The role of segmentation and investor recognition through the lens of cross‐listing activity

Scientific conference (2013, April 19)

Development of quantitative approaches based on Surface Enhanced Raman Scattering chemical imaging

Poster (2013, April 18)

Molecular analysis of root medium impact on Arabidopsis thaliana development

Poster (2013, April 18)

Hydroponics and soil are the most common media used for plant growth. Hydroponics has the main advantage of providing easy access to the root system and is therefore commonly used for gene expression ... [more ▼]

Hydroponics and soil are the most common media used for plant growth. Hydroponics has the main advantage of providing easy access to the root system and is therefore commonly used for gene expression analyses in molecular studies of the model plant Arabidopsis thaliana. However, the impact of root substrate on plant growth remains poorly documented. Here we show that hydroponics accelerates both shoot growth and developmental phases as compared with culture on soil. In order to identify molecular changes in the roots that could account for these medium effects, a transcriptomic comparison was performed by microarray analysis. This experiment revealed that more than 20% of the genes were differentially expressed in hydroponics vs soil. Among them, the flowering time gene FLOWERING LOCUS C and two clades of microRNA targeted genes. To further assess the role of these genes in roots, artificial microRNAs were designed for root specific expression in transgenic Arabidopsis plants. [less ▲]

Innover en formation des enseignants : pour quoi, sur quoi, comment ?

Scientific conference (2013, April 18)

Réflexion sur l'innovation dans le domaine de la formation des enseignants, sur les motifs d'innovation, les domaines dans lesquels elle peut s'envisager et les conditions organisationnelles d'innovations ... [more ▼]

Réflexion sur l'innovation dans le domaine de la formation des enseignants, sur les motifs d'innovation, les domaines dans lesquels elle peut s'envisager et les conditions organisationnelles d'innovations. Ce texte est développé dans le cadre d'un atelier intervenant lors du colloque de l' European Institute of Education and social Policy [less ▲]

Le cinéma belge francophone.

Conference given outside the academic context (2013)

Particle-accelerating colliding-wind binaries: from the study of a few objects to a science case study

Conference (2013, April 18)

The study of massive stars, and in particular of colliding-wind binaries, revealed the capability of some of them to accelerate particles up to relativistic energies. Since the 1980's, what appeared at ... [more ▼]

The study of massive stars, and in particular of colliding-wind binaries, revealed the capability of some of them to accelerate particles up to relativistic energies. Since the 1980's, what appeared at first sight to be an anomaly in their observational properties turns out to be the signature of important physical processes at work in a large number of objects. In this contribution, I summarize the current census of information relevant to the catalogue of Particle-Accelerating Colliding-Wind Binaries (PACWBs) that constitute a particular class of objects likely to contribute to the production of low energy Galactic cosmic-rays. On the basis of this census of information, some prospects for future observational strategies are discussed. [less ▲]

L'-band AGPM vector vortex coronagraph's first light on VLT/NACO: Discovery of a late-type companion at two beamwidths from an F0V star

in Astronomy and Astrophysics (2013), 552

Context. High contrast imaging has thoroughly combed through the limited search space accessible with first-generation ground-based adaptive optics instruments and the Hubble Space Telescope. Only a few ... [more ▼]

Context. High contrast imaging has thoroughly combed through the limited search space accessible with first-generation ground-based adaptive optics instruments and the Hubble Space Telescope. Only a few objects were discovered, and many non-detections reported and statistically interpreted. The field is now in need of a technological breakthrough. Aim. Our aim is to open a new search space with first-generation systems such as NACO at the Very Large Telescope, by providing ground-breaking inner working angle (IWA) capabilities in the L' band. The L' band is a sweet spot for high contrast coronagraphy since the planet-to-star brightness ratio is favorable, while the Strehl ratio is naturally higher. Methods. An annular groove phase mask (AGPM) vector vortex coronagraph optimized for the L' band, made from diamond subwavelength gratings was manufactured and qualified in the lab. The AGPM enables high contrast imaging at very small IWA, potentially being the key to unexplored discovery space. Results. Here we present the installation and successful on-sky tests of an L'-band AGPM coronagraph on NACO. Using angular differential imaging, which is well suited to the rotational symmetry of the AGPM, we demonstrated a \Delta L' > 7.5 mag contrast from an IWA ~ 0".09 onwards, during average seeing conditions, and for total integration times of a few hundred seconds. [less ▲]

Computers As Genomic Time Machines for Meeting our Ancestors

Scientific conference (2013, April 18)

L'ennemi devenu partenaire. Quelques considérations sur les relations belgo-allemandes depuis 1945

Scientific conference (2013, April 17)

Les relations politiques entre la Belgique et son grand voisin à l’est sont aujourd’hui parmi les plus proches en Europe occidentale. Au vu de deux occupations allemandes en un quart de siècle, il est ... [more ▼]

Les relations politiques entre la Belgique et son grand voisin à l’est sont aujourd’hui parmi les plus proches en Europe occidentale. Au vu de deux occupations allemandes en un quart de siècle, il est toutefois remarquable de constater que les origines de ce bon voisinage remontent aux premières années de l’après-guerre. Quelles sont les raisons de ce rapprochement rapide ? Quels sont les acteurs des relations belgo-allemandes après 1945 ? Est-ce qu’on peut parler d’une « réconciliation » au niveau sociétal ? Quelle était la position de la Belgique face à la réunification de 1990 ? Les réponses à ces questions ne se retrouvent pas seulement dans la « grande Histoire » des hommes d’État et diplomates, mais également dans l’histoire régionale de l’espace frontalier belgo-allemand. [less ▲]

La sécurité alimentaire et nutritionnelle au Niger : l'identification des populations vulnérables

Conference given outside the academic context (2013)