References of "Scientific congresses and symposiums"
     in
Bookmark and Share    
See detailA Bilevel Competitive Facility Location Model with Competitor’s Response
Kucukaydin, Hande ULiege; Aras, Necati; Altinel, I. Kuban

Conference (2010, July 11)

We are concerned with a problem in which a new entrant leader firm aims at finding the location and attractiveness of each new facility to maximize its profit where there are existing facilities belonging ... [more ▼]

We are concerned with a problem in which a new entrant leader firm aims at finding the location and attractiveness of each new facility to maximize its profit where there are existing facilities belonging to a competitor. The competitor reacts to the leader by adjusting the attractiveness levels of its existing facilities to maximize its profit. We first formulate a bilevel mixed-integer nonlinear programming model. Then, we convert it into an equivalent single level mixed-integer nonlinear program and solve it using global optimization methods. [less ▲]

Detailed reference viewed: 20 (1 ULiège)
See detailStudy of oxylipins pathways by a transcriptomic analysis of two variety of
Ghars, Mohamed Ali ULiege; Muhovski, Y.; Ghanem, M. et al

Poster (2010, July 11)

Detailed reference viewed: 31 (5 ULiège)
Peer Reviewed
See detailSynthesis and characterization of highly loaded Pt/carbon xerogel catalysts prepared by Strong Electrostatic Adsorption method
Job, Nathalie ULiege; Maillard, F.; Chatenet, M. et al

Conference (2010, July 11)

Detailed reference viewed: 17 (4 ULiège)
Peer Reviewed
See detailMolecular Elasticity of a Mechanically-Linked Polymer
Lussis, Perrine ULiege; Fustin, C.-A; Van Quaethem, A et al

Conference (2010, July 11)

Detailed reference viewed: 4 (0 ULiège)
Peer Reviewed
See detailImmobilization of homogenous catalysts in nanostructured carbon materials
Gheorghiu, C. C.; Pérez-Cadenas, M.; Roman-Martinez, M. C. et al

Poster (2010, July 11)

Detailed reference viewed: 9 (0 ULiège)
Peer Reviewed
See detailFunctionalization of carbon xerogels for the preparation of Pd/C catalysts by grafting of Pd complex
Diverchy, C.; Hermans, S.; Job, Nathalie ULiege et al

Poster (2010, July 11)

Detailed reference viewed: 12 (0 ULiège)
Full Text
Peer Reviewed
See detailLes Silphidae...de nouveaux bio-indicateurs en entomologie forensique?
Dekeirsschieter, Jessica ULiege; Verheggen, François ULiege; Haubruge, Eric ULiege

in VII Conférence Internationale Francophone d'Entomologie: Interactions et Biodiversité (2010, July 09)

Detailed reference viewed: 76 (11 ULiège)
Peer Reviewed
See detailEvaluer les compétences : la place du contexte.
Bertrand, Françoise ULiege; Tibax, V.; Hansez, Isabelle ULiege

Conference (2010, July 09)

Detailed reference viewed: 33 (2 ULiège)
Peer Reviewed
See detailAgrifutur : se former pour demain.
Babic, Audrey ULiege; Peters, Stéphanie ULiege; Côte, Virginie et al

Conference (2010, July 09)

Detailed reference viewed: 73 (7 ULiège)
Peer Reviewed
See detailUtilité des composés organiques volatils (COVs) émis par les Diptères nécrophages dans l’estimation de l’intervalle post mortem.
Frederickx, Christine ULiege; Dekeirsschieter, Jessica ULiege; Verheggen, François ULiege et al

Conference (2010, July 09)

L’entomologie forensique s’intéresse à l’étude des insectes et d’autres arthropodes permettant d’estimer la période écoulée entre le décès d’une victime et la découverte du corps, encore appelée ... [more ▼]

L’entomologie forensique s’intéresse à l’étude des insectes et d’autres arthropodes permettant d’estimer la période écoulée entre le décès d’une victime et la découverte du corps, encore appelée intervalle post mortem ou IPM. Actuellement, cet intervalle post mortem est estimé après élevage en laboratoire des œufs, des larves et des pupes des Diptères nécrophages prélevés sur la scène de crime. Afin d’éviter cette mise en élevage, il est possible d’estimer l’âge des pupes de Diptères. A cette fin, nous avons prélevé par microextraction sur phase solide (SPME) les composés organiques volatils émis par les pupes de Diptères tout au long de leur pupaison. Ces composés organiques volatiles sont ensuite analysés par chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC-MS). Ces analyses permettront d’une part d’estimer l’IPM plus justement et d’autre part de visualiser l’évolution des composés organiques volatiles émis par les pupes de Diptères nécrophages au cours de leur pupaison. [less ▲]

Detailed reference viewed: 59 (13 ULiège)
Peer Reviewed
See detailIdentification of ‘Textsorten’ in the Late Egyptian Corpus
Gohy, Stéphanie ULiege; Martin Leon, Benjamin ULiege

in Winand, Jean; Polis, Stéphane (Eds.) Texts, Languages & Information. Technology in Egyptology. Selected papers from the meeting of the Computer Working Group of the International Association of Egyptologists (Informatique & Égyptologie), Liège, 6-8 July 2010 (2010, July 08)

Detailed reference viewed: 15 (2 ULiège)
Full Text
Peer Reviewed
See detailIs there a generalized procedural deficit in children with Specific Language Impairment?
Gabriel, Audrey ULiege; Maillart, Christelle ULiege; Guillaume, Mélody et al

Poster (2010, July 08)

Previous studies (Lum et al., 2009; Tomblin et al., 2007; Ullman & Pierpont, 2005) have suggested that difficulties in the procedural learning system could contribute, in part, to the language ... [more ▼]

Previous studies (Lum et al., 2009; Tomblin et al., 2007; Ullman & Pierpont, 2005) have suggested that difficulties in the procedural learning system could contribute, in part, to the language difficulties observed in children with SLI. However, we have recently shown, with an adapted serial reaction time (SRT) task, that children with SLI are able to learn implicitly non-linguistic regularities (Gabriel et al., submitted). In this research, we wanted to determine whether children with SLI are able to learn an 8-elements probabilistic sequence into which irregularities are inserted. Assessing probabilistic sequence learning in children with SLI should help us to better circumscribe the language difficulties of these children [less ▲]

Detailed reference viewed: 215 (15 ULiège)
Full Text
See detailSurveillance de l'entomofaune des associations culturales prenant en compte le safoutier (Dacryodes edulis, (G. Don) H.J. Lam ; Burseraceae) dans le haut-Ogooué au Gabon
Poligui, René Noël ULiege

Conference (2010, July 08)

Malgré le nombre assez élevé d’études sur les insectes des cultures au niveau de l’Afrique centrale, il y a peu d’informations sur l’entomofaune des associations culturales intégrant le safoutier ... [more ▼]

Malgré le nombre assez élevé d’études sur les insectes des cultures au niveau de l’Afrique centrale, il y a peu d’informations sur l’entomofaune des associations culturales intégrant le safoutier (Dacryodes edulis, Burseraceae). Dans ce contexte, pendant seize semaines continues, nous avons effectué des observations diverses sur le terrain au niveau du Haut-Ogooué, au du Gabon. Les associations culturales des jardins des cases ont été caractérisées. Des insectes ont été évalués, respectivement 8611 individus pour 74 familles au moyen du contrôle visuel hebdomadaire sur le safoutier, 21753 individus pour 181 familles à partir des collectes hebdomadaires des pièges autour du safoutier, et 19196 individus pour 178 familles à partir des pièges des espaces témoins. Les résultats de ce travail révèlent que la diversité et les abondances de l’entomofaune de ce milieu évoluent en fonction des conditions climatiques, de la phénologie floricole du safoutier et de la nature de l’écosystème. Les pièges autour des safoutiers capturent plus d’insectes que ceux des espaces sans safoutiers. La diversité et les abondances sont plus importantes en milieu rural qu’en milieu urbain. Selon leur statut alimentaire, les insectes nuisibles sont les plus nombreux, viennent ensuite les insectes utiles et les insectes associés. Des espèces ayant une importance économique sur le safoutier ont été observées. Des observations ultérieures permettront de confirmer et de mieux cerner les ravageurs majeurs de ces associations, et de réaliser des investigations scientifiques sur les techniques de lutte biologique. [less ▲]

Detailed reference viewed: 40 (14 ULiège)
Full Text
See detailSustainable steel constructions – Life-cycle inventory, methods and applications
Rossi, Barbara ULiege

Conference (2010, July 07)

This document gives an overview of the challenges and issues related to a sustainable use of steel in the construction sector. After an introduction that concerns the challenges associated to the use of ... [more ▼]

This document gives an overview of the challenges and issues related to a sustainable use of steel in the construction sector. After an introduction that concerns the challenges associated to the use of steel as a sustainable material, the principles of a life-cycle analysis are presented. The paper then focuses on the life-cycle inventory data of several products: finished cold-rolled coil, electro-galvanized steel, section rolling and rebar. The data are presented for two (sometimes three) different recycling rates. Indeed, since steel is recycled to more than 85% at the end of its life and recyclable and indefinite number of times, the presented inventory includes allocation for scrap inputs and outputs using the closed material loop recycling methodology developed by the International Iron and Steel Institute (IISI). A description of the method principles is also provided. The influence of the end-of-life credit method will be discussed. Corrosion and subsequently maintenance of steel products will be treated afterwards and a brief comparison of the life-cycle inventory will be provided for electro-galvanized steel and finished steel. [less ▲]

Detailed reference viewed: 108 (7 ULiège)
Full Text
Peer Reviewed
See detailHegel et Levinas. Un difficile dialogue
Lejeune, Guillaume ULiege

Conference (2010, July 07)

Detailed reference viewed: 8 (0 ULiège)
Peer Reviewed
See detailThe Ramses Project: Review and Perspectives
Honnay, Anne-Claude ULiege; Polis, Stéphane ULiege; Winand, Jean ULiege

Conference (2010, July 07)

Detailed reference viewed: 65 (2 ULiège)
Full Text
See detailLife Cycle Assessment of Buildings - a review
Reiter, Sigrid ULiege

in Proceedings of ArcelorMittal International Network in Steel Construction 2010 : Sustainability Workshop (2010, July 07)

Detailed reference viewed: 80 (21 ULiège)
Full Text
Peer Reviewed
See detailUne intervention de formation examinée et développée à l’aide d’un cadre conceptuel issu du croisement des approches ergonomiques et psychosociologiques
Burlet, Géraldine; Faulx, Daniel ULiege

Conference (2010, July 06)

La contribution étudie les effets d’une intervention de formation fondée sur l’articulation des cadres conceptuels de la psychologie sociale et du socio-constructivisme, en l’occurrence un « dispositif ... [more ▼]

La contribution étudie les effets d’une intervention de formation fondée sur l’articulation des cadres conceptuels de la psychologie sociale et du socio-constructivisme, en l’occurrence un « dispositif d’immersion structuré » (DIS). L’analyse de l’impact de cette intervention, qui poursuit à la fois des objectifs cognitifs, identitaires et comportementaux, est fondée sur l’analyse thématique et structurale de contenu de 25 entretiens, et montre que le DIS a eu des effets conformes aux objectifs poursuivis par l’intervention, et cela aux trois niveaux : (1) des apprentissages sur les manières de fonctionner et de travailler d’autres services, (2) l’accroissement des comportements de coopération entre services, (3) le développement du sentiment d’appartenance organisationnelle. [less ▲]

Detailed reference viewed: 202 (12 ULiège)
Peer Reviewed
See detailImpact de la longueur des énoncés et de la fréquence lexicale sur la compréhension d’énoncés chez des enfants
Leclercq, Anne-Lise ULiege; Majerus, Steve ULiege; Maillart, Christelle ULiege

Conference (2010, July 06)

Introduction En psychologie cognitive, plusieurs modèles théoriques considèrent que le système de traitement de l’information humain a une capacité limitée (notamment, Just & Varma, 2007). L’efficacité ... [more ▼]

Introduction En psychologie cognitive, plusieurs modèles théoriques considèrent que le système de traitement de l’information humain a une capacité limitée (notamment, Just & Varma, 2007). L’efficacité lors d’activités recrutant un grand nombre de traitements cognitifs serait dépendante de la quantité de ressources disponibles pour les réaliser. En particulier, l’activité de compréhension d’énoncés nécessite la réalisation rapide et quasi simultanée d’un grand nombre de traitements, dont l’analyse morphosyntaxique à proprement parler, mais également le décodage phonologique et l’accès lexical. En outre, d’autres processus cognitifs interviennent, comme l’attention portée à la tâche ou la mémoire de travail qui permet la coordination entre le traitement de l’énoncé et le stockage des produits partiels de celui-ci. Selon le modèle de compréhension d’énoncés de Just & Carpenter (1992), les ressources disponibles doivent être réparties entre le stockage des éléments traités et l’analyse et l’intégration des éléments à traiter. Selon ces auteurs, certaines opérations sont plus coûteuses que d’autres. Par exemple, le traitement de lexèmes de basse fréquence lexicale serait plus coûteux que le traitement de lexèmes fréquents, car le niveau d’activation de base de leurs représentations lexicales serait inférieur à celui des derniers. De même, comme chaque élément à traiter consume des ressources, les ressources cognitives disponibles pour le traitement de chaque morphème sont proportionnellement moindres dans des énoncés longs que dans des énoncés courts. Ce nécessaire compromis lors du partage des ressources entre les opérations de stockage et de traitement peut donc se traduire par une chute des performances en compréhension d’énoncés, soit par oubli des premiers éléments traités, soit par manque de ressources pour traiter les derniers éléments présentés. Objectif Cette étude évalue l’impact de la longueur des énoncés et de la fréquence lexicale des lexèmes sur les performances en compréhension d’énoncés d’enfants de 4, 6, 8 et 10 ans. Méthodologie Participants : Enfants de 4, 6 et 8 ans (N=30 dans chaque groupe) et 15 enfants de 10 ans Tâche : Compréhension d’énoncés présentés oralement (structure = S + V transitif + COD + Proposition relative sujet avec verbe intransitif). Manipulation de la fréquence lexicale (4 niveaux) et de la longueur des énoncés par ajout d’éléments redondants (4 niveaux) Résultats Les effets de fréquence lexicale et de longueur se marquent en termes de réponses correctes de 4 à 6 ans, et en termes de rapidité de réponse de 6 à 10 ans. Conclusions La longueur des énoncés et la fréquence lexicale des termes utilisés sont des facteurs de complexité dans la compréhension d’énoncés, qui se manifestent par un échec de la compréhension chez les enfants les plus jeunes, et par un allongement du temps de traitement chez les enfants plus âgés. [less ▲]

Detailed reference viewed: 271 (19 ULiège)
Full Text
See detailTiO2 thin films (1 µm) with ordered porosity used as high performance photoelectrode in DSSC
Dewalque, Jennifer ULiege; Cloots, Rudi ULiege; Dubreuil, Olivier et al

Poster (2010, July 06)

Mesoporous anatase thin films are very promising materials to act as electrode in dye-sensitized solar cells. Randomly oriented nanocrystalline TiO2 particles are usually used to prepare photoelectrodes ... [more ▼]

Mesoporous anatase thin films are very promising materials to act as electrode in dye-sensitized solar cells. Randomly oriented nanocrystalline TiO2 particles are usually used to prepare photoelectrodes with a thickness of 10-15 µm. Templated-assisted dip-coating techniques are used to obtain thin films with ordered porosity. The use of different templates influences the film porosity in terms of long-range order, percentage of porosity, pore size and pores connectivity. The photovoltaic performances of the samples have been evaluated. Such mesostructured films are compared in terms of photovoltaic performance with TiO2 nanoparticles films, generally used in DSSC. [less ▲]

Detailed reference viewed: 49 (9 ULiège)
See detailRepeated thermal treatments applied to ordered TiO2 mesoporous thin film: Effect on the film crystallization and surface area
Henrist, Catherine ULiege; Dubreuil, Olivier; Krins, Natacha ULiege et al

Conference (2010, July 06)

Ordered, mesoporous films are prepared by template-assisted sol-gel techniques such as dip-coating from a precursors solution. However, monolayer films are only a few hundred nanometers thick and present ... [more ▼]

Ordered, mesoporous films are prepared by template-assisted sol-gel techniques such as dip-coating from a precursors solution. However, monolayer films are only a few hundred nanometers thick and present a limited surface area of active material resulting in poor photovoltaic performances. Therefore it is needed to increase the film thickness. A multilayer deposition process for anatase mesoporous film has been reported in the literature in 2005 by Zukalova and all. Unfortunately, later researches have shown a surface area limitation despite the increase of film thickness due to the repeated thermal treatments applied to the layers. In this study, we have investigated the microstructural evolution of a single mesoporous TiO2 layer submitted to repeated thermal treatments. The modifications are discussed in terms of film thickness, surface area, anatase crystals size and global crystallinity. Besides, we propose an alternative thermal treatment designed in an attempt to overcome the limitations induced by repeated calcinations. We have followed and compared the properties of mesoporous films submitted to both thermal treatments by X-ray diffraction (XRD), transmission electron microscopy (TEM) and environmental poroellipsometry (EEP). Those results show the importance of the tuning of thermal treatment when multilayers films are envisaged for DSSC applications. Indeed, this study quantifies the maximum perturbation encountered by the first layer during the preparation of a multilayer (up to 12) coating, which is submitted to a multistep calcination. Finally, the photovoltaic performances of assembled cells have been evaluated. [less ▲]

Detailed reference viewed: 29 (9 ULiège)
Full Text
Peer Reviewed
See detailLe manque de variabilité des schémas de construction comme facteur explicatif des difficultés morphosyntaxiques chez les enfants dysphasiques
Leroy, Sandrine ULiege; Moulin, Mélissa; Parisse, Christophe et al

Conference (2010, July 06)

Detailed reference viewed: 98 (7 ULiège)
Peer Reviewed
See detailCorps scéniques vs corps écraniques. Les spectacles de Beaubois et Kuypers
Tomasovic, Dick ULiege

Conference (2010, July 05)

Detailed reference viewed: 7 (0 ULiège)
Full Text
See detailDiversité des pucerons en parcelles de pomme de terre et impact sur la dissémination des viroses
Yattara, Almouner Ag Alhamis ULiege; Véronique Genin, Lionel Hartert; Francis, Frédéric ULiege

Poster (2010, July 05)

Protect crops against aphids is even less easy than the high proliferation potential and possible infestation by winged individuals from distant homes, require on the part of farmers regularly monitored ... [more ▼]

Protect crops against aphids is even less easy than the high proliferation potential and possible infestation by winged individuals from distant homes, require on the part of farmers regularly monitored. In addition, in the case of aphid vectors of virus diseases, it is necessary to detect the first attacks to limit the spread of the disease within the plot. In 2009, the abundance and diversity of aphids was studied using the yellow bins installed in a network of nine plots of potatoes throughout Wallonia. The evaluation of the diversity and abundance of aphid species were evaluated weekly by collecting the insects captured. At the same time catch and observations on the plots, a sample of thirty leaves of potato is taken from each of the nine plots and analyzed in the laboratory to detect any viral infections, mainly PVY and PLRV. During the growing season, six species of aphid were particularly abundant: Metopolophium dirhodum, Sitobion avenae, Aphis fabae, Macrosiphum euphorbiae, Rhopalosiphum padi and Acyrthosiphon pisum. The ELISA performed on leaf samples taken from different plots of potato revealed the presence of PVY and PLRV in six of nine plots sampled. We observed a greater diversity of aphid species in almost all plots investigated. [less ▲]

Detailed reference viewed: 59 (11 ULiège)
Peer Reviewed
See detailCounterparty Risk in Credit Default Swaps Markets
Sougné, Danielle ULiege; Mattar, Jamal ULiege

Conference (2010, July 04)

Detailed reference viewed: 16 (2 ULiège)
Full Text
Peer Reviewed
See detailEvaluation of a hydro-alcoholic solution as pre-surgical hand antisepsis in a veterinary setting.
Verwilghen, Denis ULiege; Mastrocicco, Emilie; Mainil, Jacques ULiege et al

Conference (2010, July 02)

Introduction: Despite the fact that presurgical antiseptic hand treatment of surgical staff has since become a worldwide accepted procedure, surgical site infection is still one of the most frequent types ... [more ▼]

Introduction: Despite the fact that presurgical antiseptic hand treatment of surgical staff has since become a worldwide accepted procedure, surgical site infection is still one of the most frequent types of nosocomial infections. Many products have been used for hand antisepsis, but the popularity of alcoholic rubs amongst human surgeons is increasing as they have shown to provide a rapid and immediate action, are considerably faster than disinfecting soap scrubs and cause less skin damage after repeated use. The purpose of this study was 1) to identify surgical hand antisepsis habits amongst veterinary surgery specialists in Europe (ECVS) and the United States (ACVS), 2) to compare povidone iodine and chlorhexidine gluconate scrubs with a hydro-alcoholic rub hand antisepsis protocol and 3) to evaluate the usefulness of a hydro-alcoholic rub solution in a veterinary surgical setting. Materials and Methods: Emails were sent to 1300 Diplomates to invite them to participate to an online survey in order to obtain an idea about pre-surgical hand disinfection techniques. In a preliminary trial the efficiency of 4% chlorhexidine gluconate, 7.5 % PVP-iodine and an alcoholic solution containing 45% 2-propanol, 30% 1-propanol, 0.2% mecetronium ethylsulphate (Sterillium®) in bacterial reduction on hands was compared. In a clinical trial, the suitability of Sterillium® was assessed in an equine and small animal set up during surgery procedures. Fingertips were pressed on blood agar plates and Gassner plates prior to hand antisepsis (PHA), after handantisepsis (AHA) and three hours after wearing sterile gloves (AG) in the preliminary trial or at the end of surgery (AS) in the clinical trial. Bacterial counts (colony forming units : CFU’s) were obtained after 24 h of incubation of the plates. The obtained values of CFU from PHA, AHA, AG and AS were expressed as log10 values. For each sample, a reduction factor (RF) was obtained from the difference of log10 pre-value and log10 post-value. An ANOVA comparison between the effects of the different antisepsis protocols on the mean log10 CFU values and RF’s in function of the different steps was established. Results: A 42.6% response rate was obtained for the survey. Most surgeons’ still use a disinfecting soap only (79.9%) for hand antisepsis prior to surgery, the majority based on chlorhexidine gluconate (81.4%). Significant differences were found between immediate and sustained activities of the different products tested. Sterillium® was shown to have significantly lower LSM log10 CFU at AG compared to both other products. At AHA, povidone iodine revealed to have significantly higher LSM log10 CFU than Sterillium® and chlorhexidine gluconate, with the last two products having comparable activities. Reduction factors for the Sterillium® were significantly greater than for the other products. Only RF1 was comparable between Sterillium® and chlorhexidine gluconate. In the clinical trial, no significant differences were found between surgeons regarding LSM log10 CFU after hand antisepsis, neither between RF from samples taken at the small animal versus the equine surgery theatre. Discussion: This study confirms that Sterillium® is more effective in reducing bacterial counts on hands prior to surgery in a veterinary setting as are chlorhexidine gluconate (CHX) and povidone iodine soap. Moreover, they provide better tolerance and compliance to surgical hygiene protocols. Despite this, veterinary surgeons from all over the world still prefer the use of CHX soap, which has far more disadvantages than commonly accepted. Apart from the better skin tolerance and the absence of known resitance to the product, the use of Sterillium® offers the advantage of a fast (1.5 minute) surgical handantisepsis. This study shows that, as previously reported for human medicine, Sterillium® can safely be used in a veterinary surgical setting. [less ▲]

Detailed reference viewed: 199 (6 ULiège)
Full Text
Peer Reviewed
See detailMisery loves company beauty contest dynamics in exchange rates expectations
Muller, Aline ULiege; Pancotto, Francesca

Conference (2010, July 02)

Detailed reference viewed: 8 (0 ULiège)
Full Text
Peer Reviewed
See detailRetrospective evaluation of 9 horses with surgical treatment of keratoma
Salciccia, Alexandra ULiege; Bouhmala, Nabil; Serteyn, Didier ULiege et al

Poster (2010, July 02)

Detailed reference viewed: 79 (6 ULiège)
See detailClotridial hydrogenases and the biohydrogen production
Calusinska, Magdalena ULiege; Hamilton, Christopher ULiege; Masset, Julien ULiege et al

Poster (2010, July 01)

Among the large variety of microorganisms capable of fermentative hydrogen production, strict anaerobes such as Clostridium spp. are one of the most widely studied. They produce hydrogen by butyric and ... [more ▼]

Among the large variety of microorganisms capable of fermentative hydrogen production, strict anaerobes such as Clostridium spp. are one of the most widely studied. They produce hydrogen by butyric and mixed-acid fermentations at optimal pH values ranging from 4.5 to 5.5. While fermentative conditions such as substrate type, pH, hydraulic and solid retention time, H2 partial pressure and the concentration of acids produced have been extensively studied and optimized, relatively little is known about the different forms of hydrogenases present in clostridia. Building on previous reports [1, 2] and by analyzing sequenced genomes, we found that [FeFe] hydrogenases are not a homogenous group of enzymes, but exist in multiple forms with different modular structures and are especially abundant in Clostridum spp. [3]. However, among the numerous studies performed on fermentative hydrogen production by Clostridium sp., only a few are specifically concerned with hydrogenases. Even there the authors focus on one type of [FeFe] hydrogenase, (CpI-like) without considering the existence of multiple forms of this enzyme within one species. Therefore, we focused our research on the better characterization of different forms of hydrogenases present in the genus Clostridium. Using newly designed degenerate primers, specific for clostridial hydrogenases, we amplified different hydrogenases from our species of interest. Further, by designing specific qPCR assays we have quantitatively targeted different hydrogenases. By analyzing differential gene expression, according to applied growth conditions, we believe to optimize the hydrogen production process in order to achieve better production rates. To conclude, we think that a a precise knowledge of hydrogen metabolism and hydrogenases is essential to optimization of the biohydrogen production process and should therefore be a goal for future research. [less ▲]

Detailed reference viewed: 20 (0 ULiège)
Full Text
See detailThe potential of rotating-baseline nulling interferometers operating within large single-telescope apertures
Serabyn, E.; Mennesson, B.; Martin, Stefan et al

in Danchi, W. C.; Delplancke, F.; Rajagopal, J. K. (Eds.) Optical and Infrared Interferometry II (2010, July 01)

The use of a rotating-baseline nulling interferometer for exoplanet detection was proposed several decades ago, but the technique has not yet been fully demonstrated in practice. Here we consider the ... [more ▼]

The use of a rotating-baseline nulling interferometer for exoplanet detection was proposed several decades ago, but the technique has not yet been fully demonstrated in practice. Here we consider the faint companion and exozodiacal disk detection capabilities of rotating-baseline nulling interferometers, such as are envisioned for space-based infrared nullers, but operating instead within the aperture of large single telescopes. In particular, a nulling interferometer on a large aperture corrected by a next-generation extreme adaptive optics system can provide deep interferometric contrasts, and also reach smaller angles (sub λ/D) than classical coronagraphs. Such rotating nullers also provide validation for an eventual space-based rotating-baseline nulling interferometer. As practical examples, we describe ongoing experiments with rotating nullers at Palomar and Keck, and consider briefly the case of the Thirty Meter Telescope. [less ▲]

Detailed reference viewed: 16 (2 ULiège)
Full Text
See detailFirst steps in the development of a piston sensor for large aperture space telescopes
Guerri, Géraldine ULiege; Roose, Stéphane ULiege; Stockman, Yvan ULiege et al

in Oschmann, J.; Clampin, M.; MacEwen, H. (Eds.) Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave (2010, July 01)

Nowadays spaceborne missions for astronomy or Earth imaging need high resolution observation which implies the development of large aperture telescopes. This can be achieved by multi-aperture telescopes ... [more ▼]

Nowadays spaceborne missions for astronomy or Earth imaging need high resolution observation which implies the development of large aperture telescopes. This can be achieved by multi-aperture telescopes or large segmented telescopes. One of the major issues is the phasing of the sub-apertures or the segments of such telescopes. A cophasing sensor is therefore mandatory to achieve the ultimate resolution of these telescopes. In this framework, Liège Space Center (CSL) concern is the development of a compact cophasing sensor to phase new large lightweight segmented mirrors for future space telescopes. The sensor concept has its origins in new phase retrieval algorithms which have been recently developed. In this paper, we outline the concept and the experimental validation results of our piston sensor breadboard which is currently under development in our laboratory. Finally, future prospects and further developments of our experiment are presented. [less ▲]

Detailed reference viewed: 59 (18 ULiège)
See detailHigh contrast stellar observations within the diffraction limit at the Palomar Hale telescope
Mennesson, B.; Hanot, Charles ULiege; Serabyn, E. et al

in McLean, I.; Ramsay, S.; Takami, H. (Eds.) Ground-based and Airborne Instrumentation for Astronomy III (2010, July 01)

We report on high-accuracy, high-resolution (< 20mas) stellar measurements obtained in the near infrared ( 2.2 microns) at the Palomar 200 inch telescope using two elliptical (3m x 1.5m) sub-apertures ... [more ▼]

We report on high-accuracy, high-resolution (< 20mas) stellar measurements obtained in the near infrared ( 2.2 microns) at the Palomar 200 inch telescope using two elliptical (3m x 1.5m) sub-apertures located 3.4m apart. Our interferometric coronagraph, known as the "Palomar Fiber Nuller" (PFN), is located downstream of the Palomar adaptive optics (AO) system and recombines the two separate beams into a common singlemode fiber. The AO system acts as a "fringe tracker", maintaining the optical path difference (OPD) between the beams around an adjustable value, which is set to the central dark interference fringe. AO correction ensures high efficiency and stable injection of the beams into the single-mode fiber. A chopper wheel and a fast photometer are used to record short (< 50ms per beam) interleaved sequences of background, individual beam and interferometric signals. In order to analyze these chopped null data sequences, we developed a new statistical method, baptized "Null Self-Calibration" (NSC), which provides astrophysical null measurements at the 0.001 level, with 1 σ uncertainties as low as 0.0003. Such accuracy translates into a dynamic range greater than 1000:1 within the diffraction limit, demonstrating that the approach effectively bridges the traditional gap between regular coronagraphs, limited in angular resolution, and long baseline visibility interferometers, whose dynamic range is restricted to 100:1. As our measurements are extremely sensitive to the brightness distribution very close to the optical axis, we were able to constrain the stellar diameters and amounts of circumstellar emission for a sample of very bright stars. With the improvement expected when the PALM-3000 extreme AO system comes on-line at Palomar, the same instrument now equipped with a state of the art low noise fast read-out near IR camera, will yield 10[SUP]-4[/SUP] to 10[SUP]-3[/SUP] contrast as close as 30 mas for stars with K magnitude brighter than 6. Such a system will provide a unique and ideal tool for the detection of young (<100 Myr) self-luminous planets and hot debris disks in the immediate vicinity (0.1 to a few AUs) of nearby (< 50pc) stars. [less ▲]

Detailed reference viewed: 20 (4 ULiège)
Full Text
See detailThe technical challenges of the Solar-Orbiter EUI instrument
Halain, Jean-Philippe ULiege; Rochus, Pierre ULiege; Appourchaux, Thierry et al

in Proceedings - Society of Photo-Optical Instrumentation Engineers (2010, July 01), 7732(26), 20

The Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter consists of a suite of two high-resolution imagers (HRI) and one dual-band full Sun imager (FSI) that will provide EUV and Lyman-α images of the ... [more ▼]

The Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter consists of a suite of two high-resolution imagers (HRI) and one dual-band full Sun imager (FSI) that will provide EUV and Lyman-α images of the solar atmospheric layers above the photosphere. The EUI instrument is based on a set of challenging new technologies allowing to reach the scientific objectives and to cope with the hard space environment of the Solar Orbiter mission. The mechanical concept of the EUI instrument is based on a common structure supporting the HRI and FSI channels, and a separated electronic box. A heat rejection baffle system is used to reduce the Sun heat load and provide a first protection level against the solar disk straylight. The spectral bands are selected by thin filters and multilayer mirror coatings. The detectors are 10μm pitch back illuminated CMOS Active Pixel Sensors (APS), best suited for the EUI science requirements and radiation hardness. This paper presents the EUI instrument concept and its major sub-systems. The current developments of the instrument technologies are also summarized. [less ▲]

Detailed reference viewed: 66 (18 ULiège)
See detailBiomimetic coatings with robust antibacterial properties
Jérôme, Christine ULiege; Cécius, Michaël; Faure, Emilie ULiege et al

Conference (2010, July 01)

Detailed reference viewed: 35 (6 ULiège)
Full Text
See detailDevelopment of a high-dynamic range imaging instrument for a single telescope by a pupil remapping system
Kotani, Takayuki; Lacour, Sylvestre; Choquet, Elodie et al

in Optical and Infrared Interferometry II (2010, July 01)

We present the laboratory demonstration of a very high-dynamic range imaging instrument FIRST (Fibered Imager foR Single Telescope). FIRST combines the techniques for aperture masking and a single-mode ... [more ▼]

We present the laboratory demonstration of a very high-dynamic range imaging instrument FIRST (Fibered Imager foR Single Telescope). FIRST combines the techniques for aperture masking and a single-mode fiber interferometer to correct wavefront errors, which leads to a very high-dynamic range up to 106 around very near the central object (~ λ/D) at visible to near-infrared wavelengths. Our laboratory experiments successfully demonstrated that the original image can be reconstructed through a pupil remapping system. A first on-sky test will be performed at the Lick Observatory 3- m Shane telescope for operational tests in the summer of 2010. [less ▲]

Detailed reference viewed: 9 (1 ULiège)
Full Text
See detailTechnofonctionalité des lipides alimentaires
Danthine, Sabine ULiege

Conference (2010, July 01)

Detailed reference viewed: 38 (7 ULiège)
Full Text
See detailAnnular groove phase mask coronagraph in diamond for mid-IR wavelengths: manufacturing assessment and performance analysis
Delacroix, Christian ULiege; Forsberg, P.; Karlsson, M. et al

in Oschmann, J.; Clampin, M.; MacEwen, H. (Eds.) Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave (2010, July 01)

Phase-mask coronagraphs are known to provide high contrast imaging capabilities while preserving a small inner working angle, which allows searching for exoplanets or circumstellar disks with smaller ... [more ▼]

Phase-mask coronagraphs are known to provide high contrast imaging capabilities while preserving a small inner working angle, which allows searching for exoplanets or circumstellar disks with smaller telescopes or at longer wavelengths. The AGPM (Annular Groove Phase Mask, Mawet et al. 2005[SUP]1[/SUP]) is an optical vectorial vortex coronagraph (or vector vortex) induced by a rotationally symmetric subwavelength grating (i.e. with a period smaller than λ/n, λ being the observed wavelength and n the refractive index of the grating substrate). In this paper, we present our first midinfrared AGPM prototypes imprinted on a diamond substrate. We firstly give an extrapolation of the expected coronagraph performances in the N-band (~10 μm), and prospects for down-scaling the technology to the most wanted L-band (~3.5 μm). We then present the manufacturing and measurement results, using diamond-optimized microfabrication techniques such as nano-imprint lithography (NIL) and reactive ion etching (RIE). Finally, the subwavelength grating profile metrology combines surface metrology (scanning electron microscopy, atomic force microscopy, white light interferometry) with diffractometry on an optical polarimetric bench and cross correlation with theoretical simulations using rigorous coupled wave analysis (RCWA). [less ▲]

Detailed reference viewed: 77 (26 ULiège)
Full Text
See detailThe Fomalhaut debris disk seen from every angle with interferometry
Absil, Olivier ULiege; Mennesson, B.; Le Bouquin, J.-B. et al

in Danchi, W. C.; Delplancke, F.; Rajagopal, J. K. (Eds.) Optical and Infrared Interferometry II (2010, July)

In this paper, we present the results of three different studies of the Fomalhaut debris disk with infrared interferometry. First, VLTI/AMBER measurements are used to determine the position angle of the ... [more ▼]

In this paper, we present the results of three different studies of the Fomalhaut debris disk with infrared interferometry. First, VLTI/AMBER measurements are used to determine the position angle of the slightly oblate rapidly rotating photosphere by means of differential phase measurements across the Br-gamma photospheric line. This measurement allows us to confirm that the debris disk is located in the equatorial plane of its host star. Second, we use VLTI/VINCI to search for resolved near-infrared emission around the stellar photosphere, which would correspond to the presence of large amounts of hot dust grains located between the sublimation radius and the habitable zone. Our observations reveal a small excess of 0.88%+/-0.12% in K band relative to the photospheric flux. Finally, we use the Keck Interferometer Nuller in order to derive additional constraints on the nature of the resolved infrared emission. Our observations suggest a marginal detection of a circumstellar excess at 10 μm, which we use together with the VINCI detection to model the circumstellar emission. Preliminary results from this modeling effort are discussed. [less ▲]

Detailed reference viewed: 12 (1 ULiège)
Full Text
Peer Reviewed
See detailPonctuation de la proposition dans les chartes originales écrites en français à Liège
Mazziotta, Nicolas ULiege

in Iliescu, Maria; Siller-Runggaldier, Heidi; Danler, Paul (Eds.) Actes du 25e Congrès International de Linguistique et de Philologie Romanes (Innsbruck, 3-8 septembre 2007) (2010, July)

Dans cette contribution, nous présentons une des découvertes que nous avons faites en étudiant la ponctuation des chartes écrites à Liège entre 1236 et 1291. Il s’agit de faire le résumé d’une méthode et ... [more ▼]

Dans cette contribution, nous présentons une des découvertes que nous avons faites en étudiant la ponctuation des chartes écrites à Liège entre 1236 et 1291. Il s’agit de faire le résumé d’une méthode et description de la ponctuation médiévale (dans ses relations avec la syntaxe, cf. Boutier 2001) et de montrer son intérêt. §1. Dans un premier temps, nous définissons empiriquement la proposition comme une structure syntaxique organisée autour d’un verbe assumant la fonction de prédicat. Nous sommes ensuite amené à distinguer les phrases (qui jouent le rôle d’énoncé complet) des subordonnées, puis à séparer ces dernières en deux groupes, suivant leur fonction syntaxique : propositions actancielles (actant ou circonstant) et non actancielles (p. ex., relative). §2. Nous examinons alors la fréquence de présence de ponctuation de part et d’autre des constructions (attestées dans notre corpus) que nous pouvons ranger dans l’un ou l’autre des groupes définis en 1. L’examen révèle une différence significative dans la fréquence de marquage des trois types de structures : les phrases sont les unités qui sont le plus souvent ponctuées, puis viennent les propositions actancielles, et celles de fonction non actancielle. §3. La gradation découverte au point 2 ne tient pas compte des propositions incidentes, qui ne sont pas introduites par un subordonnant, pourraient jouer le rôle d’un énoncé, mais sont manifestement enchâssées dans une structure plus large. Une nouvelle série de tests sur les fréquences de ponctuation permet de constater que ces propositions particulières occupent une position intermédiaire entre la phrase et les subordonnées de fonction actancielle. Les phénomènes observés inclinent à penser que l’analyse traditionnelle, qui découpe les textes anciens en phrases, correspond assez bien à la manière dont les scribes eux-mêmes les comprenaient. D’autre part, la ponctuation originale est un témoins précieux pour apprécier la conscience linguistique des praticiens. Au travers des « unités de lecture » (Marchello-Nizia 1978) qu’elle marque, la ponctuation permet d’entrevoir la langue. BOUTIER Marie-Guy (2001). « Études sur des chartes luxembourgeoises », dans Gärtner Kurt et al. (éd.) Skripta, Schreiblandschaften und Standardisierungstehenzen. Urkundensprachen im Grenzbereich von Germania und Romania im 13. und 14. Jahrhundert.Trier. – MARCHELLO- NIZIA Christiane (1978). « Ponctuation et “unités de lecture” dans les manuscrits médiévaux ou : je ponctue, tu lis, il théorise », dans Langue française 40. – MAZZIOTTA Nicolas, « Inconstance ou consensus ? Ponctuation et protase dans les chartes écrites en français à Liège avant 1271 », à paraître dans les Actes du XXIVe CILPR, Aberystwyth, 1er-6 août 2004. [less ▲]

Detailed reference viewed: 53 (5 ULiège)
Peer Reviewed
See detailDevelopment by sol-gel process of photocatalytic TiO2 thin films prepared by dip-coating
Malengreaux, Charline ULiege; Timmermans, Adrien; Heinrichs, Benoît ULiege

Poster (2010, July)

Detailed reference viewed: 97 (29 ULiège)
See detailAssociation des approches morphologique et moléculaire pour l’identification des vers à soies endémiques de Madagascar (Lasiocampidae, Borocera cajani)
Rakotondramanana, Alihasina; Nguyen, Bach Kim ULiege; Verheggen, François ULiege et al

Poster (2010, July)

La soie est une matière utilisée par les Malgaches depuis bien avant la colonisation. Cette soie est fabriquée à partir de la collecte de cocons des papillons du genre Borocera spp., ver à soie sauvage ... [more ▼]

La soie est une matière utilisée par les Malgaches depuis bien avant la colonisation. Cette soie est fabriquée à partir de la collecte de cocons des papillons du genre Borocera spp., ver à soie sauvage. On connaît une dizaine d’espèces de vers à soie sauvages endémiques à Madagascar. Ces lépidoptères polyphages se nourrissent surtout des feuilles de Uapaca bojeri et d’autres plantes telles que Dodonea madagascariensis et Psidium guyava. Les critères morphologiques se révèlent insuffisant pour identifier cette diversité d’espèces de vers à soie, surtout au niveau des stades immatures. Afin de pallier à cette incapacité d’identifier les espèces, des méthodes de marqueurs moléculaires, en particulier la RAPD (Random Amplified Polymorphic DNA) et iSSR (inter Simple Sequence Repeat), ont été appliquées. En plus de l’identification des espèces, une étude de la diversité et de la distribution des vers à soie suite à la collecte dans plusieurs forêts éloignées de plusieurs de kilomètres les unes des autres (Arivonimamo, Ambatofinandrahana, Antananarivo). Cette étude a été menée dans le cadre de la conservation de ces espèces de vers à soie endémiques en milieu. Afin d’augmenter durablement les populations de vers à soie endémiques dans les forêts de Uapaca, il est important de déterminer les espèces en présence et les capacités de dispersion de ces dernières. Les techniques d’identification moléculaires développées permettront d’orienter les stratégies de gestion des populations de Borocera et des méthodes de gestion de l’écosystème, appropriables par les gestionnaires et les communautés locales des la forêt à Uapaca bojeri. [less ▲]

Detailed reference viewed: 121 (22 ULiège)
Full Text
See detailFish farm impacts on meiofauna and the microbenthic loop in Posidonia oceanica meadows
Pete, Dorothée ULiege; Mannard, Jennifer ULiege; Velimirov, Branko et al

in Hendrik, Gheerardyn; Nara Bezerra, Tania; Cnudde, Clio (Eds.) et al Fourteenth International Meiofauna Conference, Aula Academia, Ghent, 11-16 July 2010. (2010, July)

For about ten years, fish farming has been expanding all over the world. Even if this way of producing fishes is presented as a solution against overfishing, its impact on the surrounding environment can ... [more ▼]

For about ten years, fish farming has been expanding all over the world. Even if this way of producing fishes is presented as a solution against overfishing, its impact on the surrounding environment can be important. For example, meadows of Posidonia oceanica, the endemic seagrass of the Mediterranean coastal zone, are fading close to those aquaculture, showing negative impacts on this hot spot of biodiversity. This seagrass is used as an indicator of perturbations, although it does not react quickly, mainly because of its low turnover rate (1,5 y-1). So, it is proposed here to use meiofauna and the microbenthic loop (organic matter, bacteria, microphytobenthos and meiofauna) of this ecosystem to detect earlier perturbations due to fish farms. Moreover, the exergy index, measuring the distance between an ecosystem and its optimum state (climax), is also calculated on the microbenthic loop in order to show its interrest in ecological studies. Study sites are both situated in the Gulf of Calvi (Corsica, France), in P. oceanica meadows, at a depth of 22 m. The studied fish farm is small (10 cages), situated offshore in front of Calvi and produces 40 tons of seabass (Dicentrarchus labrax) per year. The reference site is located in front of the research station STARESO (STation de REcherches Sous-marine et Oceanographiques). Sediment cores (diameter: 4,7 cm) were taken in November 2008 at both sites and sliced in four layers (0-1 cm, 1-2 cm, 2-5 cm and 5-10 cm), according to the expected abundance of meiofauna organisms. Biomass and abundance of every parts of the microbenthic loop were thus analysed. Results concerning abundance, biomass and diversity of meiofauna organisms are presented here and compared with the rest of the microbenthic loop. Values of biomasses are also integrated in the calculation of the exergy index. Finally, this study evaluate the interest of meiofauna and the microbenthic loop to detect perturbations due to an aquaculture. [less ▲]

Detailed reference viewed: 92 (12 ULiège)
Full Text
Peer Reviewed
See detailAssessment of stress level in horses during competition using salivary cortisol: preliminary studies
Peeters, Marie ULiege; Sulon, Joseph; Serteyn, Didier ULiege et al

in Journal of Veterinary Behavior : Clinical Applications and Research (2010, July), 5(4), 216

Detailed reference viewed: 180 (17 ULiège)
Full Text
Peer Reviewed
See detailDynamic Modeling and Validation of Radiant Ceiling Systems Coupled to its Environment
Fonseca, Néstor; Cuevas, Cristian; Lemort, Vincent ULiege

(2010, July)

This paper presents the results of a study performed in order to develop a dynamic model of radiant ceiling panels in heating or cooling modes coupled to its environment (fenestration, walls, internal ... [more ▼]

This paper presents the results of a study performed in order to develop a dynamic model of radiant ceiling panels in heating or cooling modes coupled to its environment (fenestration, walls, internal loads and ventilation system). The model considers the radiant panels as a dynamic-state finned heat exchanger connected to a detailed lumped dynamic model of the building (R-C network). The behavior of the radiant ceiling system and the interactions with its environment has been experimentally and numerically evaluated. Using as inputs the radiant ceiling and room dimensions, material properties and the transient measurements of air temperature at the adjacent zones, supply air and water temperatures and mass flow rates, the model allows for the estimation of the water exhaust temperature, radiant ceiling average surface temperature, resultant and dry air room temperatures, radiant ceiling power and internal surface temperatures of the room in order to compare with measurements taken during the commissioning process. Two dynamic tests in heating and cooling modes are used to validate the model. [less ▲]

Detailed reference viewed: 50 (7 ULiège)
Peer Reviewed
See detailSocial Attitudes and Landscape Capacity towards Wind energy Parks in the Belgian Countryside
Schmitz, Serge ULiege; Vanderheyden, Vincent ULiege; Vanden Broeck, Steven et al

in Amit-Cohen, Irit (Ed.) Sustainability in Transition and the Changing Faces of Rural Areas: Enviuronmental, Social, Cultural and Economic Dimensions (2010, July)

Due to the recent changes at the world scale like the increase in raw material prices and the awareness of the global warming, several countries experience development of renewable power production. These ... [more ▼]

Due to the recent changes at the world scale like the increase in raw material prices and the awareness of the global warming, several countries experience development of renewable power production. These renewable productions often need a lot of place and they are localized in the countryside. This is the come back of the energy production in the rural system after fifty years of concentration of the production in towns, in nuclear power stations, and in large hydropower units. The paper focuses on the wind energy parks development in Belgium countryside, a high-populated area in northwestern Europe. From the experiences in the neighbouring countries, it transpired that social (residents’ reactions) and environmental (landscape impact) aspects are worthy of attention. The paper presents the results of Lacsawep, a two-year federal research project (www.belspo.be/ssd/), that examines which landscapes are adapted to wind energy in Belgium and how Belgian citizens in different contexts perceive those projects. The attitude toward wind energy parks in Belgium is based on information coming from several levels: the mouth to ear, the municipality’s, communication and project leader’s communication, the regional, national, and international Medias. The citizens difficultly analyse the mishmash of pro- and contra- information. The discourses and the bases of attitudes toward wind energy parks are a complex of physical annoyances, economic arguments, symbolic arguments, and type of decision-making process. Last but not least, these attitudes may change quickly due to the international concerns and the upsurge of wind energy parks. In Belgium, it was noticed that during the research project, the attitude toward wind energy parks changed positively. [less ▲]

Detailed reference viewed: 69 (12 ULiège)
Full Text
Peer Reviewed
See detailExperimental Analysis of Radiant Ceiling Systems Coupled to its Environment
Fonseca, Néstor; Cuevas, Cristian; Lemort, Vincent ULiege

(2010, July)

This paper presents the results of an experimental analysis of the radiant ceiling systems in both heating and cooling modes coupled to its environment (fenestration, walls, internal loads and ventilation ... [more ▼]

This paper presents the results of an experimental analysis of the radiant ceiling systems in both heating and cooling modes coupled to its environment (fenestration, walls, internal loads and ventilation system). The main objective of this study is to present the results of the systems performance and measurement methods used to evaluate the influence of some important parameters on the radiant ceiling capacity and comfort conditions. Two test chambers are adapted in a way to reproduce as good as possible the characteristics of the real offices located in Brussels. Forty-six tests were performed in which the main objective was to observe the influence of parameters such as the mass flow rate, supply water temperature and thermal load distribution, fenestration and ventilation system effects. Laboratory test results show that the influence of surfaces temperatures inside the room, especially the facade, is considerable. Therefore, the system must be evaluated together with its designed environment and not as separate HVAC equipment. [less ▲]

Detailed reference viewed: 34 (4 ULiège)
See detailMapping of kisspeptin projections in the midbrain of the pro-oestrus rat
Desroziers, Elodie ULiege; Mikkelsen, Jens; Simmoneaux, Valérie et al

Poster (2010, July)

Detailed reference viewed: 11 (0 ULiège)
Full Text
Peer Reviewed
See detailImprovements and validation of mid-infrared predictions of milk fatty acid
Soyeurt, Hélène ULiege; McParland, Sinead; Donagh, Berry et al

Conference (2010, July)

The development of mid-infrared equations to predict the milk fatty acid (FA) content of milk allows prompt analysis of large numbers of samples. The first aim was to improve these predictions by ... [more ▼]

The development of mid-infrared equations to predict the milk fatty acid (FA) content of milk allows prompt analysis of large numbers of samples. The first aim was to improve these predictions by comparing 6 statistical approaches. The second one was to validate the new equations using an independent sample set. The calibration set contained 239 spectrally different Belgian milk samples collected for over 2 years from several cows and breeds. FA were quantified by gas chromatography (GC). Statistical approaches tested were 1) partial least squares regression (PLS), 2) PLS and first derivative, 3) PLS and repeatability file (RF), 4) PLS, first derivative and RF, 5) PLS, second derivative, and 6) PLS, second derivative and RF. This last file contained spectra obtained from the same samples using 5 spectrometers. Cross-validation (CV) used 20 groups from the calibration set. Methods were compared using the ratio of the standard deviation of GC values to the standard error of CV (RPD). An external validation permitted a second comparison and was done using 362 samples collected for one year from multiple breeds and cows in Belgium, Ireland, and Scotland. Different RPD values were obtained by the 6 methods. Generally the equations developed using method 4 gave better results suggesting the adaptation of the methodology to the studied FA. It confirms by the obtained validation coefficients of determination. Highest values were observed for the equations with the highest RPD values except for C18:0. The ability to predict FA using method 4 gave superior results to those shown in previous publications. [less ▲]

Detailed reference viewed: 78 (10 ULiège)
See detailVariabilité et évolution des phéromones du genre de papillons Bicyclus (Nymphalidae, Satyrinae), et implication dans sa diversification.
Bacquet, Paul; Brattström, O.; Brakefield, P. M. et al

in VII Conférence Internationale Francophone d'Entomologie (2010, July)

Detailed reference viewed: 42 (1 ULiège)
Peer Reviewed
See detailThe essential role of the plastidial glyceraldehyde- 3-phosphate dehydrogenase in viable pollen development in Arabidopsis
Muñoz-Bertomeu, Jesús; Cascales - Miñana, Borja ULiege; Anoman, Armand D. et al

Poster (2010, July)

Detailed reference viewed: 20 (0 ULiège)
Full Text
Peer Reviewed
See detailA MODEL FOR WHEAT YIELD PREDICTION BASED ON REAL-TIME MONITORING OF ENVIRONMENTAL FACTORS
Dumont, Benjamin ULiege; Lebeau, Frédéric ULiege; Vancutsem, Françoise ULiege et al

Poster (2010, July)

This paper presents the results of a one year preliminary study in which a real time monitoring system was used to feed the STICS soil crop model. As indicated by the statistical criteria (RMSE and model ... [more ▼]

This paper presents the results of a one year preliminary study in which a real time monitoring system was used to feed the STICS soil crop model. As indicated by the statistical criteria (RMSE and model efficiency), the optimization of some wheat crop parameters allows the model to predict the yields with good accuracy for different soil type and different nitrogen application rates. [less ▲]

Detailed reference viewed: 125 (25 ULiège)
See detailMultidimensional fluctuation, pseudo-guessing and carelessness IRT person parameters with polytomous item response models
Raîche, Gilles; Magis, David ULiege; Béland, Sébastien

Conference (2010, July)

Frequently, candidates at aptitude multiple choice test miss attention, motivation or preparation and show underachievement or overachievement. Similarly, at surveys respondents show frequently misfitting ... [more ▼]

Frequently, candidates at aptitude multiple choice test miss attention, motivation or preparation and show underachievement or overachievement. Similarly, at surveys respondents show frequently misfitting patterns of responses. Their result does not correspond any more to their true aptitude or attitude, an inappropriate response pattern being obtained. New multidimensional models specific to polytomous responses circumvent these situations and diminish considerably the associated person bias. Multidimensional polytomous item response models adding new person parameters to the trait of the candidate are proposed. In the spirit of previous Raiche’s dichotomous responses IRT propositions, like the discrimination and don’t know item parameters, these models offer fluctuation and don’t know person parameters. Estimation methods, results from simulation showing the efficacy of these models and recommendations for the design of testing situations will be presented. [less ▲]

Detailed reference viewed: 83 (5 ULiège)
See detailA role for PSA-NCAM-dependent neuron-glia interactions in the control of GnRH neuron activity
Franceschini, Isabelle; Desroziers, Elodie ULiege; Lomet, Didier et al

Poster (2010, July)

Detailed reference viewed: 5 (0 ULiège)
See detailPotential of balloon payloads for in flight validation of direct and nulling interferometry concepts
Demangeon, Olivier; Ollivier, Marc; Le Duigou, Jean-Michel et al

in Danchi, W. C.; Delplancke, F.; Rajagopal, J. K. (Eds.) Optical and Infrared Interferometry II (2010, July)

While the question of low cost / low science precursors is raised to validate the concepts of direct and nulling interferometry space missions, balloon payloads offer a real opportunity thanks to their ... [more ▼]

While the question of low cost / low science precursors is raised to validate the concepts of direct and nulling interferometry space missions, balloon payloads offer a real opportunity thanks to their relatively low cost and reduced development plan. Taking into account the flight capabilities of various balloon types, we propose in this paper, several concepts of payloads associated to their flight plan. We also discuss the pros and cons of each concepts in terms of technological and science demonstration power. [less ▲]

Detailed reference viewed: 17 (3 ULiège)
Full Text
See detailProjets de territoire: l'exposition
Dalimier, Isabelle ULiege

in La CPDT a dix ans, la Wallonie dans dix ans (2010, July)

The border towns, municipalities and regions were invited to exhibit their vision of the territory for the coming years. The article analyses the projects presented. The development strategies were ... [more ▼]

The border towns, municipalities and regions were invited to exhibit their vision of the territory for the coming years. The article analyses the projects presented. The development strategies were conveyed via the messages that the project carriers wanted to get across to the six hundred and fifty people present at the conference, specifically by producing posters for the occasion and by completing a form per project that was published in the exhibition’s catalogue. The projects were relativized through a reading grid that grouped them according to the level of territory considered (neighbouring region level, supra-communal level, conglomeration level, municipal level and on a local scale) in order to release their various dimensions as well as the territorial development issues that sustain them. Three issues were particularly highlighted by it: the volition to develop real interregional and transborder co-operation, the major role of the urban revitalisation projects and the innovative and transposable nature of the projects developed on a local scale. [less ▲]

Detailed reference viewed: 100 (11 ULiège)
See detailUsing Snijders’ approach to standardize some parametric person fit indexes with estimated ability levels: a simulation study
Béland, Sébastien; Magis, David ULiege; Raîche, Gilles

Conference (2010, July)

Several authors (Molenaar & Hoijtink, 1990; Meijer & Sijtsma, 2001) have shown that several person-fit statistics present some important limitations. One issue is that the distribution of some parametric ... [more ▼]

Several authors (Molenaar & Hoijtink, 1990; Meijer & Sijtsma, 2001) have shown that several person-fit statistics present some important limitations. One issue is that the distribution of some parametric person-fit statistics is unknown. Another important issue is that the distribution of person-fit indexes is most often derived under the true ability level. In this situation, replacing the true ability by some estimate can seriously affect the distribution of these indexes. Snijders (2001) proposed a method to correct the mean and the variance of many parametric person-fit statistics to be approximately standard normally distributed, and derived the corrected version of the lz index. The purpose of this paper is to apply this correction to other well-known parametric indexes, and to compare them with their classical versions. The simulation results indicate that the standardized indexes have empirical type I errors close to the nominal significance level, and that the corrected indexes outperform their classical versions in this regard. [less ▲]

Detailed reference viewed: 49 (0 ULiège)
Peer Reviewed
See detailComputerized video multitracking of several small translucent fishes (glass eels) at night with fluorescent elastomer tags
Delcourt, Johann ULiege; Bolliet, Valérie; Ylieff, Marc ULiege et al

Poster (2010, July)

European eels (Anguilla Anguilla), an endangered species with high economic value, exhibit very unusual features in their multistage catadromous life cycle at different life stages. The reproduction of ... [more ▼]

European eels (Anguilla Anguilla), an endangered species with high economic value, exhibit very unusual features in their multistage catadromous life cycle at different life stages. The reproduction of eel takes place in the Sargasso Sea. Leptocephalus larvae use ocean currents (mainly the Gulf Stream) to migrate to European coastal areas, and then metamorphose into glass eels probably as they reach the continental shelf. Glass eel then, enter estuaries to join the fresh waters network. Knowledge about glass eel biology and migration has mainly increased in the eighties, and it is now well established that the activity during the estuary migration depends mainly on tidal cycle, even if lunar and circadian rhythms and/or direct influence of light and tidal coefficient may interact. Different migratory tactics are suspected on the basis of recent laboratory experiments (Bolliet & Labonne, 2008; Bureau du Colombier et al., 2009), notably the existence of individuals swimming only with the current, others swimming with and against the current, and others presenting a weak degree of activity. The propensity to migrate and glass eels energy content would be linked and may result in different migratory behaviours possibly leading to estuarine settlement (Bureau du Colombier et al., 2007; 2009). Unfortunately, few are known about the glass eel swimming behaviours in estuaries, a crucial point to better understand their estuarine migration: such knowledge would help to characterize the migratory tactics and to better understand the link with energy status. The videotracking system [EthoVision Color-Pro 3.1 (Noldus Information Technology)] which allows to measure automatically the movements of individuals represents an interesting tool to progress in this questioning. Nowadays, video tracking to measure fish behaviours is relatively frequent, but is rather rare in the ecological studies. Moreover, tracking a transparent animal, under water current conditions is a real challenge, particularly at night. To detect the individuals, several eels are marked by a fluorescent VIE tag (Visible Implant Elastomer, Northwest Marine Technology Inc.). VIE do no affect growth, survival and behaviour of tagged glass eels. Initially developed to improve the identification of individual tags in mark-recapture studies of aquatic animals, VIE tags are used here for a new extreme application in ethometry: the study of behaviours of transparent animals in weaker luminosity and in the dark by automatic tracking technology. The individual identification is based on the fluorescent color (red, blue, yellow and green) emitted by the VIE tag injected in the muscle mass on the basis of dorsal fin. The detection of the four marks is excellent. It allows measuring the activity (notably path and speed) of each tagged individuals as a function of tidal and nycthemeral rhythms in the same chronotron (circular aquarium simulating the estuarine conditions) and spatial use at a wide time scale from second to week. Another advantage is the possibility of tracked animals to go out the analysed arena without error of identification when it appears again in the analysed zone. This multitracking method by fluorescent VIE tags could be applied to a large number of species (crustaceans, fish, holothurians, amphibians, …). References: Bolliet & Labonne, 2008 Journal of Experimental Marine Biology and Ecology 362, 125-130; Bureau du Colombier et al., 2007 Physiology & Behavior 92, 684-690 ; Bureau du Colombier et al., 2009 Journal of Fish Biology 74, 2002-2013. Acknowledgements: This work was financially supported by FNRS-FRS (National fund of Research, Belgium) (project n°2.4617.08, n°2.4569.06, n°2.4569.10F), by Hubert Curien Tournesol project and by an EGIDE Grant. We thank J-C. Aymes for its help in testing the video tracking software and system. We are also highly grateful to Jacques Rives for its help in settling and monitoring the experiments. [less ▲]

Detailed reference viewed: 146 (10 ULiège)
Full Text
See detailEvaluer et renforcer l’efficacité des formations professionnelles. Etude dans une entreprise du secteur non-marchand belge
Peters, Stéphanie ULiege; Liégeois, Arnaud; Faulx, Daniel ULiege

Conference (2010, July)

Avec la concurrence croissante, les entreprises misent sur la formation pour être efficientes. Une littérature abondante permet aujourd’hui d’évaluer l’impact des programmes de formation. Comment cette ... [more ▼]

Avec la concurrence croissante, les entreprises misent sur la formation pour être efficientes. Une littérature abondante permet aujourd’hui d’évaluer l’impact des programmes de formation. Comment cette littérature est-elle utilisée par les praticiens ? Quels en sont les enseignements pour chercheurs ? Une étude est menée dans une entreprise du secteur non-marchand belge. Nous en présentons les fondements théoriques et l’appareillage méthodologique. Les quatre niveaux de l’évaluation selon Kirkpatrick (1998) constituent une référence : les personnes formées sont-elles satisfaites, ont-elles appris, ont-elles transféré les acquis de formation en situation réelle et, in fine, quel est le résultat de cette formation pour l’organisation. Depuis une vingtaine d’années, de nombreuses études ont permis l’identification des variables influençant ces quatre niveaux, et plus singulièrement le transfert : les variables liées à l’apprenant, les variables liées au contexte et les variables liées au design pédagogique. Elles ont été combinées dans des modèles complexes, dont le « Flawed Four-Level Evaluation Model » de Holton (1996). C’est sur ce modèle que s’appuie cette étude. Une attention particulière est accordée au climat de transfert, défini comme « la perception qu’a l’employé des facteurs qui l’aident ou au contraire l’empêchent d’exploiter ce qu’il a appris en situation de travail » (Bennett & Lehman, 1999, p. 193). Afin de préciser davantage l’impact du climat de transfert sur le transfert lui-même, nous avons envisagé le rôle médiateur de variables organisationnelles comme le préconisent Carr, Schmidt, Ford, et DeShon (2003) : la satisfaction au travail et l’implication organisationnelle. Une enquête par questionnaires est en cours auprès du personnel suivant une formation entre mars et novembre 2010 (N=554). Deux temps de mesure sont prévus : (1) à l’issue de la formation (mesure de la satisfaction, de l’apprentissage et du climat de transfert), (2) un mois après la formation (mesure du transfert auto-rapporté, de la satisfaction au travail et de l’implication organisationnelle). Les données récoltées vont permettre d’envisager le transfert comme un véritable processus dynamique. Il s’agit là d’un apport majeur pour les recherches futures en matière d’évaluation, dans la mesure où la tendance de ces dernières années a été d’appréhender le transfert comme une variable fixe et statique. Pour les praticiens, cette étude fournira de nombreuses pistes d’interventions en vue de renforcer l’efficacité de leurs programmes de formation. [less ▲]

Detailed reference viewed: 326 (32 ULiège)
Full Text
See detailMassive binaries as seen with GAIA
Palate, Matthieu ULiege; Rauw, Grégor ULiege; Gosset, Eric ULiege et al

Poster (2010, July)

Detailed reference viewed: 14 (3 ULiège)
See detailUse of image appraisal tools and covariance matrix
Caterina, David ULiege; Beaujean, Jean ULiege; Nguyen, Frédéric ULiege

Conference (2010, July)

Detailed reference viewed: 51 (13 ULiège)
Full Text
Peer Reviewed
See detailKnee model using articular shape knowledge
Schwartz, Cédric ULiege; de Zee, Mark; Rasmussen, John et al

Conference (2010, July)

In motion capture, a standard procedure to obtain the bone motion is the use of skin markers. However, because of the relative motion of the skin and the bones, so-called soft tissue artefacts (STA), the ... [more ▼]

In motion capture, a standard procedure to obtain the bone motion is the use of skin markers. However, because of the relative motion of the skin and the bones, so-called soft tissue artefacts (STA), the recorded motion does not accurately describe the movement of the bones. To compute joint reaction forces and perhaps limit STA, most musculo-skeletal models use underlying joint models. The knee is usually modeled as a simple hinge joint. However such approaches do not lead to a better estimation of the real motion1. In this work the hinge joint is improved by taking into account the morphological features of the joint surfaces. [less ▲]

Detailed reference viewed: 38 (7 ULiège)
Peer Reviewed
See detailHigh-quality remeshing using harmonic maps
Geuzaine, Christophe ULiege; Marchandise, E.; Remacle, J.-F.

in Proceedings of the 5th Advanced Computational Electromagnetics workshop (2010, July)

Detailed reference viewed: 11 (1 ULiège)
Peer Reviewed
See detailContract renewal as an incentive device: An application to the French urban transport sector
Gautier, Axel ULiege

Conference (2010, July)

In the French urban public transport industry, operations are often delegated and periodically putted out forto tender. Thus, operators’ incentives to reduce costs come from both profit maximization ... [more ▼]

In the French urban public transport industry, operations are often delegated and periodically putted out forto tender. Thus, operators’ incentives to reduce costs come from both profit maximization during the current contract and from the perspective of contract renewal. We have constructed a dynamic incentive regulation model that captures these features and we show that both the level of cost-reducing effort and its repartition during the contracting period depend on the contract type (cost-plus, gross cost or net cost contract). We then estimated a cost frontier model for an eight-year panel of French bus companies (677 company-year observations) to test our predictions. [less ▲]

Detailed reference viewed: 21 (3 ULiège)
Full Text
Peer Reviewed
See detailHeterogeneity of residuals variances of milk fatty acids in dairy cattle
Arnould, Valérie ULiege; Soyeurt, Hélène ULiege; Vanderick, Sylvie ULiege et al

in Journal of Dairy Science (2010, July), 88(E-Suppl. 2), 744

Routine genetic evaluation for milk fatty acids is under development in the Walloon Region of Belgium. The objective of this study was to test the heterogeneity of residual variances and therefore ... [more ▼]

Routine genetic evaluation for milk fatty acids is under development in the Walloon Region of Belgium. The objective of this study was to test the heterogeneity of residual variances and therefore indirectly the potential need to adjust for this heterogeneity if it exists. The residuals were computed as the difference between the observed and the estimated values using a multi-trait random regression test-day model, similar to the Walloon routine model, used for first lactation only milk yield, quantities and percentages of protein (PROT) and fat (FAT), content of saturated fatty acids in milk (g/100g of milk, SAT) and, content of mono-unsaturated fatty acids in milk (g/100g of milk, MONO). Residuals were considered homogeneous inside strata defined, among others, by weeks of lactation, by days in milk and by calendar months of test date. About 6,687,000 records were available for milk yield and for FAT and PROT parameters. For SAT and for MONO, about 184,000 records were available in this database. Means of residuals were stable and close to zero for all traits. Variances were more variable for MONO and SAT than for milk yield, for example. Daily and weekly variances tended to decrease at the end of the lactation (50%). When the variances were computed by month of test date, some variations were observed and some periods of year were more marked. In conclusion, the observed residual variances were less stable for MONO and SAT. We can conclude that introduction for heterogeneous residual variance is more important for the new traits (MONO, SAT) than it was for the old, traditional ones. [less ▲]

Detailed reference viewed: 61 (17 ULiège)
Full Text
See detailUpdate on Scroll Compressor Chamber Geometry
Bell, Ian ULiege; Groll, Eckhard; Braun, James et al

in International Compressor Engineering Conference at Purdue (2010, July)

The geometry of the scroll compressor determines the efficiency of the scroll compressor and controls all elements of its operation. It is therefore critical to be able to accurately model the volumes of ... [more ▼]

The geometry of the scroll compressor determines the efficiency of the scroll compressor and controls all elements of its operation. It is therefore critical to be able to accurately model the volumes of the compressor over the course of a revolution. This paper proposes a novel quasi-analytic formulation of the suction, compression and discharge chambers based on a change of variables from involute angle to polar integration angle. This solution has been compared against a reference polygon solution, and for the suction chamber this solution agrees to within 0.02%. The solutions for the compression and discharge chamber volumes are analytic and incur a negligible penalty to overhead of a detailed compressor model. In addition, the general nature of the solution presented allows for multiple compression chambers and more complex discharge geometry. [less ▲]

Detailed reference viewed: 14 (2 ULiège)
Peer Reviewed
See detailActivated-carbon-xerogel/TiO2-P25 composite photocatalysts with high activity for the degradation of p-nitrophenol
Páez Martínez, Carlos ULiege; Contreras, María; Olivera-Fuentes, Claudio et al

Poster (2010, July)

Detailed reference viewed: 92 (12 ULiège)
See detailEl efecto pigmalión o la teoría de la profecía autocumplida
Muñoz-Navarro, R.; Cascales - Miñana, Borja ULiege

Conference (2010, July)

Detailed reference viewed: 140 (0 ULiège)
Peer Reviewed
See detailAn in-situ NMR analysis of the formation of P- and SiO2-doped TiO2 xerogels
Bodson, Céline ULiege; Lambert, Stéphanie ULiege; Cattoën, Xavier et al

Poster (2010, July)

Detailed reference viewed: 19 (8 ULiège)
Full Text
See detailPIONIER: a visitor instrument for VLTI
Berger, Jean-Philippe; Zins, G.; Lazareff, B. et al

in Danchi, W. C.; Delplancke, F.; Rajagopal, J. K. (Eds.) Optical and Infrared Interferometry II (2010, July)

PIONIER is a 4-telescope visitor instrument for the VLTI, planned to see its first fringes in 2010. It combines four ATs or four UTs using a pairwise ABCD integrated optics combiner that can also be used ... [more ▼]

PIONIER is a 4-telescope visitor instrument for the VLTI, planned to see its first fringes in 2010. It combines four ATs or four UTs using a pairwise ABCD integrated optics combiner that can also be used in scanning mode. It provides low spectral resolution in H and K band. PIONIER is designed for imaging with a specific emphasis on fast fringe recording to allow closure-phases and visibilities to be precisely measured. In this work we provide the detailed description of the instrument and present its updated status. [less ▲]

Detailed reference viewed: 48 (2 ULiège)
Full Text
Peer Reviewed
See detailDonation after Cardiac Death In Liver Transplantation :is donor age an issue?
Detry, Olivier ULiege; De Roover, Arnaud ULiege; Squifflet, Jean-Paul ULiege et al

in Transplant International (2010, July), 23(Suppl. 1), 415

Detailed reference viewed: 43 (17 ULiège)
See detailRegulation of GnRH-1 neurons by glial cells: an in vitro study
Desroziers, Elodie ULiege; Kolasa, Elise; Franceschini, Isabelle et al

Poster (2010, July)

Detailed reference viewed: 4 (0 ULiège)
Full Text
Peer Reviewed
See detailDoes echocardiographic stress test induced release of hsTnT and TnI II?
Le Goff, Caroline ULiege; Laurent, Terry; Garweg, Christophe ULiege et al

in Clinical Chemistry (2010, July), 56(S6), 128

Background: Cardiac troponins (cTn) are considered as the best biomarkers for detection of myocardial cell injury. In this study, cTnT and cTnI were measured by new commercially available high-sensitive ... [more ▼]

Background: Cardiac troponins (cTn) are considered as the best biomarkers for detection of myocardial cell injury. In this study, cTnT and cTnI were measured by new commercially available high-sensitive methods in patients undergoing brief exercise- or pharmacologicinduced stress. Our aim was to compare cTnT and cTnI levels before and after the stress tests, in the patients with or without reversible ischemia. Materials and Methods: Fifty patients (28 men and 22 women) underwent an echographic stress test (ST) for suspected ischemic heart disease. Of these 50 patients, 28 received pharmacological ST (dobutamine injection) and 22 dynamic ST (bicycle exercise). The patients were subdivided into two groups according to the presence or absence of documented transient reversible ischemia: 14 with reversible ischemia ( mean age: 67.71±9.66 y) and 36 without ischemia ( mean age: 63.17±11.72 y). In all patients, cTnT and cTnI concentrations were measured by high sensitive methods (hsTnT, Roche Diagnostics and TnI II, Abbott Diagnostics) on heparin plasma immediately before (T0) and after ST (T1).The lower detection limit of these assays was 0.005μg/L for hsTnT and 0.01μg/L for TnI II. The protocol was approved by the ethics committee of the University of Liège (Belgium). All patients gave informed consent. All statistical analyses were performed using Medcalc version 8.1 for Windows. P value <0.05 was regarded as statistically significant. Results: There was no significant difference between hsTnT concentrations at T0 and T1, neither in the whole patient group, nor in the subgroups of subjects who received pharmacological ST or dynamic ST. The same was true for TnI II. Although there was no change in hsTnT levels during test in ischemic and in non ischemic patients, the latter tend to demonstrate higher median T0 levels (25th, 75th percentiles) than the others [0.011 (0.007, 0.029) vs 0.007 (0.0047, 0.1125) ng/ml, p=0.09]. They also showed higher median T1 levels [0.014 (0.065, 0.03) vs 0.007 (0.003, 0.0102) ng/ml, p=0.08]. Higher TnI II levels were also recorded in ischemic patients as compared to non ischemic patients at T0[ 0.014 (0.0072; 0.0265) vs 0.005 (0.003; 0.01) ng/ml, p=0.08] and T1[ 0.013 (0.0085- 0.03) vs 0.006 (0.0035-0.008) ng/ml, p=0.08]. Also, TnI II levels did not change during test in both subgroups. Conclusions: Measurement of cardiac troponins by high sensitive methods did not allow to detect significant release of biomarkers from the heart during exercise-or pharmacologic-induced ST, even in patients who demonstrated reversible myocardial ischemia. The type of test – pharmacological or dynamic - was without effect. The patients with induced transient ischemia had however higher troponin T and I levels at baseline, this difference remaining during test. [less ▲]

Detailed reference viewed: 96 (9 ULiège)
See detailKisspeptin immunoreactivity during post-natal development in rat.
Desroziers, Elodie ULiege; Mikkelsen, Jens; Caraty, Alain et al

Poster (2010, July)

Detailed reference viewed: 1 (0 ULiège)
Full Text
Peer Reviewed
See detailNew use of VEGF in therapeutics: application in tendon lesions
Kaux, Jean-François ULiege; Le Goff, Caroline ULiege; Drion, Pierre ULiege et al

in Clinical Chemistry (2010, July), 56(S6), 111

Introduction: As demonstrated in previous studies, mechanical overload, injury and inflammation, hypoxic condition or any combination of the above could lead to increased expression of VEGF in the tendon ... [more ▼]

Introduction: As demonstrated in previous studies, mechanical overload, injury and inflammation, hypoxic condition or any combination of the above could lead to increased expression of VEGF in the tendon. Thus, VEGF could participate in the healing of pathological tendons. Indeed, some authors are convinced that this neovascularization is the sign of a chronic tendinopathy while others plead in favour of it being a sign of healing processes. The VEGF111, which is a biologically active and proteolysis-resistant VEGF-A isoform, was recently identified. It is induced by ultraviolet B and genotoxic drugs. Experimentation shows that, in nude mice, tumors formed by HEK293 cells expressing VEGF111 develop a more widespread peritumoral neovascularisation than those expressing other VEGF isoforms. Good angiogenic activity and resistance to proteolysis makes VEGF111 a potential beneficial therapeutic option for ischemic diseases. The aim of our study was to determine whether if VEGF111 could have a therapeutic interest in the framework of tendinous pathology. Methods (*): A 5mm defect was surgically induced in Achilles tendon of 60 rats. Rats were divided into 2 groups of 30: A: a control group (no injection) and B: with a VEGF111 injection. The rats of group B received an injection of 100 ng of VEGF111 in situ 1 hour after surgery on the site of the tendon lesion. Afterwards, rats of both groups were placed in their cages without immobilization. After 5, 15 and 30 days, 10 rats of each group were euthanized. The traumatized Achilles tendon of each rat was dissected and removed. Immediately after sampling, tendons were submitted to a biomechanical tensile test up to rupture, using a tensile machine with “Cryo-jaw”. Statistical analyses were made with an ANOVA. Results: A significant increase over time of the force necessary to induce tendon rupture was observed for tendons which had been submitted to an injection of VEGF111 (p=0.016). The force required to break the tendon is always greater for the VEGF111 group (p<0.05). Discussion: We demonstrated that the force necessary to induce the rupture of a rat’s Achilles tendon during biomechanical tensile testing was greater for tendons which had been submitted to an injection of VEGF111. Thus, this experimentation showed that VEGF111 injections could accelerate the tendon healing process and increase the force needed to break tendons in their healing process. Conclusion: VEGF111 could be a new therapy for tendon lesions. However, other experimentation using a rat model with different concentrations of VEGF111 should be made to ascertain the best concentration for this healing process. Acknowledgement: This experimentation was partially financed by “Standard de Liège” and “Lejeune-Lechien” grants. (*) All experimental procedures and protocols used in this investigation were reviewed and approved by the Institutional Animal Care and Use Committee of the University of Liège. [less ▲]

Detailed reference viewed: 85 (21 ULiège)
Full Text
Peer Reviewed
See detailGenomic expression evaluation: introduction and perspectives
Ramery, Eve ULiege; Bureau, Fabrice ULiege; Guyot, Hugues ULiege et al

Conference (2010, July)

In a way, disease could be considered as the result of gene expression deregulation. Knowing what genes are expressed in a particular cell or tissue and how they are regulated allow to better understand ... [more ▼]

In a way, disease could be considered as the result of gene expression deregulation. Knowing what genes are expressed in a particular cell or tissue and how they are regulated allow to better understand disease mechanisms. Transcriptomic is the study of the expression of the entire genome. This technical challenge has been rendered possible as different species’ genomes began to be sequenced. Several techniques have rendered efficient this process of measuring simultaneously the expression level of a large number of genes. To date, micro-array technology is probably the best known. However, with the development of more affordable techniques, sequencing/ resequencing could compete with microarrays in the future. All together, these techniques open new ways for early diagnosis and prognosis for the practioner ‘in the field’. [less ▲]

Detailed reference viewed: 53 (9 ULiège)
Full Text
See detailThe planar optics phase sensor: a study for the VLTI 2nd generation fringe tracker
Blind, Nicolas; Le Bouquin, Jean-Baptiste; Absil, Olivier ULiege et al

in Danchi, W. C.; Delplancke, F.; Rajagopal, J. K. (Eds.) Optical and Infrared Interferometry II (2010, July)

In a few years, the second generation instruments of the Very Large Telescope Interferometer (VLTI) will routinely provide observations with 4 to 6 telescopes simultaneously. To reach their ultimate ... [more ▼]

In a few years, the second generation instruments of the Very Large Telescope Interferometer (VLTI) will routinely provide observations with 4 to 6 telescopes simultaneously. To reach their ultimate performance, they will need a fringe sensor capable to measure in real time the randomly varying optical paths differences. A collaboration between LAOG (PI institute), IAGL, OCA and GIPSA-Lab has proposed the Planar Optics Phase Sensor concept to ESO for the 2[SUP]nd[/SUP] Generation Fringe Tracker. This concept is based on the integrated optics technologies, enabling the conception of extremely compact interferometric instruments naturally providing single-mode spatial filtering. It allows operations with 4 and 6 telescopes by measuring the fringes position thanks to a spectrally dispersed ABCD method. We present here the main analysis which led to the current concept as well as the expected on-sky performance and the proposed design. [less ▲]

Detailed reference viewed: 48 (12 ULiège)
Full Text
See detail3D-reconstruction and overall topology of the dimeric mitochondrial ATP synthase of the colorless alga Polytomella sp
González-Halphen, Diego; Vázquez-Acevedo, Myriam; Cano-Estrada, Araceli et al

in Biochimica et Biophysica Acta (BBA) - Bioenergetics (2010, July), 1797(Supplement 1), 32

Detailed reference viewed: 43 (8 ULiège)
Full Text
See detailContinuous Roll Forming Simulation Using Arbitrary Lagrangian Eulerian Formalism
Boman, Romain ULiege; Ponthot, Jean-Philippe ULiege

in Khalili, Nasser; Valliappan, Somasundaram; Li, Qing (Eds.) et al Proceedings of the joint 9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics (2010, July)

Detailed reference viewed: 47 (18 ULiège)