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See detailFlüssig-Flüssig-Extraktion: Vom Laborexperiment zur Technikumsanlage
Henschke, M; Pfennig, Andreas ULg

Conference (1998, September 21)

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See detailHet Nederlands in Vlaanderen: van taalzorg naar taalbewustzijn
Vromans, Joseph ULg

Conference given outside the academic context (1998)

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See detailCommunication intitulée "La Philosophie Politique des Actions Positives"
Martiniello, Marco ULg

Scientific conference (1998, September 18)

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See detailLa Philosophie Politique des Actions Positives
Martiniello, Marco ULg

Scientific conference (1998, September 18)

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See detailDépopulation de la Ville de Liège et diffusion périurbaine : quels processus pour quelles pistes de solutions ?
Halleux, Jean-Marie ULg

Conference given outside the academic context (1998)

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See detailDecreased Protein Levels of the C-Cbl Protooncogene in Murine Aids
Trebak, Mohamed; Lambert, Charles A; Rahmouni, Souad ULg et al

in Cellular Immunology (1998), 188(2), 151-7

Murine acquired immunodeficiency syndrome (MAIDS) can be viewed as a lymphoproliferative disease which involves B cells as well as T cells from spleen and lymph nodes while thymus and Peyer's patches do ... [more ▼]

Murine acquired immunodeficiency syndrome (MAIDS) can be viewed as a lymphoproliferative disease which involves B cells as well as T cells from spleen and lymph nodes while thymus and Peyer's patches do not participate in the process. The 120-kDa protooncogene product c-Cbl was initially cloned from the murine Cas NS-1 B cell lymphoma. It is a main target of immunoreceptor (TCR and BCR)-mediated protein tyrosine kinase activity. Moreover, recent data suggest that c-Cbl might play a crucial role in the regulation of cell proliferation through regulation of GTP-binding proteins. Therefore, the involvement of c-Cbl was evaluated in the lymphoproliferative disease induced by the MAIDS virus. The expression of the c-Cbl protein was dramatically reduced in the lymph node of infected mice while it remained normal in the thymus. In contrast, the expression of actin, TCR-zeta chain, ZAP-70, and p59(fyn) remained similar in controls and infected mice. Identical results were obtained with sorted B cells and T cells. Surprisingly, a B cell lymphoma line derived from late stage MAIDS mice displayed a normal level of c-Cbl. [less ▲]

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See detailSimultaneous Determination of Methylphenobarbital Enantiomers and Phenobarbital in Human Plasma by on-Line Coupling of an Achiral Precolumn to a Chiral Liquid Chromatographic Column
Ceccato, Attilio ULg; Boulanger, Bruno ULg; Chiap, Patrice ULg et al

in Journal of Chromatography. A (1998), 819(1-2), 143-53

A fully automated liquid chromatographic (LC) method for the simultaneous determination of methylphenobarbital enantiomers and phenobarbital in human plasma has been developed. The method is based on the ... [more ▼]

A fully automated liquid chromatographic (LC) method for the simultaneous determination of methylphenobarbital enantiomers and phenobarbital in human plasma has been developed. The method is based on the use of a precolumn packed with an internal-surface reversed-phase packing material (LiChrospher ADS) for sample clean-up coupled to LC analysis on a cellulose tris(4-methylbenzoate) based chiral stationary phase (Chiralcel OJ-R). A 100-microliter plasma sample was injected directly on the precolumn packed with LiChrospher RP-18 ADS using a mixture of pH 5.0 phosphate buffer-methanol (97:3, v/v) as washing liquid. The analytes were then eluted in the back-flush mode with the LC mobile phase. The enantiomeric separation of methylphenobarbital was achieved on Chiralcel OJ-R). The retention times were modelled using a D-optimal design with ten experimental points in order to optimise the LC mobile phase for the separation of phenobarbital from the enantiomers of mephobarbital. The factors selected were the acetonitrile content, the pH and the sodium perchlorate concentration in the mobile phase. A Derringer's desirability function was used to find an optimal and robust solution within the experimental domain. The mobile phase selected consisted of a mixture of pH 7.0 phosphate buffer-acetonitrile (60:40, v/v). The elution profiles of phenobarbital, methylphenobarbital and blank plasma samples on the precolumn and the time needed for analyte transfer from the precolumn to the analytical column were then determined. Finally, the method developed was validated. [less ▲]

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See detailSimulations calibrées sur des essais de traçages en vue de la détermination de zones de protection
Dassargues, Alain ULg

Scientific conference (1998, September 11)

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See detailL'immersion linguistique en milieu scolaire : De l'utilité de l'apprentissage précoce des langues étrangères
Comblain, Annick ULg

in Comblain, Annick (Ed.) Proceedings des Entretiens de Bichat partim Ortophonie (1998, September 11)

Il est superflu, aujourd’hui, d’insister sur la nécessité tant individuelle que culturelle mais surtout économique de connaître une ou plusieurs langues étrangères. Face à cet état de fait, il est ... [more ▼]

Il est superflu, aujourd’hui, d’insister sur la nécessité tant individuelle que culturelle mais surtout économique de connaître une ou plusieurs langues étrangères. Face à cet état de fait, il est souhaitable de fournir aux jeunes enfants les meilleures opportunités d’apprendre une seconde langue de manière intensive dans leur cursus scolaire. Les préoccupations scientifiques sur les divers aspects du bilinguisme ne sont pas neuves. Depuis plusieurs décennies, les psychologues, les éducateurs et les sociologues s’interrogent sur les effets individuels et sociaux de la pratique de plusieurs langues. Ce n’est cependant que récemment qu’une réflexion sérieuse sur les méthodes et les contextes de cet apprentissage linguistique est née. La raison en est, sans nul doute, le sentiment généralement partagé de l’inefficacité de l’apprentissage traditionnel des langues. Sur le modèle de ce qui se fait au Canada depuis plus d'un quart de siècle, la Belgique est un des rares pays a avoir, du moins à titre expérimental, introduit l’immersion dans son système scolaire et ce depuis 10 ans maintenant. Les avantages de l’enseignement immersif sont évidents : précocité et intensité d’exposition à la langue cible, caractère motivant et fonctionnel de la pratique linguistique. Les inconvénients, avec des enfants normaux sont nuls ainsi que l’attestent un grand nombre d'études canadiennes. La pratique immersive n’est un embarras ni pour le développement des capacités et des connaissances en langue maternelle, ni pour la maîtrise des matières inscrites au programme scolaire . Au terme de la scolarité secondaire, les enfants immergés présentent d’impressionnantes capacités discursives en langue seconde tant d’un point de vue réceptif que productif. Ces capacités discursives, bien qu’encore inférieures à celle de locuteurs natifs du même âge, sont très nettement supérieures à celles des enfants ayant suivi un enseignement traditionnel. Les résultats obtenus par la méthode immersive semblent donc de nature à améliorer de manière considérable les capacités linguistiques des enfants. Un certain nombre de recherches sont cependant encore nécessaires afin de préciser les modalités optimales de l’apprentissage des langues étrangères dans les contextes éducatifs. [less ▲]

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See detailLe froment d'hiver
Couvreur, Luc; Bodson, Bernard ULg; Herman, Jean-Luc et al

in Fumure et protection phytosanitaire des céréales: Informations avant les semis des céréales (1998, September 10)

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See detailEscourgeon et Orge d'hiver fourragère
Bodson, Bernard ULg; Herman, Jean-Luc; Monfort, Bruno et al

in Fumure et protection phytosanitaire des céréales: Informations avant les semis des céréales (1998, September 10)

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See detailCloches et carillons dans les Principautés de Liège et Stavelot-Malmedy: problèmes et voies de recherche
Marganne, Marie-Hélène ULg; Mélard, Marc

Conference given outside the academic context (1998)

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See detailAdverse effect of hyperinsulinemia on cardiovascular risk profile in middle-aged belgian population
Saint-Remy, Annie ULg; Scheen, André ULg; LEFEBVRE, Pierre ULg et al

Conference (1998, September 04)

Adverse effect of hyperinsulinemia on cardiovascular risk profile in middle-aged belgian population A.Saint-Remy, A. Scheen, M. Jeanjean, P. Lefèbvre, G. Rorive Nephrology-Hypertension, University ... [more ▼]

Adverse effect of hyperinsulinemia on cardiovascular risk profile in middle-aged belgian population A.Saint-Remy, A. Scheen, M. Jeanjean, P. Lefèbvre, G. Rorive Nephrology-Hypertension, University hospital, B35 sart Tilman, Liège, Belgium Objectives: assuming that insulin levels are reliable markers of insulin resistance, are increased fasting and/or postload insulinemia good predictors of an adverse cardiovascular risk profile in epidemiological studies? Method: in the MONICA project a random sample of 1631 subjects (35-64 years old) living in the province of Luxemburg, free of antihypertensive drugs and hypoglycemiant agents were submitted to an oral glucose tolerance test (OGTT). Blood samples for insulin (ins) and glucose were drawn at 0 and 2 hours, were available: total cholesterol (TC, HDL-cholesterol (HDL-C), triglycerides (TG), blood pressure (BP), BMI. Individuals were classified in 2 groups according to their level of fasting and 2 h insulinemia being either lower (group 1) or higher (group 2) than the 90th percentile value of the distribution of insulinemia. Results: Comparisons between groups show that mean BP, BMI, glycemia, TC and TG are higher (p<0.0001) in group 2 while HDL-C is significantly lower. In group 2, hypertension is 2 times more frequent than in group 1. Same observations are made for obesity (4 times more), impaired glucose tolerance, diabetes (10 times), high TG (3 times) and low rate of HDL-C (4 times). Insulin levels correlate significantly with BP and lipids. In group 1, people are generally affected by no more than 1cv risk factor, whereas cumulation of 2-3 and more risk factors is significantly more frequent in group 2 where 8.4 % of individuals exhibit hypertension with obesity, diabetes and dyslipidemia. Comparisons between the group 1 and other groups characterized by increased either fasting or postload insulin strongly suggest that an isolated increase of fasting insulin is already associated with an adverse cv risk profile. Conclusions: Unquestionably the OGTT with measurement of fasting and 2 hours postload insulinemia allows, in population studies, to identify people with a significant increase of major cardiovascular risk factors when hypersinulinemia is diagnosed. Our results indicate that already fasting insulinemia level is a good predictor of our observations. [less ▲]

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See detailLe traitement des infections artérielles. Apport de l’allogreffe
LAVIGNE, Jean-Paul ULg

Doctoral thesis (1998)

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See detailObservation of short and long timescale variability of the jovian UV aurora
Grodent, Denis ULg; Gérard, Jean-Claude ULg; Dols, V. et al

in Bulletin of the American Astronomical Society (1998, September 01)

Three sets of Hubble Space Telescope far-ultraviolet images of Jupiter's North pole aurora have been obtained with the Wide Field and Planetary Camera 2 in June 1996, May 1997 and August 1997. The ... [more ▼]

Three sets of Hubble Space Telescope far-ultraviolet images of Jupiter's North pole aurora have been obtained with the Wide Field and Planetary Camera 2 in June 1996, May 1997 and August 1997. The exposure time was limited to 160 seconds in order to reveal short timescale auroral features that are normally averaged during longer exposures and blurred by the rapid jovian rotation. The 3 sets of images show the aurora in a comparable (quiet) activity level, exhibiting long term persistent features such as : (i) a stable thin morning arc, (ii) a morning-afternoon emission dichotomy, (iii) a minimum of low latitude emission around CML=175 deg, (iv) bright localized afternoon structures. The equatorward boundary of the arc closely follows but is not coincident with the footprint of the 20 RJ magnetic field line given by the VIP4 model. These stable structures contrast with rapidly changing features like small size spots blasting in one single image, bright regions connecting trans-auroral structures, and the inner diffuse emission. The question of temporal variability and spatial extent of the auroral features is of major importance in understanding the origin and acceleration mechanisms of the auroral particles exciting the jovian UV aurora. In particular, short timescale processes can be related to field aligned currents generating acceleration structures and discrete aurora. [less ▲]

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