5,334 research outputs found

    Cochain complexes over a functor

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    In this paper we propose unifying the categories of cochain complexes Ch(C)\text{Ch}(\mathcal{C}) and modules A^-mod\widehat{A}\text{-mod} over a repetitive algebra A^\widehat{A}. Motivated by their striking similarities and importance, we introduce a novel category encompassing both. Our analysis explores key properties of this unified category, highlighting its parallels and divergences from the original structures. We study whether it preserves crucial aspects like limits, colimits, products, coproducts, and abelianity. Besides, we establish a family of projective and injective indecomposable objects within this framework. Moving beyond theoretical foundations, we examine the influence and interaction over these novel categories of the category of endofunctors and its monoidal structure. Finally, we explore the implications of our constructions over representation theory of algebras and algebraic geometry

    The Privatization of Antarctica

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    The seventh continent, Antarctica, is a no man’s land in terms of economic development. This is not due to its harsh weather conditions. Parts of Alaska, Canada and Russia are almost equally inhospitable. Rather, this Article argues that Antarctica’s economic isolation is the result of political paralysis and a lack of appreciation for private property rights. This Article makes the case for adding Antarctica to the family of nations, whether as one or several countries

    Cucurbit Powdery Mildew: First Insights for the Identification of the Causal Agent and Screening for Resistance of Squash Genotypes (Cucurbita moschata (Duchesne ex Lam.) Duchesne ex Poir.) in Mendoza, Argentina

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    The cucurbit powdery mildew (CPM) caused by different fungal species is a major concern for cucurbit crops around the world. In Argentina CPM constitutes the most common and damaging disease for cucurbits, especially for squash crops (Cucurbita moschata). The present study displays initial insights into the knowledge of the disease in western Argentina, including the determination of the prevalent species causing CPM, as well as the evaluation of the resistance of squash cultivars and breeding lines. Fungal colonies were isolated from samples collected in Mendoza province, Argentina. A field trial was also performed to assess the resistance of five squash accessions, including commercial cultivars and breeding lines. The severity of CPM was analyzed and epidemiological models were built based on empirical data. The morphological determinations and analysis with specific molecular markers confirmed Podosphaera xanthi as the prevalent causal agent of CPM in Mendoza. The results od the field trial showed differences in the resistance trait among the squash accessions. The advanced breeding line BL717/1 showed promising results as source of CPM resistance for the future development of open pollinated resistant cultivars, a crucial tool for an integrative control of the disease.EEA La ConsultaFil: Caligiore Gei, Pablo Fernando. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria La Consulta; ArgentinaFil: Della Gaspera, Pedro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria La Consulta; ArgentinaFil: Benitez, Eliana. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria La Consulta; ArgentinaFil: Tarnowski, Christian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria La Consulta; Argentin

    Mantenimiento de equipos y de herramientas. Cartilla 1

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    La cartilla describe las principales herramientas usadas en la actividad agrícola, importancia de dar un mantenimiento apropiado a las herramientas, formas de hacer mantenimiento, encabado y afilado de estasThe booklet describes the main tools used in agricultural activity, the importance of giving proper maintenance to the tools, ways of doing maintenance, encasing and sharpening theseAnalice la alimentación de su ganado -- Analice la sanidad en su ganadería -- Analice la reproducción de su ganado -- Analice el manejo de su ganado24 página

    Evaluación del nivel de eficiencia física a estudiantes de Medicina

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    Introducción: La calidad del proceso enseñanza-aprendizaje en las clases de Educación Física, depende del desarrollo adecuado de habilidades y capacidades físicas, esto implica la búsqueda de vías más factibles para poder determinar con mayor acierto las deficiencias de nuestros estudiantes.Objetivo: Evaluar el nivel de eficiencia física a estudiantes de Medicina.Material y Métodos: Se realizó un estudio explicativo con diseño experimental, en la Filial de Ciencias Médicas "Gabriela Arias" del municipio de Cárdenas, en el curso escolar 2015-2016. El universo estuvo constituido por 54 estudiantes de Medicina de primer año quienes cumplieron con los criterios de inclusión; seleccionaron una muestra de 20, que se distribuyeron aleatoriamente en dos grupos, al grupo control se les aplicó las pruebas de aptitud físicas integradoras del programa de la signatura Educación Física y al grupo estudio las pruebas funcionales de terreno.Resultados: Las pruebas de aptitud físicas integradoras establecidas por el programa, no poseen ninguna prueba que determine la capacidad aeróbica y, por ende, los P1 no cuentan con la calidad científica requerida. Las pruebas funcionales de terreno permiten realizar una correcta planificación de las cargas de entrenamiento y lograr cumplir con los objetivos de la preparación, conociendo las características funcionales de los estudiantes y sus respuestas a las cargas de entrenamiento.Conclusiones: La aplicación de las pruebas funcionales de terreno permite una mayor integralidad en el proceso de evaluación de los diferentes sistemas energéticos, aeróbicos y anaeróbicos. Palabras claves: Ergometría, educación y entrenamiento físico, ejercicio aeróbico, evaluación, anaerobiosis.   </strong

    Olivine-lamproite from Ybytyruzú Lamproite Field, Eastern Paraguay

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    En el presente trabajo se realiza la descripción de la geología, la química mineral, comentarios sobre su geoquímica y caracterización de la intrusión Yzu-4 emplazada en el Campo de rocas lamproíticas del Ybytyruzú, Paraguay Oriental. De acuerdo a la petrografía y química mineral, con refuerzos de química de roca (elementos mayores, menores, trazas e isotopos de Sr y Nd), Yzu-4 se trata de una sanidina diopsido analcima, olivino lamproita expuesta junto a un inferido (a partir de imágenes de satélite Landsat 4-5 y 7) conducto alimentador (feeder) de una intrusión en forma de pipe de unos 900x900 metros de diámetro y que está situada a menos de 1500 metros de un otro conducto de olivino lamproíta rica en micas (también inferido como pipe diamantífera). El Campo de lamproítas del Ybytyruzú yace sobre el corazón Archon profundo del cratón Rio de la Plata.In the present work is carried out the description of geology, mineral chemistry,geochemistry, and characterization of the Yzu-4 intrusion that occurs in the Ybytyruzú lamproites field,Eastern Paraguay. According to the petrography and mineral chemistry, with reinforcements of rockchemistry (major, minor and traces elements and isotopes of Sr and Nd), Yzu-4 belongs to sanidinediopside analcime, olivine lamproite exposed next to a inferred (from Landsat 4-5 and 7 satellite imagery)pipe-shaped intrusion of 900x900 meters in diameter and located less than 1500 meters from anotherintrusion of diamond- bearing olivine lamproite rich in micas (also inferred as pipe). The Ybytyruzúlamproites field lies on the deep Archon heart of Rio de la Plata craton.Fil: Baez Presser, Jaime Leonardo. Jaime Presser Exploraciones; ParaguayFil: Vladykin, Nikolay V.. Institute Of Geochemistry; RusiaFil: Bitschene, Peter Rene. Museo Ciencias Naturales de Gerolstein; AlemaniaFil: Tondo, Matías J.. Universidad Nacional de Asunción; ParaguayFil: Acevedo, Rogelio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Alonso, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Salta; ArgentinaFil: Benitez, Pedro. Universidad Nacional de Asunción; Paragua

    Impact of hip abductor and adductor strength on dynamic balance and ankle biomechanics in young elite female Basketball players

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    This study aimed to evaluate, in an isolated and relative manner, hip abductor (ABD) and adductor (AD) strength and to study the extent to which these factors are related to balance and ankle dorsiflexion mobility in young elite female basketball players. Sixty trainee-level elite female basketball players (13-18 years old), who voluntarily agreed to participate in the study, were divided into three subgroups based on competition age divisions (U14, U16, U18). Isometric hip ABD and AD strength in each leg was evaluated using the ForceFrame Strength Testing System, also calculating the strength ratio and imbalance between legs. Y Balance Test (YBT) and ankle dorsiflexion mobility were also assessed. ANOVA was used for between-group differences analysis. Likewise, the impact of hip strength on balance and ankle mobility was analyzed using Pearson's correlation coefficient. A linear regression model for dependent variables was created with all variables that exhibited significant correlations. A between-group comparison analysis for the three competition age subgroups (U14, U16, U18) revealed non-significant differences (p > 0.005) for the hip strength variables except for hip ABD strength. The correlation study showed low-moderate effect sizes for hip ABD (in both the contralateral and homolateral limb) and AD strength (only the homolateral limb) with YBT and ankle dorsiflexion. However, when performing a regression model, only right hip ABD significantly predicted right limb YBT scores (β = 0.592, p = 0.048). The present study indicated that, although both hip ABD and AD strength correlate with balance and ankle mobility with low-moderate effect sizes, only hip ABD strength was found to significantly predict YBT scores. Therefore, the potential role of hip ABD strength in particular, but also hip AD strength, for monitoring and enhancing balance and ankle mobility outcomes, should be taken into consideration when designing and implementing preventive strategies for lower-limb injuries

    Mycoremediation of high concentrations of polychlorinated biphenyls with Pleurotus sajor-caju LBM 105 as an effective and cheap treatment

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    Polychlorinated biphenyls (PCBs) are exceptionally stable organic pollutants. An effective and economically feasible process is essential for their removal. Mycoremediation using white-rot fungal strains proved as a highly effective approach that has not been thoroughly investigated. The aim of this work was to evaluate PCBs remediation efficacy applying Pleurotus sajor-caju LBM 105. Axenic cultures of the fungus, either in complex or N-limited liquid media, were spiked with 217 mg L-1 of a technical mixture of Aroclor 1242, 1254 y 1260 in oil transformer. PCBs removal capacity, toxicity reduction, changes in fungal morphology and laccase expression caused by pollutant addition and the cost-effectiveness of the remediation treatment were assessed when growing the fungus under two different nutritional conditions. P. sajor-caju LBM 105 could remove 97.7% and 91.7% of the PCBs mixture and reduced the toxicity in complex and mineral media respectively after 35 days of incubation. The addition of PCBs to P. sajor-caju LBM 105 culture media resulted in an increase in hyphal diameter, changes in biomass, glucose consumption, proteins and laccase secretion. A 3-fold rise in laccase activity was detected in both media at 28 day. Laccase mRNA augmented 16% and 91% at 21 and 28 days respectively when PCBs were added to the N-limited liquid media. Mycoremediation of PCBs with P. sajor-caju LBM 105 cultivated in N-limited liquid medium is an effective low-cost (0.69 $ g-1d-1) alternative technique for PCBs treatment.Fil: Sadañoski, Marcela Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Departamento de Bioquímica Clínica. Laboratorio de Biotecnología Molecular; ArgentinaFil: Benitez, Silvana Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Departamento de Bioquímica Clínica. Laboratorio de Biotecnología Molecular; ArgentinaFil: Fonseca, Maria Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Departamento de Bioquímica Clínica. Laboratorio de Biotecnología Molecular; ArgentinaFil: Velázquez, Juan Ernesto. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Departamento de Bioquímica Clínica. Laboratorio de Biotecnología Molecular; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Zapata, Pedro Darío. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Departamento de Bioquímica Clínica. Laboratorio de Biotecnología Molecular; ArgentinaFil: Levin, Laura Noemí. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Micología y Botánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Micología y Botánica; ArgentinaFil: Villalba, Laura Lidia. Universidad Nacional de Misiones. Facultad de Ciencias Exactas Químicas y Naturales. Departamento de Bioquímica Clínica. Laboratorio de Biotecnología Molecular; Argentin
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