References of "Scientific congresses and symposiums"
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See detailLa démarche RAI, historique, philosophie, outils
Delye, Samuel ULg; Maggi, Patrick ULg; Gosset, Christiane ULg

Conference (2014, April 25)

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See detailHow to locate intermodal terminals for achieving economic and environmental competitiveness?
Mostert, Martine ULg; Limbourg, Sabine ULg

Conference (2014, April 25)

Europe has a strong commitment to the development of competitive and sustainable transportation. An intermediate objective cited in the “White Paper” is to shift 30% of 300 km and above road freight ... [more ▼]

Europe has a strong commitment to the development of competitive and sustainable transportation. An intermediate objective cited in the “White Paper” is to shift 30% of 300 km and above road freight transportation to more environmentally-friendly modes of transport such as rail and water by 2030. Improving and expanding the intermodal network is one way to achieve this goal. However, intermodal transport requires intermodal terminals where the transfer from one mode to another can occur. The location of those terminals is of strategic importance for the competitiveness of intermodal transport. The objective of this paper is therefore to develop a network design model which allows the optimal location of intermodal terminals to be determined, subject to both economic and environmental efficiency. Three possible combinations are considered: (i) Road-only, (ii) Intermodal transport using road (drayage) and rail (long-haul) and (iii) Intermodal transport using road (drayage) and inland waterways (long-haul). External costs are also included in the analysis, i.e. costs that are generated by an economic agent but supported by other agents of the society. This strategy is in line with the willingness of Europe to internalize external costs. The developed model can be used to test how modal split is influenced by the undertaken policies, such as internalizing external costs in the transportation costs. Tests are carried out on the case study of Belgium. [less ▲]

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See detailLes genres en didactique des langues étrangères et en littérature pour la jeunesse. Introduction à la journée du 25 avril 2014.
Simons, Germain ULg; Delbrassine, Daniel ULg

Conference (2014, April 25)

Dans cette brève communication introductive, nous avons d'abord expliqué les objectifs de cette journée sur le genre dans le domaine de la didactique des langues étrangères et de la littérature pour la ... [more ▼]

Dans cette brève communication introductive, nous avons d'abord expliqué les objectifs de cette journée sur le genre dans le domaine de la didactique des langues étrangères et de la littérature pour la jeunesse. Nous avons ensuite dévoilé le programme de la journée. Enfin, nous avons brièvement présenté les deux orateurs extérieurs, Mme M. Jacquin (Université de Genève) et M. H.-H. Ewers (Université de Francfort). [less ▲]

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See detail"Types de productions langagières" et canevas de séquences didactiques en langues modernes
Simons, Germain ULg; Pagnoul, Pierre ULg

Conference (2014, April 25)

Cette communication était structurée en quatre grands volets. Dans le premier, nous avons exploré la notion de "genre" et celle de "type de production langagière" ainsi que leur présence ou absence dans ... [more ▼]

Cette communication était structurée en quatre grands volets. Dans le premier, nous avons exploré la notion de "genre" et celle de "type de production langagière" ainsi que leur présence ou absence dans les prescrits légaux (référentiels, programmes, outils d'évaluation) en langues modernes en Fédération Wallonie-Bruxelles mais aussi dans le Cadre européen commun de référence pour les langues. Dans le deuxième volet, nous avons présenté et analysé le document "Familles de tâches en langues modernes" où apparaît, pour la première fois, la notion de "types de productions langagières à dominante... descriptive/informative, incitative/injonctive, narrative et argumentative", et avons tenté une clarification opérationnelle des notions de genre et de productions langagières en didactique des langues modernes. Dans le troisième volet, nous avons présenté deux canevas didactiques, un linéaire et l'autre par situation-problème, et avons montré en quoi ce dernier se prêtait particulièrement bien au travail sur le genre. Le concept de "noticing the gap" a été ici convoqué et nous avons fourni un exemple de DEBAT organisé avec la technique dite de "l'aquarium", procédé didactique destiné à mettre tous les élèves à la tâche. Enfin, dans le quatrième et dernier volet, nous avons évoqué les problèmes liés à ce champ de recherche sur le genre et avons proposé quelques pistes de solutions. Différentes références bibliographiques relatives aux quatre parties de l'exposé ont également été proposées au terme de la communication. [less ▲]

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See detailExemples de séquences didactiques axées sur différents genres : introduction
Simons, Germain ULg

Conference (2014, April 25)

Cette brève communication visait à introduire et à contextualiser cinq séquences didactiques articulées autour de la notion de genre. Ces séquences, conçues et mises en pratique par d'anciens étudiants de ... [more ▼]

Cette brève communication visait à introduire et à contextualiser cinq séquences didactiques articulées autour de la notion de genre. Ces séquences, conçues et mises en pratique par d'anciens étudiants de l'ULg dans le cadre de l'AESS/du Master à finalité didactique ou du CAPAES, portaient sur le débat régulé (anglais), le reader digest (anglais et néerlandais), l'entretien d'embauche (espagnol), la Kurzgeschichte (allemand), le Krimi (allemand/langue maternelle). Cette introduction a également permis de rappeler les grandes phases du canevas didactique par situation-problème. [less ▲]

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See detailTowards an Archaeological Information System: improving the core data model
Van Ruymbeke, Muriel ULg; Carré, Cyril ULg; Delfosse, Vincent ULg et al

Conference (2014, April 25)

Grounded on archaeological information modeling works undertaken at the Geomatics Unit of the University of Liege, this paper goes a step further in handling time and function imperfection, interpretative ... [more ▼]

Grounded on archaeological information modeling works undertaken at the Geomatics Unit of the University of Liege, this paper goes a step further in handling time and function imperfection, interpretative sequences and people interacting with historical objects. Designed in 2011, the initial model already gathered both geometrical and historical information. It was partially based on the urban data standard City GML mainly for interoperability purposes. Its specificity, the version concept, allowed multiple geometries experiments. That property enabled us to handle geometrical ambiguity and incompleteness. To validate this model, and in a showcase purpose, a first prototype has been realized. One year later this prototype’s model has been improved to manage in a better way all objects’ versions and possible representations. Until now, this model integrates and manages imperfect archaeological data but only partially: the version concept being only dedicated to express geometric ambiguity or imprecision. Henceforth, with the version notion widening, we propose to encompass function and time imperfection as well. It is an important progress because on an archaeological point of view, time and function are quite generally incomplete, uncertain, imprecise or contradictory. Another enhancement must be highlighted: the agent enlistment. Historical characters, on one hand, and contemporaneous people (like authors, archaeologists etc.) on another hand are key elements of archaeological game pieces. Finally, we will describe the way of structuring versions into interpretative sequences. With those improvements, we wish to carry on feeding the scientific debate as much as drafting Archaeological Information Systems. [less ▲]

Detailed reference viewed: 48 (22 ULg)
Peer Reviewed
See detailPredicting Grain Protein Content of Winter Wheat
Mansouri, Majdi ULg; Dumont, Benjamin ULg; Destain, Marie-France ULg

in ESANN 2014 Proceedings (2014, April 24)

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See detailLogistics hub: the case of Liège
Limbourg, Sabine ULg; Mostert, Martine ULg; Paquay, Célia ULg

Conference (2014, April 24)

A logistics hub can be defined as a specific area where all the activities relating to transport, logistics and goods distribution are carried out. With its central location in Europe, highly developed ... [more ▼]

A logistics hub can be defined as a specific area where all the activities relating to transport, logistics and goods distribution are carried out. With its central location in Europe, highly developed infrastructures, airport and inland terminals, the region of Liège claims to be a logistics hub. This paper applies a strategic decision model based on seven relevant criteria (infrastructure, proximity to market, land availability, government and industry support, labour supply, origin/destination distances and congestion) to assess the efficiency of the logistics hub of the region of Liège. Two SWOT analyses are performed in parallel to evaluate the positions of Liège Airport and of the inland freight hub, Trilogiport, in relation to their own performances and the competition. The two main development factors of inland freight hubs are considered: the possibility of modal shift from road transport to more environmentally friendly transportation modes and the avoidance of the congestion of the two seaport areas of Antwerp and Rotterdam. This article concludes by highlighting that the bid of the region of Liège and its characteristics should contribute to a more efficient intermodal transport in Europe, helping to boost the distribution of products, and at the same time, encourage the reduction of greenhouse gas emissions. However, the development of Liège as an inland freight hub depends on its ability to generate a critical mass, notably thanks to the local businesses, in order to realise economies of scale. [less ▲]

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See detailCirculating microRNAs as diagnostic markers in breast cancer patients and their deregulation under neoadjuvant chemotherapy
FRERES, Pierre ULg

Poster (2014, April 24)

Breast cancer is the leading cause of death by cancer among women and there is an urgent need to improve its diagnosis and prognosis. MicroRNAs (miRNAs) are non-coding RNAs that regulate gene expression ... [more ▼]

Breast cancer is the leading cause of death by cancer among women and there is an urgent need to improve its diagnosis and prognosis. MicroRNAs (miRNAs) are non-coding RNAs that regulate gene expression and many have been implicated in breast cancer. In this article, we focus on circulating miRNAs as biomarkers for breast cancers and we describe the deregulation of their expression during neoadjuvant chemotherapy (NAC). [less ▲]

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See detailMachine learning techniques to assess the performance of a gait analysis system
Pierard, Sébastien ULg; Phan-Ba, Rémy; Van Droogenbroeck, Marc ULg

in European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (ESANN) (2014, April 24)

This paper presents a methodology based on machine learning techniques to assess the performance of a system measuring the trajectories of the lower limbs extremities for the follow-up of patients with ... [more ▼]

This paper presents a methodology based on machine learning techniques to assess the performance of a system measuring the trajectories of the lower limbs extremities for the follow-up of patients with multiple sclerosis. We show how we have established, with the help of machine learning, four important properties about this system: (1) an automated analysis of gait characteristics provides an improved analysis with respect to that of a human expert, (2) after learning, the gait characteristics provided by this system are valuable compared to measures taken by stopwatches, as used in the standardized tests, (3) the motion of the lower limbs extremities contains a lot of useful information about the gait, even if it is only a small part of the body motion, (4) a measurement system combined with a machine learning tool is sensitive to intra-subject modifications of the walking pattern. [less ▲]

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See detailEnforcement of accounting standards, financial crisis, and their impact on impairment of non financial assets
Yammine, Mira ULg; Olivier, Henri ULg

Conference (2014, April 24)

The consistent application of IFRS is a concern for the different users of financial statements. In this context this study aims to investigate the impact exercised by the enforcement of accounting ... [more ▼]

The consistent application of IFRS is a concern for the different users of financial statements. In this context this study aims to investigate the impact exercised by the enforcement of accounting standards and the financial crisis on the consistent application of IAS 36 `impairment of assets¿. Listed companies from17 European countries applying IFRS are selected. Two groups of countries are selected based on government indicators namely rule of law, control of corruption, regulatory quality, and government effectiveness. Enforcement of accounting standards is determined from a survey addressed to the institutional oversights bodies that supervise and enforce accounting standards applications in each country. We find that the enforcement of accounting standards has decreased the impairment of assets registrations. But this observation appears to be true only in high government indicators countries. In these same countries the financial crisis has a positive impact on the impairment of assets magnitude. [less ▲]

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See detailIntroduction aux deux journées d'études : "Questions de genres"
Letawe, Céline ULg; Simons, Germain ULg

Conference (2014, April 24)

Lors de cette brève introduction, nous avons a) rappelé les objectifs de l'Entité de recherche structurelle en Langues et littératures modernes de l'ULg ; b) fourni quelques éléments généraux sur l'objet ... [more ▼]

Lors de cette brève introduction, nous avons a) rappelé les objectifs de l'Entité de recherche structurelle en Langues et littératures modernes de l'ULg ; b) fourni quelques éléments généraux sur l'objet de recherche "genre" ; c) présenté le programme complet des deux journées dans les quatre grands domaines : littérature (en ce compris la littérature pour la jeunesse), linguistique, traduction, didactique, et d) remercié les différents partenaires qui ont contribué à la réalisation de ce symposium. [less ▲]

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See detailStudies of the Domains II and III of Bacillus subtilis PBP4a in relation with the protein localization
Vanden Broeck, Arnaud ULg; Van Der Heiden, Edwige ULg; Sauvage, Eric ULg et al

Poster (2014, April 23)

Bacillus subtilis PBP4a belongs to the class-C1 PBPs characterized by two internal additional domains of unknown function. Seven lysine residues (K) are protruding from domain II. Four of them have been ... [more ▼]

Bacillus subtilis PBP4a belongs to the class-C1 PBPs characterized by two internal additional domains of unknown function. Seven lysine residues (K) are protruding from domain II. Four of them have been mutated in glutamine residues (Q). Both proteins (WT and Mut4KQ PBP4a) have been produced without signal peptide in E. coli and their sub-cellular localizations determined by measuring the DD-carboxypeptidase activities in the different compartments (cytoplasmic vs membrane attached proteins). In order to detect a possible influence of the PBP4a domain III in the localization of the protein, its encoding sequence has been cloned into pET-28b-BlaP, a vector allowing the production of WT BlaP β-lactamase or BlaP/DIII chimeric protein (with domain III inserted in a permissive loop of BlaP). The nitrocefin hydrolysis activities of BlaP or BlaP/DIII have been measured in the different cellular compartments. [less ▲]

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See detailSpatio-Temporal Analysis of Equatorial Ionospheric Scintillations in the Frame of Absolute GNSS Positioning Algorithms
Lonchay, Matthieu ULg; Cornet, Yves ULg; Aquino, Marcio et al

Poster (2014, April 23)

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and ... [more ▼]

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and diffraction effects. The ionospheric refraction mainly results in a modification of the propagation speed of the GNSS electromagnetic signals, inducing an error (propagation delay or phase advance depending on the observable) in GNSS measurements. In the frame of absolute positioning techniques, single-frequency algorithms usually exploit an ionospheric model to mitigate the ionospheric error while dual-frequency algorithms, such as the well-known Precise Point Positioning (PPP), take the benefit of the availability of two frequencies and the fact that the ionosphere is a dispersive medium to construct an ionosphere-free mathematical model. But these two strategies are not able to counteract the effect of the ionospheric diffraction which is due to small-scale irregularities in the free electron density. By scattering GNSS signals, these irregularities generate rapid fluctuations (scintillations) in the amplitude and phase of GNSS signals with critical consequences for GNSS applications: cycle slips, signal power fading, receiver loss of lock and poor resulting satellite geometry. The goal of our research is to develop a strategy to mitigate the effect of ionospheric scintillations on absolute GNSS positioning techniques, in particular the SPP (Standard Point Positioning) and the PPP (Precise Point Positioning). The strategy is based on the adjustment of the stochastic model. In order to construct the stochastic model (diagonal and non-diagonal elements) and study the correlation between observables, we adopted a “spatial” and an “empirical” approach. The spatial approach consists in a study of the spatial autocorrelation existing in scintillations effects on GNSS signals. The spatial autocorrelation is detected by using specific spatial analysis techniques applied on data from a network of ISMR (Ionospheric Scintillation Monitoring Receiver) stations located at equatorial and polar latitudes, where scintillations effects are most severe. The knowledge of how scintillation effects are spatially correlated is helpful for determining a coherent stochastic model. The empirical approach does not take into account the phenomenon spatiality and the locations of the measurements but only the observation data. Its objective is to determine the statistical correlation which exists between GNSS measurements during a scintillation event by using a moving filter applied on GNSS observation and scintillation data. The spatial approach exploits data and data locations while the empirical approach is based only the data itself. [less ▲]

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Peer Reviewed
See detailLe psychopathe : apprésentation, chosification de l’alter ego et compétences émotionnelles
Englebert, Jérôme ULg

Conference (2014, April 23)

La psychopathie est une entité diagnostique « trouble », tant au sein de la tradition psychopathologique que dans les nosographies internationales contemporaines (DSM-IV et DSM-V). Le modèle faisant ... [more ▼]

La psychopathie est une entité diagnostique « trouble », tant au sein de la tradition psychopathologique que dans les nosographies internationales contemporaines (DSM-IV et DSM-V). Le modèle faisant autorité en psychologie forensic est celui développé par R.D. Hare (2003) à travers une échelle diagnostique appelée PCL-R. Ce modèle rencontre, d’un point de vue théorique, plusieurs apories, et, d’un point de vue clinique, de nombreuses impasses. Nous proposons de réaliser un exercice de compréhension psychopathologique axé sur notre pratique clinique en nous inspirant des recommandations du courant de la psychopathologie phénoménologique (Minkowski, 1966 ; Binswanger, 1960 ; Stanghellini, 2006 ; Sass, Parnas & Zahavi, 2011). Celui-ci suggère de procéder par la mise en évidence de la structure psychopathologique qui organise le fonctionnement psychologique du sujet. De façon plus précise, nous centrerons notre propos sur deux dimensions essentielles à l’être-au-monde psychopathique. D’une part, nous réaliserons une comparaison avec l’être-au-monde maniaque à travers les variables de l’apprésentation et de la chosification de l’alter ego – telles que les développe Binswanger (1960). Nous discuterons, d’autre part, du vécu émotionnel propre à la psychopathie qui est davantage source d’adaptation (du moins en certaines situations) que de carence véritable. Ce constat nous permettra de rediscuter brièvement de la notion d’empathie en psychopathologie. Nous verrons que ces dimensions propres à l’existence psychopathique font apparaitre une thématique explicitement absente de la nosographie de Hare, celle de la morale. [less ▲]

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See detailLa Belgique, un pays complexe
Hermans, Michel ULg

in Perdigon, Marie-France (Ed.) Actes des VIIème entretiens sur l'identité européenne (2014, April 19)

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See detailRéaction immédiate à l'alcool
LIBON, Florence ULg; DEZFOULIAN, Bita ULg; NIKKELS, Arjen ULg

Poster (2014, April 17)

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See detailStudy of a solar concentrator for space based on a diffractive/refractive optical combination
Michel, Céline ULg; Loicq, Jerôme ULg; Thibert, Tanguy ULg et al

Conference (2014, April 16)

The present work proposes a theoretical optical study of a new planar solar concentrator for space applications. The concentrator focuses light onto three spatially separated photovoltaic cells (three ... [more ▼]

The present work proposes a theoretical optical study of a new planar solar concentrator for space applications. The concentrator focuses light onto three spatially separated photovoltaic cells (three single-junctions, dedicated to two different light spectra), allowing for independent control of the output power of each cell. The design, based on a blazed diffraction grating superimposed on a Fresnel lens, combines advantages of both spectral splitting and light focusing. Theoretical model and optimization of the optical design are presented, including the variation of the grating period along the lens. Numerical results are detailed, highlighting the possibility to design a concentrator at more than 10× for each cell, with an optical efficiency of ~71% and less than 10% of losses for tracking errors < ±0.85°. A thermal study completes the work, as well as a first theoretical comparison with a planar Fresnel based solar concentrator focusing on a GaAs cell. [less ▲]

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See detailThe paravesical and para rectal space, parameter and paracervix
Bonnet, Pierre ULg

Conference (2014, April 15)

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See detailPelvic neuroanatomy
Bonnet, Pierre ULg

Conference (2014, April 15)

Detailed reference viewed: 4 (0 ULg)
See detailThe anatomy of the internal iliac artery
Bonnet, Pierre ULg

Conference (2014, April 15)

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See detailThe vascular anatomy of the para-aortic spaces
Bonnet, Pierre ULg

Conference (2014, April 15)

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See detailImproving our vision on human cadaveric decomposition chemistry
Stefanuto, Pierre-Hugues ULg; Stadler, S; Perrault, K et al

Conference (2014, April 15)

Detailed reference viewed: 15 (2 ULg)
See detailStudy of an undershoot in chlorophyll fluorescence signal after a saturating pulse in PAM measurements
Fratamico, Anthony ULg; Cardol, Pierre ULg; Tocquin, Pierre ULg et al

Conference (2014, April 14)

In 1989, Larcher and Neuner have reported the observation of a sudden reversible drop in modulated chlorophyll fluorescence measurements (PAM) immediately after a saturating pulse, and called it “low ... [more ▼]

In 1989, Larcher and Neuner have reported the observation of a sudden reversible drop in modulated chlorophyll fluorescence measurements (PAM) immediately after a saturating pulse, and called it “low-wave”. 25 years later, whereas some papers reported this phenomenon as a trivial detail, scarcely two works have investigated the origin of this particular signal, in which a link with a low CO2 availability seems clear. Our work on Haematococcus pluvialis, a freshwater green microalga, provides a new point of view on this fluorescence undershoot, caused by a rapidly established non-photochemical quenching. We have demonstrated that in the light-adapted state, a low-wave after a saturating flash can be considered as a consequence of an induction process engaged in response to the brief light increase under low CO2 conditions. The non-photochemical quenching during low-waves was found to be dependent on electron transport to oxygen during the preceding flash. Moreover, in conditions in which low-waves were observed in the light-adapted state, the fluorescence induction kinetics in the first minute of lighting after dark-adaptation presented also a reversible strong drop. Nevertheless, at the stationary state, oxygen production and photochemical yield of photosystem II were not affected. Providing a better understanding of the processes underlying low-waves, our work also draws attention on the effect of CO2 concentration on the onset of photosynthesis. [less ▲]

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See detailThe International Criminal Court as the Principal Authority for Defining the Boundaries of its own Human Rights Obligations
Deprez, Christophe ULg

Conference (2014, April 14)

This paper addresses the applicability of human rights standards to the activity of the International Criminal Court. It argues that, in practice, the Court itself is the key authority when it comes to ... [more ▼]

This paper addresses the applicability of human rights standards to the activity of the International Criminal Court. It argues that, in practice, the Court itself is the key authority when it comes to determining the content of its own human rights obligations. This paradox is due to the fact that the only two legal constructions on which the ICC can convincingly and practically be said to be bound by human rights law – i.e. those that are respectively based on general sources of international law and on the Court’s founding treaty – leave much discretion to the interpreter as to the content of the resulting duties. [less ▲]

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See detailCentral Pelvic spaces: Limits, content & landmarks
Bonnet, Pierre ULg

Conference (2014, April 14)

Detailed reference viewed: 6 (1 ULg)
See detailThe path of the ureter
Bonnet, Pierre ULg

Conference (2014, April 14)

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See detailPelvic anatomy, a constructive approach
Bonnet, Pierre ULg

Conference (2014, April 14)

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See detailAnterolateral inferior abdominal wall anatomy: nerves and vessels.
Bonnet, Pierre ULg

Conference (2014, April 14)

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See detailCumulative effect of Aox1 inactivation and N source modulation on the cellular proteome of Chlamydomonas reinhardtii - New insights in the metabolic interconnexion between respiration and photosynthesis
Gerin, Stéphanie ULg; Mathy, Grégory; Franck, Fabrice ULg

Conference (2014, April 14)

In Chlamydomonas reinhardtii, the Aox1 gene encoding the mitochondrial alternative oxidase (AOX) is tightly regulated by the N source: its transcription is stimulated by nitrate and repressed by ammonium ... [more ▼]

In Chlamydomonas reinhardtii, the Aox1 gene encoding the mitochondrial alternative oxidase (AOX) is tightly regulated by the N source: its transcription is stimulated by nitrate and repressed by ammonium. AOX has been proposed to play a key role in regards to the N source by acting as a trigger factor for the TCA cycle to promote the production of reduced cofactors which, together with photo-generated reductant, could contribute to support nitrate assimilation. In the present work, the cellular proteomes of wild-type and AOX-deficient strains grown either on nitrate or ammonium in the presence of acetate have been compared using two dimensional-differential in-gel electrophoresis (2D-DIGE) coupled to hierarchical clustering and ANOVA-2 statistical analyses in order to further investigate the physiological role(s) of AOX, particularly in regards to the N source. The dramatic up-regulation of chloroplastic components of the carbon-concentrating mechanism (CCM) in response to Aox1 inactivation importantly suggests that AOX plays a key role in the CCM in both N sources by allowing the production of CO2 through the TCA cycle. The concomitant down-regulation of photorespiratory enzymes in cells lacking AOX indicates that such an induction of the CCM could actually be sufficient to over-compensate the effects of AOX deficiency on CO2 availability in the local environment of Rubisco and maintain high rates of inorganic carbon fixation despite lower TCA cycle-mediated CO2 production. The global overexpression of diverse photosynthetic chain and Calvin cycle components in cells lacking AOX further evidences that a tight functional relationship exists between mitochondrial and chloroplastic processes of energy transduction, and that there could be a global redirection of bioenergetics towards photosynthesis to limit the harmful consequences (particularly oxidative stress) of mitochondrial deficiency. The observation that numerous N-responsive proteomic modifications are strongly attenuated (or even abolished) in response to Aox1 inactivation supports that AOX also exerts a more specific role as a central effector of the metabolic plasticity induced by modulating the N source in the growth medium. Our proteomic results tend notably to confirm that respiration (through AOX activity) and photosynthesis collaborate to provide nitrate reduction with electrons in mixotrophic condition and that acetate oxidation could be promoted to support AOX involvement in this context. [less ▲]

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See detailWhat about Google Scholar when searching information in Human and Physical Geography?
Stirbu, Simona ULg

Conference (2014, April 12)

This study focuses on four bibliographic tools and aims to highlight what the use of the Google Scholar search engine can yield, in comparison with three commercial bibliographical databases: the well ... [more ▼]

This study focuses on four bibliographic tools and aims to highlight what the use of the Google Scholar search engine can yield, in comparison with three commercial bibliographical databases: the well known multidisciplinary database Web of Science (WoS); GeoRef, a specialized data base in geosciences; and FRANCIS, which includes international geographical bibliography. To identify the bibliographic references published yearly between the years 2005 to 2009, ten keywords placed between quotation marks have been searched through the title field of the search tool interfaces. On a monthly basis, from November 2010 to July 2011, an identical process was repeated to get some information on the repeatability of the searches. Initially the whole set of results was analysed, and then the search results of two keywords were studied in more details. The results indicate that GS provides a high overlap with the search results of the other databases, but also yields numerous unique hits. Moreover, it seems that it is also able to find diverse types of literature, while the others are more specialized. [less ▲]

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See detailXenogeneic GVHD in NSG mice: focus on rapamycin
Ehx, Grégory ULg

Conference (2014, April 11)

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See detailLe pilotage par les chiffres de la politique sportive belge francophone
Zeimers, Géraldine ULg

Conference (2014, April 10)

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See detailPhylogenetic study of Aedes albopictus and Aedes koreicus (Diptera, Culicidae) origin, two invasive mosquito species in Belgium
Raharimalala, Fara Nantenaina ULg; Boukraa, Slimane ULg; Bawin, Thomas ULg et al

Poster (2014, April 10)

The main ways of the introduction of invasive mosquito species in Europe were greatly facilitated by the importation of used tires and plants from the South of China (Dracaena sanderiana, called "Lucky ... [more ▼]

The main ways of the introduction of invasive mosquito species in Europe were greatly facilitated by the importation of used tires and plants from the South of China (Dracaena sanderiana, called "Lucky bamboo"), which are a very good breeding sites of these mosquitoes (www.eidatlantique.eu). For Belgium, several species of exotic mosquitoes have already been listed such as Ochlerotatus japonicus japonicus, Aedes albopictus and A. koreicus. We have captured one male of A. albopictus in Belgium in July 2013 (Boukraa et al, 2013), and teams from other entomologist have been able to find several individuals in the months that have followed our discovery (personal communication). However, his presence was reported first in 2000 (Schaffner et al. 2004) but until 2012, no individuals have been found (Versteirt et al., 2013). We also could find larvae of A. koreicus in abundance. These discovery suggest that these two invasive species are being established in Belgium. Methods: Adult mosquitoes were collected by CO2-baited traps Mosquito Magnet Liberty Plus (MMLP) and immature stages by the dipping method from 8 sites of Belgium. Each individual was then determined morphologically. For A. albopictus and A. koreicus, reconfirmation by molecular method was performed with COI and ND5 mitochondrial primers and sequences were then aligned with those of mosquitoes available in databases by using BioEdit and Multialn softwares. The two gene sequences were concatenated to improve the reliability of the phylogenetic analysis and were carried out by using the Seaview software based on maximum likelihood (ML) methods. Trees were then constructed with the general time reversible (GTR) model, and branch supports were estimated by bootstrapping with 1000 replicates. Result: The aim of this work will focus on the study of the probable origin of these two species of Aedes, which are for the moment safe yet, but that might become dangerous in the event of massive outbreak. The knowledge of the probably origin of the two invasive mosquitoes allow take more protection against their way to enter in the country. [less ▲]

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See detailLo sviluppo socio-emotivo dei bambini adottati da coppie omosessuali in Europa
Messina, Roberta ULg; D'Amore, Salvatore ULg; J-Green, Robert

Poster (2014, April 10)

L’adozione da parte di coppie omosessuali, legale in 9 paesi europei, provoca molte reazioni nell’opinione pubblica. Il dibattito oppone il “diritto al bambino”, reclamato dagli omosessuali, al “diritto ... [more ▼]

L’adozione da parte di coppie omosessuali, legale in 9 paesi europei, provoca molte reazioni nell’opinione pubblica. Il dibattito oppone il “diritto al bambino”, reclamato dagli omosessuali, al “diritto del bambino” di crescere al sicuro da ogni forma di stigmatizzazione. La presente ricerca, pionieristica nel contesto europeo, mira ad approfondire lo sviluppo socio-emotivo dei bambini adottati da coppie dello stesso sesso. L’obiettivo è rispondere all’interrogativo soggiacente al dibattito sociale: “inserire un bambino, già segnato da un abbandono, in una famiglia che rappresenta un nuovo “cantiere sociale” può comportare delle ripercussioni sul suo benessere psicologico?”. Recruteremo circa 200 famiglie adottive, metà omogenitoriali e metà eterogenitoriali; per ogni famiglia, i dati saranno raccolti tramite tre fonti di informazione: i genitori, il bambino e un suo insegnante. La ricerca, condotta inizialmente in Olanda, Belgio, Spagna e Inghilterra, sarà poi diffusa negli altri paesi europei. [less ▲]

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See detailSame-sex parenting is legal in Belgium but some heterosexuals support it and others don't: why?
Scali, Thérèse ULg; D'Amore, Salvatore ULg; Green, Robert-Jay

Poster (2014, April 10)

Gays and Lesbians represent between 7 and 10% of the Belgian population, this means 1 million of citizens. Notwithstanding the large number of civil rights granted to homosexuals and the anti ... [more ▼]

Gays and Lesbians represent between 7 and 10% of the Belgian population, this means 1 million of citizens. Notwithstanding the large number of civil rights granted to homosexuals and the anti-discrimination laws, the issue of social acceptance of same-sex couples and families remains. However, the attitude of the population (support vs. rejection and discrimination) and the marginalization of a minority influence not only their quality of life but also their couple and parenting skills and the development of their children (Armesto, 2002; Goldberg, 2010). Results show that attitudes towards same-sex parenting can be explained by four categories of arguments: arguments regarding children well-beeing, religious and political arguments, contact and experiential arguments and traditional arguments. [less ▲]

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See detailHabitat use of a population of bottlenose dolphins, Tursiops truncatus gephyreus, analyzed by means of Kernel Density Estimation (KDE) method
Cransveld, Alice ULg; Denoël, Mathieu ULg; Das, Krishna ULg et al

Poster (2014, April 09)

The San Antonio Bay (SAB), in Patagonia, Argentina, harbors a resident population of bottlenose dolphins (Tursiops truncatus gephyreus). It seems a privileged area to give birth and nurse calves. In the ... [more ▼]

The San Antonio Bay (SAB), in Patagonia, Argentina, harbors a resident population of bottlenose dolphins (Tursiops truncatus gephyreus). It seems a privileged area to give birth and nurse calves. In the context of declining populations worldwide and more particularly in South America, preserving the SAB population takes a considerable significance. Yet the SAB is facing human population growth and touristic development, which represent potential threats for the dolphin population, especially dolphin-watching activities. In this context, the aim of this study was to understand the bottlenose dolphin’s habitat use within the bay, and to consider how this information could be used in prospective management strategies. Particularly, we aimed at using the Kernel Density Estimation (KDE) method to map the intensity of space use for essential behavioural patterns. To this end, we collected behavioural information on dolphins during 25 boat-based surveys in the bay in 2011. The habitat use of the bay was heterogeneous: some areas were more intensely used than others. Dolphins spent most of their time traveling and diving. Variables associated to resting behaviours, e.g. school size and depth, indicated that the SAB would be a safer place compared to other known residency areas, confirming its suitability for conservation purposes. KDE analyses showed that behaviours are not evenly distributed inside the bay. Bottlenose dolphins being more sensitive to anthropogenic disturbances while engaged in resting or socializing behaviours, it is crucial to locate these behaviours. In SAB, the KDE shows that resting and socializing areas are located in the Northern part of the bay, indicating that it should constitute a priority protected area in potential future management strategies. Furthermore, our results show that the KDE method is an appropriate and advantageous tool when determining critical habitats, worth being more widely used. [less ▲]

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See detailMultitasking capacities in persons diagnosed with schizophrenia: A preliminary examination of their neurocognitive underpinnings and ability to predict real world functioning
Laloyaux, Julien ULg; Van der Linden, Martial ULg; Levaux, Marie-Noëlle ULg et al

Poster (2014, April 08)

Background: Difficulties in everyday life activities are core features of persons diagnosed with schizophrenia. Moreover, patients seem to demonstrate particular difficulties during complex and ... [more ▼]

Background: Difficulties in everyday life activities are core features of persons diagnosed with schizophrenia. Moreover, patients seem to demonstrate particular difficulties during complex and multitasking activities, such as cooking a meal (Semkovska et al., 2004). Multitasking refers to activities where the person has to: carry out and alternate between different tasks that vary in terms of priority, difficulty and duration; define the tasks’ targets; and where the person is faced with unexpected problems during the realization of these tasks (Burgess, 2000). However, at present, patients’ multitasking capacities have not been adequately examined in the literature due to an absence of suitable assessment strategies. We thus recently developed a computerized real-life activity task designed to take into account the complex and multitasking nature of certain everyday life activities where participants are required to prepare a room for a meeting – the Computerized Meeting Preparation Task (CMPT) Methods: Twenty-one individuals diagnosed with schizophrenia and 20 matched healthy controls completed the CMPT. During the CMPT, participants found themselves in a virtual room that they had to prepare for a meeting while respecting a list of instructions (the placement of the guests, the needed objects, the desired drinks, etc.). Patients were also evaluated with an extensive cognitive battery (assessing executive functions, attention, processing speed and memory), measures of symptomatology and real world functioning. To examine the ecological validity of the CMPT, 14 others patients were recruited and were given the computerized version and a real version of the meeting preparation task. Results: Results demonstrated that performance on the CMPT significantly differentiated patients and healthy controls for the total time to complete task, planning efficiency, and the respect of the instructions. Moreover, these variables were significantly correlated with executive functioning (i.e. cognitive flexibility and planning), suggesting the major implication of these cognitive processes in multitasking activities. Performance on the CMPT also significantly predicted up to 50% of real world functioning. Finally, performances on the computerized version and the real version of the meeting preparation task were highly correlated, suggesting good ecological validity. Discussion: In this study, we created a novel task involving the multitasking nature of real world activities. The results demonstrated that this approach provides a good indication of the real world functioning in patients diagnosed with schizophrenia. Moreover, results suggest a particular implication of executive functioning in multitasking activities. These findings suggest the importance of evaluating multitasking capacities in patients diagnosed with schizophrenia in order to predict real world functioning. [less ▲]

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See detailProbing the conformational changes during desolvation of ions using orthogonal mobility methods (CE-IMS)
Far, Johann ULg; Kune, Christopher ULg; Delvaux, Cédric ULg et al

Poster (2014, April 08)

The transfer of ions from the solution to the gas phase is a critical step to produce « native species ». Coming from a highly solvating medium, ionic species will tend to find a new equilibrium ... [more ▼]

The transfer of ions from the solution to the gas phase is a critical step to produce « native species ». Coming from a highly solvating medium, ionic species will tend to find a new equilibrium conformation in the gas phase. The pathway to reach the thermodynamically stable conformation involves crossing potential barriers of different heights. When these barriers are too high compared to the internal energy of the ions, it will result in “partial memories” (as structural preservation) of the conformation in solution. In order to evaluate the effect of the solvent evaporation and of the various collision processes encountered by the ions in the mass spectrometer. The strategy consists in comparing in a single experiment the shape of the ions in solution and in the gas phase. Data are obtained by coupling capillary electrophoresis with Ion Mobility Mass Spectrometry. Drift times in solution and in the gas phase are directly compared. Deviations from their correlation points out changes in folding upon desolvatation. Preliminary results show that among peptides issued from tryptic digest of BSA some of them clearly change their conformation during desolvatation. This work intends to evaluate the extent of conformational “memory” of the ions of different nature for best experimental condition allowing “native mass spectrometry”. [less ▲]

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See detailElectromagnetic hypersensitivity and occupational exposure to electromagnetic fields (EMF)
Demaret, Isabelle ULg

Conference (2014, April 07)

Introduction Scientific publications on electromagnetic hypersensitivity began in the early 80' and were first related to video display terminals in the professional environment. Electromagnetic ... [more ▼]

Introduction Scientific publications on electromagnetic hypersensitivity began in the early 80' and were first related to video display terminals in the professional environment. Electromagnetic hypersensitivity is now more heterogeneous and complaints about electromagnetic fields (EMF) are often associated to mobile phone or wifi. Provocation studies did not find that persons claiming to have electromagnetic hypersensitivity were more able to detect EMF than others or that they displayed any special physiological changes when exposed to EMF. Since 1996, WHO defined this syndrome as Idiopathic Environmental Intolerance to ElectroMagnetic Fields (IEI-EMF), characterised by symptoms attributed to EMF. The diagnostic is made by the person itself. The symptoms are heterogeneous and are frequently encountered in the general population. Despite the lack of a proven causal relationship with EMF, these symptoms, and the anxiety related, can lead to important suffering. Some persons with IEI-EMF are even unable to work. IEI-EMF is classified among the functional somatic syndromes as other syndromes with no physiological basis (as multiple chemical sensitivity). Directive and IEI-EMF Studies showed that persons who feel more stressed in their professional environment and are less satisfied with their work are more prone to IEI-EMF. There are some elements in the directive that could frighten these persons: the directive does not consider long term effects; the limit values can be exceeded temporarily and a worker must be informed that he can have transient symptoms. Discussion Persons with IEI-EMF are afraid of adverse health effects and often think that these effects are not taken into account by official agency. For them, everything that can aggravate their fears will be difficult to handle. [less ▲]

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See detailEfficacité des interven8ons langagières basées sur la guidance parentale : qu’en est- il pour les popula8ons de faible statut socio-économique (SSE)?
Maillart, Christelle ULg; Martinez Perez, Trecy ULg; Jidovtseff, Boris ULg et al

Poster (2014, April 07)

Le développement langagier de l’enfant est fortement influencé par le statut socio-économique (SSE). Dès le plus jeune âge, les enfants issus de milieux défavorisés présentent un retard langagier ... [more ▼]

Le développement langagier de l’enfant est fortement influencé par le statut socio-économique (SSE). Dès le plus jeune âge, les enfants issus de milieux défavorisés présentent un retard langagier objectivable (Hoff, 2012). La qualité et la quantité du langage adressé à l’enfant sont des variables médiatrices dans l’impact du SSE (Hoff, 2003). Une méta-analyse a mis en évidence l’efficacité des interventions langagières ciblées sur l’enrichissement du langage adressé à l’enfant (Robert & Kaiser, 2011). Toutefois, les études d’intervention ont principalement porté sur des enfants issus de SSE moyen : il est difficile d’en généraliser la portée aux populations plus défavorisées. Cette étude randomisée contrôlée évalue l’efficacité d’une intervention ciblée sur le langage adressé à l’enfant dans des populations de faible SSE. Participants Quatre-vingt-seize enfants âgés de 18 à 30 mois et de faible SSE ont été recrutés au sein de 10 consultations enfants organisées par l’Office de la Naissance et de l’Enfance, en Belgique. Dans 5 de ces 10 consultations, une intervention portant sur la stimulation langagière a été proposée. Dans les 5 autres, une intervention en psychomotricité a été mise en place. Les deux interventions se déroulent en groupe (une dizaine d’enfants et leur parent) et sont appariées en termes de fréquence (1 heure par semaine) et de durée (15 semaines). Une évaluation individuelle a été proposée avant l’intervention (T1), après l’intervention (T2) et 6 mois après la fin de l’intervention (T3). Chaque testing évaluait les développements cognitif, langagier et psychomoteur de l’enfant et comportait une interaction filmée parent-enfant en situation de jeu afin d’analyser le langage adressé à l’enfant et les comportements parentaux. Principaux résultats Les résultats mettent en évidence l’efficacité et la spécificité de l’intervention langagière proposée, tant au niveau du langage des enfants que des modifications du comportement parental. [less ▲]

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See detailCaractérisation de la sève du palmier dattier
Makhlouf-Gafsi, Inès; Mokni-Ghribi, Abir; Attia, Hammadi et al

Conference (2014, April 07)

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See detailEffet des conditions d'extraction sur la composition et les activités antioxydantes des ulvanes de l'algue Ulva lactucas
Yaich, Hela; Garna, Haikel; Paquot, Michel ULg et al

Conference (2014, April 07)

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See detailEnzymatic process for the fractionation of baker's yeast cell wall (saccharomyces cerevisiae)
Borchani, Chema; Fonteyn, Fabienne; Jamin, Guilhem et al

Conference (2014, April 07)

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See detailFonctionnalisation des matières grasses alimentaires
Danthine, Sabine ULg; Blecker, Christophe ULg

Conference (2014, April 07)

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See detailAccumulation lipidique par Yarrowia lipolytica: un nouvel outil d'observation
Bouchedja, Doria Naïla; Delvigne, Frank ULg; Boudjellal, Abdelghani et al

Conference (2014, April 06)

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See detailEffet du traitement enzymatique sur la composition en polyphénols et sur le pouvoir antioxydant du sirop de dattes
Abbès, Fatma; Wissal, Kchaou; Blecker, Christophe ULg et al

Conference (2014, April 05)

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See detailModélisation de l'attitude des médecins généralistes envers la prévention
Vanmeerbeek, Marc ULg; Giet, Didier ULg; Quittre, Valérie ULg et al

Conference (2014, April 05)

Objectifs En Belgique, la mise en œuvre des procédures préventives reste insuffisante et inéquitable dans plusieurs domaines. Les médecins généralistes (MG) sont-ils désireux de participer à ... [more ▼]

Objectifs En Belgique, la mise en œuvre des procédures préventives reste insuffisante et inéquitable dans plusieurs domaines. Les médecins généralistes (MG) sont-ils désireux de participer à l’amélioration de cette situation ? Méthode Un questionnaire postal a été envoyé à un échantillon aléatoire de 2.500 généralistes, répartis entre Flandre, Wallonie et Bruxelles. L’opinion des MG a été évaluée au moyen d’une échelle d’attitude. Cinq axes définis par une enquête qualitative préalable ont été explorés : vision globale de la santé, stratégies de prévention collectives, évaluation de pratique, collaboration interprofessionnelle et santé publique. Un consensus d’experts a défini les « meilleures » réponses aux échelles de Likert. Les résultats ont été soumis à une analyse factorielle exploratoire, puis à une analyse « Item Response Theory (IRT) » adaptée au traitement de réponses catégorielles (d’accord – pas d’accord). Résultats Les 457 réponses reçues ont été analysées pour modéliser l’attitude des MG ; trois dimensions ont été isolées : • Evaluation : positionne les MG selon leur souci à pratiquer une technique d’évaluation, à travailler par objectifs ou gérer leur base de données cliniques. • Responsabilité : attitude des MG qui se sentent responsables de la santé de leurs patients, ou qui organisent les conditions matérielles et relationnelles pouvant contribuer à son maintien. • Compétences professionnelles particulières : positionne les MG selon leur utilisation de plusieurs compétences « mineures » : acquisition et mise en pratique de l’information scientifique, délimitation des compétences entre praticiens et autorités de santé publique, délégation de tâches à des paramédicaux. Conclusion Une diffusion plus large et équitable des actes préventifs passe par la prise en compte de facteurs personnels et organisationnels propres aux MG. Leur distribution parmi les MG est probablement hétérogène, et leur degré d’acceptabilité variable. Une étude plus approfondie de la population des MG belges serait nécessaire. [less ▲]

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See detailDevelopmental Invariance in Implicit Sequence Learning
Lejeune, Caroline ULg; Wansard, Murielle ULg; Meulemans, Thierry ULg

Poster (2014, April 05)

This study was intended to test the age invariance hypothesis on implicit learning abilities using the serial reaction time paradigm and focusing on the comparison of second-order conditional (SOC ... [more ▼]

This study was intended to test the age invariance hypothesis on implicit learning abilities using the serial reaction time paradigm and focusing on the comparison of second-order conditional (SOC) sequences of two different lengths (8 and 12 elements). A total of 128 participants from 4 age groups (4 years, 7 years, 10 years, and adults) were tested. The results showed significant and similar learning effects in 4-, 7-, and 10-year-old children, as well as adults. The learning effect was more pronounced for the 8-element sequence than for the 12-element sequence for all age groups, suggesting that the shorter sequence was better learned than the longer one. In addition, the degree of explicit sequence awareness was comparable between age groups and sequence lengths. These results, showing that 4-year-old children are able to learn 8- and 12-element-long SOC sequences as well as adults, provide further support for the hypothesis that implicit learning abilities are developmentally invariant. [less ▲]

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See detailLiquidity Constraints and Global Imbalances
Artige, Lionel ULg; Cavenaile, Laurent

Conference (2014, April 05)

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See detailCARACTERISATION MINERALOGIQUE, GEOCHIMIQUE ET GEOTECHNIQUE DES MATIERES PREMIERES UTILISEES DANS LE SITE POTIER D’AGAFAY (MARRAKECH, MAROC).
El Boudour El Idrissi, Hicham ULg; Daoudi, Lahcen; El Ouahabi, Meriam ULg et al

Conference (2014, April 04)

Le site potier d’Agafay est localisé à 20 km au Sud-Ouest de la ville de Marrakech. Le site comporte environ 240 artisans répartis sur 90 ateliers. Les principales pièces produites sont les gasriyas (i.e ... [more ▼]

Le site potier d’Agafay est localisé à 20 km au Sud-Ouest de la ville de Marrakech. Le site comporte environ 240 artisans répartis sur 90 ateliers. Les principales pièces produites sont les gasriyas (i.e., plats traditionnels de couscous et de modelage de pâtes de pains) et les briques traditionnelles. Les matières premières utilisées, brutes ou en mélange, sont issues des terres agricoles locales (Ag1 et Ag5) pour les gasriyas et des dépôts actuels de l’oued N’Fis (Ag7) pour les briques. Les défauts rencontrés dans la production diffèrent selon le type de produit confectionné et selon le type de matière première utilisée. La qualité des produits confectionnés à partir de Ag1 et Ag5 est altérée par la présence de grains de chaux qui gonflent après refroidissement des tessons cuits ; ce qui engendre des décollements dans les tessons et nuit à la qualité du produit final. Par ailleurs, les briques confectionnées à partir de Ag7 se caractérisent par une très grande variation de couleur, ce qui est du à une mauvaise cuisson et à une distribution non homogène de la chaleur à l’intérieur des fours traditionnels utilisés ; certaines briques sont totalement fondues. De plus les briques présentent généralement des torsions qui peuvent débuter après le cycle de séchage, mais qui s’amplifient après la cuisson. Notre étude vise à une caractérisation scientifique des différentes phases de fabrication afin de remédier à ces problèmes. Les résultats des analyses montrent que la composition chimique de l’ensemble des matières utilisée est surtout silico-alumineuse (55 à 61 % de SiO2 ; 16 à 20% d’Al2O3), la teneur en Fe2O3 se situe entre 6 et 8 %, celle de CaO ne dépasse pas 6% pour les pâtes des gasriyas et atteint 10 % pour les pâtes des briques. La teneur en carbonates varie de 5 à 14 %, alors que celle de la matière organique est comprise entre 5 et 7,5 %. L’indice de plasticité oscille entre 16 et 17,5. Pour des teneurs en eau proches de la limite de plasticité le degré de retrait au séchage des gasriyas est de l’ordre de 5 %, il est plus élevé pour les briques (8%) ce qui nécessite une plus grande maitrise du processus de séchage pour éviter que les pièces ne se tordent. La granulométrie des pâtes utilisées pour les gasriyas a montré une teneur moyenne de 50 % pour les argiles, 32 % pour les limons et 18 % pour les sables. Les briques comportent une proportion à peu prés équivalente des trois classes granulométriques. La minéralogie de l’ensemble des pâtes est formée de quartz (< 27%), plagioclase (13%), calcite (7 à 9%), dolomite (5%) et argile (50% pour Ag1 et Ag5, 34% pour Ag7). Le feldspath potassique est présent uniquement dans l’échantillon Ag7. Concernant la fraction argileuse, l’illite est dominante pour l’ensemble des pâtes ; elle est associée à des interstratifiés irréguliers 14c-14s (environ 13 %) pour la pâte des briques et à des smectites (environ 11 %) pour la pâte des gasriyas (Ag5). La mesure de la vitesse sonique a montré que les pièces formées par pression aboutissent à une porosité moindre que celle des pièces produites par boudinage. La densité des pièces produites reste semblable pour les cuissons à 950°C et 1050°C. Le plus bas degré de porosité ainsi que les plus grandes valeurs de résistance mécanique à la compression ont été enregistrés sur les pièces cuites à 1050 °C. Les contraintes maximales atteintes se situent entre 51 et 59 MPa pour les gasriyas et 24,5 MPa pour les briques. Quant à la résistance mécanique à la flexion, elle varie entre 17,4 et 20,3 N/mm² pour les gasriyas et 9,4 N/mm² pour les briques. L’analyse DRX des pièces cuites à 1050 °C a montré la disparition totale des carbonates et des argiles à cette température, accompagnée de l’apparition de la géhelénite, cristobalite, anorthoclase, diopside, spinelle et hématite. A l’issue de cette étude, nous recommandons un tamisage humide à 1 mm pour réduire l’effet des grains de chaux, un cycle de séchage plus adéquat, une cuisson par palier jusqu’à 1050°C et l’utilisation de fours qui garantissent une meilleure distribution de la chaleur. [less ▲]

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See detailRapports de forces et conflits : « la question balkanique »
Lika, Liridon ULg

Conference (2014, April 04)

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See detailUse of on-line flow cytometry for the characterization of microbial stress dynamics during the bioprocess
Brognaux, Alison ULg; Han, Shanshan; Sorensen, Soren et al

Conference (2014, April 03)

Microbial cell population heterogeneity is now recognized as a major source of issues for the development and optimization of bioprocesses. Flow cytometry is a very powerful tool for the follow up of ... [more ▼]

Microbial cell population heterogeneity is now recognized as a major source of issues for the development and optimization of bioprocesses. Flow cytometry is a very powerful tool for the follow up of physiological properties of microbial cells in process-related conditions at the single cell level, and can be used to study the dynamics of segregation directly in bioreactors. In this context, specific interfaces have been developed in order to connect flow cytometer (FC) directly on bioreactor for automated analyses. In this work, we propose a simplified version of such interface and demonstrated its usefulness for multiplexed experiments. This automated FC system has been tested for the follow up of the dynamics of an E. coli pfis::gfpAAV fluorescent bio-reporter and its PI uptake, correlated with membrane permeability. This bioreporter is composed of a fis promoter, a growth dependent promoter-indicator of the nutrient status of cells, fused to a gene expressing an unstable variant of GFP. The results obtained showed that the dynamics of the GFP synthesis is complex and can be attributed to a complex set of biological parameters. Segregation in the membrane permeability has been noticed. This work demonstrates that a simplified version of on-line FC can be used at the process level for the investigation of the dynamics of complex physiological mechanisms. [less ▲]

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See detailCaractérisation minéralogique, géochimique et géotechnique des matières premières utilisées en poterie dans le site d’Agafay, Marrakech, Maroc.
El Boudour El Idrissi, Hicham; Daoudi, Lahcen; El Ouahabi, Meriam ULg et al

Conference (2014, April 03)

Le site potier d’Agafay est localisé à 20 km au S-W de la ville de Marrakech, à l’ouest de l’oued N’Fis. L’activité potière y a débuté par transfert du savoir-faire à partir du village de Tamsloht vers ... [more ▼]

Le site potier d’Agafay est localisé à 20 km au S-W de la ville de Marrakech, à l’ouest de l’oued N’Fis. L’activité potière y a débuté par transfert du savoir-faire à partir du village de Tamsloht vers 1940 apr. J.-C. Le site comporte environ 90 ateliers où sont actifs 240 artisans. Les principales pièces produites sont les gasriyas (i.e., plats traditionnels de couscous et de modelage de pâtes de pains) et les briques des grandes murailles traditionnelles. Les matières premières utilisées, brutes ou en mélange, sont issues des terres agricoles locales (Ag1 et Ag5) pour les gasriyas et des dépôts actuels du oued N’Fis (Ag7) pour les briques. Les problématiques rencontrées dans ce site concernent les deux types de produits, gasriyas et briques. Dans le premier cas, des grains de la chaux gonflent dans les pièces après le contact prolongé des pièces produites avec l’air. Ce gonflement engendre des décollements dans les tessons et nuit à la qualité du produit final. Dans le deuxième cas, la distribution non homogène de la chaleur à l’intérieur des fours traditionnels utilisés engendre une très grande variation de couleur dans les briques, elles sont généralement tordues et certaines fondent totalement. Notre projet vise à une caractérisation scientifique des différentes phases de fabrication afin de remédier à ces problèmes. Les résultats montrent que la composition chimique est surtout silico-alumineuse (55 à 61 % de SiO2 ; 16 à 20% d’Al2O3), la teneur en Fe2O3 se situe entre 6 et 8 %, celle de CaO ne dépasse pas 6% pour les pâtes des gasriyas et atteint 10 % pour les pâtes des briques. La teneur en carbonates mesurée par le calcimètre de Bernard varie entre 5 et 14 %. La teneur en matière organique varie entre 5 et 7,5 %. L’indice de plasticité oscille entre 16 et 17,5. Pour des teneurs en eau proches de la limite de plasticité le degré de retrait au séchage des gasriyas est de l’ordre de 5 %, il est plus élevé pour les briques (8%) ce qui nécessite une plus grande maitrise du processus de séchage pour éviter que les pièces ne se tordent pas. La granulométrie des pâtes utilisées pour les gasriyas a montré une teneur moyenne de 50 % pour les argiles, 32 % pour les limons et 18 % pour les sables. Les briques comportent une proportion égale des trois classes granulométriques. La minéralogie de l’ensemble des pâtes est formée de quartz (< 27%), plagioclase (13%), calcite (7 à 9%), dolomite (5%) et argile (50%, 34% et 34% pour Ag1, Ag5 et Ag7, respectivement). Le feldspath potassique est présent uniquement dans l’échantillon Ag7. Concernant la fraction argileuse, elle est surtout constituée d’illite pour l’ensemble des pâtes, associée à des interstratifiés irréguliers 14c-14s (13 %) pour la pâte des briques, et une teneur de 11 % de smectite pour la pâte des gasriyas (Ag5). La mesure de la vitesse sonique a montré que les pièces formées par pression aboutissent à une porosité moindre que celle des pièces produites par boudinage. La densité des pièces produites reste semblable pour les cuissons à 950°C et 1050°C. Le plus bas degré de porosité ainsi que les plus grandes valeurs de résistance mécanique à la compression ont été enregistrés sur les pièces cuites à 1050 °C. Les contraintes maximales atteintes se situent entre 51 et 59 MPa pour les gasriyas et 24,5 MPa pour les briques. Quant à la résistance mécanique à la flexion, elle varie entre 17,4 et 20,3 N/mm² pour les gasriyas et 9,4 N/mm² pour les briques. L’analyse DRX des pièces cuites à 1050 °C a montré la disparition totale des carbonates et des argiles à cette température, accompagnée de l’apparition de la géhelénite, cristobalite, anorthoclase, diopside, spinelle et hématite. A l’issue de cette étude, nous recommandons un tamisage humide à 1 mm pour réduire l’effet des gros grains de la chaux, une cuisson par palier jusqu’à 1050°C est également nécessaire pour comprendre les transformations des phases minéralogiques et vitreuses. Finalement, l’utilisation des fours équipés d’une sonde pour garantir une meilleure distribution de la chaleur. [less ▲]

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See detailNo simian Plasmodium detected in populations living in the equatorial rainy forest of the Democratic Republic of Congo
Mvumbi makaba, Dieudonné; Bobanga Lengu, Thierry; Kayembe Ntumba, Jean-Marie et al

Poster (2014, April 03)

Background Malaria remains the most deadly parasitic disease to date, especially in sub-Saharan Africa, which comprises the majority of cases collected per year. It has long been accepted that four ... [more ▼]

Background Malaria remains the most deadly parasitic disease to date, especially in sub-Saharan Africa, which comprises the majority of cases collected per year. It has long been accepted that four species of Plasmodium (P. falciparum, P. vivax, P. malariae and P. ovale) were responsible for the disease in humans. But quite recently, a fifth species, Plasmodium Knowlesi, has been identified as naturally infecting humans. Indeed, known for decades as naturally parasitizing the monkey Macaca fascicularis, P. knowlesi has long been confused, in terms of its evolutionary stage, with P. malariae or P. falciparum, which it resembles morphologically and it was not possible to properly differentiate them until the advent of molecular biology. To date, P. Knowlesi has only been identified in Southeast Asia and a similar phenomenon of natural transmission of simian plasmodium to humans has not been reported elsewhere. We therefore conducted this study to investigate the possible transmission of simian plasmodium to humans in populations living near the rainforest of the Democratic Republic of Congo (DRC) where several species of primates lives. Methods & Materials Three villages (Wenji-Secli, Bongonde, and Bolenge) in the Province of Ecuador (North-eastern DRC) were selected because of their geographical location. Blood samples spotted on filter paper were collected from 100 people randomly taken in each village. Two successive RT- PCR were performed. A first one using a single probe able to diagnose all plasmodium spp. and a second using four species-specific probes for the diagnosis of the four conventional human plasmodium species. Positivity in the first RT- PCR with negativity in the second RT- PCR would suggest the presence of plasmodium species other than the four conventional. Results P. falciparum was correctly identified in 44.6 % of samples. No other species of human plasmodium or not has been identified. Conclusion This preliminary study did not detect the presence of simian plasmodium in human populations living in the rainforest of the DRC. Studies with larger samples and with more advanced techniques should still be conducted. Keywords: Malaria, simian plasmodium, DR Congo [less ▲]

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See detailBayesian inference of a dynamic vegetation model for grassland
Minet, Julien ULg; Laloy, Eric; Tychon, Bernard ULg et al

Conference (2014, April 02)

As a part of the MACSUR task L2.4, we probabilistically calibrated the CARAIB dynamic vegetation model by Markov chain Monte Carlo (MCMC) simulation with the DREAMZS sampler.. CARAIB is a mechanistic ... [more ▼]

As a part of the MACSUR task L2.4, we probabilistically calibrated the CARAIB dynamic vegetation model by Markov chain Monte Carlo (MCMC) simulation with the DREAMZS sampler.. CARAIB is a mechanistic model that calculates the carbon assimilation of the vegetation as a function of the soil and climatic conditions, and can thus be used for simulating grassland production under cutting or grazing management. Bayesian model inversion was performed at 4 grassland sites across Europe: Oensingen, CH; Grillenburg, DE; Laqueuille, FR and Monte-Bodone, IT. Four daily measured variables from these sites: the Gross Primary Productivity (GPP), Net Ecosystem Exchange (NEE), Evapotranspiration (ET) and Soil Water Content (SWC) were used to sample 10 parameters related to rooting depth, stomatal conductance, specific leaf area, carbon-nitrogen ratio and water stresses. The maximized likelihood function therefore involved four objectives, whereas the applied Bayesian framework allowed for assessing the so called parameter posterior probability density function (pdf), which quantifies model parameter uncertainty caused by measurement and model errors. Sampling trials were performed using merged data from all sites (all-sites-sampling) and for each site (site-specific sampling) separately. The derived posterior parameter pdfs from the all-sites sampling and site-specific sampling runs showed differences in relation with the specificities of each site. Analysis of these distributions also revealed model sensitivity to parameters conditioned on the measured data, as well as parameter correlations. [less ▲]

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See detailFirst evidence of a volatile sex pheromone in the invasive Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)
Fassotte, Bérénice ULg; Fischer, Christophe ULg; Durieux, Delphine ULg et al

Conference (2014, April 02)

Data about sex pheromones, or any semiochemicals that play a role in Coccinellid mating, remain limited. Since years, various studies and behavioral observations have hypothesized that such molecules are ... [more ▼]

Data about sex pheromones, or any semiochemicals that play a role in Coccinellid mating, remain limited. Since years, various studies and behavioral observations have hypothesized that such molecules are involved in sexual communication of ladybeetles. In this study, we collected volatile organic compounds released by virgin females of the multicolored Asian ladybeetle, Harmonia axyridis (Pallas), which were either allowed or not allowed to feed on aphids. In the presence of aphids, virgin females exhibited “calling behavior”, which has been associated with the emission of a sex pheromone in several Coleoptera species. Bioassays showed that these females released a blend of volatile compounds that is involved in the attraction of males. Gas Chromatography-Mass Spectrometry analyses highlighted specific volatile cues emanating from females, whereas males did not produce these compounds. Five components were identified: (–)-β-caryophyllene, β elemene, methyl-eugenol, α humulene, and α bulnesene. All compounds were produced after virgin females were fed aphids, and their quantity increased across the experimental period. The results confirm that female H. axyridis produce a volatile sex pheromone. Therefore, this study provides important biological information that could promote the development of efficient pest control management methods to manipulate the movements of this invasive ladybeetle, and to reduce its negative impacts on biodiversity. [less ▲]

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See detailConservatoire entomologique de Gembloux Agro-Bio Tech: les coccinelles de Wallonie et de Bruxelles de 2001 à 2009
Vandereycken, Axel ULg; Fassotte, Bérénice ULg; Durieux, Delphine ULg et al

Poster (2014, April 02)

Un inventaire des Coccinellidae présents au sein de la collection de l’unité d’Entomologie fonctionnelle et évolutive (ULg - Gembloux Agro-Bio Tech) a été réalisé sur la période s’étendant de 2001 à 2009 ... [more ▼]

Un inventaire des Coccinellidae présents au sein de la collection de l’unité d’Entomologie fonctionnelle et évolutive (ULg - Gembloux Agro-Bio Tech) a été réalisé sur la période s’étendant de 2001 à 2009. Cette collection est essentiellement constituée par les récoltes des étudiants de première Bachelier de Gembloux Agro-Bio Tech. A travers ce recensement, nous avons étudié l’évolution des espèces récoltées au sein de cette famille en termes d’effectif relatif et de richesse spécifique. Notre étude s’est focalisée sur les données issues de Wallonie et de la Région de Bruxelles-Capitale, trop peu de collectes ayant été réalisées en Flandre. Parmi les individus identifiés, 27 espèces ont été observées, dont 21 appartiennent à la sous-famille des Coccinellinae, 2 à celle des Epilachninae et 4 à celle des Chilocorinae. La plupart des espèces sont communes à la Belgique. Cependant, Harmonia axyridis (Pallas 1773), espèce originaire du sud-est de l’Asie, a été introduite sur le territoire belge en 1997. Cette coccinelle exotique fait son apparition dans les récoltes de 2002 et son effectif ne cesse d’augmenter au fil des années prospectées. En parallèle à cette augmentation, une diminution de la richesse spécifique, ainsi que de l’effectif relatif d’Adalia bipunctata (L. 1758), de Propylea quatuordecimpunctata (L. 1758) et de Psyllobora vigintiduopunctata (L. 1758), est observée. [less ▲]

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See detailA pheromone-based formulation against phytophagous pests
Fassotte, Bérénice ULg; Vandereycken, Axel ULg; Heuskin, Stéphanie ULg et al

Poster (2014, April 02)

Innovative integrated pest management methods are needed to overcome market withdrawal of synthetic pesticides. Therefore, the identification of environment-friendly bio-products carrying direct or ... [more ▼]

Innovative integrated pest management methods are needed to overcome market withdrawal of synthetic pesticides. Therefore, the identification of environment-friendly bio-products carrying direct or indirect biocide activity is one promising alternative option. Our researches focus on the identification of appropriate formulations releasing volatile organic compounds that are attractive for natural enemies of insect pests. However, the elaboration of slow-release devices that ensure stable and controlled release of active volatile compounds is quite challenging. Here, we developed a formulation based on E-β-farnesene and (–)-β-caryophyllene, these two semiochemicals having strong attractive potential on aphid natural enemies including ladybeetles and hoverflies. Both compounds were encapsulated together in alginate gel beads. The blend efficiency is currently being evaluated through laboratory and field assays. [less ▲]

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See detailImages fixes, cadre mobile. Fantômes de cinéma dans la bande dessinée expérimentale contemporaine
Belloi, Livio ULg

Conference (2014, April 02)

La présente communication porte sur la bande dessinée expérimentale contemporaine et se focalise plus particulièrement sur "Travelling Square District" (2010) du jeune dessinateur belge Greg Shaw. Objet ... [more ▼]

La présente communication porte sur la bande dessinée expérimentale contemporaine et se focalise plus particulièrement sur "Travelling Square District" (2010) du jeune dessinateur belge Greg Shaw. Objet très singulier, cet album se présente comme une expérimentation systématique autour du cadre mobile, dans un art fondé sur des successions d'images fixes. En cela, cette œuvre peut être considérée comme relevant d'une para-histoire du cinéma. [less ▲]

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See detailDiversité et abondance entomologique en cultures maraîchères à Libreville et à Owendo (Gabon)
Bayendi-Loudit, Sandrine ULg; Poligui, René Noël ULg; Ndoutoume Ndong, Auguste et al

Conference (2014, April 02)

In order to improve knowledge of the diversity and abundances of the entomofauna occurring within market gardenings in Gabon, this study was conducted in three localities in Libreville and Owendo, from ... [more ▼]

In order to improve knowledge of the diversity and abundances of the entomofauna occurring within market gardenings in Gabon, this study was conducted in three localities in Libreville and Owendo, from July1st to August 31st, 2012. Insect collections from yellow traps and visual observations were performed weekly within plots in which grow Amaranth (Amaranthus sp., Amaranthaceae), red sorrel (Hibiscus sabdariffa L, Malavaceae), Tomato (Lycopersicon esculentum Mill, Solanaceae) and Cabbage (Brassica oleracea L, Brassicaceae). A total of 7119 insects were assessed and taxonomically classified in 8 distinct orders comprising 81 families. The study highlighted some entomologic families with agronomic interest. The main pests were represented by Aphididae (31,0%), Cecidomyiidae (5,1%), Chrysomelidae (4,0%) and Thripidae (2,0%), the useful insects (pollinators and predators) by Dolichopodidae (5,4%), Andrenidae (2,6%) Coccinellidae (1,7%), Syrphidae (0,6%), Braconidae (0,5%) and Hemerobiidae (0,1%) and the associated insects were Psychodidae (7,4%), Muscidae (5,9%), Formicidae (4,4%) and Anthomyiidae (4,2%). Entomological diversity is discussed according to the local conditions and potential for sustainable pest control encountered. [less ▲]

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See detailStudy of sex ratio and morphotypes of the Multicoloured Asian Ladybird, Harmonia axyridis Pallas in Belgian corn
Vandereycken, Axel ULg; Fassotte, Bérénice ULg; Barsics, Fanny ULg et al

Poster (2014, April 02)

Several insect species are known to have different morphotypes, an adaptation to heterogeneities in changing environments. This phenotypic plasticity could be a factor used by the Multicoloured Asian ... [more ▼]

Several insect species are known to have different morphotypes, an adaptation to heterogeneities in changing environments. This phenotypic plasticity could be a factor used by the Multicoloured Asian Ladybird, which is considered as an invasive species in Europe since its introduction in the 80’s. Harmonia axyridis has four major morphotypes: 2 melanic forms, conspicua and spectabilis; and 2 non-melanic, succinea and axyridis. In Belgium, only the three first are observed. Literature reports variations in morphotype frequencies, across native and introduced strains. These variations seem to be linked to climate (geographical and seasonal variation), with non-melanic forms being the most abundant in hot and arid climate. This study focused on the variation of morphotype abundance in H. axyridis according to season, field and gender. Adult ladybirds were caught from mid-July to mid-October 2012 into 5 corn fields. The proportions of observed morphotypes were compared according to the sampling season. The abundance of morphotypes was not significantly different through the fields; the observed ratios were 81.6%, 15% and 3.4% for succinea, spectabilis and conspicua respectively. Succinea was the most observed morphotype (χ2=755.8; P<0.001). The total number of collected males and females was the same with ratios of 48.2% and 51.8%: (χ2=0.93; P=0.33). The sex ratio was also not significantly different for each morphotype. There was no evolution of melanic and non-melanic form ratio according to the season, with 25.6% of melanic form in summer and 20.6% in autumn (χ2=1.22; P=0.27). Our results seem to show that morphotype adaptation according to the climate is not observed for Belgian ladybirds. We discuss these results according to all environmental data available. [less ▲]

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See detailApport des examens biologiques en pratique allergologique
GADISSEUR, Romy ULg

Conference (2014, April 02)

Apport des examens biologiques en pratique allergologique

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See detailBiological control of aphids in wheat and vegetable crops : a multi-approach case study in Shandong province (China)
Chevalier Mendes Lopes, Thomas ULg; Bosquée, Emilie ULg; Chen, Julian et al

Poster (2014, April 02)

This multi-approach study was conducted in the Shandong province (China) to assess the effectiveness of different biological control methods against aphids in wheat and vegetable crops. Three approaches ... [more ▼]

This multi-approach study was conducted in the Shandong province (China) to assess the effectiveness of different biological control methods against aphids in wheat and vegetable crops. Three approaches were tested: (1) wheat/oilseed rape and wheat/pea associations, (2) potatoes/peas association, and (3) E-β-farnesene (aphid alarm pheromone) releasers in squashes under plastic tunnels. Aphids and aphidophagous beneficials were monitored by observations on plants. Wheat associations and E-β-farnesene reduced aphid infestations compared with control treatments, while no effect was observed in the potatoes/peas association. Moreover, aphidophagous beneficials were significantly more abundant in the three kinds of associations compared with control treatments. Few individuals were observed on squashes. Additionally, adult aphidophagous beneficials were monitored using yellow pan traps. The parasitoid species Aphidius gifuensis (Ashmead) was prevalent, while Propylea japonica (Thunberg) and Harmonia axyridis (Pallas) were the most abundant species among predators. Globally, wheat associations were more efficient to reduce aphid infestations and attract aphidophagous beneficials to promote biological control. The trapping of natural enemies allowed to assess the diversity and abundance of aphidophagous species in this region. This study shows a beneficial effect of crop associations and E-β-farnesene on the control of aphid populations and contributes to assess the potentialities of these alternative methods to the use of insecticides. [less ▲]

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See detailInvolved PhD research – a case study between agronomy and social sciences
Klaedtke, Stephanie ULg; Chable, Véronique; Stassart, Pierre M ULg

Conference (2014, April 02)

In research projects based on questions which emerge from practice and from interactions with different stakeholders, researchers engage with research partners in a cooperative and interdisciplinary ... [more ▼]

In research projects based on questions which emerge from practice and from interactions with different stakeholders, researchers engage with research partners in a cooperative and interdisciplinary approach. In PhD projects, including a diverse network of partners and interdisciplinarity may be challenged by the short duration of the projects and by the positivist and reductionist approaches in which students are initially trained. Based on a concrete PhD research project on small-scale organic seed production, the objective of this work is to elucidate how interdisciplinarity and an action-base can nevertheless gradually be integrated by PhD students into an approach best termed as involved research. Reflection on the roles of partners, their involvement, motivation and points of view and on the evolution of questions posed during interactions between students and stakeholders contributes to recognizing the role of each partner, situating research postures, and identifying the types of knowledge and transformations produced. While PhD students and their research projects can evolve towards more holistic and constructivist approaches, it is crucial to maintain opportunities for reflection during their research in order to realize the potentials of involving all those involved in the projects and produce effective social learning processes. [less ▲]

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See detailWill top-down interactions be affacted by climate change?
Boullis, Antoine ULg; Verheggen, François ULg; Francis, Frédéric ULg

Poster (2014, April 02)

Greenhouse gas emissions are rising since the beginning of the industrial era: atmospheric carbon dioxide now exceeds 400 ppm (30% increase since the mid-1800s) and tropospheric ozone has reached 40 ppb ... [more ▼]

Greenhouse gas emissions are rising since the beginning of the industrial era: atmospheric carbon dioxide now exceeds 400 ppm (30% increase since the mid-1800s) and tropospheric ozone has reached 40 ppb in industrialized areas. According to forecasting models, these concentrations are expected to double by the end of the 21st century. To date, impacts of elevated greenhouse gases have been extensively studied in plant-insect interactions, whereas interactions between herbivores and their natural enemies have been neglected. Because most interactions between herbivorous insects and their natural enemies are orchestrated by natural molecules produced as semiochemicals, we hypothesize that modification in atmospheric gas composition will alter chemical communication in insects, and affect the performance of natural enemies to locate their prey. In this project, we shall attempt to analyze the effect of increase in greenhouse gas concentrations on insect communication, particularly in top-down interactions. The study model will consist in the interactions between the pea aphids (Acyrthosiphon pisum (Harris)) and their natural enemies Harmonia axyridis (Pallas) and Episyrphus balteatus (DeGeer). Under elevated CO2 and/or O3 concentrations, we will quantify the production of several aphid semiochemicals that are currently used as kairomones by natural enemies, including the aphid alarm pheromone E-β-farnesene and honeydew volatile compounds. Olfactometry assays will then be set up to examine the ability of natural enemies to locate their prey in the predicted atmospheric conditions of the end of the 21st century. Finally, using an Ecotron structure to be built in Gembloux Agro-Bio Tech, we will simulate a future ecosystem with the possibility to control additional biotic and abiotic parameters. [less ▲]

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See detailStudy of the Bacillus subtilis PBP4* and RacX, YlmE racemases in relation with disassembly of biofilms
Vanden Broeck, Arnaud ULg

Conference (2014, April 01)

Bacillus subtilis is a PGPR (Plant Growth Promoting Rhizobacterium) Gram positive bacterium and a model for studying the in vitro formation or disruption of biofilms. At the liquid/air interface of ... [more ▼]

Bacillus subtilis is a PGPR (Plant Growth Promoting Rhizobacterium) Gram positive bacterium and a model for studying the in vitro formation or disruption of biofilms. At the liquid/air interface of standing cultures, B. subtilis forms thick pellicles of limited lifetimes. Some D-amino acids have been reported among the factors playing a role in the disassembly of B. subtilis biofilms and ylmE or racX mutants (in which the racemases YlmE or RacX are absent) show a delay in pellicle disruption. The racX encoding gene is part of a bicistronic operon in which the second gene (pbpE) codes for a Penicillin-Binding Protein, the PBP4* whose function is not characterized in Bacillus. Our studies aim to produce, purify and characterize the role of the PBP4* and RacX, YlmE racemases in relation with the disassembly of biofilms. Biochemical and structural data have been obtained and the role of the three proteins has been partly solved. X-ray structures will permit us to create inhibitor molecules against Bacillus subtilis biofilm formation or disassembly. [less ▲]

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See detailComportements à risques et maladies cardio-vasculaires, comment infléchir le cours des choses?
Krzesinski, Jean-Marie ULg; andre, Jean-François

Conference (2014, April 01)

Entre recommandations, croyances et attitudes des médecins, croyances, attitudes et vécu des patients, comment améliorer la prévention dans le domaine cardio-vasculaire?

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See detailNeuropathies proximales du membre supérieur
WANG, François-Charles ULg

Conference (2014, April 01)

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See detail« Penser avec et contre Fanon : sur Achille Mbembe, ‘’Le fouet de Dieu’’ (in De la postcolonie) »
Melice, Anne ULg

Conference (2014, April 01)

Achille Mbembe remarque, pour le regretter, que la réflexion qu’il a intitulée « Le fouet de Dieu » n’a guère fait l’objet de lectures critiques. C’est précisément à dégager les enjeux de ce chapitre de ... [more ▼]

Achille Mbembe remarque, pour le regretter, que la réflexion qu’il a intitulée « Le fouet de Dieu » n’a guère fait l’objet de lectures critiques. C’est précisément à dégager les enjeux de ce chapitre de son livre De la postcolonie que vise mon intervention. J’avais été très impressionnée, lors de mes recherches doctorales sur le kimbanguisme, par les analyses relatives au christianisme figurant dans Afriques indociles. Ces thèses sont tout à la fois creusées et déplacées dans « Le fouet de Dieu ». L’avant-propos de la deuxième édition du livre suggère brièvement une mise en perspective stimulante de ces pages. Prenant acte de la nécessité de désormais « penser avec et contre Fanon », Mbembe y souligne qu’elles ouvrent sur une conception du rapport éthique à autrui, qui prend chez lui la forme d’une prescription inconditionnelle : « donner la mort à la mort ». Mon interrogation se resserre autour de la thématique de l’altérité. En rassemblant en gerbe les problématiques du désir, de la domination et de la liberté, elle met au jour l’articulation profonde du religieux et du politique. [less ▲]

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See detailPolyplexes Targeting Angiogenesis in Cancer
Frère, Antoine ULg; Peixoto, Paul ULg; Kawalec, Michal et al

Poster (2014, April)

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See detailINFLUENCE OF WHEY PROTEIN DENATURATION ON ADHERENCE
Toure, Yetioman ULg; Rouxhet, G. Paul; Dupont-Gillain, C. Christine et al

in Dr Wilson, I.; Chew, Y.M.J. (Eds.) Fouling and Cleaning in Food Processing (2014, April)

This work reports on the influence of -lactoglobulin (β-LGB) and of its denaturation on the adherence of quartz particles, taken as a model of particulate soil, on stainless steel AISI 304 with mirror ... [more ▼]

This work reports on the influence of -lactoglobulin (β-LGB) and of its denaturation on the adherence of quartz particles, taken as a model of particulate soil, on stainless steel AISI 304 with mirror finish. The substrate was soiled with quartz suspensions in water or in β-LGB solutions as such or previously heated at 75°C, and dried at room temperature or in an oven at 75°C. Cleanability was evaluated after exposure to water in a radial flow chamber. Auxiliary characterizations were the surface tension and protein concentration of the solution, surface analysis of the substrate by X-ray photoelectron spectroscopy (XPS) and contact angle measurements. The contact of stainless steel with -LGB led to adsorption of the protein, which dominated the composition of the organic layer with respect to contaminants initially present, and was not markedly desorbed upon rinsing. The presence of β-LGB at the quartz particle/substrate interface slightly increased the adherence, which was further increased when the protein was denatured. On the other hand, denaturation of -LGB enhanced its surfactant effect at the water/air interface. Comparison with systems investigated before suggests that the influence of protein via droplet spreading and soiling particles aggregation may be of minor importance compared to direct effects on the substrate/quartz interface. Stainless steel does not behave as a hydrophilic substrate owing to its surface contamination with organic compounds. It appears suitable to examine the influence of the initial surface state of stainless steel on its behavior regarding soiling and cleaning. [less ▲]

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See detailDynamics of a Strongly Nonlinear Spacecraft Structure Part I: Experimental Identification
Noël, Jean-Philippe ULg; Renson, Ludovic ULg; Kerschen, Gaëtan ULg

in Proceedings of the 13th European Conference on Spacecraft Structures, Materials and Environmental Testing (2014, April)

The present paper addresses the identification of a real-life spacecraft structure possessing a strongly nonlinear component with multiple mechanical stops. The complete identification procedure, from ... [more ▼]

The present paper addresses the identification of a real-life spacecraft structure possessing a strongly nonlinear component with multiple mechanical stops. The complete identification procedure, from nonlinearity detection and characterization to parameter estimation, is carried out based upon experimental sine-sweep data collected during a classical spacecraft qualification campaign. [less ▲]

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See detailQuasi-loss of nationality - a new concept or a non-issue?
Wautelet, Patrick ULg; de Groot, Gerard-René

Conference (2014, April)

Quasi-loss of nationality : “is this a loss I see before me?” Prof. Gerard-René de Groot (University Maastricht, Aruba and Hasselt) Prof. Patrick Wautelet (University Liège) This paper focuses on ... [more ▼]

Quasi-loss of nationality : “is this a loss I see before me?” Prof. Gerard-René de Groot (University Maastricht, Aruba and Hasselt) Prof. Patrick Wautelet (University Liège) This paper focuses on situations in which a person is said never to have had the nationality of a country, even though (s)he assumed (and in many cases the authorities of the country concerned shared that assumption) that (s)he possessed that nationality. Contrary to situations of loss of nationality, where something is taken away which existed, those situations involve a decision that a nationality was never acquired. This subtle distinction between loss and non-acquisition will in most cases be lost on the persons concerned who will experience the decision as a loss of nationality. The central question of this paper is, whether these situations of quasi-loss differ so much from loss cases, that they have to be treated differently. If and insofar as this would be the case, a next question is, whether a person should under certain circumstances be protected against quasi-loss of her or his nationality. In order to answer these questions, the paper will first attempt to map out situations of quasi-loss in EU member states. Typical cases will be described in which a person did never acquire the nationality of the country, although (s)he was considered as a national before certain facts happened. Drawing on this taxonomy, the paper will offer a first attempt at uncovering whether national, European and international law offer some protection, and if yes, to which extent, for situations of quasi-loss. This paper will conclude with outlining best practices which Member States should comply with in handling quasi-loss situations. [less ▲]

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See detailSTI narratives in Wallonia: A complex interplay
Charlier, Nathan ULg

Conference (2014, April)

It is widely acknowledged that scientific research and science, technology and innovation (STI) policies within the US and the EU have gone through deep changes for about 30 years. Many scholars from ... [more ▼]

It is widely acknowledged that scientific research and science, technology and innovation (STI) policies within the US and the EU have gone through deep changes for about 30 years. Many scholars from science and technology studies and innovation studies have investigated these policy changes, and the publication of “The New Production of Knowledge” (Gibbons et al., 1994) paved the way for vigorous debates on regimes of knowledge production (Hessels & Van Lente, 2008). While different general models were proposed to describe a transition (see, e.g. “mode 2 production of knowledge”, “post normal science”, “strategic science”, “academic capitalism”), these models often posit a dichotomous history, stating that a new regime simply succeeded the previous one (Rip, 2000). In a nutshell, the old regime characterized by strong public intervention and a linear conception of innovation is replaced by a new regime where research and innovation are conceived in systemic terms, regarding their strategic interest for the economy and their societal relevance. This dichotomous conception of STI policy change has been criticized regarding its historical accuracy, e.g. with Pestre (2003), showing that the autonomy of research that characterizes the old regime, or “mode 1” is While the diagnosis of these various science and technology policy studies is not to be dispraised concerning the different effects they emphasize, These macro-perspectives are of little use when it comes to study a local situation they lack acuteness to properly describe and compare empirical observation of such policy changes. This issue is even more salient for empirical work to be conducted in states where multi-level policies are crafted on different, sometimes overlapping national and regional polities. In Belgium, the case in point in my PhD researches, the above-mentioned studies are of little use to characterize the actual state and interplay of Walloon and Flemish STI systems. Hence, there is a need to develop theoretical approaches paying greater attention to local specificities and nuances. My proposal builds on an analysis of STI policies based on coexisting, and sometimes competing “narratives”. In the vein of Stone (1989) and Radaelli (2000), this paper aims at comparing the different policy narratives that circulates as rationale for STI policies in Wallonia, to identify their variants and to study their interplay. Policy narratives give meaning to complex realities, they help making sense of things, but they also contain a plot; they are articulating elements in a logical sequence (with, e.g., causalities, cf. Stone, 1989). As such, they are resources for action: they are descriptive and prescriptive. The broad literature of innovation studies, and its diffusion through the EU or the OECD already provides the Walloon STI stakeholders with different master-narratives (Sum & Jessop, 2013). So far, I could distinguish four different master-narratives in the literature as well as in Walloon stakeholders ‘discourses: • “The Knowledge-based economy” (KBE). KBE seems to be the “dominant” master-narrative today. In a nutshell, this narrative runs as follow (see OECD, 1996): knowledge is the source of economic growth. Since innovation and market success are better encountered through network management and the intertwinement of industry and university, STI institutions must be organized accordingly, in order to achieve a sustained growth and a “better competitiveness” o Variants of this narrative are, e.g. the triple-helix model (Etzkowitz & Leydesdorff, 2000), or National innovation system (Freeman, 1987, Lundvall, 1988). • Grand societal challenges: This recent master-narrative is being promoted by the OECD and the EU (see, e.g., Lund Declaration, 2009). It states that scientific research should benefit of high (public) funding in certain areas, or regarding certain issues. High means for strategic research should help to solve major problems such as climate change, ageing population, energy supply and consumption, cancer, etc. This narrative calls for mission oriented STI policy, so the concern here is not (solely/primarily) economic (Kallerud et al 2013). • “Science, the endless frontier” - continued: famously reported by V. Bush (1945), this master-narrative is still of common use among STI stakeholders. With this narrative, science is considered a public good, the state has to fund it because the linear conception of innovation and serendipity assure technological and economic progress in the end – the rationale is based on economic aspects (the state must fund research because it is a special kind of good and the market efficiency will not work, and basic research is the source of marketable innovation). • “Science for the sake of science”: in this narrative, science is considered as common good regardless of the potential economic impacts (and usefulness to address other societal issues) – we can make a parallel with the idea that artistic creation is worth it: for the beauty, for the critique, science here is considered as a superior activity that brings rationality and knowledge to the society as long as it is independent from “external influences” (Bonneuil & Joly, 2013) – cf. “mertonian Ethos” of Communalism, Universalism, Disinterestedness, Originality and Skepticism. Other examples / variants of this narrative include the idea that science contributes to the greatness of Nation, that science fights obscurantism, and so on and so forth. (examples : peer review, excellence, Copernican revolution are compatible storylines with science for the sake of science : a self-supporting system) While these master-narratives are present in international, academic literature, this paper focuses on their local manifestations. This study compares three critical moments: in different situations, various STI stakeholders (government, researchers, administrative staff, journalists, academic authorities, etc.) publicly expressed their views on the organization and funding of scientific research and innovation activities, and the role of STI within the region. I analyzed the discourses in press articles, policy documents, public statements, allocutions and opinion paper, blogs, etc. I intentionally sampled for heterogeneity since I’m looking for variations and multiple use of narratives. The analysis of the Walloon case permits to overcome the double dichotomy of dominant vs. counter narrative and old vs. new regime. The different narratives, in context, are concurrent but they are not mutually exclusive: while the narratives purport different ideologies, different visions of the role of science and of the state intervention, one is not being erased by the advent of another. Rather, I could find out that narratives “overlap”, and one narrative does not constitute the only resource of a (group of) actors. In situation, the actors use one or multiple narratives, regarding the context, the public, the goal of a policy, etc., in a dynamic of conflict or compromise. This description of the transition is more accurate than the one provided with a sequence of two regimes, since the flexible use of multiple narratives accounts for the continuity of certain institutions (justified by, e.g., a version of “science for the sake of science”) as well as for certain reforms in STI policy (that are inspired by the KBE narrative, for example). [less ▲]

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See detailA new methodological approach for error distributions selection in Finance
Hambuckers, julien ULg; Heuchenne, Cédric ULg

Conference (2014, April)

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the ... [more ▼]

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the traditional approach, we don't use any GARCH-type estimation of the conditional variance. Instead, we propose to use a recently developed nonparametric procedure (Mercurio and Spokoiny, 2004): the Local Adaptive Volatility Estimation (LAVE). The motivation for using this method is to avoid a possible model misspecification for the conditional variance. In a second step, we suggest a set of estimation and model selection procedures (Berk-Jones tests, kernel density-based selection, censored likelihood score, coverage probability) based on the so-obtained residuals. These methods enable to assess the global fit of a given distribution as well as to focus on its behavior in the tails. Finally, we illustrate our methodology on three time series (UBS stock returns, BOVESPA returns and EUR/USD exchange rates). [less ▲]

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See detailA geochemical and petrological study of the Late Cretaceous banatites from the Apuseni Mountains, Romania
Vander Auwera, Jacqueline ULg; Berza, Tudor; Dupont, Alain et al

Poster (2014, April)

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