References of "2003"
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See detailUn cas peu connu de traduction du grec en latin : l'Asclepius du Corpus Hermeticum
Rochette, Bruno ULg

in Cahiers du Centre Gustave Glotz (2003), 14

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See detailSentence processing strategies in French-speaking children with SLI: a study of morphosyntactic cues
Maillart, Christelle ULg; Schelstraete, Marie-Anne

in Journal of Multilingual Communication Disorders (2003), 1

The sentence comprehension strategies used by children with speci®c language impairments (SLI) were examined within the framework of the Competition Model (Bates and MacWhinney, 1989). The experiment was ... [more ▼]

The sentence comprehension strategies used by children with speci®c language impairments (SLI) were examined within the framework of the Competition Model (Bates and MacWhinney, 1989). The experiment was a replication of Kail and Charvillat'experiment (1988) designed to investigate the use of different morphosyntactic cues (i.e. word order, clitic pronoun, verbal agreement) in sentence comprehension by children (4;6 ± 6;6) with normal language development. They found that French speaking children used mainly information on word order with a lesser reliance on the other cues (word order4clitic pronoun4verbal agreement). In the present study, the same experiment was replicated with 25 French speaking children with SLI. The results suggested that children with SLI had speci®c di culties in processing clitic pronouns, while verbal agreement could be processed (word order4verbal agreement4clitic pronoun). This pattern seems to be a speci®c strategy and not simply a delayed pro®le. In addition, our results were compatible with a theoretical account in terms of limitation in processing capacities. [less ▲]

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See detailCompte-rendu de l'ouvrage de I. Loudon (ed.) : Western Medicine. An Illustrated History
Nissen, Cécile ULg

in Archives Internationales d'Histoire des Sciences (2003)

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See detailPion Structure Function and violation of the Momentum Sum Rule
Lansberg, Jean-Philippe ULg; Bissey, F.; Cudell, Jean-René ULg et al

in Blin, A. H.; Hiller, B.; Ruivo, M. C. (Eds.) et al Hadron Physics: Effective Theories of Low Energy QCD N°2 (2003)

We present a method to evaluate the pion structure functions from a box diagram calculation. Pion and constituent quark fields are coupled through the simplest pseudoscalar coupling. The gamma^* pi -> q ... [more ▼]

We present a method to evaluate the pion structure functions from a box diagram calculation. Pion and constituent quark fields are coupled through the simplest pseudoscalar coupling. The gamma^* pi -> q \bar q cross-section is evaluated and related to the structure functions. We then show that the introduction of non-perturbative effects, related to the pion size and preserving gauge invariance, provides us with a straighforward relation with the quark distribution. It is predicted that higher-twist terms become negligible for Q^2 larger than about 2 GeV^2 and that quarks in the pion have a momentum fraction smaller than in the proton. We enlarge the discussion concerning this violation of the momentum sum rule, emphasizing that the sum rule is recovered in the chiral limit and also when the finite size condition is not imposed. [less ▲]

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See detailCharacterization of UDP-glucose : protein transglucosylase genes from potato.
Wald, F. A.; Kissen, R.; du Jardin, Patrick ULg et al

in Plant Molecular Biology (2003), 52

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See detailConsidérations sur la rémunération en tant qu'objet de recouvrement
Georges, Frédéric ULg

in Espace judiciaire et social européen (2003)

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See detailPréface à "Adolescents en difficultés"
Born, Michel ULg

in Collectif (Ed.) Adolescents en difficultés (2003)

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See detailRegistration-based solutions to the range-dependence problem in radar STAP
Lapierre, Fabian D.; Verly, Jacques ULg

Conference (2003)

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See detailLe médicament du mois Le voriconazole (Vfend).
Pierard, Gérald ULg; Arrese Estrada, Jorge ULg; Quatresooz, Pascale ULg et al

in Revue Médicale de Liège (2003), 58(5), 351-5

Invasive fungal infections are a rare but important cause of morbidity and mortality among patients with severely compromised host defenses. Despite considerable advances in antifungal therapies over the ... [more ▼]

Invasive fungal infections are a rare but important cause of morbidity and mortality among patients with severely compromised host defenses. Despite considerable advances in antifungal therapies over the past years, invasive mycoses remain a stubborn and dramatic problem. Voriconazole is a new triazole antifungal agent which confers a relative survival benefit in fluconazole-resistant invasive candidiasis, and in invasive aspergillosis, fusariosis and Scedosporium infections as well. [less ▲]

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See detailAmmonium sulphate as promoting agent of the sulphidization process of oxidized Cu-Co ores from the Luiswishi deposit (RDC)
Bastin, David ULg; Frenay, Jean ULg; Philippart, Pierre

Poster (2003)

The Luiswishi deposit belongs to the Cu-Co deposits of the Southern Group of the Katangian Copper Belt and is operated by a joint venture between EGMF (Entreprises Générales Malta Forrest) and Gecamines ... [more ▼]

The Luiswishi deposit belongs to the Cu-Co deposits of the Southern Group of the Katangian Copper Belt and is operated by a joint venture between EGMF (Entreprises Générales Malta Forrest) and Gecamines (Générale des Carrières et des Mines). The Cu-Co ore is beneficiated by the sulphidization process at the NCK (New Concentrator of Kipushi) at Kipushi. Sulphidization followed by flotation with sulphydryl collectors is a common practice for the treatment of oxidized base metals ores. This process is complex and its application at the industrial scale is quite sensitive. In Central Africa it is also a cost intensive treatment as the sulphidizing agent has to be imported. In order to improve the metallurgical performances and to optimise the economics of the process, a laboratory research program was carried out by the Laboratory of Metallurgy and Mineral Processing (MTM) of the University of Liège in close collaboration with EGMF and Gecamines. This program included the study of various flotation reagents as dispersing, depressing and activating agents. This paper presents the results obtained with the use of ammonium sulphate as activator of the sulphidized xanthate flotation. Although ammonium sulphate has been mentioned in the literature as a promoting agent of the sulphidized xanthate flotation of malachite, its effects on the flotation of cobalt oxides was not known. The testworks were carried out on various oxidized siliceous ore types from the Luiswishi deposit. A 1.7 l Agitair laboratory flotation cell was used. NaHS and potassium amylxanthate were respectively choosen as sulphidizer and collector. A mixture of gasoil and tall oil (90/10) was used as secondary collector. A multistage sulphidization was realised. Values of pH were followed during the different tests and an ion selective electrode Ag/Ag2S was used to control the Es potentiel evolution during the stepwise addition of the sulphidizer. The addition of ammonium suphate [(NH4)2SO4] simultaneously with NaHS led to the following results: -A marked improvement of the sulfidization kinetics leading to shorter conditioning times and limiting the number of sulphidizing stages required to reach maximum recoveries. -The inhibition of the depressive effect on Cu and Co flotation of an excess of hydrosulphide ions in the pulp. -An improvement of the selectivity of the flotation combined with higher cobalt recoveries. The promoting effect is indeed more effective for cobalt than for copper and cobalt recoveries were improved by 4 to 8 %. -A significant decrease of the sulfidizer consumption. These laboratory results were implemented at an industrial scale at the NCK at Kipushi. In close accordance with the laboratory results the sulphidization kinetics were improved and the cobalt recoveries rose by 7 % while maintaining the previous Cu and Co grades of the concentrate. Ammonium sulphate being a low cost and common reagent (it is easily found in the fertiliser industry or as a byproduct of the coke industry), its use significantly improved the economics of the flotation of Cu-Co oxides ores from the Luiswishi deposit. [less ▲]

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See detailInsertion Of X-Ray Structures Of Proteins In Membranes
Basyn, F.; Spies, B.; Bouffioux, O. et al

in Journal of Molecular Graphics & Modelling (2003), 22(1), 11-21

Few structures of membrane proteins are known and their relationships with the membrane are unclear. In a previous report, 20 X-ray structures of transmembrane proteins were analyzed in silico for their ... [more ▼]

Few structures of membrane proteins are known and their relationships with the membrane are unclear. In a previous report, 20 X-ray structures of transmembrane proteins were analyzed in silico for their orientation in a 36A-thick membrane [J. Mol. Graph. Model. 20 (2001) 235]. In this paper, we use the same approach to analyze how the insertion of the X-ray structures varies with the bilayer thickness. The protein structures are kept constant and, at each membrane thickness, the protein is allowed to tilt and rotate in order to accommodate at their best. The conditions are said to be optimal when the energy of insertion is minimal. The results show that most helix bundles require thicker membranes than porin barrels. Moreover, in a few instances, the ideal membrane thickness is unrealistic with respect to natural membranes supporting that the X-ray structure requires adaptation to stabilize in membrane. For instance, the squalene cyclase could adapt by bending the side chains of its ring of lysine and arginine in order to increase the hydrophobic surface in contact with membranes. We analyzed the distribution of amino acids in the water, interface and acyl chain layers of the membrane and compared with the literature. [less ▲]

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See detailContribution à la mise au point d'une méthode de lutte biologique contre la maladie des pourritures de la couronne de la banane
Lassois, Ludivine ULg

Master's dissertation (2003)

The antagonist activity of two yeast strains (Pichia anomala K strain and Candida oleophila O strain) against the parasitic complex responsible for crowns rot of banana has been evaluated. Their ... [more ▼]

The antagonist activity of two yeast strains (Pichia anomala K strain and Candida oleophila O strain) against the parasitic complex responsible for crowns rot of banana has been evaluated. Their efficiency has been tested on three separated fungi : Colletotrichum musae, Fusarium moiliforme, Cephalosporium sp. and on a parasitic complex formed by the association of these three fungi. Antagonist effects have been observed both on the two first fungi and on the complex. Strain O added at 108 ufc/ml on crowns which were previously inoculated with the complex showed the highest protection (56,0 %). This protection was superior to those observed against the fungi inoculated separately. The influence of the time between the addition of the O strain (108 ufc/ml) and the inoculation of the pathogens on the level of protection has also been measured. It appeared that protection by the O strain was remarkably reinforced when the strain was added 24 hours before the complex (57,0 %). This, in comparison with the additions performed 15 minutes or 3 hours after the pathogens inoculation. The utilisation of the O strain at 108 ufc/ml has been combined with the utilisation of 50μm polybags. These latter allow the formation of a modified atmosphere during the length of the bunches transfer. The protection level was at 61,0% when both methods were combined whereas protection by the yeast alone was of 41,0%. A strict correlation between the severity of the symptoms and the protection by the yeast has been highlighted. When the severity of the disease increases, protection by the yeast decreases. [less ▲]

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See detailAssessment of microbiological criteria for regular checks of faecal contamination and general hygiene in Belgian establishments producing meat
Ghafir, Yasmine; Daube, Georges ULg; Dierick, Katleen et al

in Sciences des Aliments (2003), 23(1), 104-106

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See detailThe cold atom micromaser in a vertical configuration
Martin, John ULg; Bastin, Thierry ULg

Poster (2003)

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See detailPreparation of nanosized barium zirconate powder by thermal decomposition of urea in an aqueous solution containing barium and zirconium, and by calcination of the precipitate
Boschini, Frédéric ULg; Robertz, B.; Rulmont, André ULg et al

in Journal of the European Ceramic Society (2003), 23(16), 3035-3042

The synthesis of barium zirconate was initiated by urea induced homogeneous precipitation followed by a "low temperature" thermal treatment. The kinetic of the reaction and the optimum urea/cation ratio ... [more ▼]

The synthesis of barium zirconate was initiated by urea induced homogeneous precipitation followed by a "low temperature" thermal treatment. The kinetic of the reaction and the optimum urea/cation ratio have been determined by means of X-ray diffraction and Inductive Coupled Plasma analyses. It has been demonstrated that an amorphous zirconium hydrated oxide starts to precipitate followed by the precipitation of barium carbonate. A calcination at 1200 degreesC during 2 h gives rise to the formation of a pure barium zirconate phase. Microstructural characterisations have been performed in order to evaluate the sintering behaviour. Dilatometric measurements, coupled with scanning electron microscopy analyses clearly indicate that barium carbonate decomposition process leads to the formation of internal porosity which severely limits the density of the material, even if a sintering was performed at 1500 degreesC. A careful control of the heating profile seems to be necessary in order to produce dense materials. (C) 2003 Elsevier Ltd. All rights reserved. [less ▲]

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See detailImpacts de l’augmentation de la concentration en CO2 atmosphérique sur la composition de la communauté microbienne en bactéries oxydant l’ammoniac du sol.
Malchair, Sandrine ULg

Master of advanced studies dissertation (2003)

Résumé du mémoire de DEA Il reste, actuellement, peu de doutes quant au fait que le climat à l’échelle de la Terre s’est modifié au XXème siècle. De nombreuses évidences suggèrent que ces changements sont ... [more ▼]

Résumé du mémoire de DEA Il reste, actuellement, peu de doutes quant au fait que le climat à l’échelle de la Terre s’est modifié au XXème siècle. De nombreuses évidences suggèrent que ces changements sont liés aux activités anthropiques qui ont accru la concentration atmosphérique en gaz à effet de serre, notamment celle en dioxyde de carbone. Cette augmentation de la concentration en dioxyde de carbone et les changements climatiques associés entraîneront des réponses complexes des écosystèmes. Bien qu’il soit établi que les microorganismes jouent un rôle clé dans le cycle des éléments nutritifs, les conséquences d’une telle augmentation de la concentration en CO2 pour les microbiota du sol sont inconnues. Le cycle de l’azote est particulièrement digne d’intérêt car l’azote est, après le carbone, l’élément le plus important pour la vie des plantes. La nitrification est l’étape clé du cycle de l’azote. En effet, elle influence la productivité primaire, peut causer l’acidification des sols et le lessivage de nitrates. De plus la disponibilité de l’azote dans les sols est un élément régulateur de l’immobilisation du carbone de l’écosystème dans la biomasse des plantes ou des microorganismes du sol. Ce mémoire étudie la composition de la communauté microbienne du sol en bactéries oxydant l’ammoniac (AOB) sous concentration en dioxyde de carbone ambiante ou élevée afin de vérifier si l’augmentation de la concentration en CO2 affecte la communauté de bactéries oxydant l’ammoniac. Ce mémoire s’intègre dans l’étude de l’effet d’une concentration en CO2 élevée sur la nitrification et la dénitrification potentielle (Carnol et al., 2002). Cette étude a nécessité quelques étapes préalables. En effet, il a été nécessaire de renouveler le stock de clusters contrôle (séquence caractéristique des AOB incluses dans des vecteurs). Ce stock a pu être renouvelé par transformation (électroporation) des cellules d’Escherichia coli. Bien que la migration de ces nouveaux clusters contrôle dans le gradient dénaturant diffère légèrement de celle des clusters de la littérature, nous pouvons affirmer, après séquençage, que ces clusters correspondent à ceux décrits dans la littérature. Ensuite, nous avons appliqué le protocole PCR employé pour amplifier les clusters contrôle à l’ADN extrait à partir de nos échantillons de sol lyophilisés. Il est apparu que les conditions prévalant pour l’amplification des clusters contrôle n’étaient pas applicables à nos échantillons de sol. En effet, des produits aspécifiques se sont formés et le rendement de la réaction était faible. C’est pourquoi nous avons optimisé la réaction de PCR. Les conditions permettant d’atteindre un bon compromis entre l’efficacité et la spécificité de la réaction pour nos échantillons ( en employant les amorces CTO spécifiques des AOB) sont les suivantes : température d’annealing de 59°C, concentration en amorce de 20 pmoles par réaction. Ces conditions conviennent aussi bien pour l’amplification pour l’amplification de l’ADN contenu dans les échantillons que pour celle des clusters contrôle. Enfin, nous avons envisagé l’étude de la composition de la communauté microbienne en AOB à partir des échantillons de sols lyophilisés issus de chambres sous concentration en CO2 ambiante ou élevée. Nous avons testé la reproductibilité des techniques employées c’est à dire celle des extractions d’ADN génomique réalisées à partir de nos échantillons et celle de la PCR ; Nous avons, également, étudié la variabilité de la composition de la communauté microbienne en AOB au sein d’une chambre ; Pour finir, nous avons envisagé l’effet possible de l’augmentation de la concentration en CO2 sur la composition de la communauté microbienne en AOB. Il apparaît que, bien que le rendement des extractions génomiques ne soit pas reproductible, cette différence influence peu le pattern de bandes révélées pour la DGGE du point de vue des clusters dominants. De plus, bien que les amplifications d’ADN par PCR à partir des échantillons soient également variables du point de vue de la spécificité et du rendement, cette différence a peu d’impacts sur le pattern de bandes révélées par la DGGE si la PCR permet une amplification suffisante de l’ADN. Cela montre l’importance de l’optimisation de la réaction avant toute nouvelle expérimentation. On a pu constater qu’il n’y a pas de variabilité de la composition de la communauté microbienne en AOB au sein d’une chambre. Cependant, un changement de la composition de la communauté microbienne en AOB a été observé dans les couches de sol exposées trois ans à une teneur en CO2 élevée. Ce changement n’est pas perceptible pour les couches exposées une seule année au traitement. L’exposition longue à une concentration en CO2 supérieure entraîne la disparition des clusters I, II et III. En conclusion, il a été possible de renouveler notre stock de clusters contrôle. L’ADN cible spécifique des AOB est amplifiable par PCR. Cependant, il apparaît que les protocoles PCR ne sont pas transposables. C’est pourquoi, il est nécessaire d’optimiser la réaction de PCR. Le pattern de bandes DGGE est représentatif de la de la composition de la communauté microbienne en AOB si l’ADN amplifié est en quantité et de qualité suffisantes. Aucune variabilité de la composition de la communauté microbienne en AOB n’a été observée au sein d’une chambre. Une exposition longue à un concentration élevée en dioxyde de carbone, contrairement à une exposition de courte durée, modifie la composition de la communauté microbienne en AOB. [less ▲]

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See detailTrou Al'Wesse : Rapport préliminaire des fouilles 2003
Miller, Rebecca ULg; Otte, Marcel ULg

in Notae Praehistoricae (2003), 23

This article presents a summary of the first field season of the second phase of excavations at the site of Trou Al'Wesse as well as proposing a series of hypotheses concerning possible contacts between ... [more ▼]

This article presents a summary of the first field season of the second phase of excavations at the site of Trou Al'Wesse as well as proposing a series of hypotheses concerning possible contacts between Mesolithic and Neolithics populations. [less ▲]

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See detailL'enseignement en Communauté française : un haut degré d'iniquité
Baye, Ariane ULg; Nicaise, Julien; Straeten, Marie-Hélène et al

in Espace de Libertés : Magazine du Centre d'Action Laïque (2003), (316), 16-17

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See detailObservations sous Anvers, 12 septembre 2002
Boularbah, Hakim ULg; Marquette, V.

in Revue de Droit Commercial Belge [= RDC] = Tijdschrift voor Belgisch Handelsrecht [=TBH] (2003)

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See detailMesoscale surface distribution of biogeochemical characteristics in the Crozet Basin frontal zones (South Indian Ocean)
Fiala, M.; Delille, Bruno ULg; Dubreuil, C. et al

in Marine Ecology. Progress Series (2003), 249

A mesoscale study was conducted in January and February 1999 in the Crozet Basin frontal zones (43degrees50' to 45degrees20'S, 61degrees00' to 64degrees30'E) within the southernmost and easternmost ... [more ▼]

A mesoscale study was conducted in January and February 1999 in the Crozet Basin frontal zones (43degrees50' to 45degrees20'S, 61degrees00' to 64degrees30'E) within the southernmost and easternmost convergence area of the Antarctic Circumpolar Current (ACC) and the Agulhas Return Current (ARC). Distribution of biogeochemical parameters was strongly linked to the merged Subtropical (STF) and Subantarctic (SAF) Fronts which mark the border between the cold and less saline subantarctic waters and the warm and more saline subtropical waters. This survey took place during a post-bloom period. Chlorophyll a concentrations were low throughout the study area ranging from 0.2 mug l(-1) in the Polar Frontal Zone (PFZ) to 0.4 mug l(-1) in the Subtropical Zone (STZ). Maximum chlorophyll a values (0.8 mug l(-1)) associated with an increase in biogenic silica concentration (from 0.03 to 0.34 muM) and a diatom peak (1.2 x 10(5) cells l(-1)) were encountered in the northeastern part of the STF edge. Despite northwardly decreasing concentrations of nitrates from 14 muM in the PFZ to 6 PM in the STZ, they were not the main factor limiting phytoplankton growth. Low silicic acid (mean = 0.6 muM) could have limited diatom development in the PFZ and the STZ where diatom numbers were low. In STZ waters, where average diatom numbers were highest, various species of Nitzschia and Thalassiothrix were common, but Pseudonitzschia spp. were dominant. Throughout the survey area, pico- and nano-sized cells dominated the phytoplankton assemblage, and their number was the highest in the STZ. Cyanobacteria, only present in subtropical waters >12.5degreesC, were the major component of the picoplankton size-fraction. While dinoflagellate numbers were low in the Subantarctic Zone (SAZ), their abundance and species numbers increased in the STZ, where Oxytoxum laticeps became dominant and several further large-size species of Prorocentrum, Ceratium and Gymnodinium appeared in addition to those at the STF. The distribution of different biogeochemical parameters suggests that the Crozet Basin frontal region is a non-exporting system at the end of summer. During this post-bloom period, biological activity is low and phytoplankton growth severely limited. This is evidenced by the weak dependence of the partial pressure of carbon dioxide (pCO(2)) on biological activity and the importance of the air-sea exchange in maintaining pCO(2) close to saturation. [less ▲]

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