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See detailUltrastructural morphology of the male and female genital tracts of Psoroptes spp. (Acari : Astigmata : Psoroptidae)
Lekimme, Mireille ULg; Leclercq-Smekens, M.; Devignon, C. et al

in Experimental & Applied Acarology (2005), 36(4), 305-324

The structure of the male and female genital systems of the astigmatid mite Psoroptes ovis (Hering) is described. The male genital system is composed of a paired testis, fused at its proximal part, two ... [more ▼]

The structure of the male and female genital systems of the astigmatid mite Psoroptes ovis (Hering) is described. The male genital system is composed of a paired testis, fused at its proximal part, two vasa deferentia, an ejaculatory duct, into which a single accessory gland opens, and a copulatory organ. The testis is characterized by a peripheric syncytial cell surrounding spermatogonia, spermatocytes, spermatids and spermatozoa which are distributed regularly in the gonad according to the sequence of spermatogenesis. The female genital system consists of a copulatory pore (the bursa copulatrix), a seminal receptacle, paired ovaries and oviducts, a glandular uterus and an ovipositor which leads to the oviporus. Ovaries are composed of somatic cells, germ cells and a central cell, with a multilobular nucleus, connected to oocytes by a stalk. Similarities with other astigmatic mites belonging to Psoroptidia and Acaridia are also discussed. [less ▲]

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See detailRessources humaines et marketing: un mariage stratégique
Robert, Jocelyne ULg

Article for general public (2005)

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See detailLe règlement collectif de dettes - Synthèse des acquis à la lumière de la jurisprudence récente.
Grella, Vanessa ULg

in de Leval, Georges (Ed.) Actualités en droit judiciaire (2005)

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See detailNovel diagnostic approach to carpal tunnel syndrome
WANG, François-Charles ULg; GERARD, Pascale ULg; ISERENTANT, Cynthia ULg

Scientific conference (2005, December)

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See detailLe règlement collectif de dettes - Synthèse du droit nouveau
Grella, Vanessa ULg; de Leval, Georges ULg

in de Leval, Georges (Ed.) Actualités en droit judiciaire (2005)

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See detailOptimization of poly(2-(dimethylamino)ethyl methacrylate)-co-poly(ethyleneglycol)/DNA complexes designed for cell transfection
Grandfils, Christian ULg; Emonds-Alt, J.

in Minerva Biotecnologica (2005), 17(4), 237-243

Cell transfection relies upon the delivery of genomic material within cells in order to express selected DNA sequences. Non-viral gene delivery systems are preferable over viral vectors for several ... [more ▼]

Cell transfection relies upon the delivery of genomic material within cells in order to express selected DNA sequences. Non-viral gene delivery systems are preferable over viral vectors for several reasons: biosafety, low immunogenicity, higher loading capacity, and easiness of production. Their major drawbacks actually are their limited efficiency in vivo compared to viruses, their cytotoxicity and the fact that they are rapidly cleared up from the bloodstream. The aim of our study was to better characterize the physico-chemical behavior of the polycations based on poly(2-(dimethylamino)ethyl methacrylate)-co-poly(ethyleneglycol) and to control the formulation step to produce the polyelectrolyte complexes. [less ▲]

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See detailMise en oeuvre du réseau Natura 2000 en Wallonie: Finalisation de la typologie WALEUNIS et synthèse des états de conservation, critères de restauration et mesures de gestion pour les milieux rocheux et pelouses calaminaires
Graitson, Eric ULg; Rouxhet, Serge ULg; Guillitte, Olivier ULg

Report (2005)

Résumé exécutif - Le premier volet de ce programme de travail a été consacré à la finalisation de la typologie WALEUNIS ainsi qu'en l'alimentation d'une base de données phytosociologiques pour ces milieux ... [more ▼]

Résumé exécutif - Le premier volet de ce programme de travail a été consacré à la finalisation de la typologie WALEUNIS ainsi qu'en l'alimentation d'une base de données phytosociologiques pour ces milieux. Il ressort de cette première partie que les données relatives aux milieux rocheux sont peu nombreuses en Région wallonne contrairement aux pelouses calaminaires pour lesquelles les travaux scientifiques sont abondants. Les principales modifications ont porté sur la typologie des milieux rocheux. Un second volet a consisté en l'établissement d'une méthode objective d'évaluation de l'état de conservation, en la proposition de critères pour la restauration de ces habitats et en une synthèse des mesures de gestion. Cette étude a permis de mettre en évidence que les critères utiles à l'évaluation de l'état des pelouses calaminaires et des milieux rocheux sont moins nombreux que pour les autres types d'habitats naturels présents en région wallonne, principalement en raison de la stabilité de leur végétation. Les critères proposés pour l'évaluation de l'état de conservation appartiennent à trois catégories: structure spatiale, structure et fonctionnement de l'écosystème, perturbations anthropiques. L'évaluation de la représentativité de l'habitat (sur base de la présence des espèces végétales typiques) doit permettre de dégager des priorités en matière de restauration de ces milieux. Les mesures de gestion (habituellement légères) et de restauration (qui peuvent être plus conséquentes) à mettre en œuvre dans ces habitats doivent prendre en compte leur origine. Les données récoltées au cours de cette étude ont été utiles à la réalisation de cahiers d'habitats pour les pelouses calaminaires et les milieux rocheux. [less ▲]

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See detailSécurité des aliments, HACCP et traçabilité.
Anceau, Christine ULg; Sindic, Marianne ULg; Deroanne, Claude

in Troupeaux et Cultures des Tropiques (2005), III(VI), 54-57

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See detailSimulation of complex impact problems with implicit time algorithms: Application to a turbo-engine blade loss problem
Noels, Ludovic ULg; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg

in International Journal of Impact Engineering (2005), 32(1-4), 358386

Recent developments, in non-linear structural dynamics, have led to a new kind of implicit algorithms: the energy-momentum conserving algorithm (EMCA) and the energy-dissipative, momentum-conserving ... [more ▼]

Recent developments, in non-linear structural dynamics, have led to a new kind of implicit algorithms: the energy-momentum conserving algorithm (EMCA) and the energy-dissipative, momentum-conserving algorithm. Contrarily to commonly used algorithms, such as the explicit central difference or the alpha-generalized method, the stability of those algorithms is always ensured in the non-linear range. Thanks to this unconditional stability the only requirement on the time step size is that it must be small enough to capture the physics. This requirement is less restrictive than a conditional stability. In previous works, we have developed a new formulation of the internal forces for a hypoelastic model, that leads to an EMCA. In this paper, we will extend this formulation to an energy-dissipative, momentum-conserving algorithm. We will prove with an academic example, that our algorithm is more accurate than the alpha-generalized method in the non-linear range. Then we will simulate a blade loss problem to demonstrate the efficiency of our developments on complex dynamics simulations. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailValLait - Perspective d’évolution du contrôle laitier en Wallonie (Belgique)
Abras, Sven; Gillon, Alain ULg; Bertozzi, Carlo et al

in 12ièmes Recontres Recherches Ruminants, Paris, les 7 et 8 Décembre 2005 (2005, December)

ValLait est un projet qui vise à optimaliser les valorisations des données récoltées via le contrôle laitier. Ces valorisations reposent sur une régression multiple (“BP”, pour “Best Prediction”) qui ... [more ▼]

ValLait est un projet qui vise à optimaliser les valorisations des données récoltées via le contrôle laitier. Ces valorisations reposent sur une régression multiple (“BP”, pour “Best Prediction”) qui permet d’estimer les productions journalières de lait, de matières grasses et de protéines d’un animal en se basant sur différents effets comme le stade de lactation, la date de vêlage, les historiques de production du troupeau et de la population... En outre, le modèle BP permet également, dès le début de la lactation d’un animal, de prédire ses productions journalières futures. [less ▲]

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See detailPotential benefits of laparoscopic aorto-bifemoral bypass surgery
Rouers, Anthony; MEURISSE, Nicolas; LAVIGNE, Jean-Paul ULg et al

in Acta Chirurgica Belgica (2005), 105(6), 610-615

Background: This series aims to prove the positive impact of laparoscopic approach in aortofemoral bypass grafting. Methods : It concerns a retrospective non randomized study comparing 58 consecutive ... [more ▼]

Background: This series aims to prove the positive impact of laparoscopic approach in aortofemoral bypass grafting. Methods : It concerns a retrospective non randomized study comparing 58 consecutive patients treated with laparoscopic procedure (n = 30) and with a standard open procedure (n = 28) in a single center. The different operating times, the complications and the follow-up of these two groups are compared Results : The demographics and angiographic data of the two groups were comparable. Operating time was longer in the laparoscopic group. However, we noticed a significant shorter hospitalisation stay (p < 0.0001) after the laparoscopic procedure with a mean 5.1 days. There was no significant difference of morbidity. Conclusion : We suggest that the trans-peritoneal approach is the best way in laparoscopic procedure in term of exposure and ergonomics. Laparoscopic aortofemoral bypass grafting is feasible, safe and effective. Shortening of operating time is observed as surgeon's experience grows. [less ▲]

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See detailApproches féministes du cinéma
Van Cauwenberge, Geneviève ULg

Conference given outside the academic context (2005)

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See detailAnalysis of antibody response in goats to caprine herpesvirus 1
Tempesta, M.; Greco, G.; Tarsitano, E. et al

in Biologicals (2005), 33(4), 283-287

Serum samples of goats experiencing natural and experimental infections and/or reactivation of caprine herpesvirus 1 (CpHV.1) were analysed with neutralization and Western blotting (WB) tests. WB ... [more ▼]

Serum samples of goats experiencing natural and experimental infections and/or reactivation of caprine herpesvirus 1 (CpHV.1) were analysed with neutralization and Western blotting (WB) tests. WB immunological patterns resulted differently and related to neutralizing titers. In serum samples having neutralizing titer 1:2-1:4, antibodies to two proteins of Mw of 150 and 34 kDa were present. Antibodies against several proteins, two of those being characterized by monoclonal antibodies as gB and gC, were visualized by WB in sera having titer >= 1:8. The neutralizing antibody titers and the pattern of antibody reactivity were hypothesized to modulate the reactivation and re-excretion process of CpHV.1. (c) 2005 The International Association for Biologicals. Published by Elsevier Ltd. All rights reserved. [less ▲]

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See detailFeeding ecology of five commercial shark species of the Celtic Sea through stable isotope and trace metal analysis
Domi, Nadège; Bouquegneau, Jean-Marie ULg; Das, Krishna ULg

in Marine Environmental Research (2005), 60(5),

In order to trace their feeding habits, stable carbon and nitrogen isotope ratios (delta(15)N and delta(13)C), as well as trace metal concentrations (Zn, Cd, Fe, Cu, Se and Hg) were analysed in the ... [more ▼]

In order to trace their feeding habits, stable carbon and nitrogen isotope ratios (delta(15)N and delta(13)C), as well as trace metal concentrations (Zn, Cd, Fe, Cu, Se and Hg) were analysed in the tissues of five commercial shark species from the Celtic Sea: the tope shark Galeorhinus galeus, the black-mouthed catshark Galeus melastomus, the starry smooth hound Mustelus asterias, the spiny dogfish Squalus acanthias and the lesser-spotted dogfish Scyliorhinus canicula. Our results were compared to previously described stomach contents and isotopic composition of potential preys. Isotopic ratio delta(15)N suggested that tope sharks fed at a higher trophic level (16.7 parts per thousand in the muscle) than the other species, reflecting its piscivorous diet. The lower values of spiny dogfish (11.6 parts per thousand in the muscle) might be explained, amongst other things, by either its migratory behaviour or its preference for preys from lower trophic levels. Cd and Hg were correlated with isotopic ratios delta(13)C and delta(15)N, and were shown to be diet-related whereas Zn, Fe and Cu seemed much more linked to species-specific metabolism. Although this multidisciplinary approach is revealed as a useful tool for the study of shark ecology, the lack of known trophic fractionation suggests that isotopic data be compared to traditional diet analyses. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailEt la pollution marine?
Faucher, Karine ULg; Lepage, Caroline

Article for general public (2005)

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See detailDétermination des zones de prévention du site de captage d'Onoz
Henrion, Vincent; Dassargues, Alain ULg

Report (2005)

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See detailReversing the Brazil nut effect
Ludewig, François ULg; Vandewalle, Nicolas ULg

in European Physical Journal E -- Soft Matter (2005), 18(4), 367-372

We propose a lattice model for studying the Brazil Nut Effect (BNE), i.e. the phase segregation occuring when a granular material is vertically shaked. The model considers the tap intensity and the ... [more ▼]

We propose a lattice model for studying the Brazil Nut Effect (BNE), i.e. the phase segregation occuring when a granular material is vertically shaked. The model considers the tap intensity and the mobility mu of the grains as the main physical parameters. Different mobilities for different grain species lead to segregation (BNE) patterns, reverse segregation (RBNE) patterns, "sandwhich" layered structures or vertical domains. A phase diagram (decompaction chi, mobility difference between both species Delta mu) is obtained in which the different phases are emphasized. In a narrow region of the diagram, different phases coexist. It is shown that the BNE segregation could be reversed by increasing the tap intensity or the characteristics of the grains. Numerical results are compared with earlier experimental works. [less ▲]

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See detailChemical profiles in lake sediments in Laguna Chica de San Pedro (Bio-Bio Region, Chile)
Chirinos, L. R.; Urrutia, R.; Fagel, Nathalie ULg et al

in Journal of the Chilean Chemical Society [=JCCS] (2005), 50(4), 697-710

Metal profiles in lake sediments could provide historical environmental information on impacts caused by human activities and natural events, with view to the formulation of effective environmental ... [more ▼]

Metal profiles in lake sediments could provide historical environmental information on impacts caused by human activities and natural events, with view to the formulation of effective environmental policies. This paper presents data on sedimentary element profiles in Laguna Chica de San Pedro (LCSP) lake, located in the Bio Bio Region in Southern Chile, where important industrial activities are concentrated. Sediment properties (organic and inorganic matter, grain size, particle distribution, biogenic silica, Mn/ Fe ratio), major (Al, Ca, K, Mg, Ti, Na), trace (V, As, Co, Cu, Zn, Ni, Cr, Pb, Sr), and mobile (Fe, Mn, P, S) elements, as well as mineral profiles (plagioclase, quartz, clays, amorphous material) are presented, up to 65 cm depth. In general, relatively constant concentration profiles are observed in the sedimentary core middle section, for most elements. Most changes in composition are seen at the top (recent industrial period) and bottom (before human intervention) sections. Variable redox conditions, generated by biological activity at the sediment-water interface are likely to account for composition profiles at the sediment-water interface. On the other hand, physical processes seem to be mostly responsible for concentration changes in Pre-industrial sediments. Mineral content profiles, such as plagioclase, clay and quartz, as well as total clay content remain fairly constant in most of the core, showing significant changes at its bottom part. High excess V, As, and S values, especially at the upper sediment, arise as a consequence of redox conditions in the lake. Certainly, such metal enrichment is mainly associated with natural sedimentary matter supply from the watershed. [less ▲]

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