Bilan des connaissances sur les dommages piscicoles engendrés par les prises d'eau industrielles et les centrales hydroélectriques dans les cours d'eau de la Province de Liège.
Philippart, Jean-Claude ; Ovidio, Michaël ; Poncin, Pascal
Report (2010)Detailed reference viewed: 73 (16 ULg)
Own song selectivity in the songbird auditory pathway: suppression by norepinephrine
; ; et al
Poster (2010)Detailed reference viewed: 6 (0 ULg)
Microtomographic investigation of a yeast grain porous structure
; Léonard, Angélique ; et al
in Journal of Food Engineering (2010), 97Detailed reference viewed: 39 (7 ULg)
History effect of light and temperature on monoterpenoid emissions from Fagus sylvatica L.
; ; et al
in Atmospheric Environment (2010), 44(27), 3261-3268
Monoterpenoid emissions from Fagus sylvatica L trees have been measured at light- and temperature-controlled conditions in a growth chamber, using Proton Transfer Reaction Mass Spectrometry (PTR-MS) and ... [more ▼]
Monoterpenoid emissions from Fagus sylvatica L trees have been measured at light- and temperature-controlled conditions in a growth chamber, using Proton Transfer Reaction Mass Spectrometry (PTR-MS) and the dynamic branch enclosure technique. De novo synthesized monoterpenoid Standard Emission Factors, obtained by applying the G97 algorithm (Guenther, 1997), varied between 2 and 32 mu g g(-1)DW h(-1) and showed a strong decline in late August and September, probably due to senescence. The response of monoterpenoid emissions to temperature variations at a constant daily light pattern could be well reproduced with a modified version of the MEGAN algorithm (Guenther et al., 2006), with a typical dependence on the average temperature over the past five days. The diurnal emissions at constant temperature showed a typical hysteretic behaviour, which could also be adequately described with the modified MEGAN algorithm by taking into account a dependence on the average light levels experienced by the trees during the past 10-13 h. The impact of the past light and temperature conditions on the monoterpenoid emissions from E sylvatica L was found to be much stronger than assumed in previous algorithms. Since our experiments were conducted under low light intensity, future studies should aim at confirming and completing the proposed algorithm updates in sunny conditions and natural environments. (C) 2010 Elsevier Ltd. All rights reserved. [less ▲]Detailed reference viewed: 27 (3 ULg)
Numerical simulation of two-dimensional and three-dimensional axisymmetric advection-diffusion systems with complex geometries using finite-volume methods
; Geris, Liesbet ; et al
in Proceedings : Mathematical, Physical & Engineering Sciences (2010), 466(2118), 1621-1643
A finite-volume method has been developed that can deal accurately with complicated, curved boundaries for both two-dimensional and three-dimensional axisymmetric advection-diffusion systems. The ... [more ▼]
A finite-volume method has been developed that can deal accurately with complicated, curved boundaries for both two-dimensional and three-dimensional axisymmetric advection-diffusion systems. The motivation behind this is threefold. Firstly, the ability to model the correct geometry of a situation yields more accurate results. Secondly, smooth geometries eliminate corner singularities in the calculation of, for example, mechanical variables and thirdly, different geometries can be tested for experimental applications. An example illustrating each of these is given: fluid carrying a dye and rotating in an annulus, bone fracture healing in mice, and using vessels of different geometry in an ultracentrifuge. [less ▲]Detailed reference viewed: 36 (6 ULg)
Cathodic electrografting of acrylics: From fundamentals to functional coatings
Gabriel, Sabine ; Jérôme, Robert ; Jérôme, Christine
in Progress in Polymer Science (2010), 35
Promoting permanent adhesion between so dissimilar materials as polymers and metals is a very challenging target and a severe brake to the implementation of many potential applications. However, synthetic ... [more ▼]
Promoting permanent adhesion between so dissimilar materials as polymers and metals is a very challenging target and a severe brake to the implementation of many potential applications. However, synthetic polymers can now be chemisorbed onto a variety of conducting surfaces by cathodic electrografting of acrylic monomers. The first part of this review will focus on the fundamental aspects of this emerging technology, thus from the historical discovery to experimental and theoretical developments, with the purpose to better comprehend the electrografting phenomenon. Once firmly established, this concept has been exploited in order to make polymeric coatings with specific functionality chemisorbed onto more diversified substrates in more convenient liquid media. This remarkable progress that largely relies on advanced controlled polymerization processes will be the topic of the second part of the review, with a special emphasis on the more recent development of smart coatings, particularly stimuli responsive coatings very well-suited to nanotechnologies. [less ▲]Detailed reference viewed: 84 (29 ULg)
Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field
; Fagnard, Jean-François ; et al
in Superconductor Science and Technology (2010), 23
In this work we study, both experimentally and numerically, the self-heating of a bulk, large YBCO pellet of aspect ratio (thickness / diameter) ~ 0.4 subjected to a large AC magnetic field. To ensure ... [more ▼]
In this work we study, both experimentally and numerically, the self-heating of a bulk, large YBCO pellet of aspect ratio (thickness / diameter) ~ 0.4 subjected to a large AC magnetic field. To ensure accurate temperature measurements, the sample was placed in an experimental vacuum chamber to achieve a small and reproducible heat transfer coefficient between the superconductor and the cryogenic fluid. The temperature was measured at several locations on the sample surface during the self-heating process. The experimentally determined temperature gradients are found to be very small in this arrangement (< 0.2 K across the radius of the superconductor). The time-dependence of the average temperature T(t) is found to agree well with a theoretical prediction based on the one-dimensional (1-D) Bean model, assuming a uniform temperature in the sample. A 2-D magneto-thermal model was also used to determine the space and time-dependent temperature distribution T(r, z, t) during the application of the AC field. The losses in the bulk pellet were determined using an algorithm based on the numerical method of Brandt, which was combined with a heat diffusion algorithm implemented using a finite-difference method. The model is shown to be able to reproduce the main trends of the observed temperature evolution of the bulk sample during a self-heating process. Finally, the 2-D model is used to study the effect of a non-uniform distribution of critical current density Jc(r, z) on the losses within the bulk superconductor. [less ▲]Detailed reference viewed: 73 (41 ULg)
Marker imputation with low-density marker panels in Dutch Holstein cattle.
; Druet, Tom
in Journal of Dairy Science (2010), 93(11), 5487-94
The availability of high-density bovine genotyping arrays made implementation of genomic selection possible in dairy cattle. Development of low-density single nucleotide polymorphism (SNP) panels will ... [more ▼]
The availability of high-density bovine genotyping arrays made implementation of genomic selection possible in dairy cattle. Development of low-density single nucleotide polymorphism (SNP) panels will allow the extension of genomic selection to a larger portion of the population. Prediction of ungenotyped markers, called imputation, is a strategy that allows using the same low-density chips for all traits (and for different breeds). In the present study, we evaluated the accuracy of imputation with low-density genotyping arrays in the Dutch Holstein population. Five different sizes of genotyping arrays were tested, from 384 to 6,000 SNP. According to marker density, the overall allelic imputation error rate obtained with the program DAGPHASE, which relies on linkage disequilibrium and linkage, ranged from 11.7 to 2.0%, and that obtained with the program CHROMIBD, which relies on linkage and the set of all genotyped ancestors, ranged from 10.7 to 3.3%. However, imputation efficiency was influenced by the relationship between low-density and high-density genotyped animals. Animals with both parents genotyped had particularly low imputation error rates: <1% with 1,500 SNP or more. In summary, missing marker alleles can be predicted with 3 to 4% errors with approximately 1 SNP/Mb (approximately 3,000 markers). The CHROMIBD program proved more efficient than DAGPHASE only at lower marker densities or when several genotyped ancestors were available. Future studies are required to measure the effect of these imputation error rates on accuracy of genomic selection with low-density SNP panels. [less ▲]Detailed reference viewed: 31 (4 ULg)
Enteropathogenic (EPEC), enterohaemorragic (EHEC) and verotoxigenic (VTEC) Escherichia coli in wild cervids
Bardiau, Marjorie ; Grégoire, Fabien ; Muylaert, Adeline et al
in Journal of Applied Microbiology (2010), 109(6), 2214-2222Detailed reference viewed: 47 (6 ULg)
Stigmasterol: a phytosterol with potential anti-osteoarthritic properties.
; Sanchez, Christelle ; et al
in Osteoarthritis and Cartilage (2010), 18(1), 106-16
OBJECTIVE: Although most studies have focused on the cholesterol-lowering activity of stigmasterol, other bioactivities have been ascribed to this plant sterol compound, one of which is a potential anti ... [more ▼]
OBJECTIVE: Although most studies have focused on the cholesterol-lowering activity of stigmasterol, other bioactivities have been ascribed to this plant sterol compound, one of which is a potential anti-inflammatory effect. To investigate the effects of stigmasterol, a plant sterol, on the inflammatory mediators and metalloproteinases produced by chondrocytes. METHOD: We used a model of newborn mouse chondrocytes and human osteoarthritis (OA) chondrocytes in primary culture stimulated with or without IL-1beta (10 ng/ml), for 18 h. Cells were pre-incubated for 48 h with stigmasterol (20 microg/ml) compared to untreated cells. We initially investigated the presence of stigmasterol in chondrocyte, compared to other phytosterols. We then assessed the role of stigmasterol on the expression of various genes involved in inflammation (IL-6) and cartilage turn-over (MMP-3, -13, ADAMTS-4, -5, type II collagen, aggrecan) by quantitative Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR). Additional experiments were carried out to monitor the production of MMP-3 and prostaglandin E2 (PGE(2)) by specific immuno-enzymatic assays. We eventually looked at the role of stigmasterol on NF-kappaB activation by western blot, using an anti-IkappaBalpha antibody. RESULTS: After 18 h of IL-1beta treatment, MMP-3, MMP-13, ADAMTS-4, but not ADAMTS-5 RNA expression were elevated, as well as MMP-3 and PGE(2) protein levels in mouse and human chondrocytes. Type II collagen and aggrecan mRNA levels were significatively reduced. Pre-incubation of stigmasterol to IL-1beta-treated cells significantly decreased these effects described above (significant reduction of MMP-3 mRNA in human and mouse, MMP-3 protein in mouse, MMP-13 mRNA in mouse and human, ADAMTS-4 mRNA in human, PGE(2) protein in human and mouse) Finally, stigmasterol was capable of counteracting the IL-1beta-induced NF-kappaB pathway. CONCLUSION: This study shows that stigmasterol inhibits several pro-inflammatory and matrix degradation mediators typically involved in OA-induced cartilage degradation, at least in part through the inhibition of the NF-kappaB pathway. These promising results justify further ex vivo and in vivo investigations with stigmasterol. [less ▲]Detailed reference viewed: 79 (2 ULg)
Les modèles etiologiques de la dépression
in Acta Psychiatrica Belgica (2010), 110(4), 34-42
La dépression est une maladie psychique fréquente, récurrente et invalidante pour la personne qui en souffre et son entourage. En deux siècles de psychiatrie, l’étiologie exacte de la dépression reste ... [more ▼]
La dépression est une maladie psychique fréquente, récurrente et invalidante pour la personne qui en souffre et son entourage. En deux siècles de psychiatrie, l’étiologie exacte de la dépression reste inconnue. C’est pourquoi différentes hypothèses étiologiques ont été et sont toujours proposées. Cette revue a pour but de présenter différent modèles étiologiques de la dépression : le modèle psychanalytique, le modèle comportemental et les théories environnementales, le modèle cognitif, le modèle systémique, le modèle biologique et neuropsychologique, et le modèle éthologique. [less ▲]Detailed reference viewed: 437 (15 ULg)
review of Luke Sunderland, Old French Narrative Cycles. Heroism between Ethics and Morality
in Medioevo Romanzo (2010), 34(2), 440-442Detailed reference viewed: 9 (0 ULg)
Imputation of genotypes from different single nucleotide polymorphism panels in dairy cattle.
Druet, Tom ; ;
in Journal of Dairy Science (2010), 93(11), 5443-54
Imputation of missing genotypes is important to join data from animals genotyped on different single nucleotide polymorphism (SNP) panels. Because of the evolution of available technologies, economical ... [more ▼]
Imputation of missing genotypes is important to join data from animals genotyped on different single nucleotide polymorphism (SNP) panels. Because of the evolution of available technologies, economical reasons, or coexistence of several products from competing organizations, animals might be genotyped for different SNP chips. Combined analysis of all the data increases accuracy of genomic selection or fine-mapping precision. In the present study, real data from 4,738 Dutch Holstein animals genotyped with custom-made 60K Illumina panels (Illumina, San Diego, CA) were used to mimic imputation of genotypes between 2 SNP panels of approximately 27,500 markers each and with 9,265 SNP markers in common. Imputation efficiency increased with number of reference animals (genotyped for both chips), when animals genotyped on a single chip were included in the training data, with regional higher marker densities, with greater distance to chromosome ends, and with a closer relationship between imputed and reference animals. With 0 to 2,000 animals genotyped for both chips, the mean imputation error rate ranged from 2.774 to 0.415% and accuracy ranged from 0.81 to 0.96. Then, imputation was applied in the Dutch Holstein population to predict alleles from markers of the Illumina Bovine SNP50 chip with markers from a custom-made 60K Illumina panel. A cross-validation study performed on 102 bulls indicated that the mean error rate per bull was approximately equal to 1.0%. This study showed the feasibility to impute markers in dairy cattle with the current marker panels and with error rates below 1%. [less ▲]Detailed reference viewed: 49 (10 ULg)
The temporal use of French ‘à travers (de)’: metaphorical transfer or cancellation of the spatial sense?
Poster (2010)Detailed reference viewed: 10 (1 ULg)
Compte rendu de G. SMALL, Late Medieval France, Basingstoke, Palgrave Macmillan, 2009.
in Moyen Age (Le) (2010), 116Detailed reference viewed: 9 (0 ULg)
The use of French ‘à travers (de)’ for describing a movement along a curved surface: peripheral membership or anomaly?
Conference (2010)Detailed reference viewed: 7 (0 ULg)
Validation of a new French-language triage algorithm : the ELISA scale.
Jobe, Jérôme ; Ghuysen, Alexandre ; et al
in Critical Care (2010), 14(Suppl1), 277Detailed reference viewed: 39 (14 ULg)
Le Groupe µ entre rhétorique et sémiotique. Archéologie et perspectives
Dondero, Maria Giulia ; Badir, Sémir
in Protée (2010), 38(1),Detailed reference viewed: 124 (31 ULg)