Single point mutations in the helicase domain of the NS3 protein enhance dengue virus replicative capacity in human monocyte-derived dendritic cells and circumvent the type I interferon response Silveira, G. F.; Strottmann, D. M.; de Borba, Luana; Mansur, D. S.; Zanchin, N. I. T.; Bordignon, J.; Duarte dos Santos, C.N. Dengue is the most prevalent arboviral disease worldwide. The outcome of the infection is determined by the interplay of viral and host factors. In the present study, we evaluated the cellular response of human monocyte-derived DCs (mdDCs) infected with recombinant dengue virus type 1 (DV1) strains carrying a single point mutation in the NS3hel protein (L435S or L480S). Both mutated viruses infect and replicate more efficiently and produce more viral progeny in infected mdDCs compared with the parental, non-mutated virus (vBACDV1). Additionally, global gene expression analysis using cDNA microarrays revealed that the mutated DVs induce the up-regulation of the interferon (IFN) signalling and pattern recognition receptor (PRR) canonical pathways in mdDCs. Pronounced production of type I IFN were detected specifically in mdDCs infected with DV1-NS3hel-mutated virus compared with mdDCs infected with the parental virus. In addition, we showed that the type I IFN produced by mdDCs is able to reduce DV1 infection rates, suggesting that cytokine function is effective but not sufficient to mediate viral clearance of DV1-NS3hel-mutated strains. Our results demonstrate that single point mutations in subdomain 2 have important implications for adenosine triphosphatase (ATPase) activity of DV1-NS3hel. Although a direct functional connection between the increased ATPase activity and viral replication still requires further studies, these mutations speed up viral RNA replication and are sufficient to enhance viral replicative capacity in human primary cell infection and circumvent type I IFN activity. This information may have particular relevance for attenuated vaccine protocols designed for DV.

Evolution of the Chos Malal and Agrio fold and thrust belts, Andes of Neuquén: insights from structural analysis and apatite fission track dating Rojas Vera, Emilio Agustin; Mescua, Jose Francisco; Folguera Telichevsky, Andres; Becker, T. P.; Sagripanti, Lucía; Fennell, Lucas Martín; Orts, Darío Leandro; Ramos, Victor Alberto The Chos Malal and Agrio fold and thrust belts are located in the western part of the Neuquén basin, an Andean retroarc basin of central-western Argentina. Both belts show evidence of tectonic inversion at the western part during Late Cretaceous times. The eastern part is dominated by late Miocene deformation which also partially reactivated the western structures. This work focuses on the study of the regional structure and the deformational event that shaped the relief of this part of the Andes. Based on new field work and structural data and previously published works a detailed map of the central part of the Neuquén basin is presented. Three regional structural cross sections were surveyed and balanced using the 2d Move™ software. In order to define a more accurate uplift history, new apatite fission track analyses were carried on selected structures. These data was used for new thermal history modeling of the inner part of the Agrio and Chos Malal fold and thrust belts. The results of the fission track analyses improve the knowledge of how these fold and thrust belts have grown trough time. Two main deformational events are defined in Late Cretaceous to Paleocene and Late Miocene times. Based on this regional structural analysis and the fission track data the precise location of the orogenic front for the Late Cretaceous-Paleocene times is reconstructed and it is proposed a structural evolution of this segment of the Andes. This new exhumation data show how the Late Cretaceous to Paleocene event was a continuous and uninterrupted deformational event.

Effects of Saturn's magnetospheric dynamics on Titan's ionosphere Edberg, N. J. T.; Andrews, D. J.; Bertucci, Cesar; Gurnett, D. A.; Holmberg, M. K. G.; Jackman, C. M.; Kurth, W. S.; Menietti, J. D.; Opgenoorth, H. J.; Shebanits, O.; Vigren, E.; Wahlund, J. E. We use the Cassini Radio and Plasma Wave Science/Langmuir probe measurements of the electron density from the first 110 flybys of Titan to study how Saturn´s magnetosphere influences Titan´s ionosphere. The data is first corrected for biased sampling due to varying solar zenith angle and solar energy flux (solar cycle effects). We then present results showing that the electron density in Titan´s ionosphere, in the altitude range 1600-2400 km, is increased by about a factor of 2.5 when Titan is located on the nightside of Saturn (Saturn local time (SLT) 21-03 h) compared to when on the dayside (SLT 09-15 h). For lower altitudes (1100-1600 km) the main dividing factor for the ionospheric density is the ambient magnetospheric conditions. When Titan is located in the magnetospheric current sheet, the electron density in Titan´s ionosphere is about a factor of 1.4 higher compared to when Titan is located in the magnetospheric lobes. The factor of 1.4 increase in between sheet and lobe flybys is interpreted as an effect of increased particle impact ionization from 200 eV sheet electrons. The factor of 2.5 increase in electron density between flybys on Saturn´s nightside and dayside is suggested to be an effect of the pressure balance between thermal plus magnetic pressure in Titan´s ionosphere against the dynamic pressure and energetic particle pressure in Saturn´s magnetosphere.

Evaluación de un curso de formación docente continua sobre TIC: una propuesta destinada a profesores universitarios de carreras científicas y tecnológicas; Evaluation of a course of continuous teacher training related to Ict: a proposal for faculty members of science and technology careers Garcia, Leticia; Occelli, Maricel; Quse, Ligia del Carmen Maria; Masullo, Marina; Biber, Priscila El trabajo presenta una investigación acerca de una experiencia de formación docente continua sobre TIC en la cual participaron 24 profesores universitarios de ciencia y tecnología de la ciudad de Córdoba, Argentina. La propuesta se centró en fundamentos tecnológicos, pedagógicodidácticos y contextuales y tuvo tres ejes conceptuales, la comunicación, el trabajo colaborativo y la evaluación en ambientes virtuales de aprendizaje. Los profesores participantes analizaron las fortalezas y debilidades de sus aulas virtuales y diseñaron contenidos y actividades a través del trabajo conjunto entre pares y expertos. Los resultados indican que los docentes parten de prácticas tradicionales de enseñanza y luego de la instancia de formación logran mejorar diversos aspectos de sus aulas virtuales, especialmente en lo que respecta a la evaluación continua de los aprendizajes.

Susceptibility to β-lactams and quinolones of Enterobacteriaceae isolated from urinary tract infections in outpatients Marchisio, Martín; Porto, Ayelen Patricia; Joris, Romina; Rico, Marina; Baroni, María R.; Di Conza, José Alejandro The antibiotic susceptibility profile was evaluated in 71 Enterobacteriaceae isolates obtained from outpatient urine cultures in July 2010 from two health institutions in Santa Fe, Argentina. The highest rates of antibiotic resistance were observed for ampicillin (AMP) (69%), trimethoprim/sulfamethoxazole (TMS) (33%), and ciprofloxacin (CIP) (25%). Meanwhile, 21% of the isolates were resistant to three or more tested antibiotics families. Thirty integron-containing bacteria (42.3%) were detected, and a strong association with TMS resistance was found. Third generation cephalosporin resistance was detected in only one Escherichia coli isolate, and it was characterized as a blaCMY-2 carrier. No plasmid-mediated quinolone resistance (PMQR) was found. Resistance to fluoroquinolone in the isolates was due to alterations in QRDR regions. Two mutations in GyrA (S83L, D87N) and one in ParC (S80I) were observed in all CIP-resistant E. coli. It was determined to be the main phylogenetic groups in E. coli isolates. Minimum Inhibitory Concentration (MIC) values against nalidixic acid (NAL), levofloxacin (LEV), and CIP were determined for 63 uropathogenic E. coli isolates as MIC50 of 4 μg/mL, 0.03125 μg/mL, and 0.03125 μg/mL, respectively, while the MIC90 values of the antibiotics were determined as 1024 μg/mL, 64 μg/mL, and 16 μg/mL, respectively. An association between the phylogenetic groups, A and B1 with fluoroquinolone resistance was observed. These results point to the importance of awareness of the potential risk associated with empirical treatment with both the families of antibiotics.

Absolute configuration assignment of an unusual homoisoflavanone from Polygonum ferrugineum using a combination of chiroptical methods Batista Jr., João Marcos; Wang, Bo; Castelli, Maria Victoria; Blanch, Ewan W.; López, Silvia Noelí The absolute configuration of the homoisoflavanone 5,7-dihydroxy-6-methoxy-3-(9-hydroxy-phenylmethyl)-chroman-4-one (1), found in Polygonum species, has been determined as 3R,9R by using a combination of electronic and vibrational chiroptical spectroscopic methods. The experimental spectra were interpreted with the aid of density functional theory calculations. The risks of relying upon a single method for stereochemical characterization of natural products are discussed.

Germinación y emergencia de Megathyrsus Maximus Var.Maximus; Germination and Emergence of Megathyrsus maximus var. maximus Cabrera, Debora Carina; Sobrero, M. T.; Chaila, S.; Pece, M. Se estudió la germinación de semillas de Megathyrsus maximus al exponerlas a altas temperaturas y el efecto de diferentes profundidades de siembra y cantidades de residuos de cosecha en la emergencia de las plántulas. En laboratorio, se determinó la germinación y biomasa de semillas con y sin glumas y glumelas, expuestas a 0, 40, 60, 80 y 100 oC durante cinco minutos. Se realizaron dos experimentos en invernáculo para evaluar la emergencia de la maleza, primero a diferentes profundidades de siembra: 0, 0.5, 1, 2, 3, 4, 5, 7 y 8 cm. Posteriormente, se evaluó emergencia con diferentes cantidades de residuos de cosecha: 0, 5, 8, 11, 13, 15 y 18 t ha-1. Los resultados de los ensayos de temperatura se analizaron mediante análisis de covarianza y los datos de los ensayos de invernáculo mediante regresión. Los máximos porcentajes de germinación para semillas con y sin glumas y glumelas se obtuvieron a 40 oC y fueron del 35 y 48%, respectivamente; los mínimos valores se registraron a los 80 oC y fueron del 7 y 28%, respectivamente. La profundidad de siembra afectó la emergencia: un 51% se registró en el testigo, valor que disminuyó al 23,3% a los 7 cm y a 0% a los 8 cm. Los residuos de cosecha también afectaron la emergencia: con 0 a 18 t ha-1, esta disminuyó del 64,8 al 0%. Puede concluirse que las estrategias implementadas en el manejo del cultivo de caña de azúcar afectarán la germinación y emergencia de M. maximus.; This work aimed to study the germination of Megathyrsus maximus seeds when exposed to high temperatures, as well as to evaluate the effects of different seed planting depths and sugarcane crop residue amounts on weed emergence. In the laboratory, germination and biomass of seeds with and without glumes were determined when exposed to 0, 40, 60, 80 and 100 oC, for five minutes. Two experiments were performed in the greenhouse to assess the emergence rate in relation to different weed seed planting depths (0, 0.5, 1, 2, 3, 4, 5, 7 and 8 cm) on the one hand, and in relation to different sugarcane crop residue quantities (0.5, 8, 11, 13, 15 and 18 t ha-1) on the other. Temperature tests were analyzed by means of covariance analysis, whereas greenhouse tests were analyzed with regression. The highest germination percentages for seeds with and without glumes were 48 and 35%, respectively, and they were obtained at 40 oC. The lowest values were 28 and 7% for seeds with and without glumes, respectively, and they were obtained at 80 oC. Seed planting depth had a negative effect on weed emergence: the control led to 51% emergence, which dropped to 23.3% at 7 cm and eventually to zero at 8.0 cm. Crop residues had a negative effect on emergence as well: when residue quantities ranged from 0 to 18 t ha-1, emergence decreased from 64.8 to 0%.Thus we can conclude that sugarcane management strategies affect M. maximus germination and emergence.

Assessment of alternative sources of seaweed polysaccharides in Argentina: potentials of the agarophyte Gelidium crinale (Hare ex Turner) Gaillon (Rhodophyta, Gelidiales) Croce, Maria Emilia; Villar, Marcelo Armando; Parodi, Elisa Rosalia The phycocolloids industry in Argentina has been based on the importation of non-native species and the exploitation of natural populations of Gracilaria, which are currently declining. This study was carried out to evaluate the potential of Gelidium crinale as an unexploited source of agar in this country. The yield and composition of polysaccharides extracted from G. crinale, as well as the growth potential of this species were studied. In vitro cultures of apical sections were carried out; relative growth rates (RGR) and data were analyzed through repeated measurements. Explants rapidly duplicated their initial size, producing numerous proliferations and achieving structural complexity. RGR of explants, primary proliferations, and secondary proliferations were high and similar. Polysaccharide extraction was done under three conditions: acid pre-extraction treatment + pressure boiled (AP), water pre-extraction treatment + pressure boiled (WP), and water pre-extraction treatment + boiled (WB). Polysaccharides were characterized through infrared spectroscopy, X-ray fluorescence, thermogravimetric, and elemental analysis. Polysaccharides obtained corresponded to the agar-type, and showed high similarity to commercial agar samples, with low sulfate and methyl contents. Higher yields were obtained with pressure extractions; however, acid treatment did not increase the amount of extracted biopolymers. Their degradation occurred in the range 250–400 °C. Polysaccharides obtained under AP conditions had a degradation curve similar to food-grade agar-agar, whereas degradation curves of polysaccharides obtained without acid treatment were similar to biotechnology-grade agar-agar. According to the results, G. crinale from Anegada Bay produces a high-quality agar to be considered for the Argentinean agar industry; however, micropropagation techniques would be indispensable to increase its bioavailability.

Cultural patterns of firewood use as a tool for conservation: a study of multiple perceptions in a semiarid region of Cordoba Martinez, Gustavo Javier The paper analyzes local perceptions and practices related to the quality, extraction, and use of fuels firewood by the inhabitants of two protected areas. Our working model assumes the existence of patterns of preference, use and acquisition of firewood, depending on the social actors involved, and their perceptions. Our research developed through: the making of a reference collection and the applicationand of in-depth interviews and semi-structured surveys. We identified the most frequently used species and those with the greatest number of uses. The presence of patterns in the provisioning of energy source, and of firewood gathering and use, were identified in different actors. Through the application of a PCA analysis, and the study of native categories, patterning in the grouping of species was established, according to the local firewood classification. The latter relate to differences in the ease of ignition, in the durability and temperature of the flame and/or embers and the amount and type of smoke or ash produced. On the basis of ecological and perceptual information, a ranking of local priorities for the conservation of woody species is proposed. Finally, we discuss the relevance of sociocultural patterns of local perceptions of firewood use for conservation.

La vejez como problema histórico: Una agenda de investigación Otero, Hernan Gustavo La historia de la vejez se ha constituido desde los años ochenta como un campo de indagación relevante, tanto por el creciente interés de su objeto de estudio en la agenda pública como por ubicarse en la encrucijada de la demografía histórica, la historia de la población y la historia social en general. Partiendo de esta constatación, el texto analiza, en primer lugar, las múltiples dificultades teóricas y metodológicas del estudio histórico de ese colectivo etario. En segundo término, recorre la principal producción historiográfica existente con el fin de proponer una agenda de investigación, atenta a las fuentes y problemas específicos del caso argentino.; The history of old age has become a field of relevant research since the eighties, both by the growing interest of its subject matter on the public agenda and by its location at the crossroads of historical demography, population history, and social history in the main. With this in mind, the text analyzes firstly the multiple theoretical and methodological difficulties of historical study of that age group. Secondly, it scours the main existing historiographical production in order to propose a research agenda, mindful of the sources and specific problems of the Argentine case.

Ingresar al "Estado". Marco decisional, actores e intereses en los procesos de ingreso de personal en la Administración Pública correntina Ojeda, Valeria Patricia Este artículo reúne parte de los resultados de una tesis doctoral recientemente defendida para el Doctorado en Ciencias Sociales de la Universidad Nacional de Cuyo, denominada ?Configuración de intereses en la Gestión de la Fuerza de Trabajo. Implicancias políticas e institucionales en la Administración Pública de Corrientes (1983-2012)?. El problema que aquí abordamos se circunscribe a las características que reúne el proceso de ingreso al empleo público, cuando el marco institucional para esta función se encuentra desactivado. Nuestro objetivo es entonces reconstruir la configuración del proceso de ingreso y conocer algunas de las estrategias que desarrollan los actores (trabajadores estatales-línea de decisión política) a fin de cumplimentar sus intereses. Asimismo revisar cómo se articulan las decisiones en torno a tales estrategias. Para la reconstrucción de estas formas y maneras de acceder al empleo (o de obtener personal) trabajamos a partir de entrevistas en profundidad realizadas a agentes estatales (mandos medios con responsabilidades de gestión de personal) de tres ministerios de la Administración Pública Provincial del nivel central, seleccionados a partir de un muestreo intencional. El tamaño de la muestra fue definido a través del criterio de saturación teórica. Recordemos que el marco institucional que regula el ingreso al Estado provincial correntino se encuentra previsto en la Ley 4067, Ley de Servicio Civil de la Provincia. Esta ley, sancionada en 1986 durante el gobierno de José Antonio Romero Feris, considera de manera amplia los derechos y obligaciones tanto de los trabajadores como del Estado en su rol patronal: define también la naturaleza de las relaciones de trabajo establecidas, un sistema escalafonario, los procesos relativos a la movilidad (carrera) de los trabajadores, un régimen de licencias y franquicias, como aspectos más sobresalientes. Sin embargo, como hemos podido comprobar en la tesis doctoral, gran parte del articulado de la Ley 4067 se encuentra discutido. Ya sea por ausencia de reglamentación, por solapamiento con otras leyes laborales provinciales (por ejemplo con la Ley de Sueldos y Remuneraciones 3801), o simplemente por desatención o incumplimiento, el sistema de concurso se encuentra desactivado. Esta inhabilitación responde a una serie de decisiones a nivel gubernamental, que se fueron replicando a lo largo de los casi 30 años que abordó nuestro trabajo. Es decir: los diferentes gobiernos consideraron que el acceso al empleo de los trabajadores se realice por fuera del sistema de concursos establecido por la Ley 4067 (excepto en tres ocasiones). Tenemos por lo tanto diversos agentes que conocen las oportunidades que le brinda la configuración del proceso de ingreso, y que, en función de las mismas, activarán estrategias para lograr objetivos de su interés. Pero estos objetivos no serán iguales para todos ellos: se modificará en función del rol que cumplan. De esta forma se entretejerá una trama de intereses que calificará no solo la función de empleo sino también el resto de las funciones de GFT.

Functional nicotinic acetylcholine receptor reconstitution in Au(111)-supported Thiolipid Monolayers Pissinis, Diego Ezequiel; Diaz, Carolina; Maza, Eliana María; Bonini, Ida Clara; Barrantes, Francisco Jose; Salvarezza, Roberto Carlos; Schilardi, Patricia Laura The insertion and function of the muscle-type nicotinic acetylcholine receptor (nAChR) in Au(111)- supported thiolipid self-assembled monolayers have been studied by atomic force microscopy (AFM), surface plasmon resonance (SPR), and electrochemical techniques. It was possible for the first time to resolve the supramolecular arrangement of the protein spontaneously inserted in a thiolipid monolayer in an aqueous solution. Geometric supramolecular arrays of nAChRs were observed, most commonly in a triangular form compatible with three nAChR dimers of ∼20 nm each. Addition of the full agonist carbamoylcholine activated and opened the nAChR ion channel, as revealed by the increase in capacitance relative to that of the nAChR?thiolipid system under basal conditions. Thus, the self-assembled system appears to be a viable biomimetic model to measure ionic conductance mediated by ion-gated ion channels under different experimental conditions, with potential applications in biotechnology and pharmacology

Structure factor determination of deuterated 1- and 2-propanol using diffraction experiments with polarization analysis Rodriguez Palomino, Luis Alberto; Cuello, Gabriel Julio; Stunault, A.; Dawidowski, Javier We present the experimental structure factors of deuterated 1- and 2-propanol as determined at the Spin Polarized Hot Neutron Beam Facility (D3) of the Institut Laue Langevin. Polarized neutron scattering with polarization analysis has the advantage of experimentally separating the coherent and incoherent scattering intensities. Using a linear combination of non-spin-flip and spin-flip diffractograms, one can determine the coherent intensity, related to the structure factor. The corrections of experimental data for multiple scattering, attenuation and inelasticity are carried out using a Monte Carlo (MC) simulation code developed for this kind of experiments. This (hybrid) MC method is based on the combination of a modelled energy exchange and the experimental angular distribution. The good agreement observed between our simulations and the experimental results, confirms the goodness of this model. We also compare our results with experimental data from other authors and we stress the need of more experimental data in the low- region.

Radio emission from Supernova Remnants Dubner, Gloria Mabel; Giacani, Elsa Beatriz The explosion of a supernova releases almost instantaneously about 10^51ergs of mechanic energy, changing irreversibly the physical and chemical proper- ties of large regions in the galaxies. The stellar ejecta, the nebula resulting from the powerful shock waves, and sometimes a compact stellar remnant, constitute a super- nova remnant (SNR). They can radiate their energy across the whole electromagnetic spectrum, but the great majority are radio sources. Almost 70 years after the first detection of radio emission coming from a SNR, great progress has been achieved in the comprehension of their physical characteristics and evolution. We review the present knowledge of different aspects of radio remnants, focusing on sources of the Milky Way and the Magellanic Clouds, where the SNRs can be spatially resolved. We present a brief overview of theoretical background, analyze morphology and polariza- tion properties, and review and critical discuss different methods applied to determine the radio spectrum and distances. The consequences of the interaction between the SNR shocks and the surrounding medium are examined, including the question of whether SNRs can trigger the formation of new stars. Cases of multispectral com- parison are presented. A section is devoted to reviewing recent results of radio SNRs in the Magellanic Clouds, with particular emphasis on the radio properties of SN 1987A, an ideal laboratory to investigate dynamical evolution of an SNR in near real time. The review concludes with a summary of issues on radio SNRs that deserve further study, and analyzing the prospects for future research with the latest generation radio telescopes.

Chrysobrycon guahibo, a new species from the Orinoco River basin, with a distribution expansion of the genus (Teleostei: Characidae); Chrysobrycon guahibo, nueva especie, se describe para algunos pequeños drenajes que fluyen hacia la cuenca del río Guaviare, cuenca del río Orinoco, Colombia Vanegas Rios, James Anyelo; Bonilla Urbano, Alexander; Azpelicueta, Maria de Las M. Chrysobrycon guahibo, new species, is described from some small drainages flowing into the Guaviare River basin, Orinoco River basin, Colombia. This is the first record of the genus in the Orinoco basin. Chrysobrycon guahibo isdistinguished from all congeners by having fewer maxillary teeth 1-3 (vs. 6-15 in C. eliasi, 3-11 in C. hesperus, 3-12 in C. myersi, and 9-16 in C. yoliae), the nasal bone longer than antorbital (vs. nasal as long as or shorter thanantorbital), absence of bony lamella between the second and third basibranchials (vs. presence of this lamella), and bony hooks on the 3rd to 7th branched anal-fin rays with discontinuous arrangement, forming two separate series along each ray in mature males (vs. bony hooks with continuous arrangement, forming a single series along rays, except in C. hesperus). Chrysobrycon guahibo also differs from C. hesperus and C. myersi by the presence of a terminal lateral-line tube between caudal-fin rays 10 and 11 (vs. absence of this tube), absence of bony lamella between the first and second basibranchials (vs. presence of this lamella), and greater number of neural spines between the posteriormost supraneural and the anteriormost dorsal-fin pterygiophore (4-5 vs. 2-3). An updated identification key for all Chrysobrycon species is provided.; Chrysobrycon guahibo, nueva especie, se describe para algunos pequeños drenajes que fluyen hacia la cuenca del río Guaviare, cuenca del río Orinoco, Colombia. Este es el primer registro del género en la cuenca del Orinoco. Chrysobrycon guahibo se distingue de todos sus congéneres por poseer un menor número de dientes maxilares 1-3 (vs. 6-15 en C. eliasi, 3-11 en C. hesperus, 3-12 en C. myersi y 9-16 in C. yoliae), el nasal más largo que el antorbital (vs. nasal tan largo o más corto que el antorbital), la ausencia de lámina ósea entre el segundo y tercer basibranquiales (vs. presencia de esta lámina) y los ganchos óseos de los radios ramificados anales tercero a séptimo distribuidos de manera discontinua, formando dos series separadas a lo largo de cada radio en los machos adultos (vs. ganchos óseos distribuidos de manera continua, formando una sola serie a lo largo de los radios, excepto en C. hesperus). Chrysobrycon guahibo también difiere de C. hesperus and C. myersi por la presencia de un tubo terminal de la línea lateral entre los radios caudales 10 y 11 (vs. ausencia de este tubo), la ausencia de lámina ósea entre el primer y segundo basibranquiales (vs. presencia de esta lámina) y el mayor número de espinas neurales entre el supraneural mas posterior y el pterigióforo mas anterior de la aleta dorsal (4-5 vs. 2-3). Se presenta una clave de identificación actualizada para todas las especies de Chrysobrycon.

Hydrocarbon adsorption and NOx-SCR on (Cs,Co)mordenite Serra, Ramiro Marcelo; Aspromonte, Soledad Guadalupe; Miro, Eduardo Ernesto; Boix, Alicia Viviana In this work,anovelsolid is reported,which is active for the selective reduction of NOx with butane and toluene as reducing agents and at the same time can act as a hydrocarbon trap during the engine cold start.The active component for the catalytic reac- tion is exchanged cobalt,while the cesium promotes the adsorption capacity. Another important result is that the presence of cesiumin CsxCoM catalyst does not change the catalytic activity.Moreover, when butane is th ereducing agent,cesium increases the tempera- ture window for NOx reduction.

Catalytic ceramic papers for diesel soot oxidation: A spray method for enhanced performance Tuler, Fernando Esteban; Gaigneaux, Eric M.; Miro, Eduardo Ernesto; Milt, Viviana Guadalupe; Debecker, Damien P. A spraymethod is proposed to improve the catalytic properties of ceramic papers to be used as catalytic lters for removing diesel soot particles. Small particles of Ce and Co oxides, acting as active centers for the combustion of the soot retained by the lter, are efciently and homogeneously deposited. On the contrary, the application of the conventional dripmethod results in bigger particlesmainly agglomerated at the crossings between the bers of the ceramic paper. As a result, catalytic papers prepared by the spraymethod exhibitmuch higher performance with soot combustion temperatures decreased by ~30 °C.

Weighted a priori estimates with powers of the distance function for elliptic equations Toschi, Marisa Let u be a weak solution of the equation (-Δ)mu = f with Dirichlet boundary conditions in a smooth bounded domain Ω ⊂ ℝn. In this paper, we obtain some estimates for the Green's function associated to this problem. Moreover, under appropriate conditions on p, we prove some weighted Sobolev a priori estimates for the solution u, where the weight is a power of the distance function. This result extends previous work by R. G. Durán and M. Sanmartino ([Indiana Univ. Math. J. 57 (2008), no. 7, 3463-3478] and [Anal. Theory Appl. 26 (2010), no. 4, 339-349]).

First record of anisakis sp. (nematoda, anisakidae) l3 in the body cavity of atlantoraja platana (rajidae, chondrichthyes); Primer registro de anisakis sp. (nematoda, anisakidae) l3 en la cavidad corporal deatlantoraja platana (chondrichthyes, rajidae) Moya, Ana Carolina; Galíndez, Elena Juana; Di Giacomo, Edgardo Ernesto; Tanzola, Rubén Daniel En la presente nota se registra por primera vez el tercer estadio larval de Anisakis sp. infectando a Atlantoraja platana (Günther, 1880). Los hospederos fueron obtenidos en desembarques pesqueros de plantas de procesado de los puertos de San Antonio Oeste (40° 44' S 64° 57' O) y San Antonio Este (40° 49' S 64° 57' O), Provincia de Río Negro, Argentina. Las larvas fueron colectadas en la cavidad visceral de los peces, cerca del órgano epigonal, un tejido linfomieloide estrechamente asociado a las gónadas y exclusivo de los peces cartilaginosos. Hay evidencias documentadas que las altas concentraciones de urea en tejidos y fluídos corporales tornan inhabitable el medioambiente celómico para ser colonizado por helmintos. Los resultados expuestos en este trabajo constituyen el primer reporte de L de Anisakis sp. en la cavidad corporal 3 de un elasmobranquio, en particular A. platana, y demuestran la capacidad de este anisákido para sobrevivir en la masa visceral de estos hospederos.; This communication is the first record of the presence of a third stage larva of Anisakis sp. infecting Atlantoraja platana. The hosts were collected from fishery landings at processing plants of San Antonio Oeste (40° 44' S 64° 57' O) and San Antonio Este ports (40° 49' S 64° 57' O), Rio Negro province, Argentina. They were found in the visceral cavity near the epigonal organ, a lymphomyeloid tissue closely associated with gonads and only in cartilaginous fish. The high concentrations of urea in the body fluid and tissues of elasmobranch hosts made an inhospitable environment to the colonization of helminthes. The results produced by this work constitute the first report of L of Anisakis sp. in the body cavity of an elasmobranch, in particular 3 A. platana, and show the capability of this anisakid to survive in the visceral mass of these hosts.

The growth-employment-poverty nexus in Latin America in the 2000s: Venezuela Country Study Cruces, Guillermo Antonio; Fields, Gary; Jaume, David José; Viollaz, Mariana Venezuela experienced slow economic growth during the 2000s. The economy suffered a recession in the early years of the period and during the international crisis of 2008, but most labour market indicators improved and moved along with the business cycle over the period. The only indicators that did not improve were the composition of employment by occupational position and the percentage of workers registered with social security, which remained essentially unchanged. Most of the labour market indicators were affected negatively by the international crisis, and some of them had not recovered their pre-crisis levels by 2012.