Paleomagnetismo del Grupo Santa Victoria en la sierra de Mojotoro, Salta: aportes a la reconstrucción paleogeográfica de Pampia en el Paleozoico Temprano Rodriguez Piceda Constanza; Franceschinis, Pablo Reinaldo; Escayola Mónica; Rapalini Augusto Estudios sedimentológicos, de magnetofábrica y paleomagnéticos fueron realizados en la Formación La Pedrera (Grupo Santa Victoria) de edad ordovícica temprana en la sierra de Mojotoro, provincia de Salta. Estos estudios tienen el objetivo de contribuir al conocimiento de la posición paleogeográfica del bloque de Pampia durante el Paleozoico temprano en relación al supercontinente de Gondwana. Se coleccionaron muestras orientadas en 12 sitios distribuidos en tres localidades. Estos afloramientos consisten en depósitos de plataforma media a proximal de composición principalmente cuarcítica. Los estudios de anisotropía de susceptibilidad magnética (AMS) sugieren una fábrica depositacional en una de las localidades, mientras que en las otras dos no se puede descartar una cierta influencia tectónica en la fábrica. El estudio paleomagnético permitió determinar una componente magnética característica portada por hematita en los 12 sitios. A partir del promedio de los polos geomagnéticos virtuales de cada sitio, se obtuvo un polo paleomagnético para el Grupo Santa Victoria en estas localidades que se ubica en 340,4°E 38,3°N A95=8,8°. La posición de este polo sugiere que ninguna de las tres localidades sufrió rotaciones tectónicas de significación por la orogenia andina o eventos anteriores. Sin embargo, presenta una paleolatitud algo más baja que la esperada según los polos de referencia de similar edad para el Gondwana. Ensayos de magnetizaciones isotérmicas direccionadas sugieren que esta diferencia no se debería a errores de inclinación por compactación. Por su parte, el polo del Grupo Santa Victoria discrepa con los polos obtenidos para el Grupo Mesón (Cámbrico medio a superior) y la Formación Santa Rosita (Ordovícico basal), al norte de la zona de estudio, pero en la misma región. Estas discrepancias se pueden adjudicar a la posible presencia de rotaciones tectónicas andinas según ejes verticales en las localidades ubicadas al norte de la zona de trabajo o bien indicar que el movimiento de Pampia a lo largo del margen del Cratón del Río de la Plata ya habría concluido o estaba próximo a concluir en el Ordovícico Temprano.

Changes in the feeding ecology of South American sea lions on the southern Brazilian coast over the last two decades of excessive fishing exploration Machado, Rodrigo; Rosa de Oliveira, Larissa; Ott, Paulo Henrique; Denuncio, Pablo Ezequiel; Haimovici, Manuel; Cardoso, Luis Gustavo; Danilewicz, Daniel; Moreno, Ignacio Benites; Borges-Martins, Márcio In the last decades, an increasing fishing effort and a decreasing trend in fish catches have been observed in southern Brazil. Considering that marine mammals and fisheries usually compete for the same resources, it is reasonable to presume that the feeding ecology of these predators is affected by the current scenario. To evaluate this hypothesis, long-term variation in the diet of the South American sea lion (Otaria flavescens) relative to fisheries exploitation was analyzed for two periods (1993–2003 versus 2004–2014). The degree of overlap between the relative biomass of the sea lions’ diet and the target species of six types of local fishery was analyzed. An increase in prey overlap between sea lions and fisheries was observed in the more recent sampling period, along with an increase in prey diversity, richness, and niche breadth of the sea lions’ diet. These results suggest that the overfishing scenario could partly explain the modified feeding ecology of the sea lions. In this context, we recommend a review and better regulation of the current fishing effort in the region, which we believe will be an important step to maintain the fish stocks and minimize the impact of fishing on marine top predators.

Light on the horizon: Current research and future perspectives in flow photochemistry Politano, Fabrizio; Oksdath Mansilla, Gabriela Synthetic organic photochemistry is a powerful tool for creating both natural products and molecules with high structural complexity in a simple way and under mild conditions. However, because of the challenges in scaling-up, it has been difficult to apply a photochemical reaction in an industrial process. Flow chemistry provides an opportunity for better control over the conditions of the reaction and, additionally, improved reaction selectivity and enhanced reproducibility. Taking into account that significant interest has focused on the use of flow photochemistry as a method for the synthesis of heterocycles and its applications in target-oriented synthesis over the past few years, the aim of this review is to highlight recent efforts to apply flow photochemistry methodology to diverse reactions as a greener and more scalable process for the pharmaceutical and fine chemical industries. Additionally, the review highlights future perspectives in the development of scale-up strategies, combining photochemical reactions in the continuous-flow multistep synthesis of organic molecules, which is of interest for scientists and engineers alike.

High Triatoma brasiliensis densities and Trypanosoma cruzi prevalence in domestic and peridomestic habitats in the State of Rio Grande do Norte, Brazil: The source for Chagas disease outbreaks? Lilioso, Mauricio; Folly Ramos, Elaine; Rocha, Fabiana Lopes; Rabinovich, Jorge Eduardo; Capdevielle Dulac, Claire; Harry, Myriam; Marcet, Paula Lorena; Costa, Jane; Almeida, Carlos Eduardo A total of 2,431 Triatoma brasiliensis were collected from 39 populations of Paraíba (PB) and Rio Grande do Norte (RN) states, Brazil. In PB, Trypanosoma cruzi infection was not detected in either peridomestic or domestic vector populations. In contrast, in RN, T. brasiliensis was detected with high parasite prevalence in these ecotopes (30.7-40.0%). Moreover, peridomicile insect population densities were more than double the average densities of all other settings evaluated (19.17 versus < 8.94 triatomine/man-hour). Genotyped parasites evidenced a mix of T. cruzi lineages circulating in both peridomestic and sylvatic populations. Although vector control efforts have dramatically decreased Chagas disease transmission to humans, recent outbreaks have been detected in four municipalities of RN state. Our results clearly evidence a worrisome proximity between infected vectors and humans in RN. Indeed, finding of infected T. brasiliensis inside homes is routinely recorded by local vector control surveillance staff around the outbreak area, challenging the current and conventional view that vector transmissions are controlled in northeastern Brazil. This scenario calls for strengthening vector control surveillance and interventions to prevent further Chagas transmission, especially in RN State.

Effect of Prosopis flexuosa spp. as a nurse plant on nutrient content and productivity of Opuntia ellisiana Griffiths Grunwaldt, Josefina María; Guevara, Juan Carlos; Martinez Carretero, Eduardo Enrique; Grunwaldt, Eduardo Guillermo In arid conditions, the low quality of the forage and water shortage could be attenuated by the introduction of Opuntia species. Several plant species grows well under Prosopis canopy, responding to a higher nutrient content in the soil, It was hypothesized that productivity and nutrient content, mainly crude protein (CP), of Opuntia ellisiana planted under Prosopis would be higher than of those planted outside the canopy, and that these parameters would be influenced by the cactus position: north or south from the centre of the tree. Sampling was done in 18 plants under the canopy of Prosopis and 23 outside of it. After one year of the plantation, the totality of cladodes was harvested. The productivityper plantwas 3.1 and 5.7 cladodes and 34.9 and 48.1 g of dry matter (DM), outside and under the canopy, respectively. The bromatological values (%) were moisture: 89.1 and 91.9, organic matter (OM): 76.7 and 79.8, CP: 4.4 and 8.1, acid detergent fiber (ADF):13.7 and 18.2, neutral detergent fiber (NDF): 29.0 and 31.5, K: 3.1 and 3.6, P: 0.07 and 0.11, Ca: 5.5 and 4.4, Na: 0.04 and 0.02, outside and under the canopy, respectively. Crude protein, moisture, OM, ADF, NDF, K, P and productivity per plant were higher under the canopy, whereas Ca and Na values were higher outside the canopy (p<0.05). Magnesium (1.9 and 1.9%) was not affected by the position outside or under the canopy. The northor south orientation did not influence any of the analysed parameters.

Des-privatizar el sentido común sobre la violencia de género. Análisis de casos de femicidio en Córdoba, Argentina Gastiazoro, Maria Eugenia Este trabajo, presenta un panorama sobre la situación del femicidio en Córdoba, Argentina. A partir del análisis cualitativo y cuantitativo de datos obtenidos de informes estadísticos oficiales y sentencias emitidas en las Cámaras Penales de la Provincia de Córdoba en el año 2016, se analiza qué tipo de hechos ocurridos en un contexto de violencia de género se abordan por la justicia, qué víctimas son las que están dentro de las cifras declaradas y cuáles todavía no son abarcadas y quedan por fuera sin encontrarse incluidxs y narradxs. Se observa y concluye que las muertes violentas de mujeres visibilizadas se encuentran reducidas al "sentido común privatizador" de la categoría de femicidio en el marco de vínculos de pareja e intrafamiliares, heterosexuales, dentro de la construcción binaria individual de sujetos víctimas-victimarios.

Síntesis y caracterización de sílices mesoporosas híbridas para ser utilizadas como nuevos adsorbentes en la remoción de metales pesados de matrices acuosas Martin, Pedro Pablo En el presente trabajo se desarrollaron sólidos adsorbentes a base de sílices mesoporosas ordenadas para la eliminación de metales pesados: Zn(II) y Cr(VI), presentes en matrices acuosas mediante procesos de adsorción. Para ello, se sintetizaron sílices mesoporosas ordenadas con estructuras típicas del sistema MCM-41 (Mobil Composition of Matter N. 41) y posteriormente se modificó la superficie interna mediante el anclado de grupos amino y amino-metilo, respectivamente. Los sistemas resultantes fueron caracterizados por XRD a bajos ángulos, adsorción-desorción de N2 a -196 °C, FTIR, XPS, TGA y SEM a fin de establecer sus propiedades texturales y verificar la presencia de los grupos funcionales introducidos para poder correlacionar estos datos con el desempeño como adsorbente. Se estudiaron en detalle las variables que afectan el desempeño de estos adsorbentes: pH, temperatura, tiempo, presencia de otros iones y se determinaron las capacidades máximas de adsorción para cada uno de los dos metales estudiados. Con la premisa de lograr adsorbentes más eficientes se analizó el proceso de desorción y se determinaron las variables operacionales óptimas para poder reutilizar el adsorbente repetidas veces. Se propusieron mecanismos que permitieron explicar el proceso de adsorción tanto para Zn(II) como para Cr(VI) y sobre este último se hizo énfasis en la reducción Cr(VI)/Cr(III) ocurrida durante el proceso de adsorción. El objetivo de emplear estos sistemas mesoporosos ordenados como adsorbentes es el de lograr procesos de adsorción que presenten elevada eficiencia, rápidos, sin restricciones disfuncionales, selectivos y que los mismos puedan ser fácilmente regenerados y reutilizados durante varios ciclos de adsorción-desorción.

The Neotropical genus Hapalotremus Simon, 1903 (Araneae: Theraphosidae), with the description of seven new species and the highest altitude record for the family Ferretti, Nelson Edgardo; Cavallo, Patricio; Chaparro, Juan C.; Ríos Tamayo, Duniesky; Seimon, Tracie A.; West, Rick New specimens of the genus Hapalotremus (Theraphosinae) are revised based on the examination of types and additional material collected in Argentina, Bolivia and Peru. A new generic diagnosis is proposed. New information and illustrations are provided for known species and seven new species were recognized and are newly described and illustrated. Hence, Hapalotremus comprises 10 valid species, distributed along the Andes and Yungas in western South America. All species are keyed and mapped. New taxonomic features are included in the descriptions and the detail of embolus keels morphology and positions are described for the first time for the genus. Information on species habitat is included. The highest altitude record for a Theraphosidae spider, living at 4524 m above sea level, is reported.

Inmunoterapia en cáncer. Perspectivas actuales, desafíos y nuevos horizontes; Immunotherapy in cancer. Current prospects, challenges and new horizons D'alotto Moreno, Tomas; Blidner, Ada Gabriela; Girotti, Maria Romina; Maller, Sebastian Matias; Rabinovich, Gabriel Adrián La activación del sistema inmunológico en pacientes con cáncer ha sido un objetivo histórico en el campo de la oncología. En las últimas décadas, nuestro entendimiento de la respuesta inmunológica antitumoral ha promovido el desarrollo de novedosas estrategias terapéuticas dando como resultado un cambio de paradigma en el tratamiento del cáncer. La utilización de agentes bloqueantes de puntos de chequeo del sistema inmunológico como PD-1/PD-L1 y CTLA-4, de agonistas de moléculas co-estimuladoras como CD137 y OX-40 y la transferencia adoptiva de células T antitumorales modi cadas genéticamente han generado importantes bene cios clínicos, re ejados en respuestas objetivas y duraderas, en enfermos sin tratamientos convencionales disponibles. Sin embargo, un gran número de pacientes no responde a dichas terapias generando resistencia o sufriendo recaídas de la enfermedad debido a la aparición de circuitos inhibitorios o compensatorios. La combinación racional de estrategias terapéuticas permite eliminar mecanismos de resistencia, mientras que la identi cación de biomarcadores predictivos facilita la selección de pacientes respondedores a dichos tratamientos. Recientes ensayos clínicos y estudios pre-clínicos permiten vislumbrar un escenario optimista con importantesdesafíos en la implementación de estrategias de inmunoterapia en cáncer.; Recent under-standing of the mechanisms that control immune system homeostasis and orchestrate antitumor responses has prompted the development of novel immunotherapeutic modalities. These include antibodies that target immune checkpoints such as PD-1/PD-L1 and CTLA-4, agonistic antibodies of costimulatory molecules such as CD137 and OX-40 and the adoptive transfer of genetically-modified antitumor T cells. However, a large number of patients do not respond to these therapies and develop resistance as a result of activation of compensatory circuits. Rational combination of immunotherapeutic modalities will help overcome resistance and will increase the number of patients who will benefit from these treatments. Moreover, identification of predictive biomarkers will allow selection of patients responding to these treatments. Emerging clinical trials and pre-clinical studies have shown exciting results anticipating new horizons in the design and implementation of cancer immunotherapeutic modalities

Prediction of regional agro-industrial wastes characteristics by thermogravimetric analysis to obtain bioenergy using thermal process Saffe Pinto, María Alejandra; Fernandez Brizuela, Anabel Alejandra; Mazza, German Delfor; Rodriguez, Rosa Ana The use of energy from biomass is becoming more common worldwide. This energy source has several benefits that promote its acceptance; it is bio-renewable, non-toxic and biodegradable. To predict its behavior as a fuel during thermal treatment, its characterization is necessary. The experimental determination of ultimate analysis data requires special instrumentation, while proximate analysis data can be obtained easily by using common equipment but, the required time is high. In this work, a methodology is applied based on thermogravimetric analysis, curves deconvolution and empirical correlations for characterizing different regional agro-industrial wastes to determine the high heating value, the contents of moisture, volatiles matter, fixed carbon, ash, carbon, hydrogen, oxygen, lignin, cellulose and hemicellulose. The obtained results are similar to those using standard techniques, showing the accuracy of proposed method and its wide application range. This methodology allows to determine the main parameters required for industrial operation in only in one step, saving time.

A singular nitric oxide synthase with a globin domain found in Synechococcus PCC 7335 mobilizes N from arginine to nitrate Correa Aragunde, Maria Natalia; Foresi, Noelia Pamela; del Castello, Fiorella Paola; Lamattina, Lorenzo The enzyme nitric oxide synthase (NOS) oxidizes L-arginine to NO and citrulline. In this work, we characterise the NOS from the cyanobacteria Synechococcus PCC 7335 (SyNOS). SyNOS possesses a canonical mammalian NOS architecture consisting of oxygenase and reductase domains. In addition, SyNOS possesses an unusual globin domain at the N-terminus. Recombinant SyNOS expressed in bacteria is active, and its activity is suppressed by the NOS inhibitor L-NAME. SyNOS allows E. coli to grow in minimum media containing L-arginine as the sole N source, and has a higher growth rate during N deficiency. SyNOS is expressed in Synechococcus PCC 7335 where NO generation is dependent on L-arginine concentration. The growth of Synechococcus is dramatically inhibited by L-NAME, suggesting that SyNOS is essential for this cyanobacterium. Addition of arginine in Synechococcus increases the phycoerythrin content, an N reservoir. The role of the novel globin domain in SyNOS is discussed as an evolutionary advantage, conferring new functional capabilities for N metabolism.

Cattle decrease plant species diversity in protected humid temperate savanna Batista, William B.; Mochi, Lucia Sol; Biganzoli, Fernando Question: Is domestic cattle an appropriate surrogate for fire in a protected humid temperate savanna? Study area: El Palmar Grande de Colón (31°52' S, 58°17' W), Argentina. Methods: We surveyed dense Butia yatay palm savannas in two neighboring protected areas, El Palmar National Park (EPNP), under cattle exclusion since 1970 with sporadic burning; and La Aurora Wildlife Refuge (LAWR), under moderate cattle density, and not burnt since 1997. In each area, we randomly selected ten dense savanna stands, established 500 m2 plots and undertook floristic survey in spring and summer to produce exhaustive plant-species lists. We statistically compared the two samples in terms of: local and global diversities; compositional heterogeneity among stands; mean similarity to a historical record from the area; overall species composition; and abundance and numbers of species with different growth habits and origins. Results: Differences between our samples are clear-cut. Savannas at EPNP have significantly increased local and global species richness and exhibit decreased similarities with the historical record. They have a novel understory, with significantly increased abundances and species numbers of fire-resistant grassland shrubs and fire-sensitive trees, and a groundcover with significantly increased richness of subshrub and perennial graminoid species. Savannas at LAWR have virtually no woody understory, and exhibit a groundcover dominated by an impoverished suite of perennial grasses, with significantly increased abundances and numbers of annual and of exotic species. Conclusions: Our results suggest that large-scale, long-term cattle exclusion and sporadic fires have resulted in changes in the structure and composition of the savanna vegetation leading to increased plant species diversity. Apparently, conservation of these humid savannas in protected areas requires periodic fire, while domestic cattle are a poor alternative for maintaining their plant species diversity.

Cretaceous intraplate contraction in Southern Patagonia: A far-field response to changing subduction dynamics? Gianni, Guido Martin; Navarrete Granzotto, César Rodrigo; Liendo, Ingrid Florencia; Díaz, Marianela Ximena Yasmin; Gimenez, Mario Ernesto; Encinas, Alfonso; Folguera Telichevsky, Andres The origin, extent, and timing of intraplate contraction in Patagonia are among the least understood geological processes of southern South America. Particularly, the intraplate Deseado fold-thrust belt (FTB), located in the Patagonian broken foreland (47°–48°300 S), is one of the most enigmatic areas. In this belt, time constraints on tectonic events are limited and synorogenic deposits have not been documented so far. Furthermore, the driving mechanism for intraplate contraction remains unknown. In this study, we carried out a structural and sedimentological analysis. We report the first syntectonic deposits in this area in the Baqueró (Aptian) and Chubut (Cenomanian/Campanian) groups and a newly found unit referred to as the Albian beds (109.9 ± 1.5 Ma). Thus, several contractional stages in late Aptian, Albian, and Cenomanian-Campanian are then inferred. We suggest that the Deseado FTB constituted the southernmost expression of the early Patagonian broken foreland in Cretaceous times. Additionally, we analyzed the spatiotemporal magmatic arc behavior as a proxy of dynamic changes in the Andean subduction during determined stages of intraplate contraction. We observe a significant arc broadening from ~121 to 82 Myr and magmatic quiescence after ~67 Ma. This is interpreted as a slab shallowing to flattening process. Far-field tectonic forces would have been produced by increased plate coupling linked to the slab flattening as indirectly indicated by the correlation between Cretaceous arc expansion and intraplate contraction. Finally, the tectonic evolution of the Deseado FTB favors studies supporting inception of Andean shortening since Cretaceous times.

Petrología y potencial económico de las pegmatitas ubicadas al norte del batolito de Renca, provincia de San Luis, Argentina; Petrology and economic potential of pegmatites located at the north of Renca batholith, San Luis province, Argentina Wul, Julieta Gisele El objetivo principal de esta tesis es el estudio de las relaciones petrológicas entre las pegmatitas y las rocas circundantes localizadas al norte del batolito de Renca, provincia de San Luis, para establecer los vínculos con el magma parental que las habría originado. Otro objetivo de esta tesis es clasificar a las pegmatitas de la región e inferir su potencial metalogenético en base a estudios mineralógicos y geoquímicos. El área de estudio está localizada en el sector centro-este de la Sierra de San Luis, en donde afloran rocas del Complejo Metamórfico Conlara de edad ediacárica-cámbrica representadas por una secuencia de esquistos bandeados, esquistos de grano fino y en menor proporción, bancos de esquistos turmalínicos y turmalinitas. En el área también aflora una suite de granitos de tipo S de edades estimadas cámbrico-ordovícicas conformada por el Plutón La Tapera, el granito Los Alanices y el granito El Peñón. Afloran también los batolitos de Renca y Las Chacras-Potrerillos de edades devónicas. Por último, a lo largo de la fractura de carácter regional denominada Bajo de Véliz-San Felipe-El Morro aflora un conjunto de rocas máficasultramáficas denominado Las Cañas cuya edad se estima que estaría relacionada a procesos famatinianos. Las pegmatitas estudiadas forman parte del grupo Villa Praga-Las Lagunas, perteneciente al distrito pegmatítico Conlara. Se han relevado pegmatitas alojadas en el Complejo Metamórfico Conlara de signatura LCT (Li, Cs, Ta) y también de signatura NYF (Nb, Y, F) alojadas en el batolito de Las Chacras-Potrerillos. Se trata de pegmatitas graníticas, concordantes y discordantes con la roca de caja y son de mineralogía simple compuesta por cuarzo, microclino, albita y muscovita como minerales principales y berilo, turmalina, granate, apatita y circón como minerales accesorios, en algunos casos se encuentra espodumeno y columbita. La mayoría de los cuerpos estudiados presentan zonación donde puede observarse las siguientes zonas: núcleo, intermedia, externa y de borde. Se emplearon todos los criterios geológicos disponibles en esta tesis incluyendo estudios geoquímicos en muscovita y feldespato de las pegmatitas para clasificarlas y se las agrupó en clase elementos raros, subclase REL-Li (Elementos Raros-Litio), tipos berilo y complejo, y estériles a las pegmatitas de la familia LCT y en clase elementos raros, subclase REL-REE (Elementos Raros-Tierras Raras), tipo allanita-monacita a la única pegmatita estudiada de la familia NYF. El análisis de esta información permitió obtener resultados acerca del grado de fraccionamiento de las pegmatitas. Si bien los hallazgos de mineralizaciones de Nb-Ta y de espodumeno son escasos en estas pegmatitas, algunas de ellas presentan características compatibles con este tipo de mineralización que ya ha sido descripta en pegmatitas de áreas cercanas que presentan características similares a las estudiadas en esta tesis. El estudio de difracción de rayos X sobre feldespato indicó elevado grado de ordenamiento y triclinicidad, compatible con microclino bajo. En algunos casos, se observó que el más bajo grado de triclinicidad obtenido en feldespato se correspondería con pegmatitas de menor volumen y morfología de diques. El resultado de análisis petrográficos, químicos (EPMA: microanálisis con sonda de electrones) y de isótopos de boro (SIMS: espectrometría de masa de iones secundarios) en turmalina de pegmatitas NYF y LCT, granito Los Alanices, esquistos con turmalinas y turmalinitas del Complejo Metamórfico Conlara permitieron clasificar a la turmalina dentro de la serie chorlo-dravita y estudiar sus variaciones composicionales químicas e isotópicas dentro de cada cristal. El contenido de boro que llevó a la cristalización de turmalina en las pegmatitas estudiadas se relacionaría con la fusión parcial de los metasedimentos del Complejo Metamórfico Conlara. Datos químicos e isotópicos indican que dichas rocas serían la fuente de los leucomonzogranitos y monzogranitos muscovítico-biotítico de los cuales derivarían los líquidos pegmatíticos. El aporte de boro a ese fundido granítico original provendría de las micas que intervinieron en las reacciones de fusión parcial y probablemente también de reacciones involucrando turmalina. Las condiciones de P y T necesarias para fusión parcial se alcanzaron en un nivel cortical no expuesto. La presencia de rocas máficas de probable edad ordovícica como el gabro de las Cañas podría indicar una posible fuente de calor. Las edades de enfriamiento de las pegmatitas LCT sugieren una historia de enfriamiento común con el encajante metamórfico. La relación del emplazamiento/deformación indica que estas pegmatitas son sin a tardío cinemáticas respecto de D3, un evento de plegamiento y desarrollo de foliación de edad ordovícica temprana.; The main objective of this thesis was focused on the study of petrology relations between pegmatites and surrounding rocks located at the north of Renca batholith, San Luis province, to establish connections with the parental magma that originated them. Other important aim of this thesis is oriented to classify and infer the metallogenic potential of those pegmatites through mineralogical and geochemical studies. The area of study is located at the center-east part of Sierra de San Luis. Rock outcrops here belong to the Conlara Metamorphic Complex of ediacaran-cambrian ages represented by sequences of banded schists, fine grained schists and in less proportion layers of tourmaline schists and tourmalinites. Also in this area there are outcrops of S-type granites of cambricordovicic estimated ages, composed by La Tapera Pluton, Los Alanices granite and El Peñón granite. Moreover, granites of devonic ages are located in the area, they are Renca and Las Chacras-Potrerillos batholiths. Additionally, along the regional strip denominated Bajo de Véliz-San Felipe-El Morro there is an outcrop of mafic-ultramafic rocks named Las Cañas, whose age is unknown but is estimated to be related to famatinian processes. The studied pegmatites belong to the Villa Praga-Las Lagunas group, Conlara pegmatitic distirct. Pegmatites of LCT (Li, Cs, Ta) signature located in the Conlara Metamorphic Complex and pegmatites with NYF (Nb, Y, F) signature from Las Chacras-Potrerillos batholiths were sampled. This set of pegmatites is granitic and it is concordant and discordant with the host rock. They have simple mineralogy composed by quartz, microcline, albite and muscovite as main minerals. Accessory minerals are beryl, tourmaline, garnet, apatite and zircon, in some cases there are spodumene and columbite. Most of these pegmatites have zonation with a core, intermediate, wall and border zone. All available geological features including muscovite and feldspar geochemistry were carried out in these pegmatites to classify them, and they were grouped in rare elements class, RELLi subclass (Rare Elements-Lithium), beryl and complex type and barren for pegmatites of LCT petrogenetic family and in rare elements class, REL-REE (Rare Elements-Rare Earth) subclass, allanite-monacite type, to the only pegmatite of NYF petrogenetic family analyzed. This information was useful to infer the fraccionation of the pegmatites. To the moment it is scarce the Nb-Ta and spodumene mineralization in these pegmatites, but some of them have compatible characteristics with this kind of minerals that have been described in others pegmatites near this area. The X ray diffraction carried out in feldspars indicate a high ordering degree and triclinicity, compatible with low microcline. In some cases, it was observed that the lowest degree of triclinicity obtained in feldspar would correspond with pegmatites of smaller volume and dike morphology. Petrographic, chemical (EPMA: electron microprobe analyzer) and isotopic (SIMS: secondary ion mass spectrometry) analyses carried out in tourmaline from NYF and LCT pegmatites, Los Alanices granite, tourmaline schist and tourmalinite from Conlara Metamorphic Complex led to study compositional and isotopic variations in each crystal. They were grouped as belonging to the schorl-dravite series according to the chemical composition. The boron content that led the crystallisation of tourmaline in the pegmatites studied would be related to the partial fusion of metasediments of the Conlara Metamorphic Complex. Chemical and isotopic data indicate that these rocks would be the source of the muscoviticbiotitic leucomonzogranites and monzogranites from which pegmatitic liquids would derivate. The contribution of boron to that original granite melt would come from the micas that participated in the partial fusion reactions and probably also from reactions involving tourmaline. The P and T conditions necessary for partial melting were achieved at a nonexposed cortical level. The presence of mafic rocks of probable ordovician ages such as the gabbro de las Cañas could indicate a possible heat source. The cooling ages of the LCT pegmatites suggest a common cooling history with the metamorphic host rocks. The relation of the emplacement/deformation indicates that these pegmatites are syn to post kinematic with respect to D3, an early folding and foliation development event of the early ordovician age.

Paisajes agrarios del segundo milenio de la era en el sector norte del Valle de Tafí (Tucumán, Argentina); Agrarian landscape of the second millennium in the northern area of Tafi Valley (Tucumán, Argentina) Franco Salvi, Valeria Leticia; Molar Becchio, Rocío María Este artículo se propone discutir los resultados de investigaciones arqueológicas realizadas en el sector Norte del valle de Tafí, enfocándonos específicamente en evidencias de las actividades agrícolas correspondientes a la primera mitad del segundo milenio de la Era Cristiana. Durante este período el paisaje agrario se transforma segregándose del sector de viviendas, lo que ha generado diversas explicaciones en la literatura arqueológica del Noroeste Argentino. Hemos llegado a la conclusión preliminar de que el valle adquiere una lógica espacial que es propia de este período en la región, pero que no habría sido originada por los factores que la arqueología tradicional suele atribuirle, esto es, la presión demográfica, conflictos o cambios ambientales.; This paper proposes to discuss the results of archaeological research carried out in the northern sector of the Tafi valley, specifically focusing on evidences corresponding to the first half of the Second Millennium of the Christian Age. During this period, the agrarian landscape is segregating of household area which has generated several explanations in the archaeological literature of the Northwest Argentina. We came to the preliminary conclusion that the valley acquires a spatial logic, typical of this period in the region, but would not have been caused by factors that traditional archaeology usually attribute, this are population pressure, conflict or environmental changes.

Towards a situated ethics of care: Some moral dilemmas around aspects of care in an unequal society Faur, Eleonor Carol; Tizziani, Ania This article analyses moral dilemmas around aspects of care from gender and class perspectives. Based on quantitative data and qualitative research for the surrounding area of Buenos Aires, we probe how contemporary women and men in Argentina organise, experience and perceive the relationship between working life and their responsibilities for caring for family members. A situated ethics of care, as explored in the article, reinforces the notion that care is always contextual – it can only be understood within a social and political milieu – and presents distinctions among subjects that hold unequal positions in class and gender hierarchies.

Temáticas, geografías y debates en el campo de la pedagogía de la alternancia; Topics, geographies and discussions in the field of pedagogy of alternation Miano, María Amalia; Lara Corro, Erik Said En este artículo mapeamos la producción teórica elaborada en los últimos siete años sobre la pedagogía de la alternancia, con el fin de exponer un estado del conocimiento actual en este ámbito. Metodológicamente, el mapeo siguió dos ejes: (a) la agrupación semántica de las producciones de acuerdo con las temáticas recurrentes para dar cuenta de qué se ha estudiado y los tipos de producciones, y (b) el agrupamiento con un enfoque geográfico para reconstruir la cantidad de producciones y temáticas recurrentes por país. Nuestros resultados muestran que este campo de investigación aloja perspectivas muy diversas e incluso contrapuestas, entre las que pueden identificarse los polos "pedagogía de la alternancia y emancipación" y "pedagogía de la alternancia y sujeción".; We map the theoretical production elaborated in the last seven years on the Pedagogy of Alternation, in order to expose a state of current knowledge in this field. The mapping followed two axes: (a) the semantic grouping of the productions according to the recurrent themes to account for what has been studied and the types of productions, and (b) the grouping with a geographic focus to reconstruct the quantity of productions and recurrent themes by country. The analysis shows that the field of pedagogy of alternation has diverse and opposing perspectives, in which highlight the poles “pedagogy of alternation and emancipation” and “pedagogy of alternation and subjection”

Liftings of Jordan and super Jordan planes Andruskiewitsch, Nicolas; Angiono, Iván Ezequiel; Heckenberger, Istvan We classify pointed Hopf algebras with finite Gelfand-Kirillov dimension whose infinitesimal braiding has dimension 2 but is not of diagonal type, or equivalently is a block. These Hopf algebras are new and turn out to be liftings of either a Jordan or a super Jordan plane over a nilpotent-by-finite group.

Electrical effective parameters of the grains and the Montgomery's method in Bi 1.65Pb 0.35Sr 2Ca 2.5Cu 3.5O y ceramics Cruz García, A.; Fernández Gamboa, J. R.; Altshuler, E.; Jardim, R. F.; Vázquez Robaina, Odin; Muné, P. In this paper we have applied the Montgomery's measurement method to Bi 1.65Pb 0.35Sr 2Ca 2.5Cu 3.5O y ceramic samples, to study the behavior of the grains? electrical effective parameters, such as: intrinsic effective anisotropy, t= ρc/ ρa b, the slope of the linear part in the temperature dependence of the ab-planes resistivity, Aa b= Δρa b/ ΔT, the weak links resistivity, ρw l, and the orientation probability of the grains? a-axes along a certain preferential direction, γx a. Here, ρa b, ρc and T are the main values of the resistivitity tensor and the measurement temperature, respectively. The samples were pressed uniaxially at three different compacting pressures and extracted from the pellets by cutting an slab along the cylinder axis. Samples cut in this way, exhibit almost an isotropic behavior in the transport properties. Moreover, the sample extracted from the pellet compacted at 488 MPa exhibits the best inter and intragranular properties. The effective intrinsic anisotropy of its grains has the lowest value in the sample set. These results can be used in the fabrication of this superconducting material for certain applications.

Vías de retorno. Exploraciones sociológicas sobre los efectos del encarcelamiento en la vida en libertad y el reingreso a prisión Barukel, Guillermina En el marco de una investigación en curso que pretende avanzar sobre la temática de los efectos del encarcelamiento en el retorno a la vida en libertad y el reingreso a prisión, pre-sentaré una sistematización de las ideas centrales construidas hasta el momento sobre el tema. A partir de entender al encarcelamiento como la cristalización de un proceso más largo que atraviesan los sujetos que el sistema penal captura, describiré y analizaré las reconstrucciones y percepciones de varones adultos que han estado presos más de una vez sobre sus trayectorias de vida, haciendo foco en lo señalado sobre el lugar ocupado por el encarcelamiento, los efectos que tuvo en su retorno a la vida en libertad y el vínculo que establecen con volver a prisión