Search results for "fusion"
showing 10 items of 4513 documents
Dissection of keratin dynamics: different contributions of the actin and microtubule systems.
2005
It has only recently been recognized that intermediate filaments (IFs) and their assembly intermediates are highly motile cytoskeletal components with cell-type- and isotype-specific characteristics. To elucidate the cell-type-independent contribution of actin filaments and microtubules to these motile properties, fluorescent epithelial IF keratin polypeptides were introduced into non-epithelial, adrenal cortex-derived SW13 cells. Time-lapse fluorescence microscopy of stably transfected SW13 cell lines synthesizing fluorescent human keratin 8 and 18 chimeras HK8-CFP and HK18-YFP revealed extended filament networks that are entirely composed of transgene products and exhibit the same dynamic…
In vivo detection of cytokeratin filament network breakdown in cells treated with the phosphatase inhibitor okadaic acid.
2001
We have previously described vulva carcinoma-derived A-431 subclone AK13-1, which stably expresses fluorescently labeled cytokeratin filaments (CKFs). Time-lapse fluorescence microscopy of these cells permits the continuous monitoring of the dynamics of the CKF cytoskeleton in vivo. To study mechanisms and principles of CKF disassembly as it occurs, e.g., during mitosis and liver disease, we have treated cells with the phosphatase inhibitor okadaic acid (OA), which induces complete CKF network breakdown within 3–5 h without significantly affecting the organization of the actin- and tubulin-based cytofilaments. In time-lapse movies, we find that the network breakdown starts at the cell perip…
La diffusion des NTIC au sein du réseau urbain français et le rôle des acteurs publics
2001
The study deals with the ways in which the general public and the government make use of new information and communication technologies. We analyze the physical locations of Internet sites with “fr” as their domain names. The data were provided by the French NIC center (AFNIC). Using this sample (a quarter of all French sites), we find a rather even distribution of French sites in the Paris area plus the other main French cities, and the remainder of France. In addition, we try to enumerate the initiatives of the public actors responsible for the regional planning of the new information and communication technologies. Firstly, we clarify the economic and legal framework in which public acto…
Molecular ND Band Spectroscopy in the Divertor Region of Nitrogen Seeded JET Discharges
2018
In this contribution we present OES measurements in the JET tokamak of the deuterated NH (ND) radical and the correlation between results of those experiments and measurement of ammonia production. The observation region covers most of the divertor and its outer throat. Measurements are performed in different magnetic configurations. The results include temporal and spatial dependence of the molecular emission intensity and study of the emission band shape (vibrational and rotational temperatures) during different JET pulses, with or without nitrogen seeding. Results are a step towards the understanding of nitrogen-containing molecule creation and destruction in the divertor plasma. For com…
Efficiency investigation of a negative hydrogen ion beam production with the use of the gasdynamic ECR plasma source
2020
Abstract Negative hydrogen ion sources are of great demand in modern physics as injectors into accelerators and drivers for neutral beam injectors for fusion devices. It has been shown earlier that the use of the gasdynamic ECR discharge provides the opportunity to extract up to 80 mA/cm2 of negative ion current density. We studied experimentally the volumetric negative hydrogen ion production and vacuum ultraviolet emission in a gasdynamic ECR discharge. The high-density plasma was sustained by the pulsed 37 GHz / 100 kW gyrotron radiation in a magnetic configuration consisting of two consecutive simple mirror traps. The future prospects of the volumetric H− source based on the gasdynamic …
Parametric thermal analysis for the optimization of Double Walled Tubes layout in the Water Cooled Lithium Lead inboard blanket of DEMO fusion reactor
2019
Abstract Within the roadmap that will lead to the nuclear fusion exploitation for electric energy generation, the construction of a DEMOnstration (DEMO) reactor is, probably, the most important milestone to be reached since it will demonstrate the technological feasibility and economic competitiveness of an industrial-scale nuclear fusion reactor. In order to reach this goal, several European universities and research centres have joined their efforts in the EUROfusion action, funded by HORIZON 2020 UE programme. Within the framework of EUROfusion research activities, ENEA and University of Palermo are involved in the design of the Water-Cooled Lithium Lead Breeding Blanket (WCLL BB), that …
Speciation of neptunium during sorption and diffusion in natural clay
2016
In argillaceous rocks, which are considered as a potential host rock for nuclear waste repositories, sorption and diffusion processes govern the migration behaviour of actinides like neptunium. For the safety analysis of such a repository, a molecular-level understanding of the transport and retardation phenomena of radioactive contaminants in the host rock is mandatory. The speciation of Np during sorption and diffusion in Opalinus Clay was studied at near neutral pH using a combination of spatially resolved synchrotron radiation techniques. During the sorption and diffusion experiments, the interaction of 8 μM Np(V) solutions with the clay lead to the formation of spots at the clay-water …
Ramon Llull: un canone tutto per sé
2020
Riassunto: Desta sorpresa l’uso, a volte persino spregiudicato, che Ramon Llull fa della letteratura a lui contemporanea. Il maiorchino e stato capace di riutilizzare, piegandoli ai suoi fini, i generi di maggior successo del suo tempo: il romanzo cavalleresco, la poesia lirica o le raccolte di exempla e di miracoli diventano cosi strumento per divulgare e far capire quello che per Llull era il “libro migliore del mondo per la conversione degli infedeli”, ossia la sua Arte. Nella rilettura che proponiamo di alcuni frammenti della sua opera porteremo alcuni esempi di come funziona questa conversione della letteratura in ancella dell’Arte lulliana, per poter capire quali sono le strategie del…
L?atribució hipotètica de Curial e Güelfa a Enyego d?Àvalos (Consideracions sobre un «informe» de L. Badia i J. Torró)
2017
Resum: La revista Estudis Romanics 39 (2017) ha publicat el meu article: “Enyego d’Avalos, autor del Curial e Guelfa ?”, que resumeix una part de la meua tesi doctoral, La cort napolitana d’Alfons el Magnanim: el context del «Curial e Guelfa» (Universitat de Valencia, 2016). L’article defensa la hipotesi que Enyego d’Avalos –natural de Toledo, educat a Valencia, conseller de Felip Maria Visconti i gran camarlenc d’Alfons el Magnanim, al regne de Napols– hauria estat l’autor de la novel·la cavalleresca anonima Curial e Guelfa . Encara que la tesi es inedita, Lola Badia i Jaume Torro s’han manifestat en contra de la hipotesi mitjancant declaracions difamatories en mitjans de comunicacio i un …
Thermal activated carrier transfer between InAs quantum dots in very low density samples
2010
In this work we develop a detailed experimental study of the exciton recombination dynamics as a function of temperature on QD-ensembles and single QDs in two low density samples having 16.5 and 25 dots/¼m2. We corroborate at the single QD level the limitation of the exciton recombination time in the smallest QDs of the distribution by thermionic emission (electron emission in transient conditions). A portion of these emitted carriers is retrapped again in other (larger) QDs, but not very distant from those emitting the carriers, because the process is limited by the diffusion length at the considered temperature.