Inicios de las neurociencias en la Argentina: Redes de trabajo, ciencia y política; Beginnings of Neuroscience in Argentina: Working Networks, Science and Politics Rieznik, Marina Andrea Este trabajo forma parte de una investigación más amplia que intenta mostrar los vínculos profesionales y prácticas de algunos de los primeros investigadores que conformaron el campo de las neurociencias en el país. En particular se enfocará aquí el establecimiento en el país de un español discípulo de Ramón y Cajal llamado Pío Del Río Hortega. El análisis de fuentes permitirá además resolver interpretaciones divergentes sobre cuál fue la relación del investigador con los equipos locales en el período 1939‐ 1945. Se sostiene que para dilucidarlo se debe atender en particular a las redes de relaciones económicas, políticas, académicas, nacionales e internacionales que integraba Bernardo Houssay.; This work is part of a wider research, which aims to show the professional relations and practices of some the first researchers who were part of the neuroscience field in Argentina. We will specifically focus on a Spanish disciple of Ramon y Cajal called Pío Del Río Hortega, and his arrival and settling in the country. The analysis of sources will also allow us to solve the diversity of interpretations about what was the relationship between the researcher and the local teams during the period of 1939‐1945. We claim that, in order to elucidate this issue, it is imperative to take into particular consideration the net of economical, political, academic, national and international relations in which Bernardo Houssay was integrated.

La Cooperativa Copacabana y el barrio La Asunción: De la erradicación de la Villa 31 a la autoconstrucción de vivienda durante la última dictadura militar argentina (1976-1983) Daich Varela, Leandro El presente artículo se centra en la organización y trabajo de la cooperativa de autoconstrucción Copacabana, creada en la Villa 31, Buenos Aires, Argentina, durante la última dictadura militar argentina (1976-1983). Esta cooperativa fue la primera de un total de catorce que buscaron responder a las políticas urbanas de erradicación de las villas de la Ciudad de Buenos Aires. Este trabajo analizará el proceso de conformación de Copacabana y la autoconstrucción de su primer barrio: La Asunción. A su vez, se buscará explorar las estrategias, ideas y conflictos que la cooperativa durante su funcionamiento. En este sentido, se presta especial atención a las transformaciones sociales y espaciales de la cooperativa y el barrio.; This paper analyzes the organization and works of the Copacabana Housing Cooperative, created in the Villa 31, in Buenos Aires, Argentina, during Argentina's last military dictatorship (1976- 1983). This cooperative was the first of a set of fourteen that emerged as a contentious organization against the exclusionary urban policies of, during which a violent eradication program of the shanty towns of Buenos Aires was carried out. This article will analyze the formation process of Copacabana and the construction of La Asuncion, its first housing project. Also, this paper aims to explore the strategies, ideas and conflicts of the Copacabana Housing Cooperative throughout its pursue to create new communities for the evicted of the shanty towns of Buenos Aires, during the most violent and repressive period of Argentina.

On abstract normalisation beyond neededness Bonelli, Eduardo Augusto; Kesner, Delia; Lombardi, Carlos; Ríos, Alejandro We study normalisation of multistep strategies, strategies that reduce a set of redexes at a time, focusing on the notion of necessary sets, those which contain at least one redex that cannot be avoided in order to reach a normal form. This is particularly appealing in the setting of non-sequential rewrite systems, in which terms that are not in normal form may not have any needed redex. We first prove a normalisation theorem for abstract rewrite systems (ARS), a general rewriting framework encompassing many rewriting systems developed by P-A. Melliès [20]. The theorem states that multistep strategies reducing so called necessary and never-gripping sets of redexes at a time are normalising in any ARS. Gripping refers to an abstract property reflecting the behaviour of higher-order substitution. We then apply this result to the particular case of PPC, a calculus of patterns and to the lambda-calculus with parallel-or.

In search of a lost village: Prospecting techniques at the site mariano miró (la pampa, argentina, early twentieth century) Tapia, Alicia Haydee; Doval, Jimena; Montanari, Emanuel; Pineau, Virginia Giselle; Caretti, Florencia; Landa, Carlos Gilberto Archeological research started in Mariano Miró (Chapaleufú, La Pampa, Argentina) site in 2011. In this site there are remains of a rural village, founded in 1901 by the railway station under the same name of the Ferrocarril Oeste, with its header in Buenos Aires city. This village was inhabited by nearly 500 people and there was a series of shops typical of an agricultural-livestock occupation (stores, a baker's shop, a smith house, etc.). Towards 1911 it had to be abandoned forcibly because its inhabitants could not renew their lease agreement over the lands they settled in. As from that moment, its owners destined that space to agricultural exploitation, and therefore no village structures were left standing. The Mariano Miró archaeological study is included in an investigation that aims at learning population dynamics in the late nineteenth and early twentieth centuries. During those times, lands were incorporated to the national territory after military campaigns against indigenous populations. This study presents results obtained through different prospecting techniques applied to delimit the old village common land. Although nowadays no surface structural remains are seen, the presence of a great number of vitreous, ceramic and metallic fragments was recorded, from which a 240 × 140 m study area was set. Over the whole surface of that area, covering 39,200 m2, transects were laid out; prospecting was conducted with a metal detector and a systematic collection of surface material was made. The diversity of data obtained was processed by Geographic Information System (GIS) which, together with ARCGIS10 software, enabled us to correlate multiple variables. The use of documentary sources (aerial photographs, cartography and village layout blueprints) helped identify site formation processes, old buried structures and areas associated with specific social practices. The prospecting design applied let us guide archaeological interventions in such a large area and, based on the distribution and density of these findings, it helped differentiate sectors that would respond to deliberate social practices during village occupation (e.g. dumps), from those that would be the result of post-depositional anthropic and natural processes.

An archaeobotanical perspective in the study of inflorescence phytoliths of wild grasses from arid and semi-arid environments of Argentina Babot, Maria del Pilar; Musaubach, María Gabriela; Plos, Anabela Wild cereals have been harvested all over the world by hunter-gatherer with evidences as much in South America as in Australia, North America and Subsaharian Africa. In some places there are still used for human consumption. The goal of this paper is to document phytoliths in inflorescence axis, and in kernels/inflorescences/bracts of several native Argentinian wild grasses in order to get an archaeobotanical comparative referential for the analyses of residues from both food plant processing activities and consumption. We could observe typical phytolith morphotypes from specific anatomical parts of grasses, but non-taxon specific, as well as non-diagnostic phytolith morphotypes, but characteristic of the phytolith association of a certain taxa. They all allow us to get a more complete view of the phytolith production for each specific taxon. Results obtained by Morisita Test-Past Program-suggest a trend to the organization at the level of subfamilies for the phytoliths production in the 14 species studied. Species of the genus Aristida and Cynodon show an intra-generic consistency in the production of phytoliths morphotypes per organ, and tend to be grouped in cluster analysis. In some species as Cynodon dactylon, Bromus catharticus, Aristida adscensionis, Sorghastrum pellitum and Paspalum dilatatum it can be noted a similarity in the morphotype production as much in inflorescence axis as in kernels/inflorescences/bracts. A morphological continuum between similar morphotypes could be also established, by comparing series of shapes within fragments of silicified plant tissue. Finally, we consider phytolith production from potential useful plant parts for human consumption, in a way as their presence alone, or associated with starch grain analyses, as showed by a previous work, could be used for regional dietary reconstructions. Our results from inflorescence/kernel phytolith production give us good expectation to be able to identify them in archaeological contexts.

Slow-release formulations of the herbicide picloram by using Fe-Al pillared montmorillonite Marco Brown, José Luis; Undabeytia, Tomás; Torres Sanchez, Rosa Maria; Dos Santos Afonso, María Slow-release formulations of the herbicide picloram (PCM, 4-amino-3,5,6-trichloropyridine-2-carboxylic acid) were designed based on its adsorption on pillared clays (pillared clays (PILCs)) for reducing the water-polluting risk derived from its use in conventional formulations. Fe–Al PILCs were synthesized by the reaction of Na+-montmorillonite (SWy-2) with base-hydrolyzed solutions of Fe and Al. The Fe/(Fe + Al) ratios used were 0.15 and 0.50. The PCM adsorption isotherms on Fe–Al PILCs were well fitted to Langmuir and Freundlich models. The PCM adsorption capacity depended on the Fe content in the PILCs. Slow-release formulations were prepared by enhanced adsorption of the herbicide from PCM-cyclodextrin (CD) complexes in solution. CDs were able to enhance up to 2.5-fold the solubility of PCM by the formation of inclusion complexes where the ring moiety of the herbicide was partially trapped within the CD cavity. Competitive adsorption of anions such as sulfate, phosphate, and chloride as well as the FTIR analysis of PCM-PILC complexes provided evidence of formation of inner sphere complexes of PCM-CD on Fe–Al PILCs. Release of the herbicide in a sandy soil was lower from Fe–Al PILC formulations relative to a PCM commercial formulation.

Determination of two unknown thermal coefficients through an inverse one-phase fractional Stefan problem Ceretani, Andrea Noemí; Tarzia, Domingo Alberto We consider a semi-infinite one-dimensional phase-change material with two unknown constant thermal coefficients among the latent heat per unit mass, the specific heat, the mass density and the thermal conductivity. Aiming at the determination of them, we consider an inverse one-phase Stefan problem with an over-specified condition at the fixed boundary and a known evolution for the moving boundary. We assume that it is given by a sharp front and we consider a time fractional derivative of order α (0 < α < 1) in the Caputo sense to represent the temporal evolution of the temperature as well as the moving boundary. This might be interpreted as the consideration of latent-heat memory effects in the development of the phase-change process. According to the choice of the unknown thermal coefficients, six inverse fractional Stefan problems arise. For each of them, we determine necessary and sufficient conditions on data to obtain the existence and uniqueness of a solution of similarity type. Moreover, we present explicit expressions for the temperature and the unknown thermal coefficients. Finally, we show that the results for the classical statement of this problem, associated with α = 1, are obtained through the fractional model when α → 1-.

Pyrolysis kinetics of regional agro-industrial wastes using isoconversional methods Saffe Pinto, María Alejandra; Fernandez Brizuela, Anabel Alejandra; Echegaray, Marcelo Eduardo; Mazza, German Delfor; Rodriguez, Rosa Ana The thermochemical conversion, under inert atmosphere, at high heating rate of agro-industrial wastes was studied using thermogravimetric analysis. Two reaction mechanisms were supposed: (a) The thermal solid decomposition is carried out through a single reaction; or (b) this occurs through several independent parallel reactions based on its main components. Kinetic isoconversional methods were applied to both proposed mechanisms. The best fit was obtained for the single-reaction models. Nevertheless, to study the influence of pseudocomponent decomposition in the global process, the kinetic behavior of each of them was analyzed. The R2 and D3 models represent the thermal decomposition of biomass wastes and their pseudocomponents. The first model supposes that the reactions tend at first order, and the second assumes that the diffusion is the predominant phenomenon. In all cases, the model with the best fit for the cellulose decomposition is the same for the single global reaction model. The enthalpy variations are positive, indicating that the reactions are endothermic. The entropy variations have negative values, signifying that these processes are slow. The Gibbs free energy variations exhibited positive values, revealing that the total system energy increased at the approach of the reagents and the formation of the activated complex.

¿Reserva, puerto o ría?: Conflicto socioambiental en el estuario de Bahía Blanca, Argentina; Natural reserve, port or ría?: Socio-environmental conflict in the estuary of Bahia Blanca, Argentina Noceti, Maria Belen En el estuario de Bahía Blanca se superponen dinámicas de relación entre humanos y no humanos muy disímiles entre sí, dando cuenta de la constitución de schematas de praxis luchando por legitimarse y prevalecer unas sobre otras. Tal situación se observa en el devenir de conflictos socioambientales por el uso del estuario. El abordaje etnográfico posibilita la identificación en el sector de tres tipos de schematas: la ría, el puerto y la reserva. En cada una de ellas se pueden describir tipos de vinculación entre seres vivos, humanos y no humanos, a través de los que es posible delinear formas específicas de identificación/alteridad, clasificación y toponimia. Se propone además, que las disputas y conflictos derivados por la utilización de los recursos marítimo-costeros enmascaran a su vez relaciones asimétricas en la constitución de procesos sociopolíticos.; In the estuary of Bahía Blanca; different dynamics between humans and non humans overlap each other accounting for the constitution of schematas of praxis. Each one struggling for legitimacy and prevailing over the other. Such a situation is observed in the development of socio-environmental conflicts in the use of the estuary. An ethnographic approach enables the construction of three types of schematas in the area: the ría, the port and the natural reserve. In each one, forms of relationship between human and non-human beings are described; that delineate specific forms of identification / otherness, classification and toponym systems. It is also suggested that disputes and conflicts derived from the use of marine and coastal resources, in turn mask asymmetric relations in the constitution of social political processes.

A two-step mixed inpainting method with curvature-based anisotropy and spatial adaptivity Ibarrola, Francisco Javier; Spies, Ruben Daniel The image inpainting problem consists of restoring an image from a (possibly noisy) observation, in which data from one or more regions are missing. Several inpainting models to perform this task have been developed, and although some of them perform reasonably well in certain types of images, quite a few issues are yet to be sorted out. For instance, if the image is expected to be smooth, the inpainting can be made with very good results by means of a Bayesian approach and a maximum a posteriori computation [2]. For non-smooth images, however, such an approach is far from being satisfactory. Even though the introduction of anisotropy by prior smooth gradient inpainting to the latter methodology is known to produce satisfactory results for slim missing regions [2], the quality of the restoration decays as the occluded regions widen. On the other hand, Total Variation (TV) inpainting models based on high order PDE diffusion equations can be used whenever edge restoration is a priority. More recently, the introduction of spatially variant conductivity coefficients on these models, such as in the case of Curvature-Driven Diffusion (CDD) [4], has allowed inpainted images with well defined edges and enhanced object connectivity. The CDD approach, nonetheless, is not quite suitable wherever the image is smooth, as it tends to produce piecewise constant restorations. In this work we present a two-step inpainting process. The first step consists of using a CDD inpainting to build a pilot image from which to infer a-priori structural information on the image gradient. The second step is inpainting the image by minimizing a mixed spatially variant anisotropic functional, whose weight and penalization directions are based upon the aforementioned pilot image. Results are presented along with comparison measures in order to illustrate the performance of this inpainting method.

Políticas homosexuales en la Argentina reciente (1970-1990s); Homosexual policies in recent Argentina (1970-1990s) Theumer, Emmanuel Alejandro El siglo XX de Argentina estuvo signado por sucesivos golpes de Estado queafectaron decididamente la vida política, pero fueron también sus interregnos, los periodos de apertura democrática, los que facilitaron el impulso de organizaciones homosexuales,también feministas, tanto a inicios de la década de los años 70 como de la de los 80. Nos proponemos aquí analizar la emergencia de un conjunto de políticas sexuales, un despliegue escénico?disidente de la sexualidad, que tuvieron lugar bajo dicho periodo histórico: a inicios de los años 70, fundamentalmente a través de un puñado de microgrupos integrados al Frente de Liberación Homosexual (1971-1976) y, por segundo, la aperturademocrática de 1983, a través de organizaciones efímeras y otras con mayor persistencia, tal el Movimiento de Liberación Homosexual (1984-c. 1988) de la ciudad de Rosario y Comunidad de Homosexuales de Argentina (1984-) con sede en la ciudad de Buenos Aires.; The twentieth century of Argentina was marked by a collection of coups d’etat that decisively affected political life, but it was also the time intervals among them, the periods of democratic openness, those that in fact facilitated the promotion of homosexual organizations, also feminist, both at the beginning of the decade of the ‘70 as of the 1980s. We propose here to analyze the emergence of a set of sexual policies, a scenicdissident deployment of sexuality, that took place under this historical period: in the early 1970s, mainly through a handful of microgroups integrated to the Front Homosexual Liberation (1971-1976) and, secondly, the democratic opening of 1983, through ephemeral organizations and others with greater persistence, such as the Homosexual Liberation Movement (1984-c. 1988) of the city of Rosario and the Community of Homosexuales de Argentina (1984-) based in the city of Buenos Aires.

Estudios geoeléctricos de subsuelo sobre estructuras vinculadas a la Falla El Tigre, San Juan; Geoelectrical study on structures associated to El Tigre fault, San Juan Peri, Verónica Gisel; Fazzito, Sabrina Yesica; Bello Camilletti, Gonzalo; Rapalini, Augusto Ernesto; Cortés, José María La Falla El Tigre se ubica sobre el margen occidental de la Precordillera sanjuanina, la región con mayor actividad sismológica de Argentina. Es una falla regional de rumbo N-S de desplazamiento oblicuo con componente dextral y constituye una estructura muy singular por su buen grado de exposición y los significativos marcadores geomórficos de desplazamiento preservados. En la parte central de la Falla El Tigre se destacan estructuras con dirección ~NO-SE que controlan el acomodamiento de la deformación y que responden a estructuras del basamento. El presente trabajo expone dos perfiles geoeléctricos sobre lineamientos oblicuos y sobre estructuras secundarias asociadas. Los lineamientos están vinculados a fallas subverticales que afectan al basamento neógeno y que tendrían una cinemática de rumbo sinestral inferida por recientes estudios paleomagnéticos en rocas neógenas y depósitos pleistocenos y por comparación con estructuras homólogas de la Precordillera. Esta deformación sería pliocena a pleistocena temprana. En el bloque bajo oriental de la Falla del Tigre se identificaron lomadas escalonadas y sigmoidales que exponen basamento neógeno y depósitos pleistocenos y que están vinculadas a fallas subverticales que ascienden y flexuran el sustrato. En su conjunto, estas estructuras constituyen una faja de cizalla dextral limitada por la Falla El Tigre al oeste y por un frente oriental NNO-SSE al este y habrían estado activas hasta el Pleistoceno tardío. Las evidencias geofísicas y geológicas presentadas confirman la complejidad de la deformación por rotación de múltiples bloques menores asociada a la Falla El Tigre y la importancia de estructuras oblicuas que controlan la cinemática de la deformación.; The Precordillera Argentina is the region with the greatest seismological activity in the country. El Tigre fault extends through the western margin of the San Juan Precordillera and it is an N-S trend regional strike-slip fault with dextral heading component that constitutes a unique structure due to a good preservation of geomorphic displacement markers. The central part of the El Tigre fault shows several ~ NO-SE structures that seem to control the deformation related to accommodation in response to basement structures. This work presents two geoelectric profiles through oblique lineaments and on associated secondary structures. The lineaments related to subvertical faults affect the Neogene basement with no apparent tilt displacement and the kinematics was inferred by comparison with homologous structures of the Precordillera. This deformation would be Pliocene to early Pleistocene, according with recent paleomagnetic results in neogene and pleistocene rocks. Right-step sigmoidal folds at the eastern lower block of the El Tigre fault expose Neogene basement and Pleistocene deposits, due to an uplift and flexure of the substrate. The geoelectric profiles suggest that the folds are in response to subvertical faults activity. These structures are consistent with a dextral shear band bounded to the west and to the east by the El Tigre fault and a NNO-SSE fault, respectively. This deformation would be active until the late Pleistocene. The presented geophysical and geological evidences confirm the complexity of the deformation by rotation of multiple smaller blocks associated to the El Tigre fault and the importance of oblique structures that control the kinematics of the deformation.

Effect of body size and temperature on respiration of Galaxias maculatus (Pisces: Galaxiidae) Milano, Daniela; Vigliano, Pablo Horacio; Beauchamp, David Body mass and temperature are primary determinants of metabolic rate in ectothermic animals. Oxygen consumption of post-larval Galaxias maculatus was measured in respirometry trials under different temperatures (5–21 °C) and varying body masses (0.1–>1.5 g) spanning a relevant range of thermal conditions and sizes. Specific respiration rates (R in g O2 g−1 d−1) declined as a power function of body mass and increased exponentially with temperature and was expressed as: R = 0.0007 * W −0.31 * e 0.13 * T. The ability of this model to predict specific respiration rate was evaluated by comparing observed values with those predicted by the model. Our findings suggest that the respiration rate of G. maculatus is the result of multiple interactive processes (intrinsic and extrinsic factors) that modulate each other in ‘meta-mechanistic’ ways; this would help to explain the species’ ability to undergo the complex ontogenetic habitat shifts observed in the lakes of the Andean Patagonic range.

Identification of Trypanosoma cruzi Discrete Typing Units (DTUs) in Latin-American migrants in Barcelona (Spain) Abras, Alba; Gállego, Montserrat; Muñoz, Cármen; Juiz, Natalia Anahí; Ramirez Gomez, Juan Carlos; Cura, Carolina Inés; Tebar, Silvia; Fernández Arévalo, Ana; Pinazo, María Jesús; de la Torre, Leonardo; Posada, Elizabeth; Navarro, Ferran; Espinal, Paula; Ballart, Cristina; Portús, Montserrat; Gascón, Joaquim; Schijman, Alejandro Gabriel Trypanosoma cruzi, the causative agent of Chagas disease, is divided into six Discrete Typing Units (DTUs): TcI–TcVI. We aimed to identify T. cruzi DTUs in Latin-American migrants in the Barcelona area (Spain) and to assess different molecular typing approaches for the characterization of T. cruzi genotypes. Seventy-five peripheral blood samples were analyzed by two real-time PCR methods (qPCR) based on satellite DNA (SatDNA) and kinetoplastid DNA (kDNA). The 20 samples testing positive in both methods, all belonging to Bolivian individuals, were submitted to DTU characterization using two PCR-based flowcharts: multiplex qPCR using TaqMan probes (MTq-PCR), and conventional PCR. These samples were also studied by sequencing the SatDNA and classified as type I (TcI/III), type II (TcII/IV) and type I/II hybrid (TcV/VI). Ten out of the 20 samples gave positive results in the flowcharts: TcV (5 samples), TcII/V/VI (3) and mixed infections by TcV plus TcII (1) and TcV plus TcII/VI (1). By SatDNA sequencing, we classified the 20 samples, 19 as type I/II and one as type I. The most frequent DTU identified by both flowcharts, and suggested by SatDNA sequencing in the remaining samples with low parasitic loads, TcV, is common in Bolivia and predominant in peripheral blood. The mixed infection by TcV–TcII was detected for the first time simultaneously in Bolivian migrants. PCR-based flowcharts are very useful to characterize DTUs during acute infection. SatDNA sequence analysis cannot discriminate T. cruzi populations at the level of a single DTU but it enabled us to increase the number of characterized cases in chronically infected patients.

Weighted least squares solutions of the equation AXB - C = 0 Contino, Maximiliano; Giribet, Juan Ignacio; Maestripieri, Alejandra Laura Let H be a Hilbert space, L(H) the algebra of bounded linear operators on H and W ∈ L(H) a positive operator such that W^1/2 is in the p-Schatten class, for some 1 ≤ p < ∞. Given A,B ∈ L(H) with closed range and C ∈ L(H), we study the following weighted approximation problem: analyze the existence ofmin{ ||AXB − C||p,W , X ∈L(H)}, (0.1)where ||X ||p,W = ||W^1/2 X ||p . We also study the related operator approximation problem: analyze the existence ofmin {(AXB − C)*W (AXB − C), X ∈L(H)}, (0.2)where the order is the one induced in L(H) by the cone of positive operators. In this paper we prove that the existence of the minimum of (0.2) is equivalent to the existence of a solution of the normal equation A*W (AXB − C) = 0. We also give sufficient conditions for the existence of the minimum.

Análisis de la vigencia y aplicación de ley de educación sexual integral a diez años de su sanción; Analysis of the validity and implementation of sex education law to ten years after his publication Patierno, Nicolas; Perín, Giuliana Carolina En este artículo pretendemos analizar los debates vigentes en torno a la educación sexual en escuelas públicas secundarias, con particular atención a la aplicación de la Ley de Educación Sexual Integral N° 26.150, pasados diez años de su sanción. Para llevar a cabo dicho análisis partimos del supuesto que la Ley mencionada no aparecería de manera clara y explícita en las prácticas docentes cotidianas del nivel secundario. En esta línea, consideramos que la sanción de la ley y la información contenida en sus artículos no coincidirían con su aplicación. Acompañando esta hipótesis, consideramos que la sexualidad -interpretada como problemática social contemporánea-, se halla influenciada y mediada por vertiginosos cambios histórico-sociales que imposibilitan una definición ortodoxa e inmodificable capaz de esclarecer su abordaje metodológico. Tanto su indefinición, como su imprecisión teórica, dan cuenta de un espacio susceptible de interpretaciones ambiguas y precarias. La propuesta de análisis adopta un enfoque mixto, en el que se incluye un recorrido por autores claves, documentos oficiales asociados al campo de la educación sexual y el análisis de datos cuantitativos.; This article analyzes the current discussions on sex education in public high schools, with particular attention to the implementation of the Integral Sexual Education Law 26.150, after ten years of his publication. To perform this analysis, it is assumed that the aforementioned law would not appear clearly and explicitly in daily teaching practices at the secondary level. In this line, we believe that the enactment of the law and the information contained in its articles would not coincide with the implementation of it. Accompanying this hypothesis, we believe that sexuality, played as contemporaneous- social problems, it is influenced and mediated by dramatic historical and social changes that prevent an orthodox and unchanging definition can clarify its methodological approach. Both its vagueness, as its theoretical inaccuracy, realizes susceptible space of ambiguous and precarious interpretations. The proposed analysis adopts a mixed approach, which includes a tour of key authors, official documents related to the field of sexual education and analysis of quantitative data.

Magnetostratigraphy of the Rabot Formation, Upper Cretaceous, James Ross Basin, Antarctic Peninsula Milanese, Florencia Nidia; Olivero, Eduardo Bernardo; Kirschvink, Joseph L.; Rapalini, Augusto Ernesto Problems of endemism and diachronous extinctions make global correlation of coeval strata in the mid Campanian-Maastrichtian of the James Ross Basin problematic. To provide a more precise chronological framework, we present two magnetostratigraphies of Campanian strata from the Rabot Formation that crops out at Hamilton Norte (200 m thick) and Redonda Point (340 m thick) in James Ross Island. Sampled sections consist of poorly-consolidated, drab-colored fine sandstones and mudstones. Bulk susceptibility logs of both sections show a similar pattern of relatively low values at the lower and upper levels with significantly higher values at mid-levels that confirms the lithostratigraphic correlation between sections. Rock magnetic studies suggest that this change is not attributable to a ferrimagnetic fraction but to a paramagnetic contribution of presumed detrital origin. Stepwise thermal demagnetization showed dominant unblocking temperatures higher than 400 °C. Progressive hybrid low-temperature cycling, low-field AF and thermal demagnetization in a controlled N2 atmosphere, reveals a two-polarity characteristic component of possible primary origin. Rock magnetic experiments suggest that detrital titano-magnetite is the most likely remanence carrier. Anisotropy of magnetic susceptibility results show sedimentary fabrics, indicating that beds were not significantly buried or compacted. Magnetostratigraphies produced at each locality demonstrate a consistent change from reverse to normal polarity remanence in the middle of the sections. Biostratigraphic constraints identify this reversal as the C33r/C33n transition, indicating a 79.90 Ma depositional age for this level of the Rabot Formation. The remanence directions yield a mean whose corresponding paleopole is consistent with two recently obtained Upper Cretaceous reference paleopoles for the Antarctic Peninsula. Our data support the lack of tectonic rotation or oroclinal bending of this region since the Late Cretaceous.

Preface Spinedi, Eduardo Julio; Cardinali, Daniel Pedro; Gagliardino, Juan Jose In spite of the increased attention devoted to the literature and by health ministries, overweight and obesity prevalence continues to increase worldwide [1] . A systematic analysis performed in 2013 referred to the global burden of these conditions, and showed that more than 50% of the world’s 671 million obese people live in 10 countries: the United States, China, India, Russia, Brazil, Mexico, Egypt, Germany, Pakistan, and Indonesia [2] . Additionally, overweight/obesity has unhealthy outcomes such as diabetes, hypertension, and cancer [3] .

Helechos arborescentes en la Antártida Vera, Ezequiel Ignacio; Cesari, Silvia Nelida En este artículo se discute la presencia de los representantes del orden Cyatheales en la flora aptiana de la Formación Cerro Negro (Isla Livingston, Antártida), entre los que se incluyen cuatro taxones basados en petrificaciones de tallos, tres especies de frondes, y esporas aisladas. La presencia de esta considerable diversidad (representada además por numerosos especímenes) sugiere que el estrato arborescente no estaba restringido a las coníferas, sino que además era ocupado por los helechos. Además, considerando los requisitos ecológicos actuales de este grupo de helechos arborescentes, se sugieren condiciones climáticas relativamente benignas en la región hace 120 millones de años.

Ionic conductivity enhancement achieved by the incorporation of ZnO in a lithium tellurite glass Di Pratula, Pablo Emmanuel; Terny, Cintia Soledad; Sola, Mariela Edith; Frechero, Marisa Alejandra The reinforcement of the ionic conductivity in a lithium-vanadium-molybdenum tellurite glass is possible by modified with zinc oxide {0.7 [x ZnO (1 − x) Li2O] 0.3 [0.5 V2O5. 0.5 MoO3]. 2TeO2}. Structural features induced by zinc cation on the glassy matrix have a positive effect on the electrical behavior of the modified glass. The electrical response of the Zn/Li tellurite glass studied in the present work gives evidence that its ionic conductivity is improved due to the incorporation of small quantities of ZnO suggesting a potential solid ionic electrolyte useful in solid electrochemical devices.