Improved biomechanical metrics of cerebral vasospasm identified via sensitivity analysis of a 1D cerebral circulation model Melis, A.; Moura, F.; Larrabide, Ignacio; Janot, K.; Clayton, R. H.; Narata, A.P.; Marzo, A. Cerebral vasospasm (CVS) is a life-threatening condition that occurs in a large proportion of those affected by subarachnoid haemorrhage and stroke. CVS manifests itself as the progressive narrowing of intracranial arteries. It is usually diagnosed using Doppler ultrasound, which quantifies blood velocity changes in the affected vessels, but has low sensitivity when CVS affects the peripheral vasculature. The aim of this study was to identify alternative biomarkers that could be used to diagnose CVS. We used a 1D modelling approach to describe the properties of pulse waves that propagate through the cardiovascular system, which allowed the effects of different types of vasospasm on waveforms to be characterised at several locations within a simulated cerebral network. A sensitivity analysis empowered by the use of a Gaussian process statistical emulator was used to identify waveform features that may have strong correlations with vasospasm. We showed that the minimum rate of velocity change can be much more effective than blood velocity for stratifying typical manifestations of vasospasm and its progression. The results and methodology of this study have the potential not only to improve the diagnosis and monitoring of vasospasm, but also to be used in the diagnosis of many other cardiovascular diseases where cardiovascular waves can be decoded to provide disease characterisation.

Faceted patterns and anomalous surface roughening driven by long-range temporally correlated noise Alés, Alejandro; López, Juan M. We investigate Kardar-Parisi-Zhang (KPZ) surface growth in the presence of power-law temporally correlated noise. By means of extensive numerical simulations of models in the KPZ universality class we find that, as the noise correlator index increases above some threshold value, the surface exhibits anomalous kinetic roughening of the type described by the generic scaling theory of Ramasco et al. [Phys. Rev. Lett. 84, 2199 (2000)]. Remarkably, as the driving noise temporal correlations increase, the surface develops a characteristic pattern of macroscopic facets that completely dominates the dynamics in the long time limit. We argue that standard scaling fails to capture the behavior of KPZ subject to long-range temporally correlated noise. These phenomena are not not described by the existing theoretical approaches, including renormalization group and self-consistent approaches.

Efficiency of food utilization by Dichroplus maculipennis (Orthoptera: Acrididae: Melanoplinae) on four crop plants under controlled conditions Mariottini, Yanina; Lange, Carlos Ernesto; Cepeda, R.; de Wysiecki, Maria Laura The aim of this study was to analyze the food utilization efficiencies and the relative growth and consumption rates of different developmental stages and sexes of D. maculipennis under controlled conditions on wheat, oat, corn, and soybean plants, important crops in the Pampas region of Argentina. As expected from a polyphagous species, D. maculipennis was observed to consume all four of the plant species offered. Nevertheless, the consumption of both nymphs and adults was differentiated. Oat and wheat were more consumed than corn and soybean. Females presented higher consumption rates (384.6 ± 30.64 mg/individual/day) than males (278.71 ± 24.26 mg/individual/day). Adult females had the highest growth rate, followed by nymphs of the same sex, and then adult males. The highest values of ECI and ECD were obtained in soybean; females had higher values of food efficiencies than males, and nymphs had greater values than adults. In relation to this, soybean was the highest quality food; the amount of nitrogen present in soybean was approximately twice that found in the other species. The nutritional needs of D. maculipennis might have been satisfied by feeding on low quantities of soybean, which is, among the food offered, the most “nutritionally balanced food”.

Textural, pasting, and rheological behavior of starch‐pectin‐sucrose gels: Relation with sensory perception Lotufo Haddad, Agustina Marcela; Ribotta, Pablo Daniel; Armada de Romano, Margarita; Goldner, Maria Cristina The aims of this research were: (1) to analyze textural, pasting and rheological characteristics of gels made with Andean potato starch (APS) compared with commercial potato starch (CPS); (2) to assess the sensory texture features; and (3) to relate instrumental behavior to human perception. Ten starch-pectin-sucrose systems were elaborated: five with CPS and five with APS (at 2.5-3.5-4.5-5.5-6.5% starch concentrations), and characterized by textural profile analysis (TPA), back extrusion test (BET), rapid-visco analyzer (RVA), oscillatory tests and sensory analysis. The systems had a weak gel behavior. The samples having the lowest concentrations of both starches were associated with springiness, while those with the highest concentrations were associated with sensory firmness, gumminess, chewiness, consistency, PV and G´. From 5.5%, effect of starch type was more important on gels behavior. Spreadability was the variable mostly affected by starch type and concentration.

Vanillin as a natural cross-linking agent in chitosan-based films: Optimizing formulation by response surface methodology Tomadoni, Bárbara María; Ponce, Alejandra Graciela; Pereda, Mariana; Ansorena, Maria Roberta One way of improving mechanical and water barrier properties of chitosan films is through cross-linking reactions. Cross-linking agents usually used for this purpose include glutaraldehyde, glyoxal, and formaldehyde, which may cause some undesirable side effects and are consider health hazards. Hence, the objective of this work was to optimize the formulation of chitosan (CH) films with vanillin as a natural antioxidant cross-linking agent, to simultaneously improve their physical, barrier, antioxidant and mechanical properties. Three parameters were studied at three levels: vanillin content (0, 25 and 50% w/w chitosan), glycerol content (30, 45 and 60% w/w chitosan) and drying temperature (35, 50 and 65 °C). Response surface methodology (RSM) and desirability function (D) were used to find the levels of each factor that simultaneously optimize different properties of the films: opacity value, total soluble matter (TSM), Young modulus (YM), T0 and Tmax parameters (obtained from thermogravimetric analysis), water vapor permeability (WVP), total phenolic content (TPC) and antioxidant capacity by DPPH method. Fifteen formulations combining the studied factors were prepared according to a Box-Behnken design. An optimal chitosan film formulation was found, with vanillin content of 37.5% (w/w of CH), glycerol content of 45% (w/w of CH) and drying temperature of 57.5 °C. RSM approach using the desirability function was found to be an effective tool to investigate changes in films properties and to search for the optimal active chitosan film formulation with a natural cross-linking agent, such as vanillin.

Innovación tecnológica en la cadena de producción de ropa en Argentina: Cuando las apariencias engañan; Inovação tecnológica na cadeia de produção de roupas na Argentina: Quando as aparências enganam; Technological innovation in the clothing production chain in Argentina: When appearances deceive Ludmer, Gustavo El presente estudio analiza la situación reciente de la innovación tecnológica en la cadena de producción de ropa en Argentina. La metodología utilizada combina métodos cuantitativos (análisis de las estadísticas disponibles) con cualitativos (entrevistas a informantes claves de la cadena), al tiempo que se realiza una exhaustiva revisión de la bibliografía existente en la materia. La investigación permite concluir que la industria de confección de indumentaria muestra escasos esfuerzos en innovación tecnológica, tanto en Argentina como en el mundo. Sin embargo, si se incluye en el análisis a todos los eslabones de la cadena de producción, en especial a las marcas, es posible observar otra realidad. Nuestro país posee destacadas capacidades de innovación en la cadena de producción de ropa, basadas principalmente en el diseño de nuevos productos por parte de trabajadores de alta calificación (diseñadores profesionales), reconocidos a nivel internacional. En contraste con este segmento, el trabajo verificó la presencia de una trampa de baja productividad en los talleres de confección que permanecen en la informalidad.; O presente estudo analisa a recente situação de inovação tecnológica na cadeia de produção de vestuário na Argentina. A metodologia utilizada combina métodos quantitativos (análise de estatísticas disponíveis) e qualitativas (entrevistas com informantes-chave da cadeia), enquanto uma revisão exaustiva da bibliografia existente sobre o assunto é realizada. A investigação permite concluir que a indústria de fabricação de vestuário mostra pouco esforço em inovação tecnológica, tanto na Argentina como no mundo. No entanto, se todos os links na cadeia de produção estão incluídos na análise, especialmente marcas, é possível observar outra realidade. Nosso país tem excelentes capacidades de inovação na cadeia de produção de roupas, com base principalmente no design de novos produtos por profissionais altamente qualificados (designers), reconhecidos internacionalmente. Em contraste com este segmento, o trabalho verificou a presença de uma armadilha de baixa produtividade nas fábricas de vestuário que permanecem informais.; The present study analyzes the recent situation of technological innovation in the clothing production chain in Argentina. The methodology used combines quantitative methods (analysis of available statistics) with qualitative ones (interviews with key informants of the chain), while an exhaustive review of the existing bibliography on the subject is carried out. The investigation allows to conclude that the apparel industry shows little efforts in technological innovation, both in Argentina and in the world. However, if all the links in the production chain are included in the analysis, especially brands, it is possible to observe another reality. Our country has outstanding innovation capabilities in the clothing production chain, based mainly on the design of new products by highly qualified workers (professional designers), internationally recognized. In contrast to this segment, this study verified the presence of a trap of low productivity in the clothing factories that remain informal.

Relevamiento territorial de los pueblos indígenas Cardin, Lorena El gobierno nacional sostiene que para garantizar el derecho al territorio de los Pueblos indí-genas lleva adelante el Programa Relevamiento Territorial de Comunidades Indígenas (Progra-ma ReTeCI), creado por la ley nacional nro. 26.160, Ley de Emergencia en Materia de Posesión y Propiedad de las Tierras que tradicionalmente ocupan las Comunidades Indígenas origina-rias del país.2 Afirma, asimismo, que se trata de una herramienta fundamental para revertir la historia de invisibilización, despojo y discriminación que vienen padeciendo los Pueblos indígenas.3 En este trabajo presentaré, sin embargo, un caso en el cual el Relevamiento Terri-torial de las Comunidades Indígenas (RETECI) inculcó dicho derecho. Reflexionaré sobre los riesgos que conlleva la ley para el reconocimiento del derecho al territorio indígena cuando la conformación de las relaciones de fuerza de los actores involucrados resulta significativamen-te adversa a las comunidades indígenas.; The federal government sustains that in order to guarantee the territory right of indigenous Peoples it carries out the Territorial Survey Program of Indigenous Communities (ReTeCI Program), created by the national law no. 26,160 Ley de Emergencia en Materia de Posesión y Propiedad de las Tierras que tradicionalmente ocupan las Comunidades Indígenas originarias del país. It also states that it is a fundamental tool to reverse the history of invisibility, dispossession and discrimination that indigenous Peoples have been suffering. In this paper I will present, however,a case in which the territorial survey instilled that right. I will reflect on the risks that the law entails for the recognition of the right to indigenous territory when the conformation of the force relations of the actors involved is significantly adverse to the indigenous communities. Key Words: Territorial survey, rights, territory, indigenous Peoples

Purification of alginate improves its biocompatibility and eliminates cytotoxicity in matrix for bone tissue engineering Torres, María Luz; Fernandez, María José; Dellatorre, Fernando Gaspar; Cortizo, Ana María; Oberti, Tamara Gisela There is a growing interest about using natural polymers from renewable sources as biomaterials for applications in tissue engineering. In the present work, alginates were extracted from Undaria pinnatifida, a brown sea weed invasive in Argentinian coast. The isolated alginate was structurally characterized by IR and 1H NMR spectroscopies, intrinsic viscosity and TGA. For comparison purposes, commercial sodium alginate was purified and characterized using the same protocol as for raw material. Toxicity and biocompatibility of sodium alginate obtained from algae were studied using a murine macrophage-like cell line (RAW 264.7) and bone marrow stromal cells (BMSC), respectively. The presence of impurities inhibited both RAW 264.7 and bone marrow stromal cell proliferation and increased nitric oxide production from macrophages, while inhibited osteoblastic differentiation of BMSC. All these effects were reverted by the purification of alginate. In conclusion, alginate purification improves biocompatibility and osteo-induction while decreases its toxicity.

Changes in forest diversity over a chronosequence of fluvial islands Brumnich, Federico; Marchetti, Zuleica Yael; Pereira, María Soledad The high environmental heterogeneity of large fluvial systems is reflected by the co-existence of contrasting plant communities and landforms. The main objective of this study was to assess the forest diversity changes in islands of the Middle Paraná River (Argentina) in order to discuss an integrative question: how synchronized are the major changes in the features of islands and forests? Persistence age, elevation and flood regime of 11 main channel islands were determined. Variables related to the vascular plant community and the tree stand structure of forests were also measured in 400 m2 plots. Islands were classified as young or old (YIs or OIs), according to their persistence age, which ranged from two to 108 years. Both island classes differed in their elevation but not in the proportion of low water phase. Only three out of nine tree species were dominant: Tessaria integrifolia and Croton urucurana (restricted to YIs and OIs, respectively), and Salix humboldtiana (distributed in both island classes). Alpha diversity was positively correlated with the age of the YIs and reach the highest value in the oldest island forest. Beta diversity was mainly due to processes of species replacement which differentiate floodplain forests. Gamma diversity reached 101 species, being the perennial herbs aclear majority. The stand structure and the complete floristic composition were significantly different between YIs and OIs, with three and seven indicator species of each island class, respectively. Considering integrative models ofsuccession, our findings suggest that the biogeomorphic phase, recognised by the fluvial biogeomorphic model, prevailed in the whole range of island persistence ages. Therefore, it seems that the increase in forest diversity in a large river is restricted to spatial refugia defined by major hydrogeomorphic shifts.

Evaluation of a modified hydrocyclone as electrochemical reactor for processing of two-phase (gas-liquid) systems Colli, Alejandro Nicolás; Fornes, Juan Pablo; González Pérez, Omar; Bisang, Jose Maria A standardised hydrocyclone is examined as analternative reactor for the electrochemical processing of two-phase systems.Experimental measurements and computational predictions of residence timedistributions demonstrate an appropriate hydrodynamics of the equipment. A mainpeak near the mean residence time was detected revealing that a fluid by-pass ordead regions are absent and the Peclet number, obtained by correlation of theexperimental data, was higher than 9. Mass-transfer measurements made by usinga segmented, or a grooved or a smooth cathode corroborate the good performanceof the cylindrical body of the hydrocyclone. The presence of the gas phase has littleinfluence on the residence time distribution as well as on the mass-transferbehaviour of this device. Sulphurdioxide reduction to colloidal sulphur was used as a test reaction to check theperformance of the reactor. The best results were obtained at a cathodicpotential of -0.5 V, against a saturated calomelelectrode, where hydrogen evolution is not possible as a cathodic side reaction.Thus, a 56% current efficiency with a specific energy consumption of 20.4 kWh kg-1 and a space time yield of 10.4 kg m-3 h-1 were attainedunder a two-phase flow of 5% SO2 in nitrogen. The sulphur particles obtainedfrom the spigot present an average size of 6.7 ìm being those carried by theoverflow stream smaller, both of them of high purity.

Upgrading the nutritional value of rice bran by Solid-State fermentation with pleurotus sapidus Omarini, Alejandra Beatriz; Labuckas, Diana Ondina; Zunino, María Paula; Pizzolitto, Romina Paola; Fernández Lahore, Marcelo; Barrionuevo, Luis Damian; Zygadlo, Julio Alberto Solid-state fermentation (SSF) of rice bran (RB) employing the edible fungus Pleurotus sapidus was investigated as a process strategy to improve the nutritional quality of this low-cost and abundant substrate. During fermentation, samples were withdrawn at different time intervals (4, 6, and 10 days) and further analyzed. Established methods were deployed to monitor the changes in nutritional composition (carbohydrates, proteins, ash, and lipids). Additionally, changes in fatty acid composition was studied as a function of culture progress. Results showed that the SSF of rice bran increased total carbohydrates from 36.6% to 50.2%, total proteins from 7.4% to 12.8%, and ash from 7.6% to 11.5%. However, the total lipid content was reduced from 48.5% to 27.8%. The fatty acid (FA) composition of RB included mainly oleic, linoleic, and palmitic acids. Upon fermentation with P. sapidus, small differences were found: linoleic acid and oleic acid content were increased by 0.4% and 1.1%, respectively, while palmitic acid content was reduced by 0.8%. This study demonstrated an improvement in the nutritional quality of RB after fermentation with P. sapidus, since protein, carbohydrates, minerals, and specific FA components were increased. As a whole, our results indicate that fermented rice bran could be used as a high-quality animal feed supplement.

Sobre algunas derivas de la narrativa salteña reciente Sosa, Carlos Hernán A partir de la década del 2000, en el campocultural salteño al igual que otros ámbitos del país, se observa la labor deformaciones culturales, cuyas prácticas socioculturales modifican sensiblemente las tradiciones locales en materia de producción y circulación literarias. En este sentido, me interesa detenerme en la producción narrativa de algunos autores representativos, con el propósito de puntualizar en estrategias discursivas visibles en el corpus literario que alteran las tradiciones narrativas previas; en materia de opciones temáticas, de géneros literarios "menores" recuperados y la incorporación de aportes provenientes de las diversas formas de la cultura popular. El estudio de estas transformaciones resulta útil para evaluar la incidencia que dejan estas producciones en la narrativa salteña actual, y permite seguir pensando los distintos entramados que articulan el campo cultural salteño con otros centros con los cuales se establecen zonas de contacto (con aristas epigonales y polémicas).

Eficiencia Energética: un estudio del marco habilitante en Argentina Zabaloy, María Florencia El progreso económico y social de una economía se encuentra íntimamente ligado a la disponibilidad de recursos energéticos, su calidad, su precio y a las consecuencias que generan sobre el medio ambiente, entre otros. El acceso a la energía es tan relevante para la vida humana que se la ha considerado en los Objetivos del Desarrollo Sostenible (ODS) de Naciones Unidas del año 2015, en particular en el ODS 7 que establece: “Garantizar el acceso a una energía asequible, segura, sostenible y moderna para todos”. Las políticas de Eficiencia energética (EE) juegan un rol clave en alcanzar dicho objetivo, ya que permiten disminuir la demanda energética, mejorar la seguridad de abastecimiento y reducir el impacto ambiental del consumo energético. En este contexto, el objetivo del presente trabajo es analizar cuáles han sido las condiciones de entorno, las barreras y los instrumentos que han permitido el desarrollo de las políticas de EE en el sector residencial en la Argentina. Como conclusión se encuentra que las barreras económico-financieras son muy fuertes y a su vez las condiciones macro-económicas no muestran un buen desempeño. Por otro lado, existen numerosas barreras institucionales y condiciones de borde institucionales que dificultan el desarrollo de medidas de EE.

The hidden value of artisanal fisheries in Honduras Canty, Steven; Funes, Manuela; Box, Stephen; Zylich, Kyrstn; Derrick, Brittany; Divovich, Esther; Lindop, Alasdair; Pauly, Daniel; Zeller, Dirk Declining fisheries catches are a global trend, with management failing to keep pace with growth in fishing effort and technological advances. The economic value of Honduras’ catches was estimated within the industrial and artisanal sectors. Catches were found to be 2.9 times greater than the official statistics between 1950 and 2015. The merging of industrial and artisanal catch data masked the decline in indus‐ trial catches and hid the strong growth of artisanal fisheries. In 1996, annual artisanal fisheries landed catches surpassed the industrial fishery sector, and in 2000, the an‐ nual net value of artisanal fisheries eclipsed the value of the industrial fisheries. These data highlight the importance of artisanal fisheries in Honduras and challenge the long‐held belief that the industrial sector contributes more to the national economy. The global paucity of fisheries data highlights the need for comprehensive strategies to collect more detailed and accurate fisheries data.

Volver a las exequias de Paine Güor: Análisis sociocultural del kalkutun o agresión mágica entre los rankülche de mediados del siglo XIX; Back to the funerals of Paine Güor. Socio-cultural analysis of the kalkutun or magical aggression among mid-19th century rankülche Garcia Insausti, Joaquin Tomas Según el relato de Santiago Avendaño, como parte de las exequias del cacique rankülche Paine-Güor, fueron asesinadas treinta y tres mujeres por ser brujas o viudas. En un análisis pionero, Alberto Rex González interpretó el sacrificio de una de las viudas del cacique como un caso de suttee, indicador del nivel de complejización sociopolítica alcanzado por las sociedades indígenas pampeanas. En este trabajo pretendemos releer estos acontecimientos con la intención de indagar acerca de las causas que permitirían explicar el asesinato masivo de brujas, aspecto que según González solamente poseía un significado ritual como parte del funeral. A tal fin, conceptualizaremos las nociones nativas sobre la agresión mágica para dar cuenta de los sentidos y obligaciones sociales implicados en el contexto específico vivido por los rankülche durante la década de 1840, además de examinar el único caso análogo de ejecución de brujos a gran escala registrado en la región pampeana.; According to Santiago Avendaño’s account, as part of the funeral of rankülche’s chief Paine-Güor, thirty-three women were executed because they were witches or widows. In a groundbreaking analysis, Alberto Rex González interpreted the sacrifice of one of the chief’s widows as a case of suttee, an indicator of the political organization level achieved by the pampean indigenous societies. In this paper we intend to re-read these events to clarify the causes that could explain the mass murder of witches, which according to Gonzalez only had a ritual meaning as part of the funeral. To this end, we conceptualize the native notions about magical aggression in order to account for the senses and social obligations involved in the specific context of 1840’s rankülche society, and also examine the only analogous case of large-scale execution of witches recorded in the pampean region.

Afectividad, fe religiosa y militancia contestataria en las ramas especializadas de Acción Católica en Bahía Blanca (1967-1975) Dominella, Virginia Lorena El artículo aborda los cruces entre religión, política y afectividad en las experiencias de los integrantes de la Juventud Universitaria Católica, la Juventud Obrera Católica y la Juventud Estudiantil Católica en Bahía Blanca en el período 1967-1975. Se interroga sobre el papel que desempeñaron las emociones en las trayectorias militantes de estos jóvenes; en particular, el lugar del amor en la sociabilidad católica y en el paso a la militancia contestataria. En este sentido, reflexiona en torno a los siguientes interrogantes: ¿qué rol jugaron diversos tipos de amor en la militancia eclesial y en el activismo social y político de los actores? ¿Cómo se moldeó el vínculo de amistad al interior de los grupos cristianos? ¿Qué significados asignaban al amor y de qué manera edificaban relaciones de pareja los jucistas, jocistas y jecistas? ¿Cómo funcionó el amor en relación a la política y frente a los desafíos que ésta planteaba?.; The article addresses the intersections of religion, politics and affectivity in experiences of the members of Juventud Universitaria Católica, Juventud Obrera Católica and Juventud Estudiantil Católica in Bahía Blanca, from 1967 through 1975. The role that the emotions of the militant trajectories of these young people had is questioned; particularly, the role of love in the catholic socialisation and how did it lead to an anti-establishment militancy. In this sense, it reflects over the following questions: what role the diverse types of love in the ecclesiastic militancy and the social and political activism of the parties played? How was the friendship bond formed on the inside of the Christian groups? Which meanings were assigned to love and how partnerships were built by the Jucists, Jocists and Jecists? How did love work in relation to politics and facing the challenges presented by it?.

Petrografía y geoquímica de traquibasaltos y traquiandesitas basálticas de las Vulcanitas Corona Chico y del Complejo Volcánico Barril Niyeu, noroeste de la Meseta de Somuncurá, provincia de Río Negro Asiain, Lucia Montserrat; Gargiulo, Maria Florencia; Bjerg, Ernesto Alfredo; Ntaflos, Theodoros; Reitinger, Johann En esta contribución se documentan las características petrográficas y geoquímicas de coladas lávicas expuestas en el sector noroeste de la Meseta de Somuncurá, correspondientes a la unidad Vulcanitas Corona Chico y a la facies básica del Complejo Volcánico Barril Niyeu (Superunidad Quiñelaf), ambas adjudicadas por varios autores al evento volcánico post-plateau. Las coladas lávicas estudiadas poseen predominantemente textura afírica seriada a microporfírica con microfenocristales de olivino y plagioclasa, en una pasta integrada por plagioclasa, olivino, clinopiroxeno, minerales opacos y apatito. Químicamente estas rocas se clasifican como traquibasaltos y traquiandesitas basálticas de la suite alcalina sódica, con señal geoquímica similar a OIB y con anomalía relativa positiva de Ba. Sobre la base de trabajos de relevamiento de campo, estudios petrográficos y los primeros datos geoquímicos de roca total para la unidad Vulcanitas Corona Chico presentados en esta contribución, se propone ampliar la caracterización de estaunidad informal, incorporando coladas de lava ampliamente distribuidas en el sector noroccidental de la meseta. Asimismo, se plantea homogeneizar y simplificar la nomenclatura de las unidades volcánicas referidas al evento post-plateau en el sector noroccidental de la meseta. De este modo, teniendo en cuenta que el evento post-plateau presenta variaciones composicionales, se recomienda hacer referencia a las unidades volcánicas utilizando nombres formacionales o de complejos volcánicos según corresponda, limitando eluso de los términos plateau y post-plateau únicamente para indicar la temporalidad de tales eventos volcánicos.; Petrography and geochemistry of trachy-basalts and basaltic trachy-andesites of Vulcanitas Corona Chico unit and the Barril Niyeu Volcanic Complex from the northwestern Meseta de Somuncurá, Río Negro province. The petrographic and geochemical characteristics of exposed lava flows in the northwest sector of Meseta de Somuncurá, corresponding to the Vulcanitas Corona Chico unit and the basic facies of the Barril Niyeu Volcanic Complex (Quiñelaf Superunit), are presented in this contribution. Both, the Vulcanitas Corona Chico unit and the Barril Niyeu Complex, were attributed by several authors to the post-plateau volcanic event. Their dominant texture is aphyric seriate to microporphyric with olivine and plagioclase microphenocrysts in a groundmass of plagioclase, olivine, clinopyroxene, opaque minerals and apatite. Accordingly with their chemical features, these rocks classify as trachy-basalts and basaltic trachy-andesites of the sodic alkaline suite, with OIB-type geochemical signature and a relative positive anomaly in Ba. Based on field data, petrography and the first whole-rock geochemical data of the Vulcanitas Corona Chico presented in this contribution, it is proposed to expand the definition of this informal unit incorporating some of the lava flows from the northwestern part of Meseta de Somuncurá. Likewise, it is proposed to homogenize and simplify the nomenclature of the post-plateau units in the northwestern sector of the Meseta. Therefore, considering that the post-plateau event shows compositional variations, it is recommended to refer to the volcanic units using their formational or volcanic complex names, limiting the use of plateau and post-plateau only to indicate the temporality of these volcanic events.

The dietary lipid content affects the tissue gene expression of muscle growth biomarkers and the GH/IGF System of pejerrey (Odontesthes bonariensis) juveniles Gomez Requeni, Pedro; Kraemer, Mauricio Nestor; Canosa, Luis Fabian Gene expression of growth hormone receptors (GHRs), insulin-like growth factors (IGFs), myostatin (MSTN) and myogenin (MyoG) was analyzed in juveniles pejerrey fed with graded levels of lipids (L): 6% (L6), 10% (L10), 25% (L25). After 14 weeks, no changes were found in liver GHR-I GHR-II and IGF-II mRNA levels whereas IGF-I decreased in L10 and L25. Muscle GHR-I gene expression increased in L25 whereas GHR-II, IGF-II and MyoG were higher in L6. IGF-I and MSTN expression was not affected by the different diets. Adipose IGF-I mRNA levels decreased in L10. Correlations between body weight and members of GH/IGF system in liver and skeletal muscle were found only in L10 group. Correlations found in L10 group between both liver and skeletal muscle GHR-I and IGF-I were lost in either L6 or L25 groups. Thus, fish fed with apparently unbalanced dietary lipid contents (6% and 25%) exhibit a compensatory regulation of systemic and local components of the GH/IGF axis. Furthermore, the marked inhibition of muscle MyoG gene expression in L25 might limit excessive lipid deposition and fish growth. Our data suggest that a dietary lipid contents of 10% would promote a particular adjustment of the endocrine and autocrine/paracrine GH/IGF system, stimulating body growth and perhaps muscle hyperplasia. On the other hand, a higher dietary lipid content would uncouple the GH/IGF system, reducing hepatic IGF-I, while slightly increasing hepatic GHR-I, probably to prompt lipolysis.

A Receding Horizon Framework for Autonomy in Unmanned Vehicles Murillo, Marina Hebe; Sanchez, Guido Marcelo; Genzelis, Lucas Manuel; Deniz, Nestor Nahuel; Giovanini, Leonardo Luis In this article we present a unified framework based on receding horizon techniques that can be used to design the three tasks (guidance, navigation and path-planning) which are involved in the autonomy of unmanned vehicles. This tasks are solved using model predictive control and moving horizon estimation techniques, which allows us to include physical and dynamical constraints at the design stage, thus leading to optimal and feasible results. In order to demonstrate the capabilities of the proposed framework, we have used Gazebo simulator in order to drive a Jackal unmanned ground vehicle (UGV) along a desired path computed by the path-planning task. The results we have obtained are successful as the estimation and guidance errors are small and the Jackal UGV is able to follow the desired path satisfactorily and it is also capable to avoid the obstacles which are in its way.

Multiple model approach for robust state estimation in presence of model uncertainty and bounded disturbances Deniz, Nestor Nahuel; Murillo, Marina Hebe; Sanchez, Guido Marcelo; Genzelis, Lucas Manuel; Giovanini, Leonardo Luis In the present work, an optimization-based algorithm for state estimation under model uncertainty and bounded disturbances is presented. In order to avoid to solve a non-convex optimization problem, model and state estimation problems are divided into two convex formulations which are solved within a fixed-point iteration scheme with standard available solvers. Guaranty of robust global stability is given for the case of bounded disturbances and uncertainty, and convergence to the true system and vector state are given for the case of vanishing disturbances.