Concordance between the original and short version of the impulsive behaviour scale UPPS-P using an IRT model Lozano, Óscar M.; Díaz-Batanero, Carmen; Rojas, Antonio J.; Pilatti, Angelina; Fernández Calderón, Fermín The UPPS Impulsive Behaviour Scale (with five dimensions of impulsive behaviour) is being widely used. One of the handicaps of this instrument is its relatively long administration time. This has led to the development of a short version: SUPPS-P. There are no studies comparing the relationship between the SUPPS-P scores and the original UPPS-P scores. The objectives of this study, therefore, were to analyse the psychometric properties, concordance of person measures, and efficiency of the SUPPS-P compared to those on UPPS-P, applying an Item Response Theory Model. The UPPS-P and SUPPS-P were administered to 455 undergraduate students. Confirmatory factorial analysis replicated structures reported in previous studies: the five correlated factors structure and the model with two second-order factors (Urgency and Lack of Awareness) with Sensation Seeking dimension as a different factor. Rasch analysis show that both of the instruments presented adequate model-data fit. The results show the measurement for each dimension of UPPS-P offered more precision than SUPPS-P. The structure of items location was maintained in each dimension of SUPPS-P compared to the UPPS-P, but with better person and item separation indices of the UPPS-P dimensions. The concordance analysis reveals high correlations values between scores on both versions. From the standpoint of reducing items, it can be considered that the reduced version is more efficient. This study does not support the equivalence of items on the dimensions of Sensation Seeking and Lack of perseverance.

TRPC proteins contribute to development of diabetic retinopathy and regulate glyoxalase 1 activity and methylglyoxal accumulation Sachdeva, Robin; Schlotterer, Andrea; Schumacher, Dagmar; Matka, Christin; Mathar, Ilka; Dietrich, Nadine; Medert, Rebekka; Kriebs, Ulrich; Lin, Jihong; Nawroth, Peter; Birnbaumer, Lutz; Fleming, Thomas; Hammes, Hans Peter; Freichel, Marc Objective: Diabetic retinopathy (DR) is induced by an accumulation of reactive metabolites such as ROS, RNS, and RCS species, which were reported to modulate the activity of cation channels of the TRPC family. In this study, we use Trpc1/4/5/6 / compound knockout mice to analyze the contribution of these TRPC proteins to diabetic retinopathy. Methods: We used Nanostring- and qPCR-based analysis to determine mRNA levels of TRPC channels in control and diabetic retinae and retinal cell types. Chronic hyperglycemia was induced by Streptozotocin (STZ) treatment. To assess the development of diabetic retinopathy, vasoregression, pericyte loss, and thickness of individual retinal layers were analyzed. Plasma and cellular methylglyoxal (MG) levels, as well as Glyoxalase 1 (GLO1) enzyme activity and protein expression, were measured in WT and Trpc1/4/5/6 / cells or tissues. MG-evoked toxicity in cells of both genotypes was compared by MTT assay. Results: We find that Trpc1/4/5/6 / mice are protected from hyperglycemia-evoked vasoregression determined by the formation of acellular capillaries and pericyte drop-out. In addition, Trpc1/4/5/6 / mice are resistant to the STZ-induced reduction in retinal layer thickness. The RCS metabolite methylglyoxal, which represents a key mediator for the development of diabetic retinopathy, was significantly reduced in plasma and red blood cells (RBCs) of STZ-treated Trpc1/4/5/6 / mice compared to controls. GLO1 is the major MG detoxifying enzyme, and its activity and protein expression were significantly elevated in Trpc1/4/5/6-deficient cells, which led to significantly increased resistance to MG toxicity. GLO1 activity was also increased in retinal extracts from Trpc1/4/5/6 / mice. The TRPCs investigated here are expressed at different levels in endothelial and glial cells of the retina. Conclusion: The protective phenotype in diabetic retinopathy observed in Trpc1/4/5/6 / mice is suggestive of a predominant action of TRPCs in Müller cells and microglia because of their central position in the retention of a proper homoeostasis of the neurovascular unit.

Estado de conservación de las especies argentinas de Kaunia (Oxylobinae, Eupatorieae, Asteraceae); Conservation status of the Argentinean species of Kaunia (Oxylobinae, Eupatorieae, Asteraceae Viera Barreto, Jessica Noelia; Sancho, Gisela Las especies de Kaunia representan elementos ecológicamente importantes de las selvas subtropicales y matorrales montanos andinos. En Argentina habitan tres especies pertenecientes a este género. Dos de estas tres especies, K. lasiophthalma y K. saltensis, son componentes importantes de la Provincia Fitogeográfica de las Yungas. La tercera especie, K. rufescens, habita en la Provincia Fitogeográfica Paranaense. En el presente trabajo se brinda por primera vez un análisis del estado de conservación de las especies argentinas de Kaunia utilizando como base la metodología propuesta por la IUCN (International Union for Conservation of Nature and Natural Resources). Con la evidencia que se ha podido obtener sobre el estado general de las poblaciones de las especies de Kaunia analizadas, se obtuvo como resultado preliminar que la categoría de amenaza que mejor se adapta a su situación actual es “Menor preocupación” (LC).; The species of Kaunia represent ecologically important elements of the Andean subtropical forests and montane scrubs. Three species of this genus live in Argentina. Two of them, K. lasiophthalma and K. saltensis, are important components of the Yungas Phytogeographic Province. The third species, K. rufescens, lives in the Paranaense Province. The conservation status of the Argentinean species of Kaunia is herein presented for the first time following the methodology proposed by IUCN (International Union for the Conservation of Nature and Natural Resources). Based on the evidence obtained from populations of the species of Kaunia analyzed, we preliminary assign the conservation status “Low concern” (LC) which best represents the current situation of these species in Argentina

Una nueva especie de Leucheria (Asteraceae), endémica de Chile; A new species of Leucheria (Asteraceae), endemic to Chile Katinas, Liliana; Crisci, Jorge Victor; Marticorena, Alicia Se describe e ilustra una nueva especie de Leucheria Lag. (Asteraceae, Nassauvieae), L. meladensis Katinas, Crisci & A.E. Martic., con hojas enteras, elípticas, pecioladas y levemente pubescentes. Esta sería la única especie endémica de la Reserva Nacional Bellotos del Melado, a los 35º S, en la provincia de Linares, región del Maule en Chile. Se presenta una clave de las especies que habitan la provincia de Linares.; A new species of Leucheria (Asteraceae), endemic to Chile. A new species of Leucheria Lag. (Asteraceae, Nassauvieae), L. meladensis Katinas, Crisci & A.E. Martic, with entire, elliptic, petiolate, scarcely pubescent leaves is described and illustrated. This would be the only species endemic to Reserva Nacional Bellotos del Melado, at 35º S, in Linares province of the Maule region, Chile. A key to the species of Leucheria that inhabit the Linares province is presented.

El tratamiento del suelo rural en el planeamiento francés a lo largo del siglo XX: el caso de Lyon; The treatment of rural land in French planning throughout the 20th century: the case of Lyon Orduña Giró, Paula; Pesoa, Melisa; Sabaté Bel, Joaquín Las ideas que orientan el planeamiento urbanístico se reajustan a lo largo del siglo XX. Los planes incorporan nuevos conceptos e instrumentos para definir el rol del suelo no urbanizado en sistemas urbanos dinámicos, convirtiéndose en pieza esencial del proyecto metropolitano. En este artículo analizamos los cambios en la normativa urbanística, territorial, agrícola y ambiental en el caso de Francia, y de Lyon en particular. Para ello distinguimos cuatro etapas, desde las primeras iniciativas de ordenación territorial de principios del siglo XX, hasta la última generación de Esquemas de coherencia territorial. Este repaso histórico permite observar cómo se articula la categoría de suelo rural metropolitano en Lyon, región que cuenta con una reconocida tradición urbanística y más de cincuenta años de planeamiento metropolitano que le conceden continuidad y capacidad de innovación.; There has been a reassessment of planning concerns throughout the twentieth century. Plans integrate new concepts and operational tools to define the role of non-urbanized land in dynamic urban systems, becoming an essential component of the metropolitan project. In this article we analyze the changes in the urban, regional, agricultural and environmental regulation in the case of France in general and Lyon, in particular. Therefore we distinguish four stages from the first initiatives of regional organization in the early 1900's, to the last Territorial coherence schemes. This historical review demonstrates the articulation of the category of metropolitan rural land in Lyon, this region owns a long tradition of urban planning and more than fifty years of metropolitan planning experience attesting continuity and capacity of innovation.

Metallated porphyrin-doped conjugated polymer nanoparticles for efficient photodynamic therapy of brain and colorectal tumor cells Ibarra, Luis Exequiel; Porcal, Gabriela Valeria; Macor, Lorena Paola; Ponzio, Rodrigo Andrés; Spada, Ramiro Martín; Lorente, Carolina; Chesta, Carlos Alberto; Rivarola, Viviana Alicia; Palacios, Rodrigo Emiliano Assess biocompatibility, uptake and photodynamic therapy (PDT) mechanism of metallated porphyrin doped conjugated polymer nanoparticles (CPNs) in human brain and colorectal tumor cells and macrophages. CPNs were developed employing 9,9-dioctylfluorene-altbenzothiadiazole, an amphiphilic polymer (PS-PEG-COOH), and platinum octaethylporphyrin. T98G, SW480 and RAW 264.7 cell lines were exposed to CPNs to assess uptake and intracellular localization. Additionally, a PDT protocol using CPNs was employed for the in vitro killing of cancer and macrophage cell lines. CPNs were well incorporated into glioblastoma and macrophage cells with localization in lysosomes. SW480 cells were less efficient incorporating CPNswith localization in the plasma membrane. In all cell lines PDT treatment was efficient inducing oxidative stress that triggered apoptosis.

The enhanced electrochemical response of Sr(Ti0.3Fe0.7Ru0.07)O3-: δ anodes due to exsolved Ru-Fe nanoparticles Glaser, R.; Zhu, T.; Troiani, Horacio Esteban; Caneiro, Alberto; Mogni, Liliana Verónica; Barnett, S. A mixed conducting oxide with a nominal composition Sr(Ti0.3Fe0.7Ru0.07)O3-δ (STFRu) is studied, in comparison with SrTi0.3Fe0.7O3-δ (STF) oxide, as an anode for solid oxide fuel cells. Exposing STFRu to reducing fuel conditions at 800 °C for 4 h results in the exsolution of essentially all of the Ru and a small fraction of the Fe from the oxide, and the formation of Ru1-xFex nanoparticles on the oxide surfaces. Most of the nanoparticles have the hexagonal structure expected for Ru-rich alloys, and thermogravimetric analysis suggests the composition x ∼ 0.2. A small fraction of bcc-structure, presumably Fe-rich, nanoparticles are also detected. Comparison of cells with STFRu and STF anodes shows that the presence of Ru induces a reduced polarization resistance and increases the maximum power density under most cell operating conditions, particularly at lower temperatures and hydrogen partial pressures. For example, at 700 °C and 30% H2 fuel, the maximum power density is 0.1 W cm-2 for STF compared to 0.3 W cm-2 for STFRu. There is also a significant change in the shape of the current-voltage curves and the pH2-dependence of the anode polarization resistances RP,A ∝ (pH2)-m, from m ∼ 0.5-1.0 for STF to m ∼ 0.11-0.29 for STFRu; these suggest that Ru1-xFex nanoparticles improve anode performance by promoting hydrogen adsorption.

On the distortions in calculated GW parameters during slanted atmospheric soundings de la Torre, Alejandro; Alexander, Pedro Manfredo; Schmidt, Torsten; Llamedo Soria, Pablo Martin; Hierro, Rodrigo Federico The significant distortions introduced in the measured atmospheric gravity wavelengths by soundings other than those in vertical and horizontal directions, are discussed as a function of the elevation angle of the sounding path and the gravity wave aspect ratio. Under- or overestimation of real vertical wavelengths during the measurement process depends on the value of these two parameters. The consequences of these distortions on the calculation of the energy and the vertical flux of horizontal momentum are analyzed and discussed in the context of two experimental limb satellite setups: GPS-LEO radio occultations and TIMED/SABER ((Atmosphere using Broadband Emission Radiometry/Thermosphere-Ionosphere-Mesosphere-Energetics and Dynamics)) measurements. Possible discrepancies previously found between the momentum flux calculated from satellite temperature profiles, on site and from model simulations, may to a certain degree be attributed to these distortions. A recalculation of previous momentum flux climatologies based on these considerations seems to be a difficult goal.

Técnicas Paleontológicas Isasi, Marcelo Pablo; Brissón Egli, Federico Cuando recorremos las salas de exhibición delos museos de ciencias naturales solemos encontrarnosante magníficos ejemplares deanimales extinguidos de los que solo conocemossus esqueletos fósiles (o partes de ellos),montados de una manera que cautiva nuestra imaginación.Sin embargo, por lo general desconocemos el largocamino que debieron recorrer esos fósiles para quelos podamos apreciar en el museo. Ese camino comienzacon su hallazgo en el campo por los paleontólogos,normalmente en lugares remotos y a veces poco accesibles,y sigue con su extracción de los estratos geológicosen que se preservaron por millones de años, su trasladoa un centro de investigación o un museo, y su cuidadosapreparación, por la que se separan los huesos de la roca.Esto posibilita el detallado estudio anatómico y, en casode que los materiales estén bien preservados, su exhibiciónal público.

Discovery of novel bovine viral diarrhea inhibitors using structure-based virtual screening on the envelope protein E2 Bollini, Mariela; Leal, Emilse Soledad; Adler, Natalia Sol; Aucar, María Gabriela; Fernandez, Gabriela Araceli; Pascual, María José; Merwaiss, Fernando; Alvarez, Diego Ezequiel; Cavasotto, Claudio Norberto Bovine viral diarrhea virus (BVDV) is a member of the genus Pestivirus within the family Flaviviridae. BVDV causes both acute and persistent infections in cattle, leading to substantial financial losses to the livestock industry each year. The global prevalence of persistent BVDV infection and the lack of a highly effective antiviral therapy have spurred intensive efforts to discover and develop novel anti-BVDV therapies in the pharmaceutical industry. Antiviral targeting of virus envelope proteins is an effective strategy for therapeutic intervention of viral infections. We performed prospective small-molecule high-throughput docking to identify molecules that likely bind to the region delimited by domains I and II of the envelope protein E2 of BVDV. Several structurally different compounds were purchased or synthesized, and assayed for antiviral activity against BVDV. Five of the selected compounds were active displaying IC50 values in the low- to mid-micromolar range. For these compounds, their possible binding determinants were characterized by molecular dynamics simulations. A common pattern of interactions between active molecules and aminoacid residues in the binding site in E2 was observed. These findings could offer a better understanding of the interaction of BVDV E2 with these inhibitors, as well as benefit the discovery of novel and more potent BVDV antivirals.

Reactive oxygen species and nitric oxide are involved in polyamine-induced growth inhibition in wheat plants Recalde, Laura; Vazquez, Analia; Groppa, María Daniela; Benavides, Maria Patricia Polyamines (PAs) produce H2O2 and nitric oxide (NO) during their normal catabolism and modulate plant growth and development. To explore the biochemical basis of PAs-induced growth inhibition in Triticum aestivum L seedlings, we examined the role of O2·-, H2O2 or NO in shoot and root development. Although all PA treatments resulted in a variable reduction of root and shoot elongation, spermine (Spm) caused the greater inhibition in a similar way to that observed with the NO donor, sodium nitroprusside (SNP). In both cases, O2·- production was completely blocked whereas H2O2 formation was high in the root apex under SNP or Spm treatments. Catalase recovered root and shoot growth in SNP but not in Spm-treated plants, revealing the involvement of H2O2 in SNP-root length reduction. The addition of the NO scavenger, cPTIO, restored root length in SNP- or Spm-treated plants, respectively, and partially recovered O2·- levels, compared to the plants exposed to PAs or SNP without cPTIO. A strong correlation was observed between root growth restoration and O2·- accumulation after treating roots with SNP + aminoguanidine, a diamine oxidase inhibitor, and with SNP + 1,8-diaminoctane, a polyamine oxidase inhibitor, confirming the essential role of O2·- formation for root growth and the importance of the origin and level of H2O2. The differential modulation of wheat growth by PAs through reactive oxygen species or NO is discussed.

Distinguishing Quaternary glyptodontine cingulates in South America: How informative are juvenile specimens? Luna, Carlos; Cerda, Ignacio Alejandro; Zurita, Alfredo Eduardo; González, Romina; Prieto, María Cecilia; Mothé, Dimila; Avilla, Leonardo The subfamily Glyptodontinae (Xenarthra, Cingulata) comprises one of the most frequently recorded glyptodontids in South America. Recently, the North American genus Glyptotherium was recorded in South America, in addition to the genus Glyptodon. It has been shown that both genera shared the same geographic distribution in central-north and eastern areas of South America (Venezuela and Brazil, respectively). Although some characters allow differentiation between adult specimens of both genera, the morphological distinction between these two genera is rather difficult in juvenile specimens. In this contribution, a detailed morphological, morphometric and histological survey of a juvenile specimen of Glyptodontinae recovered from the Late Pleistocene of northern Brazil is performed. The relative lower osteoderms thickness, the particular morphology of the annular and radial sulci and the distal osseous projections of the caudal osteoderms suggest that the specimen belongs to the genus Glyptotherium. In addition, the validity of some statistical tools to distinguish between different ontogenetic stages and in some cases between genera is verified. The osteoderm microstructure of this juvenile individual is characterized by being composed of a cancellous internal coresurrounded by a compact bone cortex. Primary bone tissue mostly consists of highly vascularized, woven-fibered bone tissue. Unlike that observed in adult Glyptodontinae, both the Sharpey fibers and the fibrous and laminar parallel bone tissue as secondary bone are absent. This study enhances our knowledge about those morphological and histological changes that occur through the ontogeny in glyptodonts.

Círculos de tiza: Notas sobre exilio y enfermedad en Reinaldo Arenas León, Denise En su ensayo sobre literatura y enfermedad, Roberto Bolaño construye una tríada íntima de experiencia que nos guía a través de las motivaciones fundamentales que hay detrás de toda poesía y que está constituida ciertamente por los viajes, el sexo y los libros. Me propongo indagar en el presente trabajo cómo funciona esta tríada en la obra del cubano Reynaldo Arenas, especialmente en su autobiografía, Antes que anochezca, donde la enfermedad re direcciona la trayectoria del viaje. Si la fuga funciona como una constante que tensiona la obra y la vida de Arenas, en su autobiografía exilio y enfermedad se fusionan como signos intercambiables.; In his essay on literature and disease, Roberto Bolaño builds a trio arround intimate experiences that guides us through the fundamental motivations behind all poetry: travel, sex and books. I intend in this paper to research how this triad operates in the work of the Cuban writer Reynaldo Arenas, especially in his autobiography, Before Night Falls. Here, the disease redirects the path of traveling. If runaway functions as a constant in Arenas's works, in his autobiography desertion and disease look like interchangeable signs.

Physicochemical and rheological properties of mucilage extracted from Opuntia ficus indica (L. Miller): Comparative study with guar gum and xanthan gum Quinzio, Claudia Marcela; Ayunta, Carolina Anabel; Alancay, Matias Miguel; Lopez, Beatriz Alicia; Iturriaga, Laura Beatriz The physicochemical and rheological properties of aqueous solutions of the mucilage isolated from Opuntia ficus indica (L. Mill) at different concentration (0.5, 1, 1.5 and 4.5% w/v) were examined. The intrinsic viscosity [η] found for precipitate mucilage (PM) and dialyzed mucilage (DM) were 22.6 and 15.3 dl/g respectively. Electrophoretic measurements showed that the zeta potential of PM and DM was negative in all the pH range studied. PM reduced the surface tension of water and was concentration dependent. The surface activity of PM (57 mN/m) was similar to that of guar gum (55 mN/m) and xanthan gum (52 mN/m) at 1.5% (w/v) concentration. A non-Newtonian shear-thinning behavior was observed. The Ostwald–de Waele model successfully correlated the viscosity–shear rate. At equal hydrocolloid concentration, the consistency coefficients (k) of mucilage solutions were lower than those of guar gum (GG) and xanthan gum (XG). However, the consistency coefficient of a mucilage solution at 4.5% (w/v) (20.9 Pa s) was in the same order as that shown by GG at 1.5% (w/v) (28.8 Pa s) aqueous solution. No effects of pH and ionic strength on the viscosity of PM and DM were observed. The mechanical spectra showed a crossover point between G′ and G″ at low mucilage concentrations of 0.5 and 1% (w/v), exhibiting higher relaxation time than GG. The more concentrated solutions of PM and DM (1.5 and 4.5% w/v) displayed a predominant elastic behavior and did not meet the Cox-Merz rule, similarly to GX. The more concentrated solutions of PM and DM did not meet the Cox-Merz rule. This behavior would suggest the formation of colloidal aggregates.

Electrosorption of a modified electrode in the vicinity of phase transition: A Monte Carlo study Gavilán Arriazu, Edgardo Maximiliano; Pinto, Oscar Alejandro We present a Monte Carlo study for the electrosorption of an electroactive species on a modified electrode. The surface of the electrode is modified by the irreversible adsorption of a non-electroactive species which is able to block a percentage of the adsorption sites. This generates an electrode with variable connectivity sites. A second species, electroactive in this case, is adsorbed in surface vacancies and can interact repulsively with itself. In particular, we are interested in the analysis of the effect of the non-electroactive species near of critical regime, where the c(2 × 2) structure is formed. Lattice-gas models and Monte Carlo simulations in the Gran Canonical Ensemble are used. The analysis conducted is based on the study of voltammograms, order parameters, isotherms, configurational entropy per site, at several values of energies and coverage degrees of the non-electroactive species.

Manejo de malezas en pasturas perennes en base a leguminosas, con énfasis en el control de cardos Montoya, Jorgelina Ceferina; Berhongaray, Gonzalo; Romano, Nicolás F. La presencia de malezas en pasturas perennes en base a leguminosas provoca una baja eficiencia en la implantación, reduce la producción de materia seca y la calidad del forraje. El éxito del manejo integrado de malezas se basa en ajustar las estrategias de control al problema de malezas específico en el campo. Los productores deben saber, no únicamente, cuáles especies están presentes en el lote (y cuántas de ellas) sino que también deben entender la distribución y los estados de desarrollo de dichas malezas en el campo. La mayoría de los bancos de semilla están compuestos por diversas especies. El conocimiento de cuándo cada una de las especies emergen en el año es importante para planificar un efectivo programa de control de malezas. Cada especie tiene uno o más períodos de emergencia pudiendo variar el inicio de la emergencia de un año a otro dependiendo de las condiciones climáticas. Sin embargo, el orden de emergencia entre especies se mantiene relativamente constante. El grupo de los cardos es uno de los más problemáticos al momento de su manejo. Una de las principales características de estas especies es que en general no hay herbicidas residuales que ofrezcan un buen control preemergente, la mayoría de ellos son herbicidas postemergentes. Si bien éstos pueden ser muy eficaces, la baja eficacia preemergente de posteriores cohortes reduce la calidad de los tratamientos en el corto plazo. A los fines de aumentar la eficacia y eficiencia de dichos tratamientos postemergentes es de suma utilidad disponer de la información de los flujos de emergencia de las especies más frecuentes y problemáticas. De esta forma se logrará definir el momento más apropiado para la intervención postemergente con herbicidas.

Carvone-loaded LDPE films for active packaging: Effect of supercritical CO2-assisted impregnation on loading, mechanical and transport properties of the films Goñi, Maria Laura; Gañan, Nicolas Alberto; Martini, Raquel Evangelina; Andreatta, Alfonsina Ester In this work, low density polyethylene (LDPE) films were loaded by scCO2-assisted impregnation with R-(−)-carvone, the main component of M. spicata and A. polystachya essential oils with antimicrobial and insecticidal activity. Impregnation runs were performed in a lab-scale high-pressure cell, and the effect of CO2 density (240?700 kg m−3) and temperature (35?60 °C) on impregnation yield was evaluated. Impregnation yields of 2.0?4.8% (w/w) were obtained, achieving higher values at low CO2 density. Thermal and mechanical properties of the films, before and after impregnation, were also investigated. The diffusion coefficient of carvone in scCO2-swollen films was estimated by impregnating film rolls and modeling the concentration profile through the roll thickness using an analytical solution of second Fick´s law. Release profiles into air were determined, allowing to estimate diffusivity values in non-swollen films at ambient conditions.

Key acclimation responses to phosphorus deficiency in maize plants are influenced by exogenous nitric oxide Ramos Artuso, Facundo Antonio; Galatro, Andrea Verónica; Buet, Agustina; Santa Maria, Guillermo Esteban; Simontacchi, Marcela Silvia Improving phosphorus (P) acquisition and utilization in crops is of great importance in order to achieve a good plant nutritional state and maximize biomass production while minimizing the addition of fertilizers, and the concomitant risk of eutrophication. This study explores to which extent key processes involved in P-acquisition, and other acclimation mechanisms to low P supply in maize (Zea mays L.) plants, are affected by the addition of a nitric oxide (NO) donor (S-nitrosoglutathione, GSNO). Plants grown in a complete culture solution were exposed to four treatments performed by the combination of two P levels (0 and 0.5 mM), and two GSNO levels (0 and 0.1 mM), and responses to P-deprivation were then studied. Major plant responses related to P-deprivation were affected by the presence of the NO donor. In roots, the activity of acid phosphatases was significantly increased in P-depleted plants simultaneously exposed to GSNO. Acidification of the culture solution also increased in plants that had been grown in the presence of the NO donor. Furthermore, the potential capability displayed by roots of P-deprived plants for P-uptake, was higher in the plants that had been treated with GSNO. These results indicate that exogenous NO addition affects fundamental acclimation responses of maize plants to P scarcity, particularly and positively those that help plants to sustain P-acquisition under low P availability.

Configuraciones militantes contemporáneas. Una propuesta metodológica para pensar el compromiso político; Contemporary militant configurations. A methodological proposal to think about political commitment Aiziczon, Fernando Cristian En este artículo proponemos una manera posible de pensar la militancia política en su vínculo con el problema del compromiso político y la acción. Luego de presentar estas relaciones, problematizamos la idea de configuraciones militantes, sugiriendo parámetros de referencia aplicables al caso de la militancia de izquierdas en la Argentina contemporánea e interrogando sobre los quiebres y continuidades que habilitan el despliegue de formas de militancia en determinados contextos históricos. Trabajamos sobre la hipótesis de que el debate reciente sobre la violencia revolucionaria en las organizaciones políticomilitares de los años sesenta-setenta, superpuesto con las discusiones emergentes tras la crisis sociopolítica de 2001, señalarían las condiciones de posibilidad para la emergencia de una nueva configuración militante de carácter transicional en la época actual.
; In this article we propose a possible way of thinking about the political militancy in its connection with the problem of political commitment and action. After presenting these relations, we problematized the idea of militant configurations, suggesting reference parameters applicable to the case of leftist militancy in contemporary Argentina and questioning about the breakthroughs and continuities that enable the deployment of forms of militancy in certain historical contexts. We work on the hypothesis that the recent debate on revolutionary violence in political-military organizations of the 60s and 70s, superimposed on the discussions emerging after the socio-political crisis of 2001, it would indicate the conditions of a possibility for the emergence of a new militant configuration of a transitional nature in the current epoch.

Ticks (Acari: Ixodidae) of Nepal: First record of Amblyomma varanense (Supino), with an update of species list Pun, Shyam Kumar; Guglielmone, Alberto Alejandro; Tarragona, Evelina Luisa; Nava, Santiago; Maharjan, Mahendra Males and females specimens of Amblyomma were collected from Orthriophis hodgsoni (Squamata: Colubridae) caught during routine herpetological work in Kathmandu. Morphological characteristics led to the diagnosis of A. varanense, constituting the second Nepalese species for the genus after the collection of Amblyomma gervaisi, also from a colubrid snake, almost 100 years ago. Amblyomma varanense is the 55th species found in the country, and preceded for the collection of 21 species of Haemaphysalis, 14 Ixodes, 6 Rhipicephalus, 6 Hyalomma, 4 Dermacentor, 1 Amblyomma, 1 Anomalohimalaya and 1 species of Nosomma. Eleven and 19 species have been found on humans and domestic mammals, respectively, evidencing the medical and economic importance of Nepalese Ixodidae.