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

Conference given outside the academic context (2013)

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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

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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 ▲]

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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)

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See detailLiège au début du XIVe siècle. Une principauté en transitions ?
Masson, Christophe ULg

Scientific conference (2013, November 12)

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See detailSequence Alignment Practical
Bessonov, Kyrylo ULg

Learning material (2013)

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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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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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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 ▲]

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See detailLa presse régionale en déclin ?
Geuens, Geoffrey ULg

Conference given outside the academic context (2013)

Detailed reference viewed: 11 (4 ULg)
Peer Reviewed
See detailInfinite Depth: du Movie Ride à la 3D relief, l'expérience de la profondeur.
Thonon, Jonathan ULg

Conference (2013, November 10)

Detailed reference viewed: 12 (1 ULg)
Peer Reviewed
See detailM.G. Vassanji’s A Place Within: Thinking through India, Transnationally
Munos, Delphine ULg

Conference (2013, November 10)

In their groundbreaking collection, Minor Transnationalism, Françoise Lionnet and Shu-mei Shih advocate a new approach to transnationalism, which, by shifting the ground of analysis to “transversal” ... [more ▼]

In their groundbreaking collection, Minor Transnationalism, Françoise Lionnet and Shu-mei Shih advocate a new approach to transnationalism, which, by shifting the ground of analysis to “transversal” movements of culture, departs from existing theoretical frameworks and allows for the emergence of “minor-to-minor networks” (8) that have the potential to circumvent the major altogether. Lionnet’s and Shih’s understanding of transnationalism not in terms of vertical relations between center and margin, but in terms of cultural transversalism, is particularly apt in the context of MG Vassanji’s writings, notably because his books often complicate those hackneyed notions of hybridity constructing Western locales as the privileged sites of plurality. In this paper, my contention is that Lionnet’s and Shih’s concept of ‘minor transnationalism’ also proves useful to deconstruct the discourse of ‘dominant’ Western-based diasporas that style themselves as “the legitimate archive with which to explore diasporic subjectivities” (Vijay Mishra, 3) — such as the hyper-visible ‘new’ Indian diaspora of global capital. Taking its cue from Lionnet’s and Shih’s concept of minor transnationalism, this paper looks at A Place Within (2008), the memoir of Vassanji’s travels across the land of his ancestors over two decades, with a view to showing how the author’s positionality as a ‘minor’ transnational (i.e. as a Canadian writer of Indian descent born on East-African soil) gives a new twist to the now-classic ‘return to the Indian homeland’ narrative — a staple, indeed, of the enormously popular Indian diasporic literature. At stake is the contention that Vassanji’s own brand of ‘minor transnationalism’ allows for a unique descent into the messiness of India, the ‘slippery’ nature of its past — well beyond diaspora’s dubious politics of retrieval and its investment in purist readings of the Indian homeland [less ▲]

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See detailTransient middle cerebral artery occlusion prevents habit formation in C57Bl/6J mice
Linden, Jérôme ULg; Plumier, Jean-Christophe ULg; Ferrara, André ULg et al

Poster (2013, November 10)

Pathologies affecting the striatum (e.g., Parkinson’s and Huntington’s disease) can result in impaired habit learning abilities. Likewise, such impairments have also been observed after stroke affecting ... [more ▼]

Pathologies affecting the striatum (e.g., Parkinson’s and Huntington’s disease) can result in impaired habit learning abilities. Likewise, such impairments have also been observed after stroke affecting the middle cerebral artery territory (encompassing the striatum). However, habit learning has never been investigated in animal stroke models, for which it could be a reliable measure of cognitive deficits. We thus assessed the ability to learn a habitual sequence of lever-presses using operant conditioning in mice after MCAO, one of the most common stroke models. C57Bl/6J mice underwent MCAO or sham surgery. Sensorimotor functioning was assessed using the vertical pole test, rotarod and amphetamine-induced rotation test. Habit learning was evaluated using the operant serial order learning (SOL) task: mice had to perform a series of two consecutive lever-presses (i.e., left then right) to obtain a food reward. Lesion extents were finally determined using anti-NeuN immunohistochemistry. MCAO mice were significantly impaired in both the rotarod and vertical pole test, and displayed a significantly greater number of ipsilateral rotations after amphetamine administration. In the operant SOL task, MCAO committed more errors than sham; moreover, they did not show any significant increase in performance along the sessions. Histological analysis showed consistent striatal and cortical infarctions. The lack of habit learning ability in MCAO mice is congruent with both the literature investigating the effect of striatal lesion in animals and the symptomatology observed in human stroke patients. Habit learning could thus be regarded as a reliable measure of functional outcome after MCAO, in combination with test assessing sensory and motor aspects. [less ▲]

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