.; Parisi, Maria Celeste; Maia, F.; Kerber, L.; Bekki, K.; Minniti, D.; Oliveira, R. A. P.; Westera, P.; Katime Santrich, O. J.; Bica, E.; Sanmartim, D.; Correa Quint, B.; Fraga, L. The chemical evolution history of the Small Magellanic Cloud (SMC) has been a matter of debate for decades. The challenges in understanding the SMC chemical evolution are related to a very slow star formation rate (SFR) combined with bursts triggered by the multiple interactions between the SMC and the Large Magellanic Cloud, a significant (∼0.5 dex) metallicity dispersion for the SMC cluster population younger than about 7.5 Gyr, and multiple chemical evolution models tracing very different paths through the observed age–metallicity relation of the SMC. There is no doubt that these processes were complex. Therefore, a step-by-step strategy is required in order to better understand the SMC chemical evolution. We adopted an existing framework to split the SMC intoregions on the sky, and we focus on the west halo in this work, which contains the oldest and most metal-poor stellar populations and is moving away from the SMC, that is, in an opposite motion with respect to the Magellanic Bridge. We present a sample containing ∼60% of all west halo clusters to represent the region well, and we identify a clear age–metallicity relation with a tight dispersionthat exhibits a 0.5 dex metallicity dip about 6 Gyr ago. We ran chemical evolution models and discuss possible scenarios to explain this metallicity dip, the most likely being a major merger accelerating the SFR after the event. This merger should be combined with inefficient internal gas mixing within the SMC and different SFRs in different SMC regions because the same metallicity dip is not seen in the AMR of the SMC combining clusters from all regions. We try to explain the scenario to better understand the SMC chemo-dynamical history.

Orbits in static magnetically and dyonically charged Einstein-Euler-Heisenberg black hole spacetimes Magos Cortes, Daniela; Bretón, Nora; Macías, Alfredo In the framework of the nonlinear Euler-Heisenberg electrodynamics coupled to general relativity, we consider static Einstein-Euler-Heisenberg magnetically and dyonically charged black hole spacetimes. These black holes are characterized, as usual, by mass M, magnetic charge Qm, electric charge Q and the Euler-Heisenberg nonlinear parameter. We find all possible equatorial trajectories for neutral and charged test particles. We analyze the light rings by using the Plebański pseudometric. The shape of the shadow of these black holes is presented, discussed, and compared with the one of the corresponding ReissnerNordström linear cases.

Effects of Heparan sulfate acetyl-CoA: Alpha-glucosaminide N-acetyltransferase (HGSNAT) inactivation on the structure and function of epithelial and immune cells of the testis and epididymis and sperm parameters in adult mice Carvelli, Flavia Lorena; Hermo, Louis; O’Flaherty, Cristian; Oko, Richard; Pshezhetsky, Alexey V.; Morales, Carlos R. Heparan sulfate (HS), an abundant component of the apical cell surface and basement membrane, belongs to the glycosaminoglycan family of carbohydrates covalently linked to proteins called heparan sulfate proteoglycans. After endocytosis, HS is degraded in the lysosome by several enzymes, including heparan-alpha-glucosaminide N-acetyltransferase (HGSNAT), and in its absence causes Mucopolysaccharidosis III type C (Sanfilippo type C). Since endocytosis occurs in epithelial cells of the testis and epididymis, we examined the morphological effects of Hgsnat inactivation in these organs. In the testis, Hgsnat knockout (Hgsnat-Geo) mice revealed statistically significant decrease in tubule and epithelial profile area of seminiferous tubules. Electron microscopy (EM) analysis revealed cross-sectional tubule profiles with normal and moderately to severely altered appearances. Abnormalities in Sertoli cells and blood-testis barrier and the absence of germ cells in some tubules were noted along with altered morphology of sperm, sperm motility parameters and a reduction in fertilization rates in vitro. Along with quantitatively increased epithelial and tubular profile areas in the epididymis, EM demonstrated significant accumulations of electrolucent lysosomes in the caput-cauda regions that were reactive for cathepsin D and prosaposin antibodies. Lysosomes with similar storage materials were also found in basal, clear and myoid cells. In the mid/basal region of the epithelium of caput-cauda regions of KO mice, large vacuolated cells, unreactive for cytokeratin 5, a basal cell marker, were identified morphologically as epididymal mononuclear phagocytes (eMPs). The cytoplasm of the eMPs was occupied by a gigantic lysosome suggesting an active role of these cells in removing debris from the epithelium. Some eMPs were found in proximity to T-lymphocytes, a feature of dendritic cells. Taken together, our results reveal that upon Hgsnat inactivation, morphological alterations occur to the testis affecting sperm morphology and motility parameters and abnormal lysosomes in epididymal epithelial cells, indicative of a lysosomal storage disease.

Reflexiones contemporáneas sobre un ‘revisionismo histórico de izquierda’ Acha, José Omar Entiendo que si un revisionismo histórico de izquierdas tiene sentido no le es suficiente, como debería ocurrir con cualquier proyecto de revisión histórica, ser tan buena como cualquier otra historiografía. También debe situarse en la perspectiva de aportar a la reconstrucción renovada, no nostálgica, dela política de izquierdas. Me parece que el proyecto continúa pendiente, y la invitación a desarrollarlo,abierta. Esencialmente porque la política de izquierdas sin perspectivas que conjuguen reflexiones demediano y largo plazo se extravía en la inmediatez de la institucionalización cotidiana, en luchas necesarias pero sin horizontes más comprensivos. La política de izquierdas requiere recuperar la posibilidad de pensar históricamente y allí la práctica historiográfica revisionista en el sentido aquí postulado tiene una contribución por realizar.

Broad-Spectrum Antiviral Effect of Cannabidiol Against Enveloped and Nonenveloped Viruses Marquez, Agostina Belén; Vicente, Josefina; Castro, Eliana; Vota, Daiana Marina; Rodríguez Varela, Maria Soledad; Lanza Castronuovo, Priscila Ailin; Fuentes, Giselle Magali; Parise, Alejandro Ruben; Romorini, Leonardo; Alvarez, Diego Ezequiel; Bueno, Carlos Alberto; Ramirez, Cristina Lujan; Alaimo, Agustina; Garcia, Cybele Introduction: Cannabidiol (CBD), the main non-psychoactive cannabinoid of the Cannabis sativa plant, is a powerful antioxidant compound that in recent years has increased interest due to causes effects in a wide range of biological functions. Zika virus (ZIKV) is a virus transmitted mainly by the Aedes aegypti mosquitoes, which causes neurological diseases, such as microcephaly and Guillain-Barre syndrome. Although the frequency of viral outbreaks has increased recently, no vaccinations or particular chemotherapeutic treatments are available for ZIKV infection. Objectives: The major aim of this study was to explore the in vitro antiviral activity of CBD against ZIKV, expanding also to other dissimilar viruses. Materials and Methods: Cell cultures were infected with enveloped and nonenveloped viruses and treated with non-cytotoxic concentrations of CBD and then, viral titers were determined. Additionally, the mechanism of action of the compound during ZIKV in vitro infections was studied. To study the possible immunomodulatory role of CBD, infected and uninfected Huh-7 cells were exposed to 10 μM CBD during 48 h and levels of interleukins 6 and 8 and interferon-beta (IFN-β) expression levels were measured. On the other hand, the effect of CBD on cellular membranes was studied. For this, an immunofluorescence assay was performed, in which cell membranes were labeled with wheat germ agglutinin. Finally, intracellular cholesterol levels were measured. Results: CBD exhibited a potent antiviral activity against all the tested viruses in different cell lines with half maximal effective concentration values (CE50) ranging from 0.87 to 8.55 μM. Regarding the immunomodulatory effect of CBD during ZIKV in vitro infections, CBD-treated cells exhibited significantly IFN-β increased levels, meanwhile, interleukins 6 and 8 were not induced. Furthermore, it was determined that CBD affects cellular membranes due to the higher fluorescence intensity that was observed in CBD-treated cells and lowers intracellular cholesterol levels, thus affecting the multiplication of ZIKV and other viruses. Conclusions: It was demonstrated that CBD inhibits structurally dissimilar viruses, suggesting that this phytochemical has broad-spectrum antiviral effect, representing a valuable alternative in emergency situations during viral outbreaks, like the one caused by severe acute respiratory syndrome coronavirus 2 in 2020.

Comparison of mortality in patients on chemotherapy or immunotherapy during and before the COVID-19 pandemic: Multicenter matched cohort study in Argentina; Comparación de la mortalidad en pacientes en quimioterapia o inmunoterapia durante y antes de la pandemia de COVID-19: Estudio multicéntrico de cohortes emparejadas Itkin, Boris; Straminsky, Samanta; Cáceres, Hernán; Onassis, Mariana; García, Agustín Emilio; Avanzi, Laura; Kaminszczik, Lucia; Sejas, Richard Serna; Rapaccioli, Mara; Billordo, Gustavo; Lavaccara, Damián; Lanzavecchia, Julián; Gibbons, Luz; Settecase, Eugenia; Bardach, Ariel Esteban Objetivos. Comparar la mortalidad por todas las causas de pacientes oncológicos no vacunados que recibieron quimioterapia o inmunoterapia durante la pandemia, con aquellos tratados antes de la pandemia. Materiales y métodos. Realizamos un estudio de cohortes en cuatro hospitales terciarios en Argentina. Pacientes ambulatorios con una neoplasia sólida de cualquier estadio en tratamiento citotóxico o inmune intravenoso fueron elegibles. La cohorte pandémica se enroló durante la fase inicial del brote y se comparó con una cohorte de un período anterior a la pandemia utilizando emparejamiento por puntuación de propensión (PSM, por sus siglas en inglés). Los sujetos se emparejaron por edad, sexo, seguro de salud, factores de riesgo para complicaciones graves por COVID-19, estado funcional, tipo de cáncer y tratamiento, línea de tratamiento e índice de masa corporal. La mortalidad por todas las causas se estimó en ambas cohortes después de seis meses de seguimiento. Resultados. 169 pacientes fueron reclutados entre abril y agosto de 2020 para la cohorte pandémica y 377 para la cohorte prepandémica en el mismo período de 2019, 168 pacientes fueron emparejados. Luego de la PSM, la mortalidad por todas las causas fue del 17,9% en la cohorte pandémica y del 18,5% en la cohorte prepandémica, Riesgo Relativo: 0,97 (intervalo de confianza al 95 %: 0,61-1,52; p=0,888). En la cohorte pandémica, 30/168 pacientes fallecieron, ninguno por infección por COVID-19. Conclusiones. No hemos observado un aumento de mortalidad en pacientes ambulatorios no vacunados en tratamiento oncológico endovenoso activo durante la pandemia por COVID-19.; Objectives. To compare all-cause mortality of unvaccinated oncology patients who received chemotherapy or immunotherapy during the pandemic with those treated before the pandemic. Materials and methods. We conducted a cohort study in four tertiary hospitals in Argentina. Outpatients with a solid neoplasm of any stage under-going cytotoxic or intravenous immunotherapy were eligible. The pandemic cohort was enrolled during the initial phase of the outbreak and compared with a pre-pandemic cohort using propensity score matching (PSM). Subjects were matched for age, sex, health insurance, risk factors for severe COVID-19 complications, performance status, cancer type and treatment, line of treatment, and body mass index. All-cause mortality was estimated for both cohorts after 6 months of follow-up. Results. A total of 169 patients were recruited between April and August 2020 for the pandemic cohort and 377 for the pre-pandemic cohort in the same months of 2019; 168 patients were matched. After PSM, all-cause mortality was 17.9% in the pandemic cohort and 18.5% in the pre-pandemic cohort; the Relative Risk was 0.97 (95 % confidence interval: 0.61-1.52; p=0.888). In the pandemic cohort, 30/168 patients died, but none from COVID-19. Conclusions. Our findings show that the mortality rate of unvaccinated ambulatory patients on active intravenous oncology treatment during the COVID-19 pandemic did not increase.

Thermonuclear type-I X-ray bursts and burst oscillations from the eclipsing AMXP swift J1749.4-2807 Albayati, A. C.; Bult, P.; Altamirano, D.; Chenevez, J.; Guillot, S.; Güver, T.; Jaisawal, G. K.; Malacaria, C.; Mancuso, Giulio Cesare; Marino, A.; Ng, M.; Sanna, A.; Strohmayer, T. E. Swift J1749.4-2807 is the only known eclipsing accreting millisecond X-ray pulsar. In this paper, we report on seven thermonuclear (Type-I) X-ray bursts observed by NICER during its 2021 outburst. The first six bursts show slow rises and long decays, indicative of mixed H/He fuel, whereas the last burst shows fast rise and decay, suggesting He-rich fuel. Time-resolved spectroscopy of the bursts revealed typical phenomenology (i.e. an increase in blackbody temperature during the burst rise, and steady decrease in the decay), however, they required a variable NH. We found that the values of NH during the bursts were roughly double those found in the fits of the persistent emission prior to each burst. We interpret this change in absorption as evidence of burst-disc interaction, which we observe due to the high inclination of the system. We searched for burst oscillations during each burst and detected a signal in the first burst at the known spin frequency of the neutron star (517.92 Hz). This is the first time burst oscillations have been detected from Swift J1749.4-2807. We further find that each X-ray burst occurs on top of an elevated persistent count rate. We performed time-resolved spectroscopy on the combined data of the bursts with sufficient statistics (i.e. the clearest examples of this phenomenon) and found that the blackbody parameters evolve to hotter temperatures closer to the onset of the bursts. We interpret this as a consequence of an unusual marginally stable burning process similar to that seen through mHz QPOs.

Acumulación por desposesión en Argentina: la fiebre del litio y el acaparamiento neocolonial de tierras y recursos naturales; Acumulação por desapropriação na Argentina: a febre do lítio e a grilagem neocolonial de terras e recursos naturais; Acummulation by dispossession in Argentina: lithium fever and the neocolonial grabbing of lands and natural resources Gómez Lende, Sebastián La privatización y apropiación imperial de tierras y recursos son dinámicas expropiatorias intrínsecas al proceso de acumulación por desposesión habitualmente llevado a cabo por la industria minera. El boom del litio no constituye una excepción a la regla. Sobre la base de bibliografía académica, fuentes oficiales, información periodística, informes corporativos y portales especializados, este artículo analiza el proceso de acaparamiento de tierras, salares y recursos minerales e hídricos desencadenado por la fiebre del litio en Argentina, cuarto productor y exportador y segundo reservorio más importante del mundo de este metal. Los resultados muestran la privatización de la tríada mineral-tierra-agua y el acaparamiento de una superficie que ronda las 1,8 millones de hectáreas, así como de reservas valuadas en casi 86 millones de toneladas de carbonato de litio equivalente. Asimismo, revelan la puja geopolítica por el control del recurso doméstico y una participación del capital argentino en el proceso sustancialmente mayor a la inicialmente considerada.; A privatização e a apropriação imperial de terras e recursos são dinâmicas expropriatórias intrínsecas ao processo de acumulação por espoliação usualmente realizado pela indústria mineradora. O boom do lítio não é exceção à regra. Com base em bibliografia acadêmica, fontes oficiais, informações jornalísticas, relatórios corporativos e portais especializados, este artigo analisa o processo de grilagem de terras, salinas e recursos minerais e hídricos desencadeado pela febre do lítio na Argentina, quarto maior produtor e exportador e segundo maior do mundo maior reservatório desse metal. Os resultados mostram a privatização da tríade mineral-terra-água e o entesouramento de uma área de cerca de 1,8 milhão de hectares e reservas avaliadas em quase 86 milhões de toneladas de carbonato de lítio equivalente. Da mesma forma, revelam a luta geopolítica pelo controle do recurso doméstico e uma participação do capital argentino no processo substancialmente maior do que inicialmente considerado.; Both privatization and imperial appropriation of lands and natural resources are expropiatory dynamics intrinsic to the accumulation by dispossession’s process habitually carried out by the mining industry. Lithium boom is not an exception to that rule. On the basis of scholar literature, official sources, journalistic information, corporative reports, and specialized web pages, this paper analyzes the process of grabbing of lands, salt basins and mineral and hydric resources unchained by the lithium fever in Argentina, a country that is both the fourth lithium producer and exporter and the second reservoir of such metal in the world. The findings show the privatization of the mineral-land-water triad, the grabbing of both an area of 1.8 million of hectares and reserves valued in almost 86 million of tons of lithium carbonate equivalent. Moreover, they reveal the geopolitic battle for control of the domestic resource, and an involvement of the Argentinean capital in the process substantially bigger than initially considered.

How to Avoid the Trick?: Heritage Discussions from Theban Tomb TT123, Luxor (Egypt) Pellini, José; Marconetto, María Bernarda; Gheco, Lucas Ignacio We introduce the surveys of the walls and ceilings of Theban tomb 123 (TT123), located on the West Bank of Luxor (Egypt). On the basis of the identification of material evidence of the different episodes of occupation and transformation of this place since its initial construction, which took place between 1479 and 1425 BC as the tomb of the scribe Amenemhet, until today, we reflect on the difficulties and consequences of the traditional approaches of conservation and restoration in Egypt. We argue that such places are subject to constant changes according to the uses and the agents they summoned all throughout their complex history. TT123 is not only a pharaoh’s tomb that deteriorated as a result of the passing of time but also far more than that. This paper seeks to explore the tension between more traditional approaches to conservation and restoration in Egypt and a more inclusive approach that recognizes the tomb’s passage through time.

Leer a Barthes: Los motivos de un placer Bitar, Francisco Miguel Desde sus primeros libros, leemos a Barthes con placer. Con esto quiero decir que su lectura tolera el ritual placentero de, como decía Calvino, los pies en alto: lo llevamos de viaje, de paseo, a la cama: al contrario de sus compañeros de estante, Barthes sale del estricto ámbito del estudio o la biblioteca para acompañarme, se diría, en el mundo. Si esto ocurre así, si lo leemos como si se tratara de un texto de placer, es porque su lectura se asemeja, en los mismos términos que el propio Barthes le ha conferido, a la lectura literaria: un trabajo al que se le ha extirpado todo esfuerzo, y cuya práctica, por estar hecha a la medida del cuerpo, sobrepasa nuestra memoria y nuestra consciencia (Barthes El susurro 42). Este trabajo reflexiona acerca del tipo de placer que –en términos del propio Barthes y auxiliados por una idea de Alain Robbe-Grillet– sería capaz de describir el deleite de su lectura, desprendido de una forma que, en su vertiginoso ir hacia adelante, propicia un modo especial de olvido, y situado en las cercanías de un tipo particular de ensayo de escritor.

Evidencias de validez de una escala de fortaleza mental en jugadores de deportes electrónicos de la Argentina; Validation of a mental toughness scale in CABA and GBA esports players; Validação de uma escala de força mental em jogadores de esportes eletrônicos CABA e GBA González, Pablo Christian; Resett, Santiago Alejandro; Moreno, José Eduardo La fortaleza mental es un importante constructo para los deportes siendo el Mental Toughness Index (MTI) uno de los instrumentos más usados a este respecto. En el último tiempo los juegos electrónicos crecieron de manera notoria y como en cualquier deporte la fortaleza mental es central para un desempeño exitoso. De este modo, el objetivo del presente estudio fue examinar las propiedades psicométricas del MTI en español ya que el mismo no está validado en dicho idioma. El único estudio existente en población española es uno con adultos mexicanos perosu objetivo era examinar su invarianza de medición con respecto a adultos atletas de los Estados Unidos. Para este fin, se conformó una muestra intencional, no probabilística de 550 jugadores de Esports (80% masculino) con una media de edad de 22 años (DE= 3.91) de Buenos Aires, Argentina. Al dividir la muestra en dos grupos en forma aleatoria, los resultados -tanto de análisis factoriales exploratorioscomo confirmatorios-arrojaron una estructura unifactorial similar a la postulada por los autores del cuestionario. La consistencia interna fue adecuada con un valor de .85. Se detectó la validez de constructo del cuestionario con la ansiedad y la motivación para los deportes por lo cual sería un instrumento con evidencia de propiedades para una rápida medición del constructo.; Mental toughness is an important construct for sports, and the Mental Toughness Index (MTI) is one of the most used instruments in this regard. Recently, electronic games have grown remarkably and, as in any sport, mental strength is essential for a successful performance. Thus, the aim of this study was to examine the psychometric properties of the MTI in Spanish, since it has not been validated in that language. The only existing study in the Spanish population is one with Mexican adults, but its objective was to examine its measurement invariance with respect to adult athletes from the United States. For this purpose, an intentional, non-probabilistic sample of 550 esports players (80% male) with a mean age of 22 years (SD = 3.91) from Buenos Aires, Argentina was formed. By dividing the sample into two groups at random, the results -both from exploratory and confirmatory factorial analyzes-yielded a unifactorial structure similar to that postulated by the authors of the questionnaire. Internal consistency was adequate with a value of.85. The construct validity of the questionnaire with anxiety and motivation for sports was detected, for which it would be an instrument with evidence of properties for a rapid measurement of the construct.; A força mental é um construto importante para no contexto do desporto, sendo o Índice de Resistência Mental (MTI) um dos instrumentos mais utilizados neste contexto. Nos últimos tempos, os jogos eletrônicos cresceram consideravelmente e, como em qualquer desporto, a força mental é essencial para um bom desempenho. Assim, o objetivo deste estudo foi examinar as propriedades psicométricas do MTI em espanhol, uma vez que não foi validado nesta língua. O único estudo existente na população espanhola foi com com adultos mexicanos, mas seu objetivo foi analisar a invariância em função de atletas adultos dos Estados Unidos. Para isso, recolheu-se uma amostra intencional e não probabilística de 550 jogadores de e-sports (80% do sexo masculino) com idade média de 22 anos (DP = 3,91) de Buenos Aires, Argentina. Ao dividir a amostra em dois grupos ao acaso, os resultados -tanto da análise fatorial exploratória e confirmatóriaproduziram uma estrutura unifatorial semelhante à postulada pelosautores do questionário. A consistência interna foi adequada com valor de 0,85. Foi detectada a validadede constructo do questionário com ansiedade e motivação no desporto, o que demonstra que o instrumento apresenta propriedades psicométricas adequadas para a avaliação do constructo em estudo.

Reading comprehension in undergraduates during the COVID-19 pandemic: Associations with executive function difficulties, reading habits and screen times Tabullo, Angel Javier; Chiofalo, María Florencia; Wainselboim, Alejandro Javier The COVID-19 pandemic and its concomitant restriction measures drastically altered the routines and learning formats of students from all levels. In addition, it has been shown that pandemic-related stress negatively impacted their mental health and cognitive functioning. Undergraduates have been signaled out as one of the populations most vulnerable to pandemic-related stressors. The following work examined the link between executive functions, perceived stress and reading comprehension among Argentinean university students during lockdown measures. In addition, potential effects of reading habits and screen exposure were considered. An executive function behavioral rating scale (ADEXI), a reading comprehension test and the PSS-10 stress questionnaire were administered to two-hundred social science students through an online survey. Executive difficulties increased with perceived stress, while lower inhibition was associated with longer TV times and being male. Stress and executive function associations can be interpreted as a detrimental effect, reverse or bidirectional causation. In turn, working memory issues led to worse comprehension (mediating the impact of perceived stress) while distal factors such as print exposure and mother education were positive predictors of reading outcomes (as expected). This finding suggests that undergraduates’ difficulties to manipulate online information interfered with expository text processing, resulting in poorer comprehension performance.

Enseñanza de matemáticas y ajustes razonables: Relato de una experiencia universitaria; Teaching Mathematics and reasonable accommodation: An account of a university experience Andrini, Leandro Ruben En este trabajo se relatará una experiencia particularllevada a cabo por un equipo de docentes de las dos primeras materias de la Lic. en Matemática, dictada en el Departamento de Matemática de la Facultad de Ciencias Exactas de la Universidad Nacional de La Plata. Esta experiencia fue coordinada desde la Dirección de Inclusión, Discapacidad y Derechos Humanos y la Secretaría de Asuntos Académicos de la Facultad, con amplia asistencia de la Dirección de Inclusión, Discapacidad y Derechos Humanos de la universidad, la que estuvo fundamentada atendiendo a las políticas de “ajustes razonables” consagradas en la Convención sobre los Derechos de las Personas con Discapacidad.; In this work a particular experience will be reported that was carried out by a team of teachers of the first two academic subjects of theDegree in Mathematics, dictated in the Department of Mathematics of the Faculty of Exact Sciences of the National University of La Plata. This experience was coordinated from the Directorate of Inclusion, Disability and Human Rights and theAcademicSecretariat of the Faculty, with extensive assistance of the Directorate of Inclusion, Disability and Human Rights of the University, based on the policies of“reasonable accommodation”enshrined in the Convention on the Rights of Persons with Disabilities.