Localizing and quantifying the intra-monomer contributions to the glass transition temperature using artificial neural networks Miccio, Luis Alejandro; Schwartz, Gustavo A. We used fully connected artificial neural networks (ANN) to localize and quantify, based on the monomer structure of several polymers, the specific features responsible for their observed glass transition temperatures (Tg). The use of ANNs allows us not only to successfully predict the Tg of the polymers but, even more important, to understand what parts of the monomer are mainly contributing to it. For this task, we used the weights of a trained ANN as obtained after fitting the input data (monomer structure) to the corresponding Tg value. The study was performed for a set of more than 200 atactic acrylates for which typical Tg defining features were identified. Thus, the ANN is able to recognize the relevance of the backbone stiffness, the length of pending groups or the presence of methyl groups on the value of the glass transition temperature. This approach can be easily extended to many other interesting properties of polymers and it is worth noting that only the monomer chemical structure is needed as input. This method is potentially useful for identifying orthogonal ways of tuning polymer properties during the design and development of new materials and it is expected that it will contribute to a better understanding of the polymer's behavior.

Improvement of water barrier properties of soybean protein isolate films by poly(3-hydroxybutyrate) thin coating Salgado, Pablo Rodrigo; D'amico, David Alberto; Seoane, Irene Teresita; Iglesias Montes, Magdalena Luz; Mauri, Adriana Noemi; Cyras, Viviana Paola The aim of this work was to study the preparation of bilayer films formed by soy protein isolate (SPI) and polyhydroxybutyrate (PHB). This was done using the lowest possible concentration of PHB to improve the functionality of SPI films as food packaging or for agricultural uses, specially reducing their water vapor permeability (WVP). SPI films are environmentally friendly since they are biodegradable and come from renewable sources but they are brittle and have high water permeability. Even for the lowest concentration analyzed, PHB managed to form a homogeneous layer that successfully covered up the SPI film surface. All bilayers films showed a significant reduction of WVP of SPI films, and those with the highest PHB content showed the highest elastic Young's modulus and mechanical strength while maintaining a good elongation and low Tg value, similar to that of SPI. Despite of their hydrophobicity differences, a good adherence of both layers was achieved, which allowed to improve the mechanical and barrier properties of the SPI coated films with respect to films formed by both biopolymers separately. The combination of both SPI and PHB seems to be a good alternative to prepare a biodegradable material taking advantages of the best properties of each component.

Microstrain measurements and damage analysis during tensile loading of intercritical austempered ductile iron Fernandino, Diego Omar; Di Cocco, Vittorio; Boeri, Roberto Enrique; Iacoviello, Francesco The study focuses on the measurement of microstrain and the assessment of damage during tensile loading of intercritical austempered ductile iron by using digital image correlation technique and in situ observations. The results show that the first stages of damage involve the initiation and propagation of cracks along the matrix-nodule interface. By comparing the strain maps retrieved from digital image correlation analysis with the microstructure, plastic deformations were observed to be located preferentially in the ferritic internodular areas. However, for a more advanced stage of damage, cracks are seen to initiate in the metallic matrix at the boundary between ausferrite sheaves and propagate preferentially following the direction of the ausferrite plates. The final fracture shows a mix of quasi-cleavage and ductile morphology. The quasi-cleavage is produced by the nucleation and growth of multiple quasi-cleavage cracks formed on the ausferrite sheaves, while the overloaded ferritic zones are fractured by ductile tearing.

Validación de productos satelitales a partir de mediciones in situ para el monitoreo de coberturas del suelo en el sur de la Región Pampeana (Argentina); Satellite products validation through in situ measurements for monitoring land covers in the south of Pampas (Argentina) Ferrelli, Federico; Brendel, Andrea; Perillo, Gerardo Miguel E.; Piccolo, Maria Cintia La delimitación de las coberturas del suelo es una actividad costosa que requiere de instrumental específico. En este contexto, el objetivo de este estudio fue analizar la precisión y exactitud de productos satelitales de cobertura del suelo con respecto a un mapa confeccionado con mediciones in situ en la cuenca del río Sauce Grande (Argentina). Para ello, se realizaron cinco viajes de campo durante el año 2018 y se tomaron muestras georeferenciadas y firmas espectrales de las coberturas del suelo. Complementariamente, se calcularon índices de vegetación, suelo y agua a partir del procesamiento de imágenes satelitales Landsat 8. Con la reflectancia adquirida a campo y el comportamiento espectral de cada cobertura, se identificaron muestras espaciales necesarias para realizar una clasificación supervisada. Posteriormente, se descargaron los productos MODIS-Landcover y ESA-Landcover y se diseñaron mapas de coberturas del suelo estimadas. Se estableció un tamaño de píxel de 300 m para los tres productos satelitales y se aplicó con una matriz de confusión del tipo pixel por pixel para compararlos. Los resultados permitieron establecer que el MODIS-Landcover es un producto útil para el monitoreo de cultivos y pastizales, mientras que el ESA-Landcover para la expansión urbana y las variaciones del agua superficial.; The study of regional-scale land covers is an expensive activity that requires specific equipment. This work aimed to analyze the precision and the accuracy between satellite products and a land cover map obtained using in situ measurements in the Sauce Grande river basin (Argentina). In order to do so, we carried out five field trips during 2018 to identify land covers. It was studied the reflectance of each class from georeferenced samples acquired with a spectrometer and a GPS. Besides, spectral indices of vegetation, water, and soil were calculated to analyze the spectral behavior of each class. With this information, we delimited regions of interest to perform the supervised method. Subsequently, we downloaded the MODIS and ESA Landcover products. Then, we established a pixel of 300 meters for the three maps with matrix metrics. The Kappa coefficient, the overall accuracy, as well as the user and producer ones, were calculated to evaluate the estimated land cover against the measured ones. Results showed that MODIS-Landcover presents excellent agreements for determining crops and grasslands, while ESA-Landcover for urban expansion and water bodies.

Energy management on battery/ultracapacitor hybrid energy storage system based on adjustable bandwidth filter and sliding-mode control Asensio, Eduardo Maximiliano; Magallán, Guillermo Andrés; de Angelo, Cristian Hernan; Serra, Federico Martin A real-time power-split control strategy for a hybrid energy storage system (HESS) used in electric vehicles is proposed in this work. The HESS topology corresponds to a semi-active ultracapacitor (UC) configuration. The HESS goals are to prevent battery degradation and to preserve its lifetime while improving the system efficiency by supplying the fast dynamics power demands through the UC pack. In order to generate the UC power reference, a digital low-pass filter whose bandwidth is adjusted according to the UC SOC is proposed. This allows a better usage of the UC available energy, while reducing frequent activation of controller protections and avoiding the calculation of the filter cut-off frequency for a certain driving cycle. The low-level control strategy is based on a sliding mode controller combined with a closed-loop current observer, which allows to improve the implementation performance while maintaining the current ripple bounded. Simulation and experimental results were presented showing that the proposed strategy preserves battery health in a more effective way than filter-based strategies with fixed bandwidth, for cases where no future information about the required power is available.

Integrative Taxonomic Analyses Sheds Light on Three Historically Disputed American Spermacoce Species, and a Key to the American Species of Spermacoce (Spermacoceae, Rubiaceae) Nuñez Florentin, Mariela; Florentín, Javier Elias; Salas, Roberto Manuel There has been great confusion between Spermacoce glabra, S. riparia, andS. tenuior since their original descriptions. These species can bedistinguished mostly by their seed features. Clustering and principal coordinate analyses (PCoA) were used to scrutinize the formation of hierarchicalnon-overlapping groups strictly according to the degree of morphological similarity. Thirteen characters were scored for 26 herbariaspecimens. The taxonomic identity of these three species is discussed. Redefined descriptions and illustrations are provided, especially for fruit, seed,and pollen characters. A map and a discussion of the updated geographical distribution of these species are included. A table summarizing thedifferent taxonomic concepts in contemporary floristic studies and an identification key to all American Spermacoce species are also provided. Thenew combination Spermacoce affinis (DC.) R.M. Salas is presented here.

First steps in the formulation of praziquantel nanosuspensions for pharmaceutical applications Martinez, Noelia Anabel; Fernández Álvarez, Fátima; Delgado, Ángel V.; Badillo García, María Luisa; Raba, Julio; Cerutti, Estela Soledad; Arias, José L. Praziquantel (PZQ), a broad spectrum anthelmintic drug, cannot be found in acceptable dosage forms for elderly patients, paediatric patients, and for veterinary use. In fact, very little has been done up to now in the formulation of liquid dosage forms, being they always formulated for parenteral administration. To beat this important challenge, it was accomplished a comprehensive analysis of the influence of two elementary physicochemical aspects, i.e. surface thermodynamic and electrokinetic properties, on the colloidal stability of PZQ nanosuspensions. The hydrophobic character of the drug, intensely determining the flocculation curves, was confirmed by the thermodynamic characterization. The electrophoretic characterization, in combination with the sedimentation and relative absorbance versus time curves, highlighted that the electrical double layer thickness and the surface charge can play an essential role in the stability of the pharmaceutical colloid. Finally, it was demonstrated that controlling the pH values and the incorporation of electrolytes can help in formulating PZQ aqueous nanosuspensions with appropriate stability and redispersibility behaviours for pharmaceutical use.

Maturity Assessment for the Implementation of the First Fishery Regulation in Patagonian Marine Gastropods Cumplido Esmoris, Mariano José; Bigatti, Gregorio In order to establish management measures for a new resource, the size at first maturity should be studied. This measurement is a powerful tool in enabling the sustainable exploitation of marine benthic resources. Patagonian marine gastropods are captured as complementary catches during scallop fisheries. Studies related to the size at first maturity were performed for edible marine gastropods in northern Patagonia and have been used for the creation of the first regulation of gastropod catches made by the Secretary of Fisheries of Chubut Province. The minimum capture size of some of the species included in this regulation was established from preliminary studies but needed histological confirmation. The present study aims to provide accurate information on the size at maturity by an assessment that includes first gonadal maturity and population size/weight data of Buccinanops deformis and Trophon geversianus, two edible species of marine gastropods with high abundance along the Patagonian Atlantic coast and elevated nutritional values in their edible tissues. By histological methods, females of B. deformis reach maturity at 2.8 cm and males at 1.95 cm. While by an alternative histological method (inflexion point method), females reach maturity at 2.76 cm and males at 2.1 cm. For T. geversianus, females reach maturity at 3 cm (inflexion point = 2.38 cm) and males at 1.65 cm (inflexion point = 2.01 cm). The maturity assessment of B. deformis and T. geversianus revealed that males reach maturity at a smaller size than females, probably due to the fact that females require a more gradual process in maturation with a greater reproductive investment. The size at first sexual maturity provides valuable information for establishing the minimum catchable size. Therefore, we estimate a minimum size limit for B. deformis of 3.6 cm and 3.5 cm for T. geversianus and suggest that fishery measurements for these species should be established by performing a particular maturity assessment in each fishery zone.

Impact of land use history on the arbuscular mycorrhizal fungal diversity in arid soils of Argentinean farming fields Ontivero, Roberto Emanuel; Voyron, Samuele; Risio Allione, Lucia Veronica; Bianco, Paolo; Bianciotto, Valeria; Iriarte, Hebe Jorgelina; Lugo, Mónica Alejandra; Lumini, Erica Arbuscular mycorrhizal fungi (AMF) are a key soil functional group, with an important potential to increase crop productivity and sustainable agriculture including food security. However, there is clear evidence that land uses, crop rotations and soil features affect the AMF diversity and their community functioning in many agroecosystems. So far, the information related to AMF biodiversity in ecosystems like the Argentinean Puna, an arid high plateau where plants experience high abiotic stresses, is still scarce. In this work, we investigated morphological and molecular AMF diversity in soils of native corn, bean and native potato Andean crops, under a familiar land use, in Chaupi Rodeo (Jujuy, Argentina), without agrochemical supplements but with different histories of crop rotation. Our results showed that AMF morphological diversity was not only high and variable among the three different crop soils but also complemented by Illumina MiSeq data. The multivariate analyses highlighted that total fungal diversity is significantly affected by the preceding crop plants and the rotation histories, more than from the present crop species, while AMF communities are significantly affected by preceding crop only in combination with the effect of nitrogen and calcium soil concentration. This knowledge will give useful information on appropriate familiar farming.

Early Cretaceous neobatrachian frog (Anura) from Brazil sheds light on the origin of modern anurans Agnolin, Federico; de Souza Carvalho, Ismar; Aranciaga Rolando, Alexis Mauro; Novas, Fernando Emilio; Xavier Neto, José; Andrade, José Artur Ferreira Gomes de; Idalécio Freitas, Francisco The fossil record of anurans in South America is scarse, especially for Mesozoic-aged beds. The aim of the present paper is to describe a new neobatrachian anuran coming from the Early Cretaceous (Aptian) Crato Formation from Brazil. The specimen, represented by a nearly complete skeleton is reminiscent to the extant clade Hyloidea. In contrast with recent claims, this finding, together with previously known fossils from South America indicates that modern frog clades were present and well-diversified by 40 million years before the K/T boundary. In the same sense, the analysis of Mesozoic and Paleogene anuran record in South America contradicts the hypothesis of massive anuran extinction at the K/T boundary.

Effect of packaging material on the quality of fresh-cut beet leaves packed in modified atmospheres Fernandez, María Verónica; Agüero, Maria Victoria; Jagus, Rosa Juana This study aims to evaluate the effect of packaging system, including packaging materials with low, medium, and high oxygen permeance (OP), with or without initial atmosphere modification (IAM: 5kPaO2–10kPaCO2–85kPaN2) on minimally processed beet leaves (MPBL) overall quality during 8 days of storage at 12°C. Changes in microbial quality, pH, moisture content, and antioxidant capacity were independent of the packaging system. Samples with or without IAM achieved dynamic equilibrium in 24 or 144 hr, respectively. High, medium, and low OP material stabilized at 8kPaO2–3.5kPaCO2, 6kPaO2–6kPaCO2, and 0kPaO2–20kPaCO2, respectively. Low-OP presented anoxia conditions. High-OP material maintained total soluble solids and carotenoids and presented the highest retentions of betalains, chlorophyll, and total phenolics during storage. Moreover, active modified atmosphere packaging (with IAM) yielded significant improvements on bioactive retention. Hence, high-OP material with IAM is recommended for MPBL preservation. Practical applications: This research addresses one of the major challenges facing the growing industry of minimally processed fruit and vegetables, the rapid deterioration of their quality, and their reduced shelf-life. The results obtained are significant since give a practical and effective response to this challenge.

Applications of artificial intelligence in early detection of cancer, clinical diagnosis and personalized medicine Ullah M.; Akbar A.; Yannarelli, Gustavo Gabriel Artificial intelligence (AI) refers to the simulation of human intelligence in machines programmed to convert raw input data into decision-making actions, like humans. AI programs are designed to make decisions, often using deep learning and computer-guided programs that analyze and process raw data into clinical decision making for effective treatment. New techniques for predicting cancer at an early stage are needed as conventional methods have poor accuracy and are not applicable to personalized medicine. AI has the potential to use smart, intelligent computer systems for image interpretation and early diagnosis of cancer. AI has been changing almost all the areas of the medical field by integrating with new emerging technologies. AI has revolutionized the entire health care system through innovative digital diagnostics with greater precision and accuracy. AI is capable of detecting cancer at an early stage with accurate diagnosis and improved survival outcomes. AI is an innovative technology of the future that can be used for early prediction, diagnosis and treatment of cancer.

Phase Equilibria of Ternary Liquid–Liquid Systems (Water + C1–C4 Monocarboxylic Acids + Dibutyl Ether) at Three Different Temperatures: Modeling with A-UNIFAC  Yalin, I.; Çehreli, Süheyla; Andreatta, Alfonsina Ester; Senol, A. Liquid–liquid equilibrium (LLE) data for the ternary systems composed of water, C1–C4 monocarboxylic acids, and dibutyl ether were determined at three different temperatures (293.15, 303.15, and 313.15 K) and atmospheric pressure. The experimental solubility curves and mutual solubilities of (water + dibutyl ether) were determined by the cloud-point method, whereas the tie-lines of conjugate phases were obtained via GC analysis. The examined C1–C4 monocarboxylic acids are valuable components for estimating the effect of acid structure on LLE. The separation factor calculated from experimental LLE data is indicative of the ability of the solvent to effectively recover the acid. Equilibrium distribution of C1–C4 acids is better for more structured propionic and butyric acids as compared to less structured formic and acetic acids, and the general ranking with respect to the separation factor (S) follows the order: C4 > C3 > C2 > C1, and T293.15 < T303.15 ≤ T313.15. The LLE data were predicted with the group-contribution method A-UNIFAC with the newly estimated parameters, which shows an appropriate consistency with the experimental data.

Entre la masa del pánico y la articulación populista: conjeturas en torno al lazo social en la época del (pseudo) discurso capitalista; Between the Panic Mass and the Populist Articulation: Conjectures around the Social Bond in the era of the Capitalist (Pseudo) Discourse; Entre la masse de panique et l’articulation populiste: conjectures autour du lien social à l’époque du (pseudo) discours capitaliste Foa Torres, Jorge Gabriel; Reynares, Juan Manuel En este artículo pretendemos reflexionar sobre fenómenos políticos actuales de rasgos autoritarios a partir tanto de algunos desarrollos teóricos que articulan psicoanálisis y lenguajes de la teoría política contemporánea, como de la noción “masa del pánico”. Nuestra conjetura principal es que el actual debilitamiento generalizado de los significantes amo o nombres del padre, que entenderemos aquí a partir del trastocamiento enunciado por Lacan con el matema del discurso del capitalista, nos ubica ante un nuevo escenario donde el sujeto dividido no tiende a inscribirse en el lazo social, sino que, expuesto sin reservas al imperativo superyoico a gozar, se conecta, constituyendo masas del pánico; This paper will delve into current authoritarian political phenomena based on theoretical approaches that articulate psychoanalysis and contemporary political theory languages, and on the idea of “panic mass”. Our main assumption is that the current general weakening of signifiers related to master -or Names-of-the-Father-, approached from the disruption outlined by Lacan through the mathema of Capitalist Discourse, places us on a new scenario where the split subject does not tend to inscribe himself into social bonds, but, exposed without caution to the superego imperative to enjoy, connects and forms panic masses.; Dans cet article nous nous proposons de réfléchir sur des phénomènes politiques actuels, aux traits autoritaires, en nous appuyant, d’un côté, sur quelques développements théoriques articulant la psychanalyse et les langages de la théorie politique contemporaine et, de l’autre côté, sur la notion de « masse de panique ». Notre principale conjecture est que l’affaiblissement généralisé des signifiants maître et les noms du père, entendus ici à partir de la transposition énoncée par Lacan avec le mathème du discours du capitaliste, nous situe face à un nouveau scénario où le sujet divisé ne tend pas à s’inscrire dans le lien social, mais, exposé sans réserve à l’impératif surmoïque de jouir, il se connecte en constituant les masses de panique.

Boxeo, espectáculo y deporte. Hacia la construcción de una institucionalidad pugilística en la Buenos Aires de los años veinte; Boxing, show and sport. Towards the construction of a pugilistic institutional framework in the Buenos Aires of the twenties Fernandez de Ullivarri, Maria El objetivo de este trabajo es analizar las tensiones en la consolidación del boxeo como un deporte-espectáculo en la ciudad de Buenos Aires durante los años veinte. En ese camino nos interesa empezar a desandar esa malla que fue dando forma y sentido a esa práctica: el crecimiento de los clubes de la ciudad, las oportunidades de trabajo que generó para un conjunto amplio de hombres, la institucionalización, la regulación y la construcción de un universo simbólico en torno al pugilismo que incluía formas e imaginarios sociales, así como también la disputa por el gusto de los espectadores y las formas técnica y boxísticamente adecuadas de llevar adelante un combate. Pensar cómo se construyó una práctica física nos puede permitir adentrarnos en las lógicas más internas de un deporte estigmatizado por un lado y valorado por otro, que fue conformando sentidos y masculinidades en el temprano siglo XX.; the main purpose of this paper is to analyze the tensions in the consolidation of boxing as a sport-show in the city of Buenos Aires during the twenties. In this way we are interested in starting to retrace that mesh that was giving form and meaning to the practice of that sport: the development of new clubs in the city, the job opportunities that were generated for a wide group of men, the institutionalization, the regulation and the construction of a symbolic universe around pugilism that included social forms and imaginaries, as well as the dispute for the taste of the spectators and the appropriate ways (in terms of technic and style) to carry out a fight.

Niche partitioning between coexisting gentoo Pygoscelis papua and Magellanic penguins Spheniscus magellanicus at Martillo Island, Argentina Harris, Sabrina; Scioscia, Gabriela; Klemens, Pütz; Thomas, Mattern; Raya Rey, Andrea Nélida Marine top predators living in sympatry tend to use their environment differentially, thereby reducing niche overlap. Magellanic penguins (Spheniscus magellanicus) and gentoo penguins (Pygoscelis papua) coexist at Martillo Is., Argentina. During the 2014, 2015 and 2017 breeding seasons a total of thirty-one Magellanic and eleven gentoo penguins were equipped with GPS-TDR loggers to record foraging trips. Both species dove to similar maximum depths with analogous effort (dives per hour). Magellanics, however, undertook longer trips and travelled further away from the colony (25 h and 43 km vs. 10 h and 20 km on average, respectively). Gentoos on the other hand, performed longer dives, had a higher percentage of “U” shaped dives and spent more time during the bottom phase of the dive. Gentoos foraged exclusively within an area close to the colony and in waters not deeper than 80 m. Magellanics had more variability in their behaviors and were not associated to a specific depth or distance from the colony. The ecological circumstances of both species (targeted prey and surrounding environment) suffice to explain the particular behaviors of both species independently from the presence of the other. Gentoos seem to focus on benthic prey which remains stable in this environment throughout the year, and Magellanics behave more opportunistically searching for pelagic prey during early chick rearing. Competition may not be always shaping coexistence of species of similar trophic positions and behaviors. Particularly, if resources are not limited, both species can behave in ways they find optimal without factoring the coexistence of the other species.

Digging the topology of rock art in northwestern Patagonia Vargas, Fernando Emmanuel; Lanata, Jose Luis; Abramson, Guillermo; Kuperman, Marcelo Nestor; Fiore, Danae We present a study on the rock art of northern Patagonia based on network analysis and communities detection. We unveil a significant aggregation of archaeological sites, linked by common rock art motifs that turn out to be consistent with their geographical distribution and archaeological background of hunter-gatherer stages of regional peopling and land use. This exploratory study will allow us to approach more accurately some social strategies of visual communication entailed by rock art motif distribution, in space and time.

Multiwavelenght study in the region of IRAS sources 16571-4029 and 16575-4023 Baume, Gustavo Luis; Corti, Mariela Alejandra; Borissova, Jura; Ramirez Alegria, S.; Corvera, Andrea V. We studied the stellar populations and their associated interstellar medium structures located in the region of IRAS 16571-4029 and 16575-4023 sources, aiming to evaluate their distance and their main physical parameters. We focused our attention on the embedded cluster DBS 113 and its associated HII region RCW 116B.For the study, optical images were obtained using wide band and narrow band filters (ugri andOIII, OIIIC, H, HC, SII respectively) together with infrared (K band) spectra for several starsin the region of DBS 113. These data were complemented with available information from the literature and photometric multi-band data from several surveys at optical (VPHAS+), infrared (2MASS, VVV, WISE) and radio (SGPS, PMN) spectral ranges. Astrometic and photometric data from GAIA DR2 in the region were also taken into account.All the obtained spectra in DBS 113 region correspond to early type stars (OB). In general, weidentified in this region 2 O-type, í 20 B-type stars, í 25 probable pre-main sequence ones, and 10 candidates to young stellar objects. We also built their stellar energy distributions ranging from 0.3 to 22 m. We found an abnormal behaviour of the reddening law (RV = 4:0) and a corresponding spectrophotometric distance from optical/infrared data consistent with the distance computed from GAIA measurements (d í 2 kpc). This value locates this cluster at the inner side of the Sagittarius-Carina Galactic arm and is different from the traditionally adopted kinematic distance of 1-1.2 kpc, based on hydrogen recombination line at millimeter wavelengths. This difference was explained by the presence of an hydrogen expanding bubble with a central velocity relative the molecular cloud.The new proposed distance value allowed to estimate more precisely the parameter values of the HII region RCW116B and to describe the energetic balance among the emission of most massive stars, the ionization of the region and the heated dust. Regarding the IRAS 16575-4023 source, we found that the brightest star in this region is a foreground object andwe also identified a set of OB stars candidates with high absorption values (AV í 23), located behind the molecular cloud AGAL345.336+01.021.

Stable isotopes in hair reveal dietary protein sources with links to socioeconomic status and health Ehleringer, James R.; Covarrubias Avalos, Stephannie; Tipple, Brett J.; Valenzuela, Luciano Oscar; Cerling, Thure E. Carbon and nitrogen isotope ratios in hair sampled from 65 communities across the central and intermountain regions of the United States and more intensively throughout 29 ZIP codes in the Salt Lake Valley, Utah, revealed a dietary divergence related to socioeconomic status as measured by cost of living, household income, and adjusted gross income. Corn-fed, animal-derived proteins were more common in the diets of lower socioeconomic status populations than were plant-derived proteins, with individual estimates of animal-derived protein diets as high as 75%; United States towns and cities averaged 57%. Similar patterns were seen across the socioeconomic status spectrum in the Salt Lake Valley. It is likely that corn-fed animal proteins were associated with concentrated animal-feeding operations, a common practice for industrial animal production in the United States today. Given recent studies highlighting the negative impacts of animal-derived proteins in our diets, hair carbon isotope ratios could provide an approach for scaling assessments of animal-sourced foods and health risks in communities across the United States.

Patrimonio sonoro y digitalización: Memorias radiofónicas e imaginarios sociales regionales sobre LU10 Radio Azul Boggi, Silvia Marta; Silva, Ana Cecilia; Arabito, Jorge Este artículo expone los principales resultados obtenidos a partir del desarrollo de diversas acciones y estrategias destinadas a la recuperación, puesta en valor y disponibilidad pública del patrimonio sonoro y gráfico de LU10 Radio Azul, emisora de AM ubicada en la ciudad bonaerense homónima que inició su transmisión en la década de 1950 y continúa en el aire. Desde el año 2016 un equipo integrado por docentes investigadorxs y estudiantes de la Facultad de Ciencias Sociales de la Universidad Nacional del Centro de la Provincia de Buenos Aires, en articulación con trabajadores de la radio, nos hemos ocupado del acondicionamiento, catalogación, digitalización y difusión de los archivos sonoros de esa radiodifusora, labor que en la última etapa se amplió a la documentación gráfica almacenada en su edificio. El trabajo sobre el material de archivo, así como la utilización del mismo en nuevas producciones radiofónicas, permitió abrir líneas de indagación acerca de los modos en que la presencia de la radio se ha entramado con la dinámica sociocultural de la localidad y la región.