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See detailUn outil d’aide à la décision pour la gestion des chablis en Région wallonne (Belgique)
Riguelle, Simon ULg; Hebert, Jacques ULg; Jourez, Benoît ULg

Poster (2009, June 30)

The poster highlights the main steps leading to the development of a decision-support tool for storm damage management by the forest sector at a regional scale.

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See detailEvaluation de la fonction récréative des massifs forestiers wallons
Colson, Vincent ULg; Lejeune, Philippe ULg; Rondeux, Jacques ULg

Poster (2009, June 29)

Estimer la valeur économique des visites effectuées à des fins récréatives en forêt wallonne.

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See detailQuelles sont les espèces d’oiseaux indicatrices de la qualité des forêts feuillues ardennaises ?
Delahaye, Laurence; Rondeux, Jacques ULg

Poster (2009, June 29)

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See detailDividends and Foreign Performance Signaling
Muller, Aline ULg; Joliet, Robert

Conference (2009, June 29)

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See detailScabies in a llama (Lama glama): control with moxidectin long acting (Cydectin®LA)
Caron, Yannick ULg; Cavadino, Céline; Losson, Bertrand ULg

Poster (2009, June 29)

An adult neutered male llama (Lama glama) was presented for examination with a history of a severe long lasting (3 years) and recurrent itch and crust formation. Three years ago, scabies had been ... [more ▼]

An adult neutered male llama (Lama glama) was presented for examination with a history of a severe long lasting (3 years) and recurrent itch and crust formation. Three years ago, scabies had been diagnosed by a local vet on the basis of clinical signs; the animal was treated several times with ivermectin (Ivomec®) injectable and phoxim (Sarnacuran®). After each treatment there was a marked clinical improvement but relapse was the rule within 1 to 2 months. During the two years preceeding our first visit the animal had received local applications of Sarnacuran every two to three weeks wich resulted in incomplete control. None of the owners had reported skin lesions compatible with scabies. On February 27th 2009 the animal showed a marked pruritus accompanied by very thick scabs and alopecia on the face (around the mouth and ears), shoulders, forelegs, hindlegs, abdomen, flanks and the tail. Clinical examination revealed a fairly good general condition. Abnormalities were limited to the skin. Skin scrapings were taken and numerous Sarcoptes scabiei mites were subsequently detected microscopically. Sedation and analgesia were performed via the intramuscular administration of xylazine (Vexylan®) at 0.5 mg/kg. The scabs were humidified with a camomile infusion and a maximum of material was removed and destroyed. Then the llama was treated with 10% moxidectin (Cydectin LA®) at 1 mg/kg by subcutaneous injection at the basis of the ear. On April 6th 2009, a very marked clinical improvement was observed: most of the scabs had dissapeared and hair regrowth in previously alopecic area was observed. Skin scrapings were negative. However, some pruritus was still observed and a second treatment with Cydectin LA was given. According to the owner who was contacted by phone in early May the clinical condition of the animal has further improved. A final visit is planned to assess the clinical and parasitological cure in this S. scabiei infected llama. At our knowledge, this is the first time Cydecin LA is used in llama for the treatment of scabies. [less ▲]

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See detailActualité des droits communautaire et belge de la concurrence
Petit, Nicolas ULg

Conference (2009, June 29)

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See detailCapital structure effects of international expansion
Muller, Aline ULg; Joliet, Robert

Conference (2009, June 28)

Detailed reference viewed: 23 (0 ULg)
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See detailL’apport des focus groups dans la compréhension des structures de raisonnement quant à la conscientisation accompagnant la transmission des faits génocidaires
Grandjean, Geoffrey ULg

Conference (2009, June 26)

La transmission des faits génocidaires auprès des jeunes générations semble être accompagnée d’une conscientisation favorisant l’adoption par les adolescents de certains comportements ou attitudes. Pour ... [more ▼]

La transmission des faits génocidaires auprès des jeunes générations semble être accompagnée d’une conscientisation favorisant l’adoption par les adolescents de certains comportements ou attitudes. Pour appréhender cette conscientisation, des focus groups ont été réalisés auprès d’adolescents belges francophones (âgés de 16 à 18 ans). Le but était de voir, à travers les discussions, comment ces jeunes ont internalisé la conscientisation accompagnant la transmission des faits génocidaires. Cette communication contribue ainsi au débat méthodologique qui entoure l’utilisation des focus groups dans la recherche en science politique et sociale et plus particulièrement pour saisir les structures de raisonnement de ces jeunes, considérées dans une dynamique sociale. Afin d’illustrer ce propos, quelques résultats sont présentés. [less ▲]

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See detailLa prévention médicalisée est-elle néfaste pour nos patients ? Et à quelles conditions leur serait-elle bénéfique ?
Vanmeerbeek, Marc ULg

Conference (2009, June 25)

En examinant nos pratiques en prévention, il semble nécessaire de mieux asseoir la validité scientifique de nos actes, e.a. en prenant de la distance par rapport aux pressions commerciales. Il serait ... [more ▼]

En examinant nos pratiques en prévention, il semble nécessaire de mieux asseoir la validité scientifique de nos actes, e.a. en prenant de la distance par rapport aux pressions commerciales. Il serait utile de rapprocher la médecine générale et la santé publique, en augmentant la place de la promotion de la santé et ne développant la place du patient. De nouvelles tâches sont à imaginer dans un partenariat multidisciplinaire. [less ▲]

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See detail‘Dagongzhe’ Write to the magazines: suffering, borders stretching and longings. Dialectics of identification and legitimation
Florence, Eric ULg

Conference (2009, June 23)

‘Dagongzhe’ Write to the magazines: suffering, borders stretching and longings. Dialectics of identification and legitimation. Eric Florence, PhD in Political and Social Sciences, Researcher at the Centre ... [more ▼]

‘Dagongzhe’ Write to the magazines: suffering, borders stretching and longings. Dialectics of identification and legitimation. Eric Florence, PhD in Political and Social Sciences, Researcher at the Centre for Ethnic and Migration Studies, the University of Liege. In this paper, I will look at the different kinds of values that are fostered within articles (diaries, letters, etc.) published in magazines for rural migrant workers. After having detailed the criterion used by editors of these magazines in the process of selecting or rejecting writings sent to them by migrant authors, I will detail three types of narrative modes found in magazines aimed at migrant workers. The first one signals suffering, disillusionment and sometimes irony. The second narrative mode entails claim making by migrant workers which are often backed by editors. I argue that this belongs to what O’Brien calls “contentious politics”. Eventually, the third mode examined in this paper will be thought of as strategic narrative framing on the part of migrant authors. In such framing the pedagogic role of guidance by editors is central I shall stress. But I shall argue at the same time that despite such framing, much of these writings are permeated by a powerful politics of desire and that such politics is particularly hard to analyse. In addition to a qualitative analysis of both published and unpublished writings by migrant workers and editors, I will also confront such writings and the values they convey to the fruit of my ethnographic fieldwork carried out in the Pearl River Delta between 2001 and 200 [less ▲]

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See detailApplying control volume finite element for modelling direct injection boom spraying flow
El Aissaoui, Abdellah; Lebeau, Frédéric ULg; Destain, Marie-France ULg et al

Conference (2009, June 23)

Assessment of injection lag transport and uniformity of direct injection boom sprayer is an important issue for successful variable rate spraying technology. To estimate the boom lag transport and ... [more ▼]

Assessment of injection lag transport and uniformity of direct injection boom sprayer is an important issue for successful variable rate spraying technology. To estimate the boom lag transport and pressure loss, a numerical model is formulated on the basis of fluid hydrodynamic conservation equations. The software is implemented in visual basic. To solve the pressure – velocities equations, control volume finite element method (CV) is used to delimit elementary volumes of the boom. Linearization of the conservation laws is ensured by considering discrete form of the equations and calculating velocity and pressure step by step throughout the whole boom. The flow behaviour is simulated into a boom section divided into N elementary volumes, each of them including one nozzle. To test the model, three boom diameters (5, 6 and 8 mm) and two chemical viscosities (10-6 and 10-5 m2/s) were used. Experimental trials are carried out on boom having 2.5 m length (5 nozzles) for measuring pressure gradient and lag transport. Results showed that the model can predict the pressure losses and the lag transport accurately (error within 5%) to optimize boom designs. [less ▲]

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See detailOrganoclays prepared in supercritical CO2: implication of onium stability on the properties of PA6 nanocomposites
Naveau, Elodie ULg; Calberg, Cédric ULg; Detrembleur, Christophe ULg et al

Conference (2009, June 23)

The organomodification of layered silicates via our patented supercritical CO2 ion-exchange process, enables the use of a large variety of surfactants, among which phosphonium and ammonium ions of the ... [more ▼]

The organomodification of layered silicates via our patented supercritical CO2 ion-exchange process, enables the use of a large variety of surfactants, among which phosphonium and ammonium ions of the very same structure. The as-obtained organoclays were melt blended with PA6 and the morphology as well as the fire properties of the nanocomposites were studied. With the same degree of nanodispersion, longer ignition times were observed with phosphonium-modified clays compared to ammonium-modified clays. [less ▲]

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See detailSome Remarks on Dominique Pradelle's Lecture: "Does Husserl have a Reducibility Principle?"
Dewalque, Arnaud ULg

Conference (2009, June 23)

Comments on D. Pradelle's lecture (for details, see the attached document).

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See detailProposed design rules for iron columns reinforced by FRP
Ly, Dong Phuong Lam ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg et al

in Mazzolani, F. M. (Ed.) Protection of historical buildings, Prohitech 09 (2009, June 21)

This paper presents design rules for iron columns under axial compression, strengthened with high modulus carbon fibre reinforced polymer (FRP) sheets. According to experimental and numerical results, it ... [more ▼]

This paper presents design rules for iron columns under axial compression, strengthened with high modulus carbon fibre reinforced polymer (FRP) sheets. According to experimental and numerical results, it is shown that the resistance and stiffness of iron columns can be significantly increased with the use of longitudinal FRP sheets because of the reduction of the column slenderness, but also that transverse FRP sheets should be used to prevent any local buckling of the longitudinal FRP sheets [less ▲]

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See detailProduction of polymer/clay nanocomposite foams with improved fire behaviour using supercritical fluid technology
Urbanczyk, Laetitia ULg; Calberg, Cédric ULg; Detrembleur, Christophe ULg et al

Poster (2009, June 19)

In this study, supercritical CO2 is successfully used as foaming agent to prepare poly(styrene-co-acrylonitrile) (SAN) foams containing a low amount of well-dispersed nanoclay (5wt%). This kind of ... [more ▼]

In this study, supercritical CO2 is successfully used as foaming agent to prepare poly(styrene-co-acrylonitrile) (SAN) foams containing a low amount of well-dispersed nanoclay (5wt%). This kind of nanofiller has an influence both on material cellular morphology and fire property. In fact, SAN foam filled with nanoclay has smaller cells and higher density compared to unfilled foam. Moreover, the nanocomposite foam burns more slowly and without producing any burning droplets, which is highly desirable when considering housing applications. [less ▲]

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See detailFrom "Spirou" and "Tintin" to "Pilote". A French break from the Belgian classicism
Dejasse, Erwin ULg

Conference (2009, June 19)

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See detailDetecting Triangle Inequality Violations in Internet Coordinate Systems
Kaafar, Mohamed Ali; Cantin, François ULg; Gueye, Cheikh Ahmadou Bamba ULg et al

in Future Networks 2009 (2009, June 18)

Internet Coordinate Systems (ICS) have been proposed as a method for estimating delays between hosts without direct measurement. However, they can only be accurate when the triangle inequality holds for ... [more ▼]

Internet Coordinate Systems (ICS) have been proposed as a method for estimating delays between hosts without direct measurement. However, they can only be accurate when the triangle inequality holds for Internet delays. Actually Triangle Inequality Violations (TIVs) are frequent and are likely to remain a property of the Internet due to routing policies or path inflation. In this paper we propose methods to detect TIVs with high confidence by observing various metrics such as the relative estimation error on the coordinates. Indeed, the detection of TIVs can be used for mitigating their impact on the ICS itself, by excluding some disturbing nodes from clusters running their own ICS, or more generally by improving their neighbor selection mechanism. [less ▲]

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See detailNew fluorinated surfactants for nanogels preparation
Alaimo, David ULg; Rieger, Jutta; Beigbeder, Alexandre et al

Conference (2009, June 18)

A series of novel fluorinated amphiphilic stabilizers of different architecture (diblock, grafted, or palm tree copolymers) were successfully prepared by reversible addition-fragmentation chain transfer ... [more ▼]

A series of novel fluorinated amphiphilic stabilizers of different architecture (diblock, grafted, or palm tree copolymers) were successfully prepared by reversible addition-fragmentation chain transfer and used as stabilizers for the dispersion polymerization of 2-hydroxyethyl methacrylate (HEMA) in fluorinated solvent, namely alpha,alpha,alpha-trifluorotoluene (TFT). The effect of the amount and the architecture of the copolymer on the size and the stabilization of the particles was studied. Whatever the experimental conditions, scanning electron microscopy showed the formation of submicronic (typically about 300 nm) spherical particles, with a narrow size distribution. The principal difference emerges from the concentration of surfactant. Indeed, at higher copolymer concentration, smaller and less aggregated particles were produced. These results were confirmed by dynamic light scattering but these measurements also revealed the presence of larger aggregates (1,5 micrometer). Furthermore, the surfactant properties of the copolymers were investigated by measuring the interfacial tension at the H2O/TFT interface, and the results were correlated to their stabilizing efficiency in the dispersion polymerization of HEMA. [less ▲]

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See detailSept personnages en quête d'auteur
Scheepers, Caroline ULg

Conference (2009, June 18)

Une première recherche exploratoire portant sur vingt travaux de fin d’études élaborés par de futurs instituteurs du primaire a révélé différents problèmes liés à la question des savoirs : plagiats ... [more ▼]

Une première recherche exploratoire portant sur vingt travaux de fin d’études élaborés par de futurs instituteurs du primaire a révélé différents problèmes liés à la question des savoirs : plagiats, savoirs savants insuffisamment mobilisés, savoirs foisonnants exhibés mais non fonctionnalisés, derrière lesquels se cache le scripteur… Or, le TFE constitue à mon sens un témoin et un auxiliaire déterminants dans le complexe processus d’objectivation – subjectivation – création de savoirs (tant scientifiques qu’expérientiels) que l’enseignant en devenir est appelé à mettre en oeuvre. Une recherche-formation (qualitative, longitudinale, impliquée, interventionniste) a été conduite de 2003 à 2006 auprès d’une petite cohorte de futurs instituteurs du fondamental. La formation s’est organisée autour d’un même principe fédérateur : constituer à la haute école une communauté d’enseignants-chercheurs en devenir, ce qui implique bien entendu de prendre notamment en compte la problématique des savoirs. Dans cette contribution, sera envisagée plus spécifiquement la question des savoirs tels qu’ils se déclinent dans les journaux de formation tenus durant trois ans par sept étudiants et dans leurs TFE (version brouillonnante puis définitive) : nature des savoirs convoqués, rapport noué avec les savoirs, articulation des savoirs savants et expérientiels, gestion de la polyphonie discursive… L’analyse compréhensive qui a été menée révèle des types distincts de réflexivité, des façons différentes de s’inscrire (ou pas) comme auteurs de son texte. [less ▲]

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See detailThe daughters of family business: Developing a global research agenda
Nelson, Teresa; Constantinidis, Christina ULg

Conference (2009, June 18)

Detailed reference viewed: 23 (3 ULg)
See detailThe diversity of Clostridial hydrogenases and biohydrogen production
Calusinska, Magdalena ULg; Savichtcheva, Olga; Masset, Julien ULg et al

Poster (2009, June 18)

Molecular hydrogen is a key intermediate in metabolomic interactions of a wide range of microorganisms. Hydrogen is also regarded as a key component in future energy systems as it is a sustainable, clean ... [more ▼]

Molecular hydrogen is a key intermediate in metabolomic interactions of a wide range of microorganisms. Hydrogen is also regarded as a key component in future energy systems as it is a sustainable, clean, and transportable energy carrier. Some microorganisms can produce hydrogen during a reversible reduction of protons to dihydrogen, a reaction which is catalyzed by hydrogenases [1]. Hydrogenases belong to an iron – sulphur protein family, that contains active sites consisting of inorganic sulfide and iron atoms bound to the polypeptide chain. On the basis of their bimetallocenter composition hydrogenases are divided into three main groups, phylogenetically not related: [NiFe] hydrogenases, [Fe] only hydrogenases and ‘metal – free hydrogenases’ which were described in methanogenic Archaea only. [NiFe] hydrogenases, composed of at least two subunits are well characterized and widely distributed between Archaea and Bacteria but only a few representatives of Clostridium possess this type of enzyme. On the other hand, [Fe] only hydrogenases, being usually monomeric enzymes and restricted to Bacteria and a few eukaryotic species are far less described. These proteins, being omnipresent catalysts of many biological reactions, are especially abundant in Clostridia. The physiological function of Clostridial [Fe] only hydrogenases is to dispose under the form of hydrogen, of the excess of reducing power generated during the fermentation of carbohydrates. The unusual diversity of forms of [Fe] only hydrogenases within Clostridia seems to support the central role of this enzyme in cell metabolism and to facilitate the quick adaptation of the host to changing environmental conditions. Moreover, the presence of multiple putative operons encoding for multisubunit [Fe] only hydrogenases in the genomes of sequenced Clostridium spp. is highlighting the need to study the new, not yet described function of these ostensibly simple proteins. In this project, we have focused our effort on the molecular characterization of key enzymes involved in the process of biohydrogen production with a special interest in Clostridium species. By applying molecular techniques on samples from different kinds of bioreactors, we want to select highly productive species in terms of hydrogen generation. We also believe that gene expression profiling will provide new data on the possible function and activity of different hydrogenases involved in the process. The better understanding of hydrogen metabolism is essential for its sustainable production. [less ▲]

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See detailImpact of contamination on empirical and theoretical error
Ruwet, Christel ULg; Haesbroeck, Gentiane ULg

Conference (2009, June 18)

Classification analysis allows to group similar objects into a given number of groups by means of a classification rule. Many classification procedures are available : linear discrimination, logistic ... [more ▼]

Classification analysis allows to group similar objects into a given number of groups by means of a classification rule. Many classification procedures are available : linear discrimination, logistic discrimination, etc. Focus in this poster will be on classification resulting from a clustering analysis. Indeed, among the outputs of classical clustering techniques, a classification rule is provided in order to classify the objects into one of the clusters. More precisely, let F denote the underlying distribution and assume that the generalized kmeans algorithm with penalty function is used to construct the k clusters C1(F), . . . ,Ck(F) with centers T1(F), . . . , Tk(F). When one feels that k true groups are existing among the data, classification might be the main objective of the statistical analysis. Performance of a particular classification technique can be measured by means of an error rate. Depending on the availability of data, two types of error rates may be computed: a theoretical one and a more empirical one. In the first case, the rule is estimated on a training sample with distribution F while the evaluation of the classification performance may be done through a test sample distributed according to a model distribution of interest, Fm say. In the second case, the same data are used to set up the rule and to evaluate the performance. Under contamination, one has to replace the distribution F of the training sample by a contaminated one, F(eps) say (where eps corresponds to the fraction of contamination). In that case, thetheoretical error rate will be corrupted since it relies on a contaminated rule but it may still consider a test sample distributed according to the model distribution. The empirical error rate will be affected twice: via the rule and also via the sample used for the evaluation of the classification performance. To measure the robustness of classification based on clustering, influence functions of the error rate may be computed. The idea has already been exploited by Croux et al (2008) and Croux et al (2008) in the context of linear and logistic discrimination. In the computation of influence functions, the contaminated distribution takes the form F(eps) = (1 − eps)*Fm + eps* Dx, where Dx is the Dirac distribution putting all its mass at x. It is interesting to note that the impact of the point mass x may be positive, i.e. may decrease the error rate, when the data at hand is used to evaluate the error. [less ▲]

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See detailLa réception de l'approche law & economics par les juristes
Sibony, Anne-Lise ULg

Conference (2009, June 16)

Detailed reference viewed: 35 (1 ULg)
See detailMyopia, redistribution and pensions
Pestieau, Pierre ULg

Conference (2009, June 15)

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See detailDevelopment of multilayered chitosan-based nanofibers
Croisier, Florence ULg; Aqil, Abdelhafid ULg; Detrembleur, Christophe ULg et al

Poster (2009, June 14)

By combining electrospinning and layer-by-layer deposition techniques, new porous material scaffolds of multilayered, chitosan-based nanofibers were produced. Layer-by-layer (LBL) is a well-known method ... [more ▼]

By combining electrospinning and layer-by-layer deposition techniques, new porous material scaffolds of multilayered, chitosan-based nanofibers were produced. Layer-by-layer (LBL) is a well-known method for surface coating, based on electrostatic interactions. It enables the controllable deposition of a variety of polyelectrolytes including synthetic and natural materials, with designable layer structure, defined layer thickness and size. Electrospinning (ESP) allows the fabrication of polymer fibers ranging from nanometers to a few microns in diameter, depending on the polymer characteristics (a.o. molecular weight, solution viscosity and conductivity) and processing conditions (electric potential, distance between syringe-capillary and collection plate, concentration, flow rate). Mats of nanofibers produced by ESP display a very large surface area-to-volume ratio and high porosity with very small pore size. The nanometric scale of electrospun fibers also proves a positive effect on cellular growth, as fiber mats mimic extracellular matrix structure. The association of these two techniques with the use of biocompatible and biodegradable polymers such as chitosan, gives outstanding prospects in the field of biomedical applications, especially for the preparation of wound dressings, artificial skin or tissue engineering scaffolds. In the present study, a charged copolymer, poly(methylmethacrylate-block-methacrylic acid), was added to a poly(ε-caprolactone) or poly(D,L-lactide) solution before electrospinning in order to prepare surface charged nanofibers. Oppositely charged polyelectrolytes – chitosan and poly(styrene sulfonate) or hyaluronic acid – were then alternately deposited on these aliphatic polyester fiber “cores” using LBL method. The aliphatic polyester core was also removed selectively to confirm the growth of a multilayered shell, obtaining hollow fibers. [less ▲]

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See detailNovel Amphiphilic copolymers and design of smart nanoparticule for triggered drug delivery systems
Cajot, Sébastien ULg; Jérôme, Christine ULg

Poster (2009, June 14)

Over the last decade, polymer micelles attracted an increasing interest in drug pharmaceutical research because they could be used as efficient drug delivery systems. Micelles of amphiphilic block ... [more ▼]

Over the last decade, polymer micelles attracted an increasing interest in drug pharmaceutical research because they could be used as efficient drug delivery systems. Micelles of amphiphilic block copolymers are supramolecular core-shell type assemblies of tens of nanometers in diameter. In principle, the micelles core is usually constructed with biodegradable hydrophobic polymers such as aliphatic polyesters, e.g. poly(epsilon-caprolactone) (PCL), which serves as a reservoir for the incorporation of various lipophilic drugs. Water soluble poly(ethylene oxide) (PEO) is most frequently used to build the micelle corona because it is very efficient in preventing protein adsorption at surfaces and in stabilizing the micelles in the blood compartment, giving rise to particles invisible to the body defence system (so-called stealthy or long circulating particles). Improvements of such simple systems however, rely on the development of novel chemistries and materials by advanced macromolecular engineering techniques. The tumour targeting of a cytotoxic agent refers to the passive accumulation of polymer nanocarriers to solid tumours (EPR effect) followed by active internalization in tumor cells. The internalization of the drug is required for cell death because most cytotoxic drugs act intracellularly. Accordingly, polymer micelles are usually modified by specific ligands. However, these ligands can decrease the micelles stealthiness and stability. No-specific ligands can be used if their exposition is modulated by the pH decrease typical of tumour tissues. Lipophilic drugs are generally incorporated in the hydrophobic core of the micelles. The release of the drug is ruled by diffusion and degradation of the biodegradable polymer used as reservoir. Even if micelles get a high stability in aqueous media thanks to their low critical micellar concentration, the dissociation of micelles is not always preserved when they are injected in the blood compartment. The cross-linking of the core of micelles by disulfide bridges will provide the stability of micelles after the administration and will release the drugs intracellularly by enzymatic breaking of disulfide bridges. This work consists in the development of new macromolecular architectures for the targeting of tumour cells. pH sensitive copolymers able to micellize so as non-specific ligand like biotin is exposed on their surface in response to pH decrease typical for tumour tissues will be synthesized by the incorporation of pH-sensitive linkers like hydrazone or imine benzoïc linkers. In addition, the core of these new micelles will be cross-linked by disulfide bridges to prevent dissociation around healthy cells and trigger the drug release inside tumour cells. [less ▲]

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See detailEvolution of the surface chemistry of carbon xerogels with very different textural properties by chemical activation and oxidation
Zubizarreta, Leire; Arenillas, A.; Pirard, Jean-Paul ULg et al

Poster (2009, June 14)

Detailed reference viewed: 22 (1 ULg)
See detailEDLC electrodes from cellulose-based carbon aerogels : influence of the carbon's surface chemistry
Hildenbrand, Claudia; Grzyb, B.; Berthon-Fabry, S. et al

Poster (2009, June 14)

Detailed reference viewed: 13 (1 ULg)
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See detailDesign of thermoresponsive magnetic nanoparticles for hyperthermia
Sibret, Pierre ULg; Aqil, Abdelhafid; Jérôme, Christine ULg

Poster (2009, June 14)

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See detailCarbon xerogels as supports for catalysts and electrocatalysts
Job, Nathalie ULg; Berthon-Fabry, S.; Lambert, Stéphanie ULg et al

Conference (2009, June 14)

Detailed reference viewed: 12 (2 ULg)
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See detailStudy of diffusive limitations in Proton Exchange Membrane Fuel Cells (PEMFC)
Brigaudet, M.; Berthon-Fabry, S.; Beauger, C. et al

Conference (2009, June 14)

Detailed reference viewed: 7 (3 ULg)
Peer Reviewed
See detailValidité et objectivité entre logique et phénoménologie
Boccaccini, Federico ULg

Conference (2009, June 13)

Detailed reference viewed: 10 (1 ULg)
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See detailDevelopment of multilayered chitosan-based nanofibers for tissue engineering
Croisier, Florence ULg; Aqil, Abdelhafid ULg; Detrembleur, Christophe ULg et al

Conference (2009, June 13)

By combining electrospinning and layer-by-layer deposition techniques, new porous material scaffolds of multilayered, chitosan-based nanofibers were produced. Layer-by-layer (LBL) is a well-known method ... [more ▼]

By combining electrospinning and layer-by-layer deposition techniques, new porous material scaffolds of multilayered, chitosan-based nanofibers were produced. Layer-by-layer (LBL) is a well-known method for surface coating, based on electrostatic interactions. It enables the controllable deposition of a variety of polyelectrolytes including synthetic and natural materials, with designable layer structure, defined layer thickness and size. Electrospinning (ESP) allows the fabrication of polymer fibers ranging from nanometers to a few microns in diameter, depending on the polymer characteristics (a.o. molecular weight, solution viscosity and conductivity) and processing conditions (electric potential, distance between syringe-capillary and collection plate, concentration, flow rate). Mats of nanofibers produced by ESP display a very large surface area-to-volume ratio and high porosity with very small pore size. The nanometric scale of electrospun fibers also proves a positive effect on cellular growth, as fiber mats mimic extracellular matrix structure. The association of these two techniques with the use of biocompatible and biodegradable polymers such as chitosan, gives outstanding prospects in the field of biomedical applications, especially for the preparation of wound dressings, artificial skin or tissue engineering scaffolds. In the present study, a charged copolymer, poly(methylmethacrylate-block-methacrylic acid), was added to a poly(ε-caprolactone) or poly(D,L-lactide) solution before electrospinning in order to prepare surface charged nanofibers. Oppositely charged polyelectrolytes – chitosan and poly(styrene sulfonate) or hyaluronic acid – were then alternately deposited on these aliphatic polyester fiber “cores” using LBL method. The aliphatic polyester core was also removed selectively to confirm the growth of a multilayered shell, obtaining hollow fibers. [less ▲]

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See detailIN VITRO CLONAL PROPAGATION OF A PROMISING AGROFUEL PRODUCING-PLANT : JATROPHA CURCAS L.
Medza Mve, Samson Daudet ULg; Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg et al

Poster (2009, June 13)

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and ... [more ▼]

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and Skoog’s (MS) basal medium supplemented with N6-benzyladenine (BA) and adenine sulphate. This medium allowed the production of 3.1 ± 0.5 shoots per nodal explant with 3.5 ± 0.8 cm average length after 3-4 weeks. [less ▲]

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See detailClean Development Mechanisms (CDM) and Sustainable Development in South Countries
Ozer, Pierre ULg

Conference (2009, June 13)

The Clean Development Mechanism (CDM) allows emission-reduction (or emission removal) projects in developing countries to earn Certified Emission Reduction (CER) credits, each equivalent to one tonne of ... [more ▼]

The Clean Development Mechanism (CDM) allows emission-reduction (or emission removal) projects in developing countries to earn Certified Emission Reduction (CER) credits, each equivalent to one tonne of CO2. These CERs can be traded and sold, and used by industrialized countries to a meet a part of their emission reduction targets under the Kyoto Protocol. The mechanism stimulates sustainable development and emission reductions, while giving industrialized countries some flexibility in how they meet their emission reduction limitation targets. Accepted projects must qualify through a rigorous and public registration and issuance process designed to ensure real, measurable and verifiable emission reductions that are additional to what would have occurred without the project. Between November 2004 and May 2009, the mechanism has registered 1653 projects and is anticipated to currently produce CERs amounting to 303 106 tonnes of CO2 equivalent yearly. The mechanism is extremely interesting since it is the first global, environmental investment and credit scheme of its kind, providing a standardized emissions offset instrument. However the geographical distribution of the CDM projects is revealing very large differences in between developing countries since China, India, Brazil and South-Korea totalise 82% of the CERs while Africa only represents 3,3% of the total. [less ▲]

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See detailTowards an optimal enforcement of Competition rules in Europe
Petit, Nicolas ULg

Conference (2009, June 12)

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See detailTargeted proteomics of nascent RNP particles: A role for DBC1 and ZNF326 in linking mRNA splicing to RNAPII
Close, Pierre ULg; East, P; Svejstrup, J. Q.

Poster (2009, June 12)

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See detailA risk-based approach for designing climate-proof flood protection
Ernst, Julien ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

Poster (2009, June 12)

In the framework of the Belgian national research project “ADAPT - Towards an integrated decision tool for adaptation measures”, a risk-based decision-support system (DSS) is developed with the aim of ... [more ▼]

In the framework of the Belgian national research project “ADAPT - Towards an integrated decision tool for adaptation measures”, a risk-based decision-support system (DSS) is developed with the aim of selecting the most cost-effective flood protection strategies. Based on detailed 2D hydraulic modelling combined with high resolution and high accuracy land use database as well as socio-economic datasets, integrated risk analysis is conducted to evaluate the benefits of different flood protection measures. The tool is dedicated to the integrated evaluation of flood management strategies in the context of increased flood risk as a result of climate change, considering hydraulic, economic, social as well as environmental parameters to quantify both the benefits (in terms of avoided risk) and the cost of each strategy. While such risk analyses are mostly undertaken at a macro- or meso-scale, the present approach is performed at a micro-scale, meaning that the considered assets are the individual buildings or facilities. The methodology relies on a consistent approach in terms of accuracy of input data, hydraulic modelling and expected results. Indeed, besides detailed hydraulic modelling conducted on computational grids as fine as 2m by 2m, exploited data include laser altimetry (LIDAR), high resolution and high quality land use maps as well as other complementary vector geographic datasets providing socioeconomic information at a micro-scale. Next to the flow modelling and the exposure analysis conducted for each building or facility individually, the procedure involves social impact analysis (accounting for social vulnerability and adaptive capacity of communities) and the evaluation of direct economic damage based on different relative damage functions. The outcomes of this risk analysis are subsequently exploited in the DSS to evaluate the effectiveness of individual flood protection measures. Finally all costs and benefits (avoided risk) are combined to enable the evaluation of flood protection strategies. Every scenario for which benefits outweigh costs potentially adds to welfare. The scenario with the highest contribution per Euro invested should ideally be realised first. The extended cost-benefit analysis is complemented by uncertainty and sensitivity analyses of the results. The applicability of the overall automatic procedure is demonstrated by the evaluation of inundation hazard, exposure and flood risk for a case study along river Ourthe in the Meuse basin (Belgium). For validation purpose, recent flood events are first simulated and a base scenario is considered. Next, the effectiveness of a number of flood protection measures is evaluated. [less ▲]

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See detailDevelopment of a protocol for micropropagation of Jatropha curcas L
Medza Mve, Samson Daudet ULg; Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg et al

in Fifth International Conference on Renewable Resources and Biorefineries (2009, June 11)

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and ... [more ▼]

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and Skoog’s (MS) basal medium supplemented with N6-benzyladenine (BA) and adenine sulphate. This medium allowed the production of 3.1 ± 0.5 shoots per nodal explant with 3.5 ± 0.8 cm average length after 3-4 weeks. [less ▲]

Detailed reference viewed: 22 (5 ULg)
See detailIR spectroscopy of DNA structures
Gabelica, Valérie ULg

Conference (2009, June 11)

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See detailMaternal transfer of mercury to offspring in phocids
Habran, Sarah ULg; Pomeroy, Paddy; Debier, Cathy et al

Conference (2009, June 09)

Marine mammals may display high mercury (Hg) levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Indeed, Hg could be transferred from ... [more ▼]

Marine mammals may display high mercury (Hg) levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Indeed, Hg could be transferred from mothers to fetuses via the placenta and to suckling pups via the milk, potentially affecting them during their most sensitive periods of development. Some lactating female phocids fast during the suckling period. This fasting period involves not only an important mobilization of energy reserves, but also mobilization of potentially associated contaminants. We studied and compared maternal transfer of Hg to offspring in two phocid species: the northern elephant seal (Mirounga angustirostris) from the Californian coast and the grey seal (Halichoerus grypus) from the Isle of May in Scotland. Total mercury concentrations (THg) were measured in whole blood and maternal milk of 20 mother-pup pairs of each species in early and late lactation. Methylmercury (MeHg) levels were also measured in the blood and milk of grey seals. Results indicated that Hg passed from the maternal tissue into the phocid milk. Milk showed a range of THg levels from 15 to 60 ppb (ng.g-1-wet-weight). From the first days after birth, pups displayed relatively high blood Hg levels suggesting that a Hg transfer through placenta occurred. Blood Hg levels in mothers and pups also varied significantly throughout lactation. While maternal levels doubled, pup levels were reduced by half between the beginning and the end of lactation. Remobilization of proteins and lipids during fasting and milk production in mothers might lead to a release of Hg in blood and therefore increase the levels in late lactation. On the contrary, Hg would be progressively stored in pup organs during their development. Decreasing Hg levels in pups also suggest that the Hg intake via the milk might be lower than that via the placenta. This study highlights a transplacental and transmammary transfer of Hg in both phocid populations. However, further toxicology studies are needed to help understand the potential impact of this Hg transfer. Results also showed that physiological processes such as lactation and/or fasting can modify Hg levels in the blood of mothers and pups. Therefore, such processes and body condition should be considered carefully when interpreting Hg levels in the framework of biomonitoring. [less ▲]

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See detailMethylmercury in vitro exposure of harbor seal (Phoca vitulina) lymphocytes: a multidisciplinary approach
Dupont, Aurélie ULg; Siebert, Ursula; Rosenberger, Tanja et al

Poster (2009, June 08)

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See detailStudy of vocal therapy efficiency: Comparison of 2 methods
Morsomme, Dominique ULg; Vliegen, Liz; MARTINOT, Gisèle ULg

Conference (2009, June 06)

Our objective is to compare the efficiency of 2 methods of vocal therapy. Method A consists of exercises centred on the breath, the vibration and the resonance. Method B associates the principles of the ... [more ▼]

Our objective is to compare the efficiency of 2 methods of vocal therapy. Method A consists of exercises centred on the breath, the vibration and the resonance. Method B associates the principles of the muscular chains (Struyf) and the motor coordination ( Piret-Béziers) with the eutonia of G. Alexander. 11 patients (mean age: 32.9) presenting a functional dysphonia or nodules of the vocal folds were distributed in both groups. We compared their results pre and post therapy (interval: 6 months) at subjective (GRB, VHI) and objective (acoustics and aerodynamics) measures. We observe an improvement of the post therapeutic measures in both groups (VHI p < 0.005; maximum intensity p < 0.05; intensity range p < 0.05; frequency range p<0.05 and maximum frequency p< 0.05). We observe an improvement of the post therapeutic measures for the group A for the grade and the roughness on a sustained [a] ( p < 0.05) and for the grade, the roughness and the breathiness on text reading (p < 0.05). Both methods are equivalent to improve the vocal quality of the dysphonic patients in this study. [less ▲]

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See detailDISLOCATIONS AS DEVELOPMENTAL MARKERS IN THE FRENCH LANGUAGE : DEVELOPMENTAL AND PATHOLOGICAL STUDIES
Maillart, Christelle ULg; Parisse, Christophe; Gay-Perret, Nathalie

Poster (2009, June 06)

Detailed reference viewed: 38 (5 ULg)
See detailIntroduction et conclusions
Delfosse, Annick ULg

Conference (2009, June 05)

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See detailChildren with specific language impairment are impaired on implicit higher-order sequence learning, but not on implicit spatial context learning.
Gabriel, Audrey ULg; Schmitz, Xavier; Maillart, Christelle ULg et al

Poster (2009, June 05)

In a recent review of the SLI literature it has been suggested that low language and grammatical abilities would be directly associated with poor learning abilities of nonverbal sequences (Ullman ... [more ▼]

In a recent review of the SLI literature it has been suggested that low language and grammatical abilities would be directly associated with poor learning abilities of nonverbal sequences (Ullman & Pierpont, 2005; Tomblin et al., 2007). Therefore, one could hypothesize that a general purpose sequential pattern tracker could determine some aspects of language and grammar learning. In the present study, 15 children with SLI and 15 matched control children were compared on two implicit learning tasks: an alternating serial response time task in which sequential dependencies exist across non-adjacent elements, and a spatial context learning task in which the global configuration of a display cues the location of a searched target (Chun & Jiang, 1998). We predict that children with SLI will show impaired sequence learning and normal spatial context learning. By confirming the presence of a specific deficit in sequential learning processes, the present study should contribute to better understand the language abilities, and in particular the grammatical difficulties, of individuals with specific language impairment. [less ▲]

Detailed reference viewed: 188 (37 ULg)
See detailOxylipin profiles of Solanum esculentum and Solanum pennellii under salt stress conditions
Ghars, Mohamed Ali ULg; Frettinger, P.; Ghanem, M. E. et al

Poster (2009, June 05)

Detailed reference viewed: 52 (0 ULg)
Peer Reviewed
See detailA simple method for determination of electrospray response factors of noncovalent complexes: application to DNA G-quadruplex binding and self-assembly
Gabelica, Valérie ULg; Amato, Jussara; Oliviero, Giorgia et al

Conference (2009, June 04)

Introduction Electrospray mass spectrometry (ESI-MS) is now widely used to investigate non-covalent assemblies, and the power of the method resides in the individual detection of the various ... [more ▼]

Introduction Electrospray mass spectrometry (ESI-MS) is now widely used to investigate non-covalent assemblies, and the power of the method resides in the individual detection of the various stoichiometries present in the mixture. However, to characterize the mixture quantitatively (i.e. to determine the concentration of each constituent), the biggest challenge comes from the fact that electrospray response factors of all constituents can be different, especially for constituents of significantly different masses and charges. Here we present a novel and simple method to determine the response factors of all constituents, using an internal standard. The method can be transposed to a wide variety of biological problems and to different ionization methods. Experimental All oligodeoxynucleotides were purchased from Eurogentec (Seraing, Belgium). G-quadruplexes formation is induced by addition of ammonium acetate (150 mM) to the guanine-rich strand. Polythymines (e.g. dT6) with m/z not overlapping with those of the complexes were used as internal standards. The ESI mass spectra were acquired using a Q-TOF Ultima Global (Waters, Manchester, UK) in the negative ion mode, with source parameters optimized for detecting the intact complexes. Quadruplex-ligand binding constants were quantified by titration of the quadruplex with the ligand (BOQ1, Dr. Teulade-Fichou). The kinetics of G-quadruplex self-assembly was monitored on-line, with the starting time defined by the addition of ammonium to the single strand. Peak areas were calculated using MassLynx and data were processed using Mathcad. Preliminary results Let us illustrate the method for the characterization of the self-assembly of dCGGTGGT. In NH4OAc, this G-rich strand forms a tetramer within a few hours, but the most stable species is an octamer, which is formed after a few days. The relative intensities of monomer, tetramer and octamer vary with the experimental settings: harsher conditions favor the transmission of the larger complexes. It is therefore foolish to assume that the response factors of the monomer, tetramer and octamer are equal. Using dT6 as an internal reference, we monitored the self-assembly kinetics by recording at several time points the following intensities: I(ref2-), I(G12-), I(G45-) and I(G89-), where Gn indicates a complex containing n G-rich strands. For each species Gn, we define Rn as its response factor relative to that of the reference: [Gn]/[ref] = Rn * I(Gn)/I(ref). At each time point the mass balance equation for the strand concentration must be satisfied: [G]tot = [G1] + 4[G4] + 8[G8]. Substituting with the definition of Rn’s one obtains a set of equations: [G]tot = [ref] * {R1*(I(G1)/I(ref) + 4R4*I(G4)/I(ref) + 8R8*I(G8)/I(ref)}. If the number of equations (time points) is greater than the number of unknown response factors, the least-squares fit to this system of equations is calculated using the Moore-Penrose pseudoinverse of the matrix constituted by the intensity ratios. Once all response factors are known, concentrations are recalculated at each time point, providing detailed characterization of the reaction kinetics, including reaction intermediates. We will also show that the same method can be used to quantify ligand binding using titration of the substrate by the ligand. This will be illustrated with titration of the quadruplex (TGGGGT)4 by ligand BOQ1. This ligand binds to the quadruplex and also produces ligand-bridged quadruplex multimers, which the present method allows quantifying for the first time. [less ▲]

Detailed reference viewed: 96 (1 ULg)
See detailMéditations sartriennes de Bourdieu
Cormann, Grégory ULg

Conference (2009, June 04)

Detailed reference viewed: 27 (7 ULg)
See detailImages et pathos. Figures de la créativité chez Aby Warburg
Hagelstein, Maud ULg

Conference (2009, June 03)

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See detailMental health and emotions in couples with an alcoholic member
Dethier, Marie ULg; Counerotte, Christelle; Blairy, Sylvie ULg

Poster (2009, June 03)

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See detailA theoretically motivated approach of receptive language assessment based on an interactive spreading activation account of language processing
Martinez Perez, Trecy ULg; Majerus, Steve ULg; Delvenne, Marie-Anne ULg et al

Poster (2009, June 03)

In French language, existing tests do not provide a sensitive assessment of auditory comprehension impairments in aphasic patients. These tests don’t detect slight deficits because their a limited number ... [more ▼]

In French language, existing tests do not provide a sensitive assessment of auditory comprehension impairments in aphasic patients. These tests don’t detect slight deficits because their a limited number of tasks and items. Our aim was to construct a series of more sensible tasks to assess auditory perception. Our battery consists on of phonological, lexical, semantic and verbal short-term memory tasks with a high number of items for each test. The computerization of tasks allows to measure correct answers and time latency and allows a standardized assessment. Our poster will focus on our assessment tasks of auditory comprehension, performances pattern of our aphasic patient and underlying theoretical models. [less ▲]

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See detailA test of the Job Demands-Resources model: A social identity theory perspective.
Barbier, Marie ULg; Hansez, Isabelle ULg

Conference (2009, June 03)

The Job Demands-Resources mode has given rise to numerous studies aimed at a better understanding of positive and negative aspects of wellbeing at work. The existence of a motivational and an energetic ... [more ▼]

The Job Demands-Resources mode has given rise to numerous studies aimed at a better understanding of positive and negative aspects of wellbeing at work. The existence of a motivational and an energetic process leading to, respectively, engagement and exhaustion has been demonstrated. The aim of our study is to test this model using predictors derived from Social Identity Theory (or SIT). We hypothesize that working in a negatively valued occupation is associated with exhaustion and health problems, whereas a high identification with one’s occupational group is associated to engagement and low intent to quit the organisation (or IQ). Structural equation modelling was performed on data collected in a public administration (N = 954). We collected measures of occupation value, group identification, exhaustion, engagement, health problems and IQ. Items were parcelled based on their skewness. Excepted from Chi² being significant (p = .00), fit indices were satisfactory. The link between engagement and IQ is not significant but all other links go in the expected direction. We conclude that a test of the JDR model using SIT brings conclusive results. As a further step, it might be interesting to test interactive effects: results suggest that identification might buffer the relation between occupation value and exhaustion. Second, it might be interesting to introduce boundaries permeability, another key concept of SIT, as a third predictor. [less ▲]

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See detailMemory for visual items of central or marginal interest in complex scene: Impact of eye movements and subject’s expertise.
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2009, June 03)

In complex scene, memory for central interest items is better than memory for marginal interest items and this difference remains stable independently of the scene presentation duration (Melcher, 2006 ... [more ▼]

In complex scene, memory for central interest items is better than memory for marginal interest items and this difference remains stable independently of the scene presentation duration (Melcher, 2006). However, without eye movement recording, it is not possible to know whether central interest items are better remembered because they are more fixated or because they are more meaningful. To answer this question, we analysed the memory of complex scenes (paintings) according to the eye movements and subjects’ expertise. 15 novice subjects and 15 art historians (experts) were asked to look at 6 paintings that were separately and randomly presented for 10 seconds. After each painting presentation, subjects were asked questions about pictorial details of 3 categories: details of central or marginal interest and background information. Although experts had prior knowledge about the paintings, the accuracy of answers about the pictorial details did not differ between both groups: all subjects showed best memory for central information while they failed to remember background information and marginal details. Despite a longest time spent in the background zone, memory for these details was poorer than for central interest items, suggesting the importance of the meaning over the fixation duration. Eye movement recordings also showed novice’s answers were more accurate when they looked longer at the asked detail and when this detail was watched early on in the presentation while in the expert group, the accuracy of the answer was not influenced by the duration and moment they watched the asked detail. [less ▲]

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See detailEffects of time of day on age-related differences in cognitive tests.
Schmitz, Xavier ULg; Willems, Sylvie ULg; Meulemans, Thierry ULg

Poster (2009, June 03)

Previous studies have shown a shift in the circadian rhythm – and more particularly in the optimal time of day (OTD) – across the adult life span (May et al., 1993). The aim of this study was to ... [more ▼]

Previous studies have shown a shift in the circadian rhythm – and more particularly in the optimal time of day (OTD) – across the adult life span (May et al., 1993). The aim of this study was to investigate the relationship between cognitive efficiency and OTD in 113 healthy old adults (Age: M = 69, SD = 6.1, Range = 60-80) and 175 younger adults (M = 40.8, SD = 12.9, Range = 20-59). Participants performed a large battery of cognitive tests that assessed episodic memory, working memory, executive and attentional functions. Results on the MEQ (Morningness-Eveningness Questionnaire; Horne & Östberg, 1976) confirmed the age-related shift toward a self-reported morning preference in older adults. Second, the categorization of participants according to their MEQ scores and the time of testing revealed that the OTD has a greater impact upon cognitive performance in older than in younger adults. Third, the age-related OTD impact was more striking in working memory (Brown-Peterson and Pasat) and episodic memory tasks (Buschke) than in other aspects of the cognitive functioning. In conclusion, older participants tested during their peak circadian periods tend to show greater performance on memory tasks that require careful or strategic processing relative to older participants who are tested at off-peak times of day. Taken together, these findings indicate that care must be taken when investigators are considering the effects of age on effortful memory tasks, which are particularly modulated by OTD in older adults. [less ▲]

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See detailNew developments in the functionalization of aliphatic polyesters by "click" copper-catalyzed azide-alkyne cycloaddition
Lecomte, Philippe ULg; Riva, Raphaël ULg; Schmeits, Stephanie ULg et al

Conference (2009, June 03)

Nowadays, biodegradable and biocompatible aliphatic polyesters are widely used as environmentally friendly thermoplastics and biomaterials. Nevertheless, the absence of any pendant functional group is a ... [more ▼]

Nowadays, biodegradable and biocompatible aliphatic polyesters are widely used as environmentally friendly thermoplastics and biomaterials. Nevertheless, the absence of any pendant functional group is a severe limitation for the development of novel applications. Our strategy aiming at functionalizing aliphatic polyesters relies on the “click” copper-catalyzed cycloaddition (CuAAC) of alkynes duly substituted by functional groups or even chains onto PCL bearing pendant azides. The aliphatic polyesters bearing pendant azides have been very efficiently synthesized by a straightforward approach, which relies on the ring-opening copolymerization of αClεCL (or γBrεCL) and εCL (or lactide) followed by reaction with sodium azide to convert pendant chlorides or bromides into azides. The alternative reported by Emrick et al. is based on the CuAAC reaction of azides substituted by any functional group onto copolyesters of poly(ε-caprolactone) bearing pendant alkynes. Interestingly enough, Emrick et al. carried out the CuAAc reaction in water at 80°C. Unfortunately, it turned out, at least in our hands, that these conditions can not be extended to the derivatization of more sensitive aliphatic polyesters because degradation was then unavoidable. Nevertheless, we found out that degradation can be minimized whenever the CuAAC reaction is carried out in an organic solvent at lower temperature. Typically, the CuAAC reaction was carried out in DMF or THF at 35°C. Recently, it was shown that supercritical carbon dioxide can be used as a more environmentally friendly solvent than DMF or THF. The contamination by catalytic residues of aliphatic polyesters functionalized by the CuAAC reaction is a severe limitation in view of future applications, especially in the biomedical field. In the last part of this talk, a special attention will be paid on our current efforts to get rid of copper residues. [less ▲]

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See detailPilot scale biotransformation of vegetal oil into natural green note flavor using sugar beet leaves as sources of hydroperoxide lyase
Gigot, Cédric ULg; Ongena, Marc ULg; Fauconnier, Marie-Laure ULg et al

Poster (2009, June 02)

Natural green note aromas (GLVs) are highly attractive flavors commonly used in the food industry. These are produced in extremely low levels upon physiological stress in plant organs of any sort. This ... [more ▼]

Natural green note aromas (GLVs) are highly attractive flavors commonly used in the food industry. These are produced in extremely low levels upon physiological stress in plant organs of any sort. This weak sporadic presence entails a very expensive extraction step to obtain pure GLVs. Therefore catalytic biotransformations of fatty acid sources, the initial substrate for GLVs, have been developed. Enzymatic defense pathways and particularly the LOX pathway produce the major part of GLVs. Unlike GLV molecules that are emitted in the atmosphere, the enzymes are extractible from the plant material. Thus, a combination of plant enzyme extracts and substrate preparations provides all the ingredients for GLV production. Besides, sugar beet leaves present high levels of hydroperoxide lyase among plant sources and are available in large amounts during three months. In this enzymatic pathway, fatty acids are successively transformed by lipase, lipoxygenase and hydroperoxide lyase into aldehydes and alcohols, final compounds of GLVs pathway. Limiting and problematic steps occur with the action of hydroperoxide lyase, when enzymatic catalysis is followed by an enzyme destabilization. Alternative substrates bind irreversibly to the heme group of the enzyme and end the reaction. This poster briefly describes the development of a complete bioprocess for natural GLV production, from hydrolysis to purification. A high level of biotransformation could be achieved using optimum experimental conditions and a cheap source of plant materials. [less ▲]

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See detailEco-efficiency methodology of Hybrid Electric Vehicle based on multidisciplinary multi-objective optimization
Nzisabira, Jonathan; Louvigny, Yannick ULg; Christiaens, Sébastien et al

in Proceeding of the 8th World Congress on Structural and Multidisciplinary Optimization (2009, June 01)

The eco-efficiency concept of clean propulsion vehicles aims at is simultaneously reducing the fuel consumption and environment pollutants impact (Eco-score) without decreasing the vehicle performances ... [more ▼]

The eco-efficiency concept of clean propulsion vehicles aims at is simultaneously reducing the fuel consumption and environment pollutants impact (Eco-score) without decreasing the vehicle performances and other user satisfaction criteria. Based on a simulation model in ADVISOR, one can evaluate the performances, the emissions and then the Ecoscore and the User Satisfaction for different driving scenarios. To establish a rationale methodology for conducting the eco-efficiency design of electric and hybrid vehicles, we adopt a multidisciplinary optimization approach while minimizing / maximizing both Ecoscore and User satisfaction objective functions. The proposed approach is then illustrated on the case study of the comparison of different mild parallel hybrid buses (hybrid electric vehicle (HEV) and hybrid hydraulic vehicle (HHV) by highlighting the effect of different energy storage systems (batteries, ultra capacitors, hydraulic system), mechanical and electric components sizes upon the optimized hybrid design. The optimization results show that the hybrid electric buses using ultra capacitors have almost the same performances as those using batteries, while the HHV technology can compete with HEV because of the hydraulic components low cost and recyclability if possibly using of water as motor/pump fluid. [less ▲]

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See detailRelative serum protein quantification based upon ICPL and 2D-LC-MS identifies potential frailty biomarkers in elderly patients
Turtoi, Andrei ULg; Mazzucchelli, Gabriel ULg; Dobson, Rowan ULg et al

Poster (2009, June 01)

This study shows the ability of the ICPL and nano-HPLC-MS/MS to perform relative quantification and identification of serum protein biomarkers. Frailty is a geriatric syndrome that is commonly associated ... [more ▼]

This study shows the ability of the ICPL and nano-HPLC-MS/MS to perform relative quantification and identification of serum protein biomarkers. Frailty is a geriatric syndrome that is commonly associated with the decline in multisystemic reserve, cognition and sensory capabilities. It is negatively influencing the outcome of a disease prolonging the patient’s recovery. The discrepancy between the actual and the biological age brings the uncertainty of predicting frailty in a given individual. This study is addressing the problem of finding suitable biomarkers that bear the ability to objectively predict frailty in elderly patients. It furthermore provides a robust method for reliable relative quantification of serumproteins. Serum samples used in this study were divided into six groups regarding the patient’s disease (hip-fracture, infection and cardiac decompensation) and frailty status (frail or robust). The individual sera were pooled and a volume of 20 µL was depleted of high abundantproteins. After labeling with ICPL (isotope coded protein label), serum proteins were fractionated according to their respective pI (0-3, 4-7 and 8-12). The samples were further subjected to tryptic digestion followed by the treatment with the Glu-C enzyme. The peptides were analyzed on the 2D-nano-HPLC system (Ulimate 3000®) using four different concentrations of salt injections (45, 75, 150 and 500 mM ammonium acetate). The HPLC system was connected on-line with the electrospray ion-trap mass spectrometer Esquire HCT ultra®. The relative protein quantification using ICPL and mass spectrometry allowed for comparison of six patient groups with respect to a standard sample. The latter represented a group of healthy old subjects. This technique allowed for the detection of approx. 200 proteins, whereas about 50 % of those contained the ICPL label and could therefore be quantified. The identified proteins covered 3 – 4 orders of magnitude ofprotein concentration in human serum. Several proteins displayed a significant modulation allowing for some preliminary conclusions to be drawn. At this point it can be stated that significantly elevated levels of C-reactive protein (factor 12) and alpha-1-antichimotrypsin (f. 4) proved to be potentially good indicators of frailty. Increased concentrations of alpha-1-microglobulin (f. 4) and alpha-2HS-glycoprotein (f. 2) have been found in the robust patients, whereas no significant concentration alteration could be detected in the frail groups. These results refer to the acute phase response since the samples were collected immediately after patient hospitalization. Current investigations addressing the later sampling times should shed more light on the suitability of these markers to predict frailty in elderly patients. At this stage it is obvious that although several markers are found to be in common for all the frail or robust patients, the disease status additionally complicates the biomarker signature. Therefore a more individualized approach should also be considered, where depending on the age and clinical findings a more defined group of markers should be selected to address the problem of frailty. [less ▲]

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See detailLa validité de construit des épreuves physiques qui mesurent l’aptitude physique générale sportive des candidats pour une formation en sport au Maroc et en Algérie
Alem, Jaouad; Dadouchi; Kerfes, Nabil et al

Poster (2009, June)

A l’instar de certains chercheurs en sciences de l’éducation qui ont tenté de démontrer l’existence d’un facteur unique d’intelligence générale G, certains kinésiologues ont, eux aussi, longtemps cru en ... [more ▼]

A l’instar de certains chercheurs en sciences de l’éducation qui ont tenté de démontrer l’existence d’un facteur unique d’intelligence générale G, certains kinésiologues ont, eux aussi, longtemps cru en l’existence d’un facteur unique d’aptitude physique générale sportive (Thomas, 1989). Cette recherche analyse la validité de construit des épreuves physiques censées mesurer l’aptitude physique générale des candidats pour une formation supérieure en sport au Maroc (7 épreuves) et en Algérie (4 épreuves). La base de données est composée de 990 candidats masculins du Maroc et 491 de l’Algérie, âgés en moyenne de 20 ans. Les analyses factorielles en composantes principales avec rotation varimax des performances à ces épreuves aussi bien selon le genre des candidats que selon leur spécialité sportive révèlent systématiquement une solution factorielle en deux composantes qui se distinguent selon la durée du travail pour produire de l’énergie et qui prédisent plus de 50% de la variance du construit mesuré. La 1ière composante correspond à la puissance musculaire phosphagénique ou encore à la capacité de produire en moins de sept secondes du phosphate déjà présent dans les muscles, elle est définie par les autres épreuves physiques. La 2ième composante correspond à la puissance musculaire glycolytique ou encore à la capacité de produire du lactate en plus de 12 secondes, elle est définie par la course de vitesse et la course de résistance. Nos analyses n’ont pas démontré la validité de construit de 7 ou 4 dimensions différentes d’aptitude physique sportive mais plutôt l’existence de deux composantes différentes de la puissance musculaire. [less ▲]

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See detailExperimental and Numerical Investigation of Mixed Flow in a Gallery
Erpicum, Sébastien ULg; Kerger, François ULg; Archambeau, Pierre ULg et al

in Transaction: Engineering Sciences, volume 1, Computational Methods in Multiphase Flow V (2009, June)

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See detailDoes Time Influence Reproducibility of the Roland-Morris Disability Questionnaire?
Smeets, Rob; Demoulin, Christophe ULg; Knottnerus, André

in Abstract book of the Boston International Forum X - Primary Care Research on low back pain (2009, June)

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See detailHigh-resolution respirometry to assess muscle mitochondrial respiratory function in horses: potential applications in sport and myopathic horses
Votion, Dominique ULg; Gnaiger, Erich; Lemieux, Hélène et al

in In Proceedings: 3rd MiPsummer School, Baton Rouge, USA (2009, June)

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See detailA new diagnostic tool for in vitro allergy
Gadisseur, Romy ULg; Chapelle, Jean-Paul ULg; Cavalier, Etienne ULg

in Allergy (2009, June), 64

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See detailEvaluation of the dynamic adsorption of gas on active carbon beds using in situ X-ray µ-tomography coupled with 3D image analysis
Almazan, Maria del Carmen; Léonard, Angélique ULg; Lodewyckx, Peter et al

Poster (2009, June)

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See detailTheoretical Study of Transformation Mechanism for the Corundum-to-Rh2O3(II) Transition in Al2O3
Xu, Bin ULg; Dong, Jianjun; Stokes, Harold et al

Poster (2009, June)

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See detailInterest of Locometrix to assess gait’s profile in specific old populations
Gillain, Sophie ULg; Warzee, Emmanuelle ULg; Lekeu, Françoise ULg et al

in Journal of Nutrition, Health & Aging (The) (2009, June), 13(Supp 1),

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See detailWhich variables are related to residents' ability to detect patients' distress
Meunier, J.; Libert, Y.; Merckaert, I. et al

in Psycho-oncology (2009, June), 18 (Suppl. 2)

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See detailA system-level model reduction technique for efficient simulation of flexible multibody dynamics
Heirman, Gert H.K; Bruls, Olivier ULg; Desmet, Wim

in Proceedings of the Multibody Dynamics ECCOMAS Conference (2009, June)

In flexible multibody dynamics, body-level model reduction is typically used to decrease the computational load of a simulation. Body-level model reduction is generally performed by means of Component ... [more ▼]

In flexible multibody dynamics, body-level model reduction is typically used to decrease the computational load of a simulation. Body-level model reduction is generally performed by means of Component Mode Synthesis. This offers an acceptable solution for many applications, but does not result in significant model reduction for systems with moving connection points, e.g. due to a flexible sliding joint. In this research, Global Modal Parametrization, a model reduction technique initially proposed for real-time control of flexible mechanisms, is further developed to speed up simulation of multibody systems. The reduction is achieved by a system-level modal description, as opposed to the classic body-level modal description. As the dynamics is configuration-dependent, the system-level modal description is chosen configuration-dependent in such a way that the system dynamics are optimally described with a minimal number of degrees of freedom. Moving connection points do not pose a problem to the proposed model reduction methodology. The complexity of simulation of the reduced model equations is estimated. The applicability to systems with moving connection points is highlighted. In a numerical experiment, simulation results for the original model equations are compared with simulation results for the model equations obtained after model reduction, showing a good match. The approximation errors resulting from the model reduction techniques are investigated by comparing results for different mode sets. The mode set affects the approximation error similarly as it does in linear modal synthesis. [less ▲]

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See detailFirst-Principles Study of the Mechanism for B4-to-B1 Phase Transformation in AlN
Xu, Bin ULg; Dong, Jianjun; Stokes, Harold et al

Poster (2009, June)

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See detailValidity of bench models in the learning of minimal invasive surgery
Blavier, Adelaïde ULg

Conference (2009, June)

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See detailPlanning flood risk reducing measures based on combined hydraulic and socio-economic impact modelling at a micro-scale
Ernst, Julien ULg; Coninx, Ingrid; Dewals, Benjamin ULg et al

in Christodoulou, S. E. (Ed.) Proc. 7th Int. Conf. on Water Resources Conservancy and Risk Reduction Under Climatic Uncertainty (2009, June)

Risk management is currently shifting from the full protection against flooding towards the management of the consequences of flooding. To reduce these consequences, micro-scale analysis is compelled. In ... [more ▼]

Risk management is currently shifting from the full protection against flooding towards the management of the consequences of flooding. To reduce these consequences, micro-scale analysis is compelled. In addition to the hydraulic modelling of the inundation flow, nearby land use and vulnerability of elements-at-risk are taken into consideration. This new approach requests an interdisciplinary collaboration of scientists from hydraulic and social science, as is the case for this paper. The research teams have developed a methodology to evaluate socio-economic consequences of flooding based on the analysis at the micro-scale of the flood characteristics, the exposure and the vulnerability of elements-at-risk and the adaptive capacity of society. The hydrodynamic simulations are conducted by means of 2D flow modelling run on a highly accurate Digital Surface Model - DSM with a resolution of 2 by 2 meters. The two-dimensional modelling provides high resolution flood maps detailing the distribution of water depth and flow velocity field in the floodplains, which constitute key inputs for the subsequent flood risk analysis. The methodology will be illustrated for a case study along River Ourthe, which is the main tributary of River Meuse in Belgium, for selecting and designing flood protection measure. The geographic data in this area are available at a resolution consistent with the conducted micro-scale risk analysis. They include data on social vulnerability coming from the most recent socio-economic national survey (NIS). [less ▲]

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See detailImpact of the presence of a clinical pharmacist in university hospital wards on the elderly or polymedicated patients care
Van Hees, Thierry ULg; Delporte, Jean-Pierre ULg; Petermans, Jean ULg

in Journal of Nutrition, Health & Aging (The) (2009, June), 13(Supplement 1), 465

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See detailAbnormal neural filtering of irrelevant information in depressed patients.
Desseilles, Martin ULg; Muselle, A.; Devue, Christel ULg et al

Poster (2009, June)

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