A task execution scheme for dew computing with state-of-the-art smartphones Hirsch Jofré, Matías Eberardo; Mateos Diaz, Cristian Maximiliano; Zunino Suarez, Alejandro Octavio; Majchrzak, Tim A.; Grønli, Tor-Morten; Kaindl, Hermann The computing resources of today’s smartphones are underutilized most of the time. Using these resources could be highly beneficial in edge computing and fog computing contexts, for example, to support urban services for citizens. However, new challenges, especially regarding job scheduling, arise. Smartphones may form ad hoc networks, but individual devices highly differ in computational capabilities and (tolerable) energy usage. We take into account these particularities to validate a task execution scheme that relies on the computing power that clusters of mobile devices could provide. In this paper, we expand the study of several practical heuristics for job scheduling including execution scenarios with state-of-the-art smartphones. With the results of new simulated scenarios, we confirm previous findings and better comprehend the baseline approaches already proposed for the problem. This study also sheds some light on the capabilities of small-sized clusters comprising mid-range and low-end smartphones when the objective is to achieve real-time stream processing using Tensorflow object recognition models as edge jobs. Ultimately, we strive for industry applications to improve task scheduling for dew computing contexts. Heuristics such as ours plus supporting dew middleware could improve citizen participation by allowing a much wider use of dew computing resources, especially in urban contexts in order to help build smart cities.

Arackar licanantay gen. et sp. nov. a new lithostrotian (Dinosauria, Sauropoda) from the Upper Cretaceous of the Atacama Region, northern Chile Rubilar Rogers, David; Vargas, Alexander O.; Gonzalez Riga, Bernardo Javier; Soto Acuña, Sergio; Alarcón Muñoz, Jhonatan; Iriarte Díaz, José; Arévalo, Carlos; Gutstein, Carolina Simon A new lithostrotian sauropod, Arackar licanantay gen. et sp. nov. is described based on a partial skeleton from the Upper Cretaceous (Campanian–Maastrichtian) beds of the Hornitos Formation, Atacama Region, northern Chile. The holotype consists of axial (cervical and dorsal vertebrae) and appendicular (humerus, femur and ischium) elements of a sub-adult specimen (ca. 6.3 m long). Autapomorphies characterizing this new titanosaur include: middle neural arches with wide and tall centroprezygapophyseal fossa + parapophyseal centroprezygapophyseal fossa (cprf + pacprf) extending on the entire anterior faces of the pedicles, but not above the neural canal, and reduced spinopostzygapophyseal laminae, shorter than the postzygapophyseal facet length. A phylogenetic analysis based on a data matrix of 87 taxa and 405 characters recovered Arackar as a derived lithostrotian titanosaur, placing it in a clade that includes Rapetosaurus + (Arackar + Isisaurus). This is the third dinosaur named from Chile and the third titanosaur from the western side of the Andes in South America.

Improving ciprofloxacin antimicrobial activity through lipid nanoencapsulation or non-thermal plasma on Pseudomonas aeruginosa biofilms Muraca, Giuliana Sabrina; Soler Arango, Juliana; Castro, Guillermo Raul; Islan, German Abel; Brelles Mariño, Graciela Antibiotic resistance is a significant challenge in the clinical practice. Pseudomonas aeruginosa is a multidrug-resistant opportunistic pathogen prevalent in hospital settings. Besides, P. aeruginosa forms biofilms that aggravate the problem since biofilms are more resilient to conventional decontamination methods than their planktonic counterparts. Due to the lack of novel antibiotics, the emergence of multidrug-resistant strains, and the resilience of biofilms to antimicrobials, new approaches based on the combination of agents are desirable. Non-thermal plasma (NTP) and nanotechnology-based strategies are an alternative to conventional decontamination/sterilization methods. NTP causes microbial cell damage or death, and it has been proved effective to inactivate more than 99% of biofilm cells after a short exposure to plasma. Nanotechnology is a promising strategy to overcome antibiotic resistance/tolerance of microbial biofilms and nanotechnology-based drug delivery systems may interact with the biofilm matrix and help remove bacterial biofilms. Nanoparticles known as “nanostructured lipid carriers” (NLCs) have been proposed as efficient and tailorable drug delivery systems since their physicochemical properties facilitate their penetrability. The aim of this study was to assess the effectiveness of ciprofloxacin-loaded NLC formulations and their potential synergy with plasma on P. aeruginosa biofilms. A decrease in the minimum inhibitory concentration was reported for biofilms exposed to plasma and free ciprofloxacin, and for biofilms treated with NLCs. The synergy between NLCs and NTP was not found under the experimental conditions used, and further research is needed to test other conditions that might result in synergy. Results show the potential of nanoparticles and plasma for biofilm inactivation.

8 fs laser pulses from a compact gas-filled multi-pass cell Rueda Suescun, Pedro Enrique; Videla, Fabian Alfredo; Witting, T.; Torchia, Gustavo Adrian; Furch, J. Compression of 42 fs, 0.29 mJ pulses from a Ti:Sapphire amplifier down to 8 fs (approximately 3 optical cycles) is demonstrated by means of spectral broadening in a compact multi-pass cell filled with argon. The efficiency of the nonlinear pulse compression is limited to 45 % mostly by losses in the mirrors of the cell. The experimental results are supported by 3-dimensional numerical simulations of the nonlinear pulse propagation in the cell that allow us to study spatio-spectral properties of the pulses after spectral broadening.

Direct measurement and modeling of intraglottal, subglottal, and vocal fold collision pressures during phonation in an individual with a hemilaryngectomy Mehta, Daryush D.; Kobler, James B.; Zeitels, Steven M.; Zañartu, Matías; Ibarra, Emiro J.; Alzamendi, Gabriel Alejandro; Manriquez, Rodrigo; Erath, Byron D.; Peterson, Sean D.; Petrillo, Robert H.; Hillman, Robert E. The purpose of this paper is to report on the first in vivo application of a recently developed transoral, dual-sensor pressure probe that directly measures intraglottal, subglottal, and vocal fold collision pressures during phonation. Synchronous measurement of intraglottal and subglottal pressures was accomplished using two miniature pressure sensors mounted on the end of the probe and inserted transorally in a 78-year-old male who had previously undergone surgical removal of his right vocal fold for treatment of laryngeal cancer. The endoscopist used one hand to position the custom probe against the surgically medialized scar band that replaced the right vocal fold and used the other hand to position a transoral endoscope to record laryngeal high-speed videoendoscopy of the vibrating left vocal fold contacting the pressure probe. Visualization of the larynx during sustained phonation allowed the endoscopist to place the dual-sensor pressure probe such that the proximal sensor was positioned intraglottally and the distal sensor subglottally. The proximal pressure sensor was verified to be in the strike zone of vocal fold collision during phonation when the intraglottal pressure signal exhibited three characteristics: an impulsive peak at the start of the closed phase, a rounded peak during the open phase, and a minimum value around zero immediately preceding the impulsive peak of the subsequent phonatory cycle. Numerical voice production modeling was applied to validate model-based predictions of vocal fold collision pressure using kinematic vocal fold measures. The results successfully demonstrated feasibility of in vivo measurement of vocal fold collision pressure in an individual with a hemilaryngectomy, motivating ongoing data collection that is designed to aid in the development of vocal dose measures that incorporate vocal fold impact collision and stresses.

Hacia la configuración del sujeto cultural converso en un manuscrito de João Pinto Delgado Gonzalez Molina, Mario Augusto Este trabajo analiza la categoría del sujeto converso como sujeto cultural, noción proveniente de la sociocrítica. En cuanto a su configuración discursiva se considera que el manuscrito Dialogos contra a Cristandade de João Pinto Delgado se ubica en el espectro de la literatura de conversos, teniendo en cuenta su delimitación genérica y las posibilidades teóricas para abordar otros textos similares del Siglo de Oro. El objetivo es abrir la discusión de la presencia de voces silenciadas ante un discurso hegemónico como una forma de legitimación desde la literatura.

Heuristic Methodology for Planning AC Rural Medium-Voltage Distribution Grids Montoya Giraldo, Oscar Danilo; Serra, Federico Martin; de Angelo, Cristian Hernan; Chamorro, Harold R.; Alvarado Barrios, Lázaro The optimal expansion of AC medium-voltage distribution grids for rural applications is addressed in this study from a heuristic perspective. The optimal routes of a distribution feeder are selected by applying the concept of a minimum spanning tree by limiting the number of branches that are connected to a substation (mixed-integer linear programming formulation). In order to choose the caliber of the conductors for the selected feeder routes, the maximum expected current that is absorbed by the loads is calculated, thereby defining the minimum thermal bound of the conductor caliber. With the topology and the initial selection of the conductors, a tabu search algorithm (TSA) is implemented to refine the solution with the help of a three-phase power flow simulation in MATLAB for three different load conditions, i.e., maximum, medium, and minimum consumption with values of 100%, 60%, and 30%, respectively. This helps in calculating the annual costs of the energy losses that will be summed with the investment cost in conductors for determining the final costs of the planning project. Numerical simulations in two test feeders comprising 9 and 25 nodes with one substation show the effectiveness of the proposed methodology regarding the final grid planning cost; in addition, the heuristic selection of the calibers using the minimum expected current absorbed by the loads provides at least 70% of the calibers that are contained in the final solution of the problem. This demonstrates the importance of using adequate starting points to potentiate metaheuristic optimizers such as the TSA.

A Monolithic Solid-State Sodium–Sulfur Battery with Al-Doped Na 3.4 Zr 2 (Si 0.8 P 0.2 O 4 ) 3 Electrolyte Lu, Liang; Lu, Yao; Alonso, José Antonio; Lopez, Carlos Alberto; Fernández Díaz, Maria Teresa; Zou, Bingsuo; Sun, Chunwen The limit of the energy density and increasing security issues on sodium-ion batteries (SIBs) impede their further development. Solid-state sodium metal batteries are potential candidates to replace the present SIBs. However, low ionic conductivity and poor interface contact hinder their progress. In this work, the impact of Al doping on the crystalline structure and ionic transport in Na3.4Zr2(Si0.8P0.2O4)3 was studied by neutron powder diffraction. The ionic conductivity of Na3.5Zr1.9Al0.1Si2.4P0.6O12 achieves 4.43 × 10-3 S cm-1 at 50 °C. The polarization voltage of the Na||Na symmetric battery is about 40 mV after cycling for more than 1600 h. Moreover, a solid-state sodium-sulfur battery with a monolithic structure was constructed to alleviate the interfacial resistance problems. Its specific discharge capacity can still keep 300 mA h g-1 after 480 cycles at 300 mA g-1. The work provides a promising strategy to design solid-state sodium-sulfur batteries with high performances.

Landscape Engineering Impacts the Long-Term Stability of Agricultural Populations Freeman, Jacob; Anderies, John M.; Beckman, Noelle G.; Robinson, Erick; Baggio, Jacopo A.; Bird, Darcy; Nicholson, Christopher; Finley, Judson Byrd; Capriles, José M.; Gil, Adolfo Fabian; Byers, David; Gayo, Eugenia; Latorre, Claudio Explaining the stability of human populations provides knowledge for understanding the resilience of human societies to environmental change. Here, we use archaeological radiocarbon records to evaluate a hypothesis drawn from resilience thinking that may explain the stability of human populations: Faced with long-term increases in population density, greater variability in the production of food leads to less stable populations, while lower variability leads to more stable populations. However, increased population stability may come with the cost of larger collapses in response to rare, large-scale environmental perturbations. Our results partially support this hypothesis. Agricultural societies that relied on extensive landscape engineering to intensify production and tightly control variability in the production of food experienced the most stability. Contrary to the hypothesis, these societies also experienced the least severe population declines. We propose that the interrelationship between landscape engineering and increased political-economic complexity reduces the magnitude of population collapses in a region.

Molecular mechanisms underlying responses of the Antarctic coral Malacobelemnon daytoni to ocean acidification Servetto, Natalia; de Aranzamendi, Maria Carla; Bettencourt, R.; Held, Christoph; Abele, D.; Movilla, J.; Gonzalez, Germán Alexis; Bustos, Diego Martin; Sahade, Ricardo Jose Benthic organisms of the Southern Ocean are particularly vulnerable to ocean acidification (OA), as they inhabit cold waters where calcite-aragonite saturation states are naturally low. OA most strongly affects animals with calcium carbonate skeletons or shells, such as corals and mollusks. We exposed the abundant cold-water coral Malacobelemnon daytoni from an Antarctic fjord to low pH seawater (LpH) (7.68 ± 0.17) to test its physiological responses to OA, at the level of gene expression (RT-PCR) and enzyme activity. Corals were exposed in short- (3 days) and long-term (54 days) experiments to two pCO2 conditions (ambient and elevated pCO2 equaling RCP 8.5, IPCC 2019, approximately 372.53 and 956.78 μatm, respectively). Of the eleven genes studied through RT-PCR, six were significantly upregulated compared with control in the short-term in the LpH condition, including the antioxidant enzyme superoxide dismutase (SOD), Heat Shock Protein 70 (HSP70), Toll-like receptor (TLR), galaxin and ferritin. After long-term exposure to low pH conditions, RT-PCR analysis showed seven genes were upregulated. These include the mannose-binding C-Lectin and HSP90. Also, the expression of TLR and galaxin, among others, continued to be upregulated after long-term exposure to LpH. Expression of carbonic anhydrase (CA), a key enzyme involved in calcification, was also significantly upregulated after long-term exposure. Our results indicated that, after two months, M. daytoni is not acclimatized to this experimental LpH condition. Gene expression profiles revealed molecular impacts that were not evident at the enzyme activity level. Consequently, understanding the molecular mechanisms behind the physiological processes in the response of a coral to LpH is critical to understanding the ability of polar species to cope with future environmental changes. Approaches integrating molecular tools into Antarctic ecological and/or conservation research make an essential contribution given the current ongoing OA processes.

Potential distribution models from two highly endemic species of subterranean rodents of Argentina: which environmental variables have better performance in highly specialized species? Austrich, Ailin; Kittlein, Marcelo Javier; Mora, Matias Sebastian; Mapelli, Fernando Javier South American rodents of the genus Ctenomys (tuco-tucos) occupy the underground environment, present high specificity to loose and friable soils and have restricted mobility, with a generally fragmented distribution. We use species distribution models (SDMs) in two Ctenomys species from the Atlantic coast and continental areas of Argentina. We develop SDMs using Maxent software for Ctenomys australis and Ctenomys talarum, which coexist in a narrow coastal landscape with restricted distributions. We model the potential distributions of both species using, first, bioclimatic variables (Group 1), and second, Landsat 8 bands and granulometric layers (Group 2). According to the known distributions of the species, the Group 2 variables showed the greatest accuracy for inferring their potential distributions. The most important variables for predicting habitat suitability were, primarily, the majority of granulometric variables and some Landsat 8 bands such as the bands 4 and 5, related to the vegetation cover. We also analyze the level of overlapping niches between these two species, and we found that there is a certain degree of geographical overlap between them, and also present ecologically similar niches, despite the fact that the characteristics of their habitats differ in certain aspects. We conclude that in tuco-tucos species, their potential distributions are better predicted by variables that consider the particular characteristics of soils and cover vegetation, since they are specialized species of substrates. Also, a higher spatial resolution allows a better performance of the Ctenomys species models, which was expected for species with restricted distributions.

On the relation between the astrophysical neutrino fluxes and the cosmic ray fluxes Roulet, Esteban Some generalizations of the relation between high-energy astrophysical neutrino and cosmic ray fluxes are obtained, taking into account present results on the cosmic ray spectrum and composition as well as a more realistic modeling of the Galactic and extragalactic cosmic ray components down to PeV energies. It is found that the level of neutrino fluxes measured by IceCube can be consistent with sources that are thin to escaping protons. This could also make it easier for heavier nuclei to be emitted from the sources without suffering excessive disintegration processes.

Roberto Santoro: retrato del poeta como saltimbanqui Catalano, María Agustina Este artículo analiza la imagen de escritor en Roberto Santoro (1939-1977) desde un diálogo doble: con la figura del saltimbanqui, desarrollada por Jean Starobinski en su ensayo Retrato del artista como saltimbanqui, y con el modelo del escritor-intelectual comprometido, vigente durante los años 60 y 70. Para ello, consideraremos los poemarios, publicaciones en revistas y algunas intervenciones públicas o de índole artística y cultural de Santoro.

Varieties of K-lattices Aglianò, Paolo; Marcos, Miguel In this paper we deal with varieties of commutative residuated lattices that arise from a specific kind of construction: the twist-product of a lattice. Twist-products were first considered by Kalman in 1958 to deal with order involutions on plain lattices, but the extension of this concept to residuated lattices has attracted some attention lately. Here we deal mainly with varieties of such lattices that can be obtained by applying a specific twist-product construction to varieties of integral and commutative residuated lattices.

Lamb and wool provisioning ecosystem services in Southern Patagonia Peri, Pablo Luis; Rosas, Yamina Micaela; Rivera, Emilio; Martínez Pastur, Guillermo José In Southern Patagonia, grasslands are the principal food resource for sheep reared for meat and wool as the main provisioning ecosystem services (ES). The main objective of this study was to model lamb and wool production as provisioning ES at a regional scale using climatic, topo-graphic, and vegetation variables from sheep farms across Santa Cruz province. At a regional level, animal yield ranged from 0.25 to 0.69 g lamb/m2/yr and 0.10 to 0.19 g greasy wool/m2/yr. We used multiple regression models to produce maps of lamb and wool provisioning ES across Santa Cruz province. The model for variation of lamb production explained 96% of the variance in the data and the most significant predictor variables were temperature seasonality, normalized vegetation index (NVDI, dimensionless), and desertification index. The most important variables for the model of greasy wool production were isothermality, temperature seasonality, and NVDI, which together explained 98% of the variance. The lowest CF values of both products (lamb and wool) were located in more productive grasslands. There were differences in lamb and wool production across vegetation types with the highest values being located in more productive grasslands (0.51 g lamb/m2/yr in Nothofagus antarctica forest and 0.15 g greasy wool/m2/yr in Magellanic grass steppe and N. ant-arctica). Lamb and greasy wool yields decreased with desertification gradient due to erosion pro-cesses. The main limitation of the model is related to the data availability at landscape level, which must be improved in future studies by accounting for soil type, fertility, and soil water content. The results of lamb and wool production found in the present work assist in characterizing the provisioning ES ecosystem of livestock products in Southern Patagonia. The successful management of livestock becomes an important challenge to the commercial and policy communities to satisfy so-ciety’s need for food and wool products under sustainable grassland management.

The roman peasantry in Virgil’s Aeneid; El campesino romano en la Eneida de Virgilio Ames, Maria Cecilia El recuerdo de las guerras que tuvieron lugar en el Lacio y sus consecuencias concretas para la elite campesina italiana en particular y los campesinos y labradores romanos en general, son elementos que el lector romano contemporáneo de Virgilio debe haber reconocido en la obra inmediatamente en forma de alusiones y referencias, mientras para nosotros parecen veladas y exigen un ejercicio de búsqueda e interpretación. Como ciudadano de una Roma en la cima de su esplendor, bajo el impero de Augusto, y como poeta proveniente de una comarca italiana, Virgilio es un autor sensible a las heridas que provocaron las distintas guerras en el cuerpo social y ha vertido en la obra épica su recuerdo y su versión de la historia como un acto de memoria y homenaje, no sólo a los héroes que pelearon por Roma, sino a la totalidad de soldados y campesinos anónimos, que a su regreso encontraron desoladas las tierras de cultivo. El objetivo de este trabajo es centrarnos en las menciones del despoblamiento de los campos en Eneida y analizarlas como acto de memoria, es decir como formador de un horizonte de lectura para los contemporáneos de Virgilio, que sin duda hacen presente el pasado de las guerras a través de una de sus consecuencias más influyentes, la transformación del campo italiano y de la elite campesina.; The recollection of the wars that took place in Latium and their concrete consequences for the Italian peasant elite in particular and the Roman peasants and laborers in general, are elements the contemporary reader of Virgil must have recognized immediately in the form of allusions and references, while for us they appear veiled and demand an exercise of search and interpretation. As a citizen of Rome at the peak of its splendor, under Augustus’s rule, and as a poet from an Italian county, Virgil is an author that is sensitive to the wounds inflicted on the social body by different wars and he has poured his recollections and his version of history into his work as an act of memory and homage, not only for the heroes who fought for Rome but also for all the soldiers and anonymous peasants who returned to find their farmlands devastated. This work aims to focus on the references to the depopulation of fields in the Aeneid and to analyze them as an act of memory, that is to say, as something that creates a reading horizon for Virgil’s contemporaries who undoubtedly bring past wars to the present through one of their most influential consequences, the transformation of the Italian countryside and the peasant elite.

Performance of surface winds from atmospheric reanalyses in the Southwestern South Atlantic Ocean Pescio, Andrés Esteban; Dragani, Walter Cesar; Martin, Paula Beatriz Sea surface wind (10-m high) is one of the most important variables for oceanic applications. The zonal and meridional surface wind components from seven global atmospheric reanalyses [National Centers for Environmental Prediction (NCEP)/National Center for Atmospheric Research Reanalysis 1, NCEP/Department of Energy Reanalysis 2, NCEP/climate forecast system reanalysis (CFSR), European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Reanalysis (ERA-Interim), Japanese 55-year Reanalysis (JRA-55), the Modern-Era Retrospective Analysis for Research and Application V2, and the ERA5 Reanalysis] were compared with surface winds retrieved from QuikScat/SeaWinds and Ascat scatterometers, and with surface ground winds measured in eight coastal meteorological stations, at the Southwestern South Atlantic Ocean, between 35° and 55°S and 55° and 70°W, approximately. Bias, root mean squared error and the Pearson linear correlation coefficient for the zonal and meridional wind components were estimated in this study. The effects of the atmospheric stability, the surface currents and the discontinuity between land and sea roughness on the satellite data are discussed in this paper. It was concluded that Modern-Era Retrospective Analysis for Research and Application, Version 2 reanalysis is the product that better fitted with satellite data, and ERA5 follows it in performance. CFSR, ERA-Interim and JRA-55 reanalyses also presented very good performances. Surface winds from NR1 and NR2 reanalysis showed the largest differences with satellite data. ERA5 reanalysis was the database that better compared with the coastal observations measured at the meteorological stations. Surface winds measured at meteorological stations are, in general, worse represented by the reanalyses than satellite data. This last could be due to the discontinuity between land and sea roughness, and because the topography is not completely represented by the atmospheric global models.

Identification and characterization of basic copper sulfates as mineral green pigments in Andean colonial mural paintings: Use of temperature-controlled stage for the study of thermal induced antlerite degradation Tomasini, Eugenia Paula; Costantini, Ilaria; Rúa Landa, Carlos; Guzmán, Fernando Diego; Pereira, Magdalena; Castro, Kepa; Siracusano, Gabriela Silvana; Madariaga, Juan Manuel; Maier, Marta Silvia This work describes the characterization of green pigments in wall paintings from the Andean churches of San José de Soracachi and Santiago de Callapa in Bolivia, located on an ancient colonial commercial route known as the Silver Route. To approach our goal, microsamples extracted from the mural paintings and mineral samples, from a mine of the same area, were studied by using micro-Raman spectroscopy complemented with micro-energy-dispersive X-ray fluorescence spectroscopy (μ-EDXRF) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) analysis. The use of gypsum as the preparation layer was detected, and it suggests a secco painting technique. Antlerite, a basic copper sulfate, was identified suggesting a preference for its use as green pigment in the mural paintings of Andean churches that may be related to the local availability of this mineral. Indeed, this study revealed the presence of heterogeneous particles of the basic copper sulfate together with aluminosilicates, quartz and iron oxides among others, which points to a mineral origin of the green pigment because the same compounds were found in the samples taken in the mine. Because a phase transition has been noticed during the Raman analyses, due to a high power of the laser radiation, some tests have been carried out, varying the laser power, and coupling the Raman spectrometer to a temperature-controlled stage to verify under which conditions the degradation of the mineral sample of antlerite occurs allowing in this way a correct characterization of basic copper sulfate pigments. These results contribute to the study of the Andean colonial artistic cultural heritage, and this information will be made available for the construction of a database of local pigments of mineral origin used in Andean colonial art.

Efecto del estrés térmico por altas temperaturas durante floración e inicio de llenado de granos en diferentes genotipos de arroz (Oryza Sativa l.) Gregori, Leonardo Agustín; Pirchi, Héctor Javier; Arguissain, Gustavo Gabriel; Iglesias, A. I.; Crepy, Maria Andrea; Caluva, E. C.; Pachecoy, María Inés El calentamiento global se ha convertido en uno de los problemas más complejos que afectan a la producción agrícola. El cambio climático global ha generado un incremento de la temperatura del aire de 0,5 °C en el siglo XX (Maraseni et al., 2009). Masuduzzaman et al (2016) mencionan que las emisiones globales de dióxido de carbono, causado por las actividades humanas, alcanzó un récord en 2011 y es probable un aumento significativo en los años siguientes, favoreciendo así al aumento de la temperatura del aire a nivel global. El informe de síntesis sobre cambio climático 2014, generado por el Grupo Intergubernamental de expertos sobre cambio climático (IPCC) indica que, durante este siglo, es muy factible que la temperatura de la superficie global aumente de 1,1 a 2,9 °C y de 2,4°C a 6,4°C para escenarios con emisiones de dióxido de carbono bajas y altas, respectivamente (IPCC, 2014). Khan et al. (2019) indican que el aumento de la temperatura reduciría la producción de arroz cerca de un 40% a finales del siglo XXI. Del mismo modo, Peng et al. (2004), sostienen grandes pérdidas de rendimiento de arroz en respuesta al incremento en la temperatura diurna y nocturna, las cuales aumentaran en frecuencia y severidad. El estrés por calor se puede definir como un conjunto de daños irreversibles en el metabolismo, que genera cambios en el crecimiento y desarrollo de las plantas, causado por las altas temperaturas. Estas temperaturas generan cambios anatómicos, morfológicos y funcionales en las plantas, algunos similares a los producidos por el estrés hídrico, tales como: reducción del tamaño de las células, reducida conductancia estomática y cierre de estomas, cambios en la permeabilidad de las membranas, incrementos de la densidad de estomas y tricomas, y vasos del xilema de mayor tamaño (ChavesBarrantes et al., 2017). En arroz, las altas temperaturas del aire en floración inducen a la deficiente dehiscencia de las anteras con escaso desprendimiento del polen, resultando en un aumento de la esterilidad (Matsui et al., 2002). Durante llenado de granos, las altas temperaturas alteran la removilización de fotoasimilados, acortan la duración de este período, reduciendo de este modo el rendimiento y calidad del grano (Kim et al., 2011). La resistencia al calor de una planta se puede clasificar en evitación, escape y tolerancia. En el mecanismo de escape, la planta intenta completar su período reproductivo antes del inicio del estrés. En el caso de evitación, la planta mantiene un alto estado hídrico al reducir el área foliar, cerrando las estomas. Así también, otros mecanismos de evitación son la emergencia de la panoja y de antesis por la mañana en condiciones menos estresantes, cobertura de la panoja que permita reducir la tasa de evaporación de las anteras, hojas superiores largas y erectas que protejan la panoja de condiciones de temperatura elevada. La capacidad de tolerancia de una planta al calor, es su capacidad de mostrar un normal crecimiento y mantener los niveles productivos en condiciones de alta temperatura. El mantenimiento de una alta tasa fotosintética ante un estrés térmico se correlaciona positivamente con la tolerancia al calor (Cao et al., 2003). Chaves-Barrantes et al. (2017) mencionan que existen otros mecanismos de tolerancia que incluyen alteraciones en la composición lipídica de las membranas, producción de antioxidantes, la acumulación de osmolitos compatibles y pigmentos. La presencia de estomas abiertos en condiciones de alta temperatura, permiten mantener una mayor conductancia estomática, indicando que las tasas de fotosíntesis y transpiración son potencialmente más altas. Existe escasa información disponible sobre características de evitación y mecanismos de tolerancia al estrés térmico en arroz. Se considera muy importante poder identificar fuentes de tolerancia a estas condiciones de altas temperaturas. El objetivo del trabajo corresponde a identificar caracteres asociados a una mayor tolerancia a estrés térmico por altas temperaturas durante floración e inicio de llenado de granos.

La ideología queer y sus dispositivos económico-políticos para sustituir el “sexo” por la “identidad de género”; Queer ideology and its economic-political devices to substitute "sex" for "gender identity" Binetti, María José El objetivo de este artículo consiste en visibilizar los supuestos constructivistas y relativistas de la ideología queer, y su aplicación en materia socio-política. La propuesta central de esta ideología consiste en eliminar la diferencia sexual y normalizar en su lugar identidades de género múltiples y diversas, correspondientes con el modo en que cada uno siente y percibe los estereotipos sexistas de su cultura. Como toda ideología, su finalidad es económica y reside en la des-regulación del mercado global de cuerpos, sexos e identidades. El lobby corporativo de la agenda queer-neoliberal financia políticas públicas tendientes a perpetuar la subordinación sexo-reproductiva de las mujeres mediante la estrategia de reducir la diferencia sexual a una auto-percepción de género y eliminar la especificidad de sus derechos, garantías, protecciones y espacios. El proyecto político del feminismo es así fragmentado en grupos de identidad minoritarios e interseccionados; y los derechos humanos, convertidos en los deseos privados de algunos.; This article aims at showing the constructivist and relativist assumptions of queer ideology, and its application in the socio-political field. The main proposal of this ideology consists of eliminating the sexual difference and normalizing instead the multiple and diverse gender identities, corresponding with the way in which each one feels and perceives the sexist stereotypes of their culture. Like all ideology, its purpose is economic and resides in the deregulation of the global market of bodies, sexes and identities. The corporate lobby of the queer-neoliberal agenda funds public policies aimed at perpetuating the sexualreproductive subordination of women through the strategy of reducing sexual difference to a self-perception of gender and eliminating the specificity of its rights, guarantees, protections and spaces. Like so, the political project of feminism is fragmented into minority and intersecting identity groups; and human rights, turned into the private desires of someone.