Systematic screening for novel, serologically reactive Hepatitis e Virus epitopes Ostermann Porcel, María Victoria; Vizoso Pinto, María Guadalupe; Haase, Rudolf; Nitschko, Hans; Jaeger, Simone; Sander, Michaela; Motz, Manfred; Mohn, Ulrich; Baiker, Armin Background: The National Institutes of Health classified Hepatitis E as an emerging disease since Hepatitis E Virus (HEV) is the major cause of acute hepatitis in developing countries. Interestingly, an increasing number of sporadic cases of HEV infections are described in industrialized countries as zoonosis from domestic livestock. Despite the increasing relevance of this pathogen in clinical virology, commercial antibody assays are mainly based on fragments of HEV open reading frame (ORF) 2 and ORF3. The largest ORF1 (poly-)protein, however, is not part of current testing formats. Methods. From a synthesized full length HEV genotype 1 cDNA-bank we constructed a complete HEV gene library consisting of 15 respective HEV ORF domains. After bacterial expression and purification of nine recombinant HEV proteins under denaturating conditions serum profiling experiments using 55 sera from patients with known infection status were performed in microarray format. SPSS software assessed the antigenic potential of these nine ORF domains in comparison to seven commercial HEV antigens (genotype 1 and 3) by performing receiver operator characteristics, logistic regression and correlation analysis. Results: HEV antigens produced with our method for serum profiling experiments exhibit the same quality and characteristics as commercial antigens. Serum profiling experiments detected Y, V and X domains as ORF1-antigens with potentially comparable diagnostic significance as the well established epitopes of ORF2 and ORF3. However no obvious additional increase in sensitivity or specificity was achieved in diagnostic testing as revealed by bioinformatic analysis. Additionally we found that the C-terminal domain of the potential transmembrane protein ORF3 is responsible for IgG and IgM seroreactivity. Data suggest that there might be a genotype specific seroreactivity of homologous ORF2-antigens. Conclusions: The diagnostic value of identified ORF1 epitopes might not necessarily improve sensitivity and specificity, but broaden the overall quality of existing test systems. ORF2 and ORF3-antigens are still commonly used in diagnostic assays and possibly hold the potential to serologically differentiate between genotype 1 and 3 infections. Our systematic approach is a suitable method to investigate HEV domains for their serologic antigenicity. Epitope screening of native viral domains could be a preferable tool in developing new serologic test components.

Electronic excited states of protonated aromatic molecules: Protonated Fluorene Alata, Ivan; Broquier, Michel; Dedonder, Claude; Jouvet, Christophe; Marceca, Ernesto José The photo-fragmentation spectrum of protonated fluorene has been recorded in the visible spectral region, evidencing an absorption that appears largely red shifted in comparison to that of the neutral molecule fluorene. The spectrum shows two different vibrational progressions, separated by 0.19 eV. As in the case of protonated linear polycyclic aromatic hydrocarbons (PAHs), comparison of the measured spectra with ab initio calculations allows to associate the observed absorption shift with the charge transfer character of the excited state. The spectra can be properly simulated by geometry optimization of the ground and excited states, followed by Franck Condon analysis. The two vibrational bands progressions observed are assigned, with relatively good confidence, to the existence of two different conformers. © 2011 Elsevier B.V. All rights reserved.

Vascular hyporeactivity to angiotensin II and noradrenaline in a rabbit model of obesity Jerez, Susana Josefina; Scachi, Fabricio; Sierra, Liliana; Karbiner, María Sofía; Peral, Maria de Los Angeles This study was conducted to explore the vascular reactivity of angiotensin II and noradrenaline and their relationship with endothelial function in rabbits fed a high-fat diet (HFD). The animals were fed either an HFD or regular chow [control diet (CD)]. After 12 weeks, the rabbits fed the HFD showed higher blood pressure, body weight, and insulin levels. Glucose tolerance was impaired and positively related to blood pressure. An endothelium-independent decrease of the sensitivity to angiotensin II [pD 2 endothelium-intact aortic rings (E+) in CD: 8.02 ± 0.07 vs. HFD: 7.60 ± 0.01; pD 2 endothelium-removed aortic rings (E-) in CD: 8.16 ± 0.11 vs. HFD: 7.83 ± 0.16] and noradrenaline (pD 2 E+ in CD: 6.36 ± 0.06 vs. HFD: 5.29 ± 0.06; pD 2 E- in CD: 6.11 ± 0.08 vs. HFD: 5.80 ± 0.08) was found. Noradrenaline desensitized the angiotensin II response (pD 2 with noradrenaline pretreatment in E+: 7.03 ± 0.16; in E-: 7.10 ± 0.02), but angiotensin II did not change the noradrenaline response. Acetylcholine maximal relaxation and basal nitric oxide (NO) release were comparable in both diet groups. The efficacy of angiotensin II (R max CD: 4604 ± 574 mg vs. HFD: 3251 ± 533 mg) and noradrenaline (R max CD: 11,675 ± 804 mg vs. HFD: 7975 ± 960 mg) was reduced in E+. L-N G-nitroarginine methyl ester (L-NAME) recovered the efficacy of noradrenaline (R max L-NAME: 12,015 ± 317 mg). In contrast, L-NAME had no effect on the angiotensin II response. Noradrenaline enhanced NO levels, but angiotensin II did not. Therefore, NO was associated with hyporeactivity to noradrenaline. The resting potential was more negative in E+, and the endothelium diminished the angiotensin II-induced depolarization. These findings demonstrated that the crosstalk and the endothelium may induce hyporeactivity to angiotensin II and noradrenaline as a mechanism to compensate the increase in the blood pressure in HFD-induced obesity.

Cobalt nanoparticles on mesoporous MCM-41 and Al-MCM-41 by Supercritical CO2 Deposition Aspromonte, Soledad Guadalupe; Sastre, Alvaro; Boix, Alicia Viviana; Cocero, María José; Alonso, Esther CoO and Co3O4 nanoparticles were uniformly dispersed inside mesoporous MCM-41 and Al-MCM-41 supports using supercritical CO2 reactive deposition. This method represents a one-pot reproducible procedure that allows the dissolution of the organocobalt precursor and supports impregnation in supercritical CO2 at 70 °C and 110 bar, followed by the precursor thermal decomposition into cobalt species at 200 °C and 160 bar. By the relative concentration of the cobalt precursor [cobalt (II) bis (η5-ciclopentadienil)], the load of cobalt nanoparticles was controlled and then determined by Inductively Coupled Plasma (ICP-OES). The synthesis of CoO and Co3O4 species inside the MCM-41 and Al-MCM-41 substrates was confirmed by X-ray Photoelectron (XPS) and Laser Raman Spectroscopies (LRS). By N2 adsorption and Small Angle X-ray Scattering (SAXS), it was determined that the hexagonal arrangement as well as the surface area and pore size of the substrates changed after the addition of cobalt. By means of X-ray mapping from SEM images, a homogeneous distribution of cobalt nanoparticles was observed inside the mesopores when the cobalt loading was 1 wt.%. In addition, spherical cobalt nanoparticles of average diameter close to 20 nm were detected on the outer surface of MCM-41 and Al-MCM-41 supports when the cobalt content was higher. On the other hand, by Transmission Electron Microscopy (TEM), it was possible to measure the interplanar distance of the crystalline plane of the outer nanoparticles, which was later compared with the theoretical distance values which allowed identifying the CoO and Co3O4 phases.

Análisis de la dinámica costera vinculada a la urbanización: los casos de Playa Unión y Playa Magagna (Provincia de Chubut, Patagonia, Argentina); Coastal dynamics analysis related to urbanization: the cases of Playa Unión and Playa Magagna (Chubut province, Patagonia, Argentina) Ferrari, María Paula Dentro de las principales actividades antrópicas que impactan o transforman el ambiente natural se encuentra el proceso de urbanización, y el ambiente costero no está exento de estas intervenciones. En la dinámica costera no sol o intervienen procesos naturales sino también actuaciones humanas, ambos generadores de condiciones de peligro. Si bien existen en Playa Unión y Playa Magagna (Provincia de Chubut, Patagonia Argentina) condiciones de peligrosidad natural vinculadas a procesos geomorfológicos, en los últimos años se ha registrado una creciente ocupación del espacio para urbanización que ha generado diversas transformaciones territoriales en el ambiente costero, acentuando los procesos de peligrosidad natural ya existentes en el área de estudio. El objetivo del trabajo es caracterizar los procesos de la dinámica costera que generan condiciones de peligro en las costas de Playa Unión y Playa Magagna. Para dicha caracterización se articuló el trabajo de campo y la indagación bibliográfica.; The process of urbanization is one of the main human activities that impact or transform the natural environment, and the coastal environment is not exempt from these interventions. Coastal dynamic processes involve not only natural but also human actions, both yielders of hazardous conditions. Eve n though in Playa Unión and Playa Magagna (Chubut Province, Patagonia Argentina) exist natural hazard conditions related to geomorphological processes, recent years have experimented an increasing use of space for urbanization, which developed several territorial changes in the coastal environment accentuating the natural hazard process existing in the study area. The objective of this studio is to characterize the dynamic coastal processes that generate hazardous conditions in the shores of Playa Unión and Playa Magagna. This characterization was based on field-work, literature and document research.

Discurso, neoliberalismo y educación: la precarización laboral de los docentes. Revisando los ´90 Carrizo, Gabriel Alejandro Este artículo está dedicado al análisis del discurso del neoliberalismo pedagógico, que adquirió una presencia hegemónica durante los ´90, y que tenía como objetivo re definir la identidad laboral, al promover la figura de un docente posfordista, flexible, autónomo y disciplinado. Posteriormente, mostraremos que dicho discurso legitimó determinadas políticas que afectaron la condición laboral del colectivo docente, en el marco de una creciente precarización laboral.

Perdonar setenta veces siete: procesos de conformación y transformación de subjetividades juveniles en una iglesia pentecostal del conurbano bonaerense; Forgiving seventy times seven: formation and transformation processes of youth subjectivities in a Pentecostal church of Buenos Aires metropolitan area Mosqueira, Mariela Analía Este trabajo presenta una aproximación a los procesos de conformación y transformación de subjetividades juveniles al interior de comunidades pentecostales. En particular, se vincularán, a través de una experiencia etnográfica, las dimensiones analíticas consideradas para el estudio de la subjetividad: habitus, sensibilidades (corporalidades, embodiment, emociones), procesos de socialización como prácticas rituales y relaciones sociales/intersubjetividad.; Este artigo apresenta uma abordagem dos processos de formação e transformação das subjetividades de jovens em comunidades evangélicas pentecostais. Serão particularmente relacionadas, através de uma experiência etnográfica, as dimensões analíticas utilizadas para o estudo da subjetividade, habitus, sensibilidades (corpo, embodiment, emoções), processos de socialização como práticas rituais e relações sociais/intersubjetividade.; This paper presents an approach to the processes of formation and transformation of youth subjectivities within Pentecostal-Evangelical communities. The analytical dimensions considered for the study of subjectivity will be particularly linked through an ethnographic experience: habitus, sensitivities (body, embodiment, emotions), processes of socialization as ritual practices, and social relations/intersubjectivity.

Derechos, luchas y políticas públicas: la seguridad social en Estados Unidos en la década de 1960; Rights, struggles and public policies: social security in the United States during the sixties Dvoskin, Nicolás La década de 1960 es uno de los momentos más interesantes de la historia estadounidense en materia de luchas sociales. Conflictos de raza y de clase se entrecruzaron configurando un permanente clima de movilización social, al tiempo que los consensos económicos de la inmediata posguerra empezaron a encontrar sus límites. Entendiendo a los derechos sociales como consecuencias de procesos de lucha y, sobre todo, como válidos en tanto socialmente legítimos, en este trabajo se estudia la conformación de la seguridad social ampliada en esta década en clave de su relación con las luchas y conflictos de aquellos tiempos. Con especial énfasis en el proceso de creación de los programas de salud, pero también reconociendo la notable transformación de la cobertura de ingresos para la vejez, en el presente trabajo se subraya que los sesenta muestran a las claras cómo los modelos de integración de tipo fordista necesariamente presentan grietas al implementarse en sociedades desiguales, donde sus beneficios no llegan a todos. De este modo, una seguridad social ampliada surge como respuesta a las insuficiencias del modelo contributivo fordista, pero a la vez choca con límites propios de la idiosincrasia social del país. Causas, desarrollo y límites de la seguridad social de los sesenta son estudiados aquí, siempre en la clave de pensar a los derechos, ante todo, como conquistas sociales; es decir, como el resultado de un proceso de luchas, materiales e ideológicas a la vez; The 1960 decade is one of the most interesting moments of American history in terms of social struggles. Race and class conflicts linked each other, creating a permanent climate of social mobilization. Meanwhile, the economic consensus of the immediate postwar period began to find its limits. Understanding social rights as consequences of struggles and, above all, as valid only if socially legitimate, in this paper there is a study of the formation of extended social security during this decade, in terms of its relationship with the struggles and conflicts that arose during those years. With a special attention on the creation of health insurance programs, but also recognizing the remarkable transformation of the elderly income coverage, in this paper it is stressed that the sixties show the way how Fordist-typed integration models necessarily present weaknesses when implemented in unequal societies, where their benefits do not reach everyone. This way, an extended social security arises as a government response to the insufficiencies of the Fordist cotributive model, but at the same time crashes with the limits imposed by the traditional American ways. Causes, development and limits of the 60´s social security are studied here, always in terms of thinking rights, above all, as social conquests. This means, as the result of a struggle process, material and ideological all at once.

Flavonoids as GABAA receptor ligands: the whole story? Wasowski, Cristina Lucia N.; Marder, Nora Mariel Benzodiazepines are the most widely prescribed class of psychoactive drugs in current therapeutic use, despite the important unwanted side effects that they produce, such as sedation, myorelaxation, ataxia, amnesia, and ethanol and barbiturate potentiation and tolerance. They exert their therapeutic effects via binding to the benzodiazepine binding site of gamma-aminobutyric acid (GABA) type A receptors, and allosterically modulating the chloride flux through the ion channel complex. First isolated from plants used as tranquilizers in folkloric medicine, some natural flavonoids have been shown to possess selective affinity for the benzodiazepine binding site with a broad spectrum of central nervous system effects. Since the initial search for alternative benzodiazepine ligands amongst the flavonoids, a list of successful synthetic derivatives has been generated with enhanced activities. This review provides an update on research developments that have established the activity of natural and synthetic flavonoids on GABA type A receptors. Flavonoids are prominent drugs in the treatment of mental disorders, and can also be used as tools to study modulatory sites at GABA type A receptors and to develop GABA type A selective agents further.

Functional characterization of dI6 interneurons in the neonatal mouse spinal cord Dyck, Jason; Lanuza, Guillermo Marcos; Gosgnach, Simon Our understanding of the neural control of locomotion has been greatly enhanced by the ability to identify and manipulate genetically defined populations of interneurons that comprise the locomotor central pattern generator (CPG). To date, the dI6 interneurons are one of the few populations that settle in the ventral region of the postnatal spinal cord that have not been investigated. In the present study, we utilized a novel transgenic mouse line to electrophysiologically characterize dI6 interneurons located close to the central canal and study their function during fictive locomotion. The majority of dI6 cells investigated were found to be rhythmically active during fictive locomotion and could be divided into two electrophysiologically distinct populations of interneurons. The first population fired rhythmic trains of action potentials that were loosely coupled to ventral root output and contained several intrinsic membrane properties of rhythm-generating neurons, raising the possibility that these cells may be involved in the generation of rhythmic activity in the locomotor CPG. The second population fired rhythmic trains of action potentials that were tightly coupled to ventral root output and lacked intrinsic oscillatory mechanisms, indicating that these neurons may be driven by a rhythm-generating network. Together these results indicate that dI6 neurons comprise an important component of the locomotor CPG that participate in multiple facets of motor behavior.

Soil C and N changes with afforestation of grasslands across gradients of precipitation and plantation age Berthrong, Sean T.; Piñeiro, Gervasio; Jobbagy Gampel, Esteban Gabriel; Jackson, Robert B. Afforestation, the conversion of unforested lands to forests, is a tool for sequestering anthropogenic carbon dioxide into plant biomass. However, in addition to altering biomass, afforestation can have substantial effects on soil organic carbon (SOC) pools, some of which have much longer turnover times than plant biomass. An increasing body of evidence suggests that the effect of afforestation on SOC may depend on mean annual precipitation (MAP). The goal of this study was to test how labile and bulk pools of SOC and total soil nitrogen (TN) change with afforestation across a rainfall gradient of 600–1500 mm in the Rio de la Plata grasslands of Argentina and Uruguay. The sites were all former grasslands planted with Eucalyptus spp. Overall, we found that afforestation increased (up to 1012 kg C·ha−1·yr−1) or decreased (as much as 1294 kg C·ha−1·yr−1) SOC pools in this region and that these changes were significantly related to MAP. Drier sites gained, and wetter sites lost, SOC and TN (r2 = 0.59, P = 0.003; and r2 = 0.57, P = 0.004, respectively). Labile C and N in microbial biomass and extractable soil pools followed similar patterns to bulk SOC and TN. Interestingly, drier sites gained more SOC and TN as plantations aged, while losses reversed as plantations aged in wet sites, suggesting that plantation age in addition to precipitation is a critical driver of changes in soil organic matter with afforestation. This new evidence implies that longer intervals between harvests for plantations could improve SOC storage, ameliorating the negative trends found in humid sites. Our results suggest that the value of afforestation as a carbon sequestration tool should be considered in the context of precipitation and age of the forest stand.

Acanthochelys pallidipectoris (Freiberg 1945) – Chaco Side-Necked Turtle Vinke, Tomas; Vinke, Sabine; Richard, Enrique; Cabrera, Mario Roberto; Paszko, Lorena; Marano, Pablo; Metrailler, Sébastien The Chaco Side-necked Turtle, Acanthochelys pallidipectoris (Family Chelidae), is a small to medium-sized freshwater turtle (carapace length to ca. 180 mm), endemic to the Chaco ecoregion of Argentina, Bolivia, and Paraguay. Its distribution is restricted to the temporarily flooded marshes and lowlands of dry shrub forest with impenetrable soils. The only record outside of the dry Chaco, in Mendoza, Argentina, is likely of anthropogenic origin. The activity period is very short (4–6 months a year), and populations consist of few animals. The species is threatened by habitat loss combined with climatic change leading to increased aridity and diminished ephemeral water resources. The species is currently categorized as Vulnerable on the IUCN Red List based on a 1996 evaluation, but has recently been provisionally re-assessed as Endangered.

Nanoalloying in real time: A high resolution STEM and computer simulation study Mariscal, Marcelo; Mayoral, Alba; Olmos Asar, Jimena Anahí; Magen, César; Mejia Rosales, Sergio Javier; Pérez Tijerina, Eduardo; José Yacamán, Miguel Bimetallic nanoparticles constitute a promising type of catalysts, mainly because their physical and chemical properties may be tuned by varying their chemical composition, atomic ordering, and size. Today, the design of novel nanocatalysts is possible through a combination of virtual lab simulations on massive parallel computing and modern electron microscopy with picometre resolution on one hand, and the capability of chemical analysis at the atomic scale on the other. In this work we show how the combination of theoretical calculations and characterization can solve some of the paradoxes reported about nanocatalysts: Au-Pd bimetallic nanoparticles. In particular, we demonstrate the key role played by adsorbates, such as carbon monoxide (CO), on the structure of nanoalloys. Our results imply that surface condition of nanoparticles during synthesis is a parameter of paramount importance.

Photopolymerization of methacrylate monomers using polyhedral silsesquioxanes bearing side-chain amines as photoinitiator Asmussen, Silvana Valeria; Dell'erba, Ignacio Esteban; Schroeder, Walter Fabian; Vallo, Claudia Ines Organotriethoxysilanes (APS-PGE2) were synthesized by reacting 1 mol of 3-(aminopropyl) triethoxysilane with 2 mol of 1,2-epoxy-3-phenoxypropane (PGE). Polyhedral oligomeric silsesquioxanes functionalized with bulky amino groups (ASSQO) were prepared by hydrolytic condensation of APS-PGE2 catalyzed by formic acid. Methacrylate resins were activated for visible light polymerization by the addition of 1 wt.% CQ in combination with the synthesized ASSQO at loadings between 0 and 30 wt.%. The progress of monomer conversion versus irradiation time showed that the CQ/ASSQO pair is an efficient photoinitiator system because a fast reaction and high conversion result from 60 s irradiation at 600 mW/cm2. The lack of methacrylate groups in the ASSQO, able to polymerize with the methacrylate resin, results in the absence of chemical bond between the ASSQO cages and the matrix. Debonding of ASSQO cages from the polymer give rise to nanovoids; which allows the methacrylate matrix to yield and deform plastically. Consequently, the final effect is a decrease in the flexural modulus and compressive strength with increasing amounts of ASSQO. The present study highlights the surface effect on the overall properties in nanostructured materials.

Las voces del desierto: Aportes para una genealogía del neoliberalismo como racionalidad de gobierno en la Argentina (1955-1975) Grondona, Ana Lucía El presente trabajo argumenta en favor de incorporar el período 1956-1975 a la “genealogía” del neoliberalismo como racionalidad de gobierno disponible en la Argentina desde fines de la década del cincuenta. Está organizado en cuatro apartados. En el primero, se delimitan algunos acontecimientos que muestran la emergencia de una matriz neoliberal de gobierno a partir de la denominada “Revolución Libertadora”. En el segundo, se reflexiona sobre las condiciones de bloqueo de la racionalidad neoliberal como modo generalizado de administrar las poblaciones, aun cuando se tratara ya de una alternativa disponible. En el tercero, se analiza otro antecedente clave para la genealogía propuesta: las disputas de sentido que recorrieron la Revolución Argentina. Finalmente, se analiza el “Plan Rodrigo” como acontecimiento clave en el desbloqueo del neoliberalismo posible en nuestro país.

Justino de Roma, el primer filósofo católico Garcia Bazan, Francisco Justino de Roma es el primer escritor cristiano que ha sostenido el vínculo inseparable entre la fe y la razón. En este sentido, ha afirmado la naturaleza universal y única del pensamiento cristiano y así, en la tesis de esta investigación, le corresponde el título legítimo de primer filósofo católico. Este artículo profundiza en la formación cultural de Justino, para luego dedicarse a evidenciar la importancia filosófica de su Apología, y cómo, finalmente, en el Diálogo con Trifón confirmará o ampliará su doctrina filosófica, teniendo ahora a los judíos como destinatarios de esta demostración.; Justin of Rome (Justin Martyr) is the first Christian writer who has maintained an inseparable link between faith and reason. Thus, he has affirmed the universal and unique nature of Christian thought, and therefore, in the thesis of this research, he possesses the legitimate title of the first Catholic philosopher. This article delves into Justin's cultural background, to later show the philosophical importance of his Apology, and, how, finally, in his Dialogue with Trypho, his philosophical doctrine is confirmed or broadened, with the Jewish people now as the recipients of such demonstration.

Analysis of the reproductive potential of two stocks of Engraulis anchoita in the Argentine Sea; Análisis del potencial reproductivo de dos poblaciones de Engraulis anchoita en el Mar Argentino Pajaro, Marcelo; Leonarduzzi, Ezequiel; Hansen, Jorge; Macchi, Gustavo Javier Relative batch fecundity, spawning frequency, size at 50% maturity, sex ratio, and egg production were estimated for the Bonaerense and Patagonian Engraulis anchoita stocks. Samples were  collected during 19 research surveys carried out over the main spawning seasons and areas of both groups from 1993 to 2008. Reproductive potential between stocks was compared by analyzing the length-class structure and considering environmental variations. Daily egg production varied  between 0.2 × 107 and 7.3 × 107 oocytes and the mean annual value was higher for the  Bonaerense than the Patagonian stock (2.9 × 107 and 0.54 × 107 oocytes, respectively; P <  0.019). In both stocks, larger size classes produced more oocytes than smaller and more abundant females. No correlation was observed between egg production and adult biomass and between egg production and age-1 recruits. Length at first maturity was lower for the Bonaerense than the Patagonian stock (100.3 and 119.8 mm total length, respectively; P < 0.001). Bonaerense and Patagonian spawning frequency estimates were 0.125 and 0.116 (statistically significant differences were not observed, P > 0.788), and mean relative batch fecundity values were 508 and 493  oocytes g–1 (P > 0.680), respectively. Mean annual relative batch fecundity values for the Bonaerense stock showed a negative trend (P < 0.016) in the period 1993–2008, coinciding with a 4 ºC increase in mean sea surface temperature in the area during the same period.; Se estimaron las variables reproductivas de las poblaciones bonaerense y patagónica de Engraulis anchoita, fecundidad parcial relativa (Fr), frecuencia de puesta (S), talla de 50% de madurez sexual (L50%), proporción de sexos (R) y producción diaria de huevos (P0), con material proveniente de 19 campañas de investigación realizadas en las épocas y áreas principales de desove de las dos poblaciones de anchoíta entre 1993 y 2008. El objetivo principal fue comparar la biología reproductiva de las dos poblaciones de E. anchoita, así como su potencial reproductivo, analizando la estructura de tallas y posibles variaciones ambientales. La P0 varió entre 0.2 × 107 y 7.3 × 107 huevos, con un promedio anual más alto en el stock bonaerense (2.9 × 107 huevos) que en el patagónico (0.54 × 107 huevos) (P < 0.019). Se observó que las clases de tallas más grandes produjeron mayor número de ovocitos que clases menores con mayor número de hembras. Por otra parte, no se observó una correlación entre P0 y la biomasa de adultos, o P0 y la biomasa de reclutas de edad 1. La L50% media del stock bonaerense fue de 100.3 mm de longitud total (LT), mientras que la del patagónico fue de 119.8 mm LT (P < 0.001). Las S medias de las poblaciones bonaerense y patagónica fueron 0.125 y 0.116 respectivamente, sin diferencias significativas entre stocks (P > 0.788), y los promedios de Fr fueron similares (508 y 493 ovocitos g–1) (P > 0.680). Se observó una tendencia negativa significativa (P < 0.016) en Fr de la población bonaerense a lo largo de los años, coincidiendo con el incremento de 4 ºC en la temperatura superficial del agua de mar durante la época de puesta de dicha población.

El Material Cerámico de Construcción en San José de Flores a fines del Siglo XIX Camino, Ulises Adrián En Septiembre de 2001, se realizo una excavación arqueológica de rescate en un domicilio particular del barrio porteño de Flores, en la Avenida Nazca 313. Actualmente, este domicilio tiene una actividad comercial. Por este motivo la excavación se realizó en un fin de semana, momento en el cual el local no se encontraba abierto al público La unidad excavada (cuadrícula 1), cuyas dimensiones fueron de 1 metro por 1 metro, alcanzó los 47 cm. de profundidad. En la misma fue hallado abundante material arqueológico, entre ellos el grupo de las tierras cocidas. En este trabajo me centro en el análisis de este último grupo, donde se distinguieron cinco subgrupos: ladrillos, baldosas, azulejos, tejas y una taza de inodoro de Gres. Con este análisis me dispongo generar nueva evidencia para apoyar la cronología que inicialmente se le dio al sitio (fines del siglo XIX), a demás es mi intención mostrar la diversidad de los materiales utilizados en la construcción en el Pueblo de San José de Flores para ese momento.

Sub-THz and Hα activity during the preflare and main phases of a GOES class M2 event Kaufmann, Pierre; Marcon, Rogério; Giménez De Castro, C. Guillermo; White, Stephen M.; Raulin, Jean Pierre; Correia, Emilia; Fernandes, Luis Olavo; De Souza, Rodney V.; Godoy, Rodolfo Alfredo; Marun, Adolfo Hector; Pereyra, Pablo Florencio Radio and optical observations of the evolution of flare-associated phenomena have shown an initial and rapid burst at 0.4THz only followed subsequently by a localized chromospheric heating producing an Hα brightening with later heating of the whole active region. A major instability occurred several minutes later producing one impulsive burst at microwaves only, associated with an M2.0 GOES X-ray flare that exhibited the main Hα brightening at the same site as the first flash. The possible association between long-enduring time profiles at soft X-rays, microwaves, Hα, and sub-THz wavelengths is discussed. In the decay phase, the Hα movie shows a disrupting magnetic arch structure ejecting dark, presumably chromospheric, material upward. The time sequence of events suggests genuine interdependent and possibly non-thermal instabilities triggering phenomena, with concurrent active region plasma heating and material ejection.

Pares inter pares: Controversias acerca de la traducción de Horacio en la Argentina del siglo XIX. El caso de la Revista de Derecho, Historia y Letras Battiston, Dora Delia; Dominguez, Maria Carolina En la Argentina, el siglo XIX –fundante en cuanto a traducción literaria– resulta también pródigo en reflexiones sobre la praxis traslativa. Entre 1899 y 1900, Matí­as Calandrelli instaura la polémica acerca de las versiones de Horacio y la enseñanza misma del latí­n en la Revista de Derecho, Historia y Letras. El análisis focaliza la valoración de la controversia como generadora de traductologí­a, el carácter performativo de las publicaciones periódicas que operan en la construcción de un conocimiento pedagógico y disciplinar de la lengua latina, y, asimismo, la resignificación de la tradición clásica en el campo letrado; To Argentina, the 19th century is not only foundational of a literary translation tradition but it is also profuse in reflections on translational praxis. Between 1899 and 1900, Matías Calandrelli introduces the controversy about the versions of Horace and the very teaching of Latin in the Journal of Law, History and Literature. The analysis focuses on the assessment of dispute as a generator of translation studies, the performative character of periodicals that operate in the construction of a pedagogical and discipline knowledge of the Latin language, and likewise, the re-signifying of the classical tradition in the literate field.