Search results for "PLASMA"
showing 10 items of 4043 documents
Mhd-Modeling of the Propagation of a Coronal Mass Ejection
2005
Hydrodynamic modeling of the propagation of a density perturbation launched upwards in the solar corona has been shown to explain some features of a Coronal Mass Ejection (CME) observed in detail with the SoHO/UVCS, but left open the questions of the evidence of thermal insulation of the CME and of its large expansion factor. We investigate whether the interaction with the coronal magnetic field is able to explain these aspects, by performing magnetohydrodynamic simulations. We solve the ideal MHD equations for a fully ionized compressible plasma with different assumptions on the ambient magnetic field, using the FLASH code. We include the effect of the directional thermal conduction. Preli…
Quantum Optics and Photonics 2021: Book of Abstracts : The 4th International Conference, Riga, 22-23 April 2021
2021
The conference was supported by ERDF project No. 1.1.1.5/19/A/003 “The Development of Quantum Optics and Photonics at the University of Latvia”
Identificación de biomarcadores no invasivos de endometriosis mediante metabolómica por RMN
2015
La endometriosis es una enfermedad ginecológica crónica, estrógeno dependiente, asociada a dolor pélvico e infertilidad. Se define por la presencia de tejido endometrial fuera de la cavidad uterina y representa uno de los desórdenes ginecológicos benignos más comunes. Los síntomas de la endometriosis son altamente variables, inespecíficos y comunes en la población general, lo que contribuye a un retraso en el diagnóstico que oscila entre 8-12 años. Actualmente, el “patrón de oro” para el diagnóstico de la endometriosis es la cirugía, normalmente mediante laparoscopia. Sin embargo, se trata de un procedimiento invasivo, que implica riesgos potenciales y no es apropiado para el seguimiento pe…
Mikroaaltoplasmageneraattorin happi- ja typpiplasmojen valoemissio näkyvän valon aallonpituusalueella
2016
Työssä analysoidaan matalan lämpötilan happi- ja typpiplasmojen emissiospektrejä näkyvän valon alueella. Työn teoreettisessa osiossa käydään läpi plasman määritelmä, törmäysreaktioiden vaikutusala, tuottotaajuuskertoimet, yksittäisen atomin sekä kaksiatomisen molekyylin viritystilat ja näistä johtuvat mahdolliset emissiopurkaustyypit. Kokeellisessa osassa esitellään mittauslaitteisto ja käydään läpi 2,45\,GHz mikroaaltoplasmageneraattorin operointiparametrien vaikutus valontuottoon. Tarkastellut operointiparametrit ovat magneettikentän voimakkuus, neutraalin kaasun paine ja plasmaa lämmittävän mikroaaltolähettimen teho. Happiplasman emissiospektri eroaa typpiplasman emissiospektristä. Happi…
Plasmalogens in the retina: From occurrence in retinal cell membranes to potential involvement in pathophysiology of retinal diseases
2014
Plasmalogens (Pls) represent a specific subclass of glycerophospholipids characterized by the presence of a vinyl-ether bond at the sn-1 position of glycerol. Pls are quantitatively important in membranes of neuronal tissues, including the brain and the retina, where they can represent until almost two-third of ethanolamine glycerophospholipids. They are considered as reservoirs of polyunsaturated fatty acids as several studies have shown that arachidonic and docosahexaenoic acids are preferentially esterified on Pls when compared to other glycerophospholipids. Reduced levels of Pls were observed in a number of neurodegenerative disorders such as glaucoma, the second leading cause of blindn…
Identification of a plasminogen-binding motif in PAM, a bacterial surface protein.
1995
Surface-associated plasmin(ogen) may contribute to the invasive properties of various cells. Analysis of plasmin(ogen)-binding surface proteins is therefore of interest. The N-terminal variable regions of M-like (ML) proteins from five different group A streptococcal serotypes (33, 41, 52, 53 and 56) exhibiting the plasminogen-binding phenotype were cloned and expressed in Escherichia coli. The recombinant proteins all bound plasminogen with high affinity. The binding involved the kringle domains of plasminogen and was blocked by a lysine analogue, 6-aminohexanoic acid, indicating that lysine residues in the M-like proteins participate in the interaction. Sequence analysis revealed that the…
The Internal Dynamics of Fibrinogen and Its Implications for Coagulation and Adsorption
2015
Fibrinogen is a serum multi-chain protein which, when activated, aggregates to form fibrin, one of the main components of a blood clot. Fibrinolysis controls blood clot dissolution through the action of the enzyme plasmin, which cleaves fibrin at specific locations. Although the main biochemical factors involved in fibrin formation and lysis have been identified, a clear mechanistic picture of how these processes take place is not available yet. This picture would be instrumental, for example, for the design of improved thrombolytic or anti-haemorrhagic strategies, as well as, materials with improved biocompatibility. Here, we present extensive molecular dynamics simulations of fibrinogen w…
Immunity, resistance and tolerance in bird-parasite interactions.
2013
12 pages; International audience; Interacting pathogens and hosts have evolved reciprocal adaptations whose function is to allow host exploitation (from the pathogen stand point) or minimize the cost of infection (from the host stand point). Once infected, two strategies are offered to the host: parasite clearing (resistance) or withstanding the infection while paying a low fitness cost (tolerance). In both cases, the immune system plays a central role. Interestingly, whatever the defence strategy adopted by the host, this is likely to have an effect on parasite evolution. Given their short generation time and large population size, parasites are expected to rapidly adapt to the environment…
The ATHENA X-ray Integral Field Unit (X-IFU)
2018
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States.
Damage monitoring on carbonate stones: Field exposure tests contributing to pollution impact evaluation in two Italian sites
2017
During the last decades, many studies have been carried out on environmental monitoring in specific sites aiming at their protection and conservation; however, researches focused on the direct implications, in terms of quantitative evaluation of stone deterioration, of these monitoring actions are still scarce. This experimental work aims at monitoring the degradation processes affecting historical buildings constituted by carbonate stones. Specifically, specimens of Carrara marble and two limestones largely used in the Sicilian Baroque architecture, namely Noto and Comiso stones, were exposed outdoor in two Italian sites (Catania and Palermo), which are characterized by different environme…