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See detailSynthesis of highly ordered mesoporous compounds with control of morphology using a non-ionic surfactant as template
Léonard, Alexandre ULg; Blin, J. L.; Su, B.-L.

in Studies in Surface Science and Catalysis (2002), 141

Highly ordered hexagonal mesostructures (CMI-1 compounds) can be obtained under mild acidic conditions by working at low concentrations of non-ionic decaoxyethylene cetyl ether [C16(EO)10]. The present ... [more ▼]

Highly ordered hexagonal mesostructures (CMI-1 compounds) can be obtained under mild acidic conditions by working at low concentrations of non-ionic decaoxyethylene cetyl ether [C16(EO)10]. The present work shows that it is possible to gain control at the nanometer scale over the packing symmetry of the channels, as well as at the micrometer level over the morphology of the particles by varying the surfactant / silica molar ratio and the hydrothermal treatment conditions. Very high loadings of silica precursors typically afford highly ordered hexagonal CMI-1 compounds whereas an increase of the surfactant / silica molar ratio results in materials with a more disordered channel array. In a parallel way, very low molar ratios of surfactant / silica lead to ropes, gyroids and toroids whereas spheres are the most stable shape with the lower quantities of silica. From this point, it appears thus that not only the structure but also the morphologies encountered for MCM-41 type mesoporous silica can be reproduced with a non-ionic templating agent. [less ▲]

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See detailLes Troyens à Métaponte : Etude d'une nouvelle Ilioupersis de la céramique italiote.
Morard, Thomas ULg

Book published by Von Zabern (2002)

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See detailLiquidation des créances et récompenses au titre d'investissements immobiliers
Leleu, Yves-Henri ULg

in Leleu, Yves-Henri; Casman, Hélène; Verbeke, Alain (Eds.) Le droit des régimes matrimoniaux en pratique (2002)

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See detailMerits of the multivariate Dale model in genetic association studies
Van Steen, Kristel ULg; Molenberghs, G.; Tahri, N.

in Genetic Epidemiology (2002), 23

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See detailQuantitative dilatometric analysis of intercritical annealing in a low-silicon TRIP steel
Zhao, Lie; Kop, T. A.; Rolin, Valéry et al

in Journal of Materials Science (2002), 37

In this work, an evaluation method to calculate the austenite fraction during continuous heating and isothermal annealing from dilatometric data is proposed. By means of a single reference measurement to ... [more ▼]

In this work, an evaluation method to calculate the austenite fraction during continuous heating and isothermal annealing from dilatometric data is proposed. By means of a single reference measurement to determine a scaling factor correcting for experimental errors, a framework is created to determine the austenite fraction as a function of time and temperature. In the evaluation of the dilatometric data the effect of the changing carbon concentration in austenite phase is taken into account. The method is applied to dilatometric data for a 0.16C-1.5Mn-0.4Si (wt%) low-silicon transformation induced plasticity (TRIP) multiphase steel. Three typical dilatometric data are obtained by heating the material to 750°C, 800°C or 900°C, which leads to three different microstructures consisting of (1) ferrite, cementite and austenite, (2) ferrite and austenite and (3) full austenite, respectively. The calculated results using the proposed new method are compared with the results from thermodynamic analysis and those from quantitative microscopic analysis. Significant inter-test discrepancies are observed. [less ▲]

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See detailThe green lacewings in Belgium (Neuroptera : Chrysopidae)
Bozsik, Andras; Mignon, Jacques ULg; Gaspar, Charles

in Acta Zoologica Academiae Scientiarum Hungaricae (2002), 48(Suppl. 2), 53-59

There are merely three published sources of information on the green lacewings in Belgium. The first two were written by a Belgian and a Catalan author at the beginning of the 20th century and the third ... [more ▼]

There are merely three published sources of information on the green lacewings in Belgium. The first two were written by a Belgian and a Catalan author at the beginning of the 20th century and the third was published in 1980. Interestingly, the most recent study reported the fewest species (11), the most previous contained 12 and the second one showed 17 species, This confused situation and the paucity of data initiated the authors to identify the green lacewing collection of the Gembloux University of Agricultural Sciences, where lacewings from different parts of Belgium were preserved, and also to collect chrysopids regularly, Summarising the species reported in the literature and caught during sampling, 18 green lacewing species have been verified in Belgium: Nothochrysa fulviceps, Nothochrysa capitata, Hypochrysa elegans, Nineta flava, Nineta vittata, Nineta pallida, Chrysotropia ciliata, Chrysopa perla, Chrysopa dorsalis, Chrysopa abbreviata, Chrysopa formosa, Chrysopa phlyllochroma, Chrysopa pallens, Dichochrysa flavifrons, Dichochrysa prasina, Dichochrysa ventralis, Chrysoperla carnea, Cunctochrysa albolineata. Considering the known references, one species, Nineta pallida proved to be new for the Belgian fauna. [less ▲]

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See detailRelationship between markers of blood oxidant status and physiological variables in healthy and heaves-affected horses after exercise
Kirschvink, Nathalie; Art, Tatiana ULg; de Moffarts, Brieuc et al

in Equine Veterinary Journal. Supplement (2002), 34

Exercise-induced oxidative stress is investigated as a potential performance-limiting factor in human sports medicine. Therefore, the present study aimed to assess whether physiological variables that ... [more ▼]

Exercise-induced oxidative stress is investigated as a potential performance-limiting factor in human sports medicine. Therefore, the present study aimed to assess whether physiological variables that change with exercise intensity were correlated with blood oxidant markers in healthy and heaves-affected horses. Seven healthy horses, 8 heaves-affected in remission and 7 heaves-affected in crisis performed a standardised exercise test (SET) of stepwise increasing intensity. Variables monitored during exercise were heart rate (HR), venous plasma lactate (LA), packed cell volume (PCV) and arterial oxygen tension (PaO2). Oxidant markers (uric acid [UA], 8-iso-PGF2alpha and reduced [GSH] and oxidised glutathione [GSSG]) were analysed in venous peripheral blood sampled at rest (R), at peak-exercise intensity (Emax), 15 (E15) and 60 (E60) min after SET. There was a significant effect of heaves on oxidant markers and, therefore, correlation analyses between physiological variables and oxidant markers were performed separately per horse group. In healthy horses, UA analysed at Emax was positively correlated with LA. Furthermore, GSH analysed at Emax and E15 was positively correlated with PaO2. In healthy and heaves-affected horses in remission, GSH and GSSG determined at Emax were negatively correlated with HR. There was no significant correlation between 8-iso-PGF2alpha and physiological variables. In conclusion, a correlation between the physiological response to exercise and some oxidant markers exists in healthy horses. However, in heaves-affected horses the blood oxidant status is probably more dependant on airway disease than on exercise. Future studies should be undertaken to assess whether antioxidant supplementation might positively influence the oxidant-antiodidant balance in exercising horses. [less ▲]

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See detailSymmetry of neurography
WANG, François-Charles ULg; Horward, A.

Poster (2002)

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See detailComparison of the ability of three radioimmunoassay to detect pregnancy-associated glycoproteins in bovine plasma
Perenyi, Z. S.; Szenci, Otto; Sulon, Joseph ULg et al

in Reproduction in Domestic Animals (2002), 37(2), 100-104

Pregnancy-associated glycoproteins (PAGs) constitute a large family of glycoproteins that are synthesized in the superficial layer of the ruminant placenta according to a spatial and temporal expression ... [more ▼]

Pregnancy-associated glycoproteins (PAGs) constitute a large family of glycoproteins that are synthesized in the superficial layer of the ruminant placenta according to a spatial and temporal expression pattern. When PAGs are released in the maternal blood they can be used for pregnancy diagnosis, pregnancy follow-up and for the monitoring of the trophoblastic function. Three different radioimmunoassay systems (RIA 1, RIA 2 and RIA 3) using antisera produced against PAG I67 (RIA 1), PAG55+62 (RIA 2) and PAG55+59 (RIA 3) were used in this investigation in order to measure the PAG concentration in plasma samples withdrawn from pregnant cows and heifers during different periods following artificial insemination (AI). These systems were able to detect PAG molecules in the maternal blood as early as 21 days after AI in different concentrations (RIA 1: 0.43 +/- 0.24 ng/ml, mean +/- SD; RIA 2: 0.48 +/- 0.24 ng/ml; RIA 3: 0.64 +/- 0.37 ng/ml). On days 32 and 42 RIA 2 (4.30 +/- 1.32 ng/ml and 5.56 +/- 1.95 ng/ml) and RIA 3 (4.17 +/- 1.15 ng/ml and 5.60 +/- 1.89 ng/ml) presented significantly (p < 0.0001) higher PAG concentrations than those of RIA 1 (2.43 +/- 0.81 ng/ml and 4.01 +/- 1.48 ng/ml), respectively. After day 21, significant correlations (p < 0.0001; r >/= 0.929) were determined between the three systems. Additionally the three individual PAG profiles presented in this study showed that PAG molecules secreted in the maternal blood between 21 and 50 days after AI were better recognized by the RIA 2 and RIA 3 systems. This study clearly indicated that the ability of a RIA test to recognize PAG molecules in the maternal blood can be improved by carefully selecting the antiserum. [less ▲]

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See detailPrélèvement de l’isthme encéphalique pour la recherche de l’encéphalopathie spongiforme transmissible chez le mouton
Gabriel, Annick ULg; Jacobs, Christine ULg; Simoens, P.

in Annales de Médecine Vétérinaire (2002), 146(5), 295-300

Depuis le premier avril 2002, une directive de l'Union Européenne contraint la Belgique à tester les chèvres et les moutons, en plus des bovins, dans le cadre de la recherche d'encéphalopathie spongiforme ... [more ▼]

Depuis le premier avril 2002, une directive de l'Union Européenne contraint la Belgique à tester les chèvres et les moutons, en plus des bovins, dans le cadre de la recherche d'encéphalopathie spongiforme transmissible. Comme chez les bovins, le diagnostic est réalisé à partir d'un prélèvement de l'isthme encéphalique au niveau de l'obex. Des différences morphologiques entre l'isthme encéphalique des moutons et chèvres et celui des bovins ont nécessité quelques ajustements de la méthode de prélèvement. Dans cette étude, les particularités techniques du prélèvement et certaines caractéristiques morphologiques du cerveau ovin sont décrites. Les différences majeures, par rapport aux bovins, sont d'une part les dimensions plus petites, et d'autre part le rétrécissement caudal très marqué de l'isthme encéphalique. [less ▲]

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See detailBacillus anthracis
Boseret, Géraldine ULg; Linden, Annick ULg; Mainil, Jacques ULg

Learning material (2002)

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See detailRéplication, clivage-encapsidation et recombinaison de l'ADN des herpèsvirus
Schynts, Frédéric; Meurens, François; Muylkens, Benoît ULg et al

in Virologie (2002), 6

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See detailImplication of follicular dendritic cells in prion diseases
Defaweux, Valérie ULg

Master of advanced studies dissertation (2002)

In prion diseases, FDCs seem to be the major sites of extraneuronal cellular prion protein (PrPc) expression and the principal sites of the infectious agent (PrPres) accumulation in lymph organs. Two ways ... [more ▼]

In prion diseases, FDCs seem to be the major sites of extraneuronal cellular prion protein (PrPc) expression and the principal sites of the infectious agent (PrPres) accumulation in lymph organs. Two ways of research has been considered: firstly, a new monoclonal antibody directed against bovine follicular dendritic cells (FDC-B1) developed in our laboratory has been characterised. We have shown that the antigen detected by FDC-B1 is expressed exclusively on FDCs surface of ruminants’ lymphoid organs. This protein seems to be a membrane glycoprotein of more or less 28 kDa whose sequence will be soon under determination. FDC-B1 will be a precious tool to detect FDC implication in scrapie infected sheep and in bovine spongiform affected cows. Secondly, the expression of PrPc isoforms has been analysed on bovine FDC depleted and enriched fractions and has been compared to bovine brain extracts. We demonstrated variation in the PrPc patterns of glycosylation between bovine FCD depleted and enriched cell populations. Moreover, glycosyl residues seemed to be different between immune and neuronal PrPc. As interaction of PrPc and PrPres appears to be a crucial pathogenic step promoted by homology, variation in PrPc glycoforms could explain the absence of infectivity in most bovine lymph organs affected by bovine spongiform encephalopathy. [less ▲]

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See detailComment gérer la police dans une période de changement?
Schoenaers, Frédéric ULg

in Revue Française de Gestion (2002), 3-4(139),

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See detailIncreased Cell Proliferation, But Not Reduced Cell Death, Induces Lymphocytosis In Bovine Leukemia Virus-Infected Sheep
Debacq, C.; Asquith, B.; Kerkhofs, P. et al

in Proceedings of the National Academy of Sciences of the United States of America (2002), 99(15),

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See detailArterial revascularization therapy study: a randomized trial of stenting in multivessel coronary disease versus bypass surgery. 3 year results
Legrand, Victor ULg; Serruys, P. W. S.; Bilocleau, L. et al

in European Heart Journal (2002), 23(Suppl. S), 263-263

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