Search results for "CLU"
showing 10 items of 14395 documents
Macroalgal responses to ocean acidification depend on nutrient and light levels
2015
Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and will likely vary regionally, depending on factors such as irradiance (light vs. shade) and nutrient levels (oligotrophic vs. eutrophic). Thus experiments are needed to evaluate interactive effects of combined stressors in the field. In this study, we investigated the physiological responses of macroalgae near a CO2 seep in oligotrophic waters off Vulcano (Italy). The algae were incubated in situ …
Elemental and isotope covariation of noble gases in mineral phases from Etnean volcanics erupted during 2001–2005, and genetic relation with peripher…
2008
Abstract During 2001–2005, Mount Etna was characterized by intense eruptive activity involving the emission of petrologically different products from several vents, which involved at least two types of magma with different degrees of evolution. We investigated the ratios and abundances for noble-gas isotopes in fluid inclusions trapped in olivines and pyroxenes in the erupted products. We confirm that olivine has the most efficient crystalline structure for preserving the pristine composition of entrapped gases, while pyroxene can suffer diffusive He loss. Both the minerals also experience noble gas air contamination after eruption. Helium isotopes of the products genetically linked to the …
Ligand mediated evolution of size dependent magnetism in cobalt nanoclusters.
2018
We use density functional theory to model the impact of a ligand shell on the magnetic properties of CoN (15 ≤ N ≤ 55) nanoclusters. We study three different ligand shells on each nanocluster core size, each known to have different electronic interactions with the surface: pure Cl ligand shells (X-type), pure PH3 ligand shells (L-type), and two component ligand shells with mixtures of Cl and PH3 ligands. The simulations show that the identity, arrangement, and total coverage of the ligand shell controls the distribution of local magnetic moments across the CoN core. On the surface of an unpassivated CoN nanocluster, the Co-Co coordination number (CN) is known to determine the local magnetic…
Experimental and Computational Study of Unique Tetranuclear µ3-Chloride and µ-Phenoxo/Chloro-Bridged Defective Dicubane Cobalt(II) Clusters
2016
Two tetranuclear CoII clusters [Co4(L)2(µ3-Cl)2Cl2] have been prepared by using multidentate diaminobisphenolate ligands. The solid-state structures of the complexes were determined by single-crystal X-ray diffraction. The cores of the cluster compounds can be defined as a two-vertex-deficient dicubane geometry (pseudo-dicubane). In the central unit, the cobalt(II) cations are linked through phenoxide oxygen (outer bridges) and chloride anions (inner bridges), previously unprecedented in this type of cobalt cluster. The magnetic properties were studied by both experimental and computational methods. By using a combination of techniques, we were able to determine the nature and strength of t…
Toolbox for Distance Estimation and Cluster Validation on Data With Missing Values
2022
Missing data are unavoidable in the real-world application of unsupervised machine learning, and their nonoptimal processing may decrease the quality of data-driven models. Imputation is a common remedy for missing values, but directly estimating expected distances have also emerged. Because treatment of missing values is rarely considered in clustering related tasks and distance metrics have a central role both in clustering and cluster validation, we developed a new toolbox that provides a wide range of algorithms for data preprocessing, distance estimation, clustering, and cluster validation in the presence of missing values. All these are core elements in any comprehensive cluster analy…
High Lipid Content of Prey Fish and n−3 PUFA Peroxidation Impair the Thiamine Status of Feeding-Migrating Atlantic Salmon (Salmo salar) and Is Reflec…
2022
Signs of impaired thiamine (vitamin B1) status in feeding-migrating Atlantic salmon (Salmo salar) were studied in three Baltic Sea areas, which differ in the proportion and nutritional composition of prey fish sprat (Sprattus sprattus) and herring (Clupea harengus). The concentration of n−3 polyunsaturated fatty acids (n−3 PUFAs) increased in salmon with dietary lipids and n−3 PUFAs, and the hepatic peroxidation product malondialdehyde (MDA) concentration increased exponentially with increasing n−3 PUFA and docosahexaenoic acid (DHA, 22:6n−3) concentration, whereas hepatic total thiamine concentration, a sensitive indicator of thiamine status, decreased with th…
Las percepciones de la exclusión social en el medio rural durante la Gran Recesión: una historia de marcos neoliberales, patriarcales e idilio rural
2022
En este artículo se exploran las percepciones de alcaldes rurales sobre los procesos de exclusión social en sus territorios y los marcos ideológicos que las sostienen. La evidencia empírica de nuestro estudio, contextualizado en España durante la crisis de 2008-2014, procede de entrevistas cualitativas en dos proyectos de investigación sobre exclusión social en áreas rurales de Castilla-La Mancha y la Comunidad Valenciana. Nuestro análisis muestra diferencias significativas entre las descripciones objetivas de exclusión social en el medio rural y cómo se perciben. Los alcaldes responsabilizan de esos procesos a la crisis económica y a las decisiones personales, mientras obvian cualquier res…
Introduzione
2022
Il volume raccoglie alcuni contributi scaturiti da attività di ricerca e didattica di due laboratori dei Corsi di studio in Servizio sociale del Dipartimento Culture e società dell’Università degli Studi di Palermo: il Laboratorio Interdisciplinare di ricerca su Corpi, Diritti, Conflitti e il Laboratorio di Servizio sociale. Marginale è chi vive una condizione di estraneità e non-appartenenza al contesto sociale, chi viene a trovarsi ai margini, ai confini del sistema sociale, a distanza dai processi centrali di distribuzione delle risorse sociali, non solo materiali, a indicare che le disuguaglianze sociali sono strettamente riconducibili a gradi diversi di integrazione sociale, e che la q…
Marginalità, esclusione sociale e politiche di intervento. Studi e ricerche dei laboratori dei corsi di studio in servizio sociale
2022
Il volume raccoglie alcuni contributi scaturiti da attività di ricerca e didattica di due laboratori dei Corsi di studio in Servizio sociale del Dipartimento Culture e società dell’Università degli Studi di Palermo: il Laboratorio Interdisciplinare di ricerca su Corpi, Diritti, Conflitti e il Laboratorio di Servizio sociale. Marginale è chi vive una condizione di estraneità e non-appartenenza al contesto sociale, chi viene a trovarsi ai margini, ai confini del sistema sociale, a distanza dai processi centrali di distribuzione delle risorse sociali, non solo materiali, a indicare che le disuguaglianze sociali sono strettamente riconducibili a gradi diversi di integrazione sociale, e che la q…
Spontaneous Music-Evoked Autobiographical Memories in Individuals Experiencing Depression
2020
Listening to music often triggers strong memories of events from our past, which influence how we affectively experience music listening and can therefore contribute to music’s therapeutic capacity. The aim of this study was to examine the valence and content of spontaneous music-evoked autobiographical memories (MEAMs) in listeners with self-reported depression, who typically demonstrate negatively biased autobiographical memory. Eighteen depressed and 21 controls participated in a music-listening experiment where they listened to a personalized music stimulus, described their memories, and thereafter rated the valence of these memories and of their induced affect. Participants’ ratings w…