Development and validation of the Spanish Work-Family Conflict Scale (SP-WFCS): Evidence from two independent samples in Argentina Pujol Cols, Lucas Joan Research on work-family conflict has increased dramatically in recent years. In this study, we developed a Spanish version of the Work-Family Conflict Scale (Carlson et al. Journal of Vocational Behavior, 56(2), 249–276, 2000) and examined its reliability, dimensionality, factor invariance, gender invariance, convergent validity, discriminant validity, and empirical validity. To this end, we analyzed data collected from two independent samples of Argentinian employees (N = 618). The results from the confirmatory factor analysis (CFA) revealed that the Spanish Work-Family Conflict Scale (SP-WFCS) displayed a sixdimensional factor structure (CFI ≥ .96, TLI = .96, RMSEA = .06). Furthermore, each dimension showed satisfactory levels of internal consistency (α estimates ranged from .80 to .92), convergent validity (AVE estimates ranged from .59 to .80, and CR estimates ranged from .81 to .92) and discriminant validity (AVE values ≥ shared variance estimates). Moreover, the results from the multi-group confirmatory factor analyses indicated that the six-dimensional model of the SP-WFCS was statistically invariant across samples and gender. Finally, most work-family conflict dimensions displayed significant correlations with three antecedents (i.e., quantitative demands, emotional demands, and core self-evaluations) and two outcomes (i.e., affective job satisfaction and burnout). Taken together, the results provided support to the validity of the SP-WFCS in Argentina, suggesting that it may be a reliable and valid instrument to measure work-family conflict in Spanish-speaking countries. Limitations to the study and opportunities for future research are discussed in this article.

Impacto en los flujos hídricos por la presencia de horizontes petrocálcicos en parcelas forestadas en ambientes de llanura Mujica, Claudio Ramon; Millone, G. M.; Bea, Sergio Andrés; Gyenge, Javier Enrique Alrededor del mundo existen numerosos paisajes con presencia de horizontes petrocálcicos, como en el caso de la llanura Pampeana en Sudamérica. En muchos casos, estos horizontes constituyen una barrera física al flujo de agua, e incluso un reservorio de agua para consumo de las plantas. La llanura Pampeana es uno de los paisajes económicamente más productivos de Argentina, y tal como en otras regiones que naturalmente estuvieron cubiertas con pastizales, estos han sido reemplazados por otros usos. En muchos casos, estos cambios en el uso del suelo han modificado los flujos hídricos y de solutos de estos sistemas, y el ejemplo más drástico es el de la forestación por su gran consumo de agua y la toma selectiva de solutos. Sin embargo, el impacto de esta práctica sobre suelos con presencia de horizontes petrocálcicos no ha sido suficientemente estudiado. Dentro de esta región se ha monitoreado variables hidrológicas de un conjunto parcelas de pastizal y forestación apareadas, con niveles de horizontes petrocálcicos. Se desarrolló un modelo numérico basado en procesos físicos/biológicos y condiciones de contorno atmosféricas, con el objetivo de cuantificar los flujos hídricos y el agua disponible para para el consumo de la forestación. Los resultados del modelo sugieren desconexión hidráulica entre la forestación y el freático debido a la presencia del horizonte petrocálcico, con solo un ~ 13% de agua adquirida a través del horizonte petrocálcico. Se predicen largos períodos de estrés hídrico durante los momentos de gran demanda atmosférica, y consumo de agua por parte de la forestación está restringido a las porciones por encima del horizonte petrocálcico. Las tazas de transpiración fueron de (~700-723 mm año-1) similar, o aun mayor a lo reportado en la zona. El horizonte petrocálcico retiene agua y reduce el drenaje profundo.

Construir la política con imágenes e instituir imágenes de lo político: Caras y Caretas, 1898-1916; Buil the politics with images and institute images of the political: Caras y Caretas, 1898-1916 Gómez, Silvana Anahí En el artículo consideramos el semanario Caras y Caretas en el período 1898 (año de su lanzamiento) hasta 1916 (momento en el que según la revista la iconografía política había cobrado importante protagonismo). Tras una breve presentación de Caras y Caretas, estudiamos los modos con los que el semanario plasmó la incorporación de imágenes en la política. Luego, abordamos caricaturas de portada a partir de un análisis indiciario. Los intensos vínculos entre palabras e imágenes así como la distinción entre la política y lo político recorren este trabajo.; In the article we consider the weekly Caras y Caretas in the period 1898 (year of its launch) until 1916 (at wich time acoording to the magazine the political iconography was developed). After a brief presentation of Caras y Caretas, we study the weekly review of the incorporation of images in politics. Rhen, we cover cartoons base don a index analysis. The intense links between Word and images as well as the distinction between politics and the politics go through this work.

Interaction between prospective risk factors in the prediction of suicide risk Grendas, Leandro; Rojas, Sasha M.; Puppo, Soledad; Vidjen, Patricia; Portela, Alicia Andrea; Chiapella, Luciana Carla; Rodante, Demián; Daray, Federico Manuel Background: To meet the goal of preventing suicide the most important thing is to know the risk factors of suicidal behavior and understand their interaction. Aims: The current study aims to evaluate prospective predictors and the interaction between factors for suicide and suicide re-attempts in high-risk, suicidal patients during a 24 month prospective follow-up period. Methods: A multicenter prospective cohort study was designed to compare data obtained from 324 patients admitted to the emergency department for current suicidal ideation or a recent suicide attempt. Participants were clinically evaluated at baseline and follow-up every 6 months to assess any unfavorable events (suicide or a suicide attempt). To estimate the rate of unfavorable events, the Kaplan–Meier method was used and Cox Proportional Hazards Regression Model was employed to examine predictors of suicide and suicide reattempt. Results: The incidence of a new suicide attempt was 26,000 events/100,000 persons-years. The incidence of death by suicide was 1110 events/100,000 person-year. The most reliable predictors of unfavorable events were being women, previous suicide attempts, younger age, and childhood sexual abuse. Findings revealed an interaction between childhood sexual abuse and low psychosocial functioning that increased the risk of an unfavorable event. Conclusion: The risk of suicide re-attempts and suicide in the current 2-year follow-up was high. There was an interaction between low psychosocial functioning and childhood sexual abuse. This evidence should be taken into account for the evaluation and planning of preventive strategies.

Psicomotricidad y recursos humanos: experiencia en una organización laboral de Argentina; Psychomotricity and human resources: experience in a labor organization in Argentina Castelletti, Adriel Fabricio; Vaja, Arabela Beatriz; Paoloni, Paola Veronica Rita En el presente artículo nos proponemos comentar una experiencia psicomotriz con adultos en un contexto laboral. Dicha experiencia tuvo como objetivo favorecer la conciencia corporal, la modulación del tono y adecuación postural y lograr un cambio de actitud general en el contexto sociolaboral. Ello se concretó a partir de la realización de dos talleres de Psicomotricidad utilizando la relajación como recurso técnico de intervención disciplinar. A los fines de compartir la experiencia, organizamos este escrito de la siguiente manera: en primer lugar,hacemos referencia al marco teórico que sustentó experiencia. En segundo lugar, describimos los talleres desarrollados y analizamos los resultados comentando las valoraciones que los participantes manifestaron a través de cuestionarios individuales escritos. Por último, referimos a las consideraciones finales, que contribuyen a pensar este nuevo escenario a partir del impacto de las propuestas realizadas a los adultos en este contexto y de los nuevos desafíos que las organizaciones plantean al psicomotricista.; In this article we propose to comment on a psychomotor experience with adults in a work context. This experience was aimed at promoting body awareness, tone modulation and postural adequacy and achieving a general attitude change in the socio-labor context. This was concretized after two Psychomotor workshops were carried out using relaxation as a technical resource for disciplinary intervention. For the purpose of sharing the experience, we organize this writing as follows: first, we refer to the theoretical framework that supported experience. Second, we describe the workshops developed and analyze the results by commenting on the evaluations that the participants expressed through written individual questionnaires. Finally, we refer to the final considerations, which consider this new scenario a thought based on the impact of the proposals made to adults in this context and the new challenges that organizations pose to the psychomotorist.

Effect of photoperiod on ovarian maturation in Cheirodon interruptus (Teleostei: Characidae); Efeito do fotoperíodo na maturação dos ovários em Cheirodon interruptus (Teleostei: Characidae) Garcia, Ignacio Daniel; Plaul, Silvia Elena; Torres, D.; del Fresno, Pamela Sabrina; Miranda, Leandro Andres; Colautti, Dario César Cheirodon interruptus is a ubiquitous small characid that inhabits the Pampean region and commonly used as bait. Its vast market is supplied from the wild population causing a significant environmental impact. In this study, we assessthe effect of photoperiod on ovarian maturation in order to evaluate its potential as a tool to manipulate reproduction under artificial conditions. Four treatments in triplicate (light: dark, L: D) were tested: 24L: 0D, 12L: 12D, 0L: 24D and a progressive photoperiod corresponding to the daily photoperiod increments in wild during winter-spring transition, accelerated three times. The experiment was conducted for 45 days. Gonadosomatic index (GSI), oocyte mean diameter, vitellogenic oocyte proportions, plasma estradiol concentrations (E2), condition factor (Kn) and standard length were estimated. Values of mean GSI, oocyte diameter, vitellogenic oocyte proportions and E2 concentration were maximum in the progressive treatment indicating vitellogenesis stimulation. In turn the same parameters were minimum in the 24L: 0D, revealing the vitellogenesis inhibition. This study showed that photoperiodic regime play an important role in the onset of ovarian maturation in C. interruptus.; Cheirodon interruptus é um pequeno caracídeo amplamente distribuído na região Pampeana e comumente usado como isca. Seu vasto mercado se abastece de populações silvestres causando um impacto ambiental significativo. Neste estudo, investigamos o efeito do fotoperíodo no amadurecimento do ovário para avaliar o potencial deste fator como ferramenta para manipular a reprodução em condições artificiais. Quatro tratamentos foram testados por triplicado (luz: escuro, L: D): 24L: 0D, 12L: 12D, 0L: 24D e um fotoperíodo progressivo que simula as mudanças das horas luz na natureza e na transição de inverno a primavera, acelerado três vezes. O experimento se realizou durante 45 dias. O índice gonadossomático (GSI), o diâmetro médio dos ovócitos, a proporção de ovócitos vitelogênicos, as concentrações plasmáticas de estradiol (E2), o fator de condição (Kn) e o comprimento padrão foram estimados. Os valores médios de GSI, o diâmetro dos ovócitos, as proporções de ovócitos vitelogênicos e a concentração de E2 foram maximizados no fotoperíodo progressivo, indicando estimulação de vitelogênesis. Por outro lado, esses mesmos parâmetros resultaram mínimos no tratamento 24L: 0D, revelando um efeito inibidor da vitelogênesis. Este estudo mostrou que as variações de fotoperíodo exercem um papel importante no início vitelogênesis reprodutiva em C. interruptus.

New algorithms for weighted k-domination and total k-domination problems in proper interval graphs Chiarelli, Nina; Hartinger, Tatiana Romina; Leoni, Valeria Alejandra; Lopez Pujato, María Inés; Milanič, Martin Given a positive integer k, a k-dominating set in a graph G is a set of vertices such that every vertex not in the set has at least k neighbors in the set. A total k-dominating set is a set of vertices such that every vertex of the graph has at least k neighbors in the set. The problems of finding the minimum size of a k-dominating, respectively total k-dominating set, in a given graph, are referred to as k-domination, respectively total k-domination. These generalizations of the classical domination and total domination problems are known to be NP-hard in the class of chordal graphs, and, more specifically, even in the classes of split graphs (both problems) and undirected path graphs (in the case of total k-domination). On the other hand, it follows from previous works by Bui-Xuan et al. (2013) [8] and by Belmonte and Vatshelle (2013) [3] that these two families of problems are solvable in time O(|V(G)|3k+4) in the class of interval graphs. We develop faster algorithms for k-domination and total k-domination in the class of proper interval graphs, by means of reduction to a single shortest path computation in a derived directed acyclic graph with O(|V(G)|2k) nodes and O(|V(G)|4k) arcs. We show that a suitable implementation, which avoids constructing all arcs of the digraph, leads to a running time of O(|V(G)|3k). The algorithms are also applicable to the weighted case.

Es-cueto, o el ensayo como distinción; Es-cueto, or the essay as a distinction Surghi, Carlos El presente texto despliega una lectura del ensayista argentino Sergio Cueto en relación al proyecto de investigación Escritura de la experiencia, escritura de la fascinación: pensamiento, vida y arte en el ensayo argentino contemporáneo. Partiendo de su último libro, Intimidad de las cosas (2018), es que nos proponemos relevar las diversas características del ensayo entendido como distinción, es decir, como modo de singularidad en la escritura. Para ello nuestro trabajo estudia la relación entre pensamiento y expresión, que en nuestro autor se evidencia no sólo en sus libros más recientes, Cinco retratos (2010), Kafka. Una construcción (2009), sino también en sus primeros libros: Seis estudios girrianos (1993), Maurice Blanchot. El ejercicio de la paciencia (1997). Para ello analizamos lo que hemos identificado como orientaciones constantes en la escritura de Cueto, las que van desde su interés por el interrogante que suponen las cosas como pregunta filosófica, hasta la poesía entendido en tanto que expresión de lo real, pasando también por el humor como pensamiento de la extravagancia, o la música como advenimiento de una experiencia imposible.; The present text displays a reading of the Argentine essayist Sergio Cueto. Starting from his last book, Intimidad de las cosas (2018), we propose to reveal the various characteristics of the essay understood as a distinction, that is, as a way of singularity in writing. For this our work studies the relationship between thought and expression, which in our author is evident not only in his most recent books, Cinco retratos (2010), Kafka. Una construcción (2009), but also in his first books: Seis estudios girrianos (1993), Maurice Blanchot. El ejercicio de la paciencia (1997). For this we analyze what we have identified as constant orientations in Cueto’s writing, which range from his interest in the question posed by things as a philosophical question, to poetry understood as an expression of reality, and also through humor as a thought of extravagance, or music as the advent of an impossible experience

Los estudiantes y sus metas académicas. Implicancias en el logro y retraso de los estudios Moreno, Jaquelinne; Chiecher, Analía Claudia; Paoloni, Paola Veronica Rita El artículo analiza las metas con que estudiantes de ingeniería afrontaron el aprendizaje en el momento de ingresar en la universidad y cinco años después. Particularmente interesan las relaciones de las metas, con el logro o demora en el cursado de la carrera. Participaron 48 estudiantes de ingeniería de la Universidad Nacional de Río Cuarto, pertenecientes a la cohorte 2012, quienes fueron contactados para la recolección de datos cinco años después de su ingreso. Los 48 sujetos dieron respuesta a un cuestionario administrado personalmente. Los resultados mostraron que entre los estudiantes con trayectorias de logro prevalecen desde el ingreso, y se sostienen cinco años después, metas de aprendizaje. Mientras que, en aquellos estudiantes que tras cinco años de cursado no habían aprobado aún el 50 % de la carrera, prevalecían metas tales como salvar la autoestima y evitar el fracaso, asociadas con la adopción de conductas poco favorables para el aprendizaje

Nano- and micro-mechanical properties of wheat grain by atomic force microscopy (AFM) and nano-indentation (IIT) and their relationship with the mechanical properties evaluated by uniaxial compression test Barrera, Gabriela; Méndez-Méndez, Juan; Arzate-Vázquez, Israel; Calderón-Domínguez, Georgina; Ribotta, Pablo Daniel The mechanical properties of hard and soft wheat cultivars at different structural-levels were evaluated at 10% and 15% moisture content by AFM, IIT and compression test. Nano and micro-indentation tests revealed that outer-pericarp cells of soft cultivar were stiffer than hard cultivar at 10% moisture. Bran-layers stiffness was reduced as a consequence of higher moisture levels in both cultivars. Additionally, endosperm hardness and stiffness were similar in both cultivars at 10% moisture, although soft-wheat endosperm was softer and less stiff than hard wheat at 15% moisture. Regarding compression test, soft cultivar showed lower fracture force than hard cultivar at the same moisture level. Moreover, stiffness, fracture force and deformation were reduced by higher moisture levels in both cultivars. The relationship between the nano-, micro- and macro-mechanical properties of wheat kernels indicated that soft cultivar at 10% and 15% was associated with stiffer outer-pericarp cells and higher fracture deformation, respectively. However, hard cultivar at 10% and 15% was related to higher endosperm hardness and fracture force and higher bran layers hardness, respectively.

Sensorimotor Transformations in the Zebrafish Auditory System Privat, Martin; Romano, Sebastián Alejo; Pietri, Thomas; Jouary, Adrien; Boulanger Weill, Jonathan; Elbaz, Nicolas; Duchemin, Auriane; Soares, Daphne; Sumbre, Germán Organisms use their sensory systems to acquire information from their environment and integrate this information to produce relevant behaviors. Nevertheless, how sensory information is converted into adequate motor patterns in the brain remains an open question. Here, we addressed this question using two-photon and light-sheet calcium imaging in intact, behaving zebrafish larvae. We monitored neural activity elicited by auditory stimuli while simultaneously recording tail movements. We observed a spatial organization of neural activity according to four different response profiles (frequency tuning curves), suggesting a low-dimensional representation of frequency information, maintained throughout the development of the larvae. Low frequencies (150–450 Hz) were locally processed in the hindbrain and elicited motor behaviors. In contrast, higher frequencies (900–1,000 Hz) rarely induced motor behaviors and were also represented in the midbrain. Finally, we found that the sensorimotor transformations in the zebrafish auditory system are a continuous and gradual process that involves the temporal integration of the sensory response in order to generate a motor behavior.

Chile violates Human Rights (and everyone can see it on Twitter) Bonnin, Juan Eduardo El texto hace un breve análisis del activismo digital en Twitter acerca de las violaciones a los derechos humanos en Chile, comparándolo con el informe Nunca Más en Argentina y, de esa manera, haciendo algunas preguntas acerca de qué tipo de memorias discursivas políticas podrán construirse en base a las redes sociales.El texto es mi columna mensual correspondiente al mes de noviembre.

Pleiotropic effects of alpha-SNAP M105I mutation on oocyte biology: ultrastructural and cellular changes that adversely affect female fertility in mice de Paola, Maria Matilde; Miró, María Paz; Ratto, Marcelo Hector; Bátiz, Luis Federico; Michaut, Marcela Alejandra After sperm-oocyte fusion, cortical granules (CGs) located in oocyte cortex undergo exocytosis and their content is released into the perivitelline space to avoid polyspermy. Thus, cortical granule exocytosis (CGE) is a key process for fertilization success. We have demonstrated that alpha-SNAP -and its functional partner NSF- mediate fusion of CGs with the plasma membrane in mouse oocytes. Here, we examined at cellular and ultrastructural level oocytes from hyh (hydrocephalus with hop gait) mice, which present a missense mutation in the Napa gene that results in the substitution of methionine for isoleucine at position 105 (M105I) of alpha-SNAP. Mutated alpha-SNAP was mislocalized in hyh oocytes while NSF expression increased during oocyte maturation. Staining of CGs showed that 9.8% of hyh oocytes had abnormal localization of CGs and oval shape. Functional tests showed that CGE was impaired in hyh oocytes. Interestingly, in vitro fertilization assays showed a decreased fertilization rate for hyh oocytes. Furthermore, fertilized hyh oocytes presented an increased polyspermy rate compared to wild type ones. At ultrastructural level, hyh oocytes showed small mitochondria and a striking accumulation and secretion of degradative structures. Our findings demonstrate the negative effects of alpha-SNAP M105 mutation on oocyte biology and further confirm the relevance of alpha-SNAP in female fertility.

Simulating cosmological substructure in the solar neighbourhood Simpson, Christine M.; Gargiulo, Ignacio Daniel; Gómez, Facundo Ariel; Grand, Robert J. J.; Maffione, Nicolas Pablo; Cooper, Andrew P.; Deason, Alis J.; Frenk, Carlos; Helly, John; Marinacci, Federico; Pakmor, Rüdiger We explore the predictive power of cosmological, hydrodynamical simulations for stellar phase-space substructure and velocity correlations with the AURIGA simulations and AURIGAIA mock Gaia catalogues. We show that at the solar circle the AURIGA simulations commonly host phase-space structures in the stellar component that have constant orbital energies and arise from accreted subhaloes. These structures can persist for a few Gyr, even after coherent streams in position space have been erased. We also explore velocity two-point correlation functions and find this diagnostic is not deterministic for particular clustering patterns in phase space. Finally, we explore these structure diagnostics with the AURIGAIA catalogues and show that current catalogues have the ability to recover some structures in phase space but careful consideration is required to separate physical structures from numerical structures arising from catalogue generation methods.

La metamorfosis de una economía agraria en la pampa argentina: Buenos Aires y Santa Fe entre las décadas de 1850 y 1890; The Transformation of an Agrarian Economy in Argentine Pampa: Buenos Aires and Santa Fe between the 1850s and 1890s Barcos, Maria Fernanda; Martiren, Juan Luis El trabajo analiza la evolución de las economías agrarias de dos provincias del área pampeana entre las décadas de 1850 y 1890, un período clave para la transformación agrícola argentina. El objetivo central es proponer una mirada comparativa entre Buenos Aires y Santa Fe, que permita examinar las distintas etapas y las características diferenciales que tuvo el desarrollo de la agricultura pampeana hasta transformarse en una de las principales actividades económicas en el cambio de siglo. Los casos presentados buscan evidenciar cómo los ensayos de colonización agrícola santafesina lograron asentar una receta productiva de agricultura extensiva que desplazaría no solo a las tradicionales formas de producción agraria bonaerense, sino que también competiría con su dinámica producción ganadera.; The paper focuses on the divergent evolution of two agrarian economies in Argentine pampas between the decades of 1850 and 1890 . Through a comparative exercise of Buenos Aires and Santa Fe provinces, the paper tries to show the stages and the particular charac-teristics that addressed the development of Pampean agriculture expansion till the turn of the century . We assume that farming agriculture in Santa Fe succeeded to expand a produc-tive recipe of extensive agriculture that would displace not only the traditional forms of agri-cultural production in Buenos Aires, but also compete with its dynamic livestock production

Exsolution and electrochemistry in perovskite solid oxide fuel cell anodes: Role of stoichiometry in Sr(Ti,Fe,Ni)O3 Zhu, Tenglong; Troiani, Horacio Esteban; Mogni, Liliana Verónica; Santaya, Mariano; Han, Minfang; Barnett, Scott A. The exsolution of metal cations from oxides under reducing fuel conditions results in the formation of surface metallic nanoparticles, which can reduce Solid Oxide Fuel Cell anode polarization resistance. However, the loss of the B-site cations shifts the stoichiometry of the perovskite oxide. Depending on the amount exsolved and the initial stoichiometry, the exsolution can presumably shift the oxide away from its single-phase perovskite region. Herein, the direct comparison of initially stoichiometric composition Sr(Ti0.3Fe0.63Ni0.07)O3-δ (STFN0) with initially A-site deficient Sr0.95(Ti0.3Fe0.63Ni0.07)O3-δ (STFN5) is conducted and reported. X-ray diffraction along with scanning and transmission electron microscopy analysis of the oxides, which are both reduced at 850 °C in H2/H2O/Ar, shows a similar size and density of exsolved Fe–Ni alloy nanoparticles, albeit with slightly different alloy compositions. Whereas the oxide phase in reduced STFN5 shows a well-ordered perovskite structure, the greater B-site deficiency in reduced STFN0 results in a highly disordered and strained structure. The electrochemical performance of STFN0 anodes is inferior to that of STFN5 anodes, and even worse than SrTi0.3Fe0.7O3-δ (Ni-free) anodes. It appears that an initial Sr deficiency is important to avoid a too-high B-site deficiency after exsolution, which distorts the perovskite structure and impairs electrochemical processes.

Lógica del capital, crítica del valor y metapsicología freudiana: una reescritura categorial del pensamiento de León Rozitchner; Logic of Capital, Critic of Value and Freudian Metapsychology: A Reading of the Thought of León Rozitchner Exposto, Emiliano; Rodriguez Varela, Gabriel El artículo realiza una interpretación de la lectura que el filósofo argentino León Rozitchner opera sobre la meta-psicología freudiana en sus textos Freud y los límites del individualismo burgués (1972) y Freud y el problema del poder (1985). El objetivo es explorar nuevas cifras de inteligibilidad para repensar el diálogo crítico entre psicoanálisis freudiano y marxismo, revisitando la concepción rozitchneriana sobre la subjetividad a partir de las categorías propiciadas por la teoría crítica del valor.; The article makes an interpretation of the reading that the argentine philosopher Leon Rozitchner operates on the Freudian meta-psychology in his texts Freud and the limits of bourgeois individualism (1972) and Freud and the problem of power (1985). The aim is to explore new intelligibility figures to rethink the critical dialogue between Freudian psychoanalysis and Marxism, revisiting Rozitchner's conception of subjectivity from the categories fostered by the critical theory of the value.

Ex vivo and in vivo effects of arsenite on GST and ABCC2 activity and expression in the middle intestine of the rainbow trout Oncorhynchus mykiss Painefilú, Julio César; Pascual, Mariano Martin; Bieczynski, Flavia; Laspoumaderes, Cecilia; González, Carolina; Villanueva, Silvina Stella Maris; Luquet, Carlos Marcelo In fish of freshwaters environments, the accumulation and toxic effects of arsenite (AsIII) can be attenuated by detoxification proteins such as GST and ABCC transporters. We studied the effects of AsIII on the middle intestine of O. mykiss in ex-vivo and in vivo/ex vivo assays. For the ex vivo assays, we measured the transport rate of the ABCC substrate DNP-SG and GST activity in intestinal strips and everted sacs. AsIII inhibited DNP-SG transport in a concentration-dependent manner, specifically when we applied it on the basolateral side. GST activity increased when we applied a maximum concentration of AsIII. For the in vivo/ex vivo assays, we kept fish in water with or without 7.7 μmol L− 1 of AsIII for 48 h. Then, we measured DNP-SG transport rate, GST activity, and PP1 activity in intestine strips during one hour. For PP1 activity, we incubated the strips with or without microcystin-LR (MCLR), a toxin excreted through ABCC2 proteins. We also analyzed Abcc2 and Gst-π mRNA expression in intestine and liver tissue. In the group exposed in vivo to AsIII, DNP-SG transport rate and GST activity were higher and the effect of MCLR over PP1 activity was attenuated. AsIII significantly induced only Abcc2 mRNA expression in both middle intestine and liver. Our results suggest that, in the middle intestine of O. mykiss, AsIII is absorbed mainly at the basolateral side of the enterocytes, excreted to the lumen by ABCC2 transporters, and is capable of modulating Abcc2 mRNA expression by a transcriptional mechanism.

Onset of foreland basin deposition in the Neuquén Basin (34°-35°S): New data from sedimentary petrology and U–Pb dating of detrital zircons from the Upper Cretaceous non-marine deposits Gómez, Ricardo Ernesto; Lothari, Lucas Daniel; Tunik, Maisa Andrea; Casadio, Silvio Alberto A multi-proxy provenance approach using sedimentology, petrology and detrital zircon U–Pb geochronology provides new constrains for the evolution of the Southern Central Andes. The Upper Cretaceous non-marine deposits of the Neuquén Basin referred as Neuquén Group in the central and southern sector of the basin, have been characterized as the first foreland basin associated with the early uplift of the Andean orogen at ca. 100 Ma. However, in the northern sector of the basin, the stratigraphically equivalent Diamante Formation has not been studied in detail yet. This work focuses in the outcrops of the Diamante Formation located between Laguna del Diamante and Atuel River in southern Mendoza Province, Argentina (34°-35°S). The petrographic analysis of sandstones shows high content of volcanic and calcareous lithic fragments suggesting provenance from the underlying sedimentary units and the coeval volcanic arc associated with the onset of an important stage of deformation on the west. Detrital zircons from the base of the Diamante Formation were supplied sources from Upper Jurassic and Lower Cretaceous that were exposed during Upper Cretaceous times, whereas in the top, a high content of Permo-Triassic detrital zircons indicates exhumation of the surrounding Permo-Triassic crystalline basement. Finally, two maximum depositional ages were obtained, 107.2 ± 1.4 Ma to Vega de los Patos and 91.1 ± 2.2 Ma to Vega Grande, suggesting uninterrupted activity of the volcanic arc during foreland basin deposition. In particular, the age of 107.2 Ma would indicate that the sedimentation of the Upper Cretaceous non-marine deposits occurred in the Albian at these latitudes (34°-35°S), which suggests that the onset of the foreland basin sedimentation is diachronic at different positions in the Neuquén Basin.

El Dinggedicht en la crisis de la representación: Un ejemplo del poeta Paul Zech; The Dinggedicht in the Crisis of Representation: An Example by the Poet Paul Zech Sufotinsky Reynoso, Eric Tomás El Dinggedicht (poema-objeto) es un tipo de composición poética de cierta tradición en la lírica alemana que, en el marco de la crisis de la representación artística que comienza a mediados del siglo XIX y en el del período de las vanguardias históricas, adquiere una importancia particular como forma de elaboración del objeto artístico. Dentro de su tradición, han sido Rainer Maria Rilke –tanto por sus producciones como por sus reflexiones al respecto– y Paul Zech grandes exponentes de este tipo de forma poética.; The Dinggedicht (object-poem) is a kind of poetic composition. It has a certain tradition in German poetry. It develops in the context of art representation crisis –which begins in the mid-19th century– and of the historical avant-gardes. During this period, the Dinggedicht acquires a peculiar significance as a way of elaborating the artistic object. Within its tradition Rainer Maria Rilke –not only because of his productions, but also because of his reflections on the subject– and Paul Zech were among the most important exponents of this kind of poetic form.