Diseño de un aparato experimental para la medida de la deformación de una barra a flexión y verificación la lectura extensiometríca

Questo progetto intende calcolare la deformazione di una trave di acciaio a mensola di cui disponiamo in laboratorio. La trave è attaccata al tavolo di lavoro, insieme al dispositivo che eserciterà diverse forze puntuali sull’estremo libero della trave, forze esercitate in modo verticale e verso il basso. Lo scopo principale di questo tipo di studi, relativi alla deformazione di materiali, è che, grazie a detta deformazione, insieme agli sforzi ai quali la provetta è sottomessa, possiamo stabilire le proprietà meccaniche del materiale o il comportamento di un elemento strutturale. La determinazione sperimentale delle tensioni prodotte su un pezzo servizio si realizza in due fasi consecutive: 1/ misura delle deformazioni dovute alle tensioni sulla superficie dell’elemento 2/ calcolo delle tensioni partendo dalle deformazioni misurate. Attualmente il metodo più utilizzato per calcolare le deformazioni prodotte dalle tensioni sulla superficie si chiama l’estensometria. Con questo progetto creeremo un apparecchio di supporto per l’utilizzo di “comparatori” allo scopo di calcolare la deformata, a partire dagli spostamenti verticali ai quali è sottoposta la sbarra. In tale caso saremo in grado di quantificare e ridurre – nella misura del possibile- gli errori occorsi in seguito all’utilizzo dell’estensometria, facendo posteriormente il paragone dei dati ottenuti dai due metodi. ___________________________________________________________________________________________________________________________El proyecto que nos ocupa trata de calcular la deformación de una viga de acero en voladizo, de la cual; disponemos en el laboratorio de la universidad, anclada el banco de pruebas. El banco dispone de la sujeción de la viga, así como del dispositivo para ejercer distintas fuerzas puntúelas en el extremo libre de la misma, con dirección vertical y hacia abajo. Este dispositivo se puede ver en la figura 1, de la memoria El objetivo principal del éste tipo de estudios, referentes a la deformación de materiales, es que junto a ésta y a los esfuerzos a los que se encuentra sometida la probeta, podemos determinar los propiedades mecánicas del material o el comportamiento de una pieza que forma parte de una estructura. La determinación experimental de las tensiones producidas en una pieza en servicio se realiza en dos pasos consecutivos: 1/ medida de las deformaciones creadas por las tensiones en la superficie del elemento, 2/cálculo de las tensiones a partir de las deformaciones medidas. Actualmente el método más utilizado para el cálculo de las deformaciones producidas por las tensiones en la superficie es la extensometría. Con este proyecto diseñaremos un aparato soporte para el uso de “relojes comparadores” con el fin de calcular la deformada, a partir de los desplazamientos verticales que sufre la barra; y así cuantificar y reducir en la medida de lo posible los errores producidos con el uso de la extensometría, comparando posteriormente los datos obtenidos según ambos métodos.Ingeniería Técnica en Mecánic

The Study of Growth and Performance in Local Chicken Breeds and Varieties: A Review of Methods and Scientific Transference

A review of the scientific advances in the study of the growth and performance in native chicken breeds and varieties over the past 20 years was performed. Understanding the growth patterns of native breeds can only be achieved if the constraints characterizing these populations are considered and treated accordingly. Contextually, the determination of researchers to use the same research methods and study designs applied in international commercial poultry populations conditions the accuracy of the model, variability capturing ability, and the observational or predictive performance when the data of the local population are fitted. Highly skewed sex ratios favouring females, an inappropriate census imbalance compensation and a lack of population structure render models that are regularly deemed effective as invalid to issue solid and sound conclusions. The wider the breed diversity is in a country, the higher the scientific attention paid to these populations. A detailed discussion of the most appropriate models and underlying reasons for their suitability and the reasons preventing the use of others in these populations is provided. Furthermore, the factors conditioning the scientific reception and impact of related publications used to transfer these results to the broad scientific public were evaluated to serve as guidance for the maximization of the success and dissemination of local breed information

Aplicación del formato hipertextual a textos legales: el ejemplo del código del Mercosur

Texto de la comunicación incluida en el Congreso Internacional de Información - INFO 99, del 2 al 6 de octubre de 1999, en La Habana (Cuba), organizado por el IDICT (Instituto de Información Científica y Tecnológica). La comunicación fue presentada, pero no se incluyó en las actas por un error en la edición de las mismas.Descripción del proyecto que realizaron la editorial Ciudad Argentina (Buenos Aires, Argentina) y el Departamento de Biblioteconomía y Documentación de la Universidad Carlos III de Madrid (España) para la conversión del Código del Mercosur a un formato electrónico e hipertextual. El proyecto permitió llevar a la práctica las similitudes conceptuales entre la interrelación de textos legales y el enlace de los mismos mediante hipertextos. La aplicación se desglosó en una serie de tareas consecutivas (análisis documental del texto, organización electrónica del mismo, establecimiento de hiperenlaces entre textos seleccionados), partiendo de una concepción que pretendía unos resultados legibles (en cualquier plataforma, con aplicaciones gratuitas, mediante un lenguaje extendido y fácil de usar), así como los resultados finales. En su realización, se constató la necesidad de emplear equipos interdisciplinares (expertos documentales en derecho y técnicos en documentación automatizada), atender a la utilidad final del producto, emplear tecnologías más sencillas pero más potentes, y facilitar la accesibilidad al mayor número posible de usuarios

Characterisation of biological growth curves of different varieties of an endangered native hen breed kept under free range conditions

The aim of this study is to model the growth samples of four varieties (White, Black, Partridge, Franciscan) of Spanish Utrerana hen breed, which is endangered, by using Brody, Von Bertalanffy, Verhulst, Logistic and Gompertz models. For this purpose, a total of 16,235 weight data observations from 2004 animals reared in free range system were collected. Logistic was the best suited model for predicting the biological growth curve of White variety in both sexes, while Von Bertalanffy was the best fitting model for the rest of individuals of the breed, based on the 5 goodness-of-fit and flexibility criteria: Pseudo-R2 , mean squared error, Akaike information criterion, Bayesian information criterion and the biological coherence of the estimated parameters. Black variety was the heaviest, with values of 2605.96 and 2032.61 g (for males and females, respectively) for a parameter, while White variety presented the lowest maturity weight (a ¼ 2442.99 and 1874.24 g, for males and females, respectively). Conclusively, this growth characterisation is essential for the conservation of the Utrerana hen, to search for new market niches and a greater profitability to this differentiated product.info:eu-repo/semantics/publishedVersio

New 3-Dimensional Volumetric Ultrasound Method for Accurate Quantification of Atherosclerotic Plaque Volume.

Carotid and femoral plaque burden is a recognized biomarker of cardiovascular disease risk. A new electronic-sweep 3-dimensional (3D)-matrix transducer method can improve the functionality and image quality of vascular ultrasound atherosclerosis imaging. This study aimed to validate this method for plaque volume measurement in early and intermediate-advanced plaques in the carotid and femoral territories. Plaque volumes were measured ex vivo in pig carotid and femoral artery specimens by 3-dimensional vascular ultrasound (3DVUS) using a 3D-matrix (electronic-sweep) transducer and its associated 3D plaque quantification software, and were compared with gold-standard histology. To test the clinical feasibility and accuracy of the 3D-matrix transducer, an experiment was conducted in intermediate-high risk individuals with carotid and femoral atherosclerosis. The results were compared with those obtained using the previously validated mechanical-sweep 3D transducer and established 2-dimensional (2D)-based plaque quantification software. In the ex vivo study, the authors assessed 19 atherosclerotic plaques (plaque volume, 0.76 µL-56.30 μL), finding strong agreement between measurements with the 3D-matrix transducer and the histological gold-standard (intraclass correlation coefficient [ICC]: 0.992; [95% CI: 0.978-0.997]). In the clinical analysis of 20 patients (mean age 74.6 ± 4.45 years; 40% men), the authors found 64 (36 carotid and 28 femoral) of 80 scanned territories with atherosclerosis (measured atherosclerotic volume, 10 μL-859 μL). There was strong agreement between measurements made from electronic-sweep and mechanical-sweep 3DVUS transducers (ICC: 0.997 [95% CI: 0.995-0.998]). Agreement was also high between plaque volumes estimated by the 2D and 3D plaque quantification software applications (ICC: 0.999 [95% CI: 0.998-0.999]). Analysis time was significantly shorter with the 3D plaque quantification software than with the 2D multislice approach with a mean time reduction of 46%. 3DVUS using new matrix transducer technology, together with improved 3D plaque quantification software, simplifies the accurate volume measurement of early (small) and intermediate-advanced plaques located in carotid and femoral arteries.This study was partially funded by grants from the Ministerio de Economia, Industria y Competividad (MEIC) with cofunding from the European Regional Development Fund (ERDF) (SAF2016-75580-R to Dr Bentzon) and (BES-2016-076633 to Dr Nogales). Research funding was also received from the Instituto de Salud Carlos III Spain (PIE16/ 00021 to Drs Bueno and Fuster). The CNIC is supported by the Min- isterio de Ciencia, Innovacion y Universidades (MICINN) and the Pro CNIC Foundation and is a Severo Ochoa Center of Excellence (CEX2020-001041-S). This study forms part of a Master Research Agreement between the CNIC and Philips Healthcare. Drs Sánchez- González, Entrekin, and Collet-Billon are employees of Philips Healthcare. All other authors have reported that they have no re- lationships to disclose related to the contents of this paper.S

The Antioxidant Properties of Salvia verbenaca Extract Contribute to Its Intestinal Antiinflammatory Effects in Experimental Colitis in Rats

La enfermedad inflamatoria intestinal (EII) es una inflamación gastrointestinal crónica con fluctuaciones de síntomas impredecibles. Si bien no existe una cura eficaz para la EII, varios tratamientos tienen como objetivo controlar los síntomas y mejorar la calidad de vida de las personas afectadas. En los últimos años, ha habido un interés creciente en los beneficios potenciales de ciertas plantas y hierbas naturales en el tratamiento de la EII. En este sentido, este estudio tuvo como objetivo evaluar los efectos inmunomoduladores y antiinflamatorios de un extracto bien caracterizado de Salvia verbenaca (S. verbenaca) en un modelo experimental de colitis en ratas. Curiosamente, la administración diaria de S. verbenaca (10 y 25 mg/kg) alivió eficazmente los síntomas de la colitis, como lo demuestra la reducción de la relación peso/longitud y el daño colónico. Además, redujo los marcadores de estrés oxidativo (MPO y GSH), disminuyó la expresión de citocinas proinflamatorias (Il-6, Il-12a, Il-1β, Il-23, Icam-1, Mcp-1, Cinc-1) y conservó la integridad de la barrera intestinal (Villin, Muc-2, Muc-3). Estos efectos sugieren que el extracto de S. verbenaca podría representar un potencial candidato complementario para tratar los trastornos gastrointestinales. Sus acciones beneficiosas pueden estar relacionadas con sus propiedades antioxidantes, así como con la regulación negativa de la respuesta inmune, lo que puede resultar en la mejora de la barrera epitelial del intestino.Inflammatory bowel disease (IBD) is a chronic gastrointestinal inflammation with unpredictable symptom fluctuations. While there is no effective cure for IBD, various treatments aim to manage symptoms and improve the quality of life for affected individuals. In recent years, there has been growing interest in the potential benefits of certain natural plants and herbs in the management of IBD. In this regard, this study aimed to evaluate the immunomodulatory and anti-inflammatory effects of a well-characterized extract of Salvia verbenaca (S. verbenaca) in an experimental model of colitis in rats. Interestingly, the daily administration of S. verbenaca (10 and 25 mg/kg) effectively alleviated colitis symptoms, as evidenced by reduced weight/length ratio and colonic damage. Moreover, it reduced oxidative stress markers (MPO and GSH), decreased pro-inflammatory cytokine expression (Il-6, Il-12a, Il-1β, Il-23, Icam-1, Mcp-1, Cinc-1), and preserved the integrity of the intestinal barrier (Villin, Muc-2, Muc-3). These effects suggest S. verbenaca extract could represent a potential complementary candidate to treat gastrointestinal disorders. Its beneficial actions can be related to its antioxidant properties as well as the downregulation of the immune response, which can result in the improvement in the intestine epithelial barrier.Junta de Andalucia (AGR-6826)Junta de Andalucia (CTS-164)Ministerio de Economía y Competitividad (SAF2011-29648)Instituto de Salud Carlos III (pFIS (FI20/00159)Instituo de Saud Carlos III (Miguel Servet CP22/00153

Major bleeding predictors in patients with left atrial appendage closure: The iberian registry II

Introduction and objective: Major bleeding events in patients undergoing left atrial appendage closure (LAAC) range from 2.2 to 10.3 per 100 patient-years in di erent series. This study aimed to clarify the bleeding predictive factors that could influence these di erences. Methods: LAAC was performed in 598 patients from the Iberian Registry II (1093 patient-years; median, 75.4 years). We conducted a multivariate analysis to identify predictive risk factors for major bleeding events. The occurrence of thromboembolic and bleeding events was compared to rates expected from CHA2DS2-VASc (congestive heart failure, hypertension, age, diabetes, stroke history, vascular disease, sex) and HAS-BLED (hypertension, abnormal renal and liver function, stroke, bleeding, labile INR, elderly, drugs or alcohol) scores. Results: Cox regression analysis revealed that age 75 years (HR: 2.5; 95% CI: 1.3 to 4.8; p = 0.004) and a history of gastrointestinal bleeding (GIB) (HR: 2.1; 95% CI: 1.1 to 3.9; p = 0.020) were two factors independently associated with major bleeding during follow-up. Patients aged <75 or 75 years had median CHA2DS2-VASc scores of 4 (IQR: 2) and 5 (IQR: 2), respectively (p < 0.001) and HAS-BLED scores were 3 (IQR: 1) and 3 (IQR: 1) for each group (p = 0.007). Events presented as follow-up adjusted rates according to age groups were stroke (1.2% vs. 2.9%; HR: 2.4, p = 0.12) and major bleeding (3.7 vs. 9.0 per 100 patient-years; HR: 2.4, p = 0.002). Expected major bleedings according to HAS-BLED scores were 6.2% vs. 6.6%, respectively. In patients with GIB history, major bleeding events were 6.1% patient-years (HAS-BLED score was 3.8 1.1) compared to 2.7% patients-year in patients with no previous GIB history (HAS-BLED score was 3.4 1.2; p = 0.029). Conclusions: In this high-risk population, GIB history and age 75 years are the main predictors of major bleeding events after LAAC, especially during the first year. Age seems to have a greater influence on major bleeding events than on thromboembolic risk in these patient

Beneficial Effects of Limosilactobacillus fermentum in the DCA Experimental Model of Irritable Bowel Syndrome in Rats

Limosilactobacillus fermentum CECT5716, a probiotic strain isolated from human milk, has reported beneficial effects on different gastrointestinal disorders. Moreover, it has shown its ability to restore altered immune responses, in association with microbiome modulation in different pathological conditions. Therefore, our aim was to assess the effects of a Limosilacbacillus fermentum CECT5716 in a rat experimental model of irritable bowel syndrome (IBS) that resembles human IBS. The experimental IBS was induced by deoxycholic acid (DCA) in rats and then, Limosilactobacillus fermentum CECT5716 (109 CFU/day/rat) was administered. Behavioral studies, hyperalgesia and intestinal hypersensitivity determinations were performed and the impact of the probiotic on the inflammatory and intestinal barrier integrity was evaluated. Additionally, the gut microbiota composition was analyzed. Limosilactobacillus fermentum CECT5716 attenuated the anxiety-like behavior as well as the visceral hypersensitivity and referred pain. Moreover, this probiotic ameliorated the gut inflammatory status, re-establishing the altered intestinal permeability, reducing the mast cell degranulation and re-establishing the gut dysbiosis in experimental IBS. Therefore, our results suggest a potential use of Limosilactobacillus fermentum CECT5716 in clinical practice for the management of IBS patients.Junta de Andalucia A-CTS-447-UGR18 CTS 164Instituto de Salud Carlos IIIEuropean Commission PI19/01058 PI20/0144

The Prebiotic Effects of an Extract with Antioxidant Properties from Morus alba L. Contribute to Ameliorate High-Fat Diet-Induced Obesity in Mice

Obesity is a global health issue, in which modifications in gut microbiota composition have a key role. Different therapeutic strategies are being developed in combination with diet and exercise, including the use of plant extracts, such as those obtained from Morus alba L. leaves. Recent studies have revealed their anti-inflammatory and antioxidant properties. The aim of the present work was to evaluate whether the beneficial effects of M. alba L. leaf extract in high-fat diet-induced obesity in mice is correlated with its impact on gut microbiota. The extract reduced body weight gain and attenuated lipid accumulation, as well as increased glucose sensitivity. These effects were associated with an amelioration of the obesity-associated inflammatory status, most probably due to the described antioxidant properties of the extract. Moreover, M. alba L. leaf extract mitigated gut dysbiosis, which was evidenced by the restoration of the Firmicutes/Bacteroidota ratio and the decrease in plasma lipopolysaccharide (LPS) levels. Specifically, the extract administration reduced Alistipes and increased Faecalibaculum abundance, these effects being correlated with the beneficial effects exerted by the extract on the obesity-associated inflammation. In conclusion, anti-obesogenic effects of M. alba L. leaf extract may be mediated through the amelioration of gut dysbiosis.Junta de Andalucia CTS 164Instituto de Salud Carlos III PI19.01058Spanish Government AGL2015-67995-C3-3-Rperational Programme of the Region of Murcia (CCI) 2007ES161PO001 14-20/20European CommissionInstituto de Salud Carlos IIIi-pFIS, Instituto de Salud Carlos III; Programa de Doctorado BiomedicinapFIS, Instituto de Salud Carlos III; Programa de Doctorado Nutricio

In-doped gallium oxide micro- and nanostructures: morphology, structure, and luminescence properties

The influence of indium doping on morphology, structural, and luminescence properties of gallium oxide micro- and nanostructures is reported. Indium-doped gallium oxide micro- and nanostructures have been grown by thermal oxidation of metallic gallium in the presence of indium oxide. The dominant morphologies are beltlike structures, which in many cases are twisted leading to springlike structures, showing that In diffusion in Ga2O3 influences the microstructure shapes. High-resolution transmission electron microscopy has revealed the presence of twins in the belts, and energy-dispersive X-ray spectroscopy in the scanning electron microscopy (SEM) has detected a segregation of indium impurities at the edges of planar structures. These results suggest that indium plays a major role in the observed morphologies and support the assumption of a layer by layer model as growth mechanism. An additional assessment of indium influence on the defect structure has been performed by cathodoluminescence in the SEM, X-ray photoelectron microscopy, and spatially resolved Raman spectroscopy