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See detailCO2 culling with Influenza Containment Systems (ICS)
Kamers, B.; Everaert, Nadia ULg; Tona, K. et al

Poster (2010)

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See detailA close look at the RGS spectra of the O4Ief star Zeta Pup
Rauw, Grégor ULg; Flores, A.; Nazé, Yaël ULg et al

Poster (2010)

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See detailImpact of tree species on the distribution of alkaliextractable Si in a Cambisol
Cornelis, Jean-Thomas ULg; Ranger, Jacques; Delvaux, Bruno

Poster (2010)

Abstract : In terrestrial ecosystems, silicon (Si) uptake by higher plants induces biogenic silica (BSi) deposits in leaves, which contribute to the amorphous silica (ASi) pool in soil through litter-fall ... [more ▼]

Abstract : In terrestrial ecosystems, silicon (Si) uptake by higher plants induces biogenic silica (BSi) deposits in leaves, which contribute to the amorphous silica (ASi) pool in soil through litter-fall. In forests, the ASi pool, including BSi, is ubiquitous and a substantial component of soils, which might influence the Si mass-balance at watershed scale. Here, we examined the distribution of ASi pool, estimated by alkaline dissolution (alkali-extractable Si), in an acid brown soil under three common European tree species in identical soil and climate conditions in order (i) to study how the Si recycling by tree species impacts the ASi pool in soil, and (ii) to identify the different constituents of the alkali-extractable Si pool in soil. We therefore quantified the ASi concentration with alkaline extraction (Na2CO3, 0.1M), the Si adsorbed onto poorly crystalline Fe oxides by oxalate extraction and the “plant-available Si” by CaCl2 extraction. In humus layer, the alkali-extractable Si concentration (mg SiO2 g-1) significantly decreases in the sequence: Douglas fir (14.5±0.65) > European beech (11.8±0.30) > Black pine (5.4±0.31). Below 15 cm soil depth, the alkali-extractable Si concentration is not significantly different between tree species. For each tree species, the alkali-extractable Si concentration in soil decreases from the humus layer to 15 cm depth and then slightly increases from 15 to 75 cm depth. Our data clearly show that tree species can impact the ASi content in topsoil (humus layer - 15 cm) through different Si uptake rates. Indeed, various Si recycling by forest vegetation imply different rates of BSi accumulation in leaves and then, different rates of BSi restitution on topsoil. In mineral layers, pedogenic processes play an important role in the ASi distribution given the alkali-extractable Si pool is mostly influenced by BSi dissolution, stable BSi preservation/translocation and secondarily by Si adsorption onto active amorphous Fe oxide surface. [less ▲]

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See detailA 500-yr record of Northern Patagonian environmental changes: Lago Plomo and Lago Bertrand
Fagel, Nathalie ULg; Brix, J.; El Ouahabi, M. et al

Poster (2010)

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See detailSelf-Awareness Therapy (SAT) for Schizophrenic Patients
Boulanger, Marie ULg; Nachtergael, Hilde; Pauly, Marc et al

Poster (2010)

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See detailModeling Microbial Cross-contamination in Quick Service Restaurants by Means of Experimental Simulations With Bacillus Spores
Baptista Rodrigues, Ana Lúcia ULg; Crevecoeur, Sébastien ULg; Dure, Remi et al

Poster (2010)

Cross contamination has been frequently mentioned as being in the origin of a wide range of food borne outbreaks. Handling of food is one of the ways through which cross contamination may occur. For many ... [more ▼]

Cross contamination has been frequently mentioned as being in the origin of a wide range of food borne outbreaks. Handling of food is one of the ways through which cross contamination may occur. For many different reasons, quick service restaurants are particularly at risk. Due to its importance, cross contamination via the hands should be taken into consideration when carrying out a quantitative risk assessment. The main goal of this study was to determine transfer rates of bacteria to and via the hands, reduction rates of two hand sanitizing procedures and to apply the results to a quantitative microbial risk assessment model. According to our results, handling of a portion of raw minced meat contaminated at 4.104 cfu leads to the presence of 24 cfu on both hands, 3 cfu on ready-to-eat product (RTE) manipulated with unwashed hands, 1 cfu on RTE manipulated with wiped hands and absence on RTE manipulated with washed hands. This study provides adequate quantitative data for quantitative microbial risk assessment. [less ▲]

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See detailA mid-size city and IYA09: a case study
Nazé, Yaël ULg

Poster (2010)

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See detailResidual stress measurement in dental prostheses by hole-drilling.
Mainjot, Amélie ULg; Schajer, Gary; Vanheusden, Alain ULg et al

Poster (2010)

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See detailBacillomycin D and mycosubtilin, antimicrobial lipopeptides from Bacillus subtilis. A comparative analysis of their interfacial properties
Nasir, Mehmet Nail ULg; Besson, Françoise

Poster (2010)

Bacillus subtilis strains produce antimicrobial lipopeptides using non ribosomal peptide synthesis pathway. Among them, those belonging to iturinic family have an important place. This family is ... [more ▼]

Bacillus subtilis strains produce antimicrobial lipopeptides using non ribosomal peptide synthesis pathway. Among them, those belonging to iturinic family have an important place. This family is characterized by a peptide ring with a constant LDDLLDL chiral amino acid sequence cycled by a -fatty acid with a variable acyl chain. The iturinic lipopeptides exhibit their biological activities on the plasma membrane of the microbial cells. It has been demonstrated that they could be active on pathogenic strains which are resistant to currently-used therapeutic agents. Despite their interesting antimicrobial properties, there is limited number of works on their interactions with plasma membranes in order to understand their mode of action. Langmuir monolayers at the air-water interface are a useful tool to analyze the interactions between antimicrobial lipopetides and membranes. We therefore investigated iturinic lipopeptides-membrane interactions using Langmuir monolayers as membrane model. Our work focused on two iturinics, mycosubtilin and bacillomycin D, differing by their peptide ring (Figure 1). In the first step, we investigated their interfacial properties using tensiometry measurements and polarization modulation infrared reflexion absorption spectroscopy (PM-IRRAS). We found that the ability to form an interfacial film for two lipopeptides was different depending on the nature of the subphase. Moreover, their conformations at the air-water interface were determined as turns. In the second step, we investigated the insertion of the mycosubtilin and bacillomycin D in the lipid monolayers by determining their exclusion surface pressures. Our results showed that the insertion depends on the nature of the lipid film hence a membrane-compostion-dependant action of the two antimicrobial compounds could be explained. [less ▲]

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See detailEpidemiologic study of pestivirus infection in both wild and domestic ruminants A survey in the Ubaye Valley (Alpine mountains, France)
Martin, Claire; Duquesne, Véronique; Adam, Gilbert et al

Poster (2010)

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See detailComparison of hydrodynamic parameters obtained by 2D measurements in a flat rectangular column with X-ray radiography and data from literature on 3D columns
Calvo, Sébastien ULg; Beugre, Djomice Antoine ULg; Crine, Michel ULg et al

Poster (2010)

Hydrodynamic tests are performed in a flat rectangular column packed with two sheets of Mellapak 250 Y (Sulzer structured packing). Measurements are realized with a single phase liquid flow as well as ... [more ▼]

Hydrodynamic tests are performed in a flat rectangular column packed with two sheets of Mellapak 250 Y (Sulzer structured packing). Measurements are realized with a single phase liquid flow as well as with a gas-liquid counter-current flow. Hydrodynamic parameters are compared to experimental results obtained in 3D columns found in the literature, as well as to literature model predictions and to values computed using an in-house Lattice Boltzmann CFD simulation code. [less ▲]

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See detailFeasibility study of a Software Defined Radio and its adaptation to space
Heukemes, Mirko; Rainaut, Laurent; Denis, Amandine ULg et al

Poster (2010)

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See detailTraces metal inputs in the Misten bog (East Belgium): Level of contamination and spatial variability
Allan, Mohammed ULg; Fagel, Nathalie ULg; De Vleeschouwer, François et al

Poster (2010)

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See detailApproaches for assessing potential impacts of thyroid hormone disrupting chemicals in wild sea bass (Dicentrarchus labrax)
Schnitzler, Joseph ULg; Klaren, Peter; Thomé, Jean-Pierre ULg et al

Poster (2010)

Organic compounds such as pesticides and polychlorobiphenyls (PCBs) are well described endocrine disrupters; of particular interest are effects on thyroid function. To assess the ability of occurring ... [more ▼]

Organic compounds such as pesticides and polychlorobiphenyls (PCBs) are well described endocrine disrupters; of particular interest are effects on thyroid function. To assess the ability of occurring pollutants in European coastal areas to disrupt the thyroid system in sea bass, a field study in the major European estuaries, namely, the Scheldt, the Seine, the Loire, the Charente and the Garonne has been conducted. Several thyroid endpoints were simultaneously examined. Diameter of follicles and the epithelial cell heights give an indication on the production and secretion activity of the thyroid gland. The activity of enzymes involved in the metabolism (deiodination, glucuronidation and sulfatation) of thyroid hormones was analyzed. Finally thyroxine (T4) and triiodothyronine (T3) concentrations were analyzed in muscle by radioimmunoassay. The combined use of all those endpoints gives us an overview of the complex thyroid hormone system. PCB concentration in wild fish varied from 10 to 100 ng g-1 wet weight (ww) depending on length and location. Each region has its own contamination levels and profiles reflecting the contribution of pollutants from rivers. The contamination levels were as follows: the highest concentrations were measured in individuals collected from the coastal region near the Scheldt > Seine > Loire > Charente and the lowest levels were observed in sea bass from coastal regions near the Garonne. Measurements of metabolic activity revealed an altered hepatic T4 outer ring deiodinase whereas T4 sulfatation and T4 glucuronidation were not affected. Owing to the extensive autoregulatory feedback at both central and peripheral levels, the thyroid hormone concentrations were preserved despite the PCB induced changes in thyroid hormone dynamics. [less ▲]

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See detailWater dynamics in the soil-plant continuum: which features regulate the uptake?
Lobet, Guillaume ULg; Javaux, M.; Pagès, L. et al

Poster (2010)

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See detailStudy of the surface and membrane properties of a bolaform surfactant issued from alkenyl D-xyloside
Deleu, Magali ULg; Damez, Céline; Gatard, Sylvain et al

Poster (2010)

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See detailFirst man in the eastern Finland : an Early Mesolithic inland site with a red-ochre grave in Joensuu Rahakangas
Pesonen, Petro; Hertell, Esa; Nyholm, Mikael et al

Poster (2010)

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See detailCharacterization of the antimicrobial activity of mycosubtilin on the plasma membranes. A biomimetic approach
Nasir, Mehmet Nail ULg; Besson, Françoise

Poster (2010)

Mycosubtilin, an antimicrobial lipopeptide, is produced by Bacillus subtilis strains. It belongs to the iturin family, which is characterized by the presence of a peptide part, constituted of a constant ... [more ▼]

Mycosubtilin, an antimicrobial lipopeptide, is produced by Bacillus subtilis strains. It belongs to the iturin family, which is characterized by the presence of a peptide part, constituted of a constant chiral amino acid sequence cycled by a β-amino fatty acid (Fig. 1). As all the iturinic lipopeptides, mycosubtilin exhibits its biocide activities on cytoplasmic membrane of target cells [1]. Recently, the activity of mycosubtilin on pathogenic strains resistant to classical agents was shown [2]. However, despite many works focused on its structure and the optimization of its production, only a few studies are conducted to analyze mycosubtilin-membrane interactions. The purpose of our work was to better understand, at the molecular level, the mechanisms of the mycosubtilin activity on cytoplasmic membranes. Firstly, we modelled the mycosubtilin-membrane interactions by using biomimetic monolayers and their associated techniques (tensiometry and PM-IRRAS). After characterizing the interfacial properties of pure mycosubtilin [3], we used Langmuir films to investigate the mycosubtilin behavior when the lipopeptide reaches the external leaflet of the membrane. We found that the mycosubtilin adsorption to lipid monolayers depended on their lipid composition and the lipopeptide interaction with the membrane was facilitated by the presence of sterols. Then, we mimicked the insertion of the lipopeptide in the whole membrane by using multilamellar vesicles. FT-IR spectroscopy analysis showed that the interaction of mycosubtilin with the artificial membranes induced conformational changes of the lipopeptide only in the presence of sterol. 1. Maget-Dana R, Peypoux F. (1994) Toxicology 87:151-74. 2. Fickers P, Guez JS, Damblon C, Leclère V, Béchet M, Jacques P, Joris B. (2009) Appl. Environ. Microbiol. 75:4636-40. 3. Nasir MN, Thawani A, Kouzayha A, Besson F. (2010) Colloids Surf. B Biointerfaces 78 :17-23. [less ▲]

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See detailDéfinition d’indices successionnels pour la caractérisation de la dynamique post-culturale
Bangirinama, F; Bigendako, M J; Lejoly, J et al

Poster (2010)

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See detailDecadal changes of carbon dioxide in the Scheldt estuary
Borges, Alberto ULg; Middelburg, J. J.

Poster (2010)

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See detailHD 150136: towards one of the most massive systems?
Mahy, Laurent ULg; Gosset, Eric ULg; Rauw, Grégor ULg et al

Poster (2010)

The improvement of the astronomical instrumentation allowed scientists to develop new analysis techniques to investigate binary and multiple stars. In this context, we present the preliminary results of ... [more ▼]

The improvement of the astronomical instrumentation allowed scientists to develop new analysis techniques to investigate binary and multiple stars. In this context, we present the preliminary results of an intense monitoring devoted to the triple system, HD 150136. Supposed to be the nearest O3 star (1.3 kpc), this object is also composed of two other early O-type stars, making it one of the most massive systems known until now (~ 134Mʘ). This multiple star is a non-thermal radio emitter and presents a colliding wind interaction zone. To determine the physical parameters of this system, we applied a disentangling program to study individually the three components. It allows us to revise their spectral classification and to derive a new orbital solution for the short-period system but also the first one for the entire system. [less ▲]

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See detailcAbVIM4, a nanobody inhibiting the metallo-β-lactamase VIM-4
Sohier, Jean ULg; Laurent, Clémentine ULg; Pardon, Els et al

Poster (2010)

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See detailGene expression of the lipoxygenase pathway in a tomato species tolerant to salt stress
Ghars, Mohamed Ali ULg; Muhovski, Y.; Ghanem, M. et al

Poster (2010)

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See detailProteomic study of cold-repressed proteins in the Antarctic bacterium Pseudoalteromonas haloplanktis TAC125
Piette, Florence; D'Amico, Salvino; Leprince, Pierre ULg et al

Poster (2010)

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See detailhCG: a pregnancy-related hormone stimulating angiogenesis and pericyte recruitment
Berndt, S; Blacher, Silvia ULg; Perrier d’Hauterive, S et al

Poster (2010)

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See detailNumerical simulations of the wind of magnetic massive star HD191612
ud-Doula, Asif; Nazé, Yaël ULg

Poster (2010)

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See detailHyperfine structure splitting of molecular-iodine transitions near 716 nm
Huet, Nicolas ULg; Krins, Stéphanie ULg; Dubé, P. et al

Poster (2010)

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See detailTHE NORMAL ANATOMICAL DEVELOPMENT OF THE FOAL FOOT DESCRIBED WITH MULTI DETECTOR COMPUTED TOMOGRAPHY (MDCT)
Van Thielen, B.; Murray, R.; Van Dooren, J. P. et al

Poster (2010)

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See detailMicroenvironment and cell fate determination in MCF10A is mediated by ionizing radiation, TGF beta and the extracellular matrix
Fernandez-Garcia, Ignacio; Paupert, Jenny ULg; Barcellos-Hoff, Mary-Helen

Poster (2010)

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See detailPrimary versus secondary failure following varicella vaccination: implications for interval between two doses-Literature review
Bonanni, Paolo; Gershon, Anne; Gershon, Michael et al

Poster (2010)

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See detailUsing time-dependent reference profiles for an instability analysis of an evaporating binary liquid layer
Machrafi, Hatim ULg; Rednikov, Alexey; Colinet, Pierre et al

Poster (2010)

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See detailDiagnostic de l’exploration botanique des Caesalpinioideae et Mimosoideae de l’Afrique centrale
Ndayishimiye, J; Bamba, I; Stoffelen, P et al

Poster (2010)

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See detailL'organométallique au service des extraits naturels
Ramdani, R.; Ghazi, Z.; Fadel, O. et al

Poster (2010)

Le Maroc est considéré parmi les pays méditerranéens les plus riches en ressources naturelles, notamment, les plantes aromatiques et médicinales. La valorisation des extraits naturels passe soit par des ... [more ▼]

Le Maroc est considéré parmi les pays méditerranéens les plus riches en ressources naturelles, notamment, les plantes aromatiques et médicinales. La valorisation des extraits naturels passe soit par des échantillons à l’état brut, soit en les transformant en d’autres structures chimiques nouvelles. [less ▲]

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See detailFunctional interplay between macroH2A and Polycomb Repressive Complexes
Creppe, Catherine ULg; Valero, Vanesa; Di Croce, Luciano et al

Poster (2010)

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See detailCharacterisation of B1 metallo-beta-lactamase inhibition by VHHs
Sohier, Jean ULg; Laurent, Clémentine ULg; Chevigné, Andy et al

Poster (2010)

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See detailMonitoring endocrine profiles for prediction of stillbirth in Holstein-Friesian dairy cattle
Szenci, O.; Bajcsy, A. C.; Bryd, E. et al

Poster (2010)

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See detailMacaronesia: a source of hidden genetic diversity for post-glacial recolonization of western Europe in the leafy liverwort Radula lindenbergiana.
Laenen, Benjamin ULg; Desamore, Aurélie ULg; Devos, Nicolas et al

Poster (2010)

Aim Bryophytes exhibit the lowest rates of endemism among biota in Macaronesia and differ in diversity patterns from angiosperms by the widespread occurrence of endemics within and among archipelagos. In ... [more ▼]

Aim Bryophytes exhibit the lowest rates of endemism among biota in Macaronesia and differ in diversity patterns from angiosperms by the widespread occurrence of endemics within and among archipelagos. In this study, we test the hypothesis that high dispersal ability erodes phylogeographic signal and hampers the chances of diversification in bryophytes using the leafy liverwort Radula lindenbergiana as a model. Location Macaronesia, Europe, South Africa Methods 84 samples were collected across the species distribution range and sequenced at four cpDNA loci (atpB-rbcL, trnG, trnL, and rps4). Phylogenetic reconstructions and Bayesian ancestral area reconstructions were used in combination with population genetic statistics (H, Nst, Fst) to describe the pattern of present genetic diversity in R. lindenbergiana and infer its biogeographic history. Results The two regions with the highest haplotypic diversity are Madeira and the Canary Islands. Ancestral area reconstructions suggest that Macaronesia was colonized at least twice independently and that the haplotypes currently found in Western Europe share a Macaronesian common ancestor. Whilst analysis of molecular variance and Nst statistics indicate that present-day patterns of genetic variation have a globally significant biogeographic component, Fst values among Macaronesian archipelagos, North Africa, and the Iberian Peninsula, were not significant. Main conclusions The apparent lack of speciation amongst Macaronesian bryophytes hides actual patterns of diversification at the molecular level. The occurrence of Canarian endemic haplotypes across several islands, along with the non-significant Fst and Nst among islands, North Africa and the Iberian Peninsula, suggest intense dispersal. The occurrence of endemic haplotypes suggests, however, that dispersal does not completely prevent diversification. The high diversity found among Macaronesian haplotypes, together with the Macaronesian origin of all the haplotypes found in Western Europe, suggests that Macaronesian archipelagos could have served as a refugium during the Quaternary glaciations and as a source for re-colonization of Europe. [less ▲]

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See detailUnit stream power as a base for regional river typology
Hallot, Eric ULg; Houbrechts, Geoffrey ULg; Levecq, Yannick et al

Poster (2010)

In order to assess the hydromorphological quality of surface waters, stakeholders need river typologies accurate and functional enough to be a really efficient management tool. From a typological study ... [more ▼]

In order to assess the hydromorphological quality of surface waters, stakeholders need river typologies accurate and functional enough to be a really efficient management tool. From a typological study based a broad set of hydromorphological field data, we have shown that some variables, like the unit stream power (), are particularly appropriate to describe the dynamics of a river. Initial results of repeated measurement in more than 80 sites revealed a regional differentiation based on critical values of stream power at bankfull discharge. The aim of this study is to present a unit stream power mapping for the whole network based on general equation  =  g Q S / w, with  the density of water, g the acceleration due to gravity, Q the discharge, S the slope and w the channel width). Slope is extracted from DEM. Bankfull discharge and width estimations are furnished by allometric equations using the watershed area. Different coefficients are used according to regional differentiations based on bedload size and watershed permeability. The statistical significance of all equations was tested by covariance analysis. A correction taking into account the used log-log scale, was also applied to the obtained allometric equations (Fergusson, 1988). Using a 30 x 30 meters DEM, GIS routines were developed. A first one automatically sectorizes the network and a second evaluates the unit streamspower in each location. We propose a 7-level classification in accordance with the associated morphological processes describe in the literature (from fixed meanders to step-pools system). The mapping unit starts at the Strahler second order. Our results not only support a regional typology, but moreover allow us to describe natural regions in function of river dynamics and to estimate the resistance of restoration works like vegetal techniques. It can also provide estimates of the excess stream power (the fraction of the actual stream power exceeding the power at which bedload particles start to move). (Fergusson, R.,I., 1988. River loads underestimated by rating curves, Water Resour. Res., 24(7), 1217–1219.) [less ▲]

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See detailExploration of perceptual and motor inhibition in children with traumatic brain injury
Catale, Corinne ULg; Lejeune, Caroline ULg; Meulemans, Thierry ULg

Poster (2010)

Inhibitory control, which is commonly considered as one of the essential components of executive functions (Barkley, 1997; Miyake et al., 2000), is not considered as an unitary construct (for example ... [more ▼]

Inhibitory control, which is commonly considered as one of the essential components of executive functions (Barkley, 1997; Miyake et al., 2000), is not considered as an unitary construct (for example, Friedman & Miyake, 2004; Nassauer & Halperin, 2003). In this study, perceptual and motor inhibition were studied in 12 children who had sustained a moderate to severe traumatic brain injury and in 24 matched control children, with the Conflict Resolution task (Nassauer & Halperin, 2003). The perceptual inhibition task required the children to respond to the direction of an arrow while ignoring the conflicting arrow location. In the motor inhibition task, the subject had to press a key corresponding to the opposite direction of a centrally located arrow. Direct comparisons of inhibition performances between traumatic brain injury children and matched controlled subjects showed a specific and disproportionate impairment for motor inhibition (compared to perceptive inhibition) in the traumatic brain injury children, suggesting that inhibition processes might be differentially impaired after traumatic brain injury in children. Interestingly, impairments in behavioural inhibition in day-to-day activities (as reported by the parents), was found to strongly correlate with both types of inhibition. [less ▲]

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See detailCA1838, A NANOBODY INHIBITING THE METALLO-β-LACTAMASE VIM-4.
Sohier, Jean ULg; Laurent, Clémentine ULg; Pardon, Els et al

Poster (2010)

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See detailRELEVANCE OF ACCELERATION AND GRAVITY POWER PROFILING
Jidovtseff, Boris ULg; Harris, Nigel; Cronin, John et al

Poster (2010)

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See detailDesign, implementation, and test of a digitally-controlled electrical power supply for the OUFTI-1 nanosatellite
Kolodziej, Marie; Ledent, Philippe; Thirion, Pierre et al

Poster (2010)

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See detailWeignhing risk factors associated with bee colony collapse disorder by classification and regression tree analysis
Vanengelsdorp, D.; Speybroeck, N.; Evans, J. et al

Poster (2010)

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See detailRoad surface temperature influence on tire/pavement close proximity noise
Bueno, M.; Luong, Jeanne ULg; Vinuela, U.. et al

Poster (2010)

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See detailOut of Africa: north-westwards Pleistocene expansions of the heather Erica arborea
Desamore, Aurélie ULg

Poster (2010)

ntroduction Erica arborea L. is a dominant element of the circum-Mediterranean region. Its broad, disjunct distribution, ranging from Macaronesia to eastern Africa, is consistent with the fragmentation of ... [more ▼]

ntroduction Erica arborea L. is a dominant element of the circum-Mediterranean region. Its broad, disjunct distribution, ranging from Macaronesia to eastern Africa, is consistent with the fragmentation of the evergreen tropical forests that dominated Europe and North Africa in the Tertiary. (fig.1) Aim Is the current disjunct distribution of E. arborea a relict of a once wider distribution or a recent range expansion in response to the establishment of suitable conditions ? [less ▲]

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See detailIncreased mitosis in the bleached gastrodermis of the sea anemone A. pallida
Fransolet, David ULg; Roberty, Stéphane ULg; Plumier, Jean-Christophe ULg

Poster (2010)

Today, coral bleaching represents a major concern for marine biologists, especially considering the upsurge of this phenomenon possibly linked to climate change. Bleached corals, deprived of most of their ... [more ▼]

Today, coral bleaching represents a major concern for marine biologists, especially considering the upsurge of this phenomenon possibly linked to climate change. Bleached corals, deprived of most of their energy incomes, may show a partial or total mortality, which ultimately lead to shifts in reef communities. Studies focusing on cellular bleaching mechanisms have shown different ways by which algae may be expelled from gastrodermal host cells. Among those mechanisms, major emphasis has been put on host cell death, most probably due to both apoptosis and necrosis. Recovering gastrodermis is then expected to undergo regeneration process in order to be reinfected by new algae. We describe here this regeneration process in the bleached sea anemone model A. pallida. [less ▲]

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See detailChilling of carcasses from double muscled cattle: time-temperature evolution and predictive modelling of growth of Listeria monocytogenes and Clostridium perfringens
Delhalle, Laurent ULg; Collignon, Bertrand; Dehard, Sandrine ULg et al

Poster (2010)

The time/temperature combination during carcass chilling is of concern in order to avoid bacterial growth. The chilling speed is lower in carcasses with high muscular development such as large cattle from ... [more ▼]

The time/temperature combination during carcass chilling is of concern in order to avoid bacterial growth. The chilling speed is lower in carcasses with high muscular development such as large cattle from the Belgian Blue breed. Three slaughterhouses were selected for temperature and pH measurements during the chilling process at 6 different days on 4 half carcasses in order to obtain representative data from heavy carcasses with high muscular development. Predictive microbiology was used to evaluate the potential growth of Listeria monocytogenes and Clostridium perfringens on the surface and in the depth of the carcasses. The gamma concept was chosen as secondary model taking into account the effect of temperature, pH and water activity on the selected bacteria during the chilling process. The predicted growth potential of Listeria monocytogenes is influenced by the different environmental conditions of the selected slaughterhouses and could reach 1.4 log CFU/cm² after the chilling process. The potential growth of Clostridium perfringens is limited due to unfavourable conditions during the first hours and to low temperature later. It can be concluded that when the initial level of contaminating bacteria is not excessive the speed at which the carcass is currently chilled is sufficient to limit the growth of these two pathogens and to ensure the product quality. [less ▲]

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See detailPhotoacclimation responses of a symbiotic sea anemone reveal an important host cellular plasticity
Roberty, Stéphane ULg; Fransolet, David ULg; Ladrière, Ophélie ULg et al

Poster (2010)

The high productivity of coral reef ecosystems is largely attributed to the mutualistic symbiosis between reef-building corals and their intracellular dinoflagellate in the genus Symbiodinium commonly ... [more ▼]

The high productivity of coral reef ecosystems is largely attributed to the mutualistic symbiosis between reef-building corals and their intracellular dinoflagellate in the genus Symbiodinium commonly referred to as zooxanthellae. These photosynthetic algae translocate a majority of their photosynthetically fixed carbon to the host and contribute to their metabolic needs and the calcification process. <i>Symbiodinium</i> must maintain a balance between the energy derived from the light reactions in the chloroplast and the amount of energy used during dark reactions and other metabolic processes. Nevertheless, in the natural environment the holobiont have to cope with daily and seasonal changes in light intensity, upsetting that balance and creating a stress that induces a physiological response (photoacclimation) to optimize growth rates. After a ten day exposition to high and very low light intensity, morphological and photophysiological analysis conducted on the symbiotic sea anemone, Anemonia manjano, reveal significant modifications of the host tissues ultrastructure and the Symbiodinium metabolic processes (photosynthesis, respiration). Those results highlight particularly important gastrodermal and ectodermal plasticity in which symbiotic cnidarians acclimate to the Symbiodinium physiological status (mainly photosynthesis) by varying the density of particular cellular types (e.g.: cnidocytes, gastrodermal cells) contained in their tissues. [less ▲]

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See detailSYMBIODINIUM SP. CAN STAY ALIVE THROUGH THE GUT AND IN THE FAECES OF CNIDARIA. PREDATORS. THE CASE OF CORALLIOPHILLA MEYENDORFFI AND ANEMONIA VIRIDIS.
Poulicek, Mathieu ULg; Roberty, Stéphane ULg; Plaza, Sylvain et al

Poster (2010)

The gastropod Coralliophilla meyendorffi is a common predator of the zooxanthellate anemone Anemonia viridis. Zooxanthella from the anemones are an important constitutent of the mollusc faeces. Cell ... [more ▼]

The gastropod Coralliophilla meyendorffi is a common predator of the zooxanthellate anemone Anemonia viridis. Zooxanthella from the anemones are an important constitutent of the mollusc faeces. Cell integrity, occurence of flagellated forms, live/dead proportions and mitotic index of Symbiodinium collected from the faeces and cultivated in vitro were examined and compared to that of algae in hospite. The results show that most algae withstand digestive processes of the predator, staying alive and dividing actively in the faeces. Motile (lagellated) algae arise from dividing cells and escape the fecal pellets. Impact on coral bleaching recovery is discussed. [less ▲]

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See detailMultiproxy, multicore palaeoenvironmental study during the last millennium in the Misten peat bog (Hautes Fagnes, East Belgium).
De Vleeschouwer, François; Fagel, Nathalie ULg; Mauquoy, D. et al

Poster (2010)

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See detailModeling post-combustion CO2 capture with amine solvents
Léonard, Grégoire ULg; Heyen, Georges ULg

Poster (2010)

In order to avoid the emission of large amounts of greenhouse gas, CO2 capture in fossil fuel power plants and subsequent underground CO2 sequestration is studied. The capture occurs by reactive CO2 ... [more ▼]

In order to avoid the emission of large amounts of greenhouse gas, CO2 capture in fossil fuel power plants and subsequent underground CO2 sequestration is studied. The capture occurs by reactive CO2 absorption into chemical solvent systems at moderate temperature (~50°C) followed by solvent regeneration at higher temperature (~120°C). So far, the most employed solvent for acid gas capture is monoethanolamine (MEA). One main drawback of this technology is the high energy consumption necessary to regenerate the solvent. In the present work, the CO2 capture process with MEA is modeled using the simulation tool Aspen Plus®. The base case process is optimized and some process improvements are studied that imply a significant decrease of the process exergy consumption. [less ▲]

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See detailA study of the distant activity of comet C/2006 W3 (Christensen) using Herschel and ground-based radio telescopes
Bockelée-Morvan, D.; Hartogh, P.; Crovisier, J. et al

Poster (2010)

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See detailRedistribution of fibrillarin following treatment of human bladder carcinoma cells with aptatone
Jamison, James; Gilloteaux, Jacques; Perlaky, L et al

Poster (2010)

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See detailIn vitro safety assessment of inhaled products using respiratory epithelial cells
Forbes, Ben; Cao Minh, Quin An; Evrard, Brigitte ULg et al

Poster (2010)

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See detailA STUDY OF THE CORRELATION BETWEEN MACROTEXTURE AND THE TIRE/PAVEMENT CLOSE PROXIMITY NOISE
Luong, Jeanne ULg; Bueno, M.; Teran, F. et al

Poster (2010)

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