Publications ORBi OA
Bookmark and Share    
Full Text
See detailEnergies libres de surface des solides et des liquides: une approche de la compréhension des phénomènes interfaciaux
Courard, Luc ULg; Michel, Frédéric ULg

in Gagné, Richard (Ed.) Compte-rendu des Journées Scinetifiques du (RF)2B (2003)

Les propriétés de surface des matériaux conditionnent leur aptitude au mélange et à la réalisation de composites incluant deux ou plusieurs types de milieux différents. A coté des liaisons chimiques ... [more ▼]

Les propriétés de surface des matériaux conditionnent leur aptitude au mélange et à la réalisation de composites incluant deux ou plusieurs types de milieux différents. A coté des liaisons chimiques proprement dites et des aspects liés à l’interpénétration mécanique des matériaux, la thermodynamique des équilibres constitue une étape fondamentale pour comprendre les interactions potentielles au niveau de l’interface nouvellement créé. La loi de YOUNG-DUPRE, qui s’applique à l’équilibre entre une surface solide et un liquide, décrit les interactions qui se créent sur base des énergies libres des surfaces solides et liquides, de la tension interfaciale et de l’angle de contact solide - liquide. Les résultats présentés auront trait principalement au problème de la réparation des bétons et de la compatibilité des produits de réparation. [less ▲]

Detailed reference viewed: 24 (0 ULg)
Full Text
Peer Reviewed
See detailHow Daphnia copes with excess carbon in its food
Darchambeau, François ULg; Faerovig, P. J.; Hessen, D. O.

in Oecologia (2003), 136(3), 336-346

Animals that maintain near homeostatic elemental ratios may get rid of excess ingested elements from their food in different ways. C regulation was studied in juveniles of Daphnia magna feeding on two ... [more ▼]

Animals that maintain near homeostatic elemental ratios may get rid of excess ingested elements from their food in different ways. C regulation was studied in juveniles of Daphnia magna feeding on two Selenastrum capricornutum cultures contrasting in P content (400 and 80 C:P atomic ratios). Both cultures were labelled with C-14 in order to measure Daphnia ingestion and assimilation rates. No significant difference in ingestion rates was observed between P-low and P-rich food, whereas the net assimilation of C-14 was higher in the treatment with P-rich algae. Some Daphnia were also homogeneously labelled over 5 days on radioactive algae to estimate respiration rates and excretion rates of dissolved organic C (DOC). The respiration rate for Daphnia fed with high C:P algae (38.7% of body C day(-1)) was significantly higher than for those feeding on low C:P algae (25.3% of body C day(-1)). The DOC excretion rate was also higher when animals were fed on P-low algae (13.4% of body C day(-1)) than on P-rich algae (5.7% of body C day(-1)) . When corrected for respiratory losses, total assimilation of C did not differ significantly between treatments (around 60% of body C day(-1)). Judging from these experiments, D. magna can maintain its stoichiometric balance when feeding on unbalanced diets (high C:P) primarily by disposing of excess dietary C via respiration and excretion of DOC. [less ▲]

Detailed reference viewed: 15 (0 ULg)
Full Text
Peer Reviewed
See detailInteret des expectorations induites dans l'exploration de l'asthme.
Louis, Renaud ULg; Bettiol, Jane; Cataldo, Didier ULg et al

in Revue des Maladies Respiratoires (2003), 20(2 Pt 1), 215-23

INTRODUCTION: The technique of induced expectoration generates sputum by the inhalation of hypertonic saline. On account of its non-invasive character, its simplicity, its relative harmlessness, its cost ... [more ▼]

INTRODUCTION: The technique of induced expectoration generates sputum by the inhalation of hypertonic saline. On account of its non-invasive character, its simplicity, its relative harmlessness, its cost effectiveness and its reproducibility this technique, that appeared in the early 1990's, has rapidly established itself as the technique of choice in the investigation of bronchial inflammation in asthma. STATE OF THE ART: We present the results of our studies that have contributed to the validation of the technique at the methodological level and to the exploitation of the cellular contents as much as the fluid phase of the expectorations in characterising bronchial inflammation in asthmatics. Our results confirm an infiltration of the airways of asthmatics with eosinophils that appears to be proportional to the severity of the illness. We evaluate the effect of inhaled steroids and of theophylline on sputum eosinophilia and bronchial reactivity and discuss the role of eosinophils on bronchial hyperreactivity. Finally we discuss the use of induced expectoration in clinical practice in asthma. PERSPECTIVES: The analysis of induced sputum could well become a valuable tool in the clinical evaluation and monitoring of asthma in the same way as symptoms and abnormalities of lung function. CONCLUSIONS: Induced expectoration has certainly contributed to the understanding of the cellular and molecular mechanisms of asthma as well as the role of bronchial inflammation in the clinical manifestations of the disease. [less ▲]

Detailed reference viewed: 164 (17 ULg)
Full Text
Peer Reviewed
See detailCiel ouvert : la fin de l'attente
Dumoulin, André ULg

in Sur, Serge; Roche, Jean-Jacques (Eds.) Annuaire français de relations internationales 2003 (2003)

Le 1er janvier 2002 entrait en vigueur le traité sur le régime « Ciel ouvert ». Longtemps attendu, cette mesure de confiance et de sécurité repose sur la surveillance aérienne codifiée de pratiquement ... [more ▼]

Le 1er janvier 2002 entrait en vigueur le traité sur le régime « Ciel ouvert ». Longtemps attendu, cette mesure de confiance et de sécurité repose sur la surveillance aérienne codifiée de pratiquement tous les territoires d’États membres de l’OSCE, de l’Atlantique à l’Oural. Pur produit de la guerre froide, « Ciel ouvert » avait pour objectif de réduire la suspicion entre les États Parties. L’instabilité qui règne aujourd’hui dans certaines régions, le caractère complémentaire du régime par rapport au traité sur les Forces conventionnelles en Europe (FCE) et l’ouverture possible et à terme de « Ciel ouvert » à des nouvelles tâches grâce aux nouvelles technologies de surveillance aérienne, offrent à ce traité de nouvelles opportunités. [less ▲]

Detailed reference viewed: 19 (0 ULg)
Full Text
See detailLes groupes d'entraide ou l'émergence de dynamiques citoyennes
Biquet, Véronique ULg

in Observatoire : Revue d'Action Sociale & Médico-Sociale (2003), 39

L'article montre comment les groupes d'entraide peuvent constituer des lieux d'émergence de dynamiques citoyennes, en permettant qu'un pont soit crée entre l'espace privé des relations interpersonnelles ... [more ▼]

L'article montre comment les groupes d'entraide peuvent constituer des lieux d'émergence de dynamiques citoyennes, en permettant qu'un pont soit crée entre l'espace privé des relations interpersonnelles et l'espace public des questions relatives à la cité. [less ▲]

Detailed reference viewed: 19 (4 ULg)
Full Text
See detailLa qualité différenciée
Burny, Philippe ULg

in Centre de Recherches agronomiques de Gembloux (CRA) (Ed.) 3ème journée Productions porcines et avicoles "Vers une politique de qualité, à quel prix ?", Gembloux, 8 octobre 2003 (2003)

Detailed reference viewed: 11 (8 ULg)
Full Text
See detailDéveloppements récents en pychopédagogie et en linguistique appliquée pour la didactique des langues étrangères et secondes
Defays, Jean-Marc ULg

in Collès, Luc; Dufays, Jean-Louis; Maeder, C. (Eds.) Enseigner le français, l'espagnol et l'italien. Les langues romanes à l'heure des compétences (2003)

Detailed reference viewed: 23 (2 ULg)
Full Text
Peer Reviewed
See detailThe Mamluk Documents of the Venetian State Archives : Handlist
Bauden, Frédéric ULg

in Quaderni di Studi Arabi (2003), 20-21

Detailed reference viewed: 57 (2 ULg)
Full Text
Peer Reviewed
See detailShortened irradiation scheme, continuous infusion of 5-fluorouracil and fractionation of mitomycin C in locally advanced anal carcinomas. Results of a phase II study of the European Organization for Research and Treatment of Cancer. Radiotherapy and Gastrointestinal Cooperative Groups
Bosset, J. F.; Roelofsen, F.; Morgan, D. A. L. et al

in European Journal of Cancer (2003), 39

Abstract The European Organization for Research and Treatment of Cancer (EORTC) 22861 randomised trial established that combined radiochemotherapy is the standard treatment for locally advanced anal ... [more ▼]

Abstract The European Organization for Research and Treatment of Cancer (EORTC) 22861 randomised trial established that combined radiochemotherapy is the standard treatment for locally advanced anal cancer. This EORTC phase II study (#22953) tests the feasibility of reducing the gap between sequences to 2 weeks, to deliver Mitomycin C (MMC) in each radiotherapy sequence and 5-FU continuously during the treatment. The first sequence consisted of 36 Gy over 4 weeks. 5-FU 200 mg/m2/days 1–26, MMC 10 mg/m2/day 1 gap 16 days. Then a second sequence of 23.4 Gy over 17 days, 5-FU 200 mg/m2/days 1–17 and, MMC 10 mg/m2/day 1 was given. 43 patients with a World Health Organization (WHO) status of 0 (n=27) or 1 (n=16) and with T2-T4, N0-3 tumours were included. Compliance with the planned treatment, doses and duration was 93%. The complete response rate was 90.7%. Grade 3 toxicities of 28, 12 and 2% were observed for skin, diarrhoea and haematological toxicities, respectively. The 3-year estimated rates for trials 22861 and 22953 are: 68 and 88% for local control; 72 and 81% for colostomy-free interval, 62 and 84% for severe late toxicity-free interval, and 70 and 81% for survival, respectively. The 22953 scheme is feasible and the results are promising. This is now considered as the new standard scheme by the EORTC. [less ▲]

Detailed reference viewed: 20 (3 ULg)
Full Text
Peer Reviewed
See detailNucleation phenomenon in silica xerogels and Pd/SiO2, Ag/SiO2, Cu/SiO2 cogelled catalysts
Alié, Christelle ULg; Lambert, Stéphanie ULg; Heinrichs, Benoît ULg et al

in Journal of Sol-Gel Science and Technology (2003), 26(1-3), 827-830

Pd/SiO2, Ag/SiO2 and Cu/SiO2 xerogel catalysts have been synthesized by cogelation of tetraethoxysilane (TEOS) and chelates of Pd, Ag and Cu with 3-(2-aminoethylamino) propyltrimethoxysilane (EDAS). It ... [more ▼]

Pd/SiO2, Ag/SiO2 and Cu/SiO2 xerogel catalysts have been synthesized by cogelation of tetraethoxysilane (TEOS) and chelates of Pd, Ag and Cu with 3-(2-aminoethylamino) propyltrimethoxysilane (EDAS). It appears that, in cogelled samples, the metal complex acts as a nucleation agent in the formation of silica particles. The resulting catalysts are then composed of completely accessible metallic crystallites with a diameter of about 3 nm located inside silica porous particles with a monodisperse microporous distribution. Xerogels without metal synthesized with EDAS and TEOS (C. Alie, R. Pirard, A. J. Lecloux, and J.-P. Pirard, J. Non-Cryst. Solids 289, 88 (2001)) verify this hypothesis of nucleation by EDAS. [less ▲]

Detailed reference viewed: 40 (13 ULg)
Full Text
See detailStrength imbalances in hamstring strains
Croisier, Jean-Louis ULg; Forthomme, Bénédicte ULg; Crielaard, Jean-Michel ULg

in Vlaams Tijdschrift voor Sport Geneeskunde en Sport Wetenschappen (2003), 95

Detailed reference viewed: 19 (0 ULg)
Full Text
Peer Reviewed
See detailResource partitioning in two heterochronic populations of Greek Alpine newts, Triturus alpestris veluchiensis
Denoël, Mathieu ULg; Schabetsberger, R.

in Acta Oecologica: International Journal of Ecology (2003), 24(1), 55-64

Current ecological models suggest that the maintenance of trophic polymorphisms is favoured by a different resource use in alternative morphs. Facultative paedomorphosis in newts is an example of ... [more ▼]

Current ecological models suggest that the maintenance of trophic polymorphisms is favoured by a different resource use in alternative morphs. Facultative paedomorphosis in newts is an example of phenotypic variation as paedomorphs retain morphological larval traits, such as gills and gill slits. The aim of this study was to find out whether heterochronic morphs occupy particular micro-habitats and focus on specific prey items. Resource partitioning was found between morphs. It concerns mainly food selection with paedomorphs preying more on plankton and less on terrestrial invertebrates than metamorphs. Some habitat specializations were also found with metamorphs being more abundant at the water surface than paedomorphs. Diel variation in habitat use of the two different morphs was minimal. Polymorphism allows Alpine newts to exploit the different resources in the lakes in order to minimize intraspecific competition, but the extent of resource partitioning depends on habitat characteristics. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved. [less ▲]

Detailed reference viewed: 110 (16 ULg)
Full Text
See detailL'opération RESSAC : diagnostic métacognitif avant la période de 'bloque'
Leclercq, Dieudonné ULg; Detroz, Pascal ULg; Dupont, Chantal ULg et al

in Actes du 16ème colloque international de l'ADMEE-Europe, 4-6 septembre 2003 (2003)

Detailed reference viewed: 38 (4 ULg)
Full Text
Peer Reviewed
See detailProspective studyof CD4 and CD8 T-lynphocyte apoptosis as a marker for radiation induced late effects in 399 individual patients
Ozsahin; Crompton; Shi et al

in International Journal of Radiation, Oncology, Biology, Physics (2003), 55(2), 551-552

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailIdentification of type II and type III pyoverdine receptors from Pseudomonas aeruginosa.
de Chial, Magaly; Ghysels, Bart ULg; Beatson, Scott A. et al

in Microbiology (Reading, England) (2003), 149(Pt 4), 821-31

Pseudomonas aeruginosa produces, under conditions of iron limitation, a high-affinity siderophore, pyoverdine (PVD), which is recognized at the level of the outer membrane by a specific TonB-dependent ... [more ▼]

Pseudomonas aeruginosa produces, under conditions of iron limitation, a high-affinity siderophore, pyoverdine (PVD), which is recognized at the level of the outer membrane by a specific TonB-dependent receptor, FpvA. So far, for P. aeruginosa, three different PVDs, differing in their peptide chain, have been described (types I-III), but only the FpvA receptor for type I is known. Two PVD-producing P. aeruginosa strains, one type II and one type III, were mutagenized by a mini-TnphoA3 transposon. In each case, one mutant unable to grow in the presence of the strong iron chelator ethylenediaminedihydroxyphenylacetic acid (EDDHA) and the cognate PVD was selected. The first mutant, which had an insertion in the pvdE gene, upstream of fpvA, was unable to take up type II PVD and showed resistance to pyocin S3, which is known to use type II FpvA as receptor. The second mutant was unable to take up type III PVD and had the transposon insertion in fpvA. Cosmid libraries of the respective type II and type III PVD wild-type strains were constructed and screened for clones restoring the capacity to grow in the presence of PVD. From the respective complementing genomic fragments, type II and type III fpvA sequences were determined. When in trans, type II and type III fpvA restored PVD production, uptake, growth in the presence of EDDHA and, in the case of type II fpvA, pyocin S3 sensitivity. Complementation of fpvA mutants obtained by allelic exchange was achieved by the presence of cognate fpvA in trans. All three receptors posses an N-terminal extension of about 70 amino acids, similar to FecA of Escherichia coli, but only FpvAI has a TAT export sequence at its N-terminal end. [less ▲]

Detailed reference viewed: 12 (1 ULg)
Full Text
Peer Reviewed
See detailFracture prevention in postmenopausal women.
Bruyère, Olivier ULg; Edwards, John; Reginster, Jean-Yves ULg

in Clinical Evidence (2003), 9

Detailed reference viewed: 19 (9 ULg)
Full Text
Peer Reviewed
See detailNF-κB transcription factor induces drug resistance through MDR1 expression in cancer cells
Bentires-Alj, Mohamed; Barbu, Véronique; Fillet, Marianne ULg et al

in Oncogene (2003), 22

The ubiquitous NF-kappaB transcription factor has been reported to inhibit apoptosis and to induce drug resistance in cancer cells. Drug resistance is the major reason for cancer therapy failure and ... [more ▼]

The ubiquitous NF-kappaB transcription factor has been reported to inhibit apoptosis and to induce drug resistance in cancer cells. Drug resistance is the major reason for cancer therapy failure and neoplastic cells often develop multiple mechanisms of drug resistance during tumor progression. We observed that NF-kappaB or P-glycoprotein inhibition in the HCT15 colon cancer cells led to increased apoptotic cell death in response to daunomycin treatment. Interestingly, NF-kappaB inhibition through transfection of a plasmid coding for a mutated IkappaB-alpha inhibitor increased daunomycin cell uptake. Indeed, the inhibition of NF-kappaB reduced mdr1 mRNA and P-glycoprotein expression in HCT15 cells. We identified a consensus NF-kappaB binding site in the first intron of the human mdr1 gene and demonstrated that NF-kappaB complexes could bind with this intronic site. Moreover, NF-kappaB transactivates an mdr1 promoter luciferase construct. Our data thus demonstrate a role for NF-kappaB in the regulation of the mdr1 gene expression in cancer cells and in drug resistance. [less ▲]

Detailed reference viewed: 84 (9 ULg)