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See detailLe cas clinique du mois. Osteogenesis imperfecta
Kaux, Jean-François ULg; Le Goff, Caroline ULg; Debray, François-Guillaume ULg et al

in Revue Médicale de Liège (2009)

We report the case of a young boy who had had multiple bone fractures (more than 10) since the age of 19 months. The father had the same clinical history. The clinical examination was normal for his age ... [more ▼]

We report the case of a young boy who had had multiple bone fractures (more than 10) since the age of 19 months. The father had the same clinical history. The clinical examination was normal for his age except blue sclera. The bone densitometry showed a severe osteoporosis for his age. Biological exam swere correct. The genetic exploration revealed mutation of COL1A2 gene. With this clinical history, the diagnosis of Osteogenesis imperfecta (OI) was retained. OI is a hereditary dystrophy with abnormal synthesis or metabolism of collagen with, often, mutation of COL1A1 or COL1A2 genes. There are 7 different forms. We consider the possible differential diagnoses. The goal of any treatment is to promote bone remineralisation and to decrease the fracture frequency. The treatment includes calcium and vitamin D, and in the presence of some precise criteria, biphosphonate therapy. [less ▲]

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See detailWeekly satellite sea surface temperature around Corsica, a DINEOF analysis of AVHRR data (1998), foreseeing comparison with interpolated and modelled fields.
Sirjacobs, Damien ULg; Lenartz, Fabian ULg; Troupin, Charles ULg et al

Poster (2009, January)

Providing wide coverage and high spatio-temporal resolution, SST satellite archives are valuable sources of information for sound understanding of the ocean dynamics, including validation of ... [more ▼]

Providing wide coverage and high spatio-temporal resolution, SST satellite archives are valuable sources of information for sound understanding of the ocean dynamics, including validation of hydrodynamical modelling studies. Yet original SST fields have also many gaps (clouds, retrieval problems), but they are known to exhibit strong spatial and temporal correlations for regions of similar dynamics. This is exploited by the parameter free statistical technique DINEOF (Data Interpolation with Empirical Orthogonal Functions) [Alvera-Azcárate et al. (2005) Ocean Modell.; Beckers et al. (2006) Ocean Sciences] to produce full weekly analysis of the variability of the sea surface temperature (SST) around Corsica and in the Ligurian Sea at weekly temporal resolution during the year 1998. A detection of outliers implemented in DINEOF analysis is tested for pointing out unusual or invalid SST data. This study is realised foreseeing a comparison of DINEOF weekly averaged reconstructed fields with those obtained by interpolating methods on the same dataset (Data Interpolating Variationnal Analysis and Optimal Interpolation schemes), and with outputs of an implementation of the GHER 3D model in this area. [less ▲]

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See detailSensitivity analysis of prior model probabilities and the value of prior knowledge in the assessment of conceptual model uncertainty in groundwater modelling
Rojas, Rodrigo; Feyen, Luc; Dassargues, Alain ULg

in Hydrological Processes (2009), 23

A key point in the application of multi-model Bayesian averaging techniques to assess the predictive uncertainty in groundwater modelling applications is the definition of prior model probabilities, which ... [more ▼]

A key point in the application of multi-model Bayesian averaging techniques to assess the predictive uncertainty in groundwater modelling applications is the definition of prior model probabilities, which reflect the prior perception about the plausibility of alternative models. In this work the influence of prior knowledge and prior model probabilities on posterior model probabilities, multi-model predictions, and conceptual model uncertainty estimations is analysed. The sensitivity to prior model probabilities is assessed using an extensive numerical analysis in which the prior probability space of a set of plausible conceptualizations is discretized to obtain a large ensemble of possible combinations of prior model probabilities. Additionally, the value of prior knowledge about alternative models in reducing conceptual model uncertainty is assessed by considering three example knowledge states, expressed as quantitative relations among the alternative models. A constrained maximum entropy approach is used to find the set of prior model probabilities that correspond to the different prior knowledge states. For illustrative purposes, a three-dimensional hypothetical setup approximated by seven alternative conceptual models is employed. Results show that posterior model probabilities, leading moments of the predictive distributions and estimations of conceptual model uncertainty are very sensitive to prior model probabilities, indicating the relevance of selecting proper prior probabilities. Additionally, including proper prior knowledge improves the predictive performance of the multi-model approach, expressed by reductions of the multi-model prediction variances by up to 60% compared with a non-informative case. However, the ratio between-model to total variance does not substantially decrease. This suggests that the contribution of conceptual model uncertainty to the total variance cannot be further reduced based only on prior knowledge about the plausibility of alternative models. These results advocate including proper prior knowledge about alternative conceptualizations in combination with extra conditioning data to further reduce conceptual model uncertainty in groundwater modelling predictions. [less ▲]

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See detailChemical and enzymatical modifications of sugar derived from lignocellulose
Richard, Gaetan ULg; Laurent, Pascal ULg; Nott, Katherine ULg et al

Poster (2009, January)

Actually, biorefinery is increasingly considered as a promising alternative to petroleum chemistry, since it aims at not only the replacement of fossil energy but also the development of chemicals from ... [more ▼]

Actually, biorefinery is increasingly considered as a promising alternative to petroleum chemistry, since it aims at not only the replacement of fossil energy but also the development of chemicals from biomass, with applications such as detergents, phytopharmaceutics, solvents, plastics, etc. The valorisation of carbohydrates from renewable raw materials is currently the subject of numerous researches. In this context, the synthesis of new surfactants derived from the sugars issued from the lignocellulose hydrolysis was undertaken by chemical or enzymatic routes. In this poster, the examples of glucose, cellobiose and uronic acids will be discussed. Whatever the way used, the reaction conditions (use of a catalyst, protection/deprotection steps, type of solvent, presence of co-solvent, reactant concentrations, etc) were optimized to yield a panel of carbohydrate derivatives (some examples of the structures obtained are given above). These differ by the nature of the alkyl chain (in length and in degree of saturation), the type of chemical bond (amide, ester, thioester, acetal), and the position of substitution. The impact of these differences on the techno-functional properties of these modified sugars will be evaluated. [less ▲]

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See detailRouting Based on Delivery Distributions in Predictable Disruption Tolerant Networks
François, Jean-Marc; Leduc, Guy ULg

in Ad hoc Networks (2009), 7(1), 219-229

This article studies disruption tolerant networks (DTNs) where each node knows the probabilistic distribution of contacts with other nodes. It proposes a framework that allows one to formalize the ... [more ▼]

This article studies disruption tolerant networks (DTNs) where each node knows the probabilistic distribution of contacts with other nodes. It proposes a framework that allows one to formalize the behaviour of such a network. It generalizes extreme cases that have been studied before where (a) either nodes only know their contact frequency with each other or (b) they have a perfect knowledge of who meets who and when. This paper then gives an example of how this framework can be used; it shows how one can find a packet forwarding algorithm optimized to meet the ‘delay/bandwidth consumption’ tradeoff: packets are duplicated so as to (statistically) guarantee a given delay or delivery probability, but not too much so as to reduce the bandwidth, energy, and memory consumption. [less ▲]

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See detailPhytoplankton ecology of Lake Kivu (eastern Africa): biomass, production and elemental ratios
Sarmento, Hugo; Isumbisho, Mwapu; Stenuite, Stephan et al

in Verhandlungen der Internationalen Vereinigung für Theoretische und Angewandte Limnologie = Proceedings of the International Association of Theoretical and Applied Limnology (2009, January), 30(5), 709-713

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See detailConsensus optimization on manifolds
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg

in SIAM Journal on Control & Optimization (2009), 48(1), 56-76

The present paper considers distributed consensus algorithms that involve N agents evolving on a connected compact homogeneous manifold. The agents track no external reference and communicate their ... [more ▼]

The present paper considers distributed consensus algorithms that involve N agents evolving on a connected compact homogeneous manifold. The agents track no external reference and communicate their relative state according to a communication graph. The consensus problem is formulated in terms of the extrema of a cost function. This leads to efficient gradient algorithms to synchronize (i.e., maximizing the consensus) or balance (i.e., minimizing the consensus) the agents; a convenient adaptation of the gradient algorithms is used when the communication graph is directed and time-varying. The cost function is linked to a specific centroid definition on manifolds, introduced here as the induced arithmetic mean, that is easily computable in closed form and may be of independent interest for a number of manifolds. The special orthogonal group SO(n) and the Grassmann manifold Grass(p,n) are treated as original examples. A link is also drawn with the many existing results on the circle. [less ▲]

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See detailRadiative seesaw: Warm dark matter, collider and lepton flavour violating signals
Aristizabal Sierra, Diego ULg; Kubo, Jisuke; Restrepo, D. et al

in Physical Review D (2009), 79

Extending the standard model with three right-handed neutrinos (Nk) and a second Higgs doublet (η), odd under the discrete parity symmetry Z2, Majorana neutrino masses can be generated at one-loop order ... [more ▼]

Extending the standard model with three right-handed neutrinos (Nk) and a second Higgs doublet (η), odd under the discrete parity symmetry Z2, Majorana neutrino masses can be generated at one-loop order. In the resulting model, the lightest stable particle, either a boson or a fermion, might be a dark matter candidate. Here we assume a specific mass spectrum (M1≪M2<M3<mη) and derive its consequences for dark matter and collider phenomenology. We show that (i) the lightest right-handed neutrino is a warm dark matter particle that can give a ~10% contribution to the dark matter density; (ii) several decay branching ratios of the charged scalar can be predicted from measured neutrino data. Especially interesting is that large lepton flavor violating rates in muon and tau final states are expected. Finally, we derive upper bounds on the right-handed neutrino Yukawa couplings from the current experimental limit on Br(μ→eγ). [less ▲]

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See detailLes habitudes de sommeil chez les enfants de 2,5 à 6 ans
Philippe, Paule ULg; Scholl, Jean-Marc ULg; Zdanowicz, Nicolas

Poster (2009, January)

Introduction: les habitudes de sommeil chez les enfants sont éminemment variables suivant les enfants, les âges, les habitudes ou contraintes familiales. Elles sont d’autre part peu connues et peu ... [more ▼]

Introduction: les habitudes de sommeil chez les enfants sont éminemment variables suivant les enfants, les âges, les habitudes ou contraintes familiales. Elles sont d’autre part peu connues et peu investiguées en consultation. Mais peut-on relever des différences entre une population générale "normale" et une population prise en charge dans des consultations psychologiques ambulatoires? Méthode: un questionnaire concernant les habitudes de sommeil a été distribué à des parents d’enfants fréquentant l’enseignement ordinaire et à des parents d’enfants fréquentant des consultations psychologiques ambulatoires. 496 réponses (356 pour la population générale et 140 pour les enfants suivis en consultation) ont été recueillies et analysées. Des différences de distributions ont été mises en évidence entre les 2 groupes et des corrélations recherchées. Paramètres recherchés : - le nombre d’heures de sommeil par nuit en semaine et le week-end ; - le nombre d’enfants « couche-tôt » ou « couche-tard » ; - les caractéristiques de l’endormissement: l’enfant retarde la mise au lit, il a besoin d’une sucette/ d’un doudou/ d’un morceau de tissu/ d’un biberon/ de lumière ou noir complet/ d’une TV/ que la porte soit ouverte/ il manifeste un inconfort/ des peurs/ il s’endort seul dans sa chambre ou en présence d’un adulte avec éventuellement le besoin de tenir physiquement cet adulte/ durée moyenne de l’endormissement - l’endroit où dort l’enfant : dans sa chambre, avec un frère/ une sœur, dans la chambre des parents, dans une pièce de séjour commune … - les caractéristiques du temps de sommeil : sommeil agité, réveils nocturnes, cauchemars, cherche à rejoindre ses parents pendant la nuit Conclusions: les comportements liés au sommeil différencient spécifiquement le groupe des enfants recrutés dans les Services de Santé Mentale par rapport au groupe témoin. Dans notre pratique, une anamnèse détaillée dans ce domaine permet d’attirer l’attention sur une population fragile, à examiner plus attentivement et éventuellement à prendre en charge dès que possible. Une information et une aide pour les parents est à envisager très précocement; une information serait utile également pour les différents professionnels (puéricultrices, enseignants, éducateurs, médecins traitants...). [less ▲]

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See detailDeuxième campagne de mesure des odeurs sur le site de traitement des déchets de Tenneville Estimation des nuisances olfactives
Nicolas, Jacques ULg; Thomas, Jean-François; Delva, Julien et al

Report (2009)

The study is conducted in the frame of a programme of monitoring of all landfill sites in Wallonia. The "odour" part is assigned to ULg. The present report concerns more particularly a second campaign on ... [more ▼]

The study is conducted in the frame of a programme of monitoring of all landfill sites in Wallonia. The "odour" part is assigned to ULg. The present report concerns more particularly a second campaign on the site of Tenneville, which is more than a simple landfill area, as it includes also other waste treatment faciliities : composting, biogas production and drying of wastewater sludges. Besides the usual field inspection technique, the research group has applied a 3D analysis to study the shape and the size of the odour plume in this uneven region. [less ▲]

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See detailLiver transplantation from donation after cardiac death (DCD) donors: Belgian experience 2002-2007
Detry, Olivier ULg; Donckier, Vincent; Lucidi, V. et al

in Acta Gastro-Enterologica Belgica (2009, January), 72(1), 21

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See detailLaparoscopic management of colonoscopic perforations
Bouffioux, Laurent ULg; Coimbra Marques, Carla ULg; Lespagnard, A. C. et al

in Acta Gastro-Enterologica Belgica (2009, January), 72(1), 70

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See detailEffects of delayed introduction of calcineurin inhibitor on GFR in liver transplant: 12 month data from a multi-centre randomised controlled study
Pirenne, J.; Boon, N.; Colle, I. et al

in Acta Gastro-Enterologica Belgica (2009, January), 72(1), 30

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See detailResults of liver transplantation from controlled donation after cardiac death (DCD) donors: a single center experience
Detry, Olivier ULg; Seydel, Benoît ULg; Veys, C. et al

in Acta Gastro-Enterologica Belgica (2009, January), 72(1), 25

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See detailTests zur Flektierbarkeit von Partizipien II
Münzberg, Franziska ULg

Learning material (2009)

Wie entscheidet man schnell und trotzdem einigermaßen sicher, ob ein Partizip II flektiert und als Attribut verwendet werden kann, ohne dass es sehr auffällig oder gar "falsch" wirkt? Dieses Paper ist ein ... [more ▼]

Wie entscheidet man schnell und trotzdem einigermaßen sicher, ob ein Partizip II flektiert und als Attribut verwendet werden kann, ohne dass es sehr auffällig oder gar "falsch" wirkt? Dieses Paper ist ein pädagogischer Versuch und ersetzt nicht die Korpusrecherche im Einzelfall - Feedback ist willkommen. [less ▲]

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See detailURBANISME: Quartier Juif
Szanto, Catherine ULg

Article for general public (2009)

Depuis 2002, date de son inscription au Patrimoine Mondial de l’UNESCO, le quartier a vu plus de démolitions que pendant la seconde guerre mondiale. Le projet de l’exposition proposée par l'association de ... [more ▼]

Depuis 2002, date de son inscription au Patrimoine Mondial de l’UNESCO, le quartier a vu plus de démolitions que pendant la seconde guerre mondiale. Le projet de l’exposition proposée par l'association de défense du quartier ÓVÁS! est de montrer les transformations physiques du quartier permises par le nouveau plan d’urbanisme en vigueur depuis septembre, et à proposer une autre façon de penser. [less ▲]

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See detailnotices du catalogue de l’exposition : Giotto e il Trecento: “il più Sovrano Maestro stato in dipintura"
D'Alberto, Claudia ULg

in Giotto e il Trecento: “il più Sovrano Maestro stato in dipintura" (2009)

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See detailOptimization of PCR Conditions to Amplify Microsatellite Loci in Grapevine (Vitis vinifera L.) Genomic DNA
Ghaffari, Sana; Hasnaoui, Nejib ULg; Ferchichi, Ali

in Revue des Régions Arides (2009), 24

A total of three different primer pairs were optimized for polymerase chain reaction (PCR) to amplify microsatellite loci in total genomic DNA of grapevine (Vitis vinifera L.). Different concentrations of ... [more ▼]

A total of three different primer pairs were optimized for polymerase chain reaction (PCR) to amplify microsatellite loci in total genomic DNA of grapevine (Vitis vinifera L.). Different concentrations of MgCl2, DNA and different regimes of annealing temperature were optimized. For all the primer pairs, 2.5 mM MgCl2 concentration was found optimum. For DNA concentration, 100 ng in the final reaction volume was suitable for good amplification. Annealing temperatures 56°C, 61°C and 58°C were found optimum to amplify with primer pairs VVMD5, scu04vv and VMC8E6, respectively. The other reagents used in PCR and temperature regimes (denaturation and extension temperature) were kept constant. The protocol has been successfully applied producing scorable and clear amplicons in all cultivars studied. These loci can be used to evaluate the genetic variability and cultivar relatedness in autochthonous Vitis vinifera cultivars from Tunisia. [less ▲]

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See detailImpact of winter feeding strategies on the growth of young dairy heifers in Wallonia
Picron, Pascale ULg; Turlot, Amélie; Froidmont, Eric et al

Conference (2009)

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