Synthesis of periglacial processes in Galicia (Spain)

[Resumen] En esta comunicación, de carácter bibliográfico, los autores incluyen con un breve comentario las publicaciones que hacen referencia a fenómenos periglaciares en Galicia[Abstract] In this note, of bibliographical characteristic, the authors enclose with a brief commentary about the periglacial geomorphology publications in the country of the Galicia

Synthesis of geomorphological processes in the «Galaico-Astur» Bounds

[Resumen] En este trabajo se analizan los distintos procesos geomorfológicos que han intervenido en el modelado de formas en el sector Galaico-Astur. Actualmente, los procesos de índole dinámica (fluviales, marinos, etc.) y los edafogenéticos son los que muestran una mayor incidencia aunque condicionados por la influencia de factores estructurales y de orden climático; buena parte de su eficacia está favorecida, igualmente, por las acciones antrópicas. En lo que respecta a los procesos antiguos, éstos vuelven a revestir su mayor importancia dentro de la tipología dinámica; no obstante, ellos presentan una originalidad más contrastada al haber actuado bajo condiciones climáticas más rigurosas y extremas, y con niveles de base marinos muy diferentes.[Abstract] In this synthesis we analyse the several geomorphological processes that have contributed to model the landforms in the «Galaico-Astur» area. At present, the dynamic nature processes (fluvial, marine, etc.) show a greater incidence though they are conditioned by the inf1uén:~ of climatic and structural factors; most of their efficacy results also increased by antrhopactions. As regards the ancient processes, those of dynamic type are again the more important ones. Furthermore, they appear more stressed because their action was performed on different sea-marine levels and their effects were reinforced by extreme and severe climatic conditions

Estudio geomorfológico de las terrazas fluviales cuaternarias del Valle del Tajo (sector Aranjuez-Toledo)

[Resumen] En esta comunicación se analiza la morfología de los distintos niveles de terraza que pertenecientes al sistema fluvial Tajo-Jarama existen en el tramo comprendido entre Aranjuez y Toledo; igualmente se estudian las características sedimentológicas de los aluviones asociados a estas terrazas, así como otras formaciones detríticas de diferentes épocas geológicas que se advierten en esta zona de la Submeseta Sur. De esta manera se continuan las observaciones realizadas por nosotros hace unos años en las terrazas del Tajo, aguas arriba de Aranjuez y hasta las inmediaciones del embalse de Almoguera, en la provincia de Guadalajara (GONZALEZ MARTIN y ASENSIO AMOR, 1979), así como las investigaciones dedicadas a las deformaciones pseudo-tectónicas que en ocasiones afectan a los conjuntos sedimentarios fluviales (GONZALEZ MARTIN y ASENSIO AMOR, 1980)[Resumé] On étude dans ce travail les caracteres géomorphologiques des différents niveaux de terrasses dans la vallée du Tajo-Jarama (Aranjuez-Toledo). En meme temps, on analyse les caractéristiques sédimentologiques des materiaux associés aux ces formes morphologiques et des autres formations détritiques des ages tertiaires et quaternaires. De cette façon nous poursuivons les observations faites, il y a quelque temps, pour nous meme. D'un cote, le systeme de terrasses dans l'amont de Aranjuez et jusqu'a les environs de Almoguera (GONZALEZ MARTIN y ASENSIO AMOR, 1979). De l'autre, les recherches consacrées aux déformations pseudo-tectoniques visibles quelques fois dans ces ensambles sédimentaires quaternaires (GONZALEZ MARTIN y ASENSIO AMOR, 1980)

Hierarchy and Competition in CSCW applications: Model and case study

CSCW applications need to adapt themselves to the functional and organizational structures of people that use them. However they do not usually support division in groups with a certain hierarchical structure among them. In this paper, we propose and study a theoretical model of groupware appliations that reflects those hierarchical interactions. The proposed model is also intended to evaluate the effects in performance derived from competitive and collaborative relationships among the components of a hierarchy of groups. In order to demonstrate the above ideas, a groupware game, called Alymod, was designed and implemented using a modified version of a well-known CSCW Toolkit, namely Groupkit. Groupkit was modified in order to support group interactions in the same CSCW application. In Alymod, participants compete or collaborate within a hierarchical structure to achieve a common goal (completing gaps in a text, finishing numerical series, resolving University course examinations, etc.).Publicad

Bayesian Inversion of Stokes Profiles

[abridged] Inversion techniques are the most powerful methods to obtain information about the thermodynamical and magnetic properties of solar and stellar atmospheres. In the last years, we have witnessed the development of highly sophisticated inversion codes that are now widely applied to spectro-polarimetric observations. The majority of these inversion codes are based on the optimization of a complicated non-linear merit function. However, no reliable and statistically well-defined confidence intervals can be obtained for the parameters inferred from the inversions. A correct estimation of the confidence intervals for all the parameters that describe the model is mandatory. Additionally, it is fundamental to apply efficient techniques to assess the ability of models to reproduce the observations and to what extent the models have to be refined or can be simplified. Bayesian techniques are applied to analyze the performance of the model to fit a given observed Stokes vector. The posterior distribution, is efficiently sampled using a Markov Chain Monte Carlo method. For simplicity, we focus on the Milne-Eddington approximate solution of the radiative transfer equation and we only take into account the generation of polarization through the Zeeman effect. However, the method is extremely general and other more complex forward models can be applied. We illustrate the ability of the method with the aid of academic and realistic examples. We show that the information provided by the posterior distribution turns out to be fundamental to understand and determine the amount of information available in the Stokes profiles in these particular cases.Comment: 15 pages, 12 figures, accepted for publication in A&

Triaxial stellar systems following the r1/n luminosity law: an analytical mass-density expression, gravitational torques and the bulge/disc interplay

We have investigated the structural and dynamical properties of triaxial stellar systems whose surface brightness profiles follow the r1/n luminosity law - extending the analysis by Ciotti, who explored the properties of spherical r1/n systems. A new analytical expression that accurately reproduces the spatial (i.e., deprojected) luminosity density profiles (error less than 0.1 per cent) is presented for detailed modelling of the Sérsic family of luminosity profiles. We evaluate both the symmetric and the non-axisymmetric components of the gravitational potential and force, and compute the torques as a function of position. For a given triaxiality, stellar systems with smaller values of n have a greater non-axisymmetric gravitational field component. We also explore the strength of the non-axisymmetric forces produced by bulges with differing n and triaxiality on systems having a range of bulge-to-disc ratios. The increasing disc-to-bulge ratio with increasing galaxy type (decreasing n) is found to greatly reduce the amplitude of the non-axisymmetric terms, and therefore reduce the possibility that triaxial bulges in late-type systems may be the mechanism or perturbation for non-symmetric structures in the disc. Using seeing-convolved r1/n-bulge plus exponential-disc fits to the K-band data from a sample of 80 nearby disc galaxies, we probe the relations between galaxy type, Sérsic index n and the bulge-to-disc luminosity ratio. These relations are shown to be primarily a consequence of the relation between n and the total bulge luminosity. In the K band, the trend of decreasing bulge-to-disc luminosity ratio along the spiral Hubble sequence is predominantly, though not entirely, a consequence of the change in the total bulge luminosity; the trend between the total disc luminosity and Hubble type is much weake

Chemical composition and antioxidant activity of phenolic extracts from peanut skins obtained by different industrial process

Peanut skins present phenolic compounds with antioxidant properties which are excellent as a source of natural antioxidants. In food products, the antioxidants have the function ofneutralizedthe action of free radicals produced by oxidation reactions. The objective of this study was to determine the chemical composition and antioxidant activity of extracts rich in phenolic compounds form peanut skins obtained by two industrial process.Fil: Larrauri, Mariana. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Larrauri, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Asensio, Claudia M. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Asensio, Claudia M. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Martín, María Paula. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Martín, María Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Zunino, M. Paula. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Ciencia y Tecnología de los Alimentos; Argentina.Fil: Zunino, M. Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Zygadlo, Julio A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Ciencia y Tecnología de los Alimentos; Argentina.Fil: Zygadlo, Julio A. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Grosso, Nelson R. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Grosso, Nelson R. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Fil: Nepote, Valeria. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Ciencia y Tecnología de los Alimentos; Argentina.Fil: Nepote, Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentina.Otras Ciencias Agrícola

The PhoP-Dependent ncRNA Mcr7 Modulates the TAT Secretion System in Mycobacterium tuberculosis

The PhoPR two-component system is essential for virulence in Mycobacterium tuberculosis where it controls expression of approximately 2% of the genes, including those for the ESX-1 secretion apparatus, a major virulence determinant. Mutations in phoP lead to compromised production of pathogen-specific cell wall components and attenuation both ex vivo and in vivo. Using antibodies against the native protein in ChIP-seq experiments (chromatin immunoprecipitation followed by high-throughput sequencing) we demonstrated that PhoP binds to at least 35 loci on the M. tuberculosis genome. The PhoP regulon comprises several transcriptional regulators as well as genes for polyketide synthases and PE/PPE proteins. Integration of ChIP-seq results with high-resolution transcriptomic analysis (RNA-seq) revealed that PhoP controls 30 genes directly, whilst regulatory cascades are responsible for signal amplification and downstream effects through proteins like EspR, which controls Esx1 function, via regulation of the espACD operon. The most prominent site of PhoP regulation was located in the intergenic region between rv2395 and PE_PGRS41, where the mcr7 gene codes for a small non-coding RNA (ncRNA). Northern blot experiments confirmed the absence of Mcr7 in an M. tuberculosis phoP mutant as well as low-level expression of the ncRNA in M. tuberculosis complex members other than M. tuberculosis. By means of genetic and proteomic analyses we demonstrated that Mcr7 modulates translation of the tatC mRNA thereby impacting the activity of the Twin Arginine Translocation (Tat) protein secretion apparatus. As a result, secretion of the immunodominant Ag85 complex and the beta-lactamase BlaC is affected, among others. Mcr7, the first ncRNA of M. tuberculosis whose function has been established, therefore represents a missing link between the PhoPR two-component system and the downstream functions necessary for successful infection of the host

Unidades litológicas del Neógeno en el extremo oeste de la Cuenca del Guadalquivir y su correlación con el sondeo Huelva-1 (Huelva - España)

A detailed surveying and a new geological map of the sheet at 1:50.000 number 999/1016 (Huelva - Los Caños), located at the west end of the Guadalquivir Basin, has been carried out. This data allows us to propose a new organization of the lithological units present at the west side of the Odiel River. These units include all the sedimentary record in this sector of the Guadalquivir Basin, ranging from Tortonian to Pliocene, but with shallower and coarser facies that are only present in this part of the basin. This fact is due to the location of the area, probably less subsiding due to a longer distance from Betic-Rif orogen. The lithological units are described concisely and a correlation with the core of the Huelva-1 borehole and with the outcrops of Huelva – Palos de la Frontera area is also proposed. The units are organized in a stack of sequences with a progradational pattern, typical of a basin margin, and highlighting a gradual reduction of the accommodation space in the late Messinian and during the Pliocene.Se ha realizado un reconocimiento detallado y un nuevo mapa geológico de la hoja a 1: 50.000 número 999/1016 (Huelva - Los Caños), situada en el extremo oeste de la Cuenca del Guadalquivir. Estos datos nos han permitido proponer una nueva organización de las unidades litológicas presentes en el lado oeste del río Odiel. Estas unidades incluyen el registro sedimentario completo de este sector de la Cuenca del Guadalquivir, que va desde Tortoniense al Plioceno, pero mostrando unas facies más someras y gruesas que solo están presentes en esta parte de la cuenca. Este hecho se debe a la ubicación de la zona, probablemente menos subsidente debido a su mayor distancia con respecto al orógeno Bético-Rifeño. Las unidades litológicas se describen de forma concisa y se propone también su correlación con el testigo del sondeo Huelva-1 y los afloramientos de la zona de Huelva - Palos de la Frontera. Las unidades litológicas se organizan formando un apilamiento de secuencias con un patrón progradacional, típico de un borde de cuenca, y ponen de manifiesto una reducción gradual del espacio de acomodación a finales del Messiniense y durante el Plioceno.Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEMinisterio de Economía y Competitividad (MINECO)Plan de Edición de Cartografía Geológica y Geomorfológica del IGME 2013-2016pu