References of "Unpublished conference/Abstract"
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See detailtRNA modification: Elogator sustains Breast cancer metastasis
Delaunay, Sylvain ULg; Rapino, Francesca ULg; Tharun, Lars et al

Conference (2016, May)

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See detailUne poétique du visuel. Arlette Farge entre l'image et le texte
Servais, Amandine ULg

Conference (2016, May)

Les interrogations des théories contemporaines sur l’image et le visuel me permettent de comprendre l’agence historiographique de l’image. En mettant au jour l’originalité de la procédure fargienne ainsi ... [more ▼]

Les interrogations des théories contemporaines sur l’image et le visuel me permettent de comprendre l’agence historiographique de l’image. En mettant au jour l’originalité de la procédure fargienne ainsi que les éléments qui, à mes yeux, la caractérisent, il apparaît que l’image, chez Farge, constitue un modèle épistémique ; elle informe la procédure et, de facto, l’écriture historiennes. Partant, et par une sorte d’effet retour, la pratique singulière d’Arlette Farge pose, de manière renouvelée, une question centrale pour les théories du visuel : les rapports entre visible et dicible, entre « logique » de l’image et « logique » langagière, autrement dit entre ce qui échapperait à la narration et ce qui, au contraire, appartiendrait totalement au régime narratif. [less ▲]

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See detailThe Dark Side of Customer Participation: The Antecedents of Customer Participation Stress
Treger, Stephanie; Büttgen, Marion; Schumann, Jan Hendrik et al

Conference (2016, May)

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See detailEffect of Cooling and Shear Rates on Physicochemical Properties of Binary Fat Blends Based on Shea Stearin
Danthine, Sabine ULg; Delatte, Sophie; Smith, Kevin M. et al

Conference (2016, May)

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See detailMot de cloture
Mescoli, Elsa ULg; Sarcinelli, Alice ULg

Conference (2016, May)

Detailed reference viewed: 17 (3 ULg)
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See detailThat’s embarrassing! Effects of Brand Anthropomorphism on Intimate Disclosure
Gretry, Anaïs ULg; Horváth, Csilla; Belei, Nina

Conference (2016, May)

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See detailAnalyse des effets des exigences d’accountability sur l’organisation du travail des intermédiaires de l’emploi : mise en perspective de tensions identitaires
Beuker, Laura ULg; Gérard, Julie ULg

Conference (2016, May)

Suite aux nombreux bouleversements économiques et sociaux qui ont touché les pays de l’Union européenne fin des années 1980, d’impérieux besoins de lisibilité et de modernisation des services publics de ... [more ▼]

Suite aux nombreux bouleversements économiques et sociaux qui ont touché les pays de l’Union européenne fin des années 1980, d’impérieux besoins de lisibilité et de modernisation des services publics de l’emploi sont apparus. Ceux-ci doivent dorénavant veiller à la mise en œuvre d’exigences a priori incompatibles telles qu’être efficaces, flexibles et respecter une enveloppe budgétaire, tout en œuvrant à l’inclusion sociale. La mise en œuvre de ces exigences s’inscrit dans la lignée du nouveau management public qui introduit les valeurs et les modes de fonctionnement de la firme privée au sein d’administrations publiques à caractère bureaucratique (Pesqueux, 2006 ; Bezes, 2012). Parmi les services publics de l’emploi belges, cette transformation de l’action publique s’apparente à une décentralisation partielle de leurs ressources et de leurs responsabilités auprès de partenaires privés. Ce nouveau mode d’organisation du travail prend la forme de partenariats publics-privés dont la visée est d’assurer conjointement la réinsertion socioprofessionnelle des demandeurs d’emploi (Aubert et Patry, 2004). Dans leurs activités, tant les services publics de l’emploi que les prestataires privés sont amenés à devoir rendre des comptes sur la réalisation de leurs pratiques. Cette exigence d’accountability comporte un double but : (1) être transparent ; (2) légitimer l’utilisation de l’argent public. Prenant appui sur les apports de la sociologie des groupes professionnels, nous analyserons l’influence des exigences d’accountability sur l’organisation du travail des intermédiaires. Pour ce faire, nous avons réalisé une recherche empirique de nature qualitative (N = 317 observations ; N = 40 entretiens semi-directifs) en Fédération Wallonie-Bruxelles auprès de deux prestataires de l’emploi : un public et un privé. Nous montrerons que le travail relationnel d’accompagnement réalisé par ces deux acteurs est résumé par des chiffres et de la saisie de données, rendant de la sorte invisible leur coeur de métier. Initialement engagés pour réaliser une mission foncièrement relationnelle (à savoir l’accompagnement des demandeurs d’emploi), ils sont désormais contraints par des procédures et mus par une logique d’efficacité. Ce hiatus, entre l’aspect relationnel de la fonction et les exigences d’efficacité concomitantes, se cristallise dans deux tensions identitaires, dont nous rendrons compte. [less ▲]

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See detailAfrique des Grands lacs, à la croisée des chemins.
Kabamba, Bob ULg

Conference (2016, May)

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See detailPermutations and negative beta-shifts
Charlier, Emilie ULg; Steiner, Wolfgang

Conference (2016, May)

Elizalde (2011) characterized which permutations can be obtained by ordering consecutive elements in the trajectories of (positive) beta-transformations and beta-shifts. We prove similar results for ... [more ▼]

Elizalde (2011) characterized which permutations can be obtained by ordering consecutive elements in the trajectories of (positive) beta-transformations and beta-shifts. We prove similar results for negative bases beta. [less ▲]

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See detailEn quoi l'ajout d'un élément de gamification (badges) impacte la réalisation des tests d'entraînement ?
Marique, Pierre-Xavier ULg; Van de Poël, Jean-François ULg; Hoebeke, Maryse ULg

Conference (2016, May)

Le département de physique de l’Université de Liège a développé un outil de soutien à l’apprentissage pour le cours de physique à destination des étudiants inscrits en première année de médecine. Le choix ... [more ▼]

Le département de physique de l’Université de Liège a développé un outil de soutien à l’apprentissage pour le cours de physique à destination des étudiants inscrits en première année de médecine. Le choix s’est porté sur une plateforme en ligne afin qu’elle soit accessible à chaque instant et de n’importe quel endroit, moyennant une connexion internet. L’étudiant, interrogé sous forme de questions à choix multiples, peut notamment utiliser un simulateur d’examens. Il peut à tout moment générer un test selon trois paramètres : la ou les matières qu’il souhaite travailler, le temps qu’il désire y consacrer et le niveau de maitrise qu’il souhaite atteindre. Dès lors, un test d’entrainement est généré automatiquement selon les critères choisis. L’étudiant peut visualiser son état d’avancement dans la matière grâce à une série de badges qu’il est invité à collecter. Une fois certains badges acquis, l’apprenant a la possibilité de télécharger un « pass » personnel lui donnant accès à une séance de simulation d’examen organisée en amphithéâtre. Cette étude présentera les premiers résultats de cette expérimentation. La corrélation avec les notes obtenues à l’examen ainsi que l’impact de la mise en place des badges dans le dispositif d’un point de vue motivationnel seront étudiés. [less ▲]

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See detailMixed Component Oleogels Prepared Using Synergistic Combinations of Monoglyceride and Phytosterols
Sintang, Mohd Dona Bin; Rimaux, Tom; Danthine, Sabine ULg et al

Conference (2016, May)

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See detailComparison of 3 Diffractive IOLs in 3 Wavelengths Bifocal/ EDOF/Trifocal.
Gatinel, Damien; Pagnoulle, Christophe; Loicq, Jerôme ULg et al

Conference (2016, May)

Purpose To describe the optical performances of 3 types of diffractive hydrophobic intraocular lenses (IOLs): monofocal achromatic, bifocal and trifocal, using various visible wavelengths. Methods 3 IOLs ... [more ▼]

Purpose To describe the optical performances of 3 types of diffractive hydrophobic intraocular lenses (IOLs): monofocal achromatic, bifocal and trifocal, using various visible wavelengths. Methods 3 IOLs were measured with an optical bench (PMTF,LambdaX,Nivelles, Belgium) to determine modulation transfer function (MTF) and point spread function (PSF). Measurements were performed at 480 nm,546 nm,650 nm using an aberration free cornea and aspheric artificial cornea generating +0.28µm positive spherical aberration by ISO11979-2 guidelines. Through-focus MTF was recorded for various pupil apertures. Evaluation of halos was performed from PSF measurements obtained at each focal spot location. Images of USAF targets were recorded with simulated distances from 1m to 25cm. Amplitude of off-axis peaks of radial profile of PSF enabled to quantify percentage of energy within the halos. Results The monofocal and the bifocal IOLs presented 2 peaks on the through-focus MTF in green light: intermediate vision (at +1.75D) for the monofocal achromatic lens, and far and near vision (at +4D) for the bifocal IOL of the same material. Three peaks (Distance, Intermediate at +1.75D, Near at +3.5D) were recorded with the trifocal IOL at any wavelength. The achromatic monofocal IOL was monofocal for far vision with red light and monofocal for near vision with blue light. The influence of the cornea models was limited. The amount of halos were comparable between lenses (3 to 5 % of the enclosed central light energy). Conclusion The achromatic diffractive IOL behaved like a bifocal IOL with an intermediate addition foci in green light. The bifocal and trifocal IOL induced similar chromatic effects for the near (bifocal, trifocal) and intermediate (trifocal) foci. [less ▲]

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See detailTowards an Novel Stiff String Model for the Torque and Drag Problem
Huynen, Alexandre ULg

Conference (2016, May)

The petroleum industry relies on several kilometer long drillstrings to transmit the axial force and torque necessary to drill the rock formations and reach deep hydrocarbon reservoirs. The assessment of ... [more ▼]

The petroleum industry relies on several kilometer long drillstrings to transmit the axial force and torque necessary to drill the rock formations and reach deep hydrocarbon reservoirs. The assessment of the energy loss along the drillstring, known as the torque and drag problem, plays an essential role in well planning and drilling as the friction appearing at the contacts between the drillstring and the borehole may dramatically increase the costs or, even, be a limiting factor in some configurations. The identification of the number of contacts as well as their positions and extents constitutes the central concern of this question. The nonlinearities associated with the large deflection of the drillstring and the non-penetration condition as well as the a priori unknown number of contacts, however, make the use of conventional numerical tools rather inefficient. To circumvent these difficulties, a simplified stiff string model is derived. Partitioning the global problem in segments of drillstring either in continuous contact with the borehole or free of contact between their extremities, the originality of the proposed formulation lies in the descripion of the drillstring deflection as perturbation of the well-path. [less ▲]

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See detailDétection de la mémoire ischémique myocardique par le 99mTc-fucoïdane : validation pré-clinique.
Mikail, N; Louedec, L; Aid, R et al

Conference (2016, May)

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See detailL’accompagnement des demandeurs d’emploi par les intermédiaires du marché du travail : une triple opération de sélection
Gérard, Julie ULg; Beuker, Laura ULg

Conference (2016, May)

En 1997, la Convention 181 de l’Organisation internationale du travail sonne le glas du monopole public en matière de placement. Elle invite les services publics de l’emploi et les opérateurs privés à ... [more ▼]

En 1997, la Convention 181 de l’Organisation internationale du travail sonne le glas du monopole public en matière de placement. Elle invite les services publics de l’emploi et les opérateurs privés à collaborer pour fournir un accompagnement plus efficace aux demandeurs d’emploi. Cette collaboration s’inscrit dans le cadre d’une entente contractuelle où les services de l’emploi confient l’exploitation et la gestion de certaines de leurs activités à des prestataires privés au sein de partenariats publicsprivés. Qu’il s’agisse des services publics de l’emploi ou des prestataires privés, tous deux ont pour mission d’assurer l’insertion socioprofessionnelle des demandeurs d’emploi en tant que généralistes, ou spécialistes de l’employabilité. Elle s’inscrit dans la stratégie d’EU2020 et contribue à l’atteinte d’un taux d’emploi de 73,2% pour 2020. À l’aide de trois études de cas réalisées auprès du service public wallon et de deux prestataires privés exerçant en Région wallonne, nous démontrerons que cette mission d’accompagnement s’exerce au prix d’une triple sélection : une première réalisée par le politique, via la définition de publics cibles prioritaires ; une seconde opérée par les agents du service public dans leurs pratiques professionnelles d’accompagnement ; une troisième effectuée par les prestataires privés en fonction de critères objectifs et/ou subjectifs. Pour étudier la mise en oeuvre et l’effet de ces opérations de tri, nous nous inscrirons dans une approche pragmatique. Appuyé sur une étude empirique constituée d’entretiens semi-directifs (N = 45), d’observations d’interactions (N = 149) et de discussions informelles, nous montrerons les conséquences globales de ces tris pour les demandeurs d’emploi. En ne sélectionnant que les plus employables des inemployables, l’opération d’accompagnement ne serait-elle finalement qu’une agitation, et non pas une véritable mise à l’emploi ? [less ▲]

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See detailHow Service Managers Can Shape Frontline Employees' Organizational Values to Reduce Person-Role Conflicts
Selzer, Veronika Luisa; Schumann, Jan Hendrik; Büttgen, Marion et al

Conference (2016, May)

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See detailDélinquance et désistance : quelle méthodologie de recherche ?
Puglia, Rosa ULg; Glowacz, Fabienne ULg

Conference (2016, May)

Dans la littérature concernant la délinquance, les auteurs se sont, au départ, principalement intéressés aux raisons qui poussent les individus à commettre des délits mais peu ont tenté de comprendre ... [more ▼]

Dans la littérature concernant la délinquance, les auteurs se sont, au départ, principalement intéressés aux raisons qui poussent les individus à commettre des délits mais peu ont tenté de comprendre pourquoi et comment certains individus, qui ont commis des actes délictueux, sortent de la délinquance. En effet, la désistance, c’est-à-dire le processus de sortie de la délinquance, a longtemps été négligée par les chercheurs. À partir des années '50, un intérêt croissant pour ce domaine de recherche apparaît. La désistance devient alors un sujet d’étude indépendant et non plus un appendice de la recherche sur les carrières délinquantes (Mohammed, 2012). Malgré l’intérêt croissant pour ce champ de recherche, de nombreuses zones d’ombre persistent. Sur base d’une recherche longitudinale réalisée sur une population d’adultes en émergence délinquants (17-25ans), nous tentons d’avoir une approche holistique de la désistance. Celle-ci est définie ici comme un processus impliquant des changements individuels et sociaux, qui s’inscrit dans le temps et qui peut être marqué par des réitérations d’actes délinquants. Dans notre étude, la désistance sera étudiée à travers une approche mixte combinant un récit de vie et des questionnaires. L’approche narrative est essentielle dans notre recherche, elle permettra d’appréhender les transformations identitaires, les schémas de changement et de stabilité dans le parcours de vie et dans la trajectoire délinquante. Elle permettra également de mettre en avant les facteurs internes et externes identifiés comme des facteurs de désistance. Par ailleurs, comme Maruna (2001), nous posons l’hypothèse que les persistants et les désistants sont des individus similaires qui se trouvent à des stades différents du processus de changement. C’est pourquoi, en toile de fond, la désistance sera envisagée à travers le modèle transthéorique de Proshaska et DiClemente (1982) où différentes étapes se succèdent avant l’arrêt du comportement problématique. [less ▲]

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See detailJeunes fugueurs en Belgique : Indicateurs de risque et de protection dans les signalements
Courtain, Audrey ULg; Glowacz, Fabienne ULg

Conference (2016, May)

Chaque année, 1% des foyers européens vit la fugue d’un de ses membres de moins de 18 ans. Au 2 janvier 2014, plus de onze mille jeunes français étaient recherchés comme fugueurs ; avec près de 50.000 ... [more ▼]

Chaque année, 1% des foyers européens vit la fugue d’un de ses membres de moins de 18 ans. Au 2 janvier 2014, plus de onze mille jeunes français étaient recherchés comme fugueurs ; avec près de 50.000 fugues de mineurs français par an. En Belgique, sur les années 2013-2014, l’organisme Child Focus s’est vu confier près de 1700 dossiers de fugues de mineurs. Child Focus - Fondation pour Enfants Disparus et Sexuellement Exploités – a été créée à la suite de l’affaire Dutroux, et traite des dossiers de disparitions de mineurs (enlèvements par un tiers, enlèvements parentaux, fugues) et d’exploitation sexuelle de mineurs. Généralement contacté par la famille du jeune ou par la police, Child Focus ne peut ouvrir un dossier de fugue qu’à la suite d’un procès-verbal. Les dossiers de fugues de mineurs ouverts auprès de Child Focus constitueraient un cinquième des fugues enregistrées par la police belge. Ces dossiers, de par leur contenu, permettent d’envisager trois axes de recherche. Le premier axe porte sur le profil des jeunes signalés en fugue (âge, sexe, contexte familial, scolarité,…). Le second axe porte sur le profil du signalant (père, mère, famille élargie, police,…). Le troisième axe porte sur les indicateurs de risque et de protection que les signalants expriment auprès de Child Focus lorsqu’ils évoquent le jeune en fugue (consommation de drogue, délinquance, santé mentale,…). Ces trois axes sont étudiés à partir de deux recherches empiriques, la première portant sur les 1700 dossiers des années 2013-2014, et la seconde portant sur 200 de ces dossiers, dont nous donnerons les résultats préliminaires. Enfin, par ces recherches, nous proposons d’évaluer la portée des filtres et de la black box permettant de comprendre comment et pourquoi certains cas de fugue sont davantage susceptibles d’être confiés à Child Focus que d’autres. [less ▲]

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See detailChitosan-based nanofibers mats for tissue engineering
Aqil, Abdelhafid ULg; Croisier, Florence ULg; Colige, Alain ULg et al

Conference (2016, May)

Polymer hydrogels resemble the natural living tissue due to their high water content and soft consistency. They find many applications in the design and production of contact and intraocular lenses ... [more ▼]

Polymer hydrogels resemble the natural living tissue due to their high water content and soft consistency. They find many applications in the design and production of contact and intraocular lenses, biosensors membranes, matrices for repairing and regenerating a wide diversity of tissues and organs. Polysaccharides such as chitosan and hyaluronic acid based hydrogels have shown a great potential for biomedical and pharmaceutical applications, on account of their remarkable compatibility with physiological medium. Besides, it is degraded in a physiological environment into non-toxic products, which make them outstanding candidates for short- to medium-term applications, especially for tissue engineering. In this respect, the preparation of nanometric fibers mats based on this polysaccharide are highly interesting as such structure mimics the one of skin extracellular matrix. Such nanofibrous materials can be prepared by electrospinning (Figure 1). This technique uses a high voltage to create an electrically charged jet of polymer solution to obtain polymer fibers ranging from nanometers to a few microns in diameter. We thus have investigated strategies allowing to generate chitosan based nanofiber mats exhibiting a mechanical resistance strong enough to be easily handled while keeping the peculiar features of chitosan hydrogels favoring the interaction with cells and soft tissues to provide efficient tissue reconstruction. In a first strategy, polysaccharide-based nanofibers with a multilayered structure were prepared by combining electrospinning (ESP) and layer-by-layer (LBL) deposition techniques. Elastic nanofibers bearing charges at their surface were firstly prepared by electrospinning poly(ε-caprolactone) (PCL) with a polyelectrolyte precursor. After activation by adjusting the pH, the layer-by-layer deposition of chitosan and hyaluronic acid, can be used to coat the electrospun fibers. A multilayered structure is then achieved by alternating the deposition of the positively charged chitosan with the deposition of a negatively charged polyelectrolyte. These novel polysaccharide-coated PCL fiber mats remarkably combine the mechanical resistance typical of the core material (PCL) – particularly in the hydrated state –, with the surface properties of chitosan. Besides, crosslinked nanofibrous mats of chitosan and polyethylene oxide blends, were successfully prepared via electrospinning technique followed by heat mediated chemical crosslinking. This chemical cross-linking allows adjusting the mechanical resistance of the mats while preserving their biocompatibility. In both cases, the control of the nanofiber structure offered by the electrospinning technology, makes the developed processes very promising to precisely design biomaterials for tissue engineering. Preliminary cell culture tests corroborate the potential use of such systems in wound healing applications. [less ▲]

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See detailInteraction entre la zone endommagée autour d’un tunnel et son soutènement – Simulation numérique
Charlier, Robert ULg; Sillen, Xavier; Li, Xiangling et al

Conference (2016, May)

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See detailQuand les cultures alimentaires se rencontrent. (Re)définition et transmission des pratiques dans un atelier de cuisine arabe en Italie.
Mescoli, Elsa ULg

Conference (2016, May)

Le déplacement des individus est toujours accompagné par le mouvement de choses et pratiques qui voyagent avec eux. Ce fait permet d’étudier la culture matérielle engagée par la mobilité des personnes ... [more ▼]

Le déplacement des individus est toujours accompagné par le mouvement de choses et pratiques qui voyagent avec eux. Ce fait permet d’étudier la culture matérielle engagée par la mobilité des personnes. Cette culture inclut les habitudes alimentaires, qui font l’objet de plusieurs recherches portées sur les changements culinaires (ou les résistances) déterminés par la migration. Loin d’être le seul enjeu constaté lorsque l'on étudie les pratiques alimentaires des migrants – qui par ailleurs sont souvent considérées comme statiques avant la migration –, cette question amène souvent à négliger d'autres dynamiques importantes qui sont également à l’œuvre. Telles que celles qui se produisent lorsque des cultures alimentaires qui se prétendent différentes se rencontrent, ce qui conduit à la mobilisation d’appartenances par les membres de différents groupes culturels qui veulent prendre une position spécifique chacun par rapport à l'autre. Mon exposé vise à analyser cette rencontre. L'hypothèse est qu’elle façonne un espace qui correspond à un tertium quid, une dimension où les frontières des cultures alimentaires peuvent également s’atténuer en raison notamment de la (re)définition et de la transmission des pratiques. Afin de décrire ces dynamiques, je présenterai les données ethnographiques collectées durant un terrain ethnographique porté sur les pratiques culinaires d'un groupe de femmes migrantes marocaines vivant dans la périphérie de Milan, en Italie. Je vais également appuyer ma présentation sur des matériaux visuels recueillis lors des observations et des entretiens dans les maisons ainsi que dans des événements publics tel qu’un cours de cuisine arabe. [less ▲]

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See detailPRODUCTION OF BIOFUELS AND BIOBASED COMPOUNDS IN URBAN BIOREFINERIES: A STRATEGY TO MANAGE WASTE IN WALLONIA?
Richel, Aurore ULg; Haubruge, Eric ULg; Jacquet, Nicolas ULg

Conference (2016, May)

“Urban biorefining” is an original concept aiming at using urban wastes (household wastes, municipal wastes, industrial liquid and/or solid residues and side-products, etc.), mainly of vegetal origin, for ... [more ▼]

“Urban biorefining” is an original concept aiming at using urban wastes (household wastes, municipal wastes, industrial liquid and/or solid residues and side-products, etc.), mainly of vegetal origin, for the production of an array of biofuels and bioproducts. This “urban biorefining” concept fits particularly with the economic, geographic and politic contexts and constraints of the Walloon Region (south part of Belgium). Indeed, Walloon Region is a very small territory (area of about 6,504 sq mi) with a temperate climate. Supply feedstock, mainly arising form forestry and agriculture, are thus rather restricted, submitted to importation, and subjected to non-standardized quality. Several examples of our regional strategy, still available on an industrial scale, are herein proposed and detailed. [less ▲]

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See detailLa critique génétique dans la collection "Poétique"
Lorent, Fanny ULg

Conference (2016, April 29)

La critique génétique est, comme le dit bien Jean-Louis Jeannelle, une « théorie en quête d’elle-même » , tiraillée entre la tradition philologique et les avancées structuralistes. Elle doit sans cesse, à ... [more ▼]

La critique génétique est, comme le dit bien Jean-Louis Jeannelle, une « théorie en quête d’elle-même » , tiraillée entre la tradition philologique et les avancées structuralistes. Elle doit sans cesse, à la fois, se défaire des suspicions positivistes qui pèsent sur elle et justifier son appartenance possible à la (une ?) poétique . Nous voudrions étudier, dans cette communication, les mécanismes de légitimation de cette discipline aux contours épistémologiques complexes au sein même de la collection « Poétique », qui accueillit, en 1998, Les brouillons de soi de Philippe Lejeune et, en 2011, Logiques du brouillon de Daniel Ferrer. Comment les auteurs vont-ils, dans leur ouvrage, justifier leur parution au sein d’une collection dont les présupposés théoriques semblent, a priori, contraires à ceux présidant à leur travail ? Quelles en sont alors les implications méthodologiques, pour chacune des deux disciplines ? [less ▲]

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See detailCognition et imagination. Réflexions à partir de Mach, Musil et Wittgenstein
Zincq, Aurélien ULg

Conference (2016, April 29)

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See detailPhysical activity: an unknown concept
Cloes, Marc ULg

Conference (2016, April 29)

Physical educators do not have necesseraly good representations about physical activity and sedentariness. During the presentation, participants will be involved in an interactive process aiming to ... [more ▼]

Physical educators do not have necesseraly good representations about physical activity and sedentariness. During the presentation, participants will be involved in an interactive process aiming to underline the main concepts that they should use in order to become effective agents of physical activity promotion. [less ▲]

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See detailPercevoir et reconnaître des symboles. La théorie de la représentation iconique de Dominic Lopes.
Hagelstein, Maud ULg

Conference (2016, April 28)

Perceiving and recognizing symbols. Dominic Lopes’ theory of iconic representation. In his works on the epistemological value of images (Understanding Pictures - 1996), Dominic Lopes (Department of ... [more ▼]

Perceiving and recognizing symbols. Dominic Lopes’ theory of iconic representation. In his works on the epistemological value of images (Understanding Pictures - 1996), Dominic Lopes (Department of Philosophy - University of British Columbia) develops an analytical aesthetics primarily concerned with iconic representation. His analysis distinguishes two models of iconic representation comprehension. In the first model, inspired by perceptual approaches like that of Richard Wollheim, the process of image recognition is rooted in perception (to sum it up: perceptualism embraces the idea of « likeness » between the image and what it represents). One of this model’s shortcomings, however, is that it too readily assumes that perception can be a natural, straightforward process. Indeed, iconic representation can not be understood through perception alone, as vision is of course influenced by cultural and, most of all, cognitive processes. A representative model thus needs to account for the ways in which iconic recognition differs from ordinary visual recognition. In the second model, which build off of symbolic approaches like that of Nelson Goodman, iconic representation works the same way as other types of symbols, particularly linguistic ones. Thus, this approach considers the similarities between images and language (representations which are both affected by processes of denotation and predication). However, we all know how strongly image theoreticians have been resisting the linguistic paradigm (iconic turn topic): some worry about overlooking the image’s semantic density in favor of its « simple » descriptive quality. Lopes finds a path between these two models by developing a « theory of aspect recognition », which incorporates perceptive elements into a symbolic structure. According to Lopes, if we agree that images belong to symbolic systems of denotation, then « they might be symbols for which the reference is dependent on the carrying out of perceptive aptitudes », a claim which my talk will explore. I will also discuss how Lopes’ theory accounts for skills acquisition (the capacity to recognize) through images, and shows how images help these skills progressively develop. [less ▲]

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See detailLa ligne et la boucle. Michel Strogoff ou l'involution
Durand, Pascal ULg

Conference (2016, April 28)

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See detailAdministration of Third-Party Mesenchymal Stromal Cells at the Time of Kidney Transplantation: Interim Safety Analysis at One-Year Follow-Up
Erpicum, Pauline ULg; WEEKERS, Laurent ULg; DETRY, Olivier ULg et al

Conference (2016, April 28)

Objective. Mesenchymal stromal cells (MSC) therapy has been suggested in kidney transplantation (KTx). We report on the 1-year follow-up of an open-label phase I trial using MSC at the time of KTx ... [more ▼]

Objective. Mesenchymal stromal cells (MSC) therapy has been suggested in kidney transplantation (KTx). We report on the 1-year follow-up of an open-label phase I trial using MSC at the time of KTx. Methods. On postoperative day 3 (D3), third-party MSC (~2.0x106/kg) were administered to 7 non-immunized first-transplant recipients from deceased donors, under standard immunosuppression (Basiliximab, Tacrolimus, MMF and steroids). No HLA matching was required for MSC donors. In parallel, 7 comparable KTx recipients were included as controls. Written informed consent was obtained from all participants. Results. No hemodynamic or immune-allergic side-effect was noted at the time of MSC injection. Still, 1 patient with a history of ischemic heart disease had a NSTEMI ~3h after MSC infusion. Four MSC patients presented with CMV reactivation within 165 ± 96 days post KTx, whereas 3 controls had positive polyoma-BK viremia within 92 ± 4d post KTx. Three MSC patients were affected by pneumonia within 269 ± 98d post KTx, whereas 3 controls had urinary infection within 48 ± 43d post KTx. No MSC engraftment syndrome was observed. At D14, eGFR in MSC and control groups was 47.1 ± 6.8 and 39.7 ± 5.9 ml/min, respectively (p, 0.05). At 1 year, eGFR in MSC and control groups was 43.1 ± 17.8 and 53.9 ± 13.4 ml/min, respectively (p, 0.25). At 3-month protocol biopsy, no rejection was evidenced in MSC or control patients. Later on, 1 acute rejection was diagnosed at D330 in 1 MSC patient. No biopsy-proven AR was noted in controls. Three patients developed anti-HLA antibodies against MSC (n=1) or shared kidney/MSC (n=2) mismatches. Conclusions. MSC infusion was safe in all patients except one. Incidence of opportunist and non-opportunist infections was similar in both MSC and control groups. No MSC engraftment syndrome was documented. No difference in eGFR was found at 1 year post KTx. Putative immunization against MSC was observed in 3 patients. [less ▲]

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See detailDiscontinuity lines in superconducting films with predefined edge defects
Brisbois, Jérémy ULg

Conference (2016, April 27)

We present a thorough investigation by magneto-optical imaging of the magnetic flux penetration in Nb thin films with lithographically defined border indentations. We demonstrate that discontinuity lines ... [more ▼]

We present a thorough investigation by magneto-optical imaging of the magnetic flux penetration in Nb thin films with lithographically defined border indentations. We demonstrate that discontinuity lines (d-lines), caused by the abrupt bending of current streamlines around the indentations, depart from the expected parabolic trend close to the defect and depend on the shape and size of the indentation as well as on the temperature. These findings are backed up and compared with theoretical results obtained by numerical simulations and analytical calculations highlighting the key role played by demagnetization effects and the creep exponent n. In addition, we show that the presence of nearby indentations and submicrometer random roughness of the sample border can severely modify the flux front topology and dynamics. Strikingly, in contrast to what has been repeatedly predicted in the literature, we do not observe that indentations act as nucleation spots for flux avalanches, but they instead help to release the flux pressure and avoid thermomagnetic instabilities. [less ▲]

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See detailOikoi and State. A new light on Upper Mesopotamian economic system
Mas, Juliette ULg

Conference (2016, April 27)

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See detailLe diabète et la sélection médicale
PAQUOT, Nicolas ULg

Conference (2016, April 27)

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See detailJupiter’s magnetopause: A search for reconnection and wave signatures
Bonfond, Bertrand ULg; Kivelson, Margaret; Khurana, Krishan et al

Conference (2016, April 26)

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See detailThe many aurorae of Jupiter: proxis of the magentospheric dynamics
Bonfond, Bertrand ULg

Conference (2016, April 25)

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See detailGuerrier de Dieu ou mercenaire dangereux et inutile ? Usages de la relation de guerre par l’internonce Bichi comme stratégie de déstabilisation du duc Charles IV de Lorraine (1645-1646).
Regibeau, Julien ULg

Conference (2016, April 22)

Le 22 décembre 1645, l’internonce en poste à Bruxelles, Antonio Bichi, donne l’absolution à Charles IV de Lorraine. La sentence prononcée par l’envoyé pontifical doit mettre fin à plus de trois années de ... [more ▼]

Le 22 décembre 1645, l’internonce en poste à Bruxelles, Antonio Bichi, donne l’absolution à Charles IV de Lorraine. La sentence prononcée par l’envoyé pontifical doit mettre fin à plus de trois années de tensions qui font suite à la bulle d’excommunication fulminée par le pape Urbain VIII à l’encontre du duc. Pour le Saint-Siège l’enjeu diplomatique de ce geste est grand. Charles IV, duc de Lorraine et de Bar, est en effet un membre important du parti des dévots, hostile à Richelieu et à sa politique d’abaissement de la maison d’Autriche. Réfugié aux Pays-Bas espagnols depuis l’occupation de ses États par le cardinal, en 1634, il prend part aux dernières phases de la guerre de Trente Ans en mettant ses troupes au service des Habsbourg, aussi bien en France que dans l’Empire. Or, l’excommunication du duc a peu à peu créé des dissensions au sein du clergé et du gouvernement des Pays-Bas. L’irritation qui règne menacerait même la bonne conduite de la guerre menée contre la France et ses alliés protestants. Si, à première vue, la papauté ne prend pas une part active dans ce conflit, elle veille, à travers ses nonces, aux intérêts catholiques qui sont en jeu. À l’occasion de ma communication, je souhaiterais étudier en détails la politique de l’internonce Bichi durant les mois qui précèdent et qui suivent l’absolution de Charles IV. Je désire, pour ce faire, m’arrêter sur l’une des stratégies que le prélat met en place pour mener le duc à se conformer aux instances du Saint-Siège ; à savoir jeter le discrédit sur l’action militaire de celui-ci. La déconstruction systématique de l’image militaire du duc par l’internonce puise ses arguments dans une rhétorique humaniste, largement diffusée par Machiavel et Guichardin, pour bâtir l’image, à la fois archétypale et ancrée dans le présent de la guerre de Trente Ans, d’un condottiere dangereux et inutile, dont les Habsbourg devraient se prémunir. Prenant place au sein d’un arsenal de ressources variées (maîtrise de l’information, entreprise de désinformation, emploi de différents registres de discours, entretien de réseaux d’intérêts,…), cette stratégie dévoile son efficacité à partir du moment où elle est intériorisée par la Curie romaine et fournit un argument supplémentaire à cette dernière pour faire pression sur le gouverneur-général des Pays-Bas, le marquis de Castel Rodrigo. La représentation propagée par l’internonce peine cependant à masquer l’image, toute aussi efficace, de guerrier de Dieu que Charles IV, héritier des Guises et de l’idéologie de la croisade, convoque et entretient. Il ressort donc de la correspondance de l’internonce une représentation plurielle et ambivalente du duc-soldat ; paradoxe apparent qui reflète bien l’état de tension qui règne alors au sein de la cour de Bruxelles autour de Charles IV et de son excommunication. [less ▲]

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See detailKeratinocyte RabGEF1 maintains skin homeostasis in vivo.
Marichal, Thomas ULg

Conference (2016, April 22)

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See detailOccurrence, fate and risk assessment of personal care products in river-groundwater interface
Jurado Elices, Anna ULg; Serra-Roig, M. Pau; Diaz-Cruz, M. Silvia et al

Conference (2016, April 21)

This work presents the occurrence and fate of selected personal care products (PCPs) in the urban river-groundwater interface. To this end, urban groundwater and river samples were collected in Sant Adrià ... [more ▼]

This work presents the occurrence and fate of selected personal care products (PCPs) in the urban river-groundwater interface. To this end, urban groundwater and river samples were collected in Sant Adrià del Besòs (NE of Spain) and a total of 16 PCPs were analyzed including benzophenone derivatives, camphor derivatives, p-aminobenzoic acid derivatives, triazoles and parabens in three different campaigns (from May 2010 to July 2014). These compounds reach the aquifer through the recharge of River Besòs that receives large amounts of effluents from waste water treatment plants. Results shown that most of compounds were not or barely detected (maximum concentrations around 30 ng/L) in groundwater samples during the different sampling campaigns. Only two triazoles, named as benzotriazole (BZT) and methyl benzotriazol (MeBZT) were found at high concentrations in groundwater samples (maximum concentration around 2000 ng/L). The fate of PCPs in the aquifer was assessed using mixing analysis considering the temporal variability of the River Besòs. Overall, measured groundwater concentrations were significantly much lower than those estimated by the mixing of the river water. This observation suggested that most of the PCPs are naturally removed when river water infiltrates the aquifer. However, some compounds were more persistent in the aquifer. These compounds were in descending order: the triazoles MeBZT and BZT followed by the camphor derivative 4MBC. The measured concentrations allowed us to assess the environmental risk posed by the selected UV-Fs (e.g. benzophenone derivatives) in the river-groundwater samples. Hazard Quotients (HQs) for diferent aquatic species were calculated in order to characterise the ecotoxicity potential of the studied compounds in the river-groundwater interface. HQ values will be presented and discussed in the presentation. [less ▲]

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See detailAssessing heat tracing experiment data sets for direct forecast of temperature evolution in subsurface models: an example of well and geophysical monitoring data
Hermans, Thomas ULg; Klepikova, Maria; Caers, Jef

Conference (2016, April 21)

Hydrogeological inverse modeling is used for integrating data and calibrating subsurface model parameters. On one hand, deterministic approaches are relatively fast but fail to catch the uncertainty ... [more ▼]

Hydrogeological inverse modeling is used for integrating data and calibrating subsurface model parameters. On one hand, deterministic approaches are relatively fast but fail to catch the uncertainty related to the spatial distribution of model parameters. On the other hand, stochastic inverse modeling is time-consuming and sampling the full high-dimensional parameter space is generally impossible. Even then, the end result is not the inverted model itself, but the forecast built from such models. In this study, we investigate a prediction-focused approach (PFA) in order to derive a direct statistical relationship between data and forecast without explicitly calibrating any models to the data. To derive this relationship, we first sample a limited number of models from the prior distribution using geostatistical methods. For each model, we then apply two forward simulations: the first corresponds to the forward model of the data (past), the second corresponds to the forward model of the forecast (future). The relationship between observed data and forecast is generally highly non-linear, depending on the complexity of the prior distribution and the differences in the two forward operators. In order to derive a useful relationship, we first reduce the dimension of the data and the forecast through principal component analysis (PCA) related techniques in order to keep the most informative part of both sets. Then, we apply canonical correlation analysis (CCA) to establish a linear relationship between data and forecast in the reduced space components. If such a relationship exists, it is possible to directly sample the posterior distribution of the forecast with a multi-Gaussian framework. In this study, we apply this methodology to forecast the evolution with time of the distribution of temperature in a control panel in an alluvial aquifer. We simulate a heat tracing experiment monitored with both well logging probes and electrical resistivity tomography. We show (1) that the proposed method can be used to quantify the uncertainty on the forecast both spatially and temporally and (2) that spatially-distributed data acquired through geophysical methods help to significantly reduce the uncertainty of the posterior. [less ▲]

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See detailSources pour l’étude des transferts de cultes en Grèce antique
Palamidis, Alaya ULg

Conference (2016, April 20)

A couple of Greek inscriptions show that it was possible to transfer a cult, that is to no longer honour a deity in their original sanctuary, but in a new one founded on this occasion at a different ... [more ▼]

A couple of Greek inscriptions show that it was possible to transfer a cult, that is to no longer honour a deity in their original sanctuary, but in a new one founded on this occasion at a different location. However, they provide few elements to study this phenomenon. The contribution of literary sources is also very limited. Thus, the 1st century A.D. author Strabo mentions four cases of cult transfers, which, however, prove not to correspond to historical events. We should therefore turn to archaeological sources, and especially to the negative evidence: the absence of archaeological material testifying to the frequentation of a sanctuary while the cult of the deity is still attested by other sources provides the best clue to such transfers. On the contrary, there is positive evidence for the relocation of temples, which were entirely taken down and reconstructed elsewhere — the so-called «Wandering temples» — but the reuse of building materials does not imply the transfer of the cult. Further indications that a cult was transferred include coins or even the orientation of temples. [less ▲]

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See detailVolunteering Citizens in Nuclear Risk Governance: Citizen Science after Fukushima
Van Oudheusden, Michiel ULg; Turcanu, Catrinel; Yoshizawa, Go et al

Conference (2016, April 20)

Citizen science (CS) is a form of science developed and enacted by citizens, typically with citizen volunteers collecting and/or analyzing various kinds of data. Whereas common forms of CS like bird ... [more ▼]

Citizen science (CS) is a form of science developed and enacted by citizens, typically with citizen volunteers collecting and/or analyzing various kinds of data. Whereas common forms of CS like bird counting and amateur astronomy generally elicit interest and approval on behalf of scientists, decision makers, and publics at large, CS in the nuclear field is far more contentious. This is due to the controversial nature of nuclear science and technology, as evidenced by public disputes about nuclear energy, nuclear waste management, and nuclear accidents, among others. Starting from these observations, this paper probes the risky, disputed character of CS in nuclear emergency and post-accident situations. It specifically looks at CS in Japan after the 2011 Fukushima Daiichi nuclear disaster, where citizens in affected areas monitor radioactivity in the environment and communicate about health and environmental risks with one another (e.g. Citizens’ Radioactivity Monitoring Project). In these processes, citizen scientists voice ardent criticism of government, industry, and academia, as these institutes are seen to deliberately spread biased information to sustain an illusion of control (http://blog.safecast.org). By taking science and technology into their own hands, they challenge conventional notions of citizen engagement, science, and avocation/volunteerism. The paper draws on the notions of contentious politics and issue politics (e.g. Marres 2005) to highlight the issue-driven, adversarial and untamed character of post-Fukushima CS in the nuclear field. It is argued that these notions better capture what CS after Fukushima amounts to, as conventional representations (e.g. volunteer sensing, “citizens as sensors,” public participation in scientific research) downplay scientific uncertainties and power asymmetries between citizens and authorities, and do not account for how “Fukushima” is reconfiguring scientific citizenship in novel ways. [less ▲]

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See detailVers des systèmes d’information archéologique : maquette virtuelle et nuages de points intelligents
Billen, Roland ULg; Van Ruymbeke, Muriel ULg; Pfeiffer, Michelle et al

Conference (2016, April 20)

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See detailCyclic and oligo-carbonates by organocatalytic coupling of CO2 with epoxides or oxetanes
Alves, Margot ULg; Grignard, Bruno ULg; Boyaval, Amélie ULg et al

Conference (2016, April 20)

Valorising CO2 as a renewable C1 feedstock for producing added value building blocks is the scope of many academic and industrial researches. Carbon dioxide is a thermodynamically and kinetically stable ... [more ▼]

Valorising CO2 as a renewable C1 feedstock for producing added value building blocks is the scope of many academic and industrial researches. Carbon dioxide is a thermodynamically and kinetically stable molecule that can be converted into five and six membered cyclic carbonates by coupling with epoxides or oxetanes, respectively, using appropriate catalysts. Although transition metal catalysts are efficient under atmospheric pressure and ambient temperature, most of them are poorly selective, sensitive to hydrolysis and/or oxidation and/or toxic whereas less/non-toxic and eco-friendly organocatalysts such as ionic liquids and halide salts are generally only efficient at very high temperature and pressure favouring their thermal degradation. To overcome these limitations, we developed a new highly efficient bicomponent homogeneous organocatalyst composed of an ammonium salt as the catalyst and fluorinated single or double hydrogen bond donor activators. Through online FTIR kinetic studies, we demonstrated that this new organocatalyst showed unexpected catalytic activity for the fast and selective addition of CO2 onto epoxides under solvent-free and mild experimental conditions. The use of this dual catalyst was then extended to the coupling of CO2 with less reactive oxetanes to produce hydroxyl telechelic oligocarbonates. In the first part of this talk, based on kinetics of reactions followed by online FTIR under pressure, we will describe the reaction conditions required for the organocatalytic coupling of CO2 with epoxides and oxetanes. In the second part, the mechanism of the reaction will be approached and discussed based on DFT calculations. Finally, we will compare and discuss the efficiency of various organocatalytic systems for this type of reaction. [less ▲]

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See detailMonitoring the occurrence of invasive plants in different types of natural habitats
Monty, Arnaud ULg; Frisson, Gwenn; Delbart, Emmanuel et al

Conference (2016, April 19)

Protected areas and the Natura 2000 network are keystones of the EU nature and biodiversity policy. However, alien plants do not stop their spread at the border of protected areas and invasive plants are ... [more ▼]

Protected areas and the Natura 2000 network are keystones of the EU nature and biodiversity policy. However, alien plants do not stop their spread at the border of protected areas and invasive plants are reported to threaten many ecosystems, from aquatic and riparian areas to dry and xeric sites. The presentation summarizes three large-scale quantitative assessments of the occurrence of exotic plants in Wallonia, i.e. the southern part of Belgium. Three types of natural habitats were the focus of the assessments: i) ponds and lakes (400 sites); ii) river banks (187 sites); and iii) xeric ecosystems such dry grasslands, rocky habitats and screes (86 sites). In the three studies, sites were selected through a stratified sampling then visited. Exotic plants were recorded and their abundance assessed. Additional information about population dynamics, environmental conditions and visible impacts was recorded. Elodea spp. were the most common species in water bodies, with occurrence rates reaching 2.7%. Other aquatic alien species were found, but with an occurrence rate below 1%. Along rivers, 51 alien species were observed. Some were widespread (e.g. Impatiens glandulifera, with 17 % of linear banks invaded) whereas others were either rare or considered emergent alien species. Analyses showed that typical riparian species’ occurrence increased with the size of the watershed, indicating propagule pressure within protected areas through hydrochory. In xeric sites, the most common species were either cultivated or ornamental ones such as Juglans regia, Cotoneaster horizontalis, Prunus serotina, Robinia pseudoacacia and Buddleja davidii. The former was found in 15.1% of the visited sites. The implications of the different results, notably about emergent species, are related to the need for an effective early detection system. [less ▲]

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See detailDecrease in hydroclimatic conditions generating floods in the southeast of Belgium over the last 50 years
Wyard, Coraline ULg; Fettweis, Xavier ULg

Conference (2016, April 19)

As a consequence of climate change, several studies concluded that winter flood occurrence could increase in the future in many rivers of northern and western Europe in response to an increase in extreme ... [more ▼]

As a consequence of climate change, several studies concluded that winter flood occurrence could increase in the future in many rivers of northern and western Europe in response to an increase in extreme precipitation events. This study aims to determine if trends in extreme hydroclimatic events generating floods can already be detected over the last century. In particular, we focus on the Ourthe River (southeast of Belgium) which is one of the main tributaries of the Meuse River with a catchment area of 3500 km² . In this river, most of the floods occur during winter and about 50% of them are due to rainfall events associated with the melting of the snow which covers the Ardennes during winter. In this study, hydroclimatic conditions favourable to floods were reconstructed over the period 1959-2010 using the regional climate model MAR (“Modèle Atmosphérique Régional”) forced by the following reanalyses: the ERA-20C, the ERA-Interim and the NCEP/NCAR-v1. The use of the MAR model allows to compute precipitation, snow depth and run-off resulting from precipitation events and snow melting in any part of the Ourthe river catchment area. Therefore, extreme hydroclimatic events, namely extreme run-off events, which could potentially generate floods, can be reconstructed using the MAR model. As validation, the MAR results were compared to weather station-based data. A trend analysis was then performed in order to study the evolution of conditions favourable to flooding in the Ourthe River catchment. The results show that the MAR model allows the detection of about 90% of the hydroclimatic conditions which effectively generated observed floods in the Ourthe River over the period 1974-2010. Whatever the reanalysis used to force the MAR model, the conditions favourable to floods due to snowpack melting combined with rainfall events present a significant negative trend over the last 50 years as a result of a decrease in snow accumulation. However, regarding the conditions favourable to floods due to rainfall events alone, the signal of the trend depends on the reanalysis used to force the model. [less ▲]

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See detailNew methodology to detect toxin-nAChRs binding by MALDI-TOF mass spectrometry
Echterbille, Julien ULg; Gilles, Nicolas; Araoz, Romulo et al

Conference (2016, April 18)

More than 50 thousands of venomous species are currently indexed in the world. Each of their venoms is composed of 200 to 1000 different toxins which potentially exhibit a high selectivity for membrane ... [more ▼]

More than 50 thousands of venomous species are currently indexed in the world. Each of their venoms is composed of 200 to 1000 different toxins which potentially exhibit a high selectivity for membrane receptors such as G-protein coupled receptors or ion channels such nicotinic acetylcholine receptors (nAChRs). The latter have been a target for drug discovery efforts, primarily for central nervous system indications. Therefore, it appears of prime interest to design new pharmacological tools and potentially discover future drugs targeting this kind of ion channels. In 2015, our group published a new mass spectrometry-based methodology to screen peptide ligands for G protein coupled receptors1. The proof of concept of this methodology was built by studying the binding of [Arg8]-vasopressin (AVP) on type 2-vasopressin receptor (V2). We extended this methodology to another system ligand-receptor. As all Conus species venoms investigated so far contain at least one toxin antagonizing nAChRs: the alpha-conotoxins. Therefore, the ligand-receptor model couple that has been chosen is nAChRs-alpha-conotoxins. Experimentally, fragments of cellular membranes over-expressing nAChRs were incubated with Bovine Serum Albumine (BSA) tryptic digest (~100 peptide toxins) doped by a small amount of Alpha-conotoxins. After 2 hours incubation, free and bound fractions were purified with a combination of centrifugation and micro column purifications. Samples were finally analyzed with a MALDI-TOF/TOF mass spectrometer. By comparison of the intensity of Alpha-conotoxins in the free and in the bound fractions, we clearly detect an enrichment of nAChRs ligand in the latter. In order to transpose the methodology to natural mixture, we applied the workflow to crude conus venoms. We incubated membranes over-expressing nAChRs with Conus textile venom which is known to possess at least 5 different alpha-conotoxins. Thanks to our approach, we were able to detect an enrichment of these known ligands in the bound fraction. In order to validate the potential of our approach, the next step of this work will be the incubation of a Conus venom for which no alpha-conotoxins have been described. [less ▲]

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See detailInter-system biases estimation in multi-GNSS relative positioning with GPS and Galileo
Deprez, Cécile ULg; Warnant, René ULg

Conference (2016, April 18)

The recent increase in the number of Global Navigation Satellite Systems (GNSS) opens new perspectives in the field of high precision positioning. Particularly, the European Galileo program has ... [more ▼]

The recent increase in the number of Global Navigation Satellite Systems (GNSS) opens new perspectives in the field of high precision positioning. Particularly, the European Galileo program has experienced major progress in 2015 with the launch of 6 satellites belonging to the new Full Operational Capability (FOC) generation. Associated with the ongoing GPS modernization, many more frequencies and satellites are now available. Therefore, multi-GNSS relative positioning based on GPS and Galileo overlapping frequencies should entail better accuracy and reliability in position estimations. However, the differences between satellite systems induce inter-system biases (ISBs) inside the multi-GNSS equations of observation. Once these biases estimated and removed from the model, a solution involving a unique pivot satellite for the two considered constellations can be obtained. Such an approach implies that the addition of even one single Galileo satellite to the GPS-only model will strengthen it. The combined use of L1 and L5 from GPS with E1 and E5a from Galileo in zero baseline double differences (ZB DD) based on a unique pivot satellite is employed to resolve ISBs. This model removes all the satelliteand receiver-dependant error sources by differentiating and the zero baseline configuration allows atmospheric and multipath effects elimination. An analysis of the long-term stability of ISBs is conducted on various pairs of receivers over large time spans. The possible influence of temperature variations inside the receivers over ISB values is also investigated. Our study is based on the 5 multi-GNSS receivers (2 Septentrio PolaRx4, 1 Septentrio PolaRxS and 2 Trimble NetR9) installed on the roof of our building in Liege. The estimated ISBs are then used as corrections in the multi-GNSS observation model and the resulting accuracy of multi-GNSS positioning is compared to GPS and Galileo standalone solutions. [less ▲]

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See detailA forskolin free method for measuring cAMP modulation by Gi coupled receptors
Hanson, Julien ULg

Conference (2016, April 18)

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See detailAre BVOC exchanges in agricultural ecosystems overestimated? Insights from fluxes measured in a maize field over a whole growing season
Bachy, Aurélie ULg; Aubinet, Marc ULg; Schoon, Niels et al

Conference (2016, April 18)

This oral communication aims to present the main outputs of the BVOC (Biogenic Volatile Organic Compounds) flux measurement campaign performed on a maize field in Belgium. It begins by highligthing the ... [more ▼]

This oral communication aims to present the main outputs of the BVOC (Biogenic Volatile Organic Compounds) flux measurement campaign performed on a maize field in Belgium. It begins by highligthing the interest of investigating BVOC exchanges on maize; then measurement techniques are briefly presented. The second half of the communication aims to present and discuss the main outputs of this measurement campaign (similar BVOC composition, lower exchange rate than other maize and cropland/grassland studies, significant importance of soil in ecosystem exchanges, strong differences between exchanges rates observed in this study and those used by up-scaling models). [less ▲]

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See detailContrasted terrace systems of the lower Moulouya valley as indicator of crustal deformation in NE Morocco
Rhixon, Gilles; Bartz, Melanie; El Ouahabi, Meriam ULg et al

Conference (2016, April 17)

The Moulouya has the largest catchment in Morocco and drains an area which is characterized by active crustal deformation during the Late Cenozoic due to the convergence between the African and Eurasian ... [more ▼]

The Moulouya has the largest catchment in Morocco and drains an area which is characterized by active crustal deformation during the Late Cenozoic due to the convergence between the African and Eurasian plates. As yet, its Pleistocene terrace sequence remains poorly documented. Our study focuses on the lowermost reach of the river in NE Morocco, which drains the Triffa sedimentary basin directly upstream of the estuary. New field observations, measurements and sedimentological data reveal contrasted fluvial environments on either side of a newly identified thrust zone, which disrupts the whole sedimentary basin and is associated with N–S compressive shortening in this region. Long-lasting fluvial aggradation, materialized by ≥37 m-thick stacked fill terraces, and the development of a well-preserved terrace staircase, with (at least) three Pleistocene terrace levels, occur in the footwall and the hanging wall of the thrust, respectively. Same as for the Pleistocene terrace sediments of the middle Moulouya, a recurrent sedimentary pattern, characterized by fining-upward sequences was observed in the studied terrace profiles. Assessing the rates of crustal deformation along this main thrust zone requires age estimations for these Pleistocene terrace deposits of the lower Moulouya on each side of the thrust. Samples for luminescence (OSL/IRSL), electron spin resonance (ESR) and cosmogenic nuclide dating (26Al/10Be, burial dating) were collected in terrace deposits located both in the foot- and hanging walls. Sample preparation and analysis as well as age determination are in progress. The preliminary data mentioned above, soon to be completed by chronological data, agree well with morphometric indicators stating that the whole Moulouya catchment is at disequilibrium state (Barcos et al., 2014). This is confirmed by several knickpoints in its longitudinal profile. Late Cenozoic uplift associated with crustal shortening, which occurred in the lowermost reach of the river, may have both hindered profile rectification of the Moulouya and, at the same time, buffered the effects of long-term base-level changes due to eustatic sea-level variations. [less ▲]

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See detailTowards a better understanding of ephemeral stream morphodynamics during the last 100 ka in the vicinity of the prehistoric site of Ifri n’Ammar (Morocco)
Bartz, Melanie; Rhixon; Khel, Martin et al

Conference (2016, April 17)

Our study focusses on the ephemeral stream deposits of Wadi Selloum to reconstruct the palaeoenvironmental evolution in direct vicinity of the rock shelter Ifri n’Ammar. As one of the oldest settlement ... [more ▼]

Our study focusses on the ephemeral stream deposits of Wadi Selloum to reconstruct the palaeoenvironmental evolution in direct vicinity of the rock shelter Ifri n’Ammar. As one of the oldest settlement sites of anatomically modern humans (AMH) in North Africa, Ifri n’Ammar documents periodical occupations since ~170 ka. Since these discontinuous settlement dynamics may be related to or influenced by landscape changes and climate forcing, our study aims (i) to identify phases of morphodynamic activity and stability in the deposits of Wadi Selloum by using micromorphological (sixteen thin sections), sedimentological (laser diffractometry, loss on ignition, magnetic susceptibility), geochemical ( XRF and Scheibler method) and mineralogical (X-ray diffractometry) proxies. Furthermore, (ii) a robust chronology for the ephemeral stream deposits is established by applying a combination of optically stimulated luminescence (OSL) and post infrared stimulated luminescence (pIRIR290) dating. Additionally, one collected pottery shard was dated by thermoluminescence (TL) dating for an inter method comparison. The application of luminescence dating techniques to Wadi Selloum deposits yielded burial ages between 1.3 ± 0.2 ka and 102 ± 8 ka covering different phases of morphodynamically stable and active phases. Enhanced aggradation is evident between ~100 and 60 ka, ~21 and 14 ka and during the Holocene. Overbank fines are distinguished by high amounts of allochthonous minerals such as quartz, muscovite, K-feldspar and plagioclase which give rise to higher eolian activity. This leads to the suggestion that morphodynamical activity was dominant during more arid phases. Landscape stability was observed in form of one palaeosol (2B-2C-sequence; OIS 3) and a recent soil (Ap/Ah-Bw-Bk-BC-C-sequence; after LGM), both attributed to the Calcisol group. Pedogenenesis is evident in thin sections by well-developed subangular blocky peds. The main soil forming process is secondary carbonate precipitation in subsoil horizons, supported by pedofeatures such as calcite infillings and hypocoatings. Holocene deposits (6.4 ± 4 to 1.3 ± 0.2 ka) seem to be affected by short-termed changes between landscape stability and hydromorphic activity due to strong variations in its mineralogical and geochemical characteristics. This is supported by a homogeneous and sterile stratigraphy, as well as an insignificant differentiation in soil horizons with only weakly developed pedofeatures. The sediment characteristics present a weak Ap-C-sequence of a calcaric Fluvisol. After ~1.3 ± 0.2 ka fluvial discharge was reduced and incision took place in the Wadi Selloum. Our study provides first insights in the palaeoenvironment around Ifri n’Ammar during the last glacial interglacial cycle and gives first suggestions about climatic conditions during the time of human occupation in Ifri n’Ammar. [less ▲]

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See detailActualités dans la prise en charge des tendinopathies
Kaux, Jean-François ULg

Conference (2016, April 16)

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See detailDrug-induced thyroid dysfunction
Geenen, Vincent ULg

Conference (2016, April 16)

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See detailHypnose: on it’s very existence
VANHAUDENHUYSE, Audrey ULg

Conference (2016, April 16)

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See detailEffect of wheat-based intercropping systems on pests and natural enemies: a review with a special focus on China
Hatt, Séverin ULg; Chevalier Mendes Lopes, Thomas ULg; Xu, Qinxuan et al

Conference (2016, April 16)

Intercropping is a farming practice consisting of cultivating at least two plant species simultaneously in the same field, but without necessarily sowing and/or harvesting them at the same time. By ... [more ▼]

Intercropping is a farming practice consisting of cultivating at least two plant species simultaneously in the same field, but without necessarily sowing and/or harvesting them at the same time. By increasing plant diversity at the field scale, intercropping may be an efficient method to control insect pests and support natural enemies on the associated crops. We performed a systematic research of the peer-reviewed literature which studied the effect of intercropping systems on pests and natural enemies, compared to pure stands. The research was restricted to wheat-based systems, as it is an important crop worldwide, and the main one in Northern China. A total of fifty research papers were obtained from the literature search. Results from a vote-counting analysis, using binomial tests, indicated that pest abundance was significantly reduced in intercropping systems compared with pure stands, but their natural enemies were not particularly favoured (i.e., predators and parasitoids). Among these papers, 23 were studies from China. There, wheat was associated with cotton in relay-intercropping, as well as alfalfa, chili peppers, fava bean, garlic, mung bean, oilseed rape and pea in strip-cropping. Aphids were systematically reduced and natural enemies (i.e., predators and parasitoids) significantly favoured in intercropping systems compared to pure stands. This study shows that intercropping is a viable practice to biologically control pests, and potentially support natural enemies, especially in China. Therefore it can be seen as a viable method to reduce insecticide use in wheat production systems. [less ▲]

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See detailFirst record of cryptospores in post-Hirnantian (latest Ordovician-early Silurian) sediments from Ethiopia
Brocke, R.; Bussert, R.; Lebenie, D. et al

Conference (2016, April 15)

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See detailThe Prosecution of Grave Crimes as a Global Interest Warranting Lesser Rights for Defendants before International Criminal Tribunals?
Deprez, Christophe ULg

Conference (2016, April 15)

With a view to clarifying the human rights obligations of international criminal tribunals, this presentation addressed the European Court of Human Rights' perspective on whether, in criminal cases, the ... [more ▼]

With a view to clarifying the human rights obligations of international criminal tribunals, this presentation addressed the European Court of Human Rights' perspective on whether, in criminal cases, the gravity of alleged offences may be a relevant factor in determining the scope of defense rights. [less ▲]

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See detailGondwanan Palaeozoic plant spores: A review
Steemans, Philippe ULg; Gerrienne, Philippe ULg

Conference (2016, April 15)

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See detailLe détournement de jeux vidéo : une analyse rhétorique et poétique
Barnabé, Fanny ULg

Conference (2016, April 15)

Le jeu vidéo, né au sein de la culture hacker, est historiquement lié à la pratique du détournement et de la réappropriation. Cette tendance première s’actualise aujourd’hui dans nombre de pratiques qui ... [more ▼]

Le jeu vidéo, né au sein de la culture hacker, est historiquement lié à la pratique du détournement et de la réappropriation. Cette tendance première s’actualise aujourd’hui dans nombre de pratiques qui prolongent le jeu hors de son espace premier et investissent d’autres supports : que l’on pense aux fanfictions, au modding, ou encore aux machinimas, le jeu vidéo est ponctuellement appréhendé par les joueurs non comme une œuvre fermée à consommer, mais comme un outil pour créer à partir de. La présente communication vise donc à étudier les détournements de jeux vidéo d’un point de vue formel, en mesurant et en caractérisant l’écart que ces œuvres « au second degré » construisent par rapport à une pratique consensuelle du jeu. Plus spécifiquement, nous tenterons ici de mettre au jour deux difficultés théoriques propres à l’étude du détournement de pratiques ludiques. [less ▲]

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See detailSwiping or Quoting? Charles Burns’s Cut-Ups of “Old” Comics
Crucifix, Benoît ULg

Conference (2016, April 15)

In Todd Hignite's In the Studio, Charles Burns characterizes a scrapbook put together by his father as one of his “most prized possessions.” The scrapbook contains a collection of various comic strips ... [more ▼]

In Todd Hignite's In the Studio, Charles Burns characterizes a scrapbook put together by his father as one of his “most prized possessions.” The scrapbook contains a collection of various comic strips which his father used for reference when dabbling in cartooning. This scrapbook is a symbol of the close bond between reading, collecting and drawing while underlining the importance of imitation and ‘swiping’ in the production and reception of comics. Burns, whose Tumblr “Johnny 23” could be seen as a digital equivalent to his father's scrapbook, is himself profoundly engaged in ‘swiping’ panels from ‘old’ comics, from American horror and romance comic books to Hergé's Tintin albums. This paper will explore the stakes of ‘swiping’ and quotation in the author's recent production. I will not only focus on his borrowings from Tintin and romance comics for his X'ed Out trilogy, but also on related projects with small-press publishers like Le Dernier Cri, B.ü.l.b. Comix, Cornélius. The way Burns turns to the archive of comics and redeploys it follows the random logic of Burroughs's cut-up technique, which not only recalls the cut-and-paste aesthetics of the scrapbook but is also echoed in the fragmented materiality of the project. However, Burns's cut-ups are not literally ‘cut up’ as much as they are drawn. Elaborating on Philippe Marion's influential concept of “graphiation,” this paper will analyze the citational practice of Charles Burns in medium-specific and historical terms, examining what it means to redraw the past of comics into the contemporary graphic novel. Indeed, how does his work walk the line between ‘individual’ and ‘collective’ graphic styles? How does it play with various conceptions of authorship and how does it negotiate the affects bound up with the appropriated works? [less ▲]

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See detailLe romancier d'aventures se présente. Entre hors-genre et dette générique, note sur un paradoxe de l'éthique paralittéraire
Di Gregorio, Luca ULg

Conference (2016, April 15)

On voudrait ici interroger un trait curieux de l’histoire des catégories populaires du romanesque frappant par son (apparence de ?) paradoxe, et sur lequel il y aurait lieu, semble-t-il, de formuler ... [more ▼]

On voudrait ici interroger un trait curieux de l’histoire des catégories populaires du romanesque frappant par son (apparence de ?) paradoxe, et sur lequel il y aurait lieu, semble-t-il, de formuler quelques remarques. Ce phénomène concerne un discours qu’a pu tenir, de façon récurrente, le roman d’aventures du XIXe siècle à propos de lui-même et de ses romanciers. En effet, ce secteur productif a ressenti très tôt le besoin, d’un côté, de « s’autoriser du voyage » en quelque sorte, en plaçant ses récits, qu’ils soient plus ou moins fantaisistes, sous le signe de l’aventure vécue, de la relation, ou même du travelogue revendiqué (le paratexte, à cet égard, est patent – on en donnera un digest représentatif) ; mais d’un autre côté, à mesure que s’étoffait cette même production, elle voyait s’élever de grands devanciers sous l’autorité desquels pouvaient désormais se positionner des héritiers et/ou épigones à la mémoire plus ou moins heureuse : ainsi, depuis le titre de « Walter Scott américain » décerné à Fenimore Cooper (sans doute le premier cas attesté de notre phénomène), tout le siècle grouillera d’étiquettes accréditantes du même genre, par lesquelles des générations renouvelées de romanciers d’aventures se proposeront au public. Dans le cas de cette quête d’auteurs-garanties, c’est évidemment l’illustration d’un lignage générique qui est poursuivie. Ainsi – sans exhaustivité – parlera-t-on, dans les journaux et les discours périphériques, d’Alexandre Dumas comme du « Walter Scott français », de Gabriel Ferry comme du « Cooper français », de Gustave Aimard, ou même d’Emmanuel Gonzalès (dans la Gazette bibliographique de 1881) selon les cas, comme d’un « Cooper français » ou d’un « Mayne-Reid français » ; de Karl May comme du « Cooper allemand », de Salgari comme du (seul) « Verne italien », et même de Louis Boussenard comme du « Verne beauceron » ( !) Il se tisse là un réseau proliférant de cooptation d’auteurs et d’essais d’affiliation hautement génériques, dont on peut déjà observer, à ces quelques exemples, que ce geste fraye et se reproduit dans toutes les industries paralittéraires d’Europe. Comment le romancier assume-il ce paradoxe ? L’assume-t-il seulement, ou se complaît-il plutôt à jouer sur l’un ou l’autre tableau ? Qui est le romancier d’aventures – ou, plutôt, que veut-il être ? Plus profondément encore : où cette oscillation définitoire – contradictoire – débouchera-t-elle à la fin du siècle, et quel « pêché définitoire originel » dénonce-t-elle aux racines mêmes du roman d’aventures ? Nos remarques procéderont par études de cas précises, en s’efforçant de faire dialoguer ces décorticages particuliers avec la réflexion théorique et les hypothèses de réponses que nous tenterons de formuler. Entre l’ethos du vadrouilleur se disant secondairement écrivain (ou écrivain par accident) et l’héritier générique cherchant son Médiateur à la matière et aux codes indépendants et bien établis, notre argument voudra explorer, en tout cas, un lieu d’intense dialectique dans les dynamiques d’accréditation du récit paralittéraire dixneuvièmiste. [less ▲]

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See detailImpact of wheat bran supplementation to sows on their milk quality, their performances and their progeny’s
Leblois, Julie ULg; Bindelle, Jérôme ULg; Dehareng, Frédéric et al

Conference (2016, April 15)

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See detailEffects of new potential prebiotics on Salmonella Thyphimurium in pigs
Tran, Thi Hanh Tham; Everaert, Nadia ULg; Boudry, Christelle et al

Conference (2016, April 15)

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See detailAnalgesia monitoring
BONHOMME, Vincent ULg

Conference (2016, April 14)

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See detailIntroduction aux échangeurs de chaleur
Declaye, Sébastien ULg; Gendebien, Samuel ULg; Lemort, Vincent ULg

Conference (2016, April 14)

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See detailMC2010 Shear Provisions and Recent Developments in Shear Research
Mihaylov, Boyan ULg

Conference (2016, April 13)

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See detailLes genres du roman au XIXe siècle: introduction
Stienon, Valérie ULg; Pézard, Émilie

Conference (2016, April 13)

Le XIXe siècle a vu s’opérer le « sacre du roman » (Mona Ozouf). La promotion de ce genre anciennement déprécié est liée à l’entreprise de légitimation qu’ont menée, dans leurs œuvres, quelques grands ... [more ▼]

Le XIXe siècle a vu s’opérer le « sacre du roman » (Mona Ozouf). La promotion de ce genre anciennement déprécié est liée à l’entreprise de légitimation qu’ont menée, dans leurs œuvres, quelques grands romanciers du siècle, comme Balzac et Zola. Elle se manifeste aussi par l’augmentation quantitative des romans publiés, la diversification des supports éditoriaux (volumes, feuilletons, recueils) ainsi que celle des modes de diffusion (cabinets de lecture, collections, compilations). Ces différents facteurs induisent une « spécialisation du roman », c’est-à-dire une division du genre romanesque en de multiples sous-genres. Roman noir, personnel, sentimental, historique, d’aventures, de mœurs, de cape et d’épée, mondain, psychologique, scientifique ne sont que quelques-unes des catégories permettant aux contemporains de fragmenter un domaine romanesque devenu immense. Cette multiplication est facilitée par la possibilité de définir un genre à partir de nombreux critères, plus ou moins pertinents. D’autres genres ont été oubliés : qui se souvient du roman ecclésiastique ou du roman militaire ? Alors que de nombreux travaux ont déjà permis de préciser les connaissances sur un genre particulier, nous souhaiterions porter un regard englobant et transversal sur cette division du roman en de multiples genres, qui nous semble constituer un enjeu majeur pour l’étude de la production littéraire au XIXe siècle. [less ▲]

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See detailUltra-narrow superconducting junctions fabricated by controlled electromigration
Silhanek, Alejandro ULg

Conference (2016, April 12)

Superconducting nanowires have been, for years now, a topic of great interest due to their potential application in single photon detectors and in quantum computing circuits. In this context, it is of ... [more ▼]

Superconducting nanowires have been, for years now, a topic of great interest due to their potential application in single photon detectors and in quantum computing circuits. In this context, it is of fundamental importance to better understand the undesired and harmful appearance of thermal and quantum fluctuations of the superconducting order parameter as a function of the wire width. Although superconductors in the mesoscopic regime (i.e. size comparable to ξ and/or λ) have been explored both experimentally and theoretically in depth, the superconducting nanoworld (i.e. at scales of the fermi wavelength) has received much less attention. The lack of experimental results is in part due to the difficulty of sample fabrication, at dimensions beyond the limit reached by conventional lithographic techniques. A promising direction consists of controlling the local displacement of atoms by an electron wind, a process known as electromigration (EM). This effect relies on the combination of local temperature rise and substantial current crowding at nanoconstrictions. While uncontrolled, EM is responsible for the breakdown of small electronic devices, it can be used in a controllable way to further decrease locally the cross section of the nanowire towards single atomic contacts. In this work, we explore in-situ controlled EM to fabricate nano-constrictions immersed in cryogenic environment. We demonstrate that a transition from thermally assisted phase slips (TAPS) to quantum phase slips (QPS) takes place when the effective cross section becomes smaller than ~ 150 nm^2. In the regime dominated by QPS the nanowire loses completely its capacity to carry current without dissipation, even at the lowest possible temperature. We also demonstrate that the bow-tie shaped constrictions exhibit a negative magnetoresistance at low magnetic fields which can be attributed to the suppression of superconductivity in the contact leads. Strikingly, the detrimental effect caused by the repeated EM can be healed by simply inverting the current direction. These findings reveal the strong potential of the proposed fabrication method to explore various fascinating superconducting phenomena in atomic-size constrictions. [less ▲]

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See detailA Refined Method for Estimating the Global Hölder Exponent
Kleyntssens, Thomas ULg; Kreit, Damien; Nicolay, Samuel ULg

Conference (2016, April 12)

We give a wavelet characterization of the generalized Hölder spaces and show how this result can be applied to detect logarithmic corrections appearing in Brownian processes.

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See detailThe body beautiful : Feminist bodies as territories of resistance
Herbert, Emilie ULg

Conference (2016, April 09)

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See detailThe hands of Papyrus Turin 1879: Individualizing handwritings in 20th dynasty hieratic sources
Polis, Stéphane ULg

Conference (2016, April 08)

Papyrus Turin 1879 (and other fragments) — the so-called ‘Map of the gold mines’ or ‘Turin map’ — is among the most famous papyri of the Turin collection, but it was neither systematically published, nor ... [more ▼]

Papyrus Turin 1879 (and other fragments) — the so-called ‘Map of the gold mines’ or ‘Turin map’ — is among the most famous papyri of the Turin collection, but it was neither systematically published, nor studied up until today. Most of the egyptological attention was indeed captured by the ‘map’ side (e.g., Goyon 1949; Harrell & Brown 1992, with previous references), but the other side, which contains many hieratic texts belonging to different genres, has never been examined thoroughly (exceptions are Janssen 1994 and Hovestreydt 1997 for col. 1-2 of frag. A, vo). The goal of this talk is twofold. First, I will provide an overview of the texts found on this papyrus, focusing on the types of hieratic hands. A special attention will be devoted to the repertoire of hieratic signs as well as to the amount of variation in terms of signs formation for a single hand. Second, I will explore the possibility of ‘individualizing’ the hands of this papyrus by connecting their features to other hieratic sources of the 20th dynasty. Harrel & Brown’s (1992) suggestions regarding the attribution of these texts to specific scribes will be challenged and an alternative methodology will be suggested. [less ▲]

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See detailResolving trophic links within temperate eelgrass meadows - use of fatty acids and stable isotopes in MixSIAR mixing model
Jankowska, Emilia; Wlodarska-Kowalczuk, Maria; De Troch, Marleen et al

Conference (2016, April 08)

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See detailImpacts of unusually high sea ice cover on Antarctic coastal benthic food web structure
Michel, Loïc ULg; Dubois, Philippe; Eleaume, Marc et al

Conference (2016, April 08)

Antarctica currently undergoes strong and contrasted impacts linked with climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice ... [more ▼]

Antarctica currently undergoes strong and contrasted impacts linked with climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice cover decrease, the sea ice cover of East Antarctica unexpectedly tends to increase, possibly in relation with changes in atmospheric circulation. Changes in sea ice cover are likely to influence benthic food web structure through modifications of benthic-pelagic coupling, disruption of benthic production and/or modifications of benthic community structure (i.e. resource availability for benthic consumers). Here, we studied shallow (0-20 m) benthic food web structure on the coasts of Petrels Island (Adélie Land, East Antarctica) during an event of unusually high spatial and temporal (two successive austral summers without seasonal break-up) sea ice cover. Using stable isotope ratios of C, N and S and the SIAR mixing model, we examined importance of several organic matter sources (benthic macroalgae, benthic biofilm, sympagic algae, suspended particulate organic matter and penguin guano) for nutrition of over 20 taxa of benthic invertebrates (sponges, sea anemones, nemerteans, sessile and mobile polychaetes, gastropods, bivalves, sipunculids, pycnogonids, amphipods, sea stars, sea urchins and sea cucumbers) spanning most present functional guilds. Our results provide insights about how Antarctic benthic consumers, which have evolved in an extremely stable environment, might adapt their feeding habits in response to sudden man-driven changes in environmental conditions and trophic resource availability. [less ▲]

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See detail"Living on the Edge of Death": Irony in Chris Abani's Song for Night
Tunca, Daria ULg

Conference (2016, April 07)

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See detailHot Melt Extrusion as a New Method to Form Inclusion Complexes with Cyclodextrins
Thiry, Justine ULg; Krier, Fabrice; Ratwatte, Shenelka et al

Conference (2016, April 06)

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See detailNew conservative and regenerative treatments for cartilage and tendon lesions
Kaux, Jean-François ULg

Conference (2016, April 05)

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See detailNovel butanol pretreatment significantly improves delignification and saccharification of different lignocellulosic biomasses
Schmetz, Quentin ULg; Teramura, Hiroshi; Jacquet, Nicolas ULg et al

Conference (2016, April 05)

Organosolv pretreatment using diluted acid and butanol allows the separation of cellulose, hemicelluloses and lignin into three distinct phases. The butanol process has been investigated on six different ... [more ▼]

Organosolv pretreatment using diluted acid and butanol allows the separation of cellulose, hemicelluloses and lignin into three distinct phases. The butanol process has been investigated on six different biomasses: tall fescue, sugarbeet pulp, sugarcane bagasse, beech wood, eucalyptus and Japanese cedar. Dilute acid pretreatment has been performed under similar conditions for comparison. [less ▲]

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See detailComment reconnaître les activités spontanées en EMG
WANG, François-Charles ULg

Conference (2016, April 05)

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