Restablecimiento de un canino tras mordedura de serpiente “yarará” (Bothrops sp.) en Corrientes, Argentina

Se describen los síntomas y lesiones registradas en un perro mordido por una serpiente del genero Bothrops (“yarará”), en una zona rural cercana a la ciudad de Corrientes, Argentina. El veneno de esta víbora posee proteasas y fosfolipasas que inducen daño local (hemorragia, edema, necrosis), así como hemorragia sistémica por acción de hemorraginas y metaloproteinasas (lesión de paredes capilares), agravada por la incoagulabilidad generada por enzimas semejantes a la trombina, que consumen el fibrinógeno sanguíneo. El canino reveló hemorragia a través de dos orificios contiguos en una mejilla, la cual estaba dolorida, caliente y edematosa. No se registraron signos de hemorragia sistémica. Se administró suero antiofídico bivalente anti-Bothrops y dexametasona, acompañados de fluidoterapia para proteger a los riñones. El tiempo de coagulación activado se mantuvoprolongado hasta las 6 h, normalizándose a las 8 h de iniciado el tratamiento. Se postula que la precocidad de la intervención y el buen estado físico del animal fueron cruciales para su completa recuperación

Efecto de diferentes tipos de cosecha sobre la calidad tecnológica de la fibra de algodón en cultivos de alta densidad

Desde la introducción en la Argentina de los sistemas de producción de algodón en surcos estrechos la superficie de cosecha con plataformas recolectoras de tipo stripper ha aumentado y se han desarrollado variados sistemas. El objetivo del presente trabajo fue evaluar la calidad tecnológica de la fibra en algodones conducidos bajo sistema de surcos estrechos y recolectados bajos diferentes sistemas stripper y su comparación con el sistema picker. A partir del desmote de cada unidad experimental se individualizaron los fardos de fibras producidos y se analizaron por (HVI), obteniéndose valores de Longitud, Resistencia, Uniformidad, Micronaire, Elongación, y color a través de Rd y +b, con estos datos se construyeron tablas de frecuencias según los intervalos de clasificación para cada parámetro de calidad. El análisis de la distribución de frecuencias de los parámetros más significativos que determinan la calidad de la fibra de algodón permitieron detectar mínimos cambios en las distribuciones y estos no modificaron el intervalo de clase con mayor frecuencia, lo que no implicaría cambios en la calidad tecnológica de la fibra cosechada con distintos sistemas de cosecha stripper en relación con la cosecha picker. Los cambios en la distribución fueron mayores cuando el ensayo se realizó en condiciones de secano debido a un menor control de la fructificación del cultivo por lo que pone de relevancia el manejo de este en los sistemas que se cosecharan con sistemas stripper.Cotton fiber characteristics are influenced by the genetic and environmental factors, such as management, climate maturation, and significantly by harvesting conditions. The objective of this study was to analyze the variables of cotton fiber characteristics depending on the, picker, and stripper harvest systems, in narrow row cotton system. The experiments are conducted for five seasons in Argentina. The two first season in watering crop a de the tree last at rainfall. The cotton samples, taken from the stored basket of harvesters, were derived by mechanical systems harvesting. The analysis of the frequency distribution of the most significant parameters that determine the quality of the cotton fiber allowed to detect minimum changes in the distributions and these did not modify the class interval more frequently, which would not imply changes in the technological quality of the fiber harvested with different systems of harvesting stripper in relation to the picker. The changes in the distribution were greater when the test was carried out in rainfed conditions due to a lower control of the fruiting of the crop, which makes the management of the crop relevant in systems that were harvested with stripper systemsEEA Las BreñasFil: Tarrago, Jose Ramon. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Las Breñas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias; ArgentinaFil: Colli, Sergio Leonardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Las Breñas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias; ArgentinaFil: Nadal, Nelson Jose. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Las Breñas; ArgentinaFil: Gimenez, L. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias; Argentin

Monitoring methionine sulfoxide with stereospecific mechanism-based fluorescent sensors

Methionine can be reversibly oxidized to methionine sulfoxide (MetO) under physiological and pathophysiological conditions, but its use as a redox marker suffers from the lack of tools to detect and quantify MetO within cells. In this work, we created a pair of complementary stereospecific genetically-encoded mechanism-based ratiometric fluorescent sensors of MetO by inserting a circularly yellow fluorescent protein between yeast methionine sulfoxide reductases and thioredoxins. The two sensors, named MetSOx and MetROx for their ability to detect S and R-forms of MetO, respectively, were utilized for targeted analysis of protein oxidation, regulation and repair, as well as for monitoring MetO in bacterial and mammalian cells, analyzing compartment-specific changes in MetO, and examining responses to physiological stimuli

Caracterización de genotipos de Gossypium hirsutum L. sobre su tolerancia a estrés hídrico

El déficit hídrico y la alta demanda atmosférica en climas subhúmedos limita la productividad de los cultivos, la selección de variedades tolerantes es una estrategia para minimizar el impacto. El objetivo fue caracterizar 20 genotipos de Gossypium hirsutum L. pertenecientes al banco de germoplasma de INTA EEA Sáenz Peña por su tolerancia al estrés hídrico mediante variables fisiológicas. El ensayo se realizó bajo condiciones controladas en la Estación Experimental Agropecuaria (EEA) INTA Las Breñas durante el año 2014. Se utilizó un diseño experimental bifactorial; el factor A fue la presencia o ausencia de estrés (se suspendió la oferta de agua a partir de la tercera hoja verdadera y 50% de CC por seis días) y el factor B fueron 20 genotipos de algodón. Se midieron conductancia estomática (Ce, mmol/m-2/s-1), temperatura foliar (T, ºC) y contenido de agua relativo (CAR, %). Por un lado, los resultados del análisis univariado mostraron interacción significativa entre el efecto del tratamiento y los genotipos, tanto para Ce como para CAR. En T solo se observó diferencia entre los genotipos. Por otro lado, las diferencias genéticas en las variables fisiológicas fueron bajas debido a un fuerte efecto ambiental causado por las condiciones de estrés, que enmascararon la variancia genética. Las variables analizadas en conjunto en el análisis de componentes principales pudieron separar a los tratamientos significativamente y clasificar a los genotipos en tres grupos contrastantes. Los genotipos con mejor comportamiento frente al estrés hídrico en relación con el CAR y la Ce conjuntamente fueron BGSP 756, BGSP 463, BGSP 804, BGSP 735, BGSP 803, BGSP 514, BGSP 67, BGSP 475, BGSP 507 y SP 48114.Water deficit and high atmospheric demand in subhumid climates limit the productivity of crops, being the selection of tolerant varieties a strategy to minimize their impact. The objective was to characterize 20 genotypes of Gossypium hirsutum L. belonging to the germplasm bank of INTA EEA Sáenz Peña for their tolerance to water stress by means of physiological variables. The trial was carried out under controlled conditions in the EEA INTA Las Breñas during the year 2014. A bifactorial experimental design was used, being the factor A the presence or absence of stress (water supply was suspended from the third true leaf and 50% FC for six days), and factor B 20 cotton genotypes. Stomatal conductance (Sc, mmol / m-2 / s-1), leaf temperature (T, °C) and relative water content (RWC, %) were measured. The results of the univariate analysis showed a significant interaction between the factors treatment and genotype for Sc and RWC. For T, only difference between genotypes was observed. On the other hand, the genetic differences in the physiological variables were low due to a strong environmental effect caused by the stress conditions, which masked the genetic variance. The variables analyzed together by a main component analysis were able to separate the treatments significantly and classified the genotypes into three contrasting groups. The genotypes with the best behavior against water stress in relation to RWC and Sc together were BGSP 756, BGSP 463, BGSP 804, BGSP 735, BGSP 803, BGSP 514, BGSP 67, BGSP 475, BGSP 507 y SP 48114.EEA Sáenz PeñaFil: Spoljaric, Mónica. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Sáenz Peña; ArgentinaFil: Tcach, Mauricio Alfredo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Sáenz Peña; ArgentinaFil: Rojas, Julieta Mariana. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Sáenz Peña; ArgentinaFil: Tarrago, Jose Ramon. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Las Breñas; ArgentinaFil: Cointry, E.L. Universidad Nacional de Rosario, Facultad de Ciencias Agrarias; Argentin

J/psi azimuthal anisotropy relative to the reaction plane in Pb-Pb collisions at 158 GeV per nucleon

The J/$\psi$ azimuthal distribution relative to the reaction plane has been measured by the NA50 experiment in Pb-Pb collisions at 158 GeV/nucleon. Various physical mechanisms related to charmonium dissociation in the medium created in the heavy ion collision are expected to introduce an anisotropy in the azimuthal distribution of the observed J/$\psi$ mesons at SPS energies. Hence, the measurement of J/$\psi$ elliptic anisotropy, quantified by the Fourier coefficient v$_2$ of the J/$\psi$ azimuthal distribution relative to the reaction plane, is an important tool to constrain theoretical models aimed at explaining the anomalous J/$\psi$ suppression observed in Pb-Pb collisions. We present the measured J/$\psi$ yields in different bins of azimuthal angle relative to the reaction plane, as well as the resulting values of the Fourier coefficient v$_{2}$ as a function of the collision centrality and of the J/$\psi$ transverse momentum. The reaction plane has been estimated from the azimuthal distribution of the neutral transverse energy detected in an electromagnetic calorimeter. The analysis has been performed on a data sample of about 100 000 events, distributed in five centrality or p$_{\rm T}$ sub-samples. The extracted v$_{2}$ values are significantly larger than zero for non-central collisions and are seen to increase with p$_{\rm T}$.Comment: proceedings of HP08 conference corrected a typo in one equatio

A new measurement of J/psi suppression in Pb-Pb collisions at 158 GeV per nucleon

We present a new measurement of J/psi production in Pb-Pb collisions at 158 GeV/nucleon, from the data sample collected in year 2000 by the NA50 Collaboration, under improved experimental conditions with respect to previous years. With the target system placed in vacuum, the setup was better adapted to study, in particular, the most peripheral nuclear collisions with unprecedented accuracy. The analysis of this data sample shows that the (J/psi)/Drell-Yan cross-sections ratio measured in the most peripheral Pb-Pb interactions is in good agreement with the nuclear absorption pattern extrapolated from the studies of proton-nucleus collisions. Furthermore, this new measurement confirms our previous observation that the (J/psi)/Drell-Yan cross-sections ratio departs from the normal nuclear absorption pattern for semi-central Pb-Pb collisions and that this ratio persistently decreases up to the most central collisions.Comment: 19 pages, 10 figures. Submitted to Eur. Phys. J.

The dependence of the anomalous J/psi suppression on the number of participant nucleons

The observation of an anomalous J/psi suppression in Pb-Pb collisions by the NA50 Collaboration can be considered as the most striking indication for the deconfinement of quarks and gluons at SPS energies. In this Letter, we determine the J/psi suppression pattern as a function of the forward hadronic energy E-ZDC measured in a Zero Degree Calorimeter (ZDC). The direct connection between EZDC and the geometry of the collision allows us to calculate, within a Glauber approach, the precise relation between the number of participant nucleons N-part and E-ZDC. Then, we check if the experimental data can be better explained by a sudden or a smooth onset of the anomalous J/psi suppression as a function of the number of participants. (C) 2001 Elsevier Science B.V. All rights reserved.info:eu-repo/semantics/publishedVersio

Bottomonium and Drell-Yan production in p-A collisions at 450 GeV

The NA50 Collaboration has measured heavy-quarkonium production in p-A collisions at 450 GeV incident energy (sqrt(s) = 29.1 GeV). We report here results on the production of the Upsilon states and of high-mass Drell-Yan muon pairs (m > 6 GeV). The cross-section at midrapidity and the A-dependence of the measured yields are determined and compared with the results of other fixed-target experiments and with the available theoretical estimates. Finally, we also address some issues concerning the transverse momentum distributions of the measured dimuons.Comment: 18 pages, 9 figures, to be published in Phys. Lett.

Centrality Behaviour of J/ψ\psi Production in Na50

The J/$\psi$ production in 158 A GeV Pb-Pb interactions is studied, in the dimuon decay channel, as a function of centrality, as measured with the electromagnetic or with the very forward calorimeters. After a first sharp variation at mid centrality, both patterns continue to fall down and exhibit a curvature change at high centrality values. This trend excludes any conventional hadronic model and is in agreement with a deconfined quark-gluon phase scenario. We report also preliminary results on the measured charged multiplicity, as given by a dedicated detector.Comment: 5 pages, 7 figures (in eps) talk given at XXXI International Symposium on Multiparticle Dynamics, Sep. 1-7, 2001, Datong China URL http://ismd31.ccnu.edu.cn

Charmonia production in 450 GeV/c proton-induced reactions

Absolute \jpsi\ and \psip\ production cross sections have been measured at the CERN SPS, with 450~GeV/$c$ protons incident on a set of C, Al, Cu and W targets. Complementing these values with the results obtained by experiment NA51, which used the same beam and detector with H and D targets, we establish a coherent picture of charmonia production in proton-induced reactions at SPS energies. In particular, we show that the scaling of the \jpsi\ cross section with the mass number of the target, A, is well described as A$^\alpha$ with $\alpha^\psi=0.919\pm0.015$. The ratio between the \jpsi\ and \psip\ yields, in our kinematical window, is found to be independent of A, with $\alpha^{\psi^\prime}-\alpha^{\psi}=0.014\pm0.0 11$