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See detailFinite-size effects in BaTiO3 nanowires
Geneste, G.; Bousquet, Eric ULg; Junquera, J. et al

in Applied Physics Letters (2006), 88

The size dependence of the ferroelectric properties of BaTiO3 nanowires is studied from first principles. We show that the ferroelectric distortion along the wire axis disappears below a critical diameter ... [more ▼]

The size dependence of the ferroelectric properties of BaTiO3 nanowires is studied from first principles. We show that the ferroelectric distortion along the wire axis disappears below a critical diameter of about 1.2 nm. This disappearance is related to a global contraction of the unit cell resulting from low atomic coordinations at the wire surface. It is shown that a ferroelectric distortion can be recovered under appropriate tensile strain conditions. (c) 2006 American Institute of Physics. [less ▲]

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See detailRetour sur l'épisode humanitaire roumain
Pirotte, Gautier ULg

in Humanitaire. Enjeux, pratiques & débats (2006), (15; Autum/Winter), 4-9

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See detailCloning and embryonic expression of zebrafish PLAG genes.
Pendeville, Helene; Peers, Bernard ULg; Kas, Koen et al

in Gene Expression Patterns (2006), 6(3), 267-76

PLAG transcription factors play important roles in oncogenesis. To date three members of this subfamily of zinc finger proteins have been identified in humans and mice: PLAG1, PLAGL1 and PLAGL2. In this ... [more ▼]

PLAG transcription factors play important roles in oncogenesis. To date three members of this subfamily of zinc finger proteins have been identified in humans and mice: PLAG1, PLAGL1 and PLAGL2. In this study, we identified zebrafish orthologs of PLAG1 and PLAGL2 and a novel member of this family, PLAGX. We examined the temporal expression of these three genes by quantitative real time RT-PCR and found that all three genes are maternally provided, expressed at low level during early somitogenesis and, during late somitogenesis and beyond, PLAG expression increases to reach a plateau level around 5 dpf. Whole mount in situ experiments revealed that PLAG1, PLAGL2 and PLAGX display a similar pattern of expression characterized by a low ubiquitous expression overcame by high expression in some restricted compartments such as the ventricular zone of the brain, the pectoral fin buds, the developing pharyngeal arches and the axial vasculature. We show that this pattern resembles the one observed for the proliferative marker PCNA, suggesting that the PLAG genes are expressed more strongly in zones of active proliferation. This hypothesis was proven for the ventricular zone shown to be a highly proliferative zone using the anti-phosphohistone H3 antibody that detects cells in mitosis. [less ▲]

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See detailA Riesz basis of wavelets and its dual with quintic deficient splines
Bastin, Françoise ULg

in Note di Matematica (2006), 25(1), 55-62

In this note, the dual of the Riesz basis of quintic splines obtained by Bastin and Laubin in [1] is explicitely constructed. ([1]=Quintic deficient splines wavelets, in Bull. Soc. Roy. Sc. Liège, Vol. 71 ... [more ▼]

In this note, the dual of the Riesz basis of quintic splines obtained by Bastin and Laubin in [1] is explicitely constructed. ([1]=Quintic deficient splines wavelets, in Bull. Soc. Roy. Sc. Liège, Vol. 71 (3), 2002, 121-144) [less ▲]

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See detailRange dependence compensation in STAP for arbitrary engagement geometries and receiver antenna arrays
Ries, Philippe; De Grève, Sébastien; Neyt, Xavier et al

Conference (2006)

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See detailInterleukin-6 mediates subchondral osteoblasts-induced cartilage degradation
Sanchez, Christelle ULg; Kaut, Elizabeth; DEBERG, Michelle ULg et al

Conference (2006)

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See detailThe power of hybrid acceleration
Boigelot, Bernard ULg; Herbreteau, Frédéric

in Lecture Notes in Computer Science (2006), 4144

This paper addresses the problem of computing symbolically the set of reachable configurations of a linear hybrid automaton. A solution proposed in earlier work consists in exploring the reachable ... [more ▼]

This paper addresses the problem of computing symbolically the set of reachable configurations of a linear hybrid automaton. A solution proposed in earlier work consists in exploring the reachable configurations using an acceleration operator for computing the iterated effect of selected control cycles. Unfortunately, this method imposes a periodicity requirement on the data transformations labeling these cycles, that is not always satisfied in practice. This happens in particular with the important subclass of timed automata, even though it is known that the paths of such automata have a periodic behavior. The goal of this paper is to broaden substantially the applicability of hybrid acceleration. This is done by introducing powerful reduction rules, aimed at translating hybrid data transformations into equivalent ones that satisfy the periodicity criterion. In particular, we show that these rules always succeed in the case of timed automata. This makes it possible to compute an exact symbolic representation of the set of reachable configurations of a linear hybrid automaton, with a guarantee of termination over the subclass of timed automata. Compared to other known solutions to this problem, our method is simpler, and applicable to a much larger class of systems. [less ▲]

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See detailGeo-electrical data fusion by stochastic co-conditioning simulations for delineating groundwater protection zones
Dassargues, Alain ULg

in CMWR XVI - Computational Methods in Water Resources (2006)

In hydrogeology, advances in the delimitation of protection zones are made by the use of stochastic simulations integrating all available data. In practice, due to the few available measurements of the ... [more ▼]

In hydrogeology, advances in the delimitation of protection zones are made by the use of stochastic simulations integrating all available data. In practice, due to the few available measurements of the main parameters (hard data), it is very useful to integrate several secondary properties of the media as indirect data (soft data) to reduce the uncertainty of the results. In aquifers, most of the solute spreading is governed by the hydraulic conductivity (K) spatial variability, which is generally considered as the main uncertain parameter. A stochastic approach integrating hydraulic conductivity measurements (hard data), head observations and shallow electrical resistivity tomography (soft data) is presented. Results are discussed on a synthetic and on a practical case. It is shown in practice how the uncertainty of the well capture zone probability distribution (CaPD) can be reduced. Since geophysical data and head observations are easier to collect on the field then hydraulic conductivity measurements, they are generally more abundant. The methodology presented can even be used in real applications when little or no information is available about the hydraulic properties, through the conditioning on geophysical data and/or head observations. [less ▲]

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See detailSingle-player games: introduction to a new solving method
Van Lishout, François ULg

Master of advanced studies dissertation (2006)

In many games, the machine has become stronger than the best human players. Machines have already beaten the human World Champion in famous games like Checkers, Chess, Scrabble and Othello. However ... [more ▼]

In many games, the machine has become stronger than the best human players. Machines have already beaten the human World Champion in famous games like Checkers, Chess, Scrabble and Othello. However, mankind has not been humbled by chips in all games. The best human players are still stronger than computers in games like Go, Poker, Chinese Chess and Hex. In this thesis, we will focus on a new way to model single-player games in order to improve the performances of the machine. We will demonstrate this technique on the game of Sokoban. [less ▲]

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See detailSauvage... le chat l'est-il toujours autant qu'on le souhaite ?
Le Proux de la Rivière, Bettina; Libois, Roland ULg

Learning material (2006)

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See detailThe Future of Space-Based Interferometry
Carpenter, K. G.; Allen, R.; Benson, J. et al

in “Future Directions for Interferometry” (2006)

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See detailStrategy for the qualitative and quantitative analysis of crop syrup containing enzymatically produced Isomaltooligosaccharides known as emerging prebiotics.
Goffin, Dorothée ULg; Blecker, Christophe ULg; Wathelet, Bernard ULg et al

Poster (2006)

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human ... [more ▼]

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human subjects, support the involvement of dietary oligosaccharides in physiological processes in the different intestinal cell type and also outside the gastrointestinal tract (e.g. hormone production, lipid and carbohydrate metabolism). IMOs consists of glucose monomers linked by at least one α-1-6, or in a lower proportion α -1-3 (nigerose family) or α -1-2 (kojibiose family) glucosidic linkages. In our case they are produced enzymatically from corn starch. It results in a very complex mixture with molecules characterized at the same time by their DP value (from 2 to ~20), linkages types (α-1-2, 3 or 6) and the proportion and position of each type of linkage (only α -1-6 or combined types). The challenge of this study was to find a qualitative and quantitative method to characterize the syrups. In a subsequent study, every unidentified peak could be determined by NMR or Mass spectrometry. Three different chromatographic methods have been tested and compared over their selectivity, sensibility, robustness, applicability and their quantitative power. The HPLC-RID (Refractive Index Detector) used with a Prevail Carbohydrate column (Alltech), adapted for carbohydrates with a certain value of DP, appear to be poorly selective due to the obligation of working in isocratic conditions. The HPLC-ELSD (Evaporating Light Scattering Detector) used with the same column gave a very good separation upon the DP as the Prevail accepts a wide range of solvant changing and even a separation of the different DP 2 molecules. The sensibility was also improved due to the stability of the baseline. The quantitative analysis is a bit more awkward due to the relatively limited linear portion of the calibration curve. High-performance Anion Exchange Chromatography coupled with Pulsed Amperometric Detection (HPAEC-PAD) appeared to deserve a special mention, since it provides selective separation and sensitive detection. In fact, this technique is the only chromatographic one to separate with effectiveness homologue molecules having a difference only in their DP (up to high DPs) or linkage types. This is due to the separation mode based on the difference in ionic force of the sugars in alkaline conditions (mainly due to the DP and the structure of the molecule). However, during the detection, the electrochemical behavior of carbohydrates can be affected by molecular weight as well as by structural differences giving rise to different response factors; as a consequence, HPAEC-PAD is not generally considered as suitable for quantitative studies of complex mixtures of oligosaccharides. In this work a methodological approach is presented in order to get a quantitative response through a rigorous methodology for our IMOs. It also opens the way to the theoretical determination of the response factor for the homologue molecules in relation with their structure and DP. [less ▲]

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See detailElevated MMP-12 protein levels in induced sputum from patients with COPD
Demedts, Inge K.; Morel-Montero, A.; Lebecque, S. et al

in Thorax (2006), 61(3), 196-201

Background: Several matrix metalloproteinases ( MMPs) are involved in the pathogenesis of chronic obstructive pulmonary disease ( COPD). In mice, MMP-12 plays a crucial role in the development of ... [more ▼]

Background: Several matrix metalloproteinases ( MMPs) are involved in the pathogenesis of chronic obstructive pulmonary disease ( COPD). In mice, MMP-12 plays a crucial role in the development of cigarette smoke induced emphysema. A study was undertaken to investigate the role of MMP-12 in the development of COPD in human smokers. Methods: Induced sputum samples were collected from patients with stable COPD (n = 28), healthy smokers ( n = 14), never smokers ( n = 20), and former smokers ( n = 14). MMP-12 protein levels in induced sputum were determined by ELISA and compared between the four study groups. MMP-12 enzymatic activity in induced sputum was evaluated by casein zymography and by cleaving of a fluorescence quenched substrate. Results: Median (IQR) MMP-12 levels were significantly higher in COPD patients than in healthy smokers, never smokers, and former smokers (17.5 (7.1 - 42.1) v 6.7 (3.9 - 10.4) v 4.2 (2.4 - 11.3) v 6.1 (4.5 - 7.6) ng/ml, p = 0.0002). MMP-12 enzymatic activity was significantly higher in patients with COPD than in controls (4.11 (1.4 - 8.0) v 0.14 (0.1 - 0.2) mu g/ml, p = 0.0002). Conclusion: MMP-12 is markedly increased in induced sputum from patients with stable COPD compared with controls, suggesting a role for MMP-12 in the development of COPD in smokers. [less ▲]

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See detailComparaison des performances zootechniques et du contenu en azote de l'effluent lors de l'élevage de porcs charcutiers sur caillebotis ou sur litière de paille accumulée.
Philippe, François-Xavier ULg; Laitat, Martine ULg; Vandenheede, Marc ULg et al

in Annales de Médecine Vétérinaire (2006), 150(2), 137-144

Two identical rooms were arranged to house fattening pigs on a fully-slatted floor in one and on a straw-based deep litter in the other one. Each room was ventilated with an exhausted fan and the ... [more ▼]

Two identical rooms were arranged to house fattening pigs on a fully-slatted floor in one and on a straw-based deep litter in the other one. Each room was ventilated with an exhausted fan and the ventilation rates were adapted to have the same temperatures in the two rooms. Six successive batches of 16 pigs per pen were raised. The slurry pit was emptied and the litter removed after each fattening period. The mean daily weight gains of the pigs raised on slatted floor and on deep litter were of 742 and 729 g/day, the food conversion ratios 3.0 and 3.1 kg/kg, the lean meat percentages 59.8 and 60.0 % and the prices at slaughter 1.06 and 1.04 E/kg live weight, respectively. None of the differences was statistically significant. The amounts of slurry and manure produced were 290 and 187 kg per fattening pig, corresponding to 3.04 and 2.06 kg nitrogen per fattening pig, respectively. These differences were significant. [less ▲]

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See detailGreen leaf area decline of wheat top three leaves in Belgium and G-D of Luxembourg from 2003 to 2005 : the relationships with grain yield.
Martin, B.; El Jarroudi, Moussa ULg; Tychon, Bernard ULg

in Bibliotheca fragmenta agronomica - Book of proceedings (2006), 11(1), 167-168

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See detailA-t-on evalue l'interet du SAMU?
Bodson, Lucien ULg; Grenade, J.; Micheels, Jean ULg et al

in Revue Médicale de Liège (2006), 61(5-6, May-Jun), 494-9

Recent international guidelines about emergency situations (ILCOR / ERC) pointed to the need of the whole "chain of survival". ALS, Advanced Life Support (the last and "medical" part of the chain ) is ... [more ▼]

Recent international guidelines about emergency situations (ILCOR / ERC) pointed to the need of the whole "chain of survival". ALS, Advanced Life Support (the last and "medical" part of the chain ) is important and influences survival rate. If no doubt exists about "what" and "when" to do in such situations, there is no consensus in industrialized countries about "who" should be in charge of such out-of-hospital acute diagnosis and treatment: emergency physicians, emergency nurses, emergency medical technicians (EMT), other "new" professionals ? ... A description of the MICU system in Belgium is given. [less ▲]

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See detailIncomplete muscle strength recovery in injured professional football players
Croisier, Jean-Louis ULg; Ganteaume, S.; Genty, M. et al

in Abstract book du 11th Annual Congress of the European College of Sports Science (ECSSA) (2006)

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