Search results for "BEC"
showing 10 items of 947 documents
‘Dry’ electrochemistry: A non-invasive approach to the characterization of archaeological iron objects
2021
A methodology for monitoring the corrosion state of archaeological iron objects using ‘dry’ open circuit potential (OCP) measurements is described. Application of this technique to a set of objects from La Bastida de les Alcusses archaeological site (Moixent, València, Spain), dating back to the 4th century BCE, reveals significant differences depending on the conservation state. The transient OCP responses (which last between a few seconds and 10–15 min) were superimposed with much shorter (less than one second) intense features. Fil: Doménech Carbó, Antonio. Universidad de Valencia; España Fil: Peiró Ronda, María Amparo. Museu de Prehistòria de València; España Fil: Vives Ferrándiz, Jaime…
The Friedreich's Ataxia protein frataxin modulates DNA base excision repair in prokaryotes and mammals
2010
DNA-repair mechanisms enable cells to maintain their genetic information by protecting it from mutations that may cause malignant growth. Recent evidence suggests that specific DNA-repair enzymes contain ISCs (iron–sulfur clusters). The nuclearencoded protein frataxin is essential for the mitochondrial biosynthesis of ISCs. Frataxin deficiency causes a neurodegenerative disorder named Friedreich's ataxia in humans. Various types of cancer occurring at young age are associated with this disease, and hence with frataxin deficiency. Mice carrying a hepatocyte-specific disruption of the frataxin gene develop multiple liver tumours for unresolved reasons. In the present study, we show that frata…
Post-fotografia etnografica
2021
È evidente come la nostra società tecnologica sia legata senza alcun dubbio alla diffusione delle immagini. Autori come Gottfried Boehm, John Mitchell, Hans Belting hanno indagato la natura dell'immagine ponendo le basi, negli anni Novanta, per l'idea di un pictorial turn, di una cultura totalmente dominata dalle immagini che è diventata adesso una possibilità tecnica reale su scala globale. Un nuovo statuto dell'immagine che si usa raccogliere sotto l'etichetta di iconic turner inserito nel più vasto campo visual culture studies. L'uso del termine cultura accanto a quello di visuale è indicativo dell'ampiezza del campo d'indagine che visual culture studies si prefiggono di ricercare: essi …
The Highly Collimated Radio Jet of HH 80–81: Structure and Nonthermal Emission
2017
Radio emission from protostellar jets is usually dominated by free-free emission from thermal electrons. However, in some cases, it has been proposed that non-thermal emission could also be present. This additional contribution from non-thermal emission has been inferred through negative spectral indices at centimeter wavelengths in some regions of the radio jets. In the case of HH 80-81, one of the most powerful protostellar jets known, linearly polarized emission has also been detected, revealing that the non-thermal emission is of synchrotron nature from a population of relativistic particles in the jet. This result implies that an acceleration mechanism should be taking place in some pa…
Continuity and Novelty in Kantʼs Historical Conception in The Conflict of the Faculties
2017
En el trabajo analizamos algunas continuidades y novedades fundamentales en la concepción kantiana de la historia en el texto El conflicto de las facultades (1798) en comparación con su perspectiva histórica previa, fundamentalmente, de Idea para una historia universal en clave cosmopolita. Mostramos que, en líneas generales, Kant conserva el marco teórico a partir del cual explica el desarrollo histórico en sus textos anteriores, es decir, los conceptos de disposiciones humanas y de circunstancias externas de desenvolvimiento de dichas disposiciones. Sin embargo, en 1798 modifica el tipo de disposiciones que cumplen el rol explicativo en el desarrollo histórico pues ahora es la disposición…
Sensitive magnetometry reveals inhomogeneities in charge storage and weak transient internal currents in Li-ion cells
2020
The ever-increasing demand for high-capacity rechargeable batteries highlights the need for sensitive and accurate diagnostic technology for determining the state of a cell, for identifying and localizing defects, and for sensing capacity loss mechanisms. Here, we leverage atomic magnetometry to map the weak induced magnetic fields around Li-ion battery cells in a magnetically shielded environment. The ability to rapidly measure cells nondestructively allows testing even commercial cells in their actual operating conditions, as a function of state of charge. These measurements provide maps of the magnetic susceptibility of the cell, which follow trends characteristic for the battery materia…
Syndicats et dialogue social. Les modèles occidentaux à l'épreuve
2016
International audience; Une même question a été posée à une équipe de chercheurs spécialisés dans les relations du travail dans les principales économies post-industrielles de ce début du 21e siècle : comment a évolué la régulation sociale dans les entreprises depuis une trentaine d’années ? Leurs réponses montrent que les restructurations économiques, l’européanisation et la mondialisation ont conduit à d’importants changements, rarement volontaires, dans les relations entre les « partenaires sociaux » : organisations syndicales et patronales, sans oublier l’État, qui joue souvent un rôle d’arbitre. Ainsi, les modèles nationaux hérités du 20e siècle ont été remis en cause. Les particularis…
Los laboratorios de la Junta para Ampliación de Estudios e Investigaciones Científicas (J.A.E.) y la Residencia de Estudiantes (1912-1939)
2007
-Jose.Luis.Barona@uv.es La política de jóvenes pensionados científicos en el extranjero desarrollada por la JAE tuvo un complemento importante en la puesta en marcha de una serie de pequeños laboratorios científicos y centros de investigación agrupados principalmente en el Instituto Nacional de Ciencias y la Residencia de Estudiantes. El presente artículo aporta una perspectiva general de la labor realizada por algunos de esos laboratorios, sus principales protagonistas y grupos de investigación, particularmente los relacionados con las investigaciones biomédicas. No se analiza la labor del Instituto Cajal o el Museo de Ciencias Naturales, que son objeto de otras contribuciones en este mism…
A method for soil moisture probes calibration and validation of satellite estimates
2017
Graphical abstract
Data from: Plant – herbivorous beetle networks: molecular characterization of trophic ecology within a threatened steppic environment
2015
DNA barcoding facilitates many evolutionary and ecological studies, including the examination of the dietary diversity of herbivores. In this study, we present a survey of ecological associations between herbivorous beetles and host plants from seriously threatened European steppic grasslands. We determined host plants for the majority (65%) of steppic leaf beetles (55 species) and weevils (59) known from central Europe using two barcodes (trnL and rbcL) and two sequencing strategies (Sanger for mono/oligophagous species and Illumina for polyphagous taxa). To better understand the ecological associations between steppic beetles and their host plants, we tested the hypothesis that leaf beetl…