228 resultados para Ignacio Zuloaga


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[ES] Hace un siglo Altamira y La Mouthe suscitaron el primer discurso de autentificación de la gráfica rupestre de apariencia paleolítica. Se repasan varios casos recientes de peritaje del arte rupestre occidental que recurren a conjeturas, datos y argumentos varios para validar grabados y pinturas «descontextualizados» (al margen de depósitos estratificados y que no pueden ser datados directamente). En estos años 90 nuevas perspectivas de datación y análisis intentan precisar (¿renovar?) los argumentos de autentificación.

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Papillomaviruses (PVs) are widespread pathogens. However, the extent of PV infections in bats remains largely unknown. This work represents the first comprehensive study of PVs in Iberian bats. We identified four novel PVs in the mucosa of free-ranging Eptesicus serotinus (EserPV1, EserPV2, and EserPV3) and Rhinolophus ferrumequinum (RferPV1) individuals and analyzed their phylogenetic relationships within the viral family. We further assessed their prevalence in different populations of E. serotinus and its close relative E. isabellinus. Although it is frequent to read that PVs co-evolve with their host, that PVs are highly species-specific, and that PVs do not usually recombine, our results suggest otherwise. First, strict virus-host co-evolution is rejected by the existence of five, distantly related bat PV lineages and by the lack of congruence between bats and bat PVs phylogenies. Second, the ability of EserPV2 and EserPV3 to infect two different bat species (E. serotinus and E. isabellinus) argues against strict host specificity. Finally, the description of a second noncoding region in the RferPV1 genome reinforces the view of an increased susceptibility to recombination in the E2-L2 genomic region. These findings prompt the question of whether the prevailing paradigms regarding PVs evolution should be reconsidered.

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[EUS] Lan honetan aurkikuntza baten berri ematen dugu: Plentziako armarri batean aurkitutako hiru euskal esaera zahar (1603) aurkezten eta hizkuntzaren eta historiaren ikuspuntutik aztertzen ditugu. Hiru esaerotatik bi «Refranes y sentencias» 1596) lanean agertzen dira, eta hori datu garrantzitsua da; izan ere, Lakarrak 1996) errefrau-bilduma anonimo horren jatorriaz egindako proposamena berresteko argudio berria da. Zehazki, Bizkaiko ipar-mendebala proposatu zuen Lakarrak bildumako errefrauen jatorri gisa. Beste alde batetik, Bizkaiko ipar-mendebaleko euskararen zenbait ezaugarri baliatuta, Arrasateko erreketari buruzko zenbait kantu eremu horretan sortu zirela proposatzen dugu —zehazki, Butroeko (Gatika) dorretxearen inguruan—, hizkuntzari dagozkion argudioak historiari buruzkoekin osatuta.

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[ES] Como proyecto de fin de carrera se ha elaborado el manual de identidad corporativa de la empresa Sunlight Consultores S.L. Es un trabajo práctico funcional, desarrollado para un cliente real.

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Lymphangioleiomyomatosis (LAM) is a rare lung-metastasizing neoplasm caused by the proliferation of smooth muscle-like cells that commonly carry loss-of-function mutations in either the tuberous sclerosis complex 1 or 2 (TSC1 or TSC2) genes. While allosteric inhibition of the mechanistic target of rapamycin (mTOR) has shown substantial clinical benefit, complementary therapies are required to improve response and/or to treat specific patients. However, there is a lack of LAM biomarkers that could potentially be used to monitor the disease and to develop other targeted therapies. We hypothesized that the mediators of cancer metastasis to lung, particularly in breast cancer, also play a relevant role in LAM. Analyses across independent breast cancer datasets revealed associations between low TSC1/2 expression, altered mTOR complex 1 (mTORC1) pathway signaling, and metastasis to lung. Subsequently, immunohistochemical analyses of 23 LAM lesions revealed positivity in all cases for the lung metastasis mediators fascin 1 (FSCN1) and inhibitor of DNA binding 1 (ID1). Moreover, assessment of breast cancer stem or luminal progenitor cell biomarkers showed positivity in most LAM tissue for the aldehyde dehydrogenase 1 (ALDH1), integrin-beta 3 (ITGB3/CD61), and/or the sex-determining region Y-box 9 (SOX9) proteins. The immunohistochemical analyses also provided evidence of heterogeneity between and within LAM cases. The analysis of Tsc2-deficient cells revealed relative over-expression of FSCN1 and ID1; however, Tsc2-deficient cells did not show higher sensitivity to ID1-based cancer inhibitors. Collectively, the results of this study reveal novel LAM biomarkers linked to breast cancer metastasis to lung and to cell stemness, which in turn might guide the assessment of additional or complementary therapeutic opportunities for LAM.

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Egungo Europa 50 estatu inguruk osatzen dute eta bertan 700 milioitik gora pertsonak hitz egiten dituzten 200 hizkuntza baino gehiago daude. Geografikoki eremu nahiko mugatua eta txikia izan arren, oso anitza ere badela esan dezakegu. Hizkuntza alorrean dagoen aniztasun horren gainean Europan egin den kudeaketa azaltzen ahaleginduko naiz lan honen bitartez, horretarako Europan azken hamarkadetan aintzatetsitako hizkuntza eskubideak, horien eraentza eta horien baitan emandako jurisprudentzia azalduz.

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Evidence of interpersonal violence has been documented previously in Pleistocene members of the genus Homo, but only very rarely has this been posited as the possible manner of death. Here we report the earliest evidence of lethal interpersonal violence in the hominin fossil record. Cranium 17 recovered from the Sima de los Huesos Middle Pleistocene site shows two clear perimortem depression fractures on the frontal bone, interpreted as being produced by two episodes of localized blunt force trauma. The type of injuries, their location, the strong similarity of the fractures in shape and size, and the different orientations and implied trajectories of the two fractures suggest they were produced with the same object in face-to-face interpersonal conflict. Given that either of the two traumatic events was likely lethal, the presence of multiple blows implies an intention to kill. This finding shows that the lethal interpersonal violence is an ancient human behavior and has important implications for the accumulation of bodies at the site, supporting an anthropic origin.

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[ES] Se llevan a cabo tres experimentos para estudiar el efecto de tres factores el metabolismo de Carassius auratus: temperatura de exposición, ración de alimento diario y tiempo transcurrido tras la exposición a las nuevas condiciones.

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[ES] Estudio del vulcanismo submarino de edad Cretácico en la transversal de Errigoiti. Implicaciones petrogenéticas y geodinámicas derivadas del estudio de los diques, mediante láminas delgadas, "visu" de las rocas de campo y análisis geoquímicos con sus respectivos diagramas e interpretaciones.

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Plant growth at extremely high elevations is constrained by high daily thermal amplitude, strong solar radiation and water scarcity. These conditions are particularly harsh in the tropics, where the highest elevation treelines occur. In this environment, the maintenance of a positive carbon balance involves protecting the photosynthetic apparatus and taking advantage of any climatically favourable periods. To characterize photoprotective mechanisms at such high elevations, and particularly to address the question of whether these mechanisms are the same as those previously described in woody plants along extratropical treelines, we have studied photosynthetic responses in Polylepis tarapacana Philippi in the central Andes (18 degrees S) along an elevational gradient from 4300 to 4900 m. For comparative purposes, this gradient has been complemented with a lower elevation site (3700 m) where another Polylepis species (P. rugulosa Bitter) occurs. During the daily cycle, two periods of photosynthetic activity were observed: one during the morning when, despite low temperatures, assimilation was high; and the second starting at noon when the stomata closed because of a rise in the vapour pressure deficit and thermal dissipation is prevalent over photosynthesis. From dawn to noon there was a decrease in the content of antenna pigments (chlorophyll b and neoxanthin), together with an increase in the content of xanthophyll cycle carotenoids. These results could be caused by a reduction in the antenna size along with an increase in photoprotection. Additionally, photoprotection was enhanced by a partial overnight retention of de-epoxized xanthophylls. The unique combination of all of these mechanisms made possible the efficient use of the favourable conditions during the morning while still providing enough protection for the rest of the day. This strategy differs completely from that of extratropical mountain trees, which uncouple light-harvesting and energy-use during long periods of unfavourable, winter conditions.