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See detailCalcium-induced conformational changes of the elicitor and membrane-active fengycin
Nasir, Mehmet Nail ULg; Lins, Laurence ULg; Ongena, Marc ULg et al

Poster (2012, April)

Fengycin is a natural lipopeptide synthetized by Bacillus subtilis strains. It is characterized by strong antifungal and low hemolytic activities. It seems also play a role in the promoting of elicitor ... [more ▼]

Fengycin is a natural lipopeptide synthetized by Bacillus subtilis strains. It is characterized by strong antifungal and low hemolytic activities. It seems also play a role in the promoting of elicitor activities of other compounds. The target of the biological activities of fengycin is supposed to be plasma membrane of sensitive cells. Even though the natural fengycin from has been discovered 25 years ago, nowadays, there is an increase of interest for this compound because of its potent applications. Until 15 years ago, the primary structure of fengycin was a matter of open debate before the publication of the corrected structure obtained by nuclear magnetic resonance and mass spectroscopy techniques. Although the infrared and ultraviolet absorption spectra of the lipopeptide were measured, no detailed analysis of these data was performed probably because of the unconventional sequence of the lipopeptide making these kinds of analyses complicated. In this work, our attempt was to analyze the conformational properties of fengycin as well as the calcium-induced changes using two complementary spectroscopic methods, Fourrier transformed infrared spectroscopy (FTIR) and circular dichroism (CD). In a first step, we have characterized the conformational properties of pure fengycin. The lipopeptide adopts turn conformation in trifluoroethanol, a membrane-mimicking solvent. D-aminoacids seem to be involved in intra molecular hydrogen bonds. In a second step, we have investigated the role played by Ca2+ ions on the possible conformational changes of fengycin. The addition of calcium gives rise to important modifications of the conformation. As fengycin has two glutamate residues, calcium is supposed to bind to their side chains. In conclusion, we have demonstrated that the conformation of fengycin is closely depending of the environment and the presence of calcium ions play an important role on the conformational changes of the lipopeptide. Moreover, spectra obtained both FTIR and CD methods ascertain the presence of turn conformation. [less ▲]

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See detailEffect of Transient Creep Strain Model on the Behavior of Concrete Columns Subjected to Heating and Cooling
Gernay, Thomas ULg

in Fire Technology (2012), 48(2), 313-329

In the numerical analysis of structures in fire, the material models that are used have important implications on the global behavior of the structure. In concrete, a particular phenomenon appears when ... [more ▼]

In the numerical analysis of structures in fire, the material models that are used have important implications on the global behavior of the structure. In concrete, a particular phenomenon appears when subjected to high temperatures: the transient creep strain. Models integrating explicitly a term for transient creep strain have been proposed in the literature but, in the current Eurocode 2 model, there is no explicit term for transient creep strain. This phenomenon is included in the Eurocode 2 model, but it is implicitly considered in the mechanical strain term. A series of experimental fire tests on axially restrained concrete columns subjected to heating and cooling has been recently performed at South China University of Technology and described by Wu et al. (Fire Technol 46:231–249). In the original paper, it was shown that using the implicit model of Eurocode 2, the behavior of the columns cannot be simulated properly, especially during the cooling phase. The objective of the present paper is to perform again the fire tests simulations using a new formulation of the Eurocode 2 model that contains an explicit term for transient creep. In the first part of the paper, the explicit formulation of the Eurocode 2 model is presented. In the second part, the fire tests are modeled with the software SAFIR using, on the one hand, the implicit Eurocode model and, on the other hand, the new explicit model. It is shown that the transient creep model has significant implications on the global behavior of structural concrete members, as the residual axial load sustained by the columns at the end of the fire can differ by up to 25% of the initial applied load depending on the transient creep strain model that is used for the calculation. The experimental behavior is better matched with the new explicit model than with the current Eurocode model. Particularly, the results given by the Eurocode model during the cooling phase are unconservative as the residual axial load is overestimated. Finally, it is explained why, on the basis of an example, in a performance-based approach, these results can have important implications on the global fire resistance of a structure. [less ▲]

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See detailFood control & food crisis: challenges in analyses
Focant, Jean-François ULg

Scientific conference (2012, April)

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See detailThe Venus nitric oxide nightglow vertical distribution : update, new features and modelling
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Soret, Lauriane ULg et al

Poster (2012, April)

Ultraviolet (UV) spectra of the delta (190-240 nm) and gamma (225-270 nm) bands of the nitric oxide (NO) molecule have been measured in the atmosphere of the Venus night side with the Spectroscopy for ... [more ▼]

Ultraviolet (UV) spectra of the delta (190-240 nm) and gamma (225-270 nm) bands of the nitric oxide (NO) molecule have been measured in the atmosphere of the Venus night side with the Spectroscopy for Investigation of Characteristics of the Atmosphere of Venus (SPICAV) instrument on board Venus Express (VEX). Excited NO molecules on the night side of the planet find their source in the radiative recombinaison of O(3P) and N(4S) atoms produced on the dayside by Extreme Ultraviolet (EUV) solar photons that cause photodissociation of CO2 and N2 molecules. We analyse with an improved statistics the behaviour of the vertical emission profile of the NO nightglow. We also present a method used to retrieve and analyse the volume emission rate. We describe the dependence of the vertical distribution with latitude and local time and its variability. New features in the vertical distribution of the NO emission such as double peaks are also exhibited. Furthermore, we use a one-dimensional chemical-diffusive model to compare the major features of the calculated O2 1.27 microm and NO UV emissions profiles with those observed with SPICAV. [less ▲]

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See detailETAPE - Rapport d’évaluation des résultats
Vanmeerbeek, Marc ULg; Bednarek, Stéphanie; Lachaussée, Sophie et al

Report (2012)

Contexte et objectifs ETAPE est un programme d’intervention précoce à domicile au bénéfice de familles à risque de négligence parentale. Le programme prend en charge des enfants de 0 à 30 mois, ainsi que ... [more ▼]

Contexte et objectifs ETAPE est un programme d’intervention précoce à domicile au bénéfice de familles à risque de négligence parentale. Le programme prend en charge des enfants de 0 à 30 mois, ainsi que leurs parents, au rythme d’une à deux visites à domicile par semaine. L’intervention consiste en des massages du bébé, des jeux psychomoteurs. Un temps important est en outre consacré à l’accompagnement et à la guidance du rôle parental. L’originalité du projet est qu’il est centré sur le développement psychomoteur et affectif du bébé en lien avec son ou ses parents. L’étude cherche à mesurer l’efficacité du programme en termes de développement psychomoteur de l’enfant, de qualité d’attachement au sein de la dyade parent-enfant et de compétences éducatives des parents. Méthodologie Les aptitudes psychomotrices de l’enfant ont été mesurées au moyen du test de Brunet et Lézine modifié, au début, en milieu et en fin d’intervention. Le caractère sécure ou non de l’attachement a été mesuré chez le caregiver par Q-Sort en début et en fin d’intervention. Les compétences parentales ont été évaluées tous les six mois durant l’intervention au moyen d’un questionnaire développé par l’équipe de recherche en 2008 (MASPIN) et complété par les intervenants sur base de leurs observations. Résultats Douze enfants ont été étudiés. Les trois quarts ont été pris en charge avant 1 an ; la durée moyenne d’intervention est de 11,3 mois. En moyenne, les enfants gagnent nettement en score de développement moteur global, gagnent un peu en socialisation, sont stables en développement moteur fin. La plupart régressent au score de langage, ce qui influence négativement le score global de développement. Deux enfants sur douze sont sécures au début et à la fin de l’intervention (mais ce ne sont pas les mêmes). Aucun ne termine l’intervention significativement insécurisé, mais la relation dans la dyade n’est en général pas optimale. Les résultats de MASPIN permettent d’étoffer les autres résultats obtenus et de mieux comprendre l’évolution au cas par cas. Discussion Les résultats, mesurés par les tests de Brunet-Lézine et le Q-Sort semblent modestes dans certains domaines, mais doivent être analysés à la lumière des conditions d’intervention. MASPIN a donné une vue beaucoup plus précise de la réalité et de son évolution. Ce questionnaire a aussi permis de monitorer l’intervention. Toutefois, la finesse des observations et l’aspect subjectif de la cotation empêchent une analyse globale des résultats ; la fidélité intercotateur doit encore être validée. MASPIN permet en outre de donner des repères pour le dialogue avec d’autres professionnels impliqués dans le suivi des situations, et fournit un canevas qui facilite la discussion avec les familles sur l’exercice de la parentalité et les objectifs d’intervention. L’analyse des résultats permet de prendre conscience que certaines compétences (par ex., le langage) méritent d’être mieux soutenues et stimulées par les intervenants de terrain.) Des collaborations extérieures devront être développées (par ex : psychologue, aide sociale). L’investissement requis de la part des intervenants est important. Le risque de découragement est grand ; ils doivent être soutenus et supervisés de façon efficace dans ce travail. L’instauration d’un vrai esprit d’équipe est indispensable Conclusion Le rendement de ce programme, destiné à un public particulièrement difficile, est intéressant mais variable selon les situations prises en charge, que ce soit en termes de développement psychomoteur ou d’attachement à la figure parentale. L’outil MASPIN se révèle précieux dans de multiples aspects de la prise en charge, depuis le dialogue avec les professionnels qui identifient la situation, jusqu’au monitorage des objectifs au fil de l’intervention, en passant par la construction des objectifs d’intervention avec les parents. [less ▲]

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See detailToward a Taxonomy of Key Success Factors for SME’s in a Changing Environment : the case of the Luxury Industry
Riguelle, France ULg; Van Caillie, Didier ULg

in Proceedings of the The 12th IAMB Conference (2012, April)

This paper aims at proposing a synthetic taxonomy of key success factors (KSF) for SME's in the luxury industry. Both typologies of KSF for SME's in overall on the one hand, and for companies of the ... [more ▼]

This paper aims at proposing a synthetic taxonomy of key success factors (KSF) for SME's in the luxury industry. Both typologies of KSF for SME's in overall on the one hand, and for companies of the luxury industry on the other hand, constructed on a basis of a critical literature review regarding the two domains concerned (SME's performance management and performance management of companies of the luxury industry) are gathered to propose a single synthetic taxonomy of KSF for SME's of the luxury industry. [less ▲]

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See detailLa médiation scolaire. Un regard des acteurs sur leurs pratiques
Kuty, Olgierd ULg; Schoenaers, Frédéric ULg; Dubois, Christophe ULg et al

Book published by Presses Universitaires de Liège (2012)

Dans nos sociétés en réseaux qui se caractérisent par un pluralisme normatif, on peut faire société sans partager des valeurs communes. Le fonctionnement des institutions scolaires illustre les nouveaux ... [more ▼]

Dans nos sociétés en réseaux qui se caractérisent par un pluralisme normatif, on peut faire société sans partager des valeurs communes. Le fonctionnement des institutions scolaires illustre les nouveaux modes de régulation des tensions, de la diversité, de l'intégration, etc. désormais à l’œuvre. C'est dans ce contexte que le concept de médiation a fait son apparition dans nos écoles, comme dispositif d'apaisement ou de maintien du lien social. La diffusion de tels dispositifs doit beaucoup à la création de services centraux puis locaux de médiation, tout comme au travail de nombreux médiateurs qui ont progressivement investi le champ scolaire. Cet ouvrage constitue une exploration du développement de leur fonction et il rend compte de la culture professionnelle qui les anime. Cette exploration conduit à s'interroger sur le processus de diffusion de la médiation scolaire tout en contextualisant cette dernière dans le spectre plus large de la médiation en général, un concept désormais répandu dans les champs familiaux, judiciaires, sanitaires, administratifs, politiques et sociaux les plus divers. [less ▲]

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See detailRèglement 1346/2000 relatif aux procédures d'insolvabilité
Wautelet, Patrick ULg; Leunen, Charles-Antoine

in van Drooghenbroeck, Jean-François (Ed.) Droit judiciaire européen et international (2012)

This paper presents an overview of court practice in relation to Regulation 1346/2000. The focus is on cases decided by the ECJ, Belgian and French courts. Reference is also made to the most important ... [more ▼]

This paper presents an overview of court practice in relation to Regulation 1346/2000. The focus is on cases decided by the ECJ, Belgian and French courts. Reference is also made to the most important cases decided by English courts. Cases are presented and discussed in relation to the various provisions of the Regulation to which they relate. For each case, an abstract is included, followed by (critical) comments. This overview appeared in a book presenting the main European regulations dealing with European procedural law (jurisdiction of courts, recognition and enforcement of foreign judgments). The book is part of a series edited by Prof. Georges de Leval (University of Liège), which collects court practice in relation to procedural law. [less ▲]

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See detailThe earthquake sedimentary record in marine sediment from cores in the western part of the Marmara Sea, Turkey
Drab, Laureen; Hubert, Aurelia ULg; Schmidt, Sabine et al

Conference (2012, April)

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See detailLong-term magnetic field monitoring of the Sun-like star \xi Bootis A
Morgenthaler, A.; Petit, P.; Saar, S. et al

in Astronomy and Astrophysics (2012), 540

Aims: We aim to investigate the long-term temporal evolution of the magnetic field of the solar-type star ξ Bootis A, both from direct magnetic field measurements and from the simultaneous estimate of ... [more ▼]

Aims: We aim to investigate the long-term temporal evolution of the magnetic field of the solar-type star ξ Bootis A, both from direct magnetic field measurements and from the simultaneous estimate of indirect activity indicators. Methods: We obtained seven epochs of high-resolution, circularly-polarized spectra from the NARVAL spectropolarimeter between 2007 and 2011, for a total of 76 spectra. Using approximately 6100 photospheric spectral lines covering the visible domain, we employed a cross-correlation procedure to compute a mean polarized line profile from each spectrum. The large-scale photospheric magnetic field of the star was then modelled by means of Zeeman-Doppler Imaging, allowing us to follow the year-to-year evolution of the reconstructed magnetic topology. Simultaneously, we monitored the width of several magnetically sensitive spectral lines, the radial velocity, the line asymmetry of intensity line profiles, and the chromospheric emission in the cores of the Ca II H and Hα lines. Results: During the highest observed activity states, in 2007 and 2011, the large-scale field of ξ Bootis A is almost completely axisymmetric and is dominated by its toroidal component. The toroidal component persists with a constant polarity, containing a significant fraction of the magnetic energy of the large-scale surface field through all observing epochs. The magnetic topologies reconstructed for these activity maxima are very similar, suggesting a form of short cyclicity in the large-scale field distribution. The mean unsigned large-scale magnetic flux derived from the magnetic maps varies by a factor of about 2 between the lowest and highest observed magnetic states. The chromospheric flux is less affected and varies by a factor of 1.2. Correlated temporal evolution, due to both rotational modulation and seasonal variability, is observed between the Ca II emission, the Hα emission and the width of magnetically sensitive lines. The rotational dependence of polarimetric magnetic measurements displays a weak correlation with other activity proxies, presumably due to the different spatial scales and centre-to-limb darkening associated with polarimetric signatures, as compared to non-polarized activity indicators. Better agreement is observed on the longer term. When measurable, the differential rotation reveals a strong latitudinal shear in excess of 0.2 rad d-1. [less ▲]

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See detailUne cellule d'encadrement pour les producteurs transformateurs
Helleputte, Murielle ULg; De Laubier, Juliette ULg; Di Tanna, Sybille ULg et al

in Wallonie Elevages (2012), 4

La Cellule Qualité Produits Fermiers possède un guichet unique auquel le producteur-transformateur peut s'adresser pour toute question relative à son projet de diversification. En fonction de la demande ... [more ▼]

La Cellule Qualité Produits Fermiers possède un guichet unique auquel le producteur-transformateur peut s'adresser pour toute question relative à son projet de diversification. En fonction de la demande, il est dirigé vers le ou les pôles compétents. [less ▲]

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See detailL'obésité de l'enfant: Rencontre et parole donnée
Battisti, Oreste ULg

Learning material (2012)

vidéo comprenant les interviews de certaines familles confrontés à l'obésité.

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See detailAdvances in proteomics for the FP7 Venomics project
Degueldre, Michel ULg; Quinton, Loïc ULg; De Pauw, Edwin ULg

Scientific conference (2012, April)

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See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2012)

Collision dans le Dragon; Trou noir de masse intermédiaire;Zoom sur une galaxie lointaine; Les jours de Vénus s’allongent ?; Lumière cendrée; Anomalies magnétiques lunaires; Océan martien; Hercule par le ... [more ▼]

Collision dans le Dragon; Trou noir de masse intermédiaire;Zoom sur une galaxie lointaine; Les jours de Vénus s’allongent ?; Lumière cendrée; Anomalies magnétiques lunaires; Océan martien; Hercule par le VST [less ▲]

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See detailGender and leadership
Cornet, Annie ULg

Speech/Talk (2012)

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