References of "Scientific congresses and symposiums"
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See detailImpact of shading on meiofauna in a Posidonia oceanica meadow
Pete, Dorothée ULg; Gobert, Sylvie ULg

Poster (2014, December)

Posidonia oceanica meadow is an endemic ecosystem of the Mediterranean coasts. A known threat to this ecosystem is aquaculture. In zones of intensive fish production, P. oceanica meadow tends to be less ... [more ▼]

Posidonia oceanica meadow is an endemic ecosystem of the Mediterranean coasts. A known threat to this ecosystem is aquaculture. In zones of intensive fish production, P. oceanica meadow tends to be less healthy or to disappear .One of the reasons for this is a decrease in the light that reaches the leaves (direct shading, increase of water turbidity or of epiphytic algae density). Unfortunately, when the meadow begins to die, it is often too late to act. So, people are trying to find indicators that react early to this kind of perturbations. In this framework, this study focuses on the impact of shading (without nutrient enrichment) on the meiofauna living in the surface sediment of a P. oceanica meadow. An in situ shading experiment was led from the end of May to the end of August 2009, at a depth of 10 m, in a reference P. oceanica meadow. Three shading nets were put in the meadow to reach a light extinction of 50%. A control site was also defined. The first two centimetres of sampled sediment cores were studied. After three months of shading, the total abundance of meiofauna at the shading site was lower than at the beginning of the experiment, while it stayed around the same level at the control site. This difference is mainly due to a decrease in the total number of foraminiferans, nematods, gnathostomulids, copepods and bivalves. However, no significant difference in diversity was observed. At the end of this experiment, it appeared that, contrarily to what is mostly said in the literature, the direct organic enrichment that occurs at fish farms is not the only reason to the modification of the meiofauna communities of the ecosystem. The shading by itself has also an effect. [less ▲]

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See detailEvaluation of pairwise calibration techniques for range cameras and their ability to detect a misalignment
Lejeune, Antoine ULg; Grogna, David ULg; Van Droogenbroeck, Marc ULg et al

in International Conference on 3D Imaging (IC3D) (2014, December)

Many applications require the use of multiple cameras to cover a larger volume. In this paper, we evaluate several pair-wise calibration techniques dedicated to range cameras. We compare the precision of ... [more ▼]

Many applications require the use of multiple cameras to cover a larger volume. In this paper, we evaluate several pair-wise calibration techniques dedicated to range cameras. We compare the precision of a self-calibration technique based on the movement in front of the cameras to object based calibration. While the self-calibration method is less precise than its counterparts, it yields a first estimation of the transformation between the cameras and permits to detect when the cameras become mis-aligned. Therefore it is useful in a practical situations. [less ▲]

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See detailEffect of tree species mixture on earthworm communities on a continental scale
De Wandeler, Hans; Baeten, Lander; Carnol, Monique ULg et al

Poster (2014, December)

The belowground food web represents a major part of associated biodiversity in forest ecosystems, and plays a significant role in the ecosystem processes of litter decomposition and nutrient turnover ... [more ▼]

The belowground food web represents a major part of associated biodiversity in forest ecosystems, and plays a significant role in the ecosystem processes of litter decomposition and nutrient turnover. Past research has demonstrated overwhelming evidence of strong tree species identity effects on earthworm communities. It has been proposed that increased plant community diversity would be beneficial to the abundance and diversity of the belowground food web, but effects of tree species diversity on earthworm communities have seldom been reported, and are inconclusive. In this study at continental scale we evaluated whether tree species diversity positively affects earthworm biomass and diversity. For this purpose the FunDivEUROPE Exploratory Platform was used with 209 plots in 6 regions well spread over Europe with a low within-region site variability, but a within-region tree species diversity gradient from monocultures to 3 or 4 species plots. In every plot earthworms were sampled using a combined method of mustard extraction and hand sorting of litter and a soil monolith. Data are being analysed with multivariate tools and mixed effects models. First results suggest only limited influence of tree diversity on the biomass of earthworm communities at continental scale. Tree diversity effects are weak, context specific and interacting with tree identity. In nutrient poor soils we found a negative tree diversity effect on earthworm biomass when deciduous monocultures are enriched with coniferous species, while in rich soils we found a positive tree diversity effect which could be related with the food security this provides to the earthworm community. [less ▲]

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See detailGenetic structure of nase, Chondrostoma nasus, and common barbel, Barbus barbus (Teleostei, Cyprinidae) populations in South Belgium rivers: toward a rational management of conservation restocking
Gennotte, Vincent ULg; Michaux, Johan ULg; Prignon, Christian ULg et al

Poster (2014, December)

Nase (Chondrostoma nasus) and common barbel (Barbus barbus) are two rheophilic cyprinid fish naturally present in the Belgian Meuse and Rhine basins. During the last decades, the construction of dams ... [more ▼]

Nase (Chondrostoma nasus) and common barbel (Barbus barbus) are two rheophilic cyprinid fish naturally present in the Belgian Meuse and Rhine basins. During the last decades, the construction of dams together with changes in hydrological regimes, modifications of riverbed morphology and water pollution have caused some local dramatic declines in their populations. However, recent improvements in terms of water quality and habitat fragmentation allow considering as realistic a rational restocking plan of locally endangered patrimonial fish species such as nase and common barbel. Restocking operations for a conservation purpose have to be based on the knowledge and the use of wild type genetic strains. Therefore, the aim of this study was to characterize the genetic structure and diversity of nase and common barbel populations in South Belgium rivers. Wild common barbels (n = 313) and nases (n = 271) were sampled by electrofishing in respectively 10 and 6 different tributaries from the Meuse and Rhine rivers. Genotyping was performed on 24 microsatellite markers for each species. Preliminary results showed, for both species, a differential genetic clustering between fish originating from the Meuse basin and those originating from the Rhine basin. Detailed analysis describing the genetic structure and diversity of South Belgium populations will be presented and will serve as a management tool to set up a breeding plan for conservation restocking. [less ▲]

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See detailGrossesses prolongées et risques psycho-médicaux
Halin, Stéphanie; Emonts, Patrick ULg; Fohn, Bruno et al

Poster (2014, December)

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See detailComment finir, ou la prière faite au théâtre
Dubouclez, Olivier ULg

in Littérature (2014, December)

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See detailEcological diversity of damselfishes (Pomacentridae) from Moorea
Gajdzik, Laura ULg; Parmentier, Eric ULg; Lepoint, Gilles ULg et al

Poster (2014, December)

The Pomacentridae (damselfishes) represents the 3rd most species-rich coral reef fish family, including 394 species spread worldwide. Recent studies suggested that damselfishes iteratively evolve along ... [more ▼]

The Pomacentridae (damselfishes) represents the 3rd most species-rich coral reef fish family, including 394 species spread worldwide. Recent studies suggested that damselfishes iteratively evolve along three main trophic guilds: “the pelagic feeders” feeding mainly on zooplankton, “the benthic feeders” grazing filamentous algae or biting coral polyps, and an “intermediate” group with species feeding on zooplankton, small benthic invertebrates and algae in variable proportions. Comparing the ecological diversity of damselfish communities among various geographical regions could assess such an iterative radiation. Within this context, the present study is a first attempt exploring the trophic diversity of damselfish community at Moorea Island (French Polynesia). The relationship between the trophic guilds, their habitat diversity and their behavior is evaluated. Habitat and behaviour of 16 damselfish species were described during transects along which different kinds of data were collected. For examples, the location within the reef (e.g. fringing or barrier reef), the depth, the substrate over which fishes are living or the solitary/gregarious habits were recorded. Diet of individuals was investigated by means of stomach content and stable isotopes analyses. Correlations between the dietary preferences and ecological data (habitat and behaviour) are given and the ecological diversity among trophic groups is compared. [less ▲]

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See detailQuasi-loss of nationality - policy recommendations
Wautelet, Patrick ULg; de Groot, Gérard-René

Conference (2014, December)

This presentation gives a summary of the policy recommendations which were drafted in the framework of the ILEC project on loss of nationality (http://www.ilecproject.eu/). The recommendations pertain to ... [more ▼]

This presentation gives a summary of the policy recommendations which were drafted in the framework of the ILEC project on loss of nationality (http://www.ilecproject.eu/). The recommendations pertain to the situation of 'quasi-loss', i.e. the situation in which a person who was assumed to possed a nationality, learns that he/she never has possessed that nationality. The recommendations were presented in a policy brief (available at www.ceps.eu/node/9871). They will be included in Guidelines. [less ▲]

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See detailComparative morphology of cephalic cartilage and statocysts of Mediterranean cephalopods using magnetic resonance imaging (MRI)
Gillet, Amandine ULg; Solé, Marta; Jauniaux, Thierry et al

Conference (2014, December)

Organs responsible for equilibrium of cephalopods, the statocysts, possess numerous similarities with the vestibular systems of vertebrates. The statocysts are embebbed in the cephalic cartilage ... [more ▼]

Organs responsible for equilibrium of cephalopods, the statocysts, possess numerous similarities with the vestibular systems of vertebrates. The statocysts are embebbed in the cephalic cartilage protecting the brain. Although statocysts have been largely described, few studies focused on the cephalic cartilage and its morphology. The aim of this study is to describe the morphology of both statocysts and cartilage, to compare them between different species and to determine which are the parameters influencing their morphology. For species of Decapodiformes (Sepia officinalis, Sepiola rondeletii, Loligo vulgaris and Illex coindetii) and two species of Octopodiformes (Octopus vulgaris and Eledone cirrhosa) have been studied. Cephalic cartilages from these species have been scanned by magnetic resonance imaging (MRI) and volumes and linear measurements have been taken on the 3 dimension reconstructed models of the cartilages and statocysts. Results show that Octopodiformes possess a globular cartilage which surrounds almost totally the brain. On the other hand Decapodiformes posses a cartilage with bigger lateral and anterior foramens and then surrounds a smaller part of the brain. The morphology of the statocysts also varies between the two superorders. The statocysts of Octopodiformes are divided into two parts: endolymph and perilymph while those of Decapodiformes aren’t. These morphological variations between the two groups might be related to their ecology. Eledone cirrhosa and Octopus vulgaris are typically benthic species and then might receive shocks more often than Decapodiformes that possess a more pelagic lifestyle. Octopodiformes might then need a better protection for their brain than Decapodiformes. [less ▲]

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See detailENSO forecast using a wavelet-based mode decomposition
Deliège, Adrien ULg; Nicolay, Samuel ULg; Fettweis, Xavier ULg

Poster (2014, December)

We introduce a new method for forecasting major El Niño/ La Niña events based on a wavelet mode decomposition. This methodology allows us to approximate the ENSO time series with a superposition of three ... [more ▼]

We introduce a new method for forecasting major El Niño/ La Niña events based on a wavelet mode decomposition. This methodology allows us to approximate the ENSO time series with a superposition of three periodic signals corresponding to periods of about 31, 43 and 61 months respectively with time-varying amplitudes. This pseudo-periodic approximation is then extrapolated to give forecasts. While this last one only resolves the large variations in the ENSO time series, three years hindcast as retroactive prediction allows to recover most of the El Niño/ La Niña events of the last 60 years. [less ▲]

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See detailFungal lipase production by solid-state fermentation
Ramos-Sanchez, L.B.; Julian-Ricardo, M.C.; Cordova, J. et al

Conference (2014, December)

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See detailEcology of 20 trace elements in Mytilus galloprovincialis
Richir, Jonathan ULg; Lepoint, Gilles ULg; Lejeune, Pierre et al

Conference (2014, December)

Trace elements (TEs) are considered as non-degradable pollutants. This persistent character can alter their natural biogeochemical balance in contaminated environments. TEs are further toxic for aquatic ... [more ▼]

Trace elements (TEs) are considered as non-degradable pollutants. This persistent character can alter their natural biogeochemical balance in contaminated environments. TEs are further toxic for aquatic organisms from threshold levels and are thus likely to cause multiple damages to the population, the community and the ecosystem levels. For these reasons, their environmental occurrence has to be accurately monitored. The main interest of the use of quantitative sentinel organisms to this end, or bioindicator species, is their capacity to give information on the bioavailability of environmental contaminants. Mussels from the genus Mytilus are particularly well suited organisms for the monitoring of the coastal contamination. Native wild and cultured Mytilus galloprovincialis Lamarck, 1819 have been widely used since around 40 years to this purpose along coasts of the eastern Atlantic and the Mediterranean. But the accurate use of a bioindicator relies on the detailed knowledge of its ecophysiology and the influence of environmental variables on the bioaccumulation processes. In the framework of the STARECAPMED project, the ecology of 20 TEs in M. galloprovincialis is therefore investigated. The mussel morphometry and biology firstly define the TE accumulation processes. Accumulated TE are internally regulated and redistributed between body compartments; these internal processes notably depend on the essential or non-essential character of TEs. As filter feeder, mussels accumulate soluble and suspended TEs whose environmental levels are determined by the geomorphology, the physico-chemistry and the hydrology of monitored coastal meadows. All these factors are acting together to modulate the TE accumulation processes in mussels. TE bioaccumulated levels further balance quickly when any physiological or environmental changes occur in order to reach a new steady-state with environmental TE loads. The ecology of TEs in M. galloprovincialis is thus complex and very dynamic; these considerations must be taken into account when monitoring the chemical contamination of coastal meadows. [less ▲]

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See detailPropriétés métrologiques du Dallas Pain Questionnaire
Marty, M; Genevay, S; Courvoisier, D et al

in Revue du Rhumatisme (2014, December), 81S

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See detailPoster session 5: Friday 5 December 2014, 14:00-18:00Location: Poster area.
Henri, C.; DULGHERU, Raluca Elena ULg; Magne, J. et al

Poster (2014, December)

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See detailConverging to and escaping from the global equilibrium: Isostables and optimal control
Mauroy, Alexandre ULg

in Proceedings of the 53rd IEEE Conference on Decision and Control (2014, December)

This paper studies the optimal control of trajectories converging to or escaping from a stable equilibrium. The control duration is assumed to be short. When the control is turned off, the trajectories ... [more ▼]

This paper studies the optimal control of trajectories converging to or escaping from a stable equilibrium. The control duration is assumed to be short. When the control is turned off, the trajectories have not reached the target and they subsequently evolve according to the free motion dynamics. In this context, we show that the problem can be formulated as a finite-horizon optimal control problem which relies on the notion of isostables. For linear and nonlinear systems, we solve this problem using Pontryagin’s maximum principle and we study the relationship between the optimal solutions and the geometry of the isostables. Finally, optimal strategies for choosing the magnitude and duration of the control are considered. [less ▲]

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See detailValidation d’un questionnaire d’ergonomie cognitive relatif au travail chez des patients atteints de sclerose en plaques
Blavier, Adelaïde ULg; DELRUE, Gaël ULg; HENNEN, Julie et al

Poster (2014, December)

We present datas validating the use of our QUIPSEP questionnaire among multiple sclerosis patients actually employed.

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See detailTaxonomic sufficiency for soft-bottom macrozoobenthos long term study - A case study in corsica
Donnay, Annick ULg; Pelaprat, Corinne; Lejeune, Pierre et al

Poster (2014, December)

Nowadays, the knowledge of the marine ecological quality status of an environment is essential and soft-bottom macrobenthos is one of the indicators used. Studies of soft-bottom macrobenthos are time ... [more ▼]

Nowadays, the knowledge of the marine ecological quality status of an environment is essential and soft-bottom macrobenthos is one of the indicators used. Studies of soft-bottom macrobenthos are time consuming and need expertise for organisms’ identification. Simplifications of these studies are tried and Taxonomic Sufficiency (TS) proposed by Ellis (1985) is one of research axes. For example, some studies highlight that family level identification could be sufficient to identify perturbed area (e.g: Bacci et al., 2009; De-La-Ossa-Carretero et al., 2012; Forde et al., 2013). Nevertheless, identification at species level could be recommended to have more precise information about the existing situation (Ajmal Khan, 2006) or to complete information from others levels (Conde et al., 2013). In Corsican waters where human impacts are less important than in main land waters, we present TS based on STARESO research studies between 2006 and 2012. This work is within the frameworks of the STARE-CAPMED program dedicated to STAtion of Reference and rEsearch on Change of local and global Anthropogenic Pressures on Mediterranean Ecosystem Drifts. After Permanova analysis and Canonical analysis of principal coordinates, eight habitat types have been identified along Corsican coastal water. Their own reference conditions and ecological class boundaries have been evaluated. Those reference conditions and ecological status have been identified for species, genus and family level. A highly significant correlation of calculated values between species and genus levels (R²=0.93) has been determined and a significant correlation between species and family level (R²=0.75). Genus and family levels have a significant Spearman correlation with species level (p<0.05). An application of these reference conditions on the macrobenthos assemblages sampling on 14 stations in spring 2011 and late summer 2012 in Calvi Bay highlights areas with high, good or moderate ecological status. In conclusion, family level is sufficient to follow spatial and/or temporal ecological status. [less ▲]

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See detailAtmosphere - surface fluxes estimated from different measurement techniques over snow covered sea ice
Sørensen, L.L; Delille, Bruno ULg; Jensen, B. et al

Conference (2014, December)

Carbon dioxide flux measurements in ecosystem science are mostly conducted over terrestrial areas by eddy covariance technique or the closed chamber method. Both methods are becoming more frequently used ... [more ▼]

Carbon dioxide flux measurements in ecosystem science are mostly conducted over terrestrial areas by eddy covariance technique or the closed chamber method. Both methods are becoming more frequently used over ice and snow covered surfaces. Comparisons between eddy covariance and chamber methods have been carried out over terrestrial surfaces, but carefully designed inter calibration experiments over sea ice and snow are still needed to assess differences and uncertainties. Here we present one of the first comparisons of fluxes over snow covered sea ice estimated from the eddy covariance technique and the chamber method. The measurements were carried out at Young Sound in Northeast Greenland from May 28th to June 28th 2014 starting just before snow started to melt. The comparison shows in general higher fluxes obtained by the eddy covariance method however the disagreement varies depending on meteorological and surface parameters. The flux divergence in relation to varying parameters will be presented and possible causes will be discussed. [less ▲]

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See detailFacteurs de mauvais pronostic d’une lomboradiculalgie opérée par (micro) discectomie
Demoulin, Christophe ULg; Bavi, F.; DEFAWEUX, Michel ULg et al

in Revue du Rhumatisme (2014, December), 81S

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See detailStigmergy as a mechanism to produce collective vortex behaviours: a study case in shoveler duck
Delcourt, Johann ULg; bode, W. Nikolaï

Poster (2014, December)

Ant mill, caterpillar circle, bat donut, bacteria vortex, duck swirl and fish torus are different names for rotating circular formations of animals, where individuals turn around a common centre. Even if ... [more ▼]

Ant mill, caterpillar circle, bat donut, bacteria vortex, duck swirl and fish torus are different names for rotating circular formations of animals, where individuals turn around a common centre. Even if the ubiquity of this behavioural phenomenon might have suggested common causes or fundamental underlying principles across contexts, a variety of proximate mechanisms can give rise to vortex behaviours. Here, we investigate if stigmergic process (mechanism of self-organisation wit hout direct communication or interaction between individuals) is able to produce different collective behaviours, notably collective vortices. We present an individual-based simulation model for the movement of populations in a resource landscape that allows us to vary the strength of the interactions mentioned above. The key assumption and novelty of our model is that individuals can cause the release of additional nutrients, as well as consuming them. Our model produces clear predictions. For example, we expect more tortuous individual movement paths and higher levels of aggregation in populations occupying homogeneous environments where individual movement makes more nutrients available. We also show how observed movement dynamics could change when local nutrient sources are depleted or when the population density increases. Our predictions are testable and qualitatively reproduce the different feeding behaviours observed in filter-feeding ducks (Anas clypeata), for example. We suggest that considering two-way interactions between feeding individuals and resource landscapes could help to explain fine-scale movement dynamics. [less ▲]

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See detailSchistosoma mansoni egg-induced inflammation inhibits γ-herpesvirus replication
Dougall, Annette ULg; Rolot, Marion ULg; Vanderplasschen, Alain ULg et al

Poster (2014, December)

Geographically, S. mansoni overlaps with human γ-herpesvirus infections such as Kaposi’s sarcoma-associated herpesvirus. The strongly regulated Th2-type immune response generated during infection by S ... [more ▼]

Geographically, S. mansoni overlaps with human γ-herpesvirus infections such as Kaposi’s sarcoma-associated herpesvirus. The strongly regulated Th2-type immune response generated during infection by S. mansoni may jeopardize or improve the host’s ability to generate effective immunity against co-infecting pathogens, such as viruses. Here, we have trialled two approaches using murine herpesvirus-4 (MuHV-4). The first used a S. mansoni egg model to induce lung granulomas followed by intranasal infection with the MuHV-4-luc+ recombinant virus. Alternatively, we naturally infected mice with S. mansoni cercariae to induce a systemic Th2-type response and granulomas in the liver and intestine before intranasal MuHV-4-luc+ infection. We observed in both models a significant reduction of MuHV-4 replication in the lungs at day 5 and 7 pi associated with reduced weight loss caused by MuHV-4 infection. These results indicate that helminth induce Th2-type responses could inhibit and protect against viral infection. [less ▲]

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See detailMotor control and low back pain in elite soccer players
GROSDENT, Stéphanie ULg; Demoulin, Christophe ULg; Namurois, Guy et al

in Abstract Book of 7th Biennial Congress of The Belgian Back Society (2014, December)

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See detailIgE antibodies and FceRI are critical components of protective type 2 immunity against honeybee and russell's viper venom in mice
Starkl, Philipp; Marichal, Thomas ULg; Reber, Laurent L. et al

in Proceedings of the Type 2 Cell Symposium - Brugge (2014, December)

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See detailPoster session 3: Thursday 4 December 2014, 14:00-18:00Location: Poster area.
Gabriels, C.; LANCELLOTTI, Patrizio ULg; Van De Bruaene, A. et al

Poster (2014, December)

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See detailWood digestion in lower termites: multidisciplinary approaches based on differential feeding
Bauwens, Julien ULg; Brasseur, Catherine ULg; Tarayre, Cédric ULg et al

Poster (2014, December)

Termites digestive tract and hindgut especially still holds many secrets despites hundreds of years of research. The complexity of the symbiotic microbial community and the contrast of physio-chemical ... [more ▼]

Termites digestive tract and hindgut especially still holds many secrets despites hundreds of years of research. The complexity of the symbiotic microbial community and the contrast of physio-chemical environments found in lower termites paunch are potentially the key point to explain the efficiency of ligno-cellulose digestion. Contribution of advancing technologies accelerates the progress of our knowledge in this field. Here, we present multiple approaches combining old and recent techniques used to highlight the effect of ligno-cellulosic compounds on termite gut and the role of populations from the symbiotic microbial community. Termites Reticulitermes flavipes (Kollar) submitted to various artificial diets showed variations in flagellates populations profile and enzymatic activities. Differential protein expression was investigated using 2D-DIGE MALDI-TOF-TOF and 2D-LC-MS/MS using high resolution orbitrap analyzer. Results from both proteomic experiments tend to support each-other and bring complementary points of view. The gel-free analysis resulted in highly contrasted identification of enzymes involved in ligno-cellulose digestion and metabolism. Finally, differential feeding experiments leaded to in vivo selection of different symbiotic communities. These communities were characterized following some metabolism assays and allowed the cultivation of diverse microbial consortia using media closely related to the respective artificial diets. This work provides relevant data on termite and associated microbial community response to alimentary diets. [less ▲]

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See detailOn Projection-Based Model Reduction of Biochemical Networks Part II: The Stochastic Case
Sootla, Aivar ULg; Anderson, James

in Proceedings of the 53rd IEEE Conference on Decision and Control (2014, December)

In this paper, we consider the problem of model order reduction of stochastic biochemical networks. In particular, we reduce the order of (the number of equations in) the Linear Noise Approximation of the ... [more ▼]

In this paper, we consider the problem of model order reduction of stochastic biochemical networks. In particular, we reduce the order of (the number of equations in) the Linear Noise Approximation of the Chemical Master Equation, which is often used to describe biochemical networks. In contrast to other biochemical network reduction methods, the presented one is projection-based. Projection-based methods are powerful tools, but the cost of their use is the loss of physical interpretation of the nodes in the network. In order alleviate this drawback, we employ structured projectors, which means that some nodes in the network will keep their physical interpretation. For many models in engineering, finding structured projectors is not always feasible; however, in the context of biochemical networks it is much more likely as the networks are often (almost) monotonic. To summarise, the method can serve as a trade-off between approximation quality and physical interpretation, which is illustrated on numerical examples. [less ▲]

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See detailOn Projection-Based Model Reduction of Biochemical Networks Part I: The Deterministic Case
Sootla, Aivar ULg; Anderson, James

in Proceedings of the 53rd IEEE Conference on Decision and Control (2014, December)

This paper addresses the problem of model reduction for dynamical system models that describe biochemical reaction networks. Inherent in such models are properties such as stability, positivity and ... [more ▼]

This paper addresses the problem of model reduction for dynamical system models that describe biochemical reaction networks. Inherent in such models are properties such as stability, positivity and network structure. Ideally these properties should be preserved by model reduction procedures, although traditional projection based approaches struggle to do this. We propose a projection based model reduction algorithm which uses generalised block diagonal Gramians to preserve structure and positivity. Two algorithms are presented, one provides more accurate reduced order models, the second provides easier to simulate reduced order models. [less ▲]

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See detailPoster session 4: Friday 5 December 2014, 08:30-12:30Location: Poster area.
Uejima, T.; Itatani, K.; Nakatani, S. et al

Poster (2014, December)

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See detailDélires et Hallucinations : Echelle transdiagnostique d’auto-évaluation.
Beaupain, Margaux; Thirion, Julie; Wagener, Aurélie ULg et al

Poster (2014, November 29)

Introduction : Les délires et les hallucinations sont des symptômes majeurs présents chez 80% des personnes souffrant d’un trouble psychotique (e.g., bipolaire, schizophrène). Cependant, ces phénomènes ... [more ▼]

Introduction : Les délires et les hallucinations sont des symptômes majeurs présents chez 80% des personnes souffrant d’un trouble psychotique (e.g., bipolaire, schizophrène). Cependant, ces phénomènes sont également présents dans d’autres troubles psychiatriques (e.g., troubles anxieux, dépression) et chez 8% des individus tout venants (Linscott & Van Os, 2012) suggérant l’importance de les évaluer. D’après la littérature, les populations cliniques et non-cliniques se distinguent d’avantage à travers différentes dimensions telles que la détresse, la conviction et le contenu que par la fréquence (Lincoln, 2007). Cependant, les évaluations existantes se centrent principalement sur la fréquence des phénomènes, ce qui laisse beaucoup d’informations cliniques de côté. De plus, elles ne sont que rarement basées sur une approche en continuum permettant d’appréhender la complexité et l’hétérogénéité des phénomènes (allant des perceptions aberrantes jusqu’aux délires et hallucinations). Enfin, ce sont souvent des hétéroévaluations qui sont chronophages et requièrent du personnel qualifié alors que certaines études suggèrent une bonne validité des autoévaluations de ces phénomènes (Se Hyun et al., 2010). Afin de pallier ces limites, nous avons développé une échelle transdiagnostique d’auto-évaluation des idées délirantes et hallucinations en se basant sur une approche en continuum. Méthode : Une revue de la littérature sur les caractéristiques et outils d’évaluations des idées délirantes et des hallucinations a été réalisée. Vingt-quatre items parmi les plus discriminants ont été sélectionnés et adaptés. Pour chaque item, huit dimensions ont été sélectionnées : fréquence, détresse, interférence, conviction, état de conscience, contenu positif VS négatif, agréabilité et attribution interne VS externe. Les individus répondent d’abord à la fréquence sur une échelle de type Likert en 5 points (« Oui, ça m’arrive souvent » à « Non, ça ne m’est jamais arrivé »). Si la réponse est positive, les sept autres dimensions sont évaluées via une échelle visuelle analogique de 0 à 10. Perspectives: L’échelle est actuellement en cours de validation. Elle sera pré-testée auprès d’étudiants avant d’être validée auprès de populations cliniques et non-cliniques. A long terme, cette échelle transdiagnostique d’auto-évaluation pourrait être utilisée en clinique comme un outil favorisant une meilleure prise en charge de ces symptômes et comme un nouvel outil de recherche. [less ▲]

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See detailPathology. What is found in patients that are referred for further investigations ?
TOMASELLA, Marco ULg

in Abstract Book Neck complaints. A 360° view. (2014, November 29)

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See detailAthanase Kircher ou l’Oedipe des Temps modernes
Winand, Jean ULg

Conference (2014, November 29)

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See detailPerceptions culturelles dans un contexte de néoplasme pédiatrique: Considérations transculturelles entre l’Occident et le Japon
Vander Haegen, Marie ULg; Roskam, Isabelle

Poster (2014, November 29)

INTRODUCTION Toute société humaine construit son héritage collectif sur la transmission de valeurs et de rites permettant aux descendants de réguler leurs schèmes comportementaux, affectifs, sociaux et ... [more ▼]

INTRODUCTION Toute société humaine construit son héritage collectif sur la transmission de valeurs et de rites permettant aux descendants de réguler leurs schèmes comportementaux, affectifs, sociaux et moraux sur base des repères culturels alloués depuis des décennies. Investiguer les balises culturelles et l’appréhension sociétale du néoplasme pédiatrique reste peu développé dans la littérature. Ce champ « anthropo-clinique » prend initialement son essor dans la clinique oncologique adulte où des résultats significatifs montrent un lien entre la culture et la perception du cancer. OBJECTIFS Les objectifs de cette étude sont multiples: (a) étudier l’effet de la culture dans la représentation de la maladie cancéreuse de l’enfant, (b) analyser transculturellement les similitudes et les dissimilitudes entre la culture japonaise et occidentale, et (c) mettre en exergue les diverses implications cliniques pour les professionnels de la santé. METHODE Une revue de littérature est conduite afin de dégager les tendances culturelles dans la politique sanitaire, le service hospitalier, la relation médecin-malade, le concept de douleur, l’environnement familial et la perception de la mort au Japon et en Occident. Le choix s’est porté sur ce pays asiatique par la présence de certains repères culturels intéressants dans le domaine de l’oncologie pédiatrique. RESULTATS (a) Etudier l’effet de la culture dans la représentation de la maladie cancéreuse de l’enfant Les correspondances effectuées ont permis d’entrevoir la situation onco-pédiatrique comme relevant de faits biologiques et de faits culturels. Les paramètres culturels interviennent au sein des nombreuses conceptions et représentations sociales de la maladie cancéreuse d’un enfant. L’ensemble de ces perceptions sociales étant notamment influencées par les valeurs et les truismes véhiculés dans la culture. (b) Analyser transculturellement les similitudes et les dissimilitudes entre la culture japonaise et occidentale. Eléments de similitudes : Il a été noté l’universalité des mécanismes pathogéniques du cancer chez l’enfant et le développement de politiques sanitaires dans la lutte contre le cancer. Eléments de dissimilitudes : A. Le Japon Le système familial japonais et son organisation des soins en cancérologie de l’enfant varient et se teintent de nombreuses coutumes shintoïstes et bouddhistes. Il a été identifié le chaos régnant dans ses familles où des attitudes désengagées existent. L’organisation hospitalière japonaise est décrite comme carencée en réseaux de soutien psychologique pour la mère, très souvent seule face à la maladie de son enfant. Des risques majeurs de dépression, de traits anxieux et d’un stress post-traumatique sont observés. Le médecin japonais dispose d’un pouvoir de décision médicale et sociale, se manifestant notamment par un degré de variabilité dans la communication diagnostique et pronostique envers la famille et l’école d’origine. La situation de soin est variable avec l’inclusion en premier lieu d’une pharmacopée naturelle afin de traiter le cancer et ses effets iatrogènes. Enfin, il subsiste une inhibition du partage social des émotions où, des attitudes de retenue et de silence chez les parents se manifestent durant tout le processus thérapeutique mais aussi en cas de décès de l’enfant. B. L’Occident Les pays occidentaux présentent une appréhension sociale et médicale singulière du cancer pédiatrique. La variabilité observée concerne l’organisation hospitalière et la communication médicale. Le praticien occidental établit une communication médicale ouverte avec l’enfant et sa famille et ce, dès le départ du processus thérapeutique. Le contexte curatif est caractérisé par une forte médication d’opioïdes afin de pallier aux nombreuses douleurs et effets des traitements. L’aménagement hospitalier permet la création de réseaux de soutien psychologique pour l’enfant et sa famille et l’établissement d’activités ludiques.(c) Mettre en exergue les diverses implications cliniques pour les professionnels de la santé L’intention de cette étude est de sensibiliser les professionnels de la santé à la pléiade de facteurs psycho-sociaux intervenant dans un contexte de maladie néoplasique. Éléments qui doivent requérir d’une bienveillance clinique où tant l’enfant traité que son entourage familial, doivent être entendus dans toute leur spécificité d’être humain. DISCUSSION Une stratégie d’action intéressante concernerait une grille de lecture culturelle du patient et de sa famille. Cette grille peut offrir un entendement de la diversité culturelle en psycho-oncologie et peut permettre au professionnel de réajuster finement son travail clinique dans un contexte quotidien de multiculturalité. Cette grille de lecture doit rester simple et proposer un petit nombre de « repères culturels » (items culturels) pour professionnels, leurs permettant d’ajuster certains paramètres cliniques (communication médicale, gestion des émotions, rapport à la mort, etc.). Cette considération ethnologique du patient doit supposer au préalable une formation de compétences dans le domaine de la culture et de la santé/maladie. [less ▲]

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See detailFunctional analysis of FRD3 in Arabidopsis relatives
Scheepers, Maxime ULg; Charlier, Jean-Benoit ULg; Motte, Patrick ULg et al

Poster (2014, November 28)

Transcriptomic studies identified genes which are constitutively over-expressed in A. halleri compared to A. thaliana and which may have a role in metal tolerance or accumulation (1-3). A candidate gene ... [more ▼]

Transcriptomic studies identified genes which are constitutively over-expressed in A. halleri compared to A. thaliana and which may have a role in metal tolerance or accumulation (1-3). A candidate gene encodes FRD3, a member of the MATE family of membrane transporters (56 members in A. thaliana). It is a citrate transporter involved in iron homeostasis (4-6) and playing a role in zinc tolerance in A. thaliana (7). We are aiming to analyse the FRD3 high expression in A. halleri and the FRD3 function in zinc and iron homeostasis in A. thaliana. [less ▲]

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See detailThe Beginning of UP in Northern Mongolia: New Results and Perspectives from the Open-air Site of Tolbor 16
Zwyns, N.; Bolorbat, T.; Flas, Damien ULg et al

Conference (2014, November 28)

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See detailGuidance chez les professionnels de la voix
Remacle, Angélique ULg

Conference (2014, November 28)

Cet atelier s’intéresse aux locuteurs professionnels, soit les personnes qui ne peuvent se passer de leur voix dans le cadre de leur travail, par exemple les enseignants et les chanteurs. Outre la ... [more ▼]

Cet atelier s’intéresse aux locuteurs professionnels, soit les personnes qui ne peuvent se passer de leur voix dans le cadre de leur travail, par exemple les enseignants et les chanteurs. Outre la présentation de pistes relatives à la prévention et la prise en charge de cette population, l’atelier comporte des manipulations d'accumulateurs vocaux, y compris l'utilisation du feedback tactile dans le but de modifier le comportement vocal (contrôle de la fréquence et du niveau de pression sonore de la voix). Des moyens permettant de réduire la charge vocale et le bruit environnant sont également présentés et manipulés : système d’amplification vocale et traqueur de bruit. [less ▲]

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See detailEvaluation de la fatigue musculaire des membres supérieurs
Forthomme, Bénédicte ULg; Kaux, Jean-François ULg; Crielaard, Jean-Michel ULg et al

in Abstract Book des XVIèmes Rencontres isocinétiques de Médimex (2014, November 28)

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See detailEstimating Ventricular Stroke Work from Aortic Pressure Waveform
Kamoi, Shun; Pretty, Christopher; Chiew, Yeong Shiong et al

Poster (2014, November 28)

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See detailLes accumulateurs de voix
Remacle, Angélique ULg

Conference (2014, November 28)

Les troubles de la voix peuvent être engendrés tant par un malmenage que par un surmenage vocal. Tandis que le malmenage est causé par un geste vocal inadéquat, le surmenage résulte d’une charge vocale ... [more ▼]

Les troubles de la voix peuvent être engendrés tant par un malmenage que par un surmenage vocal. Tandis que le malmenage est causé par un geste vocal inadéquat, le surmenage résulte d’une charge vocale supérieure aux capacités de récupération du locuteur. La charge dépend principalement de la quantité de phonation en termes de durée, de fréquence fondamentale et de niveau de pression sonore de la voix. Ainsi, parler longtemps, fort et avec une voix aigüe peut mener au surmenage, principalement lorsque les conditions environnementales sont défavorables (mauvaise acoustique, bruit ambiant élevé, atmosphère sèche, etc). Depuis quelques années, des systèmes portables de quantification de la charge vocale sont commercialisés. Ces accumulateurs (ou dosimètres) objectivent le comportement vocal en situation réelle pendant une durée prolongée. Ils permettent de déterminer les moments auxquels le sujet parle, la durée de phonation, la fréquence fondamentale et le niveau de pression sonore de la voix. Certains modèles fournissent également des mesures du bruit environnant. Actuellement, les accumulateurs sont principalement utilisés chez les locuteurs professionnels, soit les personnes qui ne peuvent se passer de leur voix dans le cadre de leur travail, par exemple les enseignants et les chanteurs. La dosimétrie vocale permet de cibler les comportements vocaux à risque en contexte écologique ainsi que les situations favorisant la dysphonie. L’objectif des recherches utilisant ces outils est de proposer des lignes de conduites pour la prévention, l’évaluation et le traitement de la dysphonie, principalement chez les personnes ayant un usage vocal intensif. Aussi, ces recherches tentent d’établir des normes relatives à l’utilisation vocale journalière de différents groupes d’individus. En rééducation, les accumulateurs de voix peuvent également fournir un feedback vibratoire en temps réel lorsque des seuils d’intensité ou de fréquence, prédéfinis par l’expérimentateur avant l’usage, sont dépassés par le locuteur. [less ▲]

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See detailQuels modèles pour soutenir la prévention et la promotion de la santé ?
Vanmeerbeek, Marc ULg; Mathonet, Julien; Miermans, Marie-Christine ULg et al

Conference (2014, November 28)

Contexte et objectifs La prévention n’atteint pas souvent son objectif d’accès universel aux soins préventifs. Les modèles opérationnels publiés concernant la prévention et la promotion de la santé en ... [more ▼]

Contexte et objectifs La prévention n’atteint pas souvent son objectif d’accès universel aux soins préventifs. Les modèles opérationnels publiés concernant la prévention et la promotion de la santé en soins primaires ont été recherchés pour réaliser un inventaire fonctionnel et formuler des hypothèses de travail sur l’efficacité et l’équité de la prévention. Méthode Revue narrative de littérature utilisant les mots-clés relatifs aux différents niveaux de prévention, à la promotion de la santé, aux soins primaires, aux modèles de pratique et à la délivrance de soins. Une analyse multicritères a été utilisée. Principaux résultats Douze modèles ont été sélectionnés. Les modèles dont les auteurs annoncent qu’ils s’appliquent à la prévention décrivent majoritairement des approches centrées sur les individus dans le cadre de la relation médecin-patient, prenant en compte l’organisation de pratique. Certains modèles systémiques de type socio-écologique illustrent le concept de promotion de la santé : pratique éducative, ciblage sur des groupes ou des populations, prise en compte des milieux de vie et des déterminants sociaux de la santé. La place des patients dans l’élaboration des modèles est mineure, à l’image de leur implication comme acteurs dans les systèmes de soins. Les définitions des termes de prévention, promotion de la santé et éducation du patient diffèrent considérablement d’un modèle à l’autre. Discussion et conclusion Certains éléments valorisés par la promotion de la santé seraient intégrables aux pratiques de soins : empowerment individuel des patients, prise en compte de leurs milieux de vie ; participation accrue à des réseaux locaux de professionnels de la santé ; intégration, au sein des mêmes structures, de l’approche individuelle et collective pour permettre la poursuite simultanée des objectifs de personnalisation, d’efficacité et d’équité. Ces évolutions ont des implications sur la formation des soignants, en termes d’aptitudes communicationnelles, de sensibilisation aux concepts de la santé publique et d’immersion précoce des futurs soignants dans la communauté. [less ▲]

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See detailTracking stressed blood volume during vascular filling experiments
Pironet, Antoine ULg; Dauby, Pierre ULg; Chase, J. Geoffrey et al

in 13th Belgian Day on Biomedical Engineering (2014, November 28)

A three-chamber cardiovascular system model is used to compute stressed blood volume from filling experiments. As previously observed, stressed blood volume is a good predictor of the change in cardiac ... [more ▼]

A three-chamber cardiovascular system model is used to compute stressed blood volume from filling experiments. As previously observed, stressed blood volume is a good predictor of the change in cardiac output after fluid infusion. [less ▲]

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See detailTracking stressed blood volume during vascular filling experiments
Pironet, Antoine ULg; Dauby, Pierre ULg; Chase, J. Geoffrey et al

Poster (2014, November 28)

A three-chamber cardiovascular system model is used to compute stressed blood volume from filling experiments. As previously observed, stressed blood volume is a good predictor of the change in cardiac ... [more ▼]

A three-chamber cardiovascular system model is used to compute stressed blood volume from filling experiments. As previously observed, stressed blood volume is a good predictor of the change in cardiac output after fluid infusion. [less ▲]

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See detailEstimating Ventricular Stroke Work from Aortic Pressure Waveform
Kamoi, Shun; Pretty, Christopher; Chiew, Yeong Shiong et al

in 13th Belgian Day on Biomedical Engineering (2014, November 28)

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See detailIsocinétisme et tendinopathies
Croisier, Jean-Louis ULg; Kaux, Jean-François ULg; Crielaard, Jean-Michel ULg et al

in Abstract Book des XVIèmes Rencontres isocinétiques de Médimex (2014, November 28)

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See detailHow light and occupational therapy intervention could fight some psychogeriatric symptoms
Maggi, Patrick ULg; Bassain, Fatima; Gosset, Christiane ULg et al

Conference (2014, November 27)

Purpose: Aggregated results of systematic reviews separately show how light used as a treatment and some occupational therapy interventions could have a positive impact on psychobehavioural disorders in ... [more ▼]

Purpose: Aggregated results of systematic reviews separately show how light used as a treatment and some occupational therapy interventions could have a positive impact on psychobehavioural disorders in older people. Since the beginning of June 2014 the Walloon Government has been financing a project which consists of a non-pharmacological approach that combines light and occupational therapy for a psychogeriatric population with specific symptoms: spatial and temporal disorientations, apathy, depression, agitation, anxiety, confusion and circadian disorder. The objective of this abstract is to expose the assumptions that the combination of two different light devices and one specific occupational therapy program could have an impact on the different symptoms of a psychogeriatric population. Methods: To build our hypothesis, two literature reviews have been achieved. The first one concerning the use of light as therapy gathered 30 studies while the other one about occupational therapy activities collected 35 articles. Results: Despite of a heterogeneity between studies dealing with light and occupational therapy, the combination of these two non-pharmacological interventions might fight the depressive syndrome, reduce the temporal disorientation thanks to a regularity in the period of activity, restore the circadian rhythm and so reduce some troubles that can be linked to them: sleep disorder, risk of fall, apathy, agitation, behavioural and cognitive troubles (attention, concentration). Moreover, one of the two light devices used which can modulate the light intensity according to the rooms might reduce the spatial disorientation if it’s employed as a landmark. Conclusions: Based on literature reviews and our experience into this field it’s seems that a non-pharmacological approach involving light and occupational therapy intervention could have a positive effect on symptoms of psychogeriatric population. In admitting that those effects are becoming true after experimentation and analyses, we can also expect an improvement of the quality of life. [less ▲]

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See detailPPP in the field of employment: clandestine strategies to become an efficient PPP?
Remy, Céline ULg

Conference (2014, November 27)

In this article, we study the Public-Private Partnerships (PPP) in the field of employment, in Belgium. These PPPs are established between Public Employment Service (PES) and private operators to create ... [more ▼]

In this article, we study the Public-Private Partnerships (PPP) in the field of employment, in Belgium. These PPPs are established between Public Employment Service (PES) and private operators to create projects for support and training for jobseekers the ultimate goal of which is social and professional reintegration. There are three critical moments in the life of the partnership: getting a partnership agreement with the PES, mobilizing jobseekers to participate in the delivery, and evaluating the outcomes achieved by the operator. The parties affected by these three critical steps are mainly the private operators. To overcome these difficulties, the providers implement informal and "clandestine" strategies to ensure the proper operation of the partnership and especially its performance and sustainability. [less ▲]

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See detailL’animation théâtrale comme présence sociale
Brahy, Rachel ULg

Conference (2014, November 27)

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See detailLa sociologie par la littérature : une approche transdisciplinaire
Ledent, David ULg

Conference (2014, November 27)

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See detailDiscussant Panel on "Public-Private Partnerships: New Governance Arrangements"
Remy, Céline ULg

Conference (2014, November 27)

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See detailRole of the polyQ length and non-polyQ regions during the aggregation process into amyloid fibrils of model polyQ proteins
Huynen, Céline ULg; Willet, Nicolas ULg; Buell, Alexander K et al

Poster (2014, November 26)

Nine neurodegenerative disorders, referred to as polyglutamine diseases and including Huntington’s disease, are associated with the abnormal expansion of a polyglutamine tract inside nine unrelated ... [more ▼]

Nine neurodegenerative disorders, referred to as polyglutamine diseases and including Huntington’s disease, are associated with the abnormal expansion of a polyglutamine tract inside nine unrelated proteins. This polyQ expansion is thought to be the major determinant in the development of neurotoxicity, triggering protein aggregation into amyloid fibrils. A large body of evidence however suggests that non-polyQ regions modulate the aggregation process triggered by polyQ expansions. The interplay between the polyQ tract and non-polyQ regions is complex and still not fully understood. In order to better understand it, we previously designed and characterized model polyQ proteins made of the beta-lactamase BlaP with 23, 30, 55 and 79Q inserted at position 197 or 216. Our first results had indicated that our model is relevant to study polyQ aggregation since it recapitulates the aggregation properties of polyQ disease-associated proteins: there is a Q-threshold for the spontaneous formation of amyloid fibrils in solution, and above the threshold, the longer the polyQ, the faster the aggregation. Moreover, the structure of BlaP and the position of insertion of the polyQ tract influence their aggregation properties in solution. This work aims to better understand, at the molecular level, (i) the precise role of the polyQ length (23, 30, 55, 61, 67, 73 and 79Q), (ii) the conformation of the host protein (native or unfolded BlaP), (iii) the location of the polyQ tract within BlaP (197 or 216), (iv) the flexibility of the polyQ flanking sequences, and (v) the origin of constraints applied by BlaP to the inserted polyQ tract (at its N- or C-terminal end) on the structural, thermodynamic and aggregation properties of BlaP-polyQ chimeras, using a wide range of biophysical techniques (e.g., spectroscopy methods, quartz crystal microbalance, atomic force microscopy and dynamic light scattering). The effect on the aggregation properties will be determined on the spontaneous aggregation into amyloid fibrils in solution, and on the nucleation and on the elongation steps of amyloid fibril formation. For this purpose, new chimeras containing 61, 67 and 73Q at position 197, or 55Q inserted at position 197 in between two different protease’s cleavage sites, that are relatively flexible, will be moreover created. Our results first demonstrate that the spontaneous aggregation into amyloid fibrils in solution is correlated to the polyQ length with an exponential growth function, and that the elongation rate is linearly correlated to the polyQ length, independently of the protein context (i.e., conformation of BlaP, and/or location of the polyQ tract, and/or polyQ peptides inserted or not within BlaP). However, the location of the polyQ tract inside BlaP, and/or its conformational state, and/or the flexibility of polyQ flanking sequences, and/or the origin of constraints applied to the polyQ tract drastically influence the ability of a polyQ tract to trigger the nucleation and/or the elongation step of amyloid fibrils (variation in the Q-threshold and in the absolute rate of both steps). Altogether, our results suggest that non-polyQ regions constitute an additional potential therapeutic target, more specific than drugs targeting the polyQ sequence, to interfere with the nucleation and/or the elongation of amyloid fibrils, associated to neurotoxicity. A possible drug could be constituted by a ligand specific to non-polyQ regions of disease-associated proteins, which further increases the constraints applied to the polyQ expansion to prevent the disease onset and/or progression. [less ▲]

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See detailAllergies alimentaires
GADISSEUR, Romy ULg

Conference (2014, November 26)

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See detailIn vitro hemocompatibility assessment of Near-IR-Emitting Ag2S Quantum Dots (QD)
Grandfils, Christian ULg; Hocaoglu, I.; Demir, F. et al

in Proceeding of the Nanobiotechnology International Workshop (2014, November 26)

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See detailGuides d'architecture moderne et contemporaine en Wallonie et à Bruxelles
Charlier, Sébastien ULg; Moor, Thomas

Conference (2014, November 25)

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See detailProgramming self assembly by designing the 3D shape of floating objects
Poty, Martin ULg; Lagubeau, Guillaume ULg; Lumay, Geoffroy ULg et al

Conference (2014, November 25)

Self-assembly of floating particles driven by capillary forces at some liquid-air interface leads to the formation of two-dimensionnal structures. Using a 3d printer, milimeter scale objets are produced ... [more ▼]

Self-assembly of floating particles driven by capillary forces at some liquid-air interface leads to the formation of two-dimensionnal structures. Using a 3d printer, milimeter scale objets are produced. Their 3d shape is chosen in order to create capillary multipoles. The capillary interactions between these components can be either attractive or repulsive depending on the interface local deformations along the liquid-air interface. In order to understand how the shape of an object deforms the interface, we developed an original profilometry method. The measurements show that specific structures can be programmed by selecting the 3d branched shapes. [less ▲]

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See detailUse of 13C-NMR in structural elucidation of polysaccharides: case of locust bean gum
Gillet, Sébastien ULg; Aguedo, Mario ULg; Blecker, Christophe ULg et al

Poster (2014, November 25)

Locust bean gum (LBG) galactomannans are polysaccharides consisting of a β-(1→4) D-mannopyranosyl backbone substituted to varying degrees in α-(1→6) with single D-galactopyranosyl residues. This basic ... [more ▼]

Locust bean gum (LBG) galactomannans are polysaccharides consisting of a β-(1→4) D-mannopyranosyl backbone substituted to varying degrees in α-(1→6) with single D-galactopyranosyl residues. This basic structure is the same for all galactomannans (Fig. 2). However, when locust bean gum is extracted at different temperatures, the generated fractions exhibit different properties in aqueous solution (viscosity, viscoelasticity, gel formation, thermohydrolysis resistance, etc.). This means that there are differences within the fine structure of the polymers (although the basic structure is the same). Analysis of [13C]-NMR spectra of galactomannans, in combination with other techniques, can provide capital information about fine structural elucidation of the polymers. The method specifies the distribution of lateral galactosyls along the main chain of mannans. Two fractions extracted from locust bean gum at 25 and 80 °C (respectively GM25 and GM80) were comparatively studied by [13C]-NMR. Mannosyls/Galactosyls (M/G) ratios can be determined by considering the intensities of C-1 mannose and galactose signals in [13C]-NMR spectra. This method provides results relatively close to those obtained by GC-MS analysis. Spectra also showed that resonance from C4 of D-mannose residues were split, in evident dependence upon the nearest-neighbor probabilities (“diad frequencies”) of D-galactosyl groups along the mannan chains (Fig. 2). Diad frequencies were obtained by integrating C4(Man) peak areas. F11, F21/F12 and F22 gave respectively the di-, mono- or non-substituted mannose pairs proportions. High percentages of F11 and F22 therefore indicate a more non-homogeneous distribution of lateral galactosyls along the polysaccharide backbone as observed for GM80. The percentages of total lateral substituents obtained by C4(Man) peak analysis [F11 + (F21 or F12)/2] were fairly well correlated with M/G ratios. Splitting of the C-6 substituted D-mannose resonance provides, therefore the basis for determining the next-nearest-neighbor probabilities (triad frequencies) (Fig. 2). However, the spectrum is often not sufficiently resolved to accurately quantify and interpret the results. [less ▲]

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See detailRemote control of self-assembled microswimmers
Vandewalle, Nicolas ULg; Grosjean, Galien ULg; Darras, alexis et al

Conference (2014, November 24)

Physics governing the locomotion of microorganisms and other microsystems is dominated by viscous damping. An effective swimming strategy involves the non-reciprocal and periodic deformations of the ... [more ▼]

Physics governing the locomotion of microorganisms and other microsystems is dominated by viscous damping. An effective swimming strategy involves the non-reciprocal and periodic deformations of the considered body. Herein, we show that a magnetocapillary-driven self-assembly, composed of three soft-ferromagnetic beads, is able to swim along a liquid-air interface when driven by an external magnetic field. Moreover, the system can be fully controled, opening ways to explore low Reynolds number swimming and to create micromanipulators in various applications. [less ▲]

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See detailConnectivité trophique entre deux écosystèmes: le cas des litières de laminaires et des substrats meubles côtiers
Vandenbosch, François; Dauby, Patrick ULg; Lepoint, Gilles ULg et al

Conference (2014, November 24)

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See detailPrototype SOLAP appliqué sur des champs continus en mode raster. Analyse de hot spots de criminalité.
Kasprzyk, Jean-Paul ULg

Conference (2014, November 24)

SOLAP (Spatial OnLine Analytical Processing) is a server which allows decision makers to quickly analyze archived data from a spatial datawarehouse. Until now, most of SOLAP tools only manage spatial data ... [more ▼]

SOLAP (Spatial OnLine Analytical Processing) is a server which allows decision makers to quickly analyze archived data from a spatial datawarehouse. Until now, most of SOLAP tools only manage spatial data through the vector mode. However, some visualization techniques use interpolation to transform them into continuous fields in raster mode. Crime hotspot mapping is one of them: data are modeled in raster with a KDE (Kernel Density Estimation) algorithm to offer a spatially continuous visualization of crimes. This research aims at combining hotspot mapping and SOLAP. First, we adapt SOLAP to continuous fields with a raster multidimensional data model. Then the raster model is adapted to KDE. The data model is validated with a prototype including London crime data. [less ▲]

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See detailA lasso penalization approach to differential item functioning
Magis, David ULg

Conference (2014, November 24)

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See detailPENSANDO LA CIUDAD SOSTENIBLE MÁS ALLÁ DE LA DICOTOMÍA ECOLOGÍA URBANA Y MEDIOAMBIENTE URBANO: EL CASO DE LA GOBERNANZA DEL AGUA EN COCHABAMBA
Cabrera Quispe, Juan Edson ULg; Farah, Jihad ULg

Conference (2014, November 24)

In this article, we go back on two ways of taking into account the environmental dimension in urban planning and governance. We stress the difficult articulation between these two approaches – “urban ... [more ▼]

In this article, we go back on two ways of taking into account the environmental dimension in urban planning and governance. We stress the difficult articulation between these two approaches – “urban ecology” and “urban environment” – and the actual impasse the discipline of urban planning finds itself in in its quest of the sustainable city. These two approaches for acting on the city by considering the complexity of its milieu build on different representations of this milieu and different modes of action legitimation. Negating each other, they can difficultly coexist, even less articulate. Through the example of water management in Cochabamba, we stress the tensions between these approaches. We point also to the awkward and marginalized position of urban planning and challenges it must face to regain a capacity of action in contemporary fragmented cities that know complex governance landscapes and rare or endangered resources. [less ▲]

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See detailInteractions between particles in a magnetocapillary self-assembly
Lagubeau, Guillaume ULg; Darras, Alexis; Grosjean, Galien ULg et al

Conference (2014, November 24)

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See detailImpact of steam explosion treatment on chemical configuration of Tall Fescue lignin : structural elucidation using NMR spectroscopy
Maniet, Guillaume ULg; Jacquet, Nicolas ULg; Gillet, Sébastien ULg et al

Poster (2014, November 24)

In the economic and energy context of our society, it is universally recognized that alternatives to petrochemicals products must be found. To overcome this problem, renewable lignocellulosic biomass ... [more ▼]

In the economic and energy context of our society, it is universally recognized that alternatives to petrochemicals products must be found. To overcome this problem, renewable lignocellulosic biomass could be used to produce high value products. To achieve this objective, pretreatment processes are required to allow the breakdown of lignocellulosic structure and increase accessibility of the material. In this way, steam explosion is a thermo-mechano-chemical pretreatment which allows the opening of lignocellulosic material structural components and includes modifications of the physical properties of the material, hydrolysis of hemicellulosic components and modification of the chemical structure of lignin [1]. This study is focused on the impact of various steam explosion treatments on the chemical configuration of tall fescue lignin. NMR analyses perform on the Festuca L. pretreated samples show variations of links with treatment intensity. Observations show double phenomen :re-polymerization and depolymerization of the lignin structure during steam explosion process [2]. In parallel, HPSEC analyses show modifications in the molecular weight of the lignin obtained after the steam explosion treatment. [less ▲]

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See detailA capillary Archimedes’ screw
Darbois-Texier, Baptiste ULg; Dorbolo, Stéphane ULg

Conference (2014, November 23)

As used by Egyptians for irrigation and reported by Archimedes, a screw turning inside a hollow pipe can pull out a fluid againt gravity. At a centimetric scale, an analagous system can be found with a ... [more ▼]

As used by Egyptians for irrigation and reported by Archimedes, a screw turning inside a hollow pipe can pull out a fluid againt gravity. At a centimetric scale, an analagous system can be found with a drop pending on a rotating spiral which is tilted toward the horizontal. The ascent of the drop to the top of the spiral is considered and a theoretical model based on geometrical considerations is proposed. The climb of the drop is limited by the fluid deposition on the screw at high capillary number and by a centrifugation phenomenon. We find out the range of fluid proprities and spiral characteristics for which an ascending motion of the drop is possible. Finally we discuss the efficiency of such system to extract a fluid from a bath at a centrimetric scale. [less ▲]

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See detailL'ECMO, Témoignage de deux infirmiers
KOCH, Jean-Noël ULg; BODSON, Sébastien ULg

Conference (2014, November 22)

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See detailFoucault et Deleuze et Sami-Ali : postmodernité et psychothérapie.
Englebert, Jérôme ULg

Conference (2014, November 22)

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See detailSpécificités syntaxiques des types de discours dans les Quatre Livres des Rois (12e s.)
Mazziotta, Nicolas ULg; Glikman, Julie

Conference (2014, November 21)

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See detailOn the finiteness and uniqueness of the weighted likelihood estimator of ability in polytomous IRT models
Magis, David ULg; Verhelst, Norman

Conference (2014, November 21)

In item response theory (IRT), the weighted likelihood (WL) estimator has become a central method to estimate ability levels of respondents. Primarily introduced with dichotomous IRT models (Warm, 1989 ... [more ▼]

In item response theory (IRT), the weighted likelihood (WL) estimator has become a central method to estimate ability levels of respondents. Primarily introduced with dichotomous IRT models (Warm, 1989), it was later extended to polytomous IRT models (Samejima, 1998). However, very few information is available about the behavior of the WL estimator, and especially about the uniqueness of the ability estimates as well as their finiteness. The purpose of this talk is to establish that with polytomous item response models, the WL estimator of ability always returns finite values. This result is valid for the class of difference models and divide-by-total models, independently of the number of items and the response patterns. However, such estimates may not necessarily be unique, as the WL solving equation may provide several optimal values. Some examples are considered to illustrate both findings. [less ▲]

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See detailHow does gender socialisation influence teenagers' behaviors ? : Contribution of ISRD-2 and ISRD-3 to this question
Gavray, Claire ULg

Conference (2014, November 21)

In both gender groups, young people entering the spiral of violence negatively often react against personal insecurity, against a hostile and little promising environment. But those environments still ... [more ▼]

In both gender groups, young people entering the spiral of violence negatively often react against personal insecurity, against a hostile and little promising environment. But those environments still differ between girls and boys according to the sphere which remains the most valorized, 'suitable' for them (public and competitive sphere for the boys, family and emotional sphere for the girls). ISRD data allow to show links between, on one side, the production of not authorized and violent behaviors and, on the other side, gendered concrete life, gendered attitudes and values. The theory of the societal vulnerability (Walgrave, Vettenburg) and the theory of recognition (Honneth) are confirmed. [less ▲]

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See detailSolar Wind Interaction with the Magnetosphere of Jupiter : Impact on the Magnetopause and the Aurorae
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2014, November 20)

The outcome of the interaction between the solar wind and the Jovian magnetic field bears many differences compared to the Earth's case. At Earth, the solar wind is the major particle and energy source in ... [more ▼]

The outcome of the interaction between the solar wind and the Jovian magnetic field bears many differences compared to the Earth's case. At Earth, the solar wind is the major particle and energy source in the magnetosphere. At Jupiter, the tremendous volcanism on the moon Io is the main plasma source and Jupiter's rapid rotation (relative to its size) is the main energy source for the particles populating its magnetosphere. Combined with a weaker solar wind pressure and a larger Alfvén Mach number as the distance from the Sun increases, all these parameters modify the relative importance of large scale Dungey reconnection and viscous interaction at the magnetopause. In order to study these differences, here we present a statistical analysis of magnetopause waves and flux tube event on the Jovian magnetopause, based on in-situ measurement from the spacecraft that flew-by or orbited around Jupiter. Moreover, variations of the solar wind have significant impact on the Jovian magnetospheric current systems and such changes reflect on the aurora. In this presentation, we will also review the recent findings concerning the aurora at Jupiter and their relationship with the solar wind. [less ▲]

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See detailOn the Use of Principal Component Analysis for Parameter Identification and Damage Detection in Structures
Golinval, Jean-Claude ULg

Conference (2014, November 20)

Modal analysis is used extensively for understanding the dynamic behaviour of structures as well as for structural health monitoring or damage detection based on output-only measurements. In this ... [more ▼]

Modal analysis is used extensively for understanding the dynamic behaviour of structures as well as for structural health monitoring or damage detection based on output-only measurements. In this presentation, a different approach based on principal component analysis is considered. Principal component analysis (PCA), also called proper orthogonal decomposition (POD), is a multi-variate statistical method that aims at obtaining a compact representation of the data. In the present paper, PCA (POD) is used for three purposes, namely damage detection, structural health monitoring and identification of nonlinear parameters. The key idea of PCA is to reduce a large number of measured data to a much smaller number of uncorrelated variables while retaining as much as possible of the variation in the original data. To this purpose, an orthogonal transformation to the basis of the eigenvectors of the sample covariance matrix is performed, and the data are projected onto the subspace spanned by the eigenvectors corresponding to the largest eigenvalues. This transformation has the property to decorrelate the signal components and to maximize variance. The first problem to which PCA is applied here is the damage detection problem. When applied to vibration measurements, it can be shown that the basis of eigenvectors (called the proper orthogonal modes) span the same subspace as the mode-shape vectors of the monitored structure. Thus the damage detection problem may be solved using the concept of subspace angle between a reference subspace spanned by the eigenvectors of the initial (undamaged) structure and the subspace spanned by the eigenvectors of the current (possibly damaged) structure. The second problem concerns structural health monitoring of civil engineering structures when environmental effects (e.g. the influence of the variation of the ambient temperature) have to be removed from the structural changes. In this case, PCA may be applied on identified modal features (e.g. the natural frequencies) to separate the changes due to environmental variations from the changes due to damage sources. This procedure is illustrated on the example of a real bridge located in Luxembourg. The third problem is related to the estimation of nonlinear parameters using model updating techniques. In this case, the most interesting property of PCA is that it minimizes the average squared distance between the original signal and its reduced linear representation. When applied to nonlinear problems, PCA gives the optimal approximating linear manifold in the configuration space represented by the data. The linear nature of the method is appealing because the theory of linear operators is still available. However, it should be borne in mind that it also exhibits its major limitation when the data lie on a nonlinear manifold. [less ▲]

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See detailBoolean Functions for Classification: Logical Analysis of Data
Crama, Yves ULg

Conference (2014, November 20)

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See detailTraitements conservateurs de la gonarthrose
Kaux, Jean-François ULg

Conference (2014, November 20)

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See detailA Debate on Responsible Research and Innovation
Van Oudheusden, Michiel ULg

Conference (2014, November 20)

In the space of just a few years the concept of Responsible Research and Innovation (RRI), or in Dutch Maatschappelijk verantwoord innoveren (MVI), has gained considerable ground: NWO has an MVI-program ... [more ▼]

In the space of just a few years the concept of Responsible Research and Innovation (RRI), or in Dutch Maatschappelijk verantwoord innoveren (MVI), has gained considerable ground: NWO has an MVI-program that has so far funded three rounds of research proposals; Horizon 2020 regularly refers to RRI; and there is now a new journal devoted to RRI. In this panel we focus on the following questions: • How could the concept become so popular in such a relatively short time? • What, if anything, is new in RRI, when we compare it to e.g. CTA, participatory TA, Public Engagement, etc? • If we want to make research and innovation more responsible and responsive to society’s needs, what are the opportunities and obstacles? • What are the conditions for successful mainstreaming of RRI? Panel members Frank Kupper (Athena Institute) Hub Zwart (Centre for Society and the Life Scences), Michiel van Oudheusden (author of a dissertation on Flemish RRI initiatives), and Tsjalling Swierstra (co-founder of the Journal for RI) share their thoughts with colleagues in the audience. [less ▲]

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See detailSpatial Analysis of GNSS Measurements from an Equatorial Ionospheric Scintillation Monitoring Receiver (ISMR) Network
Lonchay, Matthieu ULg; Wautelet, Gilles ULg; Cornet, Yves ULg et al

Conference (2014, November 19)

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

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and diffraction effects. In particular, small-scale ionospheric irregularities generated by different physical processes may cause scattering effects on GNSS signals, producing rapid fluctuations of the signal phase and amplitude as a result. Such scintillations of GNSS signals are responsible for critical consequences regarding applications, such as precise positioning, due to many resulting effects: cycle slips, signal power fading, receiver loss of lock and poor resulting satellite geometry. Ionospheric Scintillation Monitoring Receivers collect high-rate GNSS data. Specific scintillation parameters, such as the well-known S4 and Phi60 indices, are built on high-rate measurements performed on GNSS signals and provide additional information to characterize the intensity of such an event occurring at a specific geographic location at a given time. Spatial Statistics belong to the field of Spatial Analysis, Geography and GIS (Geographic Information System). This discipline allows to perform analyses of data which are localised in space. Ionospheric Scintillation observations achieved by ISMR stations can be characterized by a set of attributes (S4, Phi60, Rate of TEC, etc.) including also the geographic location of their respective Ionospheric Pierce Point (IPP). By combining the simultaneous Multi-GNSS ISMR measurements from a network of ISMR stations, we can obtain a spatially denser data set, able to support spatial statistics tests. The idea of our research is to provide a spatio-temporal analysis of ionospheric scintillation events over Equatorial regions by applying spatial statistics on ISMR Multi-GNSS measurements. In particular, by using spatial statistics, we aim to resolve specific issues regarding ionospheric scintillation data from an ISMR network established in Brazil. The research consists in spatially describing the data set, detecting and measuring potential spatial autocorrelation, determining the scale of the spatial dependency and finally producing an interpolated scintillation sky map at a given time. In terms of applicability of the methodology, our research project consists in exploiting the spatio-temporal analysis performed on ionospheric scintillation data in order to improve the performances and the reliability of Absolute GNSS Positioning algorithms under moderate ionospheric scintillation conditions. By assessing correlations existing between specific ISMR data and classic GNSS observations, the method could be extended to a more general usage which would be independent of ISMR measurements. [less ▲]

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See detailGravitational lensing search for dark matter halos
Biernaux, Judith ULg

Conference (2014, November 19)

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See detailThe physical education teacher as a physical activity promoter: Current developments
Cloes, Marc ULg

Conference (2014, November 19)

The physical education teacher is considered as a cornerstone of the physical activity promotion in the schools. This presentation proposes answers to three questions: (1) Why to promote physical activity ... [more ▼]

The physical education teacher is considered as a cornerstone of the physical activity promotion in the schools. This presentation proposes answers to three questions: (1) Why to promote physical activity at school? (2) Why the PE teacher should play a central role? (3) How the PE teacher could play such role? In conclusion, it is important to remember that (1) PE teachers should become the cornerstones of the PA promotion at school; (2) They have to be involved in PE as well as in the other dimension of PA at school; (3) They have to collaborate (they are not alone), and; (4) Pre service and inservice PETE has to be adapted to show the way and change the mentalities [less ▲]

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See detailDo we need dark matter in cosmology?
Magain, Pierre ULg; Hauret, Clémentine ULg

Conference (2014, November 19)

Detailed reference viewed: 9 (8 ULg)