References of "Scientific congresses and symposiums"
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See detailDynamical thermalization in Bose-Hubbard systems
Schlagheck, Peter ULg; Shepelyansky, Dima L.

Conference (2016, March)

A bosonic many-body system can exhibit the Bose-Einstein distribution in its single-particle eigenstates not only if it is coupled to a heat and particle reservoir, but also if it is subject to a two-body ... [more ▼]

A bosonic many-body system can exhibit the Bose-Einstein distribution in its single-particle eigenstates not only if it is coupled to a heat and particle reservoir, but also if it is subject to a two-body interaction of moderately low strength which couples the single-particle eigenstates with each other. We numerically verify this dynamical thermalization conjecture within disordered Bose-Hubbard rings of finite size whose parameters are chosen such that the dynamics of the system can be expected to be ergodic [1]. This allows one to associate with each many-body eigenstate of the Bose-Hubbard system well-defined (positive or negative) values for the effective temperature and the effective chemical potential which depend on the energy per particle of the eigenstate under consideration [1]. With this information one can then predict the populations of single-particle eigenmodes within each many-body eigenstate of the system according to the Bose-Einstein distribution, without knowing more details about the quantum dynamics of the many-body system. [less ▲]

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See detailReturn words and factor complexity
Leroy, Julien ULg

Conference (2016, March)

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See detailDevelopment of a translation stage for in situ non-invasive analysis and high resolution imaging
Strivay, David ULg; Clar, Mathieu ULg; Rakkaa, Saïd ULg et al

Poster (2016, March)

Non-invasive imaging techniques and analytical instrumentation for cultural heritage object studies have undergone a tremendous development over the last years. Many new miniature and/or handheld systems ... [more ▼]

Non-invasive imaging techniques and analytical instrumentation for cultural heritage object studies have undergone a tremendous development over the last years. Many new miniature and/or handheld systems have been developed and optimized. Nonetheless, these instruments are usually used with a tripod or a manual position system. This is very time consuming when performing point analysis or 2D scanning of a surface. The Centre Européen d’Archéométrie (CEA) has build a translation system made of pluggable rails of 1 m long with a maximum length and height of 3 m. Three motors embedded in the system allow the platform to be moved along these axis, toward and backward from the sample. The rails hold a displacement system, providing a continuous movement. Any position can be reached with a reproducibility of 0.1 mm. The displacements are controlled by an Ethernet connection through a laptop computer running a multiplatform homemade software written in JAVA. This software allows a complete control over the positioning using a simple, unique, and concise interface. Automatic scanning can be performed over a large surface of 3 meters on 3 meters. The Ethernet wires provide also the power for the different motors and, if necessary the detection head. The platform has been originally designed for a XRF detection head (with its full power alimentation) but now can accommodate many different systems like IR reflectography, digital camera, hyperspectral camera, Raman probes, etc. The positioning system can be modified to combine the acquisition software of the imaging or analytical techniques and the positioning software. [less ▲]

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See detailBad News in Service Encounters: Ideas and Insights
Delcourt, Cécile ULg; Gremler, Dwayne

Conference (2016, March)

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See detailMobiliser la culture du pays d’origine, un défi pour l’intégration des migrants?
Mescoli, Elsa ULg; Gsir, Sonia ULg

Conference (2016, March)

La culture constitue pour les migrants et leurs pays d’origine un moyen de maintenir des liens réciproques après la migration. Mais quels sont les enjeux de la mobilisation de la culture d’origine pour ... [more ▼]

La culture constitue pour les migrants et leurs pays d’origine un moyen de maintenir des liens réciproques après la migration. Mais quels sont les enjeux de la mobilisation de la culture d’origine pour l’intégration des migrants dans leurs nouveaux pays de résidence ? Cette présentation analyse le déploiement de la culture du pays d’origine à trois niveaux : celui des pratiques quotidiennes des migrants, des politiques d’intégration et de diaspora et enfin, le niveau des associations, en particulier les centres culturels établis en Europe par les pays d’origine des migrants. Les pratiques culturelles des migrants et les actions et institutions culturelles mises en place par les pays d’origine sont confrontées au cadre légal européen en matière de diversité culturelle mais aussi aux politiques et discours sur l’intégration des migrants. La perspective à la fois anthropologique et sociologique adoptée révèle les processus de domination culturelle qui sont à l’œuvre. Elle permet aussi de questionner l’idée d’identité culturelle en montrant le dynamisme qui caractérise les cultures mais aussi la créativité des communautés locales dans un environnement globalisé. Finalement, on constate qu’une variété de facteurs est en jeu dans les processus d’intégration des migrants, que les dynamiques de la culture elle-même déterminent des appartenances multiples et aussi que les identités se développent au sein des interactions entre cultures. Si on ne peut établir de lien causal et univoque entre les pratiques culturelles liées au pays d’origine et l’intégration des migrants dans le pays de résidence, on peut par contre se référer à la notion d’ethnicité et à sa fonction politique (Comaroff et Comaroff, 2009). [less ▲]

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See detailEstetrols’ Potential for Neuroprotection Following the injury to the Developing Brain: Preclinical Studies
Tskitishvili, Ekaterine ULg; Nisolle, Michelle ULg; Noël, Agnès ULg et al

in The 17th World Congress of Gynecological Endocrinology, Florence 2-5 March 2016 (2016, March)

Context: Hypoxic-Ischemic encephalopathy (HIE) remains a major cause of perinatal brain injury. The brain rapidly increases in size, shape and complexity during the second and third trimesters. A sentinel ... [more ▼]

Context: Hypoxic-Ischemic encephalopathy (HIE) remains a major cause of perinatal brain injury. The brain rapidly increases in size, shape and complexity during the second and third trimesters. A sentinel event in late pregnancy or the intrapartum period may have an acute profound effect on a previously neurologically intact fetus, leading to the development of (HIE). The nature of the deficits is dependent on the gestational age and severity of the insult, though it is seldom reported in preterm infants. Studies in animal models of HIE may provide important information for the development of treatment for this pathological condition. Estetrol (E4) is a recently described estrogen with four hydroxyl-groups that is synthesized exclusively during pregnancy by the human fetal liver. Objective: In this study, we evaluated E4’s neuroprotective and therapeutic potency in neonatal (in vivo) HIE model of the immature 7-day-old newborn rat. Methods: Rat pups body temperatures were examined along with their body and brain weights. Brains were studied at the level of the hippocampus and cortex. Intact cell counting and expressions of markers for neuronal early grey matter damage (microtubule-associated protein-2 (MAP-2)), neurogenesis (doublecortin (DCX)) and angiogenesis (vascular-endothelial growth factor (VEGF)) were evaluated by histo- and immunohistochemistry. The serum levels of two markers of brain damage (S100B and glial fibrillary acidic protein (GFAP)) were measured by ELISA. Results: Our results demonstrate that E4 has a significant neuroprotective and therapeutic effects. Estetrol decreases the early gray matter loss, and promotes neuro- and angiogenesis in vivo. Estetrol treatment has no effects on body weight, brain weight or body temperature. Conclusion: Taken together, E4 might become an important safe and physiological substance to treat neonatal HIE. [less ▲]

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See detailThe bottom up innovation and entrepreneurship in smart cities, case of Indian cities
Kummitha, Rama; Crutzen, Nathalie ULg

Conference (2016, March)

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See detailNovel composite heterozygous mutation of the receptor for hCG and LH leading to male disorder of sexual development
Potorac, Iulia ULg; FUDVOYE, Julie ULg; GAILLEZ, Stephanie ULg et al

in Abstract book - 17th World Congress of Gynecological Endocrinology (2016, March)

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See detailA "external" StandPoint on QMS
Massart, Sébastien ULg

Conference (2016, March)

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See detailAntihyperglycémiants, antihypertenseurs et hypolipidémiants : comparaison des effets sur la mortalité et la morbidité cardiovasculaire chez le patient diabétique de type 2
SCHEEN, André ULg

Poster (2016, March)

Introduction : Réduire le risque de mortalité et morbidité cardiovasculaire (CV) chez le patient diabétique de type 2 (DT2) est primordial, mais les effets protecteurs semblent différents selon le mode ... [more ▼]

Introduction : Réduire le risque de mortalité et morbidité cardiovasculaire (CV) chez le patient diabétique de type 2 (DT2) est primordial, mais les effets protecteurs semblent différents selon le mode d’intervention pharmacologique étudié. Patients et méthodes : Les données de mortalité (totale et CV) et morbidité (infarctus du myocarde ou IDM, accidents vasculaires cérébraux ou AVC) rapportées (réduction du risque relatif) dans les essais ayant testé un traitement anti-hyperglycémiant sont comparées avec les résultats publiés dans deux méta-analyses concernant les hypolipidémiants et les anti-hypertenseurs consacrées au DT2. Résultats : Les antihypertenseurs réduisent les IDM (-12%) et la mortalité globale (-13%) de façon comparable, et diminuent davantage les AVC (-27%). Les hypolipidémiants diminuent davantage les IDM (- 22%) et les AVC (-21%) que la mortalité globale (-9%) (ou la mortalité CV : - 13%). Les données concernant les antihyperglycémiants diffèrent considérablement selon les médications testées. L’insuline et les sulfamides (UKPDS) réduisent plus les IDM (- 21%) que la mortalité totale (-8%), mais augmentent les AVC (+ 14%). La metformine (UKPDS) réduit, de façon comparable, les IDM (-39%), les AVC (-41%) et la mortalité totale (-36%). La pioglitazone (PROactive) diminue davantage les IDM (-17%) et les AVC (-19%) que la mortalité (-4%). Les gliptines (combinaison de SAVOR TIMI 53, EXAMINE, TECOS) ont montré des effets globalement neutres sur la mortalité totale (0%), les IDM (-2%) et les AVC (-1%). L’empagliflozine (EMPA-REG OUTCOME) se singularise par un effet favorable nettement plus marqué sur la mortalité totale (-32 %) et CV (- 38%) que sur les IDM (-13%) ou les AVC (+18%). Conclusion : Les discordances observées suggèrent l’implication de mécanismes protecteurs différents selon les interventions testées. EMPA-REG OUTCOME, le seul essai démontrant un effet plus marqué sur la mortalité que sur les événements CV, suggère un mécanisme propre de l’inhibiteur des SGLT2. [less ▲]

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See detailTheoretical study of the organocatalyzed synthesis of NIPUs
Alves, Margot ULg; Méreau, Raphaël; Grignard, Bruno ULg et al

Poster (2016, March)

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See detailAzacytidine Enhances Regulatory T-Cells In Vivo and Prevents Experimental Xenogeneic Graft-Versus-Host Disease
Ehx, Grégory ULg; Fransolet, Gilles ULg; de Leval, Laurence ULg et al

in Biology of Blood and Marrow Transplantation (2016, March), 22(3), 393

Background. The demethylating agent 5-azacytidine (AZA) has proven its efficacy as treatment for myelodysplastic syndrome and acute myeloid leukemia. In addition, AZA can demethylate FOXP3 intron 1 ... [more ▼]

Background. The demethylating agent 5-azacytidine (AZA) has proven its efficacy as treatment for myelodysplastic syndrome and acute myeloid leukemia. In addition, AZA can demethylate FOXP3 intron 1 (FOXP3i1) leading to the generation of regulatory T cells (Tregs). Objective. We investigated the impact of AZA on xenogeneic graft-versus-host disease (xGVHD) in a humanized murine model of transplantation, and described the impact of the drug on human T cells in vivo. Methods. In order to induce xGVHD, human peripheral blood mononuclear cells (huPBMC) were administered intravenously in NOD-scid IL-2Rγnull (NSG) mice. Results. AZA successfully improved both survival (p<0.0001) and xGVHD scores (p<0.0001). Further, AZA significantly decreased human T-cell proliferation as well as INF-γ and TNF-α serum levels, and reduced the expression of GRANZYME B and PERFORIN 1 by cytotoxic T cells. In addition, AZA administration significantly increased the function, proliferation and frequency of Tregs through demethylation of FOXP3i1 and higher secretion of IL-2 by conventional T cells due to IL2 gene promoter site 1 demethylation. Interestingly, among AZA-treated mice surviving the acute phase of xGVHD, there was an inverse correlation between the presence of Tregs and signs of chronic GVHD. Finally, Tregs harvested from the spleen of AZA-treated mice were suppressive and stable over time since they persisted at high frequency in secondary transplant experiments. Conclusion. These findings emphasize a potential role for AZA as prevention or treatment of GVHD and other autoimmune diseases. [less ▲]

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See detailAn ensemble of projections of wheat adaptation to climate change in europe analyzed with impact response surfaces
Ruiz-Ramos, M.; Ferrise, R.; Rodríguez, A. et al

Conference (2016, March)

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See detailDes pratiques enseignantes qui font obstacle au rôle des modèles dans la construction des savoirs scientifiques
Dontaine, Matthieu; Heins, Pascal ULg; Hindryckx, Marie-Noëlle ULg et al

Conference (2016, March)

Dans une perspective comparatiste, des didacticiens de plusieurs disciplines (biologie, chimie, histoire de l’art, mathématique et physique) ont étudié des pratiques enseignantes faisant obstacle au rôle ... [more ▼]

Dans une perspective comparatiste, des didacticiens de plusieurs disciplines (biologie, chimie, histoire de l’art, mathématique et physique) ont étudié des pratiques enseignantes faisant obstacle au rôle des modèles dans la construction des savoirs scientifiques. Leur réflexion croisée les a amenés à considérer des niveaux élevés de l’échelle de codétermination didactique de Chevallard (2012) pour identifier des indicateurs d’une certaine forme de positivisme empirique dans l’épistémologie spontanée des enseignants. Cette posture s’exprime plus ou moins différemment d’une discipline à l’autre mais le fait que les modèles et théories enseignées ont fait ou non l’objet d’une standardisation au sein de communautés scientifiques savantes déterminent fortement leur transposition didactique. De ce point de vue, l’exemple de l’histoire de l’art a joué un rôle méthodologique important permettant de contraster et de questionner les pratiques dans les autres disciplines. Ce questionnement s’inscrit dans un objectif à plus long terme qui est la reproblématisation (au sens de Orange, 2005) d’enseignements relatifs aux disciplines enseignées. [less ▲]

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See detailLe sensible chez Franz Brentano
Gauvry, Charlotte ULg

Conference (2016, March)

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See detailA novel protocol for the design of artificial (β/α)8-barrel proteins
Martina, Cristina ULg; Figueroa Yévenes, Maximiliano ULg; Combs, Steven et al

Poster (2016, March)

Designing de novo proteins of more than 100 amino acids is still challenging. The creation of artificial (β/α)8-barrel proteins had only one successful example in literature, thank to use of internal ... [more ▼]

Designing de novo proteins of more than 100 amino acids is still challenging. The creation of artificial (β/α)8-barrel proteins had only one successful example in literature, thank to use of internal spatial symmetry. Here we present a protocol to design de novo (β/α)8-barrel proteins without symmetry restriction. First, the backbone was created in 4 steps: (I) Rosetta ParametricDesign produced an highly symmetric polyalanine scaffold with no loops; (II) Rosetta Fixed-Backbone Design used the previous output to substitute the alanines in all the position; (III) Loops were constructed with Modeller joining the terminus of the secondary structure elements and (IV) RosettaRelax performed relaxation, creating around 4000 different models. 28 backbone models were selected for the next steps of sequence design. To design the final proteins for experimental validation, 10 cycles of Rosetta Design and Relax were performed. In the first cycle only apolar amino acids were allowed in hydrophobic regions; in the next 6 cycles, amino acids were allowed based on the definition of 3 regions: core, boundaries and surface. All the amino acids were allowed in each position in the last 3 cycles. More than 10000 different sequences were created and analyzed in term of amino acid composition, sequence similarity with natural protein, secondary structure prediction, and molecular dynamics simulations. The 30 best candidate sequences have been selected for experimental verification. [less ▲]

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See detail“Color is a kind of holy substance for me”: analytical study of the Sam Francis’ palette from the 1940’s to the 1990’s
Defeyt, Catherine ULg; Mazurek, Joy; Zebala, Aneta et al

Poster (2016, March)

The Sam Francis’s colors, literally described as vivid, saturated, pure, vibrant intense and rich, largely contribute to the unique character of his work. This idiosyncrasy explains the interest in ... [more ▼]

The Sam Francis’s colors, literally described as vivid, saturated, pure, vibrant intense and rich, largely contribute to the unique character of his work. This idiosyncrasy explains the interest in conducting an extended study on the Francis’ painting materials through analytical techniques. On the other hand, many Francis’ paintings display colored surfaces that exhibit bronzing, fluorescent or opalescent effects. As a consequence, retouching paint losses from Sam Francis works may become a challenging task for the involved conservators, the degree of the color matching required in the imitative technique being particularly difficult to attain, in the presence of such surfaces. Furthermore, the attained degree of the color match has to be conserved in all conditions of illumination and observation. The use of pigments chemically similar to the original ones is often necessary for matching highly chromatic pigments. Though, many modern synthetic organic pigments (SOPs) possess high color strength. That is why the characterization of the Francis palette would provide helpful information to the conservators, which have to deal with this type of issue. The upcoming Getty publication Sam Francis: The Artist’s Materials, planned for 2016, offered the opportunity for in-depth analyses of hundreds paint samples. Almost three hundreds of paint fragments supplied by the Sam Francis Foundation have been investigated at the GCI laboratory, by using three complementary analytical techniques, Py-GC-MS, Raman and FTIR spectroscopies. The Raman spectroscopy is one of the most efficient techniques for identifying SOPs in paint systems, while the Py-GC-MS and FTIR methods provide essential information concerning the binding media. The analyzed paint fragments were sampled from twenty-nine canvases and works on paper, made between 1946 and 1992. Although, primary established in Southern California, Sam Francis spent numerous long journeys in different places around the world, including Paris, Bern, Mexico City, New York and Tokyo. However, the material study has outlined the uninterrupted use of` certain classes of SOPs in specific colors. For example, copper phthalocyanine (CuPc) pigments were systematically detected in the blue and green samples, while azo pigments have been identified in most of the yellow areas sampled from post 1940s works. Regardless of the support and the paint technique, the Francis’ blues primary contain Ultramarine and/or CuPc blue pigments. And, it has been shown that the bronzing blue surfaces noticed for some of the investigated artworks correspond to PB15-based paint films. The present study has also underlined the recurrent use of perinone orange and dioxazine violet in fluorescent orange and purple area. Despite the early introduction of SOPs, on the Francis’ palette, the works dating from the 1940’s remained mainly composed of traditional inorganic pigments, for instance lead white and red, chrome yellow, viridian and iron oxides. Interestingly, various binding media, i.e. Shellac gum, modified and unmodified oils, PVA, alkyd resins and acrylic copolymers have been identified. Actually, the investigated samples have pointed out the frequent combination of more than three types of binders on a same painting. Through the identification of the various SOPs used by Francis over fifty years, this research provide helpful information for selecting the most appropriate retouching pigments. [less ▲]

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See detailDes pratiques enseignantes qui font obstacle au rôle des modèles dans la construction des savoirs scientifiques. 2. Le cas de la discipline scolaire "histoire de l'art"
Heins, Pascal ULg

Conference (2016, March)

Dans une perspective comparatiste, des didacticiens de plusieurs disciplines (mathématiques, physique, chimie, biologie, histoire de l’art) ont étudié des pratiques enseignantes faisant obstacle au rôle ... [more ▼]

Dans une perspective comparatiste, des didacticiens de plusieurs disciplines (mathématiques, physique, chimie, biologie, histoire de l’art) ont étudié des pratiques enseignantes faisant obstacle au rôle des modèles dans la construction des savoirs scientifiques. Leur réflexion croisée les a amenés à considérer des niveaux élevés de l’échelle de co-détermination didactique de Chevallard (2012) pour identifier des indicateurs d’une certaine forme de positivisme empirique dans l’épistémologie spontanée des enseignants. Cette posture s’exprime plus ou moins différemment d’une discipline à l’autre, mais le fait que les modèles et théories enseignées ont fait ou non l’objet d’une standardisation au sein de communautés scientifiques savantes déterminent fortement leur transposition didactique. De ce point de vue, l’exemple de l’histoire de l’art a joué un rôle méthodologique important permettant de contraster et de questionner les pratiques dans les autres disciplines. Ce questionnement s’inscrit dans un objectif à plus long terme qui est la reproblématisation (au sens de Orange, 2005) d’enseignements relatifs aux disciplines enseignées. [less ▲]

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See detailDouble genetic defect in a case of congenital hypogonadotropic hypogonadism
Potorac, Iulia ULg; Pintiaux, Axelle ULg; VALDES SOCIN, Hernan Gonzalo ULg et al

in Abstract book - 17th World Congress of Gynecological Endocrinology (2016, March)

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See detailCertificat successoral européen Aperçu et mise en oeuvre
Wautelet, Patrick ULg

Conference (2016, March)

Cette présentation a pour objectif de donner un aperçu général du fonctionnement du certificat successoral européen mis en place par le Règlement successions

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See detailImproving laboratory diagnostic efficiency of epizootic diseases in Belgium
Cargnel, Mickaël ULg; Roelandt, Sophie; Van der Stede, Yves et al

Poster (2016, March)

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See detailNewborn screening for sickle cell disease : 13 years at the CHR "La Citadelle", Liège
Sepulchre, Edith; Ketelslegers, Olivier; Minon, Jean-Marc et al

in Tijdschrift van de Belgische Kinderarts = Journal du Pédiatre Belge (2016, March), 18(1), 107

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See detailRelations entre neuropathie autonome cardiaque (NAC), pression pulsée (PP) et insuffisance rénale chronique (IRC) chez le patient diabétique de type 2 (DT2)
PHILIPS, Jean-Christophe ULg; MARCHAND, Monique ULg; SCHEEN, André ULg

Poster (2016, March)

Objectifs : Ce travail étudie les relations entre trois complications diabétiques, la NAC, l’élévation de PP (marqueur de rigidité artérielle) et la diminution du débit de filtration glomérulaire (DFG ... [more ▼]

Objectifs : Ce travail étudie les relations entre trois complications diabétiques, la NAC, l’élévation de PP (marqueur de rigidité artérielle) et la diminution du débit de filtration glomérulaire (DFG) chez le patient DT2. Patients et méthodes : L’étude comprend 79 patients DT2 (53H/26F; 56±8 années; 11±8 années de DT2; IMC 28,4±4,6 kg/m²) analysés par enregistrement continu de la pression artérielle (PA) et de la fréquence cardiaque (appareil Finapres) lors d’un test postural standardisé. Le gain baro-réflexe (GBR, indice de NAC) correspond à la pente de la relation entre les espaces R-R et PA systolique (PAS) lors du redressement accroupi-debout. PP est analysée pendant tout le test et par son augmentation durant l’accroupissement (delta PP). DFG est estimé par la formule MDRD au début puis après un suivi moyen de 12±5 ans. Résultats : Les valeurs initiales sont : HbA1c : 8,8± 1,7%; DFG : 86±25 ml/min ; PP : 62±10 mmHg; BRG : 1,8±1,4 msec/mmHg. DFG est inversement corrélé à l’âge (r=-0,317; p=0,020), très positivement corrélé avec GBR (r=0,453; p=0,008), sans corrélation significative avec HbA1c (r=-0,023; p=0,935) ni avec PAS, PP ou encore delta PP (r=-0,206; p=0,114; NS). La diminution de DFG (-12±23 ml/min) lors du suivi de 12 ans n’a pu être corrélée de façon significative aux valeurs initiales et finales d’HbA1c, ni aux valeurs initiales de GBR (et d’autres marqueurs de NAC) ou de PA, même si la relation est proche de la signification pour delta PP (r=0,20; p=0,060). Conclusion : La forte relation initiale entre DFG et GBR suggère que IRC et NAC sont aggravées de façon conjointe et, possiblement, qu’une des deux complications influence l’autre. L’absence de toute corrélation entre la chute ultérieure de DFG et les autres paramètres initiaux peut s’expliquer par l’origine multifactorielle de la progression de l’IRC chez le patient DT2. [less ▲]

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See detailGalectin-1 is involved in osteoclast biology
Muller, Joséphine ULg; Binsfeld, Marilène ULg; DUBOIS, Sophie ULg et al

Poster (2016, February 28)

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See detailEDUCATION RACHIDIENNE : DE L’ENFANT AU SPORTIF DE HAUT NIVEAU
Vanderthommen, Marc ULg; GROSDENT, Stéphanie ULg; Fettweis, Tatiana ULg et al

in Livre des Résumés du 2ème Colloque Guy Namurois (2016, February 27)

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See detailIntérêt d’un modèle de compétition adapté aux enfants en athlétisme : le Kid’s Athletics
Jidovtseff, Boris ULg; Wuillaume, Sandrine; Cloes, Marc ULg

Poster (2016, February 27)

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See detailMesure de l’efficacité d’un protocole d’entraînement sur l’amélioration de la vitesse chez des joueurs de football
Lombard, Gilles ULg; Clerc, Etienne

Poster (2016, February 27)

Introduction L’organisation défensive des équipes de football et la densité des joueurs ont significativement augmenté depuis 40 ans (Wallace et Norton, 2014). Ceci influence les qualités physiques des ... [more ▼]

Introduction L’organisation défensive des équipes de football et la densité des joueurs ont significativement augmenté depuis 40 ans (Wallace et Norton, 2014). Ceci influence les qualités physiques des joueurs qui se doivent d’être plus rapides pour faire la différence. Aujourd’hui, la filière anaérobie alactique, bien que minoritaire au niveau quantitatif (Mohr et al., 2003), est la déterminante principale de la performance sur le plan physique (Cometti et al., 2001). Etant donné l’importance de cette qualité physique, nous avons voulu examiner si l’introduction d’un travail spécifique de la vitesse durant 8 semaines aurait un impact significatif sur la performance fonctionnelle du joueur de football. Méthodologie L’échantillon de 18 joueurs est réparti dans des groupes contrôle et expérimental. Trois tests de terrain sont utilisés pour mesurer l’évolution du paramètre anaérobique avant et après le protocole de 8 semaines : un test de vitesse sur 10 mètres (Wilson et al., 1993), un test de zigzags sur 20 mètres (Little et Williams, 2005) et un counter movement jump avec les bras (Slinde et al., 2008). Durant 8 semaines, le groupe expérimental bénéficie, en plus de l’entraînement normal, de deux séances hebdomadaire de 30 minutes visant le développement de la vitesse. Resultats L’étude étant toujours en cours, nous ne disposons pas encore de résultats. Nous espérons observer une amélioration significative des performances dans les trois tests grâce à l’amélioration, entre autre, de la vitesse gestuelle et de la force spécifique des appuis (Cometti, 2006). Néanmoins, nous nous attendons à ce que l’amélioration soit plus importante au niveau des tests zigzags et counter movement jump de par l’influence importante des masses musculaires et l’impact réduit du temps de réaction par rapport au sprint sur 10 mètres. Conclusion Nous espérons que ce protocole se révélera efficace dans l’amélioration des performances car il serait intéressant de disposer d’un outil améliorant les qualités de vitesse des joueurs dans une période de temps assez courte pour ne pas empiéter sur l’entraînement technico-tactique. [less ▲]

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See detailSPÉCIALISATION SPORTIVE PRÉCOCE : QUEL IMPACT SUR LA PERFORMANCE, SUR LE DÉVELOPPEMENT ET SUR LA SANTÉ ET QUELLES PISTES DE SOLUTION ?
Jidovtseff, Boris ULg

in Jidovtseff; Halleux, Philippe; Lambert, Eric (Eds.) Livre des résumés du 2ème colloque Guuy Namurois (de l'éducation physique à la performance sportive) (2016, February 27)

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See detailL’ACCOUTUMANCE À L’EAU, UN PASSAGE OBLIGÉ AVANT LA NATATION ?
Mornard, Manhattan ULg; Delvaux, Anne ULg; Delsupexhe, Nadège et al

Poster (2016, February 27)

Detailed reference viewed: 21 (6 ULg)
See detailNitrous oxide dynamics in sea ice
Kotovitch, Marie ULg; Fripiat, François ULg; Moreau, Sébastien et al

Conference (2016, February 26)

Fluctuations in greenhouse gases (GHGs) concentration alter the energetic budget of the climate system. There is high confidence that natural systems related to snow, ice and frozen ground (including ... [more ▼]

Fluctuations in greenhouse gases (GHGs) concentration alter the energetic budget of the climate system. There is high confidence that natural systems related to snow, ice and frozen ground (including permafrost) are affected. Nitrous oxide (N2O) is one of the potent GHG naturally present in the atmosphere, but witch has seen his concentration growing since industrial era. N2O has a lifetime in the atmosphere of 114 years and a global warming potential (GWP) of 298 to be compared to carbon dioxide that has a GWP of 1. N2O is also describe as the dominant ozone-depleting substance emitted in the 21st Century. Yet, there are still large uncertainties and gaps in the understanding of the cycle of this compound through the ocean and particularly in sea ice. Sources and sinks of N2O are therefore still poorly quantified. The main processes (with the exception of transport processes) involved in the N2O cycle within the aquatic environment are nitrification and denitrification. To date, only one study by Randall et al. present N2O measurements in sea ice. Randall et al. pointed out that sea ice formation and melt has the potential to generate sea-air or air-sea fluxes of N2O, respectively. [less ▲]

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See detailAnnual dynamics of pCO2 within bulk sea ice and related CO2 fluxes at Cape Evans (Antarctica)
Van Der Linden, Fanny ULg; Champenois, Willy ULg; Heinesch, Bernard ULg et al

Poster (2016, February 26)

Sea ice is a biome actively participating in the regional cycling of CO2 as both a source and a sink at different times of the year. In the frame of the YROSIAE project (Year-Round Ocean-Sea-Ice ... [more ▼]

Sea ice is a biome actively participating in the regional cycling of CO2 as both a source and a sink at different times of the year. In the frame of the YROSIAE project (Year-Round Ocean-Sea-Ice-Atmosphere Exchanges), annual dynamics of sea ice pCO2 was compared with CO2 fluxes measured by automated accumulation chambers at Cape Evans (Ross Island, Antarctica). Results confirmed a general trend of brine pCO2 supersaturation with respect to the atmosphere during the late winter (concentration of dissolved inorganic carbon - DIC - in brine and brine expulsion in the brine skim) leading to CO2 degassing, and undersaturation during the spring (carbon-uptake by autotrophs and brine dilution) leading to atmospheric CO2 uptake. Despite high primary production at the bottom of the ice in spring, DIC profiles suggest that sea ice as a whole appears to be net heterotrophic. Still, sea ice absorbs CO2 from the atmosphere, as a result of physical processes. Some variability in the CO2 fluxes (both in magnitude and sign) could not be explained by variability in sea ice pCO2 but rather seemed driven by variability in atmospheric conditions and sea ice surface properties. For instance, in late spring, CO2 fluxes showed a diurnal variability (from CO2 degassing to uptake) related to atmospheric temperature variations. Large and episodic CO2 fluxes were systematically positively correlated with strong wind events, and large CO2 degassing was observed over thin, wet and salty snow cover. [less ▲]

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Peer Reviewed
See detailUn manuscrit de l’entourage de Noël Bellemare sous le microscope : analyse du ms. W 29 de l’Université de Liège
Oger, Cécile ULg; L'Estrange, Elizabeth; Gilbert, Bernard ULg et al

Conference (2016, February 26)

Detailed reference viewed: 23 (0 ULg)
See detailDes modèles héroïques et bibliques pour François Ier. Le cas d’Hercule
Laruelle, Anne-Sophie ULg

Conference (2016, February 25)

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See detailL’enseignement de l’éducation physique en Belgique francophone : une lente transition vers la littératie physique et un ancrage sociétal
Cloes, Marc ULg

Conference (2016, February 25)

A la fin des années 90’, les autorités en charge de l’Education dans l’actuelle Fédération Wallonie-Bruxelles ont attribué à l’éducation physique la mission de développer trois domaines de compétences ... [more ▼]

A la fin des années 90’, les autorités en charge de l’Education dans l’actuelle Fédération Wallonie-Bruxelles ont attribué à l’éducation physique la mission de développer trois domaines de compétences (condition physique, habiletés gestuelles, coopération socio-motrice) pour poursuivre en parallèle quatre finalités (santé, sécurité, expression-communication, éducation sportive). Si les textes officiels semblaient encourager le développement d’un cours d’éducation physique où le sport cédait un peu de terrain à l’activité physique au sens large, force est de constater que, dans les faits, les séances sont restées essentiellement construites par rapport à la pratique de disciplines sportives (dont le choix tend par ailleurs à s’élargir et à se diversifier). Depuis quelques années, sous l’impulsion des formateurs d’enseignants, on constate toutefois une modification très progressive des mentalités. De plus en plus d’initiatives sont ainsi mises en place sur le terrain dans la perspective d’amener les élèves à devenir des citoyens responsables … de leur corps tout au long de leur vie. Cette évolution en faveur de la littératie physique s’accompagne par ailleurs de démarches visant à souligner l’ancrage sociétal de la discipline dont l’apport concret doit impérativement être mis en exergue : le cours d’éducation physique qui présente des liens directs avec ce qui se passe en dehors des murs de l’école. Le professeur d’éducation physique est ainsi de plus en plus présenté comme le potentiel coordinateur de la promotion d’un style de vie actif au sein des établissements scolaires. [less ▲]

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See detail10.1. L'intérêt de la culture en association de froment et de pois protéagineux d'hiver dans un objectif d'autonomie protéique
Pierreux, Jérome ULg; Delaplace, Pierre ULg; Roisin, Christian et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detailVers un nouvel ancrage sociétal du cours d’éducation physique
Cloes, Marc ULg

Conference (2016, February 24)

Since two decades, a growing number of publications underlines the increase of the sedentariness of the society and, in parallel, that of the number of overweight people. It has been demonstrated that ... [more ▼]

Since two decades, a growing number of publications underlines the increase of the sedentariness of the society and, in parallel, that of the number of overweight people. It has been demonstrated that these evolutions will have negative consequences on the health of the citizen at mid and long terms. School is identified as one of the main pillars of the promotion of a physically active lifestyle. By the competences that they acquire during their studies, physical educaiton teachers are considered as the potential corner stone of actions to be implemented in order to allow youth to become citizen responsible of their body and to learn how to use it longlife. That implies reinforcing application of principles that physical educators know very well but that are not necessary integrated systematically in the professional practice. Beforehand to the action on the gym, it means that specific appraoches of teachers education (pre- and in-service) have to be implemented. The presentation proposes to review the current developments and will emphasize the share of good practices in teaching as well as in teacher education. [less ▲]

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See detailIntégration de notions théoriques en rapport avec l’adoption d’un style de vie actif dans le cadre d’un cycle de 13 séances d’éducation physique
Lombard, Gilles ULg

Poster (2016, February 24)

A l’heure actuelle, le professeur d’éducation physique devrait endosser un rôle d’éducateur à la santé (Pühse et al., 2010). Dans cette optique, un projet ludique créé sur base du jeu de société "trivial ... [more ▼]

A l’heure actuelle, le professeur d’éducation physique devrait endosser un rôle d’éducateur à la santé (Pühse et al., 2010). Dans cette optique, un projet ludique créé sur base du jeu de société "trivial pursuit" et destiné à dispenser des informations utiles aux élèves pour le restant de leur vie, a été créé et testé dans l'enseignement supérieur général [less ▲]

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See detail10.2. Evaluation des cultures dérobées implantées en tant que surfaces d'intérêt écologique (SIE) dans le cadre de la PAC 2015-2020
Hancart, F.; Jenet, D.; Lambert, B. et al

in Watillon, B.; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail6. Lutte intégrée contre les maladies
Bataille, Charlotte; Duvivier, Maxime; Heens, Benoît et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail5. Régulateurs de croissance
Henriet, François; Monfort, Bruno; Meza Morales, Walter ULg

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail4. La fumure azotée
Meza Morales, Walter ULg; Monfort, Bruno; Dumont, Benjamin ULg et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail2. Implantation des cultures
Eylenbosch, Damien ULg; Meza Morales, Walter ULg; Monfort, Bruno et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail"Témoigner-pour-mourir" : notes sur Sartre, Bourdieu et le passage par la biographie
Cormann, Grégory ULg

Conference (2016, February 22)

Detailed reference viewed: 25 (2 ULg)
See detailEsquisse d'une méthode et questions émotionnelles
Englebert, Jérôme ULg

Conference (2016, February 22)

Detailed reference viewed: 36 (5 ULg)
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See detailBouger plus: Retour vers le futur
Cloes, Marc ULg

Conference (2016, February 22)

Bouger plus est un projet visant à encourager la pratique de l'activité physique chez les seniors. Il est né dans le cadre d'une collaboration entre le Service Intervention et Gestion en Activités ... [more ▼]

Bouger plus est un projet visant à encourager la pratique de l'activité physique chez les seniors. Il est né dans le cadre d'une collaboration entre le Service Intervention et Gestion en Activités physiques et sportives de l'Université de Liège, d'une part, la Commune d'Esneux, d'autre part. Après avoir analysé les caractéristiques des habitudes des habitants de la la commune en matière d'activité physique, des interventions ont été implantées auprès d'un public cible particulier: les seniors. Ceux-ci sont considérés comme des personnes de 50 ans et plus. L'exposé retracera les différentes étapes de cette collaboration fructueuse puisque, six ans après le lancement de cette initiative citoyenne, des cycles d'activités sont toujours proposés et rencontrent d'ailleurs toujours plus de succès. Une réflexion sera menée à propos de l'évolution en cours du concept et des options qui se présentent pour la pérennisation de ce projet. [less ▲]

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See detailDoes sector-specific experience matter? The case of European higher education ministers
Jacqmin, Julien ULg

Conference (2016, February 22)

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Peer Reviewed
See detailA typology of labour market intermediaries securing nonstandard career paths
Lorquet, Nadège ULg; Pichault, François ULg; Orianne, Jean-François ULg

Conference (2016, February 21)

In a context where the classical vision of organizational careers is eroded, this paper explores how Labour Market Intermediaries (LMIs) can secure nonstandard career paths. To characterize LMIs’ emerging ... [more ▼]

In a context where the classical vision of organizational careers is eroded, this paper explores how Labour Market Intermediaries (LMIs) can secure nonstandard career paths. To characterize LMIs’ emerging roles, we propose a multidimensional grid made up of 6 criteria likely to answer the following questions: 1) where do LMIs come from? 2) who is responsible for the matchmaking process? 3) when do LMIs secure career paths? 4) how do they support professional transitions? 5) what kind of information do they produce and diffuse on the labour market? 6) why do they intervene on the labour market? We validate this analytical framework through its application to five case studies selected to compare the roles LMIs can play in securing careers paths. Beyond the creation of an original grid, results outline two ideal-typical ways of securing transitions. On the one hand, some LMIs offer security by reconstructing internal labour markets and consider workers as ‘quasi-employees’. On the other hand, other LMIs suggest more disruptive solutions in which workers are supported in their job transitions ‘as if’ they were ‘quasi-self-employed’, i.e.: becoming fully responsible for their career. In the conclusion, we discuss societal challenges surrounding these two ideal-typical situations. [less ▲]

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See detailElp3 Lysine Acetyl-Transferase Controls Neuronal Survival in the Developing Inner Ear and is Crucial to Balance and Hearing
Delacroix, Laurence ULg; Mateo Sanchez, Susana ULg; Freeman, Stephen ULg et al

Conference (2016, February 20)

Elp3 lysine acetyl-transferase, the catalytic subunit of the Elongator complex, has been assigned multiple roles in gene transcription, DNA methylation and protein translation efficiency. Given the ... [more ▼]

Elp3 lysine acetyl-transferase, the catalytic subunit of the Elongator complex, has been assigned multiple roles in gene transcription, DNA methylation and protein translation efficiency. Given the importance of acetylation homeostasis in controlling developmental processes together with recent reports implicating Elp3 in cortical neurogenesis, we investigated its role during inner ear formation. In the inner ear, we detected Elp3 transcript in the sensory epithelia of the entire otic vesicle at embryonic day E11.5. At later stages, Elp3 mRNA is strongly expressed in the vestibular and spiral ganglion neurons. To investigate the role of Elp3 in vivo, we used a conditional knock-out mice (Foxg1Cre) in which the expression of the acetyl-transferase is lost in early otocyst. These mice show obvious vestibular defects as indicated by a stereotyped circling ambulation, head bobbing, retropulsion and the absence of a reaching response in the tail-hanging test. Furthermore, we identified a severe hearing loss in Elp3cKO mice through Auditory Brainstem Responses. We show that Elp3 enzyme is crucial for neuronal survival in the spiral ganglion and in the vestibule and that it ensures a correct innervation pattern in the developing inner ear. In the absence of Elp3, a drastic increase in the number of apoptotic neurons was detected by active Caspase-3 and pH2AX immunostainings, particularly during the early stages of development (between E12.5 and E14.5). Postnatally, the neurons remaining in Elp3cKO cochleae seem to establish synaptic contacts with the sensory cells but show obvious signs of cell damage as evidenced by Transmission Electron Microscopy. Taken together, these data support a role for Elp3 in hearing and balance and point out an important role for acetylation homeostasis during inner ear formation. We are currently investigating the molecular mechanisms underlying Elp3 effect on neuronal survival and pathfinding. [less ▲]

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See detailLes dysphasies : nouvelles conceptions théoriques et implications cliniques
Maillart, Christelle ULg

Conference (2016, February 20)

Detailed reference viewed: 47 (5 ULg)
See detailIdentifying Late Egyptian Virtual Relative Clauses
Sojic, Nathalie ULg

Conference (2016, February 19)

Ancient Egyptian so-called "virtual" relative clauses (VRC) are adverbial clauses that function like relative clauses. Descriptions provided by Late Egyptian grammars inform students of their existence ... [more ▼]

Ancient Egyptian so-called "virtual" relative clauses (VRC) are adverbial clauses that function like relative clauses. Descriptions provided by Late Egyptian grammars inform students of their existence and of the possibility to translate them accordingly. But they are not of a great help if one wants to grasp and describe the Late Egyptian relativization system in a linguistic perspective. The talk, given on the occasion of the international Crossroads V conference, aimed at providing interpretive guidelines based on syntax, pragmatics and Discourse Analysis. In my communication, I showed that Discourse Analysis proved to be very fruitful in clarifying some contexts of use of LEg VRCs as well as some interpretive processes. [less ▲]

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See detailComputerized adaptive and multi-stage testing with R
Yan, Duanli; Magis, David ULg

Conference (2016, February 19)

Computerized Adaptive Testing (CAT) has greatly improved the accuracy and efficiency of psychological testing for decades. Multistage Testing (MST) has received much of attention recently. MST is similar ... [more ▼]

Computerized Adaptive Testing (CAT) has greatly improved the accuracy and efficiency of psychological testing for decades. Multistage Testing (MST) has received much of attention recently. MST is similar to CAT such that it allows the adaptation of the difficulty of the test to the level of ability of a test taker. Specifically, in MST, items are interactively selected for each test taker, but rather than selecting individual items, groups of items are selected and the test is built in stages. Over the last decade, researchers have investigated ways for an MST to incorporate most of the advantages from CAT and linear testing, while minimize their disadvantages. These features include testing efficiency and accuracy, greater control of test content, more robust item review, as well as simplified test assembly and administration. Therefore, MST can be an effective compromise between CAT and linear testing, embedding features and benefits from both designs. Thus, MST becomes of more and more interest to researchers and practitioners as technology advances. This presentation will first provide a general overview of a multistage test (MST) design and its important concepts and processes. It will then present the latest development on CAT and MST using R, the mstR package. The presentation will also illustrate how to simulate MST administrations using mstR package, and discuss some practical issues and considerations for MST from design to applications. [less ▲]

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See detailDe uitspraak van Franstalige CLIL-leerders van het Nederlands
Vanackere, Laurine; Van Pée, Marie; Hiligsmann, Philippe et al

Conference (2016, February 19)

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See detailBlack British women filmmakers: towards a genderracial Cinema ?
Herbert, Emilie ULg

Conference (2016, February 19)

Detailed reference viewed: 21 (1 ULg)
Peer Reviewed
See detailSecond argument realization in Earlier Egyptian
Motte, Aurore ULg; Winand, Jean ULg

Conference (2016, February 18)

Detailed reference viewed: 18 (4 ULg)
Peer Reviewed
See detailThe Egyptianness of the Coptic basic vocabulary: A typological view
Grossman, Eitan; Polis, Stéphane ULg

Conference (2016, February 18)

The notion of ‘basic vocabulary’ is associated with the linguist and anthropologist Morris Swadesh, who proposed a list of 200 (and later 100) items. These lists, while widely used in historical and ... [more ▼]

The notion of ‘basic vocabulary’ is associated with the linguist and anthropologist Morris Swadesh, who proposed a list of 200 (and later 100) items. These lists, while widely used in historical and comparative linguistics, are based on Swadesh’s intuitions rather than on empirical research. More recently, however, the Leipzig Loanword Typology Project conducted a cross-linguistic survey of loanwords (Haspelmath & Tadmor 2009). One of the results is a 100-item list of basic vocabulary entries — the ‘Leipzig-Jakarta list of basic vocabulary.’ This list is the product of four factors, computed for a database of 1440 meanings in 41 languages: borrowability, representation in the database, analyzability / simplicity, and age. As Tadmor (2009) points out, this is the first list of basic vocabulary items based on extensive cross-linguistic comparison, and it constitutes a ‘full-fledged basic vocabulary’ that ‘comprises the notions normally associated with this concept: stability (our age score), universality (our representation score) and simplicity (our analyzability score), as well as resistance to borrowing (our unborrowed score)’ (2009: 68). In this talk, we examine this list of 100 meanings in order to evaluate the influence of Greek on the Coptic basic vocabulary, or — to put it the other way around — the ‘Egyptian¬ness’ of the Coptic lexicon, which seems to reflect an intense language contact situation. As a first step, Coptic data were collected from Crum (1939), the most extensive Coptic dictionary, for four dialects: Sahidic, Bohairic, Fayyumic, and Akhmimic. All Coptic lexemes associated with a meaning on the list were collected, even if poorly attested. Additionally, a questionnaire was been submitted to Copticists in order to detect Greek loanwords that would also be used for expressing these 100 meanings. Furthermore, we used etymological tools (Černý 1976; Westendorf 1977; Vycichl 1983) in order to attribute an age score (from 0 = Greek loanword to 4 = Old Egyptian) to the lexemes at two levels: the formal level (when is the word first attested in Ancient Egyptian) and the semantic level (when is the Coptic meaning first associated with this word). The vast majority of meanings (ca. 85%) have at least one pre-Coptic Egyptian cognate, most of which are already attested in Old Kingdom texts. As a result of this study, we are able (1) to evaluate the influence of Greek on the basic vocabulary of the main Coptic dialects, (2) to describe the basic vocabulary of Coptic dialects independently and to observe how they differ from one another, (3) to produce a first estimate of the rate of change in basic vocabularies over the course of Egyptian as a whole. [less ▲]

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See detailDistribution of inorganic and organic contaminants in the intertidal surface sediments along the Hugli River Estuary, eastern part of India
Das, Krishna ULg; Sarkar, Santosh; Thomé, Jean-Pierre ULg et al

Conference (2016, February 17)

Hooghly estuary and coastal environment in north east coast of India has been strongly affected by the rapid human settlements, intensive boating and tourist activities, deforestation and ongoing ... [more ▼]

Hooghly estuary and coastal environment in north east coast of India has been strongly affected by the rapid human settlements, intensive boating and tourist activities, deforestation and ongoing agricultural and aquacultural practices. The present work investigated trace elements (TEs, T-Hg, Al, V, Cr, Fe, Mn, Cu, Zn, Co, Ni, Ca, Sr, Li, Be, P, Mo, Ag, Cd, Sn, Sb, Ba, Pb, Bi, U, As, Se) and organohalogen compounds in surface sediment (top 0-10cm) considering 8 sampling sites along the Hugli River Estuary (HRE), India. The studied organic compounds include polychlorobiphenyls (PCBs), hexachlorocyclohexane isomers (HCHs), dichlorodiphenyltrichloroethane and metabolites (DDTs) and polybromodiphenyl ethers (PBDEs). Textural analyses of the sediment reveal an overall dominance of mud. All trace elements could be detected at variable concentrations in the following descending order: Al>Fe>Ca> P>Mn> Cu> Zn> Ba >V >Cr>Sr>Ni> Li >Co >Pb>As >Se >U >Be >Sn>Bi >Ag >Mo >Cd >Sb. A synchronous enrichment of majority of the elements were observed at the site Gangasagar (~100 km south megacity Calcutta), situated at the confluence of Hugli River and Bay of Bengal, which might be attributed to cumulative impact of the physicochemical processes and multiple anthropogenic sources. It is revealed that PCBs and DDTs were the dominant compounds among the organic pollutants accounting concentrations up to 23.5 ng.g-1 and 4.4 ng.g-1 respectively at the site Babughat, adjacent to the megacity Calcutta. The results have implications for pollution in complex estuarine environment in a meso-macrotidal setup where there is significant influx of sediments carrying huge load of inorganic and organic pollutants mainly due to rapid urbanization and industrialization. [less ▲]

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See detailRecyclable shape-memory materials based on photo- or thermo-reversible reactions
Defize, Thomas ULg; Riva, Raphaël ULg; Thomassin, Jean-Michel ULg et al

Poster (2016, February 16)

Shape-memory polymers (SMPs) are remarkable materials able to switch from a stressed deformed state (temporary shape) to their initial relaxed state (permanent shape) by the application of a stimulus ... [more ▼]

Shape-memory polymers (SMPs) are remarkable materials able to switch from a stressed deformed state (temporary shape) to their initial relaxed state (permanent shape) by the application of a stimulus, such as heat or light. Typically, the shape-memory property is generally observed for chemically or physically cross-linked polymers that exhibit an elastomeric behavior above a phase transition, e.g. glass or melting transition. As an example, cross-linked semi-crystalline poly(ε-caprolactone) (PCL) is widely studied for the development of SMPs. As most of SMPs are irreversibly cross-linked material, their reprocessing is impossible preventing any recycling. Thereby, reversible reactions, allowing the formation/cleavage of the network, raise tremendous interest for the development of new SMPs. Recently, we reported the preparation reversibly cross-linked PCL-based SMP using the Diels-Alder (DA) reaction between furan and maleimide end-groups of 4-arm star-shaped PCL, well-known to create reversible bonds. After implementation, this shape-memory material was demonstrated to be recyclable, and was characterized by excellent fixity and recovery before and after recycling experiments. However, the relatively low retro DA temperature of the furan-maleimide adducts led to an inelastic deformation during shape-memory tensile cycles. In order to get rid of this drawback, an alternative approach was investigated. The substitution of the DA reaction by a photo-reversible reaction, typically the photo-induced (2+2) cycloaddition of coumarins, was proposed to prepare cross-linked PCL matrix presenting one-way and two-way memory properties, since photolabile adducts are supposed to be stable during shape-memory tensile cycles. [less ▲]

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See detailMise en recueil et cyclisation des textes de théâtre
Henrard, Nadine ULg

Conference (2016, February 16)

Sur la base de l'examen d'une variété de cas, cette étude s'intéresse à la manière dont se regroupent les textes de théâtre dans la tradition : rassemblement au sein des manuscrits, collections de textes ... [more ▼]

Sur la base de l'examen d'une variété de cas, cette étude s'intéresse à la manière dont se regroupent les textes de théâtre dans la tradition : rassemblement au sein des manuscrits, collections de textes, cyclisation. Les exemples s'étalent de la fin XIe au XVIe s.; ils sont puisés à des corpus variés (latin, langue d'oc ou d'oïl; théâtre religieux et théâtre profane). [less ▲]

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See detailCycle, cercle, compilation. Introduction
Henrard, Nadine ULg

Conference (2016, February 16)

Introduction à la journée "Cycle, cercle, compilation", s'intéressant à la constitution d'ensembles d'hommes (cercles littéraires) ou de textes (compilations, cycles) au Moyen Âge. Les questionnements ... [more ▼]

Introduction à la journée "Cycle, cercle, compilation", s'intéressant à la constitution d'ensembles d'hommes (cercles littéraires) ou de textes (compilations, cycles) au Moyen Âge. Les questionnements soulevés par cette journée touchent ainsi à tous les stades de la chaîne du texte, de l’écriture à la réception et nécessitent de conjuguer axes synchronique et diachronique, données codicologiques et littéraires, historiques et aussi sociologiques. Ils invitent à interroger la part du hasard et de l’intention qui joue dans le rassemblement des œuvres et montrent, si besoin en était encore, qu’il est indispensable d’inscrire le fait littéraire dans une dynamique globale, en rappelant que les œuvres ne sont que des pièces imbriquées dans divers systèmes avec lesquels elles entrent en dialogue. [less ▲]

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See detailDesiccation cracks formation in clay-barrier for nuclear waste disposal
Hubert, Julien ULg; Prime, Noémie; Plougonven, Erwan ULg et al

Conference (2016, February 16)

In geotechnical engineering, the desiccation cracking of soil is commonly observed. This phenomenon is detrimental to the behavior of earth material and earth structure. Desiccation cracks can lead to the ... [more ▼]

In geotechnical engineering, the desiccation cracking of soil is commonly observed. This phenomenon is detrimental to the behavior of earth material and earth structure. Desiccation cracks can lead to the overall failure of many geotechnical structures: • They can affect the slope stability of earth dams or embankments; • They can initiate internal erosion of embankments due to water flow through the cracks; • They can compromise the efficiency of soil barriers such as landfill liners and top covers. Nowadays, the storage of nuclear waste in deep impermeable geological layers is considered. These storages are based on the multi-barrier principle, the last of which being the host rock, typically a clayey material. In this context, maintaining the very low hydraulic conductivity of the host rock is crucial. Unfortunately, the ventilation of excavated galleries causes convective drying of the host material and can lead to crack formation. This work aims to understand in which conditions exactly, during convective drying, does cracking occur in clayey materials. An experimental campaign has been carried out to characterize the drying behavior of Boom clay which is the host rock at the underground research facility in Mol (Belgium). X-Ray micro-tomography has been used to analyze crack development as well as shrinkage. The experiments are used to calibrate the transfer parameters of a convective drying law based on the limit layer model. This calibration is based on agreement of the drying kinetics. A numerical study is then performed and aims at reproducing the behavior observed during the experiments. A thermo-hydro-mechanical coupled model is used to determine the stress distribution during the drying and a tensile failure criterion is suggested to predict crack genesis. Simulations are performed using the in-house built FEM code LAGAMINE. [less ▲]

Detailed reference viewed: 60 (8 ULg)
See detailLa littérature panoramique par ses éditeurs
Stienon, Valérie ULg

Conference (2016, February 13)

Phénomène de société et de mode, la littérature panoramique identifiée rétrospectivement par Walter Benjamin constitue surtout une entreprise éditoriale majeure. Elle mobilise un grand nombre d’acteurs ... [more ▼]

Phénomène de société et de mode, la littérature panoramique identifiée rétrospectivement par Walter Benjamin constitue surtout une entreprise éditoriale majeure. Elle mobilise un grand nombre d’acteurs (libraires, illustrateurs, graveurs, imprimeurs) à l’échelle européenne et prépare de nouveaux statuts pour la fonction même d’éditeur, qui voit naître un discours spécifique à son propos, dans une époque qui précède de peu sa professionnalisation et dans un contexte de circulation médiatique accrue de l’imprimé sous ses formes les plus variées. La communication se centrera sur deux éditeurs panoramiques français importants, Curmer et Aubert, pour mettre en évidence la nature de leurs projets, l’originalité de leurs méthodes et l’identité de leurs personnels. On reviendra sur le rôle de passeur culturel du premier et de rassembleur d’une équipe d’artistes du second, deux caractéristiques à l’origine du rayonnement de la littérature panoramique. On examinera aussi les particularités de certaines de leurs productions, entre texte et image, journal et livre, ouvrage de collection et fascicule éphémère, jouant sur les matériaux et les circuits de diffusion. [less ▲]

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See detailTrophic plasticity of Antarctic echinoids under contrasted environmental conditions
Michel, Loïc ULg; David, Bruno; Dubois, Philippe et al

Poster (2016, February 12)

Echinoids are common members of Antarctic zoobenthos, and different groups can show important trophic diversity. As part of the ANT-XXIX/3 cruise of RV Polarstern, trophic plasticity of sea urchins was ... [more ▼]

Echinoids are common members of Antarctic zoobenthos, and different groups can show important trophic diversity. As part of the ANT-XXIX/3 cruise of RV Polarstern, trophic plasticity of sea urchins was studied in three neighbouring regions (Drake Passage, Bransfield Strait and Weddell Sea) featuring several depth-related habitats offering different trophic environments to benthic consumers. Three families with contrasting feeding habits (Cidaridae, Echinidae and Schizasteridae) were studied. Gut content examination and stable isotopes ratios of C and N suggest that each of the studied families showed a different response to variation in environmental and food conditions. Schizasteridae trophic plasticity was low, and these sea urchins were bulk sediment feeders relying on sediment-associated organic matter in all regions and/or depth-related habitats. Cidaridae consumed the most animal-derived material. Their diet varied according to the considered area, as sea urchins from Bransfield Strait relied mostly on living and/or dead animal material, while specimens from Weddell Sea fed on a mixture of dead animal material and other detritus. Echinidae also showed important trophic plasticity. They fed on various detrital items in Bransfield Strait, and selectivity of ingested material varied across depth-related habitats. In Weddell Sea, stable isotopes revealed that they mostly relied on highly 13C-enriched food items, presumably microbially-reworked benthic detritus. The differences in adaptive strategies could lead to family-specific responses of Antarctic echinoids to environmental and food-related changes. [less ▲]

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Peer Reviewed
See detailMercury and persistent organic pollutant concentrations in free-ranging bottlenose dolphins from Lower Keys and Coastal Everglades (South Florida)
Damseaux, France ULg; Kiszka, Jeremy; Heithaus, Michael et al

Poster (2016, February 12)

The bottlenose dolphin (Tursiops truncatus) is a major apex predator and the most common cetacean species found in nearshore waters of South Florida, including the Lower Florida Keys (LFK) and the Florida ... [more ▼]

The bottlenose dolphin (Tursiops truncatus) is a major apex predator and the most common cetacean species found in nearshore waters of South Florida, including the Lower Florida Keys (LFK) and the Florida Coastal Everglades (FCE). The objective of this study was 1) to assess contamination levels of total mercury (T-Hg) in skin and persistent organic pollutants (PCBs, PBDEs, DDT, HCH, HCB, DLCs and PCDD/Fs) in blubber samples of bottlenose dolphins from the LFK (8 males and 16 females) and from the FCE (13 males and 9 females). Pollutants were analysed by the mean of Direct Mercury analyser (for T-Hg), GC-ECD (POPs) and GC-MS (DLCs and PCDD/Fs). The PCBs were the main compounds found in bottlenose dolphins from the LFK and FCE. The most present congeners where the CB no. 28, 52, 101, 138, 153 and 180 (ΣPCBs LFK males: 13420.5 ng.g-1 lipids, ΣPCBs LFK females: 9683.4 ng.g-1 lipids, ΣPCBs FCE males: 5637.9 ng.g-1 lipids, ΣPCBs FCE females: 1426.9 ng.g-1 lipids). PCBs concentrations were significantly higher in individuals from the LFK than those from the FCE but significantly lower than those from other locations in the south-eastern US. Unlike organic pollutants, T-Hg concentrations were significantly higher in FCE male dolphins (LFK: 2936.0 ng.g-1 dw, FCE: 10048.3 ng.g-1 dw). These high concentrations were the highest recorded in the south-eastern US and are most likely due to the presence of mangrove ecosystems. This study highlights the complexity of contaminant dynamics (inorganic vs. organic), even at small spatial scales. [less ▲]

Detailed reference viewed: 69 (4 ULg)
Peer Reviewed
See detailBiologie, sociologie, philosophie. Le fait moral entre Durkheim et Bergson
Caeymaex, Florence ULg

Conference (2016, February 12)

Detailed reference viewed: 14 (0 ULg)
See detailDroit international et pacifisme en Belgique de 1870 à 1940 : une cohabitation complexe
Genin, Vincent ULg

Conference (2016, February 12)

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See detailThe secret life of a Mediterranean seagrass litter macrofauna community : a history of oxygen
Remy, François ULg; Michel, Loïc ULg; Sturaro, Nicolas ULg et al

Conference (2016, February 12)

Most of the foliar primary production of Posidonia oceanica, a major Mediterranean seagrass, sheds in autumn and is exported from the meadow to adjacent areas to form "Exported Macrophytodetritus ... [more ▼]

Most of the foliar primary production of Posidonia oceanica, a major Mediterranean seagrass, sheds in autumn and is exported from the meadow to adjacent areas to form "Exported Macrophytodetritus Accumulations", EMAs. These EMAs are a habitat, shelter and feeding place for an abundant and diverse community of macrofauna. Being very dynamic places and potentially playing a role of transition compartment between water column and sediment, EMAs present high variability in term of physicochemical conditions and more specifically in term of oxygen concentration. Mild to severe hypoxic periods (2 - 0.01 mL O2.L-1) can be observed in situ at different moments of the year, and this variability thus potentially play a structuring role on the macrofauna community. During this study, our main specific questions were (1) Does oxygen stratification occur inside EMAs? (2) If present, how long does it take to observe this stratification? (3) Is the macrofauna impacted and do the dominant species occupy defined positions inside the different micro-habitats? To assess the importance of this impact, an experimental study was conducted in October 2014 near the STARESO oceanographic station (Calvi, Corsica) using an original "layer-sampling" design. The experimental construction was put underwater inside an EMA for 48 hours at a depth of 8m. Samples were collected (N=8) in a 20cm thick EMA using "sealed" boxes to sample every 5cm, from the sediment, to the water column. Oxygen, nutrients and of course the litter itself (containing the macrofauna) were sampled carefully to make sure no exchange occurred between the 4 different layers. After data analysis, the assessment was clear: oxygen stratification occurred in less than 48h and oxygen level inside the layer close to the sediment experienced a fast decrease below the hypoxia threshold (2 mL O2.L-1). Diversity was highly impacted, showing a clear positive link with oxygen concentration. Macrofauna also appeared to follow this oxygen stratification but this response was very species specific. Some species didn't follow oxygen and are present in every layer and most of them were strongly positively linked to oxygen concentration. But a few (Nebalia strausi and Athanas nitescens) were strongly negatively linked to oxygen concentration and were present only in the more hypoxic layers. This experimentation thus confirmed our in situ observations. Oxygen stratification occurred quickly (< 48h) when EMAs were experiencing calm weather. This stratification observed from the water column to the sediment was very marked. Diversity and abundance of most abundant macrofauna species were drastically influenced by this stratification, showing the importance of these micro-habitats in structuring of this macrofauna community. [less ▲]

Detailed reference viewed: 43 (6 ULg)
See detailNitrous oxide dynamics in sea ice
Kotovitch, Marie ULg; Fripiat, François; Moreau, Sebastien et al

Poster (2016, February 12)

Fluctuations in greenhouse gases (GHGs) concentration alter the energetic budget of the climate system. There is high confidence that natural systems related to snow, ice and frozen ground (including ... [more ▼]

Fluctuations in greenhouse gases (GHGs) concentration alter the energetic budget of the climate system. There is high confidence that natural systems related to snow, ice and frozen ground (including permafrost) are affected. Nitrous oxide (N2O) is one of the potent GHG naturally present in the atmosphere, but witch has seen his concentration growing since industrial era. N2O has a lifetime in the atmosphere of 114 years and a global warming potential (GWP) of 298 to be compared to carbon dioxide that has a GWP of 1. N2O is also describe as the dominant ozone-depleting substance emitted in the 21st Century. Yet, there are still large uncertainties and gaps in the understanding of the cycle of this compound through the ocean and particularly in sea ice. Sources and sinks of N2O are therefore still poorly quantified. The main processes (with the exception of transport processes) involved in the N2O cycle within the aquatic environment are nitrification and denitrification. To date, only one study by Randall et al. present N2O measurements in sea ice. Randall et al. pointed out that sea ice formation and melt has the potential to generate sea-air or air-sea fluxes of N2O, respectively. Study on ammonium oxidation and anaerobic bacterial cultures shows that N2O production can potentially occur in sea ice. Denitrification can act as a sink or a source of N2O. In strictly anaerobic conditions, N2O is removed by denitrification. However, denitrification can also occur in presence of O2 at trace level concentrations (<0.2 mg L-1), and in these conditions there is a large N2O production. Recent observations of significant nitrification in Antarctic sea ice shed a new light on nitrogen cycle within sea ice. It has been suggested that nitrification supplies up to 70% of nitrate assimilated within Antarctic spring sea ice. Corollary, production of N2O, a by-product of nitrification, can potentially be significant. This was recently confirmed in Antarctic land fast ice in McMurdo Sound, where N2O release to the atmosphere was estimated to 4 µmol.m-2.yr-1. This assessment is probably an underestimate since it only accounts for dissolved N2O while a significant amount of N2O is likely to occur in the gaseous form like N2, O2 and Ar. Finally, nitrification produces little N2O in oxygenated waters but the N2O production yield from nitrification strongly increases as O2 levels decrease. Hence, it is not possible to distinguish the sources of N2O solely based on bulk N2O concentrations or environmental conditions, while deepened knowledge of processes is needed to well understand N2O emissions. [less ▲]

Detailed reference viewed: 40 (4 ULg)
See detailAnnual dynamics of pCO2 within bulk sea ice and related CO2 fluxes at Cape Evans (Antarctica)
Van Der Linden, Fanny ULg; Champenois, Willy ULg; Heinesch, Bernard ULg et al

Poster (2016, February 12)

Sea ice is a biome actively participating in the regional cycling of CO2 as both a source and a sink at different times of the year. In the frame of the YROSIAE project (Year-Round Ocean-Sea-Ice ... [more ▼]

Sea ice is a biome actively participating in the regional cycling of CO2 as both a source and a sink at different times of the year. In the frame of the YROSIAE project (Year-Round Ocean-Sea-Ice-Atmosphere Exchanges), annual dynamics of sea ice pCO2 was compared with CO2 fluxes measured by automated accumulation chambers at Cape Evans (Ross Island, Antarctica). Results confirmed a general trend of brine pCO2 supersaturation with respect to the atmosphere during the late winter (concentration of dissolved inorganic carbon - DIC - in brine and brine expulsion in the brine skim) leading to CO2 degassing, and undersaturation during the spring (carbon-uptake by autotrophs and brine dilution) leading to atmospheric CO2 uptake. Despite high primary production at the bottom of the ice in spring, DIC profiles suggest that sea ice as a whole appears to be net heterotrophic. Still, sea ice absorbs CO2 from the atmosphere, as a result of physical processes. Some variability in the CO2 fluxes (both in magnitude and sign) could not be explained by variability in sea ice pCO2 but rather seemed driven by variability in atmospheric conditions and sea ice surface properties. For instance, in late spring, CO2 fluxes showed a diurnal variability (from CO2 degassing to uptake) related to atmospheric temperature variations. Large and episodic CO2 fluxes were systematically positively correlated with strong wind events, and large CO2 degassing was observed over thin, wet and salty snow cover. [less ▲]

Detailed reference viewed: 36 (14 ULg)
See detailPrésentation du programme de la conférence mondiale des humanités (Liège, août 2017)
Winand, Jean ULg

Conference (2016, February 11)

Detailed reference viewed: 34 (5 ULg)
See detailThe sanctuary of Despoina at Lykosoura: a Megalopolitan creation?
Palamidis, Alaya ULg

Conference (2016, February 11)

Pausanias states that the most important Parrhasian sanctuaries were duplicated in Megalopolis in the aftermath of its creation in the 4th century B.C. A noteworthy exception is the sanctuary of Despoina ... [more ▼]

Pausanias states that the most important Parrhasian sanctuaries were duplicated in Megalopolis in the aftermath of its creation in the 4th century B.C. A noteworthy exception is the sanctuary of Despoina at Lykosoura, which was very ancient according to the author. However, the absence of epigraphical or literary evidence concerning Lykosoura and predating the synoecism and the very limited archaeological material dating to the Archaic and Classical periods suggest that it was the site of a minor cult before the synoecism. The presence of Despoina is not attested before, and it is possible that the cult of the goddess was only developed by Megalopolis, which associated to it several other Arcadian deities and gave it an ancient and local flavour, in order to assert its position as the new cult-centre of Arcadia. Similarly, the sanctuary of Demeter Eleusinia at Basilis may have only been created or developed by Megalopolis, despite its alleged antiquity. This phenomenon finds its closest parallel in the sanctuary of Andania, controlled by the city of Messene. The presence of Demeter and deities associated with her in these sanctuaries, as well as the existence of mysteries, may reflect the growing influence of the sanctuary of Eleusis during the Hellenistic period. [less ▲]

Detailed reference viewed: 39 (1 ULg)
See detailNew ventures in nuclear emergency planning and response: a governance perspective
Van Oudheusden, Michiel ULg; Rossignol, Nicolas ULg; Turcanu, Catrinel

Poster (2016, February 11)

Emergency and disaster management is structured by the complex interaction of natural, social, and technological factors, and contingent on features of culture and organization. Our research serves to ... [more ▼]

Emergency and disaster management is structured by the complex interaction of natural, social, and technological factors, and contingent on features of culture and organization. Our research serves to highlight how these features come into play and shape emergency planning, anticipation, and response. Based on qualitative and quantitative analyses, we devise more resilient, responsive, and adaptive emergency policies for implicated stakeholders (e.g. policymakers, emergency services, regulators) and society at large. Our research foci include citizen science initiatives and stakeholder forums on contaminated goods in the wake of the 2011 Fukushima accident. Our methods are grounded in vulnerability analysis, which accepts that vulnerability is an inherent trait of contemporary societies. [less ▲]

Detailed reference viewed: 34 (3 ULg)
See detailScience, technology and society: opening pathways for integrating social sciences and humanities into nuclear research
Turcanu, Catrinel; Meskens, Gaston; Perko, Tanja et al

Poster (2016, February 11)

The PISA programme was initiated in 1999 within the Belgian Nuclear Research Centre SCK•CEN to study the societal, political, cultural and ethical aspects of the development and use of nuclear technology ... [more ▼]

The PISA programme was initiated in 1999 within the Belgian Nuclear Research Centre SCK•CEN to study the societal, political, cultural and ethical aspects of the development and use of nuclear technology and applications of ionising radiation. The programme was launched as the result of an internal reflection acknowledging that insights from social sciences and humanities were required to better explore normative concepts such as precaution and sustainable development, and to understand attitudes towards nuclear technologies and its governance. This presentation elaborates on the objectives of PISA and its main research tracks. It shows that through its multi-disciplinary approach, the PISA programme of the Belgian Nuclear Research Centre SCK•CEN opens pathways towards such integration, and thus contributes to rendering nuclear research more reflective and more responsive towards society. It explicates the interactions between science, technology and society, in general, and the complexity of nuclear technology assessment, in particular. Last, but not least, due do its reflexive character, PISA research creates an epistemologically and socially enriching dynamic in the organisation itself. [less ▲]

Detailed reference viewed: 40 (3 ULg)
See detailThe dynamics of inequality in Katanga, D.R.Congo. A conversation with Bourdieu
Rubbers, Benjamin ULg

Conference (2016, February 10)

Detailed reference viewed: 37 (0 ULg)
Peer Reviewed
See detailFigures de l'identité et régimes de fiction dans l'espace public
Servais, Christine ULg

Conference (2016, February 09)

Cette communication interroge la notion de figure comme opérateur de publicisation de l'identité singulière, et distingue à cette fin différents régimes de fiction. Il s'agit d'analyser les dynamiques à ... [more ▼]

Cette communication interroge la notion de figure comme opérateur de publicisation de l'identité singulière, et distingue à cette fin différents régimes de fiction. Il s'agit d'analyser les dynamiques à l’œuvre entre la (re)présentation de soi et sa réception dans la formation de jugements publics, ce qui suppose de considérer ensemble le niveau de l'histoire racontée et le niveau de sa lecture. L'objectif est de proposer, pour l’analyse des scènes de publicisation de la singularité, un outillage qui soit en lien avec les questions de jugement et de responsabilité. [less ▲]

Detailed reference viewed: 29 (7 ULg)
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See detailLocal thermal history during the laser additive manufacturing of steel
Mertens, Anne ULg; Hashemi, Seyedeh Neda ULg; Tchuindjang, Jérôme Tchoufack ULg et al

Conference (2016, February 09)

Laser additive manufacturing techniques – such as laser cladding − were developed in the late 1990s as economic layer-by-layer near-net-shape processes allowing for the production or restoration of ... [more ▼]

Laser additive manufacturing techniques – such as laser cladding − were developed in the late 1990s as economic layer-by-layer near-net-shape processes allowing for the production or restoration of complex metallic parts. These techniques are characterised by ultra-fast solidification and cooling rates, thus giving rise to ultra-fine out-of-equilibrium microstructures with potentially enhanced mechanical properties. However, the general quality of a component, as well as its dimensional accuracy, microstructure and final usage properties are strongly influenced by the local thermal history experienced during fabrication. As a consequence, a deeper understanding of the influence of the various processing parameters on the local thermal history during fabrication is of paramount importance, and it can only be reached by combining detailed experimental studies and modeling. Keeping this in mind, the present paper reviews on-going investigations carried out in the Metallic Materials Science Unit of the University of Liege in the laser additive manufacturing of HSS and of stainless steel 316L. [less ▲]

Detailed reference viewed: 129 (20 ULg)
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See detailIn vitro evaluation of protein precipitation capacity of temperate browse species
Vandermeulen, Sophie ULg; Leblois, Julie ULg; Ramírez-Restrepo, Carlos Alberto et al

Poster (2016, February 05)

European agri-environmental policies are promoting the establishment of shrubs and trees on grasslands. The use of browse as fodder requires knowledge on their nutritive value since intensive production ... [more ▼]

European agri-environmental policies are promoting the establishment of shrubs and trees on grasslands. The use of browse as fodder requires knowledge on their nutritive value since intensive production systems are still relying on expensive and environment-costing protein sources. However, information on the influence of temperate condensed tannins (CT)-containing browse forage on rumen protein metabolism is elusive. The study aimed to assess the protein precipitation capacity (PPC) of 10 temperate browse species and establish the correlation between PPC values and plants CT content. PPC of foliage of 3 individuals per woody plants was measured using 2 model proteins: bovine serum albumin (BSA) and casein. The N content in protein solutions (4.6g/L; pH=6.8) was determined before and after adding each forage sample. Extractable CT concentration was quantified by spectrophotometry. The PPC varied across plant species (P<0.001). Corylus avellana had the highest ability to precipitate casein (52.4%). In contrast, the BSA precipitation (18.3%) of this plant was similar to Cornus sanguinea (12.7%), Quercus robur (12.1%) and Crataegus monogyna (11.0%). CT content ranged from 1.4 in Fraxinus excelsior to 82.7g/kg of depigmented sample in Corylus avellana (P<0.001) and was correlated to BSA (r=0.70; P<0.001) and casein PC (r=0.51; P<0.01). It was concluded that woody species could play a significant role in modifying protein metabolism, but further in vivo trials are required. [less ▲]

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See detailBioncontrol of wheat against Septoria Tritici Blotch: new elicitors
Le Mire, Géraldine ULg; SIAH, Ali; Jijakli, Haissam ULg

Poster (2016, February 05)

Wheat is one of the most cultivated crop plants in the world. However, this plant must constantly face numerous biotic challenges, including major yield losses every year (up to 30-50%) due to a foliar ... [more ▼]

Wheat is one of the most cultivated crop plants in the world. However, this plant must constantly face numerous biotic challenges, including major yield losses every year (up to 30-50%) due to a foliar disease known as Septoria Tritici Blotch (STB). This persistent and harmful disease is caused by the fungus Zymoseptoria tritici. Disease control mainly depends on phytosanitary products. However, conventional agriculture is evolving towards more sustainable practices, out of respect for human health and the environment. Elicitors are considered as promising biological control tools for Integrated Plant Management (IPM) strategies. Contrary to conventional products, these natural compounds do not inhibit directly the pathogen but induce a general and systemic resistance in the plant to a large spectrum of diseases. The natural defense mechanisms of the plant are thus stimulated. Few elicitors have yet been successfully tested and formulated to protect wheat against STB. This study focuses on the screening of ten potential elicitor products of various origins and structures to protect winter wheat against Zymoseptoria tritici. Greenhouse trials were carried out to measure the ability of the different products to reduce disease foliar symptoms (necrosis, chlorosis and pycnidia). In addition, the biocide activity of these products directly towards the pathogen was evaluated under greenhouse and laboratory conditions, respectively. The corresponding results will be presented and discussed with the perspective to choose the best elicitor candidates for field trials and to undertake further investigations on the signaling pathways, and the influence of environmental parameters, on the elicitation capacity. [less ▲]

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See detailA glance on characterization of almond kernels from five varieties cultivated in eastern Morocco
Houmy, Nadia; Abid, M.; Addi, M. et al

Poster (2016, February 05)

The Green Morocco Plan is established for 2008-2020 to improve productivity in the agriculture sector and to plant more productive perennial tree crops such as almonds that are better suited for Morocco's ... [more ▼]

The Green Morocco Plan is established for 2008-2020 to improve productivity in the agriculture sector and to plant more productive perennial tree crops such as almonds that are better suited for Morocco's climate. Belgian Development Agency support almond orchards extension in eastern Morocco in purpose to achieve socio-economic improvement. This research is part of a local project (PROFAO) for development of almond in eastern Morocco. The present study evaluates some almond oil parameters fiber and protein content of five almond varieties (Beldi, Fournat, Ferraduel/Ferragnes and Marcona). The aim is to classify varieties on the basis of kernels content of oil and their richness of fibers. Significant variations were found among the five almond varieties examined. Almond oil content ranged from 48 % for Fournat to aproximativly 60 % for Marcona & Beldi. Fatty acids (FA) profiles are slightly different. Oleic acid ranged from 58 % for Marcona to 68 % for Beldi; linoleic acid ranged from 20 % for Beldi to 30 % for Marcona. Saturated FA (palmitic and stearic) were found at levels lesser than 10 %. In almond press cake, total protein content varied between 55 % for Beldi and 48 % for Fournat. The highest total fiber content was found for Fournat (25 %), however Beldi present the lowest rate (16 %). We conclude that Marcona & Beldi would be interesting varieties for almond oil; Fournat seems to be interesting for its richness in fiber. [less ▲]

Detailed reference viewed: 16 (1 ULg)
Peer Reviewed
See detailQui sont les auteurs « Aubert » ? La figure auctoriale en régime promotionnel
Stienon, Valérie ULg

Conference (2016, February 05)

La Maison Aubert et l’esprit d’entreprise de Charles Philipon sont sous la Monarchie de Juillet à l’origine d’un réseau éditorial fructueux et protéiforme fondé sur la diversification des supports (livres ... [more ▼]

La Maison Aubert et l’esprit d’entreprise de Charles Philipon sont sous la Monarchie de Juillet à l’origine d’un réseau éditorial fructueux et protéiforme fondé sur la diversification des supports (livres, journaux, volumes de pittoresques et petits formats de la littérature panoramique), sur le commerce du produit dérivé (« Muséums », caricatures à la pièce, papiers peints) et sur l’exploitation de l’image pour vendre le texte. On sait que Philipon a lancé les carrières de plusieurs dessinateurs importants comme Daumier et Doré. On sait également qu’il a su attirer des collaborateurs de premier choix dans les équipes rédactionnelles de la petite presse satirique de la Caricature et du Charivari. Ces démarches et la production qui en a résulté ont contribué à fonder autour d’une écurie éditoriale une véritable marque de fabrique, sinon une esthétique. Mais ont-elles pour autant participé à l’émergence de figures d’auteurs ? Louis Huart, Taxile Delord, Edmond Texier, Albert Cler, Arnould Frémy, Maurice Alhoy, James Rousseau et bien d’autres sont demeurés des « petits », attachés aux dépôts de pittoresques et aux panthéons comiques. À travers le cas des productions Aubert, il ne s’agira pas d’examiner comment une figure d’auteur identifiable (de son temps et/ou par la postérité) investit ou bénéficie de la publicité, mais d’envisager la problématique complémentaire et en quelque sorte inverse : les modalités de constitution de la figure auctoriale dans un contexte, un réseau et des supports qui jouent d’emblée et pleinement le jeu publicitaire sous ses formes les plus abouties, s’appuyant sur les stratégies économiques et promotionnelles rendues possibles par l’ère médiatique. L’individualité auctoriale peut-elle prendre forme et statut au sein d’une collectivité prépondérante et ouvertement spéculatrice, celle du commerce de la librairie et de la presse fondé sur la collaboration, le transfert et l’interchangeabilité des identités au profit des fonctions socioprofessionnelles ? En d’autres termes, si l’auteur ne peut se faire un nom sans publicité, (comment) peut-il exister lorsque tout n’est que publicité ? [less ▲]

Detailed reference viewed: 16 (1 ULg)
Peer Reviewed
See detailLeachate and leonardite Humic substances effect on in vitro root initiation and elongation of woody species
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Thonart, Philippe ULg et al

Poster (2016, February 05)

Arise from the chemical and biological degradation of plant and animal residues and from the synthetic activities of microorganisms in the soil, humic substances (HS) are natural heterogeneous aromatic ... [more ▼]

Arise from the chemical and biological degradation of plant and animal residues and from the synthetic activities of microorganisms in the soil, humic substances (HS) are natural heterogeneous aromatic and organic compounds. These substances are chemically complex with no clearly defined chemical structure, although generalized models have been proposed. Present everywhere in the nature; they take part in basic functionalities in any ecosystems involving soils, sediments, water and landfills. They have long been recognized as plant growth promoting substances, particularly with regard to influencing nutrient uptake, root growth and architecture. They influence plant productivity directly by the stimulation of biochemical and metabolic processes or indirectly through the modification of soil characteristics and microflora activities. All together, these properties mainly affect root architecture by inducing root hairs proliferation, differentiating root cells and enhancing lateral root emergence. Experiments targeting the rooting stages in absence of interferences were conducted in vitro using HS extracted from landfill leachate and a stable commercial formulation (“Humifirst” from TRADECORP company: 12% humic acid and fulvic acid 3%) issued from leonardite. Shoots and leaves explants of silver birch (Betula pendula Roth) and black alder (Alnus glutinosa L. Gaertn) explants were treated with 10 ppm of leachate and leonardite HS for 5 days during the rooting induction/initiation phase or during rooting elongation phase. The results obtained show that treatment with a low concentration (10 ppm) during induction/initiation phase may be slightly unfavorable to the formation of roots in alder but not in birch. While, in root elongation phase, there is an increase in the number of roots per shoot only in birch. The direct effects of leachate and leonardite HS on root development vary from one species to another. [less ▲]

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