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See detailLa tablette de Mendeleïev
Pirard, Eric ULg

Conference given outside the academic context (2013)

De l’Age de la Pierre à l’Age du Lithium, nous n’avons eu de cesse de perfectionner nos technologies. Progressant dans la découverte et la compréhension de notre environnement, nous nous sommes mis à ... [more ▼]

De l’Age de la Pierre à l’Age du Lithium, nous n’avons eu de cesse de perfectionner nos technologies. Progressant dans la découverte et la compréhension de notre environnement, nous nous sommes mis à exploiter toutes les ressources naturelles disponibles. Aujourd’hui, il n’y a pratiquement aucun élément du tableau de Mendeleïev qui ne trouve son champ d’application spécifique : du lithium dans les batteries à l’indium dans les écrans en passant par le tantale dans les capacités. Baignant quotidiennement dans un tel univers d’abondance, nous en oublions d’où proviennent ces ressources et nous ignorons souvent que des dizaines de mines ont dû être ouvertes pour assouvir notre besoin de consommation. Depuis que la Chine en 2009 a menacé de ne plus exporter ses fameuses terres rares, l’Europe s’inquiète au plus haut point de la dépendance de son industrie vis-à-vis de matières premières devenues critiques. Pour l’Europe, cela signifie concrètement qu’il est temps de relancer la prospection du sous-sol et de développer une culture du recyclage intelligente et écologique. Au travers de quelques exemples choisis, cet exposé présentera l’évolution des technologies et la nature des matières premières utilisées. Par la nature des exemples et l’accent mis sur le recyclage, cette conférence vient en complément de celle consacrée à « Ressources dans le Rouge pour les Energies Vertes ? » qui est disponible en PodCast sur le site http://www.reflexions.ulg.ac.be [less ▲]

Detailed reference viewed: 6 (2 ULg)
See detail"Une traversée des images : Film ist. de Gustav Deutsch"
Belloi, Livio ULg

Scientific conference (2013, November 13)

Cette conférence invite à considérer "Film ist.", l'œuvre monumentale de l'artiste autrichien Gustav Deutsch, comme une véritable traversée des images. Après une brève présentation du cinéaste, il s'agit ... [more ▼]

Cette conférence invite à considérer "Film ist.", l'œuvre monumentale de l'artiste autrichien Gustav Deutsch, comme une véritable traversée des images. Après une brève présentation du cinéaste, il s'agit de reparcourir chronologiquement les trois volets de "Film ist." en mettant l'accent sur les récurrences qui traversent l'œuvre (quel que soit le matériau-source qu'elle mobilise), mais aussi en pointant les variations que cette dernière a connues au fil du temps. [less ▲]

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See detailEUTHANASIE ET DEMENCE
Barthélemy, Nicole ULg; DAMAS, François ULg; ALLEPAERTS, Sophie ULg et al

Conference (2013, November 13)

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See detailLes compétences des gestionnaires en économie sociale
Mouchamps, Hugues ULg

Conference given outside the academic context (2013)

Detailed reference viewed: 9 (1 ULg)
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See detailEtude ab-initio d’oxydes antiferroélectriques de structure pérovskite
Amisi, Safari ULg

Doctoral thesis (2013)

In this thesis we present an original ab-initio study of the evolution of antiferrodistortive (AFD), anti-polar electric (APE), and ferroelectric (FE) instabilities in various ABO3 oxides of perovskite ... [more ▼]

In this thesis we present an original ab-initio study of the evolution of antiferrodistortive (AFD), anti-polar electric (APE), and ferroelectric (FE) instabilities in various ABO3 oxides of perovskite structure, as well as their structural and dynamic properties. The main goal is to understand better the microscopic origin of the antiferroelectricity exhibited in these compounds. Three prototypical compounds are studied in detail : PbZrO3 , NaNbO3 , and SrZrO3. After a general introduction on ABO3 compounds, and the ab-initio techniques, we review the concept of antiferroelectricity in perovskites, highlighting some ambiguities in the usual definition and the necessity of turning to what we call a modern definition of antiferroelectricity. First, we highlight that it is the rigidity of the oxygen cage that tends to favor the FE distortion compared to the APE instability. Although illustrated on BaTiO3 , this argument is general, and confirmed by the inspection of the phonons dispersion curves of the ABO3 compounds in whom the strongest instability of the FE/APE branch is systematically at Γ. We show that the emergence of a stable or meta-stable APE distortion appear naturally through a coupling with other instabilities. The presence of AFD modes turns out to be a concrete way to create mixed FE/AFD and APE/AFD phases, crucial for the emergence of antiferroelectricity (AFE). This clarifies why the known AFE compounds systematically include AFD distortions. In this context, since the FE, APE and AFD instabilities are usually in competition, the coexistence of FE, APE and AFD instabilities of strong amplitudes seems required to create mixed phases combining them. This establishes the context convenient to the development of FE and AFE metastable phases close in energy. Another important element concerns the need of a first order AFE-FE transition under electric field producing a double hysteresis loop, typical of AFE compounds. Here also the AFD modes could play a key-role by allowing the emergence of FE/AFD and APE/AFD phases close in energy and developing distinct tilt patterns. These various elements give a new perspective on AFE and allow us to have a more precise idea of the origin of the AFE behavior in perovskites. We identify some key intrinsic characteristics allowing the prediction of materials with the propensity of developing an AFE behavior. [less ▲]

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See detailL'importance stratégique de la Belgique avant la Première Guerre mondiale
Bechet, Christophe ULg

Scientific conference (2013, November 12)

Présentation des principaux résultats de notre thèse à un groupe d'étudiants de master en Histoire

Detailed reference viewed: 41 (2 ULg)
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See detailEcology of mosquitoes (Diptera, Culicidae) potentially vectors of arboviruses according to the kinds of animal husbandry in Belgium
Boukraa, Slimane ULg; De la Grandière de Noronha Cotta, Maria Ana ULg; Bawin, Thomas ULg et al

Poster (2013, November 12)

Human activity, commercial exchanges and climate changes current and future, could favor the (re)-emergence of vector-borne diseases, by inducing changes on Culicidae populations. This study aims to ... [more ▼]

Human activity, commercial exchanges and climate changes current and future, could favor the (re)-emergence of vector-borne diseases, by inducing changes on Culicidae populations. This study aims to determine the potential importance of agricultural environments, especially cattle farms and equestrian, to welcome and favor the proliferation of some species of mosquito responsible for transmission of arboviruses. To better understand the structure of the Culicidae population and identify habitats favorable to the development of each species, a taxonomic inventory was conducted in 2008 (III, VI and X) and 2009 (V and IX) in ten cattle farms, and in 2011 (VI-X) and 2012 (VI-IX) in six equestrian farms located in Belgium. The harvest of mosquitoes is based on adult trapping by CO2-traps (Mosquito magnet) and on larval sampling at the level of 64 biotopes such as water troughs, used tires, abandoned utensils and temporary puddles or not. The morphotaxonomic of larvae and genitalia, and molecular study showed the presence of 15 species: Culiseta annulata Schrank, 1776; Cs. morsitans Theobald, 1901 Anopheles claviger s.s. Meigen, 1804; An. maculipennis s.s. Meigen, 1818; An. messeae Falleroni, 1926; An. plumbeus Stephens, 1828; Culex pipiens molestus Forskal, 1775; Cx. pipiens pipiens L., 1758; Cx. torrentium Martini, 1925; Cx. hortensis hortensis Ficalbi, 1889; Cx. territans Walker, 1856; Coquillettidia richiardii Ficalbi, 1889; Ochlerotatus geniculatus Olivier, 1791; Oc. cantans Meigen, 1818 and Aedes cinereus Meigen, 1818. Among the 57,680 individuals examined, Cx. pipiens s.l., Cx. torrentium and Cs. annulata are the dominants species and ubiquitous in all farms visited. The species of the genus Anopheles have strong ecological requirements and are therefore associated with some special habitats; other species however have a strong ability to adapt and therefore attend a wide variety of biotopes (Cx. pipiens s.l., Cx. torrentium and Cs. annulata). Water troughs, used tires and ponds are the most favorable habitats for larval development of Culicidae. The species potentially vectors of arboviruses that can cause problems in epidemiological farms are Cx. pipiens s.l., Cx. torrentium and Cq. richiardii. Therefore, despite the low diversity of mosquito observed within the livestock environments, they represent a significant risk for the reproduction of some potential vectors of arboviruses. In addition, some larval habitats constitute very favorable sites for proliferation of mosquito, causing a real problem of nuisance for animals of farms. [less ▲]

Detailed reference viewed: 33 (14 ULg)
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See detailContribution to the description of the nitrogen cycle in Lake Kivu
Roland, Fleur ULg; Borges, Alberto ULg; Crowe, Sean et al

Poster (2013, November 12)

Detailed reference viewed: 20 (0 ULg)
See detailLiège au début du XIVe siècle. Une principauté en transitions ?
Masson, Christophe ULg

Scientific conference (2013, November 12)

Detailed reference viewed: 8 (0 ULg)
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See detailSequence Alignment Practical
Bessonov, Kyrylo ULg

Learning material (2013)

Detailed reference viewed: 11 (0 ULg)
See detailLes nouvelles familles: perspectives pour la thérapie familiale
D'Amore, Salvatore ULg

Scientific conference (2013, November 11)

L’émergence des nouvelles familles représente l’un des principaux changements démographiques des sociétés occidentales. Qu’elles soient monoparentales, adoptives, immigrées ou interculturelles, ces ... [more ▼]

L’émergence des nouvelles familles représente l’un des principaux changements démographiques des sociétés occidentales. Qu’elles soient monoparentales, adoptives, immigrées ou interculturelles, ces familles ont longtemps été perçues comme déviantes voire déficitaires par rapport au modèle standard de la famille « traditionnelle ». La souffrance psychique des membres de nouvelles familles semblerait dépendre, entre autres, du croisement de trois processus principaux : transitionnel (gestion du stress et de la souffrance liée à la séparation, divorces, émigrations, coming-out), relationnel (élaboration des pertes par rapport aux précédentes appartenances familiales et mobilisation de ressources pour la création de nouvelles), et sociétal (impact de la stigmatisation, racisme, homophobie, exclusion, manque de reconnaissance juridique et politique). [less ▲]

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Peer Reviewed
See detailSAHBNET, An Accessible Surface-Based Elastic Network to Insert a Protein in a Complex Lipid Membrane
Dony, Nicolas ULg; Crowet, Jean-Marc ULg; Joris, Bernard ULg et al

Conference (2013, November 11)

Study of membrane proteins have become one of the most challenging fields in biology. Solving their structure is one important step toward the understanding of their physiological activity but despite the ... [more ▼]

Study of membrane proteins have become one of the most challenging fields in biology. Solving their structure is one important step toward the understanding of their physiological activity but despite the recent advances in membrane protein crystallization, it represents less than 1 % of the entries in the Protein Data Bank. Therefore, calculation methods to study membrane proteins are helpful to complement experimental studies and fill the gap between the information obtained from the sequence and/or structure, the experimental results and the biological activity. Molecular Dynamics is a method of choice for membrane simulations and the rising of coarse-grained forcefields has opened the way to longer simulations with reduced calculations times. However, these approaches have two main drawbacks, the preparation of complex systems and the preservation of the 3D protein structure, which is not trivial in coarse grained approach. To circumvent these problems, we propose to use a modified version of the Gromacs tool genbox to easily insert lipids and a network based on hydrogen bonds and accessible surface to maintain the protein 3D structure. This protocol is available through a website (gcgs.gembloux.ulg.ac.be). [less ▲]

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Peer Reviewed
See detailDeregulated expression of TANK in glioblastomas triggers pro-tumorigenic ERK1/2 and AKT signaling pathways
Stellzig, J; Chariot, Alain ULg; Shostak, Kateryna ULg et al

in Oncogenesis (2013), e79

Signal transmission by the noncanonical IkappaB kinases (IKKs), TANK-binding kinase 1 (TBK1) and IKKɛ, requires interaction with adapter proteins such as TRAF associated NF-κB activator (TANK). Although ... [more ▼]

Signal transmission by the noncanonical IkappaB kinases (IKKs), TANK-binding kinase 1 (TBK1) and IKKɛ, requires interaction with adapter proteins such as TRAF associated NF-κB activator (TANK). Although increased expression or dysregulation of both kinases has been described for a variety of human cancers, this study shows that deregulated expression of the TANK protein is frequently occurring in glioblastomas (GBMs). The functional relevance of TANK was analyzed in a panel of GBM-derived cell lines and revealed that knockdown of TANK arrests cells in the S-phase and prohibits tumor cell migration. Deregulated TANK expression affects several signaling pathways controlling cell proliferation and the inflammatory response. Interference with stoichiometrically assembled signaling complexes by overexpression or silencing of TANK prevented constitutive interferon-regulatory factor 3 (IRF3) phosphorylation. Knockdown of TANK frequently prevents constitutive activation of extracellular signal-regulated kinases 1 and 2 (ERK1/2). TANK-mediated ERK1/2 activation is independent from the canonical MAP kinase or ERK kinase (MEK) 1/2-mediated pathway and utilizes an alternative pathway that uses a TBK1/IKKɛ/Akt signaling axis, thus identifying a novel pathway suitable to block constitutive ERK1/2 activity. [less ▲]

Detailed reference viewed: 2 (1 ULg)