Observation of a New Type of Low Frequency Waves at Comet 67P/Churyumov-Gerasimenko

We report on magnetic field measurements made in the innermost coma of 67P/Churyumov-Gerasimenko in its low activity state. Quasi-coherent, large-amplitude ($\delta B/B \sim 1$), compressional magnetic field oscillations at $\sim$ 40 mHz dominate the immediate plasma environment of the nucleus. This differs from previously studied comet-interaction regions where waves at the cometary ion gyro-frequencies are the main feature. Thus classical pick-up ion driven instabilities are unable to explain the observations. We propose a cross-field current instability associated with newborn cometary ion currents as a possible source mechanism.Comment: 6 pages, 3 Figure

Extending ontologies by finding siblings using set expansion techniques

Motivation: Ontologies are an everyday tool in biomedicine to capture and represent knowledge. However, many ontologies lack a high degree of coverage in their domain and need to improve their overall quality and maturity. Automatically extending sets of existing terms will enable ontology engineers to systematically improve text-based ontologies level by level

Mass-loading, pile-up, and mirror-mode waves at comet 67P/Churyumov-Gerasimenko

International audienceThe data from all Rosetta plasma consortium instruments and from the ROSINA COPS instrument are used to study the interaction of the solar wind with the outgassing cometary nucleus of 67P/Churyumov-Gerasimenko. During 6 and 7 June 2015, the interaction was first dominated by an increase in the solar wind dynamic pressure, caused by a higher solar wind ion density. This pressure compressed the draped magnetic field around the comet, and the increase in solar wind electrons enhanced the ionization of the outflow gas through collisional ionization. The new ions are picked up by the solar wind magnetic field, and create a ring/ring-beam distribution, which, in a high-β plasma, is unstable for mirror mode wave generation. Two different kinds of mirror modes are observed: one of small size generated by locally ionized water and one of large size generated by ionization and pickup farther away from the comet

Comparison of 1.0 M gadobutrol and 0.5 M gadopentate dimeglumine-enhanced MRI in 471 patients with known or suspected renal lesions: Results of a multicenter, single-blind, interindividual, randomized clinical phase III trial

The purpose of this phase III clinical trial was to compare two different extracellular contrast agents, 1.0 M gadobutrol and 0.5 M gadopentate dimeglumine, for magnetic resonance imaging (MRI) in patients with known or suspected focal renal lesions. Using a multicenter, single-blind, interindividual, randomized study design, both contrast agents were compared in a total of 471 patients regarding their diagnostic accuracy, sensitivity, and specificity to correctly classify focal lesions of the kidney. To test for noninferiority the diagnostic accuracy rates for both contrast agents were compared with CT results based on a blinded reading. The average diagnostic accuracy across the three blinded readers ('average reader') was 83.7% for gadobutrol and 87.3% for gadopentate dimeglumine. The increase in accuracy from precontrast to combined precontrast and postcontrast MRI was 8.0% for gadobutrol and 6.9% for gadopentate dimeglumine. Sensitivity of the average reader was 85.2% for gadobutrol and 88.7% for gadopentate dimeglumine. Specificity of the average reader was 82.1% for gadobutrol and 86.1% for gadopentate dimeglumine. In conclusion, this study documents evidence for the noninferiority of a single i.v. bolus injection of 1.0 M gadobutrol compared with 0.5 M gadopentate dimeglumine in the diagnostic assessment of renal lesions with CE-MRI

In vivo characterization of the bacterial intramembrane-cleaving protease RseP using the heme binding tag-based assay iCliPSpy

Peer reviewe

Implication de PML et des corps nucléaires PML dans la réponse antivirale des IFN de type I contre les picornavirus

PML nuclear bodies (NBs) are dynamic intranuclear structures harbouring numerous transiently localised proteins. PML is directly induced by interferons. Another protein induced by interferon implied in this effect is p53. We demonstrate the molecular events following poliovirus infection that lead to PML-dependent p53 activation and protection against virus infection. Poliovirus infection induces PML phosphorylation through ERK pathway, increases PML SUMOylation, and induces its transfert from the nucleoplasm to the nuclear matrix. These events result in the recruitment of p53 to NBs, p53 phosphorylation and activation of p53 target genes leading to the induction of apoptosis and inhibition of viral replication. This effects requires the presence of PML, is transient as poliovirus targets p53 by inducing its degradation in proteasome dependent manner. Our results provides evidence of how poliovirus counteracts p53 antiviral activity by regulating PML thus leading to p53 degradation.PML (Promyelocytic Leukemia), protéine induite par l'interféron, est impliquée dans la régulation de nombreux processus cellulaires tels que l'inhibition de la croissance, l'apoptose et la défense antivirale. PML est localisée dans le nucléoplasme et sur une structure appelée corps nucléaires (CN) dont PML est l organisatrice. Le poliovirus réorganise les CN et induit le recrutement de PML sur ces structures. Ce transfert fait intervenir la phosphorylation par ERK de PML et ensuite sa SUMOylation. Ces événements ont comme conséquence le recrutement de p53 sur les CN et à l activation de p53 menant à l'induction de l'apoptose et à l'inhibition de la réplication virale. Le poliovirus contrecarre cette réponse cellulaire en induisant la dégradation de p53 via le proteasome sur les CN.VERSAILLES-BU Sciences et IUT (786462101) / SudocSudocFranceF

Weak Inclusion for XML Types ⋆

Abstract. Considering that the unranked tree languages L(G) and L(G ′ ) are those defined by given non-recursive XML types G and G ′,this paper proposes a simple and intuitive method to verify whether L(G) is “approximatively ” included in L(G ′). Our approximative criterion consists in weakening the father-children relationships. Experimental results are discussed, showing the efficiency of our method in many situations.