Dynamics of entanglement between two harmonic modes in stable and unstable regimes Rebón, Lorena; Canosa, Norma Beatriz; Rossignoli, Raúl Dante The exact dynamics of the entanglement between two harmonic modes generated by an angular momentum coupling is examined. Such a system arises when considering a particle in a rotating anisotropic harmonic trap or a charged particle in a fixed harmonic potential in a magnetic field, and it exhibits a rich dynamical structure, with stable, unstable, and critical regimes according to the values of the rotational frequency or field and trap parameters. Consequently, it is shown that the entanglement generated from an initially separable Gaussian state can exhibit quite distinct evolutions, ranging from quasiperiodic behavior in stable sectors to different types of unbounded increase in critical and unstable regions. The latter lead, respectively, to logarithmic and linear growth of the entanglement entropy with time. It is also shown that entanglement can be controlled by tuning the frequency, such that it can be increased, kept constant, or returned to a vanishing value with just stepwise frequency variations. Exact asymptotic expressions for the entanglement entropy in the different dynamical regimes are provided.

Movimientos Sociales y conflicto: la experiencia de Argentina (1993-2012) Fernández, Paula Daniela; Romero, Fernando Gabriel El conflicto social es un fenómeno que caracteriza la historia de la Argentina reciente y que se profundizó con el avance de las políticas neoliberales. Si bien la represión de la última dictadura cívico-militar (1976-1983) significó un duro golpe para los movimientos sociales de larga tradición -como el movimiento obrero y el movimiento estudiantil-, el retorno de la democracia demostró que estos actores seguían en pie. Con el final del último gobierno de facto se extendió el accionar público de nuevos sujetos ?en muchos casos de fuerte activismo en el contexto de terrorismo de Estado- que se relacionaban no sólo con los derechos humanos y el reclamo de derechos civiles sino también con las consecuencias generadas por el establecimiento progresivo del programa neoliberal.El presente texto se propone hacer un recorrido por las situaciones de conflicto social y acción colectiva más destacadas del período 1993-2012, considerando una breve reflexión teórica sobre el concepto de movimientos sociales y analizando la evolución de los modelos de acumulación por los que atraviesa el país a partir de 1976. Estos puntos resultan claves para comprender la experiencia de los sujetos y el conflicto social en la Argentina reciente.

La mirada etnográfica sobre lo político: al gunas consideraciones teórico-metodológicas Alucin, Silvia Vanesa; González, Gabriela En este trabajo nos proponemos realizar un recorrido por una parte de la historia de la disciplina antropológica y las formas en que la misma abordó y aborda el análisis de la política y lo político en el mundo moderno. Nos interesa puntualizar en el surgimiento y trayectoria que la denominada Antropología “Política” tuvo en gran parte del siglo XX y las nuevas perspectivas que fueron retomadas a partir de allí, con el surgimiento de la Antropología “de la Política”. Tanto en uno como en el otro encontramos un elemento en común, el estudio de la política desde una mirada etnográfica, el cual quisiéramos destacar en tanto posee una riqueza analítica particular.; In this paper we propose to take a tour of a part of the history of the discipline of anthropology and the ways in which it addressed and discusses the analysis of policy and politics in the modern world. We want to point out in the emergence and trayectory of which has been called “Politic Anthropology” in much of the twentieth century and the new perspectives that were taken over from there, with the emergence of Anthropology “of Policy”. Both in one as in the other find a common element, the study of politics from an ethnographic view, which we would like to highlight as it has a particular analytical richness.

Three-dimensional reconstruction of corticospinal tract using one-photon confocal microscopy acquisition allows detection of axonal disruption in spinal cord injury Quintá, Héctor Ramiro; Pasquini, Laura Andrea; Pasquini, Juana Maria The principal motor tract involved in mammalian locomotor activities is known as the corticospinal tract (CST), which starts in the brain motor cortex (upper motor neuron), extends its axons across the brain to brainstem and finally reaches different regions of spinal cord, contacting the lower motor neurons. Visualization of the CST is essential to carry out studies in different kinds of pathologies such as spinal cord injury or multiple sclerosis. At present, most studies of axon structure and/or integrity that involve histological tissue sectioning present the problem of finding the region where the CST is predominant. To solve this problem, one could use a novel technique to make the tissues transparent and observe them directly without histological sectioning. However, the disadvantage of this procedure is the need of costly and non-conventional equipment, such as two-photon fluorescence microscopy or ultramicroscopy to perform the image acquisition. Here, we show that labeling the CST with FluoroRuby in the motor cortex and then performing the clearing technique, the z-acquisition of the entire CST in unsectioned tissue followed by three-dimensional reconstruction can be carried out by standard one-photon confocal microscopy, with yields similar to those obtained by two-photon microscopy. In addition, we present an example of the application of this method in a spinal cord injury model, where the disruption of CST is shown at the lesion site.

Primordial magnetic helicity from stochastic electric currents Calzetta, Esteban Adolfo; Kandus, Alejandra We study the possibility that primordial magnetic fields generated in the transition between inflation and reheating posses magnetic helicity, HM. The fields are induced by stochastic currents of scalar charged particles created during the mentioned transition. We estimate the rms value of the induced magnetic helicity by computing different four-point SQED Feynman diagrams. For any considered volume, the magnetic flux across its boundaries is in principle non null, which means that the magnetic helicity in those regions is gauge dependent. We use the prescription given by Berger and Field and interpret our result as the difference between two magnetic configurations that coincide in the exterior volume. In this case the magnetic helicity gives only the number of magnetic links inside the considered volume. We calculate a concrete value of HM for large scales and analyze the distribution of magnetic defects as a function of the scale. Those defects correspond to regular as well as random fields in the considered volume. We find that the fractal dimension of the distribution of topological defects is D=1/2. We also study if the regular fields induced on large scales are helical, finding that they are and that the associated number of magnetic defects is independent of the scale. In this case the fractal dimension is D=0. We finally estimate the intensity of fields induced at the horizon scale of reheating, and evolve them until the decoupling of matter and radiation under the hypothesis of inverse cascade of magnetic helicity. The resulting intensity is high enough and the coherence length long enough to have an impact on the subsequent process of structure formation.

Synoptic sea level pressure patterns–daily rainfall relationship over the Argentine Pampas in a multi-model simulation Bettolli, Maria Laura; Penalba, Olga Clorinda The ability of 17 global circulation models to simulate daily rainfall of the Pampas region is assessed for winter and summer, key seasons for crop production in the region. Principal Component Analysis combined with k-means Cluster Analysis is employed to examine the models' representation of the relationship between daily sea level pressure of southern South America and rainfall. Models represent this relationship better for winter, reflecting their ability to reproduce winter synoptic scale patterns associated with rainfall. They precipitate too frequently at low intensity and less frequently at high intensity. This characteristic is more accentuated in winter.

Ultrafast quantitation of six quinolones in water samples by second-order capillary electrophoresis data modeling with multivariate curve resolution–alternating least squares Alcaraz, Mirta Raquel; Vera Candioti, Luciana; Culzoni, Maria Julia; Goicoechea, Hector Casimiro This paper presents the development of a capillary electrophoresis method with diode array detector coupled to multivariate curve resolution–alternating least squares (MCRALS) to conduct the resolution and quantitation of a mixture of six quinolones in the presence of several unexpected components. Overlapping of time profiles between analytes and water matrix interferences were mathematically solved by data modeling with the well-known MCR-ALS algorithm. With the aim of overcoming the drawback originated by two compounds with similar spectra, a special strategy was implemented to model the complete electropherogram instead of dividing the data in the region as usually performed in previous works. The method was first applied to quantitate analytes in standard mixtures which were randomly prepared in ultrapure water. Then, tap water samples spiked with several interferences were analyzed. Recoveries between 76.7 and 125 % and limits of detection between 5 and 18 μg L−1 were achieved.

Acerca del valor adaptativo del asco moralizado desde una perspectiva evolucionista; On the adaptive value of moralized revulsion from an evolutionist perspective; Sobre o valor adaptativo do nojo moralizado sob uma perspectiva evolucionista Zavadivker, María Natalia Se aborda, desde una perspectiva evolucionista, el papel desempeñado por el “asco moralizado”, entendido como repulsión emocional ante individuos y prácticas sociales que consideramos objeto de evaluación moral. Se parte de un análisis general de la emoción de asco y sus desencadenantes. A continuación, se abordan dos posiciones opuestas en relación con la confiabilidad y valor instrumental del asco para promover juicios morales “adecuados” e incitar a la acción moral. Se propone una reinterpretación del problema desde un enfoque evolucionista, procurando correlacionar los diversos juicios de valor que puede promover el asco moralizado, con diferentes estrategias adaptativas. Finalmente, se correlacionan tales estrategias con posiciones morales liberales y conservadoras.; The article addresses the role played by “moralized revulsion”, understood as the emotional disgust we feel against individuals and social practices that we deem to be the object of moral evaluation, from an evolutionist perspective. The first part provides a general analysis of the emotion of revulsion and its triggers. Then, the paper discusses two opposing positions regarding the reliability and instrumental value of revulsion in promoting “adequate” moral judgments and inciting to moral action. It then proposes a reinterpretation of the problem from an evolutionist perspective, attempting to correlate the diverse value judgments promoted by moralized revulsion with different adaptive strategies. Finally, it correlates those strategies with liberal and conservative moral positions.; Este artigo pretende abordar, sob uma perspectiva evolucionista, o papel desempenhado pelo “nojo moralizado”, entendido como repulsão emocional ante indivíduos e práticas sociais que consideramos objeto de avaliação moral. Parte-se de uma análise geral da emoção de nojo e seus desencadeantes. A seguir, abordamse duas posições opostas em relação com a confiabilidade e valor instrumental do nojo para promover juízos morais “adequados” e incitar a ação moral. Propõese uma reinterpretação do problema a partir de um enfoque evolucionista, o qual procura correlacionar os diversos juízos de valor que o nojo moralizado pode promover, com diferentes estratégias adaptativas. Finalmente, correlacionam-se essas estratégias com posições morais liberais e conservadoras.

A multigene phylogenetic synthesis for the class Lecanoromycetes (Ascomycota): 1307 fungi representing 1139 infrageneric taxa, 317 genera and 66 families Passo, Alfredo The Lecanoromycetes is the largest class of lichenized Fungi, and one of the most species-rich classes in the kingdom. Here we provide a multigene phylogenetic synthesis (using three ribosomal RNA-coding and two protein-coding genes) of the Lecanoromycetes based on 635 newly generated and 3307 publicly available sequences representing 1139 taxa, 317 genera, 66 families, 17 orders and five subclasses (four currently recognized: Acarosporomycetidae,  Lecanoromycetidae, Ostropomycetidae, Umbilicariomycetidae; and one provisionarily recognized, Candelariomycetidae). Maximum likelihood phylogenetic analyses on four multigene datasets assembled using a cumulative supermatrix approach with a progressively higher number of species and missing data (5-gene, 5+4-gene, 5+4+3-gene and 5+4+3+2-gene datasets) show that the current classification includes non-monophyletic taxa at various ranks, which need to be recircumscribed and require revisionary treatments based on denser taxon sampling and more loci. Two newly circumscribed orders (Arctomiales and Hymeneliales in the Ostropomycetidae) and three families (Ramboldiaceae and Psilolechiaceae in the Lecanorales, and Strangosporaceae in the Lecanoromycetes inc. sed.) are introduced. The potential resurrection of the families Eigleraceae and Lopadiaceae is considered here to alleviate phylogenetic and classification disparities. An overview of the photobionts associated with the main fungal lineages in the Lecanoromycetes based on available published records is provided. A revised schematic classification at the family level in the phylogenetic context of widely accepted and newly revealed relationships across Lecanoromycetes is included. The cumulative addition of taxa with an increasing amount of missing data (i.e., a cumulative supermatrix approach, starting with taxa for which sequences were available for all five targeted genes and ending with the addition of taxa for which only two genes have been sequenced) revealed relatively stable relationships for many families and orders. However, the increasing number of taxa without the addition of more loci also resulted in an expected substantial loss of phylogenetic resolving power and support (especially for deep phylogenetic relationships), potentially including the misplacements of several taxa. Future phylogenetic analyses should include additional single copy protein-coding markers in order to improve the tree of the Lecanoromycetes. As part of this study, a new module (Hypha) of the freely available Mesquite software was developed to compare and display the internodal support values derived from this cumulative supermatrix approach.

Stability of cosmological detonation fronts Membiela, Federico Agustin; Megevand, Ariel Hugo The steady state propagation of a phase transition front is classified, according to hydrodynamics, as a deflagration or a detonation, depending on its velocity with respect to the fluid. These propagation modes are further divided into three types, namely, weak, Jouguet, and strong solutions, according to their disturbance of the fluid. However, some of these hydrodynamic modes will not be realized in a phase transition. One particular cause is the presence of instabilities. In this work we study the linear stability of weak detonations, which are generally believed to be stable. After discussing in detail the weak detonation solution, we consider small perturbations of the interface and the fluid configuration. When the balance between the driving and friction forces is taken into account, it turns out that there are actually two different kinds of weak detonations, which behave very differently as functions of the parameters. We show that the branch of stronger weak detonations are unstable, except very close to the Jouguet point, where our approach breaks down.

Sipunculan celomocytes increase the resistance to H2O2-induced cell death under hypoxia Lombardo, Tomás; Peralta, Diego Matias; Kornblihtt, L.; Blanco, Guillermo Armando C. Themiste petricola is a marine intertidal endolithic worm that experiences transient hypoxia within its habitat, owing to natural sediment movements or increased organic enrichment. We characterized and quantified the cytotoxic effect of H2O2 in celomocytes of the sipunculan Themiste petricola under normoxia and hypoxia (O2 < 0.1 %) through the median effect method. The 50 % cell death H2O2 dose at 24 h (EC50) under normoxia was 1.5 mM. The range EC10-EC90 was 0.6 mM - 3.9 mM. The fraction of cells having collapsed mitochondrial membrane potential (MMP) was increased dose-dependently after 3 h exposure with 24 h cytotoxic doses of H2O2 from EC10 to EC90. The 24 h cytotoxic dose inducing 50 % of cells with collapsed MMP at 3 h was 3.67 mM. Intracellular superoxide anion production was increased dose-dependently, while reduced glutathione was decreased dose-dependently at 3 h with H2O2 from EC10 to EC90. Exposure to 24 h hypoxia did not cause cell death but induced intracellular acidification. The 24 h EC50 of H2O2 under hypoxia was increased to 4.7 mM while the range EC10-EC90 was increased to 0.9 mM - 25.1 mM. We conclude that hypoxia induces anaerobic metabolism and increases tolerance to H2O2-induced cell death in celomocytes of Themiste petricola preserving the immune functions and providing an advantage to survive under low oxygen tension.

Ecological aspects of an isolate of Steinernema diaprepesi (Rhabditida: Steinernematidae) from Argentina del Valle, Eleodoro Eduardo; Balbi, Emilia Inés; Lax, Paola; Rondán Dueñas, Juan; Doucet, Marcelo Edmundo Ecological aspects of Steinernema diaprepesi isolate SRC were studied to evaluate the species potential as biological control agent of insect pests. Under laboratory 15 conditions, the following aspects were determined: the nematode life cycle, pathogenicity to several arthropods, reproductive capacity, tolerance to desiccation, effect of temperature on survival and infectivity of infective juveniles (IJs), and influence of soil texture and soil water potential on the isolate. The parasitic cycle on last-instar larvae of Galleria mellonella at 25°C was completed 8 days after infection. The nematode showed high virulence to lepidopteran larvae, being limited or nil in the remaining orders of arthropods evaluated. An acceptable offspring production of S. diaprepesi was confirmed in the species G. mellonella and S. frugiperda, suggesting that the isolate would have potential for control of lepidopteran larvae. Optimum temperature for reproduction was 20?25°C. IJs survived exposure to a range of temperatures between 10 and 40°C, with a significant reduction in the number of live IJs at 40°C. The nematodes remained infective at 20?40°C. IJ mortality was 100% on day 6 of exposure to 85% RH. The movement of IJs observed in the soil column experiments revealed that the isolate uses a cruiser-type search strategy. Soil texture and water potential significantly influenced IJ movement, search and penetration of G. mellonella larvae. The efficacy of this isolate was found to be favoured in sandy soils, regardless of the soil water potential.

Effects of pyruvate on the energetics of rat ventricles stunned by ischemia-reperfusion Bonazzola, Patricia; Ragone, María Inés; Consolini, Alicia E. Pyruvate (Pyr) was proposed as an additive to cold high-K(+)-low-Ca(2+) cardioplegia (CPG) to protect the heart during surgery. We explored whether Pyr and CPG would work synergistically to protect rat hearts from stunning during ischemia-reperfusion (I/R). We measured the heat release and contractility of perfused ventricles during I/R, and the cytosolic and mitochondrial [Ca(2+)] in cardiomyocytes by confocal microscopy. We found that under cold-CPG (30 °C), 10 mmol·L(-1) Pyr reduced the post-ischemic contractile recovery (PICR) as well as muscle economy, when added either before ischemia or during I/R, which was reversed by blockade of UCam. In noncardioplegic hearts, Pyr was cardioprotective when it was present during I/R, more so at 37 °C than at 30 °C, with improved economy. In cardiomyocytes, the addition of Pyr to CPG slightly increased the mitochondrial [Ca(2+)] but decreased cytosolic [Ca(2+)]. The results suggest that Pyr only protects hearts from stunning when present before ischemia and during reperfusion, and that it dampens the cardioprotective properties of CPG. The mechanisms underlying such different behavior depend on the dynamic balance between Pyr stimulation of the energetic state and mitochondrial Ca(2+) uptake. Our results support the use of Pyr in stunned hearts, but not in cold high-K(+) cardioplegia.

Digital electronics for the Pierre Auger Observatory AMIGA muon counters Wainberg, O.; Almela, Daniel Alejandro; Platino, Manuel; Sanchez, Federico Andrés; Suarez, Federico; Lucero, Luis Agustin; Videla, M.; Wundheiler, Brian; Melo, Diego Gabriel; Hampel, Matias Rolf; Etchegoyen, Alberto The ``Auger Muons and Infill for the Ground Array´´ (AMIGA) project provides direct muon counting capacity to the Pierre Auger Observatory and extends its energy detection range down to 0.3 EeV. It currently consists of 61 detector pairs (a Cherenkov surface detector and a buried muon counter) distributed over a 23.5 km2 area on a 750 m triangular grid. Each counter relies on segmented scintillator modules storing a logical train of `0´s and `1´s on each scintillator segment at a given time slot. Muon counter data is sampled and stored at 320 MHz allowing both the detection of single photoelectrons and the implementation of an offline trigger designed to mitigate multi-pixel PMT crosstalk and dark rate undesired effects. Acquisition is carried out by the digital electronics built around a low power Cyclone III FPGA. This paper presents the digital electronics design, internal and external synchronization schemes, hardware tests, and first results from the Observatory.

Conjuntos líticos Formativos del sitio Alero Cuevas (Salta, Argentina): puesto de caza de pastores de altura; Formative lithic assemblages from Alero Cuevas site (Salta, Argentina): highlands herders hunting spot Mercuri, Cecilia Aquí se presenta el análisis del material lítico proveniente del sitio Alero Cuevas fechado en 2020 AP. El sitio se encuentra localizado en la cuenca de Santa Rosa de los Pastos Grandes, en la Puna de la provincia de Salta. Este trabajo constituye un aporte al estudio de los conjuntos artefactuales de sociedades de base pastoril temprana. Se presentan las tendencias generales del conjunto lítico, a fin de explorar regularidades en algunos atributos tecnomorfológicos para caracterizar patrones en la confección/uso de conjuntos líticos que permitan discutir la funcionalidad del sitio. Los resultados indican que el Alero Cuevas ha sido utilizado como un sitio estacional por pastores-cazadores de altura.; The analysis of lithic assemblage from the Alero Cuevas site –dated on 2020 BP– is presented. It is located in the Santa Rosa de los Pastos Grandes basin, in the Puna of Salta province. This paper is a contribution to the study of artifact sets of early herding societies. We inform the general trends of the lithic assemblage in order to explore regularities in some techno-morphological attributes and, in turn, to characterize patterns in making / using lithic assemblages that allowed us to discuss site functionality. The results show Alero Cuevas was used as a seasonal site of highlands by herding- hunters.

Molecular phylogeny of the New World gecko genus Homonota (Squamata: Phyllodactylidae) Morando, Mariana; Medina, Cintia Débora; Avila, Luciano Javier; Perez, Cristian Hernan Fulvio; Buxton, Amy; Sites Jr., Jack W. The genus Homonota was described by Gray (1845) and currently includes 10 species: Homonota andicola, H. borellii, H. darwinii, H. fasciata, H. rupicola, H. taragui, H. underwoodi, H. uruguayensis, H. williamsii & H. whitii and one subspecies of H. darwinii (H. darwinii macrocephala). It is distributed from 15° latitude south in southern Brazil, through much of Bolivia, Paraguay, Uruguay and Argentina to 54° south in Patagonia and across multiple different habitats. Several morphological taxonomic studies on a subset of these species have been published, but no molecular phylogenetic hypotheses are available for the genus. The objective of this study is to present a molecular phylogenetic hypothesis for all the described species in the genus. We sequenced two mitochondrial genes (cyt-b & 12S: 1745 bp), seven nuclear protein coding (RBMX, DMLX, NKTR, PLRL, SINCAIP, MXRA5, ACA4: 5804 bp) and two anonymous nuclear loci (30Hb, 19Hb: 1306 bp) and implemented traditional concatenated analyses (MP, ML, BI) as well as species-tree (*beast) approaches. All methods recovered almost the same topology. We recovered the genus Homonota as monophyletic with strong statistical support. Within Homonota, there are three strongly supported clades (whitii, borellii and fasciata), which differ from those previously proposed based on scale shape, osteology, myology and quantitative characters. Detailed morphological analyses based on this highly resolved and well-supported phylogeny will provide a framework for understanding morphological evolution and historical biogeography of this phenotypically conservative genus. We hypothesize that extensive marine transgressions during Middle and Late Miocene most probably isolated the ancestors of the three main clades in eastern Uruguay (borellii group), north-western Argentina-southern Bolivia (fasciata group), and central-western Argentina (whitii group). Phylogeographic and morphological/morphometric analyses coupled with paleo-niche modelling are needed to better understand its biogeographical history.

Provincia de Buenos Aires: Mirada integral sobre el proyecto de policía municipal Spota, Julio César En la actualidad el debate en torno a la descentralización de las fuerzas de seguridad ganó entidad parlamentaria en la Provincia de Buenos Aires de la mano de la presentación de sucesivos proyectos legislativos. Distintos en su autoría pero afines en su espíritu, las iniciativas parlamentarias formuladas en la órbita política bonaerense aspiran a darle curso a la creación de cuerpos policiales municipales en aquellas jurisdicciones que superen un determinado número de habitantes (siendo la propia magnitud del guarismo un objeto de disputa entre los respectivos autores pero donde las diferencias cuantitativas oscilan entre los 70 y los 100 mil habitantes). En lo que hace a la presente exposición tomaremos como referencia los proyectos impulsados por el Gobernador Daniel Scioli y el diputado Marcelo Saín, con objeto de reflexionar en torno a los resultados susceptibles de ser esperados a raíz de la sanción efectiva de alguna de las propuestas aludidas. Sobre el particular es de especial interés atender a las especificidades normativasrectoras en el territorio nacional, provincial y local, como marco legal donde adquiere sentido el contenido conceptual de las categorías debatidas en los proyectos denotados. De forma convergente, las propuestas giran en torno a la descentralización en calidad de estrategia de desarrollo institucional conducente al diseño de las policías municipales. Cabe destacar que la descentralización remite a la acción y efecto de transferir distintos organismos y parte de laautoridad previamente ejercida por una unidad decisora central, en procura de la creación de reparticiones públicas dotadas de personalidad jurídica, patrimonio y presupuesto (la autarquía es esencial para la configuración de un proceso efectivo de descentralización).

Effects of fire on arbuscular mycorrhizal fungi in the Mountain Chaco Forest Longo, Maria Silvana; Nouhra, Eduardo Ramon; Goto, Bruno; Berbara, Ricardo; Urcelay, Roberto Carlos The aim of this study was to evaluate the fire effects on the AMF spore communities and soil chemical properties as well as the existence of possible correlations between them in the Chaco Serrano Forests of central Argentina. Our hypothesis is that the fire has a negative impact on the community of AMF spores (i.e. density, diversity, richness and evenness) and soil chemical properties. In addition, we expect to find a high correlation between changes in the communities of fungi and soil chemical properties. We selected five areas in the 'Sierras Pampeanas' mountain ranges within the Chaquean region in central Argentina. In each of them we selected adjacent burned and unburned forest sites. Burned sites have all the same time since fire occurrence (August-November 2009) and soil samples were collected in autumn (April) and spring (November) in 2010. The fire events had direct negative effects on AMF spore communities. Evenness, and notably diversity and richness of AMF spores decreased in the burned sites. Density of AMF spores was not affected by fire. With the exception of C:N, nitrate and electrical conduc- tivity, soil parameters showed significant differences between burned and unburned sites. The changes in AMF spore composition were not significantly correlated with most of the soil variables measured here. The results of this study suggest that fire occurrence negatively affect AMF communities. These effects do not seem to be mediated by changes in soil abiotic properties. Rather, they suggest direct effects of fire on soil fungi.

Measurements of Four-Lepton Production at the Z Resonance in pp Collisions at s√=7 and 8 TeV with Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Otero y Garzon, Gustavo Javier; Piegaia, Ricardo Nestor; Sacerdoti, Sabrina; Reisin, Hernan Diego; Romeo, Gaston Leonardo; Alconada Verzini, María Josefina; Alonso, Francisco; Anduaga, Xabier Sebastian; Dova, Maria Teresa; Monticelli, Fernando Gabriel; Zhukov, K.; Zibell, A.; Zieminska, D.; Zimine, N. I.; Zimmermann, C.; Zimmermann, R.; Zimmermann, S.; Zimmermann, S.; Ziolkowski, M.; Zobernig, G.; Zoccoli, A.; Nedden, M. zur; Zurzolo, G.; Zutshi, V.; Zwalinski, L.; The ATLAS Collaboration Measurements of four-lepton (4ℓ, ℓ=e,μ) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions mℓ+ℓ->5  GeV and 80

Variaciones sanguíneas y corporales en bucerros nacidos en establecimientos ganaderos de Chaco y Corrientes, Argentina; Hematic and corporal variations in juvenile buffalos born in farms from Chaco and Corrientes, Argentina Koza, Gabriela Alejandra; Mussart, Norma Beatriz; Konrad, José Luis; Hernando, Josefina; Coppo, José Antonio La explotación de búfalos es una actividad en constante desarrollo en Argentina. El objetivo del ensayo fue determinar intervalos hemáticos de referencia en ejemplares juveniles (edad: 8-12 meses) criados en distintas zonas del nordeste del país. En enero de 2013 se evaluaron 30 machos de raza Mediterránea pertenecientes a dos establecimientos situados en los departamentos de Itatí (E1, n=10) y Empedrado (E2, n=10) en la Provincia de Corrientes y uno en San Fernando (E3, n=10), en la Provincia de Chaco, todos en buen estado de salud. Se registró el peso vivo (PV) y el perímetro torácico (PT), realizándose análisis hematológicos y bioquímicos. Los datos se procesaron bajo un diseño en bloques completos al azar, efectuándose estadísticas descriptivas y análisis de la varianza a una vía (p<0,05). PV resultó más elevado en E1 y E2 con relación a E3. PT fue superior en E1. Eritrocitos, hematocrito y hemoglobina fueron más altos en E1 y E2. Los leucocitos resultaron más elevados en E1 y E3. Proteínas totales, albúminas, colesterol, triglicéridos, C-HDL y C-LDL revelaron niveles más altos en E3, en tanto que E1 registró los mayores niveles de urea, calcio, magnesio y glucosa. En cambio, fructosamina no reveló diferencias significativas entre grupos. Las actividades más altas de las enzimas ALP, GGT y AST se constataron en E3, pero LDH fue mayor en E1. Las diferencias deberían atribuirse a la zona geográfica (clima, pasturas) y quizás a los sistemas de manejo de cada establecimiento. Se espera que los intervalos de referencia aquí obtenidos asuman utilidad para el diagnóstico de enfermedades y la valoración del estado nutricional de machos bubalinos en estadio juvenil de la raza Mediterránea en el nordeste argentino.; The breeding of buffalos is an activity in constant development in Argentina. The objective of this assay was to determine blood reference intervals in juvenile buffalos (age: 8-12 months) maintained in different areas of the northeast region of Argentina. In January 2013, thirty healthy male Mediterranean buffalos from two farms located in the departments of Itati (E1, n=10) and Empedrado (E2, n=10) from Corrientes Province and one in San Fernando (E3, n=10 from Chaco Province, were evaluated. Liveweight (PV) and thoracic perimeter (PT), as well as different hematological and biochemical parameters, were registered. Data were processed by a complete randomized block design using descriptive statistics and one-way analysis of variance (p<0.05). PV was higher in E1 and E2 compared to E3. PT was higher in E1. Red blood cells, packed cell volume and hemoglobin concentration were higher in E1 and E2. Total leukocytes were higher in E1 and E3. Total protein, albumin, cholesterol, triglycerides, HDL-C and LDL-C revealed higher levels in E3, whereas E1 registered the highest urea, calcium, magnesium and glucose levels. On the other hand, fructosamine did not reveal significant differences among groups. The highest enzymatic activities of ALP, GGT and AST were verified in E3, but LDH was increased in E1. Such differences should be attributed to the geographical area conditions (climate, pastures) and perhaps to the handling systems of each farm. The reference intervals obtained in this work may be useful for the diagnosis of diseases and the evaluation of the nutritional state from Mediterranean juvenile male buffalos from Northeastern Argentina.