Search results for "SPECT"
showing 10 items of 28650 documents
Vertex corrections for positive-definite spectral functions of simple metals
2016
We present a systematic study of vertex corrections in the homogeneous electron gas at metallic densities. The vertex diagrams are built using a recently proposed positive-definite diagrammatic expansion for the spectral function. The vertex function not only provides corrections to the well known plasmon and particle-hole scatterings, but also gives rise to new physical processes such as generation of two plasmon excitations or the decay of the one-particle state into a two-particles-one-hole state. By an efficient Monte Carlo momentum integration we are able to show that the additional scattering channels are responsible for the bandwidth reduction observed in photoemission experiments on…
La problematica del colore negli "smaltini di calcara" palermitani
2008
Le vignoble français face au changement climatique : l'élaboration d’une stratégie d’adaptation à partir de scénarios de prospective
2021
National audience
Book Review : Kallio, E. (Editor). (2020). Development of adult thinking: Interdisciplinary perspectives on cognitive development and adult learning.…
2021
Formes urbaines et ilots de chaleurs : simulations et outils d'aide à la décision pour une ville durable
2017
National audience; Le monde s’urbanise. Selon les nations unies, plus d’un humain sur deux réside en milieu urbain et un septième de la population habite une agglomération millionnaire. Il s’agit d’une des mutations majeures de l’époque contemporaine. Chaque ville possède des caractéristiques propres (humaines, morphologiques...) mais l’Îlot de Chaleur Urbain (ICU) apparaît comme un phénomène inhérent et commun à toutes. En août 2003, l’Europe a subi une périodeestivale caniculaire ayant causé la mort de plus de 70 000 personnes dont 20 000 uniquement en France (Robine et al, 2008).
Hacia la superación de las desigualdades de género entre las y los adolescentes: proceso de toma de conciencia
2013
Esta tesis trata de una investigación cualitativa que analiza cómo las y los doce adolescentes (06 chicas y 06 chicos), con edades entre 15 y 18 años, oriundos de comunidades de renta-baja de Recife/Pernambuco-Brasil abordan el tema de las relaciones amorosas y de la violencia de género, desde una perspectiva feminista y de género. Se tiene en cuenta las idiosincrasias que el sistema patriarcal, heteronormativo y capitalista provoca en las formas de ser-estar adolescentes en la actualidad, las cuales resultan limitadoras, especialmente en contextos de vulnerabilidad. La justificación teórico-metodológica apunta para el uso de la técnica del grupo focal intra-sexo e inter-sexo en el proceso …
L’irrespect sur les réseaux socionumériques
2018
Systematic Comparison of Epidemic and Non-Epidemic Carbapenem Resistant Klebsiella pneumoniae Strains
2021
Over the past few decades, extensively drug resistant (XDR) resistant Klebsiella pneumoniae has become a notable burden to healthcare all over the world. Especially carbapenemase-producing strains are problematic due to their capability to withstand even last resort antibiotics. Some sequence types (STs) of K. pneumoniae are significantly more prevalent in hospital settings in comparison to other equally resistant strains. This provokes the question whether or not there are phenotypic characteristics that may render certain K. pneumoniae more suitable for epidemic dispersal between patients, hospitals, and different environments. In this study, we selected seven epidemic and non-epidemic ca…
Conformational Dynamics of the Dengue Virus Protease Revealed by Fluorescence Correlation and Single-Molecule FRET Studies.
2021
The dengue virus protease (DENV-PR) represents an attractive target for counteracting DENV infections. It is generally assumed that DENV-PR can exist in an open and a closed conformation and that active site directed ligands stabilize the closed state. While crystal structures of both the open and the closed conformation were successfully resolved, information about the prevalence of these conformations in solution remains elusive. Herein, we address the question of whether there is an equilibrium between different conformations in solution which can be influenced by addition of a competitive inhibitor. To this end, DENV-PR was statistically labeled by two dye molecules constituting a FRET …
STAT1 and Its Crucial Role in the Control of Viral Infections
2022
The signal transducer and activator of transcription (STAT) 1 protein plays a key role in the immune response against viruses and other pathogens by transducing, in the nucleus, the signal from type I, type II and type III IFNs. STAT1 activates the transcription of hundreds of genes, some of which have been well characterized for their antiviral properties. STAT1 gene deletion in mice and complete STAT1 deficiency in humans both cause rapid death from severe infections. STAT1 plays a key role in the immunoglobulin class-switch recombination through the upregulation of T-bet; it also plays a key role in the production of T-bet+ memory B cells that contribute to tissue-resident humoral memory…