La independencia del Directorio y su impacto en el desempeño: evidencia en el sector bancario argentino

En los últimos años, los bancos argentinos han avanzado en la aplicación de buenas prácticas de gobierno societario. Se construye un índice que mide la adopción de algunas de estas prácticas para bancos en Argentina durante 2015. Seguidamente, en un enfoque de corte transversal, se analiza la relación entre el índice y la performance de los bancos, medida como el Rendimiento sobre Activos (ROA). Esta relación no es estadísticamente significativa, por lo que se podría interpretar que la implementación de las prácticas no impacta de forma negativa en la performance.In recent years, Argentine banks have implemented good corporate governance practices. In this paper, we build an index to measure the adoption of some of these practices by banks in Argentina during 2015. Next, we apply a cross-sectional approach to analyse the relationship between the index and banks’ performance, measured as the Return on Assets. This relationship proves not to be statistically significant, which could lead us to interpret that the implementation of such practices does not negatively affect performance

Cinéphiles et cinéphilie : le jugement de goût ne s'apprend pas

Discussion avec les auteurs d'un renouvellement de la notion de cinéphilie sur des bases sociologiques de manière à en élargir le sens au-delà de la conception élitiste dominante

Variation in leaf morphology of the invasive cat's claw creeper Dolichandra unguis-cati (Bignoniaceae)

The invasive liana cat’s claw creeper Dolichandra unguis-cati (L.) L.G. Lohmann (syn. Macfadyena unguis-cati (L.) A.H. Gentry) exhibits intraspecific variation in leaf morphology, but this is rarely noted in the published literature. The present study documents variation in leaf morphology in two forms of the species that occur in Australia (long pod and short pod). Leaf morphology is compared between the two forms and the position of the shoots (trunk and ground) at the only two sites in which they co-occur. Leaves were categorised on the basis of leaflet number and the presence or absence of tendrils. Simple leaves were produced mainly on shoots growing along the ground and were more abundant in the short-pod form. Long-pod plants were dominated by bifoliate leaves with tendrils. Cat’s claw creeper exhibits considerably wider variation in leaf morphology than recorded previously. Variations in leaf morphology may be linked to differences in the genotype, developmental stage and plastic responses of the plants. Understanding these variations may have implications for taxonomic delimitation and improved management, particularly biological control involving leaf-feeding insects

Karyotypes and DNA content in Bignoniaceae

Cytogenetic studies in 22 Bignoniaceae species were performed. Most taxa are from Argentina, one from Brazil, and two are cultivated (from South Africa and USA). All data are new, including first counts for Bignonia binata, Handroanthus ochraceus, Tabebuia aurea and the genus Podranea. Most taxa are diploid (2n= 40): members of tribes Bignonieae (Adenocalymma, Amphilophium, Bignonia, Cuspidaria, Dolichandra, Fridericia, and Tynanthus), Catalpeae (Catalpa) and the Tabebuia alliance (Handroanthus and Tabebuia). Dolichandra unguis-cati and Handroanthus chrysotrichus were polyploid (2n= 80). Tribes Jacarandeae (Jacaranda) and Tecomeae (Tecoma) were unusual (with 2n= 36), whereas Podranea ricasoliana(Tecomeae) had 2n=38. The basic numberx= 20 is proposed as the base number for the family. Chromosomes are small. The average length was 1.21 μm. Average haploid karyotype length was 28.13μm, ranging from 18.63 in Dolichandra cynanchoidesto 37.63 in D. unguis-cati. Type m chromosomes were the most common. One to five sm pairs were found in 16 species and one st pair inCuspidaria convolutaandPodranea ricasoliana. One to four microsatellites, in long or short arms, were detected in nine species. Karyotypes are symmetrical. Asymmetry indices ranges were: A1= 0.11?0.23, A2= 0.14?0.22. The karyotypes of P. ricasoliana and C. convoluta were the most asymmetrical. Most species were karyologically indistinguishable based on conventional staining, but some could be distinguished by a combination of traits. 1C nuclear DNA content for 12 species were within the range 0.64?2.02 pg. In Bignoniaceae there is a common karyotypical pattern of mostly small m chromosomes with few cryptic chromosomal rearrangements.Fil: Piazzano, Marianela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba; ArgentinaFil: Las Peñas, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba; ArgentinaFil: Chiarini, Franco Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba; ArgentinaFil: Bernardello, Gabriel Luis Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); Argentina. Universidad Nacional de Córdoba; Argentin