High-Energy Physics with Particles Carrying Non-Zero Orbital Angular Momentum

in Few-Body Systems (2011)

Thanks to progress in optics in the past two decades, it is possible to create photons carrying well-defined non-zero orbital angular momentum (OAM). Boosting these photons into high-energy range ... [more ▼]

Thanks to progress in optics in the past two decades, it is possible to create photons carrying well-defined non-zero orbital angular momentum (OAM). Boosting these photons into high-energy range preserving their OAM seems feasible. Intermediate energy electrons with OAM have also been produced recently. One can, therefore, view OAM as a new degree of freedom in high-energy collisions and ask what novel insights it can bring. Here we discuss generic features of scattering processes involving twisted particles in the initial state. We show that they make it possible to perform a Fourier analysis of a plane wave cross section with respect to the azimuthal angles of the initial particles, and to probe the autocorrelation function of the amplitude, a quantity inaccessible in plane wave collisions. [less ▲]

2009-2010 Russo-franco-latvian expeditions in the Main Devonian Field (North-western Russia)

in Lebedev, Oleg; Ivanov, Alexander (Eds.) Palaeozoic Early Vertebrates II - Obruchev Symposium - Abstracts (2011)

In the frame of an international project between the Paleontological Institute of Moscow and the Museum of Paris, a Russo-Franco-Latvian team has been set up to prospect the Main Devonian Field in North ... [more ▼]

In the frame of an international project between the Paleontological Institute of Moscow and the Museum of Paris, a Russo-Franco-Latvian team has been set up to prospect the Main Devonian Field in North-Western Russia (Novgorod and Leningrad Regions). This joined project started in 2009 (one month of field trip), continued in 2010 (one month also) and will end in 2011. The two first years were mainly devoted to the prospecting of historical localities, some discovered and/or exploited by Dmitry Obruchev himself. Such a method is effective but quite time-consuming; i.e. to rediscover the accurate location of the localities by discussing with denizens, to fathom the archives out and to access to non-weathered layers by removing the altered surface. Novgorod and Leningrad Regions are topographically excessively flat. Devonian fields have not been disrupted by tectonic movements and the layers are thus horizontal. Rocks are most often quite unconsolidated (consisting of loose sands or clays) and excavations are thus relatively easy. The lack of relief and the vegetal cover unfortunately lead to few outcrops in the landscape. They are all located along rivers (Lovat’, Syas' and Oredesh rivers for instance) or are represented by outliers. Although most of the localities were easily accessible by cars, others required several kilometers by feet and/or by boat. Roughly 30 localities have been prospected. About one third of them are very interesting such as Borshovo and Goryn' (Luga District) which provided numerous and exquisite fossils of placoderms, agnathans and sarcopterygians. The original locality of the Frasnian tetrapod Obruchevichthys in Russia, Sondala (Leningrad Region), has been rediscovered with near certainty. [less ▲]

The reduction of the stress response by jasmonic acid and putrescine has a beneficial effect on in vitro tuber formation and development of yam

in Plant Abiotic Stress: From Systems Biology to Sustainable Agriculture 4th International Workshop - Cost Action FA0605 17-17 November 2011 (2011)

Pour le discours incitatif. Qu'apprendre aux maitres à dire à leurs élèves pour inciter ces derniers à lire les oeuvres littéraires en leur prêtant la qualité d'attention requise par l'intention artistique ?

in Repères : Recherches en Didactique du Français Langue Maternelle (2011), 43

L’apprentissage de l’expression d’un « jugement de gout motivé » et celui de l’expression d’un « jugement de valeur argumenté » sont, pour nous, à compter au nombre des activités de classe et de formation ... [more ▼]

L’apprentissage de l’expression d’un « jugement de gout motivé » et celui de l’expression d’un « jugement de valeur argumenté » sont, pour nous, à compter au nombre des activités de classe et de formation des maitres relatives à la lecture littéraire. L’énoncé de ces jugements peut se couler dans le moule du discours incitatif, engageant un public déterminé à lire ou à ne pas lire une œuvre littéraire donnée, voire un fragment de l’œuvre en question. Après avoir dit pourquoi il nous parait souhaitable d’aguerrir les futurs maitres à cette activité, nous faisons état d’une investigation portant sur des discours incitatifs produits par des enseignants, par de futurs formateurs d’enseignants et par de futurs enseignants, ces trois catégories œuvrant ou étant sur le point d’œuvrer à des niveaux d’études couvrant l’ensemble de la scolarité obligatoire. [less ▲]

Analyse des risques et autocontrôle en production

Learning material (2011)

Cystatin C as a GFR Marker in Renal Transplantation: Promises and Challenges.

in Cohen, J. B.; Ryseck, L. P. (Eds.) Cystatins: Protease Inhibitors, Biomarkers and Immunomodulators (2011)

The hidden function of NIK (NF-κB-Inducing Kinase) in cell death

Conference (2011)

Développement d’un modèle hydrologique sol et zone vadose afin d’évaluer l’impact des pollutions diffuses et des mesures d’atténuation sur la qualité des eaux en Région wallonne

Doctoral thesis (2011)

Implementation of new European directives in the environmental field and, specially, in the water field, generate a request from policy-makers for news tools able to evaluate impact of measures token in ... [more ▼]

Implementation of new European directives in the environmental field and, specially, in the water field, generate a request from policy-makers for news tools able to evaluate impact of measures token in order to reduce pressures on ecosystems. In this context, the objective of this PhD thesis is to develop a “soil and vadose” hydrological model in order to evaluate impact of diffuses pollutions and mitigation measures on water quality in the Walloon region. The “soil and vadose zone” model of the Walloon region (EPICgrid model) has been developed at catchment scale with an original modular concept on the basis of the field scale “water-soil-plant” EPIC model (Williams et al., 1984). After that the model was validated at field scale and at catchment scale, the EPICgrid model was used to simulate the hydrological behaviour of the Walloon region catchments and to produce environmental indicators for surface water and groundwater bodies of the Walloon region. The simulated fluxes are related to unsaturated or temporarily saturated soils. The simulations are focused, on the one hand, on hydrological balance terms (direct runoff, subsurface fluxes, groundwater recharge, soil moisture variability, actual evapotranspiration) and, on the other hand, on associated fluxes of nitrogen, phosphorus, organic matters and sediments, from agricultural origin. The EPICgrid model was then used to evaluate water quality impact of mitigation measures token in order to reduce agricultural diffuse pollution effect on the quality on surface water and groundwater bodies in the Walloon region. [less ▲]

Response to comment on "preserved feedforward but impaired top-down processes in the vegetative state".

in Science (2011), 334(6060), 1203

King et al. raise some technical issues about our recent study showing impaired top-down processes in the vegetative state. We welcome the opportunity to provide more details about our methods and results ... [more ▼]

King et al. raise some technical issues about our recent study showing impaired top-down processes in the vegetative state. We welcome the opportunity to provide more details about our methods and results and to resolve their concerns. We substantiate our interpretation of the results and provide a point-by-point response to the issues raised. [less ▲]

Monofunctional transglycosylases are not essential for Staphylococcus aureus cell wall synthesis.

in Journal of Bacteriology (2011), 193(10), 2549-56

The polymerization of peptidoglycan is the result of two types of enzymatic activities: transglycosylation, the formation of linear glycan chains, and transpeptidation, the formation of peptide cross ... [more ▼]

The polymerization of peptidoglycan is the result of two types of enzymatic activities: transglycosylation, the formation of linear glycan chains, and transpeptidation, the formation of peptide cross-bridges between the glycan strands. Staphylococcus aureus has four penicillin binding proteins (PBP1 to PBP4) with transpeptidation activity, one of which, PBP2, is a bifunctional enzyme that is also capable of catalyzing transglycosylation reactions. Additionally, two monofunctional transglycosylases have been reported in S. aureus: MGT, which has been shown to have in vitro transglycosylase activity, and a second putative transglycosylase, SgtA, identified only by sequence analysis. We have now shown that purified SgtA has in vitro transglycosylase activity and that both MGT and SgtA are not essential in S. aureus. However, in the absence of PBP2 transglycosylase activity, MGT but not SgtA becomes essential for cell viability. This indicates that S. aureus cells require one transglycosylase for survival, either PBP2 or MGT, both of which can act as the sole synthetic transglycosylase for cell wall synthesis. We have also shown that both MGT and SgtA interact with PBP2 and other enzymes involved in cell wall synthesis in a bacterial two-hybrid assay, suggesting that these enzymes may work in collaboration as part of a larger, as-yet-uncharacterized cell wall-synthetic complex. [less ▲]