272 research outputs found

    Mal de Pott en Álava

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    X Congreso Nacional de Paleopatología. Univesidad Autónoma de Madrid, septiembre de 200

    Patología en varios peregrinos procedentes de Santiago de Compostela

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    X Congreso Nacional de Paleopatología. Univesidad Autónoma de Madrid, septiembre de 200

    Arenas de dragado marino como nueva fuente para materiales de construcción

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    This work deals with the use of dredged marine sand (DMS) in pastes and mortars as construction material. Different materials from two Spanish ports were used: DMS-0 from Sant Carles de la Ràpita and DMS-A, DMS-B and DMS-C from Barcelona. The aim of the study was to assess DMS as addition (its influence on cohesion and fluidity) or as a fine granular corrector (its influence on compressive strength) in different mixes of cement paste and mortars, respectively. Two experimental stages were carried out: firstly, DMS-0 material was used on the production of pastes and mortars (partial substitution of raw sand 0/2 mm); secondly, DMS-A, DMS-B and DMS-C were used on mortar production (partial substitution of raw sand 0/5 mm). The fresh and hardened properties obtained were compared to those of the control mixes; the results revealed 25 % as an optimum substitution ratio of raw sands for DMS.Este trabajo propone el uso de arenas de dragado marino (DMS) en pastas y morteros como material constructivo. Se utilizaron materiales de dos puertos españoles: DMS-0 del puerto de Sant Carles de la Ràpita, y DMS-A, DMS-B y DMS-C del puerto de Barcelona. El objetivo del estudio era evaluar el material DMS como adición (influencia sobre cohesión y fluidez) o como corrector granular (influencia sobre resistencia a la compresión) en diferentes mezclas de pasta y morteros de cemento, respectivamente. Se realizaron dos fases experimentales: primero, se empleó el DMS-0 en la producción de pastas y morteros (sustitución parcial de arena natural 0/2 mm); a continuación, se emplearon DMS-A, DMS-B y DMS-C en la producción de morteros (sustitución parcial de arena natural 0/5 mm). Los resultados obtenidos fueron comparados con las mezclas de control y revelaron que la proporción óptima de sustitución de arenas naturales por DMS era del 25 %

    Polyurethane/acrylic hybrid dispersions containing phosphorus reactive flame retardants as transparent coatings for wood

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    Phosphorus modified polyurethane/acrylic hybrid dispersions were prepared for flame retardant transparent wood coatings. The polymerisation was carried out in three steps. In the first one, the polyurethane was synthesised using an acrylic monomer as solvent. The second step involved water addition that promoted the phase inversion and lastly, acrylic part was polymerised. The phosphorous compounds were covalently linked to polyurethane using a phosphorylated polyol and to the acrylic phase using an acrylic phosphate. Polymerisation was monitored by FTIR and NMR and the molar mass of the hybrids was measured by AF4 and SEC. The effects of the phosphorus in fire-retardant properties were analysed by thermogravimetry and pyrolysis combustion flow calorimetry. The introduction of phosphorus did not produce significant changes in the polymerisation process but promoted the cross-linking of the coatings. The coated wood samples maintained the transparency and good properties with the introduction of phosphorus and presented a slight reduction in the Peak Heat Release Rate measured by cone calorimeter. The action of phosphorus as a fire retardant was effective as it gave rise to significant reduction of the CO and CO2 peaks.The funding received from University of the Basque Country (GIU19/077, predoctoral grant of M. Puyadena and postdoctoral grant of M. Cobos) and the Basque Government (IT1313-19, PIBA20/16) is grate-fully acknowledged. Technical and human support provided by SGIker is also sincerely acknowledged (UPV/EHU/ ERDF, EU

    Near-Earth asteroids spectroscopic survey at Isaac Newton Telescope

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    The population of near-Earth asteroids (NEAs) shows a large variety of objects in terms of physical and dynamical properties. They are subject to planetary encounters and to strong solar wind and radiation effects. Their study is also motivated by practical reasons regarding space exploration and long-term probability of impact with the Earth. We aim to spectrally characterize a significant sample of NEAs with sizes in the range of \sim0.25 - 5.5 km (categorized as large), and search for connections between their spectral types and the orbital parameters. Optical spectra of NEAs were obtained using the Isaac Newton Telescope (INT) equipped with the IDS spectrograph. These observations are analyzed using taxonomic classification and by comparison with laboratory spectra of meteorites. A total number of 76 NEAs were observed. We classified 44 of them as Q/S-complex, 16 as B/C-complex, eight as V-types, and another eight belong to the remaining taxonomic classes. Our sample contains 27 asteroids categorized as potentially hazardous and 31 possible targets for space missions including (459872) 2014 EK24, (436724) 2011 UW158, and (67367) 2000 LY27. The spectral data corresponding to (276049) 2002 CE26 and (385186) 1994 AW1 shows the 0.7 μ\mum feature which indicates the presence of hydrated minerals on their surface. We report that Q-types have the lowest perihelia (a median value and absolute deviation of 0.797±0.2440.797\pm0.244 AU) and are systematically larger than the S-type asteroids observed in our sample. We explain these observational evidences by thermal fatigue fragmentation as the main process for the rejuvenation of NEA surfaces. In general terms, the taxonomic distribution of our sample is similar to the previous studies and matches the broad groups of the inner main belt asteroids. Nevertheless, we found a wide diversity of spectra compared to the standard taxonomic types.Comment: Accepted in Astronomy & Astrophysics (A&A

    Correlation between serum advanced glycation end products and dietary intake of advanced glycation end products estimated from home cooking and food frequency questionnaires

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    Abstract Background & aims: To our knowledge the association between dietary advanced glycation end-products (dAGEs) and cardiometabolic disease is limited. Our aim was to examine the association between dAGEs and serum concentration of carboxymethyl-lysine (CML) or soluble receptor advanced glycation end-products (sRAGEs), and to assess the difference on dAGEs and circulating AGEs according to lifestyle and biochemical measures. Methods and results: 52 overweight or obese adults diagnosed with type 2 diabetes were included in this cross-sectional analysis. dAGEs were estimated from a Food Frequency Questionnaire (FFQ) or from a FFQ þ Home Cooking Frequency Questionnaire (HCFQ). Serum concentrations of CML and sRAGEs were measured by ELISA. Correlation tests were used to analyze the association between dAGEs derived from the FFQ or FFQ þ HCFQ and concentrations of CML or sRAGEs. Demographic characteristics, lifestyle factors and biochemical measures were analyzed according to sRAGEs and dAGEs using student t-test and ANCOVA. A significant inverse association was found between serum sRAGEs and dAGEs estimated using the FFQ þ HCFQ (r Z 0.36, p Z 0.010), whereas no association was found for dAGEs derived from the FFQ alone. No association was observed between CML and dAGEs. dAGEs intake estimated from the FFQ þ HCFQ was significantly higher among younger and male participants, and in those with higher BMI, higher Hb1Ac levels, longer time with type 2 diabetes, lower adherence to Mediterranean diet, and higher use of culinary techniques that generate more AGEs (all p values p < 0.05). Conclusions: These results show knowledge on culinary techniques is relevant to derive the association between dAGEs intake and cardiometabolic risk factors

    Towards an improvement in the spectral description of central stars of planetary nebulae

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    Context. There are more than 3000 known Galactic planetary nebulae, but only 492 central stars of Galactic planetary nebulae (CSPN) have known spectral types. It is vital to increase this number in order to have reliable statistics, which will lead to an increase of our understanding of these amazing objects. Aims. We aim to contribute to the knowledge of central stars of planetary nebulae and stellar evolution. Methods. This observational study is based on Gemini Multi-Object Spectrographs (GMOS) and with the Intermediate Dispersion Spectrograph (IDS) at the Isaac Newton Telescope spectra of 78 CSPN. The objects were selected because they did not have any previous classification, or the present classification is ambiguous. These new high quality spectra allowed us to identify the key stellar lines for determining spectral classification in the Morgan-Keenan (MK) system. Results. We have acquired optical spectra of a large sample of CSPN. From the observed targets, 50 are classified here for the first time while for 28 the existing classifications have been improved. In seven objects we have identified a P-Cygni profile at the He I lines. Six of these CSPN are late O-Type. The vast majority of the stars in the sample exhibit an absorption-Type spectrum, and in one case we have found wide emission lines typical of [WR] stars. We give a complementary, and preliminary, classification criterion to obtain the sub-Type of the O(H)-Type CSPN. Finally, we give a more realistic value of the proportion of CSPN that are rich or poor in hydrogen.Instituto de Astrofísica de La Plat

    Idoneidad de la prescripción antibiótica en atención primaria en la Comunidad Autónoma Vasca

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    ObjetivoEstudiar la variabilidad e idoneidad de la prescripción antibiótica en atención primaria en la Comunidad Autónoma Vasca (CAV).DiseñoEstudio descriptivo, prospectivo.EmplazamientoCentros de atención primaria de la red reformada y no reformada de la CAV.Mediciones y resultados principalesSe estudiaron 3.182 infecciones obtenidas de consultas sobre enfermedad infecciosa mediante muestreo estratificado por área sanitaria durante febrero, marzo y abril de 1998. La idoneidad de la prescripción de antibióticos (ATB) se comparó con unos patrones elaborados tras una extensa revisión bibliográfica. Un 68,6% de las consultas son infecciones que no requieren ATB (catarro de vías altas [IRA], bronquitis aguda, gripe y gastroenteritis). Se utilizan ATB en un 28,5% de estos casos (IC, 26,6-30,5). Destaca la bronquitis aguda, con un 90,7% (IC, 87,3-93,4). La prescripción innecesaria supone un 39,7% de la prescripción total antibiótica (IC, 37,2-42,1%), suponiendo un gasto anual innecesario de 1.155 millones de pesetas.En el 31,4% de las infecciones que requieren tratamiento con ATB, se opta por uno no adecuado en un 23,7% (IC, 21-26,7%).En total, la idoneidad del tratamiento global fue del 72,2% (IC, 70,6-73,8). El hecho de trabajar en la red reformada se asoció a una mejor prescripción en todos los casos. Los pediatras prescriben mejor en el caso de las infecciones no susceptibles de tratamiento con ATB.ConclusionesLa prescripción de ATB no se realiza conforme a la evidencia científica disponible. Los tratamientos incorrectos tienen lugar sobre todo en procesos benignos y autolimitados. Es necesaria una política local de uso de ATB que incluya colaboración multidisciplinaria y formación continuada efectiva.ObjectiveTo study the variability and suitability of antibiotic prescription in primary care in the Basque Country.DesignProspective, descriptive study.SettingBasque Country health care centres both within and not in the reformed network.Measurements and main results3182 infections from consultations for infectious disease were studied through sampling stratified by health area during February, March and April 1998. The appropriateness of antibiotics (ATB) prescription was compared with some standards after an extensive bibliographic review. 68.6% of consultations were infections not needing ATB (infections of respiratory airways, acute bronchitis, flu and gastro-enteritis). ATB were used in 28.5% of these cases (CI: 26.6-30.5), especially in acute bronchitis (90.7%) (CI: 87.3-93.4). Unnecessary prescription supposes 39.7% of total antibiotic prescription (CI: 37.2-42.1%), which means unnecessary annual expenditure of 1155 million pesetas. In 31.4% of the infections that require ATB treatment, in 23.7% inappropriate treatment was chosen (CI: 21-26.7%). Overall appropriateness of treatment was 72.2% (CI: 70.6-73.8). Working in the reformed system was linked to better prescription in all cases. Paediatricians prescribed better in the case of infections not susceptible to ATB treatment.ConclusionsATB prescription is not consistent with the available scientific evidence. Incorrect treatments occur especially in benign and self-limiting processes. A local policy of ATB use that includes multi-disciplinary collaboration and effective ongoing training is necessary

    San Adrian: un nuevo yacimiento de la Edad del Bronce en el Norte de la Peninsula Iberica

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    Bronze Age studies carried out in the Cantabrian Region have traditionally focused on prestige goods and funerary contexts. As a result of this, the lack of information about daily activities, subsistence strategies, and human settlement on a regional scale is evident in the state of art. However, current research has achieved new discoveries in recent years, allowing a reconstruction of some aspects of the economic structure, settlements, material culture and the palaeoenvironment during the Bronze Age. Indeed, besides the funerary practices discovered in 1983 in San Adrian (Parztuergo Nagusia, Gipuzkoa), research has now revealed the presence of Upper Palaeolithic and Early Bronze Age occupations. This paper presents a first characterization of the retrieved evidence and a preliminary evaluation of the archaeological site and its environment. San Adrian is a tunnel-shaped cave located at 1,000 meters a.s.l. in the Aizkorri mountain range, opening a passage beneath the Atlantic-Mediterranean watershed in northern Iberia. The strategic character of this mountain site is demonstrated by the presence of Upper Palaeolithic and Bronze Age occupations, and by the construction of a road passing through it and the fortification of both its entrances in the Middle Ages. The aim of the archaeological survey started in 2008 was to identify, describe and evaluate the heritage potential of the cave, because previous fieldwork had only managed to make surface finds in the side galleries, including a medieval hoard and Bronze Age human remains. The work carried out by our research group at San Adrian includes a series of test pits and the excavation of an area nine square metres in size following stratigraphic criteria. In the current state, we identified at least two contexts corresponding to Late Upper Palaeolithic and Bronze Age occupations in the cave. Fieldwork included the sieving and flotation of sediment and the collection of samples for different types of analysis: palynology, carpology, sedimentology, and radiocarbon dating. The evidence is being studied by a multidisciplinary team according to expertise requirements for each topic: palaeobotany and environment, archaeozoology, sedimentology, geology, physical anthropology, prehistoric industries (lithics, pottery and bone) and archaeological and historical documentation. Because of its recent discovery, Upper Palaeolithic evidence remains still under study, but first results on Bronze Age layers can be presented. The ongoing archaeobotanical and archaeozoological studies reveal the exploitation of domestic plants and fauna complemented by hunting and foraging of wild species. At the same time, the archaeological artefacts and their production sequences show the exploitation of nearby resources on both sides of the mountain range, while prestige goods are absent. This evidence is also used to estimate the regularity of cave occupations and to propose a model of seasonal exploitation of the mountain environment. The results obtained reveal the exploitation of resources from both the Mediterranean and Atlantic basins, and contribute towards an understanding of the daily activities of Bronze Age societies. In addition, the evidence shows the exchange and circulation of quotidian products between the Cantabrian region and inland Iberia in other networks than those of prestige goods

    280 one-opposition near-Earth asteroids recovered by the EURONEAR with the <i>Isaac Newton</i> Telescope

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    Context. One-opposition near-Earth asteroids (NEAs) are growing in number, and they must be recovered to prevent loss and mismatch risk, and to improve their orbits, as they are likely to be too faint for detection in shallow surveys at future apparitions. Aims. We aimed to recover more than half of the one-opposition NEAs recommended for observations by the Minor Planet Center (MPC) using the Isaac Newton Telescope (INT) in soft-override mode and some fractions of available D-nights. During about 130 h in total between 2013 and 2016, we targeted 368 NEAs, among which 56 potentially hazardous asteroids (PHAs), observing 437 INT Wide Field Camera (WFC) fields and recovering 280 NEAs (76% of all targets). Methods. Engaging a core team of about ten students and amateurs, we used the THELI, Astrometrica, and the Find_Orb software to identify all moving objects using the blink and track-and-stack method for the faintest targets and plotting the positional uncertainty ellipse from NEODyS. Results. Most targets and recovered objects had apparent magnitudes centered around V ~ 22.8 mag, with some becoming as faint as V ~ 24 mag. One hundred and three objects (representing 28% of all targets) were recovered by EURONEAR alone by Aug. 2017. Orbital arcs were prolonged typically from a few weeks to a few years; our oldest recoveries reach 16 years. The O−C residuals for our 1854 NEA astrometric positions show that most measurements cluster closely around the origin. In addition to the recovered NEAs, 22 000 positions of about 3500 known minor planets and another 10 000 observations of about 1500 unknown objects (mostly main-belt objects) were promptly reported to the MPC by our team. Four new NEAs were discovered serendipitously in the analyzed fields and were promptly secured with the INT and other telescopes, while two more NEAs were lost due to extremely fast motion and lack of rapid follow-up time. They increase the counting to nine NEAs discovered by the EURONEAR in 2014 and 2015. Conclusions. Targeted projects to recover one-opposition NEAs are efficient in override access, especially using at least two-meter class and preferably larger field telescopes located in good sites, which appear even more efficient than the existing surveys
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