Some Properties of Affine C -semigroups

Numerical semigroups have been extensively studied throughout the literature, and many of their invariants have been characterized. In this work, we generalize some of the most important results about symmetry, pseudo-symmetry, or fundamental gaps, to affine C -semigroups. In addition, we give algorithms to compute the tree of irreducible C -semigroups and C -semigroups with a given Frobenius vector.19 página

Stellar population gradients in Fornax Cluster S0 galaxies: connecting bulge and disk evolution

We present absorption-line index gradients for a sample of S0 galaxies in the Fornax Cluster. The sample has been selected to span a wide range in galaxy mass, and the deep VLT-FORS2 spectroscopy allows us to explore the stellar populations all the way to the outer disk-dominated regions of these galaxies. We find that globally, in both bulges and disks, star formation ceased earliest in the most massive systems, as a further manifestation of downsizing. However, within many galaxies, we find an age gradient which indicates that star formation ended first in the outermost regions. Metallicity gradients, when detected, are always negative such that the galaxy centres are more metal-rich. This finding fits with a picture in which star formation continued in the central regions, with enriched material, after it had stopped in the outskirts. Age and metallicity gradients are correlated, suggesting that large differences in star formation history between the inner and outer parts of S0 galaxies yield large differences in their chemical enrichment. In agreement with previous results, we conclude that the radial variations in the stellar populations of S0 galaxies are compatible with the hypothesis that these galaxies are the descendants of spiral galaxies whose star formation has ceased. With the addition of radial gradient information, we are able to show that this shutdown of star formation occurred from the outside inward, with the later star formation in the central regions offering a plausible mechanism for enhancing the bulge light in these systems, as the transformation to more bulge-dominated S0 galaxies requires.Comment: 9 pages, 4 figures and Appendix, accepted for publication in MNRA

Análisis de islas de calor por medio de imágenes satelitales y sistemas de información geográficos en el área urbana de la Sabana de Bogotá

In this investigation all data related to Land surface temperature (LST) collected from  satellite Landsat 8 was compared to temperature data collected from surface stations located in Sabana de Bogotá, to identify urban heat islands. It was developed a crop in the study area of satellite image in order to processing spectrum bands 10, 4 and 5, using a Land surface Temperature algorithm to collect the satellite mapping of the surface temperature. At the same time, this data was analyzed as statistically as spatially considering the distance and elevation of the stations interpolating them with Cokriging’s method and the ArcGIS 10.3® Software, detecting spatially the geometry of the islands in high urbanization zones, getting the Pixel temperature and comparing it to surface station data finding differences between temperature in urban zones commonly with more vegetation and the two methods used for this study.En esta investigación, los datos relacionados con la temperatura superficial (LST) recopilados del satélite Landsat 8 se compararon con los datos de temperatura seleccionados de las estaciones de superficie, ubicadas en la sabana de Bogotá, para identificar islas de calor urbanas. Se recortó el área de estudio de la imagen satelital para procesar las bandas del espectro 10, 4 y 5, usando un algoritmo de temperatura superficial para recolectar el mapeo satelital. Al mismo tiempo, estos datos se analizaron estadísticamente como espacialmente considerando la distancia y la elevación de las estaciones interpolando con el método de Cokriging y el software ArcGIS 10.3®, detectando espacialmente la geometría de las islas en zonas de alta urbanización, obteniendo la temperatura de píxeles y comparándolo con los datos de la estación de superficie, encontrando diferencias entre la temperatura en zonas urbanas comúnmente con más vegetación y los dos métodos utilizados para este estudio

Interoperabilidad entre organismos nacionales, provinciales y municipales

El objetivo del trabajo es establecer en que medida se cumple la interoperabilidad entre organismos nacionales, provinciales o municipales en el marco de una solución de Gobierno Electrónico (GE). Para el estudio definiremos la interoperabilidad más allá de la técnica, la tecnología disponible en relación a los estándares y los niveles jurisdiccionales del Estado. A pesar de que se han implementado, en diversos organismos de gobierno, sistemas de servicios al ciudadano; éstos no están formalizados ni alcanzan un nivel de integración adecuado a las necesidades de información que el GE plantea entre los distintos gestores de gobierno. Por lo cual hace esencial un proceso formal de implementación de GE más una adecuación a la tecnología disponible, llámese servidores únicos de datos, redes distribuidas y la plena cooperación y colaboración entre organismos jurisdiccionales oficiales. Finalmente se plantea la necesidad de contar con un fuerte liderazgo político, para asegurar el éxito de una implementación de soluciones de GE en el marco de la interoperabilidad entre distintos organismos y niveles jurisdiccionales. Es decir entre reparticiones pertenecientes a entidades gubernamentales del ámbito nacional, provincial y/o municipal.Sociedad Argentina de Informática e Investigación Operativ

Covalent Immobilization of Antibodies through Tetrazine-TCO Reaction to Improve Sensitivity of ELISA Technique

This research was funded by Compra Publica Precomercial, Reference 2012/000069, Ministerio de Economia y Competitividad, Espana. ONCOVER project: Volatile compound detection system for early cancer diagnosis.Enzyme-linked immunosorbent assay (ELISA) is routinely used to detect biomolecules related to several diseases facilitating diagnosis and monitoring of these, as well as the possibility of decreasing their mortality rate. Several methods have been carried out to improve the ELISA sensitivity through antibodies immobilization on the microtiter plates. Here, we have developed a strategy of antibodies immobilization to improve the ELISA sensitivity increasing the antibody density surface through the tetrazine (Tz)-trans-cyclooctene (TCO) reaction. For this, we prepared surfaces with tetrazine groups while the captured antibody was conjugated with TCO. The tetrazine surfaces were prepared in two different ways: (1) from aminated plates and (2) from Tz-BSA-coated plates. The surfaces were evaluated using two sandwich ELISA models, one of them using the low-affinity antibody anti-c-myc as a capture antibody to detect the c-myc-GST-IL8h recombinant protein, and the other one to detect the carcinoembryonic human protein (CEA). The sensitivity increased in both surfaces treated with tetrazine in comparison with the standard unmodified surface. The c-myc-GST-IL8h detection was around 10-fold more sensible on both tetrazine surfaces, while CEA ELISA detection increased 12-fold on surfaces coated with Tz-BSA. In conclusion, we show that it is possible to improve the ELISA sensitivity using this immobilization system, where capture antibodies bond covalently to surfaces.Compra Publica Precomercial, Ministerio de Economia y Competitividad, Espana 2012/00006

The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?

The Cerro Munro sub-volcanic intrusion is emplaced in the back-arc (400 km from the trench) as small sub-circular tonalite-granodiorite plutons with abundant radial porphyritic dikes. U-Pb zircon SHRIMP data give an age of crystallization of 57 Ma ± 1.4 Ma. It is located to the east of the North Patagonian Batholith (NPB) that shows a protracted and episodic magmatic history from Cretaceous to Miocene time. The NPB Palaeogene episode is characterized by the lack of magmatic activity at the arc axis, as small plutonic emplacements move to the fore-arc and back-arc. This Palaeogene tectono-magmatic episode is ruled by the detachment of the Aluk plate during the Aluk-Farallon-SAM triple junction, active at that time along northern Patagonia active margin, changing the Cretaceous ?NPB orogenic? setting to a Palaeogene ?Munro transitional? tectono-magmatic setting. Near the contacts, the tonalite contains abundant enclaves of igneous appearance and variable size from several cm to dm, described as autoliths. The study of autoliths and host tonalite reveals interesting results on the processes of fractionation in a thermally zoned magma chamber. Autoliths, and in a large extent the host tonalite, represent disguised cumulates from which a hydrous silicic liquid was extracted. Barometry calculations from mineral chemistry in both autoliths and tonalites record a shallow pressure of emplacement of 0.5 kbar. Rhyolite-dacite flows and ignimbrites, surrounding the northern contact of the Cerro Munro tonalite, may represent the exsolved liquid from the plutonic cumulates. The study by cathodoluminiscence and electron backscattered diffraction techniques from a rhyolite-hosted quartz supports this protracted history of the Cerro Munro magma chamber.Facultad de Ciencias Naturales y MuseoCentro de Investigaciones GeológicasConsejo Nacional de Investigaciones Científicas y Técnica

The Palaeocene Cerro Munro tonalite intrusion (Chubut Province, Argentina): A plutonic remnant of explosive volcanism?

The Cerro Munro sub-volcanic intrusion is emplaced in the back-arc (400 km from the trench) as small sub-circular tonalite-granodiorite plutons with abundant radial porphyritic dikes. U-Pb zircon SHRIMP data give an age of crystallization of 57 Ma ± 1.4 Ma. It is located to the east of the North Patagonian Batholith (NPB) that shows a protracted and episodic magmatic history from Cretaceous to Miocene time. The NPB Palaeogene episode is characterized by the lack of magmatic activity at the arc axis, as small plutonic emplacements move to the fore-arc and back-arc. This Palaeogene tectono-magmatic episode is ruled by the detachment of the Aluk plate during the Aluk-Farallon-SAM triple junction, active at that time along northern Patagonia active margin, changing the Cretaceous ?NPB orogenic? setting to a Palaeogene ?Munro transitional? tectono-magmatic setting. Near the contacts, the tonalite contains abundant enclaves of igneous appearance and variable size from several cm to dm, described as autoliths. The study of autoliths and host tonalite reveals interesting results on the processes of fractionation in a thermally zoned magma chamber. Autoliths, and in a large extent the host tonalite, represent disguised cumulates from which a hydrous silicic liquid was extracted. Barometry calculations from mineral chemistry in both autoliths and tonalites record a shallow pressure of emplacement of 0.5 kbar. Rhyolite-dacite flows and ignimbrites, surrounding the northern contact of the Cerro Munro tonalite, may represent the exsolved liquid from the plutonic cumulates. The study by cathodoluminiscence and electron backscattered diffraction techniques from a rhyolite-hosted quartz supports this protracted history of the Cerro Munro magma chamber.Facultad de Ciencias Naturales y MuseoCentro de Investigaciones GeológicasConsejo Nacional de Investigaciones Científicas y Técnica

Optically-passive spirals: The missing link in gradual star formation suppression upon cluster infall

Galaxies migrate from the blue cloud to the red sequence when their star formation is quenched. Here, we report on galaxies quenched by environmental effects and not by mergers or strong AGN as often invoked: They form stars at a reduced rate which is optically even less conspicuous, and manifest a transition population of blue spirals evolving into S0 galaxies. These 'optically passive' or 'red spirals' are found in large numbers in the STAGES project (and by Galaxy Zoo) in the infall region of clusters and groups.Comment: Proceedings of "The Starburst-AGN connection" conference held in Shanghai, Oct 27-31, 200