Publications ORBi OA
Bookmark and Share    
Full Text
Peer Reviewed
See detailCharacteristics of peri-urban dairy herds of Bobo-Dioulasso (Burkina Faso)
Sidibe, M.; Boly, Hamidou ULg; Lakouetene, T. et al

in Tropical Animal Health and Production (2004), 36(1), 95-100

Peri-urban dairy cattle farms within 50 km of Bobo-Dioulasso were studied to assess herd type, disease incidence, management, feeding and breeding strategy. Out of 417 cattle farmers, 42% had dairy ... [more ▼]

Peri-urban dairy cattle farms within 50 km of Bobo-Dioulasso were studied to assess herd type, disease incidence, management, feeding and breeding strategy. Out of 417 cattle farmers, 42% had dairy objectives and were studied. Among these peri-urban dairy farmers, 60% were settled, 36% semi-settled, and 4% transhumant. In total, they held 4558 dairy cows, of which 32% lactated during the study. The prevalence of mastitis (55%) increased (p<0.05) with herd size. Advanced strategies for supplementary feeding and breeding were most frequent in small herds (< 30 cattle). None of the large herds ( > 60 cattle) had advanced breeding strategies. Bulls and cows were culled at younger ages in herds with better breeding strategy. Overall, this resulted in higher individual milk offtake in small herds (2.46 L/day) compared with large herds (1.25 L/day). Pure breeds were rarely used, and the presence of Bos taurus baoule naturally selected for trypanotolerance was low. The prevalence of trypanosomosis (40%) in herds dominated by Bos indicus zebu and Mere (Zebu x Baoule) is an argument for maintenance of biodiversity and selection of Baoule for milk production. [less ▲]

Detailed reference viewed: 58 (15 ULg)
Full Text
Peer Reviewed
See detailb - tau Yukawa nonunification in supersymmetric SU(5) with an Abelian flavor symmetry
Aristizabal Sierra, Diego ULg; Nardi, Enrico

in Physics Letters B (2004), 578

We present a supersymmetric SU(5) x U(1)H model, free from gauge anomalies, where the Abelian factor U(1)H, introduced to account for the hierarchy of fermion masses and mixings, is broken by the same ... [more ▼]

We present a supersymmetric SU(5) x U(1)H model, free from gauge anomalies, where the Abelian factor U(1)H, introduced to account for the hierarchy of fermion masses and mixings, is broken by the same adjoint representations of SU(5) that also break the GUT symmetry. The model predicts approximate, but never exact, bottom-τ Yukawa unification. The deviations are related to group theoretical coefficients and can naturally be at the level of 10%-20%. [less ▲]

Detailed reference viewed: 9 (0 ULg)
Full Text
See detailLes troubles phonologiques : cadre théorique, diagnostic et traitement
Schelstraete, Marie -Anne; Maillart, Christelle ULg

in Schelstraete, Marie-Anne; Noel, Marie-Pascale (Eds.) Les troubles du langage et du calcul chez l’enfant. (2004)

Detailed reference viewed: 304 (19 ULg)
Full Text
See detailL’évaluation des troubles phonologiques : illustration de la démarche linguistique par la présentation d’épreuves qualitatives.
Maillart, Christelle ULg; Schelstraete, Marie-Anne

in Schelstraete, Marie-Anne; Noël, Marie-Pascale (Eds.) Les troubles du langage et du calcul chez l’enfant. (2004)

Detailed reference viewed: 319 (10 ULg)
Full Text
See detailL'insertion internationale des petits pays. Le cas de l'Uruguay: de l'indépendance au nouveau régionalisme
Santander, Sébastian ULg; Bizzozero, Lincoln

in Santander, Sébastian (Ed.) Globalisation, gouvernance et logiques régionales dans les Amériques (2004)

L'article se penche sur les pays à faible poids économique et politique sur l'arène internationale. Il analyse la stratégie d'intégration régionale sud-américaine de l'Uruguay qui est entouré par deux ... [more ▼]

L'article se penche sur les pays à faible poids économique et politique sur l'arène internationale. Il analyse la stratégie d'intégration régionale sud-américaine de l'Uruguay qui est entouré par deux pays puissants que sont l'Argentine et le Brésil. [less ▲]

Detailed reference viewed: 56 (26 ULg)
Full Text
Peer Reviewed
See detailMarket dynamics driven by the decision-making power producers
Ernst, Damien ULg; Minoia, Anna; Marija, Ilic

in Proceedings of 2004 IREP Symposium - Bulk Power System Dynamics and Control - VI (2004)

In this paper we consider a tool for analyzing the market outcomes when competitive agents (power producers) interact through the market place. The market clearing mechanism is based on the locational ... [more ▼]

In this paper we consider a tool for analyzing the market outcomes when competitive agents (power producers) interact through the market place. The market clearing mechanism is based on the locational marginal price scheme. A model of the strategic behavior is formulated for the agents. Each agent chooses its bid in order to maximize its profit by assuming that the other agents will post the same bid as at the previous session of the market, and by knowing the network characteristics. The income of each agent over a certain temporal horizon for different power system configurations (the addition of new transmission capabilities, new power plants) is evaluated according to this market dynamics and by integrating this dynamics over the chosen temporal horizon. The mathematical formulation, for the sake of simplicity, is related to a two node power system. In the simulations, the influence of different conditions (line transfer capacity, the number and size of generators, the presence of portfolio) on market outcomes is analyzed, and interesting and sometimes counterintuitive results are found. [less ▲]

Detailed reference viewed: 41 (1 ULg)
Full Text
Peer Reviewed
See detailLa place de la recherche scientifique dans le tissu social
Laitat, E.; Marcoen, Jean Marie ULg

in Terre wallonne - Humains admis (2004), 8(2), 67-69

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailApplication of the CALUX bioassay for epidemiological study: analyses of Belgian human plasma
Van Wouwe, Nathalie; Debacker, Noemi; Sasse, André et al

in Organohalogen Compounds (2004)

Detailed reference viewed: 18 (0 ULg)
Full Text
See detailTrajectoires professionnelles féminines : flexibilités et enjeux de genre
Gavray, Claire ULg

in Bulletin Sophia (2004), 37

Detailed reference viewed: 26 (12 ULg)
Full Text
Peer Reviewed
See detailDIOXIN BODY BURDEN AMONG BLOOD DONORS BEFORE AND AFTER THE BELGIAN DIOXIN/PCB INCIDENT
Debacker, Noemi; Sasse, André; Van Wouwe, Nathalie et al

in Organohalogen Compounds (2004)

Detailed reference viewed: 24 (0 ULg)
Full Text
Peer Reviewed
See detailLevels of contamination for various pollutants present in Belgian human plasma
Van Wouwe, Nathalie; Covaci, Adrian; Kannan, Kurunthachalam et al

in Organohalogen Compounds (2004)

Detailed reference viewed: 31 (9 ULg)
Full Text
See detailQuestions d'actualité relatives aux débats succints
Boularbah, Hakim ULg

in Actualités et développements récents en droit judiciaire (2004)

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailPreparation of nanosized barium zirconate powder by precipitation in aqueous solution
Boschini, Frédéric ULg; Guillaume, Bernard ULg; Rulmont, André ULg et al

in Key Engineering Materials [=KEM] (2004), 264-268(Part 1-3), 2335-2338

Several ways were explored to synthesize barium zirconate by soft chemistry methods in aqueous solution. In the first method the synthesis of barium zirconate was initiated by urea decomposition, through ... [more ▼]

Several ways were explored to synthesize barium zirconate by soft chemistry methods in aqueous solution. In the first method the synthesis of barium zirconate was initiated by urea decomposition, through an homogeneous precipitation of barium and zirconium salts 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[1]. A calcination at 1200degreesC during 2 hours gives rise to the formation of a pure barium zirconate phase. In the other methods, barium zirconate was synthesized, in one step without any thermal treatments, by precipitation in highly basic aqueous solutions containing barium and zirconium salts. The effect of the hydroxide concentration was discussed in relation to the barium zirconate phase formation, the particles size and the particles size distribution. For each powder, microstructural characterisations have been performed on sintered bodies in order to evaluate the influence of the thermal treatment on the final density. Dilatometric measurements have been also performed in order to quantify the densification process. Important informations were obtained by these techniques, as for example the existence of an internal porosity which severely limits the final density of the material, even if sintering was performed at high temperature. Thus a careful control of the heating profile seems to be necessary in order to produce dense materials. [less ▲]

Detailed reference viewed: 33 (2 ULg)
Full Text
Peer Reviewed
See detailMyelome multiple et infection a VIH/SIDA : a propos de trois observations.
Elira Dokekias, A.; Moutschen, Michel ULg; Purhuence, M. F. et al

in Revue Médicale de Liège (2004), 59(2), 95-7

HIV infection rages at the endemic state in Sub Saharan African and especially in Congo Brazzaville. We report the observation of three female patients infected with HIV and developing multiple myeloma ... [more ▼]

HIV infection rages at the endemic state in Sub Saharan African and especially in Congo Brazzaville. We report the observation of three female patients infected with HIV and developing multiple myeloma. The three patients were treated at the University hospital of Brazzaville between 2000 and 2002. In two cases multiple myeloma was discovered after the diagnosis of HIV infection. In the other case, the diagnosis of HIV infection was posterior to the occurrence of multiple myeloma. HIV infection was symptomatic in two cases who received consequently antiviral treatment. Multiple myeloma was diagnosed at an advanced stage in the three cases. The paraprotein was an IgG in two cases and an IgA in the other one. The CD4 counts before treatment were around 200/mm3 in two cases and within normal limits in the third case. Viral load was not measured. VMCP and VAMCP regimens were administered without major complications and under anti-infectious prophylaxis. The follow-up is still insufficient to assess the medium-term evolution and to determine the prognosis of multiple myeloma. The description of these three cases confirms the involvement of HIV in B cell lymphoma genesis. [less ▲]

Detailed reference viewed: 62 (1 ULg)
Full Text
See detailThymus and T cells
Geenen, Vincent ULg; Brilot, Fabienne; Hansenne, Isabelle et al

in Smith, Barry H.; Adelman, George (Eds.) Encyclopedia of Neuroscience, 3rd Edition (2004)

Evidence for intimate interconnections between the three major systems of cell communication, the nervous, endocrine and immune systems, has opened important novel research perspectives. Neuroimmune ... [more ▼]

Evidence for intimate interconnections between the three major systems of cell communication, the nervous, endocrine and immune systems, has opened important novel research perspectives. Neuroimmune-endocrine interactions are now established as crucial factors for the control of body development and homeostasis. In distant species and invertebrates, the foundations of both the neuroendocrine system and innate immunity were coexisting until now without any apparent problem. Some 400 millions years ago, in a relatively short period after agnathan fishes (e.g., hagfish and lamprey), adaptive immunity emerged in the first gnathostomes, cartilaginous fishes (e.g., shark and ray). Somatic recombination machinery characterizes adaptive immunity and is responsible for the random generation of the huge diversity of immune receptors able to recognize infectious antigens. The emergence of this novel form of immune defenses exerted a so potent pressure that structures and mechanisms developed along the paths of lymphocyte traffic to impose immunological self-tolerance, that is, the inability of the immune system to attack the host organism. Together with the generation of diversity and memory, self-tolerance constitutes a fundamental property of the immune system. The progressive rise in the level of immune diversity and complexity also explains why self-tolerance failures (i.e., organ-specific autoimmune diseases) were increasingly detected during evolution, the maximum being currently observed in the human species. The first thymus appeared in cartilaginous fishes (chondrichthyes), concomitantly with the emergence of rudimental forms of adaptive immunity. Though some forms of tolerance induction already takes place in primary hemopoietic sites (fetal liver and bone marrow), antigen-dependent B-cell tolerance is primarily due to an absence of T-cell help. Among all lymphoid structures, the thymus is the only organ specialized in the establishment of central self-tolerance. The thymus crucially stands at the crossroad between the immune and neuroendocrine systems. In this organ responsible for thymopoiesis—T-cell generation—(Kong et al., 1998), the neuroendocrine system regulates the process of T-cell differentiation from the very early stages. In addition, T lymphocytes undergo inside the thymus a complex educative process that establishes central T-cell self-tolerance of neuroendocrine principles (Geenen et al., 1992; Martens et al., 1996). Within the thymus, a confrontation permanently occurs between previously established neuroendocrine principles and a recent system equipped with recombination machinery promoting stochastic generation of response diversity. Contrary to a previous assumption, the thymus functions throughout life (Poulin et al., 1999; Geenen et al., 2003) and plays a fundamental role in the recovery of a competent T-cell repertoire after intensive chemotherapy or during highly active antiretroviral therapy (Mackall et al., 1995; Douek et al., 1998). [less ▲]

Detailed reference viewed: 46 (4 ULg)