374472 research outputs found
Sort by
Interacción de distintos soportes arcillosos con el conservante metil p-hidroxibenzoato
No full textComunicación oral presentada en XXXIX Reunión Científica de la Sociedad Española de Mineralogía: SEM 2022, Baeza (Jaén), del 28 de junio al 1 de Julio de 2022
Exploring nutritional quality and bioactive compounds in Mediterranean bean landraces
No full textThis study aimed to characterize the nutritional and nutraceutical properties of ten Mediterranean bean landraces compared to a commercial variety (Big Borlotto, Batlle Seeds). Significant genetic diversity was found among the landraces, affecting their nutritional composition, mineral content, and bioactive compounds. Essential minerals such as calcium, iron, and zinc exhibited considerable variability, with landraces 103, 15, 40, and 102 showing higher mineral levels than the control variety. The fatty acid profiles varied, with linolenic acid being predominant, accounting for 39.1–47.3 % of total fat, depending on the genotype. Positive correlations between fatty acids and mineral content suggest complex interdependencies influencing grain quality, with the strongest correlations observed between Mg and linolenic (r = 0.66) or palmitic (r = 0.63) acids. Beans with colored seed coats exhibited higher antioxidant capacity attributed to phenolic acids, flavonoids, carotenoids, and ascorbic acid, emphasizing seed coat color as an indicator of nutritional quality. Principal Component Analysis (PCA) identified five clusters based on physical and nutritional traits, revealing correlations between seed size, color, and quality. These findings highlight the potential of bean landraces to promote local economies and biodiversity.This work was supported by the project IVIA-GVA 52201D from Instituto Valenciano de Investigaciones Agrarias (this project is susceptible of being co-financed by the European Union through the FEDER Program 2021–2027 Comunitat Valenciana). Finally, MM was financed thanks to the award of the Spanish government MCIN/AEI to the IATA-CSIC as Center of Excellence Accreditation Severo Ochoa (CEX2021–001189-S/ MCIN/AEI / 10.13039/501100011033).With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2021-001189-S)Peer reviewe
High-cadence spectroscopy of M dwarfs - I. Analysis of systematic effects in HARPS-N line profile measurements on the bright binary GJ 725A+B
No full textUnderstanding the sources of instrumental systematic noise is a must to improve the design of future spectrographs. In this study, we alternated observations of the well-suited pair of M-stars GJ 725A+B to delve into the sub-night High Accuracy Radial Velocity Planet Searcher for the Northern hemisphere (HARPS-N) response. Besides the possible presence of a low-mass planet orbiting GJ 725B, our observations reveal changes in the spectral energy distribution (SED) correlated with measurements of the width of the instrumental line profile and, to a lower degree, with the Doppler measurements. To study the origin of these effects, we searched for correlations among several quantities defined and measured on the spectra and on the acquisition images. We find that the changes in apparent SED are very likely related to flux losses at the fibre input. Further tests indicate that such flux losses do not seriously affect the shape of the instrumental point spread function of HARPS-N, but identify an inefficient fitting of the continuum as the most likely source of the systematic variability observed in the full width at half-maximum. This index, accounting for the HARPS-N cross-correlation profiles width, is often used to decorrelate Doppler time series. We show that the Doppler measurement obtained by a parametric least-squares fitting of the spectrum accounting for continuum variability is insensitive to changes in the slope of the SED, suggesting that forward modelling techniques to measure moments of the line profile are the optimal way to achieve higher accuracy. Remaining residual variability at ~1 m s suggests that for M-stars Doppler surveys the current noise floor still has an instrumental origin. © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.The authors thank E. Sánchez Blanco, M. C. Cárdenas Vázquez, N. Piskunov, F. Pepe, C. Lovis, R. Cosentino, X. Dumusque, D. Staab and C. Haswell for constructive comments and discussions. They also acknowledge funding from AYA2011-30147-C03-01 by MINECO/Spain, FEDER funds/EU, and 2011-FQM-7363 of Junta de Andalucía/Spain (ZMB, PJA and CR-L); ZMB acknowledges support from the UGR/Spain and financial funding from FPI BES-2011-049647 of MINECO/Spain. This study is based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The authors thank the referee T. Böhm for his suggestions that helped improved this paper.Peer reviewe
Nanomineralogía de metales traza en piritas de depósitos VMS de la Faja Pirítica Ibérica
No full textComunicación oral presentada en XXXIX Reunión Científica de la Sociedad Española de Mineralogía: SEM 2022, Baeza (Jaén), del 28 de junio al 1 de Julio de 2022
Energyscapes pinpoint marine megafauna feeding hotspots in the Mediterranean
Get PDF12 pages, 5 figures, 3 tables, supporting information https://doi.org/10.1073/pnas.2412845122.-- Data, Materials, and Software Availability: R codes developed to conduct the present study are made available in the following Zenodo repository (136). The analyses presented in the manuscript build up from data and products previously published in various publications: (56–59)Ocean giants shape the structure and functioning of marine food webs via trophic top–down controls, landscapes of fear, vertical and horizontal redistribution of nutrients, energy, and matter. Yet, they face threats from overfishing, pollution, habitat degradation, and climate change, and one-third of marine megafauna species are at risk of extinction, ultimately endangering the resilience of entire ecosystems. In such a context, knowing when and where megafauna find resources to balance their substantial energy requirements is critical for their management. Through an energyscape approach integrating abundance censuses, diet, and energy requirements, we investigated the prey consumption patterns of Mediterranean marine megafauna during the summer. We thereby shed light on a diverse guild of species composed of fishes, mammals, reptiles, and birds and estimated that 4.1 million individuals consume 1.6 million tons of prey each summer, pelagic cephalopods being the primary food resource and cetaceans and tunas being key players in the community. Spatial patterns in prey consumption reflected the diverse distribution and needs of the megafauna species and underlined the critical importance of the western Mediterranean for the megafauna community. Conservation strategies should prioritize spatial and biological diversity to safeguard megafauna and ecosystem functions across the Mediterranean basinThis work was funded by the European Horizon 2020 Program EcoScope project under the grant agreement number 101000302With the institutional support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S)Peer reviewe
Infraestructura del grupo de biogeoquímica de Isótopos Estables (IACT, Granada): Aplicaciones en Arqueología
No full textComunicación oral presentada en INFRASTRUCTURE: Encuentros de reflexión estratégica, Madrid 25-27 de abril de 202
Interés de los isótopos ambientales en la investigación y control de las aguas minerales y mineromedicinales
No full textComunicación oral II Jornadas sobre Las Aguas Minerales y Termales, 8 y 9 de junio de 2022, Granad
Light-controlled assembly and disassembly of cyclodextrin-bisazobenzene supramolecular complexes
No full textThe inclusion complexation of a water soluble bis-azobenzene derivative (bis-Azo) and its monotopic analog (mono-Azo) with α-, β-, and γ-cyclodextrins (CyDs) was investigated as a prototype for light-responsive self-assembling systems. Using spectroscopic techniques (UV–vis, induced circular dichroism, 1H NMR), computational methods (molecular mechanics and dynamics), and thermodynamic analyses, we examined the photoswitching properties, stability, and structural dynamics of these systems. The azobenzene moieties in the E-isomer of mono-Azo and bis-Azo consistently showed strong affinity for the αCyD cavity, characterized by high association constants. In contrast, no complex formation was observed upon photoinduced E-to-Z isomerization. For bis-Azo, this implies the formation of supramolecular αCyD dimers, with the spatial separation between the oppositely oriented host components determined by the connector linking the two azobenzene moieties in the E-configured ditopic guest. This complex disassembles upon photoswitching, driven by the structural disruption associated with the Z-form. Both the E-and Z-isomers fitted in the cavity of βCyD, with moderate selectivity towards the E-form. A similar scenario was found for complexes with γCyD when using low concentrations of the host. Interestingly, at high concentrations γCyD formed low-solubility pseudopolyrotaxane-type supramolecular architectures with bis-Azo, which were disrupted upon Z-isomer photoisomerization. All the complexes demonstrated high fatigue resistance, maintaining structural integrity after multiple isomerization cycles. This work advances the design of stimuli-responsive preorganized supramolecular systems, with potential applications in nucleic acid delivery through dual pH/light-sensitive mechanisms.We acknowledge the Ministerio de Ciencia, Innovación y Universidades and the Agencia Estatal de Investigación, AEI/10.13039/501100011033, the ‘‘ERDF A way of making Europe’’ (PID2021-124247OB-C21, PID2021-124247OB-C22, PID2022-141034OB-C21, PID2020-118384GB-100 and CNS2022-135568) and the UAH (PIUAH23/CC-017). We also acknowledge funding by the European Union’s Horizon Europe research and innovation programme under the Marie Skłodowska-Curie grant agreement 101130235–Bicyclos and the PTI + Global Health (CSIC). The CITIUS (Univ. Seville) is additionally acknowledged for technical support. G.R.-B enjoyed a PhD fellowship (Grant number FPU18/02922). C. F.-C. is grateful for the FPU-UAH grant awarded (2023/00196).Peer reviewe
Black hole physics: More similar than knot
No full text© 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.Peer reviewe
A digital twin for geophysical extremes: interim results from the DT-GEO project
No full textA Digital Twin is a virtual lifecycle environment that contains a data-informed replica of a real system, model-
based prediction capabilities (scenarios) and, ideally, can provide feedback (decisions) to modify the real
system (i.e. to close the lifecycle loop