References of "Poster"
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See detailImplication of tilted peptides in viral fusion
Lins, Laurence ULg; Brasseur, Robert ULg

Poster (2008, August)

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See detailSmall scale variations in the microbenthic loop of Posidonia oceanica meadows: an experimental interpolation design.
Pete, Dorothée ULg; Lenartz, Fabian ULg; Velimirov, Branko et al

Poster (2008, August)

In the sediment compartment of Posidonia oceanica meadows, there is a severe lack of information on small scale variations. In an attempt to understand spatial variations of the microbenthic loop ... [more ▼]

In the sediment compartment of Posidonia oceanica meadows, there is a severe lack of information on small scale variations. In an attempt to understand spatial variations of the microbenthic loop (bacteria, organic matter, microphytobenthos and meiofauna), an experiment based on interpolation methods was led in Calvi Bay (Corsica, France), in March 2008, at 10 m depth. Twelve points were sampled randomly in a 125 x 125 cm square, divided into twenty-five 25 x 25 cm squares, to assess and describe the spatial distribution and variations of different parameters of the sediment. Those parameters are granulometry, density of P. oceanica, concentration in nutrients in the pore water, bacteria (biomass, abundance, morphotypes), organic matter (biomass), microphytobenthos (biomass), roots and rhizomes (biomass) and meiofauna (biomass). Results and distribution maps of the respective sediment parameters will be presented for the first time. [less ▲]

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See detailEvaluation de l’impact des propriétés tensioactives et d’hydrophobicité de surface sur le transfert gaz-liquide au sein d’un réacteur biphasique et son extrapolation
Gillet, Sébastien ULg

Poster (2008, August)

L’objectif du travail était d’une part d’évaluer la faisabilité d’une extrapolation du système et d’autre part de mieux comprendre l’impact des constituants de ce système biphasique sur le transfert de ... [more ▼]

L’objectif du travail était d’une part d’évaluer la faisabilité d’une extrapolation du système et d’autre part de mieux comprendre l’impact des constituants de ce système biphasique sur le transfert de masse gaz-liquide.En proposant une méthode d’estimation en continu de la stabilité de l’émulsion biphasique, ce travail permet de conclure à la possibilité d’un passage à une échelle plus grande.Pour mieux comprendre l’impact de la biomasse et du surfactant sur les mécanismes impliqués dans le transfert, une approche basée sur trois types de mesures est proposée. Cette approche, simple dans sa mise en oeuvre, présente l’avantage de se baser sur des mesures réelles, permettant de prendre en compte certains facteurs ignorés par les modèles mathématiques fournis dans la littérature. Le travail met en évidence une diminution du “ kLa ” au cours de la “ vie ” d’un réacteur biphasique. De plus, les mécanismes responsables de cette diminution ont également pu être identifiés. [less ▲]

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See detailImpact of different spectroscopic datasets on CH4 retrievals from Jungfraujoch FTIR spectra
Duchatelet, Pierre ULg; Mahieu, Emmanuel ULg; Demoulin, Philippe ULg et al

Poster (2008, August)

Methane (CH4) is released in the atmosphere by natural processes (e.g. wetlands, termites) as well as by anthropogenic activities (e.g. fossil fuel exploitation, rice agriculture, biomass burning, etc ... [more ▼]

Methane (CH4) is released in the atmosphere by natural processes (e.g. wetlands, termites) as well as by anthropogenic activities (e.g. fossil fuel exploitation, rice agriculture, biomass burning, etc). Due to its high warming potential and its relatively long chemical lifetime (~9 years), atmospheric methane plays a major role in the radiative forcing responsible of the greenhouse effect. Methane also affects climate by influencing tropospheric ozone and stratospheric water. The cycle of methane is complex and to understand it requires a complete study of its emissions and its budget of sources and sinks. High quality methane data sets are needed to perform such studies. CH4 vertical distributions as well as total and partial column time series can be retrieved from high-resolution ground-based FTIR spectra, using, e.g., the SFIT-2 algorithm which implements the Optimal Estimation Method of Rodgers. A set of 5 microwindows - located in the 2 to 5.5 µm range and jointly adopted by all partners involved in the European HYMN project (www.knmi.nl/samenw/hymn/) - are fitted simultaneously during the retrieval procedure. Although this approach provides relatively high information content, CH4 retrieved profiles very often present large oscillations in the troposphere, which might result partly from inappropriate or inconsistent spectroscopic parameters. Significant improvements on retrieval quality could be reached by using more accurate CH4 spectroscopic parameters. This contribution compares 3 different sets of CH4 spectroscopic parameters (including HITRAN 2004 and 2 versions where HITRAN 2004 have been updated by recent laboratory measurements), which have been tested using one year of high resolution FTIR solar observations performed at the International Scientific Station of the Jungfraujoch (Swiss Alps, 46.5°N, 8.0 °E, 3580m a.s.l.). The impact of these different spectroscopic datasets on retrieved CH4 partial columns and vertical profiles, as well as on the fitting quality (residuals) and on the error budget characterizing our CH4 products will be evaluated and discussed. [less ▲]

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See detail3D finite‐element modeling for the magnetization of bulk high‐Tc drilled superconductors
Lousberg, Grégory ULg

Poster (2008, August)

Article associé : Numerical simulation of the magnetization of high-temperature superconductors: a 3D finite element method using a single time-step iteration

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See detailDry heathlands and sandy open grasslands in a suburban environment in the south of Brussels (Belgium) : Assessment of the conservation status
Taymans, Julien ULg; Mahy, Grégory ULg

Poster (2008, August)

The Brabant sablo-limoneux region is located in the south and near Brussels, in the phytogeographic district of Brabant (Atlantic domain). This region is characterized by a high diversity of local ... [more ▼]

The Brabant sablo-limoneux region is located in the south and near Brussels, in the phytogeographic district of Brabant (Atlantic domain). This region is characterized by a high diversity of local ecological conditions due to the alternance of important tertiary sand outcrops and quaternary silty layers. The agro-sylvo-pastoral activities, which were practiced on these sandy and sand-silty soils for centuries, caused the evolution of the climactic forest into semi-natural habitats such as dry heathland, sandy grassland and grassheath. The evolution of the heathland distribution from 1770 to the present has been studied on the scale of the Dyle hydrographic subbasin (43.000 ha). It is characterized by an important regression of this habitat in the study area (from 1460 ha in 1770 to 72 ha in 2006), mainly due to Pinus sylvestris orchards, and more recently, to urbanisation caused by the proximity of Brussels. A generalized ageing and an environmental closing characterize the evolution of heathland physiognomy since the middle of the 20th century. The phytosociology of heathlands, sandy grasslands and grassheaths has been characterized and 19 groups of vegetation have been differentiated. Among the 393 listed higher plant species, more than 30 are of great conservation interest in the regional context. A hierarchisation of restoration priorities has been established on the scale of the studied hydrographic subbasin and management measures have been proposed. [less ▲]

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See detailDifferential isotopic turnover (C and N) detected in Antarctic scavenger amphipods
Nyssen, Fabienne ULg; Michel, Loïc ULg; Dauby, Patrick ULg et al

Poster (2008, August)

Metabolic activity is positively related to temperature, inversely to body mass and is a function of taxon specific life style features, in particular activity such as level of active movement. Therefore ... [more ▼]

Metabolic activity is positively related to temperature, inversely to body mass and is a function of taxon specific life style features, in particular activity such as level of active movement. Therefore, the isotope signal transfer velocity is expected to be lower in cold environments and in larger as well as less active organisms. Our study explores whether this may be a problem in trophic studies of a comparatively “slow” because cold system such as the high Antarctic shelf ecosystem and in comparatively large organisms such as benthic amphipod species within this system. We compare experimentally the velocity of stable isotope signal transfer from prey to consumer in three lysianassoid amphipods, Waldeckia obesa, Abyssorchomene plebs and Pseudorchomene coatsi. They have similar alimentation, but different size and lifestyle. Indeed, W. obesa is a very sedentary species spending most of the time immobilized on diverse substrates whereas P. coatsi is very motile, swimming rapidly around the aquarium. The third species, A. plebs has an intermediate behaviour, sharing time between short swim and resting on bottom. Those species also differ significantly in size: and are good representative of scavenger trophic guild on Antarctic shelf. After being starved, amphipods were kept by species and fed ad libitum with lyophilized fish during fifty days. Individuals were sacrificed weekly for isotopic analysis. At the end of the 7-week incubation with standardized food, rank correlation of δ13C and δ15N against time did not show any consistent trend for A. plebs (δ13C: p = 0.51 and δ15N p = 0.04) neither for the species W. obesa (δ13C: p = 0.77 and δ15N p = 0.26). By contrast, for P. coatsi, rank correlations were highly significant (p < 0.0001). The linear regression illustrated a clear increase of isotopic ratios all along the experiment. This metabolic discrepancy between species is probably a size-mass effect. Furthermore, for this species, ANCOVA of the individually measured isotopic ratios first transformed to an offset value (rate vs carbon ↔ nitrogen, covariate time) provided evidence for significant effects of the parameter “isotope” on isotopic temporal evolution. Indeed, the δ13C values evolve much faster than the δ15N ones. According to data, it would take double time for P. coatsi to balance its nitrogen isotopic signature than its carbon isotopic ratio when changing food. Those results are critically discussed. [less ▲]

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See detailA mathematical modelling of bloom of the coccolithophore Emiliania huxleyi in a mesocosm experiment
Joassin, Pascal ULg; Delille, Bruno ULg; Soetaert, Karline et al

Poster (2008, July 23)

A dynamic model has been developed to represent biogeochemical variables and processes observed during a bloom of Emiliania huxleyi coccolithophore. This bloom was induced in a mesocosm experiment during ... [more ▼]

A dynamic model has been developed to represent biogeochemical variables and processes observed during a bloom of Emiliania huxleyi coccolithophore. This bloom was induced in a mesocosm experiment during which the ecosystem development was followed over a period of 23-days through changes in various biogeochemical parameters such as inorganic nutrients (nitrate, ammonium and phosphate), total alkalinity (TA), dissolved inorganic carbon (DIC), partial pressure of carbon dioxide (pCO2), dissolved oxygen (O2), photosynthetic pigments, particulate organic carbon (POC), dissolved organic carbon (DOC), Transparent Exopolymer Particles (TEP), primary production, and calcification. This dynamic model is based on unbalanced algal growth and balanced bacterial growth. In order to adequately reproduce the observations, the model includes an explicit description of phosphorus cycling, calcification, TEP production and an enhanced mortality due to viral lysis. The model represented carbon, nitrogen and phosphorus fluxes observed in the mesocosms. Modelled profiles of algal biomass and final concentrations of DIC and nutrients are in agreement with the experimental observations. [less ▲]

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See detailM- Service Value Perceptions and Customer Loyalty
Pihlstrom, M.; Liljander, V.; Van Riel, Allard ULg

Poster (2008, July 14)

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See detailMulti- Channel Service Management: How well Integrated are the Channels?
Liljander, V.; Pihlstrom, M.; Van Riel, Allard ULg

Poster (2008, July 14)

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See detailOnline Grocery Shopping: The Challenge of Home Delivery Service
Hammedi, Wafa ULg; Van Riel, Allard ULg

Poster (2008, July 14)

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See detailSerum cardiac troponin I concentrations as a diagnostic aid of pericarditis in cattle
Guyot, Hugues ULg; Sartelet, Arnaud ULg; Leidinger, K. et al

Poster (2008, July 10)

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See detailWhole blood viscosity and viscoelasticity in healthy dairy cows
Sandersen, Charlotte ULg; Dringenberg, B.; Vandeputte, Sébastien ULg et al

Poster (2008, July 10)

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See detailFunctional diversity of microbial communities associated to the mucus of scleractinians around Moorea (French Polynesia)
Ladrière, Ophélie ULg; Theunis, Laetitia; Wilmotte, Annick et al

Poster (2008, July 07)

Mucus production by scleractinians appears as an antifouling mechanism which prevents settlement of other organisms and accumulation of sediments on their surface. This Surface Muccopolysaccharide Layer ... [more ▼]

Mucus production by scleractinians appears as an antifouling mechanism which prevents settlement of other organisms and accumulation of sediments on their surface. This Surface Muccopolysaccharide Layer (SML) harbours dense populations of bacteria which play a paramount role in scleractinians nutrition, metabolism and good health maintenance. However, environmental disturbances can alter these microbiocenoses. Characterization of bacterial communities was carried out using a set of simple techniques that enable us to describe the state and functions of whole microbial communities associated with different hard coral species. Multi-comparisons have been performed on bacterial communities from open water, interstitial water, sedimentary interface and macro algae as well as between healthy and bleached colonies, and patches associated or not with Pomacentridae fishes. The functional study included measurements of bacterial biomass, respiration, oxydative and hydrolytic metabolisms. Non-Fungiidae corals and sedimentary interface have a quite similar bacterial biomass but open water, interstitial water and macro-algae are characterized by higher bacterial biomass. Bacterial respiration potential is similar on corals and at the sedimentary interface, but it is higher in interstitial water and lower in open water and for bacterial community associated with macro-algae. Hydrolytic activities are highest in SML. Bleached corals and patches associated with Pomacentridae fishes show more abundant bacteria, with higher respiration rate and higher hydrolytic activity than corals without fishes and healthy ones. In addition, bacteria of bleached corals display a higher division percentage, a higher growth rate and a lower turn-over time We confirmed that bleaching events or the presence of sedentary fishes modify the bacterial communities structure and affect relationships between coral, endosymbiotic algae, SML-associated microbial community and associated organisms. Such results highlight that SML-bacterial communities are modified by bleaching and raise the question of a potential protection of fishes against pathogens. [less ▲]

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See detailClick chemistry for 18F labelling of bioactive compounds
Paris, Jérôme ULg; Thonon, David ULg; kech, cecile et al

Poster (2008, July 03)

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See detailA genome scan for athletic performance in the thoroughbred.
Durkin, Keith ULg; Raudsepp, T; Skow, L.C. et al

Poster (2008, July)

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See detailMicrobiological control on the cycling of Fe and its isotopes in Antarctic sea ice
Schoemann, V.; de Jong, J.; Lannuzel, D. et al

Poster (2008, July)

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See detailImpact of the spray drying conditions on inulin's physical properties
Ronkart, Sébastien; Blecker, Christophe ULg; Deroanne, Claude et al

Poster (2008, July)

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See detailMandibular osteodistraction as a corrective method for class II malocclusions in the horse.
Verwilghen, Denis; Van Galen, Gaby; Busoni, Valeria ULg et al

Poster (2008, July)

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See detailMeasured and modeled trends of stratospheric Cly and Fy column amounts in the northern hemisphere
Ruhnke, Roland; Blumenstock, Thomas; Borsdorff, Tobias et al

Poster (2008, July)

The german HGF virtual institute PEP (Pole-Equator-Pole) has been established in 2004 in order to investigate the variability of atmospheric trace constituents along a north-south transection. Within PEP ... [more ▼]

The german HGF virtual institute PEP (Pole-Equator-Pole) has been established in 2004 in order to investigate the variability of atmospheric trace constituents along a north-south transection. Within PEP the HGF centres AWI and FZK as well as the german Universities of Bremen, Karlsruhe and Potsdam combine their knowledge and capabilities in ground-based measurements and global and regional modelling of atmospheric trace constituents and aerosols. Here we present results of long-term measurements of the stratospheric column of HCl, ClONO2, HF, and O3 obtained at the different PEP stations in the northern hemisphere and in addtion at Jungfraujoch. All stations are affiliated to the NDACC (Network for the Detection of Atmospheric Composition Change). The measured time series are compared with long-term model calculations performed with a state of the art 2-D model of the University of Bremen and the 3-D CTM KASIMA. Please note, that the lowest altitude for the determination of the total columns is about 7 km leading to a slight underestimation w.r.t. the measurements. [less ▲]

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See detailMyofibroblastic inflammatory urinary bladder tumors in dogs: report of 8 cases
Bohme, Béatrice; Ngendahayo, P.; Hamaide, Annick ULg et al

Poster (2008, July)

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See detailPenile aneurysmal bone cyst causing urethral obstruction in a dog
Saulnier-Troff, François-Guillaume; Busoni, Valeria ULg; Hamaide, Annick ULg

Poster (2008, July)

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See detailNMR Studies of Solutions of Actinide Ions and their Complexes. Relaxation and Spectroscopy
Braekers, Damien; Peters, Christelle; Vidick, Geoffrey ULg et al

Poster (2008, July)

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See detailIsoprenoid metabolism in aphid : A new target for bioinsecticides development
Vandermoten, Sophie ULg; Charloteaux, Benoît ULg; Santini, Sébastien et al

Poster (2008, July)

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See detailThe first geological maps of Belgium on the web
Anceau, Annick ULg; Nizet, Laurent ULg

Poster (2008, July)

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See detailA working methodology for the total water determination in inulin by the volumetric Karl Fischer titration.
Ronkart, Sébastien; Blecker, Christophe ULg; Fougnies, C. et al

Poster (2008, July)

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See detailImpact of physical properties of inulin on stability during moisture sorption.
Ronkart, Sébastien; Paquot, Michel ULg; Fougnies, C. et al

Poster (2008, July)

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See detailStudy of the stability and the physical property changes of amorphous inulin during moisture adsorption
Ronkart, S.; Paquot, Michel ULg; Fougnies, C. et al

Poster (2008, July)

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See detailInterference in the light emitted by a single tunneling atom
Martin, John ULg; Braun, Daniel

Poster (2008, July)

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See detailNew pH-sensitive flower micelles for drug delivery systems
Cajot, Sébastien ULg; Van Butsele, Kathy; Jérôme, Christine ULg

Poster (2008, June 23)

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See detailElectrospinning of biocompatible polymers for potential biomdical applications
Croisier, Florence ULg; Zalfen, Alina; Aqil, Abdelhafid ULg et al

Poster (2008, June 23)

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See detailToward protein and cell repellent properties by surface modification of intraocular lenses
Bozukova, Dimitriya; Pagnoulle, Christophe; De Pauw, Marie-Claire ULg et al

Poster (2008, June 23)

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See detailDevelopment of a decision-making tool to manage forest storm damage in the Walloon Region (Belgium)
Riguelle, Simon ULg; Jourez, Benoît ULg; Hebert, Jacques ULg

Poster (2008, June 03)

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the ... [more ▼]

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the concerned owners as well as by the whole sector of wood transformation. The aim of this research, which is a regional priority, relates to the realization of a decision-making tool thought not under the constraint of the urgency, when trees are lying down on the ground, but established on the basis of real dramatic cases already experienced in the past. The tool is dedicated to political and administrative services but, to be effective, calls upon a broad collaboration with all the partners of the wood sector. [less ▲]

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See detailClimatology and circulation of the Azores-Canary region by Data-Interpolation Variational Analysis
Troupin, Charles ULg; Machín, Francisco; Ouberdous, Mohamed ULg et al

Poster (2008, June 02)

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See detailSupercritical carbon dioxide, a tool for the dispersion ROP of lactone and PCL foaming: Part A
Grignard, Bruno ULg; Urbanczyk, Laetitia ULg; Stassin, Fabrice et al

Poster (2008, June 02)

Aliphatic polyesters, namely polylactide (PLA) and poly-ε-caprolactone (PCL) are biodegradable and biocompatible materials that find applications as resorbable suture (PLA) and drugs delivery vectors (PCL ... [more ▼]

Aliphatic polyesters, namely polylactide (PLA) and poly-ε-caprolactone (PCL) are biodegradable and biocompatible materials that find applications as resorbable suture (PLA) and drugs delivery vectors (PCL). Nevertheless, these polymers were mainly prepared by ring opening polymerization using aluminum alkoxide or tin alkoxide initiators in organic media. Recently, the use of supercritical carbon dioxide as polymerization medium was proposed as a potential alternative to the use toxic organic solvents. Nevertheless, due to the non-solubility of PCL in this medium, the growing chains rapidly precipitate during their synthesis leading to the formation of a bulky material that is typical of a precipitation polymerization. This work aims at investigating the dispersion ring-opening polymerization (ROP) of ε-caprolactone in the presence of fluoropolymer-based stabilizers, that were prepared by combining the ring opening polymerization of ε-caprolactone and atom transfer radical polymerization of heptadecafluorodecylacrylate (AC8) and so, stabilizing PCL micrometric particles in supercritical carbon dioxide. In practice, the ROP of CL was initiated by dibutyltin dimethoxide in the presence of PCL-b-PAC8 diblock stabilizers of differents molecular weight and composition. After 24h at 40°C, PCL was collected as a powder that consists of small-sized microspheres. Finally, post-polymerization purification of PCL (removal of tin catalyst that may lead to toxicological problems) was demonstrated to be quite feasible by supercritical fluid extraction (SFE) leading to the preparation of PCL with low catalytic residues. The second goal of this work aims at reporting on the use of sc CO2 for the preparation of foams of poly(epsilon-caprolactone) (PCL), that could be useful in the packaging sector and/or the biomedical sector as potential scaffolds for tissue engineering but also as substitutes for polystyrene thermoformed trays. The method that consists of saturating a polymer with a compressed or supercritical fluid, such as carbon dioxide followed by depressurization and polymer expansion was investigated. Indeed, no residual product is left in the foam, no toxic gas is produced and no resort to hydrocarbon solvents is required. Moreover, CO2 is cheap, non-toxic, recyclable, non-flammable and the technology of CO2-assisted foaming can be used in either a batch mode or in a continuous mode within a high-pressure extruder. [less ▲]

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See detailEfficiency of sieving or classification for dry fractionation of aot mills and beta-glucans enrichment.
Roiseux, Olivier; Vanderbeke, E.; Blecker, Christophe ULg et al

Poster (2008, June)

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See detailStatistical validation of the Positive and Negative Occupational Stress Inventory.
Barbier, Marie ULg; Peters, Stéphanie ULg; Hansez, Isabelle ULg

Poster (2008, June)

With the emergence of positive psychology a decade ago, focus on psychology has shifted from human weaknesses to human resources. In work psychology, researchers are interested not only in negative ... [more ▼]

With the emergence of positive psychology a decade ago, focus on psychology has shifted from human weaknesses to human resources. In work psychology, researchers are interested not only in negative responses to professional demands, but also in positive responses. The Positive and Negative Occupational Stress Inventory (PNOSI) was designed to measure both constructs with separate items. This idea was later confirmed by Schaufeli, Salanova, Gonzalez-Roma & Bakker (2002) , according to which positive and negative occupational stress are distinct constructs with different causes and consequences, and should be measured with different items. We first asked 150 psychology students to generate words describing positive and negative stress. This enabled us to elaborate 34 items relating to emotional, cognitive, behavioural and physiological stress manifestations. These items were administered to 152 workers. Exploratory factor analyses showed a two-factor underlying structure. The first factor consisted of eleven items measuring Negative Occupational Stress (NOS), the second consisted of eight items measuring Positive Occupational Stress (POS). This structure was tested on another sample of 4666 workers. Exploratory factor analyses confirmed the two-factor structure. The two subscales have good psychometric properties, α = .87 and α = .84 for NOS and POS, respectively. Results show that the PNOSI can be considered a valid tool for measuring positive and negative sides of well-being at work. Further confirmatory factor analyses should first try to confirm and replicate this structure on different samples. Second, convergent and discriminant validity with related concepts, such as burnout and engagement, should also be tested. [less ▲]

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See detailImpact of pre-treatment processing on cereal by-products valorisation through enzymatic extraction of ferulic acid.
Barberousse, Hélène; Roiseux, Olivier; Deroanne, Claude et al

Poster (2008, June)

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See detailFast mapping between grammatical constructions and meaning: An experiment in French children aged 3 to 4
Parisse, Christophe; Dupont, Fanny; Bourdoux, Françoise et al

Poster (2008, June)

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See detailMolecular modelling study of bis-isoquinolinium derivatives as small conductance Ca2+ - activated K+ channel blockers
Dilly, Sébastien ULg; Graulich, Amaury; Chavatte, Philippe et al

Poster (2008, May 30)

Small conductance calcium-activated potassium channels (SK) are widely expressed throughout the central nervous system and the periphery. Three subtypes of SK channels have been identified so far in ... [more ▼]

Small conductance calcium-activated potassium channels (SK) are widely expressed throughout the central nervous system and the periphery. Three subtypes of SK channels have been identified so far in different parts of the brain. Activation of SK channels by a rise in intracellular calcium leads to the hyperpolarisation of the membrane, hence reducing cell excitability. Blocking the SK channels might be beneficial for the treatment of depression, Parkinson’s disease and cognitive disorders. In this context, starting from the scaffold of N-methyl-laudanosine (NML) which is a known SK channel blocker (Scuvée-Moreau et al., 2002), a series of original bis-isoquinolinium derivatives were synthezised and evaluated for their affinity on the apamin-sensitive sites (Graulich et al., 2007). These quaternary compounds are powerful blockers, and the most active ones have 10 times more affinity for SK channels than dequalinium. Based on a conformational analysis, a molecular modeling study was also performed. The heads of the various conformational families were compared to a pharmacophoric model previously described (Dilly et al., 2005). The in silico results are well correlated by the in vitro binding studies. Firstly, a 6,7-dimethoxy or a 6,7,8-trimethoxy substitution is shown to be favourable. Secondly, although the length of the linker has no significant influence in the alkane derivatives, the ortho and meta linkers lead to more favourable conformations than the para linker in the xylene derivatives. [less ▲]

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See detailNeural network involved in self-judgment in young and elderly adults
Feyers, Dorothée ULg; Collette, Fabienne ULg; D'Argembeau, Arnaud ULg et al

Poster (2008, May 29)

In agreement with the literature, we have recently observed that the ventro-medial prefrontal cortex (VMPFC) is activated both in young and elderly subjects during a adjective judgment task requiring ... [more ▼]

In agreement with the literature, we have recently observed that the ventro-medial prefrontal cortex (VMPFC) is activated both in young and elderly subjects during a adjective judgment task requiring judgment about self vs. other in the context of a first (1PP) or third (3PP) perspective-taking (Ruby et al., submitted). Here, we have performed functional connectivity analyses to determine the network of cerebral areas associated to the performance of young and elderly subjects. <br />Results indicate that, in the 1PP condition, activity of the VMPFC is related to the inferior frontal gyrus, parahippocampal gyrus in elderly but to the occipital cortex only in young subjects. In the 3PP condition, functional connectivity exist between the VMPFC and medial frontal gyrus, inferior frontal gyrus and superior temporal areas in elderly, but with occipital and parietal areas only in young subjects. <br />The cerebral areas associated to VMPFC activity in young subjects were previously described as involved both in autobiographical memory retrieval and mentalizing processes. With regard to elderly, the cerebral network evidenced is related to retrieval of semantic and episodic memories (parahippocampal and superior temporal) but also to the attribution of emotional valence to the adjectives (inferior frontal) and perspective taking (medial frontal gyrus). <br />These results indicate (1) that the VMPFC is connected to a larger cerebral network in elderly than in young subjects during self judgements; (2) that young subjects perform the task on the basis of autobiographical information retrieval only, while elderly subjects use supplementary, more reflexive, cognitive processes. [less ▲]

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See detailChlamydomonas reinhardtii proteomics adaptations in response to the absence of the energy-dissipating alternative oxidase
Mathy, Grégory ULg

Poster (2008, May 28)

The Alternative oxidase (AOX) is an ubiquinol-oxygen oxidoreductase found in the mitochondrial inner membrane of plants, fungi and protists. In mitochondria, AOX activation creates an electron ... [more ▼]

The Alternative oxidase (AOX) is an ubiquinol-oxygen oxidoreductase found in the mitochondrial inner membrane of plants, fungi and protists. In mitochondria, AOX activation creates an electron partitioning between the cytochrome pathway (CIII + CIV) and AOX. This partitioning leads to a decrease of proton pumping efficiency by the respiratory chain complexes per O2 consumed. Two closely related physiological roles are attributed to AOX: First, AOX in conjunction with rotenone insensitive NADH dehydrogenases, generates a fully non-coupled (energy dissipative) electron transport chain in the mitochondria, which is believed to play an important role in regenerating oxidized cofactors required for others metabolic demands. The second proposed role of AOX is to prevent an important increase the QR/Qt ratio and consequently, to prevent reactive oxygen species (ROS) production. In Chlamydomonas reinhartii AOX is encoded by two different genes, the AOX1 gene being much more transcribed than AOX2. In addition, the expression of the AOX1 gene is generally unresponsive to a number of known AOX allosteric effectors, but is down-regulated by ammonium and up-regulated by nitrate. In the present work, we performed a comparative proteomic study of isolated mitochondria by using the 2D-DIGE methodology to evidence the effects of AOX1 silencing on Chlamydomonas mitochondrial soluble proteome cultivated on nitrate in myxotrophic conditions [less ▲]

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

Poster (2008, May 27)

L’apparition inopinée d’un chablis de grande ampleur nécessite une réaction appropriée et rapide de la part des pouvoirs publics, des propriétaires concernés et des partenaires de la filière bois. Hélas ... [more ▼]

L’apparition inopinée d’un chablis de grande ampleur nécessite une réaction appropriée et rapide de la part des pouvoirs publics, des propriétaires concernés et des partenaires de la filière bois. Hélas, la multitude de cas de figure, l’importance des dégâts, la complexité de la situation et le désarroi profond des acteurs ne permettent généralement pas d’avoir une vision globale et fiable du problème dans un délai qui doit nécessairement être très bref, s’agissant d’un matériau biologique périssable. L’objectif de cette recherche, qui est une priorité régionale, porte sur la réalisation d’un outil d’aide à la décision conçu non pas sous la contrainte de l’urgence, mais établi sur base de cas réels vécus lors des derniers épisodes dramatiques. [less ▲]

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See detailMicroscopie virtuelle appliquée à l'anatomie du bois
Jourez, Benoît ULg; Hérin, Michel; Gheysen, Thibaut ULg et al

Poster (2008, May 27)

La microscopie virtuelle est une approche innovante, complémentaire à la microscopie optique classique. Elle permet le traitement et la transmission d'images de coupes anatomiques digitalisées à très ... [more ▼]

La microscopie virtuelle est une approche innovante, complémentaire à la microscopie optique classique. Elle permet le traitement et la transmission d'images de coupes anatomiques digitalisées à très haute résolution. Les images peuvent être observées à l'écran, sous différents grossissements, mais aussi annotées et organisées en bases de données. Ce nouvel outil ouvert au dialogue et à l’auto-apprentissage est destiné à servir de support didactique dans le cadre de formations sur l'anatomie du bois. Le logiciel prévoit la sélection d’une coupe identifiée par l’essence et un plan ligneux dans une base de données accessible par Internet et organise la prospection de cette coupe selon différents grossissements. Au stade de développement actuel, le logiciel permet de se familiariser à la reconnaissance des plans ligneux de différentes essences forestières et met à la disposition de l'utilisateur divers outils interactifs. Il permet également à l'enseignant de pointer des éléments caractéristiques visibles à différents grossissements et d'y adjoindre des explications ou, a contrario, à pointer des éléments qui devront être identifiés par les étudiants. [less ▲]

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See detailRelation sylviculture - qualité du bois du douglas (Pseudotsuga menziesii) en Région wallonne
Henin, Jean-Marc; Pollet, Caroline; Ponette, Quentin et al

Poster (2008, May 27)

A partir d'un échantillon de peuplements présentant des sylvicultures contrastées, le projet a pour objectif de déterminer les limites de vitesse de croissance qui garantissent l’adéquation de la ... [more ▼]

A partir d'un échantillon de peuplements présentant des sylvicultures contrastées, le projet a pour objectif de déterminer les limites de vitesse de croissance qui garantissent l’adéquation de la production ligneuse à la demande de l’industrie. C’est pourquoi le projet vise à étudier les relations entre les propriétés du bois et les caractéristiques du traitement sylvicole appliqué aux peuplements de douglas dans les conditions environnementales de la Région wallonne. [less ▲]

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See detailAnalyse des caractéristiques intrinsèques du bois de robinier (Robinia pseudoacacia L.)
Pollet, Caroline; Jourez, Benoît ULg; Hebert, Jacques ULg

Poster (2008, May 27)

Compte tenu de ses nombreuses qualités tant écologiques (fleurs mellifères, fixation de l’azote atmosphérique, fixation des sols) que technologiques (très bonne durabilité naturelle,très bonnes ... [more ▼]

Compte tenu de ses nombreuses qualités tant écologiques (fleurs mellifères, fixation de l’azote atmosphérique, fixation des sols) que technologiques (très bonne durabilité naturelle,très bonnes résistances mécaniques), reportées par des études menées en Amérique du nord et en Europe de l’Est, le robinier permettrait d’apporter un élément de réponse aux objectifs de gestion durable et de diversification de nos forêts. Un premier objectif du projet consiste à caractériser la ressource sur base de paramètres décrivant les arbres sur pied, un second à analyser les caractéristiques intrinsèques du bois sur base de ses propriétés physiques, mécaniques et de durabilité naturelle. Un troisième objectif s'attache à déterminer les potentialités d'utilisation industrielle du bois de robinier dans des usages valorisants tels que la fabrication de châssis de fenêtre et de lames de plancher. [less ▲]

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See detailConstruction and Validation of a Phonological Awareness Test Battery for Nursery School Pre-Reading Children
Gabriel, Audrey ULg; Poncelet, Martine ULg

Poster (2008, May 26)

Many studies have shown that the level of development of phonological skills at nursery school is a good indicator of future success in reading acquisition. The aim of this project was to construct and ... [more ▼]

Many studies have shown that the level of development of phonological skills at nursery school is a good indicator of future success in reading acquisition. The aim of this project was to construct and validate a comprehensive phonological awareness test battery for French speaking children. For preschool-level French speaking children, validated phonological awareness test batteries are still lacking. A longitudinal study design was used from a sample of sixty-four children provided education for in the French Community of Belgium. The battery was designed to assess phonological awareness at the rhyme, syllable and phoneme level. A further characteristic of this battery was to use attractive pictorial material enhancing task compliance, and to use identification tasks targeting epiphonological processes as well as manipulation tasks targeting metaphonological processes. At first grade, the same children were given spelling and reading tests in order to determinate the predictif characteristic of this battery. This article briefly presents normative data of the most predictive and discerning tasks of future success in reading and spelling acquisition. [less ▲]

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See detailGd(III)-DOTA conjugate with furtive targeting copolymer poly(AMPEO-co-HEA) by click chemistry for magnetic resonance imaging
Grogna, Mathurin ULg; Bémelmans, Stéphanie; Vanasschen, Christian et al

Poster (2008, May 22)

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See detailSuperhydrophobic surfaces by electrospinning of polymer mixtures
Grignard, Bruno ULg; Vaillant, Alexandre; De Coninck, Joel et al

Poster (2008, May 22)

Hydrophobic surfaces have found great interest in environment resist coating, antifouling marine structures and low friction devices whereas superhydrophobic materials, with contact angle higher than 150° ... [more ▼]

Hydrophobic surfaces have found great interest in environment resist coating, antifouling marine structures and low friction devices whereas superhydrophobic materials, with contact angle higher than 150°, are of special interest in self-cleaning surfaces and stain resistant textiles. (Super)hydrophobicity is a key property that depends on both the surface chemistry and surface roughness. Numerous methods were reported for the preparation of superhydrophobic surfaces by either increasing the surface roughness of an inherently hydrophobic material or decreasing the surface free energy of a rough surface by post-treatment. For instance, controlled crystallization, lithography , etching were reported in the literature for the production of such surfaces. Nevertheless, all these techniques suffer from some drawback such as high cost, time consuming and expensive processes. As an alternative approach, electrospinning was proposed for the production of superhydrophobic surfaces with controlled roughness, morphology and/or porosity. For instance, Acatay et Al. reported on the preparation of electrospun fibers starting from a poly(AN-co-TMI)/fluorolink-D mixture followed by the annealing of these material in order to enable the reorientation of the perfluorinated groups to the solid-air interface. Rutledge et al. described the preparation of superhydrophobic surfaces by combining electrospinning of PCL and initiated chemical vapor deposition of perfluoroalkyl ethyl methacrylate. Allcock et al. prepared superhydrophibic nanofibers by electrospinning of an organic-soluble poly[bis(2,2,2-trifluoroethoxy)phosphazene]. In order to simplify the experimental protocols described in the literature on the preparation of superhydrophobic surfaces and decrease the cost related to the use of pure fluoropolymers, electrospinning of homopolymer/semifluorinated diblock copolymer mixture, i.e. a polyisobornylacrylate/poly(isobornyl acrylate-b-heptadecafluorodecyl acrylate) mixture, onto aluminum plates is proposed in this study. In practice, a diblock copolymer based on 1H,1H,2H,2H heptadecafluorodecyl acrylate and isobornyl acrylate was prepared by RAFT polymerization. In a second step, electrospinning of PIBA/PAC8-b-PIBA mixtures of different compositions was investigated. At high fluorine content ([PIBA]/[PAC8-b-PIBA] = 50/50), the electrospun mats show high surface roughness (microparticles of undefined morphologies) and a superhydrophic character. By decreasing the fluorine content, the morphology of the films changed from particles to beaded fibers (([PIBA]/[PAC8-b-PIBA] = 70/30) or fibers (([PIBA]/[PAC8-b-PIBA] = 85/15), which is consistent with an increase of the solution viscosity, but the surfaces still demonstrate or tend to superhydrophobicity. [less ▲]

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See detailNovel biodegradable pH-sensitive flower micelle
Cajot, Sébastien ULg; Van Butsele, Kathy; Jérôme, Christine ULg

Poster (2008, May 22)

Detailed reference viewed: 49 (12 ULg)
See detailKey role of metal-coordination in cobalt mediated radical polymerization
Debuigne, Antoine ULg; Poli, Rinaldo; Jérôme, Christine ULg et al

Poster (2008, May 22)

Detailed reference viewed: 7 (1 ULg)
See detailPolyolefin matrixes with permanent antibacterial activity: preparation, antibacterial activity, and action mode of the active species
Lenoir, Sandrine; Pagnoulle, Christophe; Galleni, Moreno ULg et al

Poster (2008, May 22)

Detailed reference viewed: 39 (12 ULg)
Peer Reviewed
See detailCognition in Chronic Fatigue Syndrome as compared with major depression
Gillain, B.; Adam, Stéphane ULg; Seron, Xavier et al

Poster (2008, May 21)

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See detailAxions & Polarisation of Quasars
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

Poster (2008, May 21)

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See detailStudy of neuronal cells preconditioning by ESR
Guelluy, Pierre-Henri ULg; Deby-Dupont; Hoebeke, Maryse ULg

Poster (2008, May 16)

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Peer Reviewed
See detailSyntheses of well-defined PLA and PLA-PEO-PLA copolymers from PEO block
Köttgen, Cindy; Grandfils, Christian ULg

Poster (2008, May 16)

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See detailAltération des traitements séquentiels chez les enfants dysphasiques
Gabriel, Audrey ULg; Maillart, Christelle ULg; Meulemans, Thierry ULg

Poster (2008, May 15)

Contexte : Peu de travaux ont été consacrés au développement des habiletés non linguistiques des enfants dysphasiques. Ce constat est paradoxal car des études montrent que les enfants porteurs de troubles ... [more ▼]

Contexte : Peu de travaux ont été consacrés au développement des habiletés non linguistiques des enfants dysphasiques. Ce constat est paradoxal car des études montrent que les enfants porteurs de troubles dits « spécifiques » présentent d’autres troubles non langagiers associés, notamment des troubles séquentiels (Ellis Weismer et al., 2005). D’un point de vue clinique, le pronostic concernant leur évolution semblerait parfois plus lié aux résultats obtenus aux épreuves non linguistiques (particulièrement celles impliquant un traitement séquentiel) qu’à la sévérité du déficit langagier ou à des caractéristiques langagières précises. Objectifs : Ce projet vise une meilleure compréhension de l’implication des traitements séquentiels dans l’origine de cette pathologie à des fins d’éclaircissement de l’étiologie et d’optimisation de prise en charge de ces patients, parfois très hétérogènes. Méthodologie : Apprentissage d’informations séquentielles et simultanées présentées visuellement et évaluation de son maintien auprès d’enfants dysphasiques âgés entre 6 et 12 ans, appariés à des sujets contrôles au niveau de l’âge chronologique et du QIP. Résultats : les résultats seront discutés ultérieurement. Toutefois, nous émettons l’hypothèse que les enfants dysphasiques obtiendraient des performances en dessous de la moyenne des enfants de même âge chronologique à toutes les épreuves faisant appel à un traitement séquentiel, contrairement aux épreuves faisant appel au traitement simultané. Conclusion : Les tâches qui requerraient un traitement séquentiel seraient altérées chez les enfants dysphasiques. Ceci n’a rien de surprenant étant donné que le langage est lui-même une activité séquentielle dans laquelle le mot constitue un ordre défini de phonèmes (Keele et al., 2003). [less ▲]

Detailed reference viewed: 218 (19 ULg)