Compatibilidad de pinturas de protección temporaria ("shop primers”) con esquemas anticorrosivos para carenas

Las pinturas de protección temporaria se emplean en la industria naval para mantener el acero sin oxidación durante la etapa constructiva. Dicho fondo debe ser, además, compatible con los esquemas protectores a aplicar. Se han ensayado diferentes formulaciones de "shop-primers", exponiendo paneles a la intemperie durante un lapso de 20 meses. Productos a base de cinc y de cinc-aluminio son los que han mostrado mejores condiciones de resistencia, presentando buenas propiedades anticorrosivas. Sobre estos paneles pueden aplicarse esquemas para carena, los que cumplen con las exigencias establecidas para los ensayos en balsa.The shop-primers are employed in naval shipyards to protect the steel plates against corrosion during the construction period. These primers must be also compatible with the anticorrosion systems employed subsequently. Different formulations of shop-primers were tested by accelerated exposure tests during 20 months at La Plata. Products based on zinc dust and zinc-aluminium demonstrated good exterior resistance and anticorrosion properties. Over that panels anticorrosion marine paints were applied and submitted to raft trials in Mar del Plata’s Harbour

Innovaciones curriculares. Análisis del proceso de inclusión desde una perspectiva cinematográfica

En este trabajo hemos elegido la película “Intocable” como hilo conductor para exponer los elementos principales que han de darse en todo proceso de inclusión. Así, haremos un recorrido por la película destacando los momentos en los que aparecen los elementos “Presencia”, “Participación” y “Progreso” como indicadores del proceso de inclusión que se aprecia en esta bella obra cinematográfica

AER Neuro-Inspired interface to Anthropomorphic Robotic Hand

Address-Event-Representation (AER) is a communication protocol for transferring asynchronous events between VLSI chips, originally developed for neuro-inspired processing systems (for example, image processing). Such systems may consist of a complicated hierarchical structure with many chips that transmit data among them in real time, while performing some processing (for example, convolutions). The information transmitted is a sequence of spikes coded using high speed digital buses. These multi-layer and multi-chip AER systems perform actually not only image processing, but also audio processing, filtering, learning, locomotion, etc. This paper present an AER interface for controlling an anthropomorphic robotic hand with a neuro-inspired system.Unión Europea IST-2001-34124 (CAVIAR)Ministerio de Ciencia y Tecnología TIC-2003-08164-C03-02Ministerio de Ciencia y Tecnología TIC2000-0406-P4- 0

Derechos económicos, sociales y culturales, política pública y justiciabilidad

El presente documento, contiene la edición de la segunda parte de las discusiones sostenidas en el Foro sobre Derechos Económicos, Sociales y Culturales (DESC), auspiciado por la Comisión Económica para América Latina y el Caribe (CEPAL) y la Fundación Social, y que tuvo lugar en Bogota en noviembre de 2001. Los participantes en este foro, provienen de distintas disciplinas, son abogados, economistas, administradores públicos, sociólogos, historiadores, filósofos y periodistas. Se desempeñan en distintas actividades en el sector público, la academia, la rama judicial, ONG y organismos internacionales, y no todos comparten la misma aproximación teórica a los temas del derecho, la política o la economía. Esta relación de las discusiones reseña el debate acerca del alcance de la justiciabilidad de los derechos económicos, sociales y culturales y de las decisiones de política económica, que tienen impacto sobre dichos derechos. Los panelistas hicieron interesantes afirmaciones que ratifican diferentes visiones, a partir de las ópticas jurídica y económica, y dan lugar a sugestivas convergencias y divergencias.

Structural and functional studies of a family of Dictyostelium discoideum developmentally regulated, prestalk genes coding for small proteins

Includes additional file: Structure and chromosomal location of Dictyostelium genes similar to sigN1. In this table the DictyBase database accession number, chromosomal location and exon/intron structure of the genes similar to sigN1 is indicated together with the size of the encoded proteins and their percentage of similarity to SigN1.[Background] The social amoeba Dictyostelium discoideum executes a multicellular development program upon starvation. This morphogenetic process requires the differential regulation of a large number of genes and is coordinated by extracellular signals. The MADS-box transcription factor SrfA is required for several stages of development, including slug migration and spore terminal differentiation.[Results] Subtractive hybridization allowed the isolation of a gene, sigN (SrfA-induced gene N), that was dependent on the transcription factor SrfA for expression at the slug stage of development. Homology searches detected the existence of a large family of sigN-related genes in the Dictyostelium discoideum genome. The 13 most similar genes are grouped in two regions of chromosome 2 and have been named Group1 and Group2 sigN genes. The putative encoded proteins are 87–89 amino acids long. All these genes have a similar structure, composed of a first exon containing a 13 nucleotides long open reading frame and a second exon comprising the remaining of the putative coding region. The expression of these genes is induced at10 hours of development. Analyses of their promoter regions indicate that these genes are expressed in the prestalk region of developing structures. The addition of antibodies raised against SigN Group 2 proteins induced disintegration of multi-cellular structures at the mound stage of development.[Conclusion] A large family of genes coding for small proteins has been identified in D. discoideum. Two groups of very similar genes from this family have been shown to be specifically expressed in prestalk cells during development. Functional studies using antibodies raised against Group 2 SigN proteins indicate that these genes could play a role during multicellular development.This work was supported by grants from the Spanish Ministerio de Educación y Ciencia, Dirección General de Investigación (BMC2002-01501 and BFU2005-00138).Peer reviewe

Distribución, historia natural y conservación del Huroncito Patagónico Lyncodon patagonicus

The Patagonian Weasel Lyncodon patagonicus is a small mustelid that lives in the Southern Cone of South America (Argentina and Chile). The species is known from relatively few direct observations and collected specimens. In this paper we review available data about L. patagonicus to assess its conservation status. Information about its natural history is largely anecdotal, and suggests that it feeds on fossorial rodents. Known record localities are based on specimens observed or collected during the nineteenth and twentieth centuries. Its distribution encompasses herbaceous and shrub steppes and xerophytic woodlands, and presumably includes protected areas. However, the presence of L. patagonicus in these areas must be reconfirmed, because most records of occurrence are more than 10 years old. The perceived scarcity of this species in the wild could be real, but its relatively widespread distribution might protect it from the effects of environmental alteration and other human impacts. We conclude that field studies are urgently needed to confirm the current distribution and ecological requirements of the Patagonian Weasel.Fil: Prevosti, Francisco Juan. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; ArgentinaFil: Teta, Pablo Vicente. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; ArgentinaFil: Pardiñas, Ulises Francisco J.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentin

A connection between power series and Dirichlet series

[EN] We prove that for any convergent Laurent series f(z) = ∞n=−k anzn with k ≥ 0, there is a meromorphic function F(s) on C whose only possible poles are among the integers n = 1, 2, ..., k, having residues Res(F; n) = a−n/(n − 1)!, and satisfying F(−n) = (−1)nn! an for n = 0, 1, 2, .... Under certain conditions, F(s) is a Mellin transform. In particular, this happens when f(z) is of the form H(e−z)e−z with H(z) analytic on the open unit disk. In this case, if H(z) = ∞ n=0 hnzn, the analytic continuation of H(z) to z = 1 is related to the analytic continuation of the Dirichlet series ∞n=1 hn−1n−s to the complex plane