References of "Article"
     in
Bookmark and Share    
See detailDe l'utilisation pédagogique d'Internet dans l'enseignement secondaire
Hubert, Sylviane; Petit, Christelle; Demily, Fabian et al

in Point sur la Recherche en Education (Le) (2001)

Detailed reference viewed: 112 (7 ULg)
Full Text
Peer Reviewed
See detailTremblement essentiel: diagnostic différentiel et traitement
DELVAUX, Valérie ULg; MAERTENS DE NOORDHOUT, Alain ULg

in Médecine et Hygiène (2001), 59

Detailed reference viewed: 44 (3 ULg)
Peer Reviewed
See detailExperimental M1 Transition Rates in Highly Charged Krypton Ions
Träbert, E.; Beiersdorfer, P.; Brown, G. V. et al

in Physical Review. A (2001), 64

Detailed reference viewed: 14 (2 ULg)
Full Text
See detailJe lis, j'écris : la pratique du journal de lecture
De Croix, Séverine ULg

in Enjeux : Revue de Formation Continuée et de Didactique du Français (2001), 50

Detailed reference viewed: 65 (0 ULg)
Full Text
Peer Reviewed
See detail(R/S)-3-(3-Methyl-2-butylamino)-4H-pyrido[4,3-e]-1,2,4-thiadiazine 1,1-dioxide mono-hydrate
Dupont, L.; De Tullio, Pascal ULg; Tinant, B. et al

in Acta Crystallographica (2001), E57

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailKinetics of light emission and oxygen consumption by bioluminescent bacteria.
Bourgeois, J. J.; Sluse, Francis ULg; Baguet, F. et al

in Journal of Bioenergetics & Biomembranes (2001), 33

Oxygen plays a key role in bacterial bioluminescence. The simultaneous and continuous kinetics of oxygen consumption and light emission during a complete exhaustion of the exogenous oxygen present in a ... [more ▼]

Oxygen plays a key role in bacterial bioluminescence. The simultaneous and continuous kinetics of oxygen consumption and light emission during a complete exhaustion of the exogenous oxygen present in a closed system has been investigated. The kinetics are performed with Vibrio fischeri, V. harveyi, and Photobacterium phosphoreum incubated on respiratory substrates chosen for their different reducing power. The general patterns of the luminescence time courses are different among species but not among substrates. During steady-state conditions, substrates, which are less reduced than glycerol, have, paradoxally, a better luminescence efficiency. Oxygen consumption by luciferase has been evaluated to be approximately 17% of the total respiration. Luciferase is a regulatory enzyme presenting a positive cooperative effect with oxygen and its affinity for this final electron acceptor is about 4-5 times higher than the one of cytochrome oxidase. The apparent Michaelis constant for luciferase has been evaluated to be in the range of 20 to 65 nM O2. When O2 concentrations are as low as 10 nM, luminescence can still be detected; this means that above this concentration, strict anaerobiosis does not exist. By n-butyl malonate titration, it was clearly shown that electrons enter the luciferase pathway only when the cytochrome pathway is saturated. It is suggested that, in bioluminescent bacteria, luciferase acts as a free-energy dissipating valve when anabolic processes (biomass production) are impaired. [less ▲]

Detailed reference viewed: 38 (1 ULg)
Full Text
Peer Reviewed
See detailExpression, purification, crystallization and preliminary X-ray analysis of the native class C beta-lactamase from Enterobacter cloacae 908R and two mutants.
Wouters, J.; Charlier, Paulette ULg; Monnaie, D. et al

in Acta Crystallographica Section D-Biological Crystallography (2001), 57(Pt 1), 162-4

Crystals have been obtained of the Enterobacter cloacae 908R beta-lactamase and two point mutants by the vapour-diffusion method using similar conditions [pH 9.0, polyethylene glycol (M(r) = 6000) as ... [more ▼]

Crystals have been obtained of the Enterobacter cloacae 908R beta-lactamase and two point mutants by the vapour-diffusion method using similar conditions [pH 9.0, polyethylene glycol (M(r) = 6000) as precipitant]. The three crystal forms belong to the orthorhombic space group P2(1)2(1)2, with roughly the same unit-cell parameters; i.e. for the wild-type crystals a = 46.46, b = 82.96, c = 95.31 A. In the best cases, the crystals diffract to about 2.1 A resolution on a rotating-anode X-ray source at room temperature. Co-crystallization experiments of poor substrates with the wild-type protein and the active-site serine mutant (S64C) are planned and should lead to a better understanding of the catalytic mechanism of class C beta-lactamases. [less ▲]

Detailed reference viewed: 24 (0 ULg)
Full Text
Peer Reviewed
See detailComparison of inulin with urea as dilutional markers of bronchoalveolar lavage in healthy and heaves-affected horses.
Kirschvink, Nathalie; Fievez, Laurence ULg; Dogne, S. et al

in Veterinary Research (2001), 32(2), 145-154

Solute analysis in bronchoalveolar lavage fluid involves the use of dilutional markers to correct for variable recovery of pulmonary epithelial lining fluid (PELF). Urea is the best characterised ... [more ▼]

Solute analysis in bronchoalveolar lavage fluid involves the use of dilutional markers to correct for variable recovery of pulmonary epithelial lining fluid (PELF). Urea is the best characterised endogenous marker, whereas inulin appears to meet the requirements of an exogenous marker. In horses, the use of inulin has never been investigated and the impact of lower airway diseases such as heaves, on PELF recovery is unknown. In this study, five healthy and five heaves-affected horses underwent airway endoscopy and bronchoalveolar lavage. PELF recovery from bronchoalveolar lavage was calculated by the inulin and the urea method. The inulin method was compared to the urea method and differences between healthy and heaves-affected horses were analysed. From a technical and analytical point of view, inulin fulfilled the requirements of a marker of dilution as well as urea. When both healthy and heaves-affected horses groups were pooled together, PELF recovery calculated by the inulin method was significantly higher than by the urea method (6.43+/-4.08% versus 0.789+/-0.299%, P < 0.005). No significant differences were observed between healthy and heaves-affected horses, neither by the inulin nor by the urea method. Inulin did not present major advantages over urea, but the combined use of both markers can improve the standardisation of studies comparing PELF compounds, by providing upper limits (inulin dilution) and lower limits (urea dilution) of PELF recovery. [less ▲]

Detailed reference viewed: 73 (13 ULg)
Full Text
Peer Reviewed
See detailIron bacterial and fungal mats, Bajocian stratotype (Mid-Jurassic, northern Normandy, France)
Préat; Mamet, B.; De Ridder, C. et al

in Sedimentary Geology (2001), 137

The Oolithe ferrugineuse de Bayeux Formation is located at the historical Bajocian stratotype of Sainte-Honorine-des-Pertes, north of Bayeux, Normandy. The condensed formation ranges from the base of the ... [more ▼]

The Oolithe ferrugineuse de Bayeux Formation is located at the historical Bajocian stratotype of Sainte-Honorine-des-Pertes, north of Bayeux, Normandy. The condensed formation ranges from the base of the Humphriesianum Zone to the Parkinsoni Zone and is divided into four beds of decimetric scale. Three main microfacies are present: (1) oncoid rudstones, (2) ooid bioclastic packstones and (3) silty burrowed wackestones/ packstones. Sedimentation took place in a very quiet environment, below the photic zone and below or near the storm wave base. The general setting is a distal carbonate ramp, its lower part characterized by hemipelagic sedimentation indicated by the presence of planktonic foraminifers. The inferred depth is around 100 m. Free oxygen concentration was low. Dysaerobic conditions are indicated by a scarcity of benthic macrofauna. Ferruginous structures are numerous in the first two microfacies, and absent in the last. Hematite staining is not uniform and follows many sedimentary patterns. Among the more widespread Fe structures are perforation infillings with endolithic microorganisms, microstromatolites, oncoids, ooids, blisters, coatings and hardgrounds. These structures can be associated and none are mutually exclusive. Hematite-coated filaments of different sizes and shapes are observed in the micrite matrix: the walls of various organisms; the calcite crystals associated with the Fe cortical laminations; the perforations and burrow; the hardgrounds; and microstromatolites. Petrographical and SEM examinations suggest that the laminated crusts (oncoids and hardgrounds) are formed by microbial iron mats dominated by filamentous bacteria and fungi. Seven types of microbes are recognized: filaments (five morphotypes), spheroidal bodies and stalked bodies. Filamentous microfossils of type 1 to 4 resemble the present-day filamentous bacteria (Beggiatoales and Cytophagaceae). Because of their large diameter and their branching nature, filaments of type 5 are possibly filamentous fungi. Another argument in favor of fungi is the presence of stalked and spheroidal bodies that resemble zoosporangia and oogonia of some Oomycota. In deep, calm and dysaerobic waters, many interfaces (e.g. between aerobic and dysaerobic waters) are present in the sediments. The stability of the soluble reduced state of iron (Fe2+) is higher at such interfaces, and many ferric iron-encrusted microbial fossils are observed. Iron could thus serve as an electron donor for microbial iron-oxidation processes. Other microbial iron deposition pathways are also possible. It appears that, regardless of geological age (Paleozoic, Mesozoic) and geographical location, the same microbiological mechanisms are probably responsible for the red color in calcareous stratified or unstratified bodies. The presence of fossilized iron-encrusted bacteria and fungi at interfaces may therefore serve as an indicator of anoxic to dysaerobic conditions in various paleo(micro)environments. [less ▲]

Detailed reference viewed: 54 (2 ULg)
Peer Reviewed
See detailGenetic Diversity In The Lima Bean (Phaseolus Lunatus L.) As Revealed By Chloroplast Dna (Cpdna) Variations
Fofana, B.; Du Jardin, Patrick ULg; Baudoin, Jean-Pierre ULg

in Genetic Resources and Crop Evolution (2001), 48(5),

Detailed reference viewed: 15 (0 ULg)
Peer Reviewed
See detailUmetnost Čarlsa Simića
Delville, Michel ULg

in ProFemina : Časopis za żensku knjiżevnost I kulturu (2001), 27

Detailed reference viewed: 19 (0 ULg)
Full Text
Peer Reviewed
See detailEfficacite d'une technique standardisee de MRCP pour la detection de choledocholithiase: experience d'un an chez des sujets symptomatiques.
Brisbois, D.; Plomteux, O.; NCHIMI LONGANG, Alain ULg et al

in JBR-BTR : organe de la Societe royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR) (2001), 84(6), 258-61

In our institution, MRCP is actually replacing diagnostic ERCP. This study is addressing its accuracy in the diagnosis of symptomatic choledocholithiasis. 137 MRCP were performed in patients with upper ... [more ▼]

In our institution, MRCP is actually replacing diagnostic ERCP. This study is addressing its accuracy in the diagnosis of symptomatic choledocholithiasis. 137 MRCP were performed in patients with upper abdominal pain and biological anomalies (n = 48), pain with cholelithiasis at sonography (n = 69) or non-alcoholic acute pancreatitis (n = 20) on a 1.5 T system with high gradients using a standardized combination of breath-hold HASTE and RARE sequences. We included in our study 74 patients who underwent as second test ERCP (n = 36), peroperative cholangiography (n = 13), or extensive follow-up with laboratory tests and/or sonography (n = 25). All examinations were judged as diagnostic, discrepancies between direct cholangiography and MRCP being noted in 4 patients (5.4%). Lithiasis was misinterpreted on MRCP as bubbles in 2 patients after sphincterotomy or surgery. We had two false positive diagnoses on MRCP: in one patient peroperative cholangiography was negative and in the other one ERCP was negative. With a sensitivity and PPV of 92%, a specificity and NPV of 96% MRCP in our experience is shown as an accurate diagnostic tool for the detection of stone in the common bile duct replacing ERCP. [less ▲]

Detailed reference viewed: 22 (2 ULg)
Full Text
Peer Reviewed
See detailThe Human Vpac(1) Receptor - Three-Dimensional Model And Mutagenesis Of The N-Terminal Domain
Lins, Laurence ULg; Couvineau, A.; Rouyer-Fessard, C. et al

in Journal of Biological Chemistry (2001), 276(13),

The human VPAC(1) receptor for vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase activating peptide belongs to the class II family of G-protein-coupled receptors with seven transmembrane ... [more ▼]

The human VPAC(1) receptor for vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase activating peptide belongs to the class II family of G-protein-coupled receptors with seven transmembrane segments. Like for all class II receptors, the extracellular N-terminal domain of the human VPAC(1) receptor plays a predominant role in peptide ligand recognition. To determine the three-dimensional structure of this N-terminal domain (residues 1-144), the Protein Data Bank (PDB) was screened for a homologous protein. A subdomain of yeast lipase B was found to have 27% sequence identity and 50% sequence homology with the N-terminal domain (8) of the VPAC(1) receptor together with a good alignment of the hydrophobic clusters. A model of the N-terminal domain of VPAC(1) receptor was thus constructed by homology. It indicated the presence of a putative signal sequence in the N-terminal extremity. Moreover, residues (Glu(36), Trp(67), Asp(68), Trp(73), and Gly(109)) which were shown to be crucial for VIP binding are gathered around a groove that is essentially negatively charged. New putatively important residues for VIP binding were suggested from the model analysis. Site-directed mutagenesis and stable transfection of mutants in CHO cells indicated that Pro(74), Pro(87), Phe(90), and Trp(110) are indeed important for VIP binding and activation of adenylyl cyclase activation. Combination of molecular modeling and directed mutagenesis provided the first partial three-dimensional structure of a VIP-binding domain, constituted of an electronegative groove with an outspanning tryptophan shell at one end, in the N-terminal extracellular region of the human VPAC(1) receptor. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailQuelques spécimens exceptionnels de premières plantes terrestres découvertes au Brésil (Bassin du Paraná, Dévonien basal)
Gerrienne, Philippe ULg; Milagres, I.; Bergamaschi, S. et al

in Geo-Eco-Trop (2001), 25

Detailed reference viewed: 35 (11 ULg)
Full Text
Peer Reviewed
See detailDiblock polyampholytes at the silicon/water interface: adsorption at various modified silicon substrates
Mahltig, Boris; Jérôme, Robert ULg; Stamm, Manfred

in Physical Chemistry Chemical Physics [=PCCP] (2001), 3(19), 4371-4375

The adsorption behaviour of the ampholytic diblock copolymer poly(methacrylic acid)-block-poly((dimethylamino)ethyl methacrylate), PMAA-b-PDMAEMA, was investigated on differently prepared silicon surfaces ... [more ▼]

The adsorption behaviour of the ampholytic diblock copolymer poly(methacrylic acid)-block-poly((dimethylamino)ethyl methacrylate), PMAA-b-PDMAEMA, was investigated on differently prepared silicon surfaces. All adsorption experiments were performed from aqueous solutions as a function of pH. The polyampholyte amount adsorbed was determined ellipsometrically, while the topographies of the adsorbed polymer were investigated using scanning force microscopy (SFM). Three polyampholyte systems with similar molecular weight around 60000 g mol–1 and different block ratios were adsorbed on three different types of silicon substrates. Depending on the pretreatment the silicon substrates contained different isoelectric points (IEP) and hydrophobicity. The adsorbed amount, as a function of pH, was characterized by maxima and minima near the IEP of the polyampholytes. In the case of polyampholytes containing an IEP close to the IEP of the silicon substrates, the nature of the substrate strongly influenced the adsorption behaviour. Even a complete erasure of one adsorption maximum could be observed in some cases. In contrast to this, polyampholytes with an IEP in a pH area far away from the IEP of the substrates adsorbed in a quite similar manner on the different substrates. [less ▲]

Detailed reference viewed: 12 (2 ULg)
Full Text
Peer Reviewed
See detailIleo-caecal actinomycosis: Report of a case simulating complicated inflammatory bowel disease
Postal, Alain; Detry, Olivier ULg; Louis, Edouard ULg et al

in Acta Gastro-Enterologica Belgica (2001), 64(4, Oct-Dec), 318-320

Abdominal actinomycosis is a rare infectious disease caused by Actinomyces israelii, a gram-positive anaerobic saprophyte germ that is a normal inhabitant of the upper intestinal tract in humans ... [more ▼]

Abdominal actinomycosis is a rare infectious disease caused by Actinomyces israelii, a gram-positive anaerobic saprophyte germ that is a normal inhabitant of the upper intestinal tract in humans. Actinomyces israelii rarely cause abdominal infections or actinomycosis. Abdominal actinomysosis is characterised by fistulae and abscesses and may mimic cancer or inflammatory bowel disease. Abdominal actinomycosis is difficult to diagnose preoperatively, and often require surgical removal of the diseased tissue, allowing pathologists for giving the definitive diagnosis, revealed by characteristic "sulfur granules". The authors report herein the case of a 47-year-old man who presented with diarrhoea and abdominal pain. Abdominal computed tomography evoked complicated inflammatory bowel disease and surgical procedure was decided. Laparoscopic exploration did not provide further significant information, and laparotomy with diseased bowel resection was performed. Pathology demonstrated "sulfur granules" and allowed the diagnosis of abdominal actinomycosis. This case demonstrated that abdominal actinomycosis should be included in the differential diagnosis when computed tomography shows an infiltrative and inflammatory mass. [less ▲]

Detailed reference viewed: 152 (3 ULg)
Full Text
Peer Reviewed
See detailPancreas development in zebrafish: early dispersed appearance of endocrine hormone expressing cells and their convergence to form the definitive islet.
Biemar, F.; Argenton, F.; Schmidtke, R. et al

in Developmental Biology (2001), 230(2), 189-203

To begin to understand pancreas development and the control of endocrine lineage formation in zebrafish, we have examined the expression pattern of several genes shown to act in vertebrate pancreatic ... [more ▼]

To begin to understand pancreas development and the control of endocrine lineage formation in zebrafish, we have examined the expression pattern of several genes shown to act in vertebrate pancreatic development: pdx-1, insulin (W. M. Milewski et al., 1998, Endocrinology 139, 1440-1449), glucagon, somatostatin (F. Argenton et al., 1999, Mech. Dev. 87, 217-221), islet-1 (Korzh et al., 1993, Development 118, 417-425), nkx2.2 (Barth and Wilson, 1995, Development 121, 1755-1768), and pax6.2 (Nornes et al., 1998, Mech. Dev. 77, 185-196). To determine the spatial relationship between the exocrine and the endocrine compartments, we have cloned the zebrafish trypsin gene, a digestive enzyme expressed in differentiated pancreatic exocrine cells. We found expression of all these genes in the developing pancreas throughout organogenesis. Endocrine cells first appear in a scattered fashion in two bilateral rows close to the midline during mid-somitogenesis and converge during late-somitogenesis to form a single islet dorsal to the nascent duodenum. We have examined development of the endocrine lineage in a number of previously described zebrafish mutations. Deletion of chordamesoderm in floating head (Xnot homolog) mutants reduces islet formation to small remnants, but does not delete the pancreas, indicating that notochord is involved in proper pancreas development, but not required for differentiation of pancreatic cell fates. In the absence of knypek gene function, which is involved in convergence movements, the bilateral endocrine primordia do not merge. Presence of trunk paraxial mesoderm also appears to be instrumental for convergence since the bilateral endocrine primordia do not merge in spadetail mutants. We discuss our findings on zebrafish pancreatogenesis in the light of evolution of the pancreas in chordates. [less ▲]

Detailed reference viewed: 43 (0 ULg)
Full Text
Peer Reviewed
See detailCentral self-tolerance by thymic presentation of self-antigens and autoimmunity
Geenen, Vincent ULg; Martens, Henri ULg; Hansenne, Isabelle et al

in Current Medicinal Chemistry - Immunology, Endocrine & Metabolic Agents (2001), 1

Before reacting against non-self infectious agents, the immune system is educated to tolerate the host molecular structure (self). The induction of self-tolerance is a multistep process that begins in the ... [more ▼]

Before reacting against non-self infectious agents, the immune system is educated to tolerate the host molecular structure (self). The induction of self-tolerance is a multistep process that begins in the thymus during fetal ontogeny (central tolerance) and also involves inactivating mechanisms outside the thymus (peripheral tolerance). The thymus is the primary lymphoid organ implicated in the development of competent and self-tolerant T cells. During ontogeny, T cell progenitors originating from hemopoietic tissues (yolk sac, fetal liver, and then bone marrow) enter the thymus and undergo a program of proliferation, T cell receptor (TCR) gene rearrangement, maturation and selection. Close interactions between thymocytes (pre-T cells) and the thymic cellular environment are crucial both for T cell development and induction of central self-tolerance. Thymic epithelial and stromal cells synthesize polypeptides belonging to various neuroendocrine families. The thymic repertoire of neuroendocrine-related precursors transposes at the molecular level the dual role of the thymus in T cell negative and positive selection. Thymic precursors not only constitute a source of growth peptides for cryptocrine signaling between thymic stromal cells and pre-T cells, but are also processed in a way that leads to the presentation of self-antigens by thymic major histocompatibility complex (MHC) proteins. Thymic neuroendocrine self-antigens often correspond to peptide sequences highly conserved during the evolution of their corresponding family. The thymic presentation of some neuroendocrine self-antigens is not restricted by MHC alleles. Following the presentation of neuroendocrine self-antigens by thymic MHC proteins, the T cell system might be educated to tolerate main hormone families. Recent experiments argue that a defect in the thymic essential tolerogenic function is implicated as an important factor in the pathophysiology of many autoimmune diseases. [less ▲]

Detailed reference viewed: 33 (3 ULg)
Full Text
Peer Reviewed
See detailCardiac surgery in octogenarians: who, when and how?
Pierard, Luc ULg

in European heart journal (2001), 22(14), 1159-61

Detailed reference viewed: 18 (0 ULg)
See detailComment j'explore ... la musculature paravertebrale lombaire dans les radiculopathies par electromyographie.
Tomasella, Marco ULg; Crielaard, Jean-Michel ULg; WANG, François-Charles ULg

in Revue Médicale de Liège (2001), 56(10), 716-22

Lumbar paraspinal muscles examination is an interesting part of the electrodiagnostic evaluation of patients with suspected lumbosacral radiculopathy. However, many electromyographers hesitate to ... [more ▼]

Lumbar paraspinal muscles examination is an interesting part of the electrodiagnostic evaluation of patients with suspected lumbosacral radiculopathy. However, many electromyographers hesitate to routinely include that technique in their study of lower limbs. The purpose of this paper is to specify the anatomy and electrophysiologic data of multifidus lumbar paraspinal muscle. Previous anatomic studies indicate that the medial lumbar multifidus and lumbar interspinalis muscles share unisegmental innervation by the dorsal ram of the spinal nerve. Electromyography of these muscles can improve the sensitivity of lumbosacral radiculopathy detection. Multi-MUP analysis of quantitative electromyographic parameters in lumbar paraspinal muscles, in a population of 75 healthy subjects without back pain, allowed to set up normal values for the L5 myotome. [less ▲]

Detailed reference viewed: 65 (9 ULg)
Peer Reviewed
See detailEffects of liming on forest soil algal communities
Kostinov, I.; Carnol, Monique ULg; Dulière, J.-F. et al

in Algological Studies (2001), 102

The effects of the application of dolomite lime (5 t ha-1) on soil algal communities were investigated in sessile oak (Quercus petraea (MATT.) LIEB.) and Norway spruce (Picea abies (L.) KARST.) plots ... [more ▼]

The effects of the application of dolomite lime (5 t ha-1) on soil algal communities were investigated in sessile oak (Quercus petraea (MATT.) LIEB.) and Norway spruce (Picea abies (L.) KARST.) plots situated in the Belgian Ardenne. Chlorophyta (60 taxa) were by far the most diverse group, followed by Xanthophyceae (10 taxa), Bacillariophyceae (3 taxa), Cyanophyceae (2 taxa) and Euglenophyceae (1 taxon). In both forest types, liming lead to a significant increase in soil pH, exchangeable magnesium and calcium. In the limed Quercus plots available phosphorus and soil solution nitrate concentrations were also increased. The soil algal diversity was similar in oak and spruce control plots and in limed spruce plots. However, in the limed oak plots a significantly higher algal diversity was observed. On the basis of a CCA analysis, three clusters of plots could be distinguished: a) Picea control plots, b) limed Picea and control Quercus plots, c) limed Quercus plots. Both soil pH and nutrient availability seem to be important in determining algal species composition in these forest soils. [less ▲]

Detailed reference viewed: 56 (1 ULg)
Full Text
Peer Reviewed
See detailLe contrôle de la constitutionnalité des lois aux Pays-Bas
Kohl, Benoît ULg

in Chroniques de Droit Public = Publiekrechtelijke Kronieken (2001)

Detailed reference viewed: 48 (2 ULg)
Full Text
Peer Reviewed
See detailEffects of allelochemicals from first (Brassicaceae) and second (Myzus persicae and Brevicoryne brassicae) trophic levels on Adalia bipunctata
Francis, Frédéric ULg; Lognay, Georges ULg; Wathelet, Jean-Paul ULg et al

in Journal of Chemical Ecology (2001), 27(2), 243-256

Three Brassicaceae species, Brassica napus (low glucosinolate content), Brassica nigra (including sinigrin), and Sinapis alba (including sinalbin) were used as host plants for two aphid species: the ... [more ▼]

Three Brassicaceae species, Brassica napus (low glucosinolate content), Brassica nigra (including sinigrin), and Sinapis alba (including sinalbin) were used as host plants for two aphid species: the generalist Myzus persicae and the specialist Brevicoryne brassicae. Each combination of aphid species and prey host plant was used to Feed the polyphagous ladybird beetle, Adalia bipunctata. Experiments with Brassicaceae species including different amounts and kinds of glucosinolates (GLS) showed increased ladybird larval mortality at higher GLS concentrations. When reared on plants with higher GLS concentrations, the specialist aphid, B. brassicae, was found to be more toxic than M. persicae. Identification of GLS and related degradation products, mainly isothiocyanates (ITC), was investigated in the first two trophic levels, plant and aphid species, by high-performance liquid chromatography and gas chromatography-mass spectrometry, respectively. While only GLS were detected in M. persicae on each Brassicaceae species, high amounts of ITC were identified in B. brassicae samples (allyl-ITC and benzyl-ITC from B. nigra and S. alba, respectively) from all host plants. Biological effects of allelochemicals from plants on predators through aphid prey are discussed in relation to aphid species to emphasize the role of the crop plant in integrated pest management in terms of biological control efficacy. [less ▲]

Detailed reference viewed: 43 (7 ULg)
Peer Reviewed
See detailImpact des tiques sur la croissance des agneaux Djallonké
Hounzangbe, M. S.; Koutinhouin, G. B.; Linton, E. et al

in Annales de Médecine Vétérinaire (2001), 145

Detailed reference viewed: 35 (2 ULg)
Full Text
Peer Reviewed
See detailPalladium-silver sol-gel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene III. Kinetics and reaction mechanism
Heinrichs, Benoît ULg; Schoebrechts, Jean-Paul; Pirard, Jean-Paul ULg

in Journal of Catalysis (2001), 200(2), 309-320

The kinetics of selective hydrodechlorination of 1,2-dichloro-ethane into ethylene over a Pd-Ag/SiO2 catalyst is studied. Kinetic data at 573, 596, and 647 K have been obtained by means of experimental ... [more ▼]

The kinetics of selective hydrodechlorination of 1,2-dichloro-ethane into ethylene over a Pd-Ag/SiO2 catalyst is studied. Kinetic data at 573, 596, and 647 K have been obtained by means of experimental designs in the space of the partial pressures of the four components influencing kinetics, that is, 1,2-dichloroethane, hydrogen, ethylene, and hydrogen chloride. One model among the numerous ones examined allows us to represent correctly the experimental data. Ii: corresponds to the following mechanism: dechlorination of 1,2-dichloroethane into ethylene occurs on silver through dissociative adsorption with successive breaking of the two C-Cl bonds and desorption of C2H4. Thanks to its activation power of hydrogen by dissociative chemisorption, palladium present at the surface of the alloy supplies hydrogen atoms for regeneration of the chlorinated silver surface into metallic silver. The presence of hydrogen adsorbed on Pd also causes the undesired ethylene hydrogenation leading to a loss of olefin selectivity. (C) 2001 Academic Press. [less ▲]

Detailed reference viewed: 66 (16 ULg)
Full Text
Peer Reviewed
See detailOn the origin and systematics of the northern African wood mouse (Apodemus sylvaticus) populations: a comparative study of mtDNA restriction patterns
Libois, Roland ULg; Michaux, Johan ULg; Ramalhinho, M. G. et al

in Canadian Journal of Zoology (2001), 79(8), 1503-1511

Conflicting hypotheses have been formulated regarding the origin of wood mouse (Apodemus sylvaticus) populations in northern Africa. In this study, the mtDNA restriction patterns of mice (n = 28 ... [more ▼]

Conflicting hypotheses have been formulated regarding the origin of wood mouse (Apodemus sylvaticus) populations in northern Africa. In this study, the mtDNA restriction patterns of mice (n = 28) collected in Tunisia and Morocco are compared with those of representatives from southern Europe (n = 102). The neighbour-joining tree confirms the existence of the three lineages previously found in the Mediterranean area: western, Tyrrhenian-Balkan, and Sicilian. The western group is isolated from the two others, with bootstrap values of 89 and 95%. Northern African patterns are included in the western group. Their variability is low, the same pattern being shared by five Tunisian and all Moroccan animals (n = 18), caught either in the north of the country (Cap Spartel) or in the south (Marrakech). This implies that northern African wood mouse populations have a southwestern European origin and that their presence in the region is probably recent, which corresponds to both paleontological data and the hypothesis of anthropogenic introduction. [less ▲]

Detailed reference viewed: 56 (1 ULg)
Full Text
Peer Reviewed
See detailNews on antifungal drugs registered in Belgium for the treatment of dermatophytosis in domestic carnivores.
Hamoir, J.; Goret, M.; Mignon, Bernard ULg et al

in Annales de Médecine Vétérinaire (2001), 145

This note gives a progress report on the various molecules registered in Belgium which can be used for the treatment of dermatophytosis in domestic carnivores. Its purpose is not to develop the ... [more ▼]

This note gives a progress report on the various molecules registered in Belgium which can be used for the treatment of dermatophytosis in domestic carnivores. Its purpose is not to develop the therapeutic protocols used in this type of diseases but rather to describe these compounds according to their pharmacological and toxicological characteristics as well as to define their status in the current legal framework. [less ▲]

Detailed reference viewed: 48 (2 ULg)
Peer Reviewed
See detailCoordinated regulation of procollagens I and III and their post-translational enzymes by dissipation of mechanical tension in human dermal fibroblasts.
Lambert, Charles ULg; Colige, Alain ULg; Lapiere, C. M. et al

in European Journal of Cell Biology (2001), 80(7), 479-85

Mechanical tension governs fibroblast proliferation and survival and the homeostasis of the extracellular matrix to adapt its resistance to the mechanical requirements of the organs. To consolidate this ... [more ▼]

Mechanical tension governs fibroblast proliferation and survival and the homeostasis of the extracellular matrix to adapt its resistance to the mechanical requirements of the organs. To consolidate this view, we analysed the effect of tension release on the expression of molecules involved in the architecture and stabilisation of the collagen fibres, namely the procollagens type I and III, the amino- and carboxy-procollagen peptidases (N-pCP and C-pCP) and lysyl oxidase. Cells were cultured in conditions of high mechanical stress in monolayer on a collagen coat and under reduced tension by disruption of the cytoskeleton upon treatment with cytochalasin D in monolayer on a collagen coat or by integrin-mediated stress relaxation in a freely retracting collagen gel. The mRNAs were measured by quantitative RT-PCR monitored by simultaneous reverse-transcription and amplification of an original internal standard. Tension relaxation resulted in a decreased expression of the procollagens type I and III, of the two expressed forms of C-pCP, of the two forms of N-pCP and of lysyl oxidase. Type III collagen, known to control diameter of the fibres, was less down-regulated than type I collagen. Interestingly, the expression of the two alternatively spliced forms of the N-pCP was dissimilarly regulated. These data suggest that mechanical tension may modulate the stiffness of the extracellular matrix by controlling not only the level of expression of its fibrillar constituents but also that of the enzymes participating in their extracellular processing and mechanical stabilisation. [less ▲]

Detailed reference viewed: 21 (8 ULg)
Peer Reviewed
See detailCell turnover in BLV-infected sheep.
Debacq, C.; Peremans, T.; Kerkhofs, P. et al

in AIDS Research and Human Retroviruses (2001), 17(1), 13

Detailed reference viewed: 11 (1 ULg)
Full Text
Peer Reviewed
See detailTOWNSCOPE II - A computer system to support solar access decision-making
Teller, Jacques ULg; Azar, Sleiman ULg

in International Journal of Solar Energy (2001), 70/3

TOWNSCOPE II is a computer system devoted to support solar access decision-making in a sustainable urban design perspective. The software consists of a three-dimensional urban information system coupled ... [more ▼]

TOWNSCOPE II is a computer system devoted to support solar access decision-making in a sustainable urban design perspective. The software consists of a three-dimensional urban information system coupled with solar evaluation tools. We’ve paid particular attention to the fact that numerical results interpretation proves to be all but trivial in complex built environments. It is nevertheless a crucial aspect in decision-making, especially for current negotiated urban design practices. Which is why developing visual instruments in order to unveil the geometrical mechanisms lying behind the final results. Various spherical projections were thereby developed, each of them presenting specific advantages and disadvantages for solar access visualisation and/or evaluation purposes. [less ▲]

Detailed reference viewed: 280 (25 ULg)
Peer Reviewed
See detailFine-mapping and construction of a bovine contig spanning the ovine callipyge locus.
Shay, T. L.; Berghmans, S.; SEGERS, Karin ULg et al

in Mammalian Genome : Official Journal of the International Mammalian Genome Society (2001), 12(2), 141-9

The callipyge (CLPG) gene was fine-mapped by linkage analysis to a 4.6-cM chromosome interval on distal ovine OAR18q, flanked by microsatellite markers IDVGA30 and OY3. The OAR18q linkage map and human ... [more ▼]

The callipyge (CLPG) gene was fine-mapped by linkage analysis to a 4.6-cM chromosome interval on distal ovine OAR18q, flanked by microsatellite markers IDVGA30 and OY3. The OAR18q linkage map and human HSA14q transcript map were aligned by genotyping two bovine-hamster whole-genome radiation hybrid panels with the microsatellite markers, as well as with sequences corresponding to HSA 14q genes. Using Type I loci mapping to the IDVGA30-OY3 interval as anchor points, we have constructed a 1.4-Mb bovine BAC contig containing the IDVGA30-OY3 interval. We demonstrate that the IDVGA30-OY3 interval spans approximately 770 kb and contains at least four genes: YY1, WARS, DLK1, and GTL2. [less ▲]

Detailed reference viewed: 5 (2 ULg)
Full Text
Peer Reviewed
See detailOrientation And Effects Of Mastoparan X On Phospholipid Bicelles
Whiles, Ja.; Brasseur, Robert ULg; Glover, Kj. et al

in Biophysical Journal (2001), 80(1), 280-93

Mastoparan X (MPX: INWKGIAAMAKKLL-NH2) belongs to a family of ionophoric peptides found in wasp venom. Upon binding to the membrane, MPX increases the cell's permeability to cations leading to a ... [more ▼]

Mastoparan X (MPX: INWKGIAAMAKKLL-NH2) belongs to a family of ionophoric peptides found in wasp venom. Upon binding to the membrane, MPX increases the cell's permeability to cations leading to a disruption in the electrolyte balance and cell lysis. This process is thought to occur either through a membrane-thinning mechanism, where the peptide resides on the membrane surface thereby disrupting lipid packing, or through formation of an oligomeric pore. To address this issue, we have used both high-resolution and solid-state 2H NMR techniques to study the structure and orientation of MPX when associated with bicelles. NOESY and chemical shift analysis showed that in bicelles, MPX formed a well-structured amphipathic alpha-helix. In zwitterionic bicelles, the helical axis was found to rest generally perpendicular to the membrane normal, which could be consistent with the "carpet" mechanism for lytic activity. In anionic bicelles, on the other hand, the helical axis was generally parallel to the membrane normal, which is more consistent with the pore model for lytic activity. In addition, MPX caused significant disruption in lipid packing of the negatively charged phospholipids. Taken together, these results show that MPX associates differently with zwitterionic membranes, where it rests parallel to the surface, compared with negatively charged membranes, where it penetrates longitudinally. [less ▲]

Detailed reference viewed: 12 (0 ULg)
See detailMerisier : les variétés multiclonales ont-elles un avenir ?
Curnel, Yanick; van de waele, Isabelle; Jacques, Dominique et al

in Silva Belgica (2001), 108(2), 32-37

Detailed reference viewed: 30 (5 ULg)
Full Text
Peer Reviewed
See detailDeep dysphasia : Further evidence on the relationship between phonological short-term memory and language processing impairments
Majerus, Steve ULg; Lekeu, Françoise ULg; Van der Linden, Martial ULg et al

in Cognitive Neuropsychology (2001), 18(5), 385-410

We report a cognitive investigation of a case of deep dysphasia appearing in the context of primary progressive aphasia. Over a period of 5 years, patient CO presented progressive difficulties in word ... [more ▼]

We report a cognitive investigation of a case of deep dysphasia appearing in the context of primary progressive aphasia. Over a period of 5 years, patient CO presented progressive difficulties in word finding and in oral comprehension, while nonverbal cognitive functions remained preserved. As in other deep dysphasic patients, CO's repetition performance showed marked imageability and lexicality effects, and semantic paraphasias. The same effects were observed in writing-to-dictation. Regularisation errors occurred in word reading. CO's short-term memory span was less than two words. A cognitive analysis of language processing revealed difficulties in phoneme identification and rhyme judgement, in detecting grammatical class for orally presented words, and in oral and written naming. The interpretation of CO's deep dysphasic symptoms within interactive models of language processing confirmed the importance of a phonological short-term storage impairment as an explanatory factor of deep dysphasia. [less ▲]

Detailed reference viewed: 55 (12 ULg)
Full Text
Peer Reviewed
See detailA New Design of Equilibrator to Monitor Carbon Dioxide in Highly Dynamic and Turbid Environments
Frankignoulle, M.; Borges, Alberto ULg; Biondo, Renzo ULg

in Water Research (2001), 35(5), 1344-7

A new design of equilibrator for carbon dioxide monitoring in natural waters is described. It consists in a vertical tube filled with marbles through which water is flowing while equilibrating with a ... [more ▼]

A new design of equilibrator for carbon dioxide monitoring in natural waters is described. It consists in a vertical tube filled with marbles through which water is flowing while equilibrating with a closed air circuit. It offers several advantages compared with classical equilibrators, among which is a fast response time (half-life constant approximately 30 s) and the potential to work in very turbid water. The proposed equilibrator is of particular interest to monitor carbon dioxide in coastal ecosystems, such as estuaries, which are known to be turbid and highly dynamic. Two performance tests and some field results are presented to illustrate the efficiency of the proposed system. [less ▲]

Detailed reference viewed: 36 (5 ULg)
Peer Reviewed
See detailMolecular bases of the interaction between human prolactin and its membrane receptor: A ten year study
KINET, Sandrina; BERNICHTEIN, Sophie; LLOVERA, Marta et al

in Recent research developments in endocrinology (2001), 2

In this review, we make a chronologically overview of a project aimed at deciphering the molecular bases of the mechanism by which prolactin, a pituitary-secreted polypeptidic hormone, interacts with its ... [more ▼]

In this review, we make a chronologically overview of a project aimed at deciphering the molecular bases of the mechanism by which prolactin, a pituitary-secreted polypeptidic hormone, interacts with its membrane receptor, a member of the cytokine receptor superfamily. This study, based essentially on structural and mutational analysis of human prolactin, has identified two regions interacting with the receptor, named binding sites 1 and 2. We have also provided evidence that prolactin induces dimerization of its receptor through its two binding sites, and based on that mechanism of activation, we have engineered and characterized prolactin antagonists able to block the effect of the hormone by competition for receptor binding. Our study has also highlighted the importance of using well characterized bioassays to monitor such a structure-function study since the properties of a given hormone analog were shown to strongly differ depending on the bioassay used. [less ▲]

Detailed reference viewed: 47 (4 ULg)
Peer Reviewed
See detailHeroic Fantasy et modernité: la problématique de la quête chez Michael Moorcock et Samuel R. Delany
Delville, Michel ULg

in Sources: Revue d'Etudes Anglophones (2001), 11

Detailed reference viewed: 140 (9 ULg)
Full Text
Peer Reviewed
See detailWHO Collaborating Centre consensus meeting on anti-cytokine therapy in rheumatoid arthritis
Emery, P.; Reginster, Jean-Yves ULg; Appelboom, T. et al

in Rheumatology (2001), 40(6), 699-702

Severe adult rheumatoid arthritis is a cause of progressive disability and increased mortality across Europe. A cure for the disease remains elusive, but control of symptoms and maintenance of individual ... [more ▼]

Severe adult rheumatoid arthritis is a cause of progressive disability and increased mortality across Europe. A cure for the disease remains elusive, but control of symptoms and maintenance of individual independence is possible. Anti-cytokine therapies offer a new approach to disease management. They are effective after the failure of full doses of methotrexate, and are at least as effective as methotrexate in retarding the progression of radiological changes. Until more is known about the long-term safety and efficacy of these drugs they should be reserved for patients with severe disease who are progressing despite adequate doses of methotrexate or other disease-modifying anti-rheumatic drugs. They should be continued until therapeutic failure or intolerance. A comprehensive health economic evaluation is needed to optimally direct the use of these drugs. This should be undertaken when long-term safety and efficacy studies are completed. [less ▲]

Detailed reference viewed: 15 (1 ULg)
Full Text
Peer Reviewed
See detailUrethral sphincterotomy for delivery of a vesical calculus in the mare: a case report
Deleuze, Stefan ULg; Hanzen, Christian ULg

in Annales de Médecine Vétérinaire (2001), 145(6, Suppl. S), 373-376

A case of a cystic calculus in a mare and the pathophysiology of urolithiasis are described. In this case a 268 g calculus measuring 9 x 6 cm was removed after urethro-sphincterotomy was performed on the ... [more ▼]

A case of a cystic calculus in a mare and the pathophysiology of urolithiasis are described. In this case a 268 g calculus measuring 9 x 6 cm was removed after urethro-sphincterotomy was performed on the standing mare. [less ▲]

Detailed reference viewed: 121 (10 ULg)
Full Text
Peer Reviewed
See detailEquilibrium charge-state distributions of sodium ions in carbon foil
Tordoir, Xavier ULg; Bastin, Thierry ULg; Dumont, Paul-Dominique ULg et al

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (2001), 173

The equilibrium charge-state distributions have been measured for sodium ions at the exit of a carbon foil for energies ranging from 0.43 to 1.66 Me V. A comparison of our results with available models is ... [more ▼]

The equilibrium charge-state distributions have been measured for sodium ions at the exit of a carbon foil for energies ranging from 0.43 to 1.66 Me V. A comparison of our results with available models is performed and an empirical formula for calculating the charge-state fractions of sodium ions is deduced. [less ▲]

Detailed reference viewed: 26 (9 ULg)
Full Text
Peer Reviewed
See detailPractical Aspects Of Computational Chemistry Calculations Through Pc Networks: The Ramses-Beowulf Implementation
Beuve-Mery, D.; Rahman, M.; Ducarme, P. et al

in Journal of Computational Chemistry (2001), 22(2), 172-7

We have built clusters of PC using up to 320 processors in parallel. The first cluster was built in 1996 from 64 computers. The parallel architectures are named RAMSES. In this article, we share our ... [more ▼]

We have built clusters of PC using up to 320 processors in parallel. The first cluster was built in 1996 from 64 computers. The parallel architectures are named RAMSES. In this article, we share our experience and discuss our choices. The architecture is composed of Pentium processors connected by a 100 Mbits/s Ethernet network. Because RAMSES are built of independent computers, the system is easily maintained, and can be modified by adding or removing machines. Two programs, which are dedicated to molecular modeling and were previously developed on single machines (OSIRIS and IMPALA), have been adapted. IMPALA models peptide and protein interaction with membranes, OSIRIS simulates an ab initio folding of globular proteins. After parallelization, each program consists of two parts: one is the human/RAMSES interface, and the second is the simulation per se. The parallel architecture is transparent for the users. Tests of the IMPALA and OSIRIS efficiencies are shown and discussed. [less ▲]

Detailed reference viewed: 23 (0 ULg)
Full Text
Peer Reviewed
See detailPalynology and sedimentology of laminites and tillites from the latest Famennian of the Parnaíba Basin, Brazil.
Streel, Maurice ULg; Caputo, M.V.; Loboziak, S et al

in Geologica Belgica (2001), 3(1-2), 87-96

Detailed reference viewed: 25 (1 ULg)
Peer Reviewed
See detailNatural radiative lifetimes in Ce II
Zhang, Z. G.; Svanberg, S.; Jiang, Z. et al

in Physica Scripta (2001), 63

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailRole of interface deformations in Benard-Marangoni instability
Lebon, Georgy ULg; Dauby, Pierre ULg; Regnier, Vincent

in Acta Astronautica (2001), 48(5-12), 617-627

Detailed reference viewed: 15 (2 ULg)
Peer Reviewed
See detailDynamics of mononuclear cadmium beta-lactamase revealed by the combination of NMR and PAC spectroscopy.
Hemmingsen, L.; Damblon, Christian ULg; Antony, J. et al

in Journal of the American Chemical Society (2001), 123(42), 10329-35

The two metal sites in cadmium substituted beta-lactamase from Bacillus cereus 569/H/9 have been studied by NMR spectroscopy ((1)H, (15)N, and (113)Cd) and PAC spectroscopy ((111m)Cd). Distinct NMR ... [more ▼]

The two metal sites in cadmium substituted beta-lactamase from Bacillus cereus 569/H/9 have been studied by NMR spectroscopy ((1)H, (15)N, and (113)Cd) and PAC spectroscopy ((111m)Cd). Distinct NMR signals from the backbone amides are identified for the apoenzyme and the mononuclear and binuclear cadmium enzymes. For the binuclear cadmium enzyme, two (113)Cd NMR signals (142 and 262 ppm) and two (111m)Cd PAC nuclear quadrupole interactions are observed. Two nuclear quadrupole interactions are also observed, with approximately equal occupancy, in the PAC spectra at cadmium/enzyme ratios < 1; these are different from those derived for the binuclear cadmium enzyme, demonstrating interaction between the two metal ion binding sites. In contrast to the observation from PAC spectroscopy, only one (113)Cd NMR signal (176 ppm) is observed at cadmium/enzyme ratios < 1. The titration of the metal site imidazole (N)H proton signals as a function of cadmium ion-to-enzyme ratio shows that signals characteristic for the binuclear cadmium enzyme appear when the cadmium ion-to-enzyme ratio is between 1 and 2, whereas no signals are observed at stoichiometries less than 1. The simplest explanation consistent with all data is that, at cadmium/enzyme ratios < 1, the single Cd(II) is undergoing exchange between the two metal sites on the enzyme. This exchange must be fast on the (113)Cd NMR time scale and slow on the (111m)Cd PAC time scale and must thus occur in a time regime between 0.1 and 10 micros. [less ▲]

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailMagnetic and conversion electron Mössbauer spectral study of amorphous thin films of DyxFe100-x and Dy20Fe80-yCoy
Fleury-Frenette, Karl ULg; Delwiche, Jacques ULg; Grandjean, Fernande ULg et al

in Journal of Applied Physics (2001), 90(4), 1934-1940

Amorphous thin films of DyxFe100-x and Dy20Fe80-yCoy, with various x and y values and of ∼40 nm thickness, have been prepared by sputtering on polyimide films. Their magnetization curves and the Mössbauer ... [more ▼]

Amorphous thin films of DyxFe100-x and Dy20Fe80-yCoy, with various x and y values and of ∼40 nm thickness, have been prepared by sputtering on polyimide films. Their magnetization curves and the Mössbauer spectra indicate that at 295 K the iron moments are preferentially oriented parallel to the film in Dy2Fe98 and that Dy6Fe94 is paramagnetic. The DyxFe100-x thin films, where x is 17, 20, 24, 29, 32, 35, and 37, show perpendicular magnetic anisotropies and moderate coercive fields of at most 150 kA/m, whereas the Dy20Fe80-yCoy thin films, where y is 8, 13, 16, and 20, thin films show stronger perpendicular anisotropies and larger coercive fields of ∼400 kA/m. The introduction of cobalt into the amorphous thin films increases their coercive field and the perpendicular magnetic anisotropy. The Mössbauer spectra of the DyxFe100-x and Dy20Fe80-yCoy amorphous thin films consist of broadened sextets which have been analyzed with a distribution of hyperfine fields by assuming that the iron moments are oriented perpendicular to the plane of the film. Detailed fits of the Mössbauer spectrum of Dy20Fe80 indicate that the cone angle of the iron magnetic moments cannot be determined with accuracy. The average hyperfine fields in the DyxFe100-x amorphous thin films are smaller than those in the crystalline dysprosium-iron intermetallic compounds. The average hyperfine field increases from ∼140 kOe in the DyxFe100-x films to ∼220 kOe in the Dy20Fe80-yCoy films, an increase which is in agreement with the increase in the saturation magnetization. The x dependence of the isomer shift indicates that there is strong dysprosium-iron bonding, whereas the y dependence of the isomer shift reveals an enhancement of the d-electron localization. From earlier x-ray magnetic circular dichroism results and the Mössbauer spectral results presented herein, iron magnetic moments of 0.87 or 0.67 μB, corresponding to 2.9 or 2.8 holes in the iron 3d band, have been obtained for the DyxFe100-x amorphous thin films with x greater or smaller than 27, respectively [less ▲]

Detailed reference viewed: 19 (1 ULg)
Full Text
Peer Reviewed
See detailAcquisition of a novel vocabulary in an amnesic patient
Van der Linden, Martial ULg; Cornil, Valérie; Meulemans, Thierry ULg et al

in Neurocase : Case Studies in Neuropsychology, Neuropsychiatry & Behavioural Neurology (2001), 7(4), 283-293

This study explored the ability of a severe amnesic patient (AC) to acquire new vocabulary words. We compared AC's knowledge of words entered into the French lexicon during three different periods: before ... [more ▼]

This study explored the ability of a severe amnesic patient (AC) to acquire new vocabulary words. We compared AC's knowledge of words entered into the French lexicon during three different periods: before 1920, between 1965 and 1985, and after 1986 (i.e. after the onset of his amnesia). AC's knowledge was assessed by asking him to give, for each word, its definition (word-definition task), the general domain Io which the word belonged ('domain' task), and to generate a sentence containing the word (sentence-generation task). Finally, we administered a recognition task in which AC had to select, for each word, its correct definition amongst four definitions. For all of these tasks, the results showed that AG's performance was similar to that of four control subjects matched for age, education, and profession. In particular, there was no difference with regard to AC's knowledge of words entered into the language after the onset of his amnesia. Therefore, these results indicate that, despite his profound amnesia, AC was able to learn normally new vocabulary words. More generally, they confirm that, at least is some cases, semantic learning can be spared in amnesia. [less ▲]

Detailed reference viewed: 16 (4 ULg)
Full Text
Peer Reviewed
See detailDistinct carbohydrate recognition domains of an invertebrate defense molecule recognize Gram-negative and Gram-positive bacteria.
Bilej, M.; De Baetselier, P.; Van Dijck, E. et al

in Journal of Biological Chemistry (2001), 276(49), 45840-7

Coelomic fluid of Eisenia foetida earthworms (Oligochaeta, Annelida) contains a 42-kDa defense molecule named CCF for coelomic cytolytic factor. By binding microbial antigens, namely the O-antigen of ... [more ▼]

Coelomic fluid of Eisenia foetida earthworms (Oligochaeta, Annelida) contains a 42-kDa defense molecule named CCF for coelomic cytolytic factor. By binding microbial antigens, namely the O-antigen of lipopolysaccharide (LPS), beta-1,3-glucans, or N,N'-diacetylchitobiose present, respectively, on Gram-negative bacteria or yeast cell walls, CCF triggers the prophenoloxidase activating pathway. We report that CCF recognizes lysozyme-predigested Gram-positive bacteria or the peptidoglycan constituent muramyl dipeptide as well as muramic acid. To identify the pattern recognition domains of CCF, deletion mutants were tested for their ability to reconstitute the prophenoloxidase cascade in E. foetida coelomic fluid depleted of endogenous CCF in the presence of LPS, beta-1,3-glucans, N,N'-diacetylchitobiose, and muramic acid. In addition, affinity chromatography of CCF peptides was performed on immobilized beta-1,3-glucans or N,N'-diacetylchitobiose. We found that the broad specificity of CCF for pathogen-associated molecular patterns results from the presence of two distinct pattern recognition domains. One domain, which shows homology with the polysaccharide and glucanase motifs of beta-1,3-glucanases and invertebrate defense molecules located in the central part of the CCF polypeptide chain, interacts with LPS and beta-1,3-glucans. The C-terminal tryptophan-rich domain mediates interactions of CCF with N,N'-diacetylchitobiose and muramic acid. These data provide evidence for the presence of spatially distinct carbohydrate recognition domains within this invertebrate defense molecule. [less ▲]

Detailed reference viewed: 12 (0 ULg)
Full Text
Peer Reviewed
See detailFurther investigation of the supervisory attentional system in schizophrenia: Planning, inhibition, and rule abstraction
Marczewski, P.; Van der Linden, Martial ULg; Laroi, Frank ULg

in Cognitive Neuropsychiatry (2001), 6(3), 175-192

Investigated supervisory attentional system (SAS) functions in schizophrenic patients. 15 schizophrenic outpatients (mean age 29.93 yrs) and 15 normal controls matched for age, gender, and educational ... [more ▼]

Investigated supervisory attentional system (SAS) functions in schizophrenic patients. 15 schizophrenic outpatients (mean age 29.93 yrs) and 15 normal controls matched for age, gender, and educational level were compared. Three tasks (Tower of London, Hayling, and Brixton tests) were used to examine 3 executive processes (planning, inhibition, and rule detection). Schizophrenic patients performed significantly worse than normal controls on all 3 tasks. In addition, patients' performances on selected measures of the three tests were correlated, even when age and medication were partialled out. It is concluded that patients are impaired on all SAS functions. The possible role of a general impairment (processing speed or cognitive resources) is discussed [less ▲]

Detailed reference viewed: 69 (3 ULg)
Full Text
See detailEvaluations internationales : Les enjeux du jour et de l'histoire
Baye, Ariane ULg

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2001), (7-8), 11-23

Detailed reference viewed: 36 (8 ULg)
Full Text
Peer Reviewed
See detailTransduction pathways involved in Hypoxia-Inducible Factor-1 phosphorylation and activation.
Minet, E.; Michel, G.; Mottet, Denis ULg et al

in Free Radical Biology & Medicine (2001), 31(7), 847-55

Hypoxia-Inducible Factor-1 (HIF-1) is a transcription factor which is activated by hypoxia and involved in the adaptative response of the cell to oxygen deprivation. During hypoxic stress, HIF-1 triggers ... [more ▼]

Hypoxia-Inducible Factor-1 (HIF-1) is a transcription factor which is activated by hypoxia and involved in the adaptative response of the cell to oxygen deprivation. During hypoxic stress, HIF-1 triggers the overexpression of genes coding for glycolytic enzymes and angiogenic factors. To be active HIF-1 must be phosphorylated. HIF-1 is a substrate for various kinase pathways including PI-3K and the MAP kinases ERK and p38. Several transduction pathways have been proposed which act downstream of putative oxygen sensors and lead to the activation of these kinases. In this review, we summarize some of the latest advances describing the possible signaling pathways leading to HIF-1 phosphorylation and subsequent activation. The physiological relevance of these regulations is also discussed. [less ▲]

Detailed reference viewed: 23 (1 ULg)
Peer Reviewed
See detailContrebande de cigarettes: un exemple moderne de délinquance d'entreprise
Dantinne, Michaël ULg

in Revue Internationale de Criminologie et de Police Technique et Scientifique [= RICPTS] (2001), (1), 3-25

Detailed reference viewed: 99 (9 ULg)
Full Text
Peer Reviewed
See detailN content of phloem and xylem exudates during the transition to flowering in Sinapis alba and Arabidopsis thaliana
Corbesier, Laurent; Havelange, Andrée ULg; Lejeune, Pierre et al

in Plant, Cell & Environment (2001), 24

The involvement of nitrogenous substances in the transition to flowering was investigated in Sinapis alba and Arabidopsis thaliana (Columbia). Both species grown in short days (SD) are induced to flower ... [more ▼]

The involvement of nitrogenous substances in the transition to flowering was investigated in Sinapis alba and Arabidopsis thaliana (Columbia). Both species grown in short days (SD) are induced to flower by one long day (LD). In S. alba, the phloem sap (leaf and apical exudates) and the xylem sap (root exudate) were analysed in LD versus SD. In A. thaliana, only the leaf exudate could be analysed but an alternative system for inducing flowering without day-length extension was used: the displaced SD (DSD). Significant results are: (i) in both species, the leaf exudate was enriched in Gln during the inductive LD, at a time compatible with export of the floral stimulus; (ii) in S. alba, the root export of amino acids decreased in LD, whereas the nitrate remained unchanged - thus the extra-Gln found in the leaf exudate should originate from the leaves; (iii) extra-Gln was also found very early in the apical exudate of S. alba in LD, together with more Glu; (iv) in A. thaliana induced by one DSD, the leaf export of Asn increased sharply, instead of Gln in LD. This agrees with Asn prevalence in C-limited plants. The putative role of amino acids in the transition to flowering is discussed. [less ▲]

Detailed reference viewed: 90 (2 ULg)
Full Text
Peer Reviewed
See detailLe kimbanguisme : un millénarisme dynamique de la terre aux Cieux
Melice, Anne ULg

in Bulletin des Séances de l’Académie Royale des Sciences d’Outre-Mer = Mededelingen der Zittingen van de Koninklijke Academie voor Overzeese Wetenschappen (2001), 47 (suppl.)

Detailed reference viewed: 108 (11 ULg)
Full Text
Peer Reviewed
See detailCombined Effects of Experimental Heavy-Metal Contamination (Cu, Zn, and CH3Hg) and Starvation on Quail's Body Condition: Parallelism with a Wild Common Guillemot (Uria aalge) Population Found Stranded at the Belgian Coast
Debacker, Virginie ULg; Rutten, Astrid; Jauniaux, Thierry ULg et al

in Biological Trace Element Research (2001), 82(1-3, Summer), 87-107

Combined effects of heavy-metal contamination (Cu, Zn, and CH3Hg) and starvation were tested on common quails (Coturnix coturnix japonica) and used as a model for comparison with a wild common guillemot ... [more ▼]

Combined effects of heavy-metal contamination (Cu, Zn, and CH3Hg) and starvation were tested on common quails (Coturnix coturnix japonica) and used as a model for comparison with a wild common guillemot (Uria aalge) population found stranded at the Belgian coast. Appropriate heavy-metal levels were given to the quails to obtain concentrations similar to those found in the seabirds's tissues. The contaminated animals were then starved for 4 d to simulate the evident malnutrition symptoms observed at the guillemot's level. In such conditions, food intake and total-body weight are shown to decrease in contaminated individuals with simultaneous significant hepatic and renal increase of the heavy-metal concentrations. Like guillemots, higher heavy-metal levels were observed in those contam- inated quails that had also developed a cachectic status characterized by a general atrophy of their pectoral muscle and complete absence of subcutaneous and/or abdominal fat depots. Although likely the result of a general protein catabolism during starvation, it is suggested that these higher metal levels could as well enhance a general muscle wasting process (cachectic status). [less ▲]

Detailed reference viewed: 35 (6 ULg)
Peer Reviewed
See detailRépercussions systémiques des infections parodontales: définition d'un nouvel index parodontal
Geerts, Sabine ULg; Rompen, Eric ULg

in Actualités Dentaires de l'Université de Liège (2001), 207

Detailed reference viewed: 56 (4 ULg)
Peer Reviewed
See detailAbout the relationship between the kallikrein-kinin system and insulin
Damas, Jacques ULg; Liégeois, Jean-François ULg

in Current Topics in Peptide and Protein Research (2001), 4

Detailed reference viewed: 20 (2 ULg)
Full Text
Peer Reviewed
See detailClinical and economic impact of diabetes mellitus on percutaneous and surgical treatment of multivessel coronary disease patients: insights from the Arterial Revascularization Therapy Study (ARTS) trial.
Abizaid, A.; Costa, M. A.; Centemero, M. et al

in Circulation (2001), 104(5), 533-8

BACKGROUND: Our aims were to compare coronary artery bypass grafting (CABG) and stenting for the treatment of diabetic patients with multivessel coronary disease enrolled in the Arterial Revascularization ... [more ▼]

BACKGROUND: Our aims were to compare coronary artery bypass grafting (CABG) and stenting for the treatment of diabetic patients with multivessel coronary disease enrolled in the Arterial Revascularization Therapy Study (ARTS) trial and to determine the costs of these 2 treatment strategies. METHODS AND RESULTS: Patients (n=1205) were randomly assigned to stent implantation (n=600; diabetic, 112) or CABG (n=605; diabetic, 96). Costs per patient were calculated as the product of each patient's use of resources and the corresponding unit costs. Baseline characteristics were similar between the groups. At 1 year, diabetic patients treated with stenting had the lowest event-free survival rate (63.4%) because of a higher incidence of repeat revascularization compared with both diabetic patients treated with CABG (84.4%, P<0.001) and nondiabetic patients treated with stents (76.2%, P=0.04). Conversely, diabetic and nondiabetic patients experienced similar 1-year event-free survival rates when treated with CABG (84.4% and 88.4%). The total 1-year costs for stenting and CABG in diabetic patients were $12 855 and $16 585 (P<0.001) and in the nondiabetic groups, $10 164 for stenting and $13 082 for surgery. CONCLUSIONS: Multivessel diabetic patients treated with stenting had a worse 1-year outcome than patients assigned to CABG or nondiabetics treated with stenting. The strategy of stenting was less costly than CABG, however, regardless of diabetic status. [less ▲]

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailEnhanced survival of lung granulocytes in an animal model of asthma: evidence for a role of GM-CSF activated STAT5 signalling pathway
Turlej, Renata K; Fievez, Laurence ULg; Sandersen, Charlotte ULg et al

in Thorax (2001), 56(9), 696-702

As granulocyte/macrophage colony stimulating factor (GM-CSF) mediated delay of granulocyte apoptosis contributes to the accumulation of inflammatory cells at the site of inflammation in many diseases, we ... [more ▼]

As granulocyte/macrophage colony stimulating factor (GM-CSF) mediated delay of granulocyte apoptosis contributes to the accumulation of inflammatory cells at the site of inflammation in many diseases, we sought to determine whether asthma is also associated with a GM-CSF dependent increase in lung granulocyte survival. Moreover, because GM-CSF mediates its effects through activation of signal transducer and activator of transcription 5 (STAT5), we also investigated the potential role of STAT5 in allergic inflammation. METHODS: Blood granulocytes were recovered from six healthy and six heaves affected horses, a model of asthma. Lung granulocytes were obtained by bronchoalveolar lavage (BAL) from the same horses. Granulocytes were cultured in the presence or absence of anti-GM-CSF receptor antibodies for different times and apoptosis was determined using the Annexin-V/propidium iodide detection method. Nuclear protein extracts from cultured granulocytes were analysed for STAT5 binding activity by electrophoretic mobility shift assay. RESULTS: BAL fluid granulocytes from heaves affected horses demonstrated a significant delay in apoptosis compared with blood granulocytes from the same horses and blood and BAL fluid granulocytes from healthy horses. Conversely, the rate of apoptosis in blood granulocytes from healthy and heaves affected horses was comparable. The enhanced survival of BAL fluid granulocytes from affected horses was suppressed in the presence of antibodies directed against GM-CSF receptors. Increased levels of active STAT5 were found in BAL fluid granulocytes from heaves affected horses and were markedly reduced after treatment with anti-GM-CSF receptor antibodies. CONCLUSIONS: These data indicate that granulocyte survival is enhanced in the lung of heaves affected horses and suggest a role for a GM-CSF activated STAT5 pathway in delaying apoptosis of lung granulocytes in this model of asthma. [less ▲]

Detailed reference viewed: 51 (6 ULg)
Full Text
Peer Reviewed
See detailPrediction of protein digestibility in dog food by a multi-enzymatic method: a useful technique to develop.
Tonglet, Catherine; Jeusette, Isabelle; Istasse, Louis ULg et al

in Journal of Animal Physiology & Animal Nutrition (2001), 85(7-8), 189-94

The multi-enzymatic method with constant pH described by Dufour-Etienne et al. (Rec. Med. Vet. 168, 789-796, 1992) was tested using 17 industrial dry dog foods and two ingredients, sodium caseinate and ... [more ▼]

The multi-enzymatic method with constant pH described by Dufour-Etienne et al. (Rec. Med. Vet. 168, 789-796, 1992) was tested using 17 industrial dry dog foods and two ingredients, sodium caseinate and beef meat, which were used as references. The quantity of sodium hydroxide added to the enzymatic solution was measured after incubation times of 2, 5 and 10 min and the best prediction of the apparent protein digestibility was obtained with an incubation time fixed at 2 min. The volume of sodium hydroxide 0.1 N constantly added to maintain the pH of the solution at 8 was correlated to the value of in vivo digestibility of the protein measured in the dog. The correlation coefficient obtained was 0.90 with a standard error of the regression of 1.9 for all samples. The correlation coefficients calculated for incubation times of 5 and 10 min were lower than that at 2 min; thus an incubation period of 2 min provided the highest correlation coefficient for this multi-enzymatic method at constant pH. However, considering the lack of samples with an apparent protein digestibility ranging between 85 and 95%, the slope of the regression line and the correlation coefficient were strongly influenced by the ingredients, such that when the correlation coefficient was calculated for 17 dog foods without the reference ingredients, a coefficient of 0.71 (+/- 1.9) was obtained. These tests of in vitro digestibility are valuable to predict the apparent digestibility of the protein in the dog, but, it is essential to confirm the results by an in vivo test. [less ▲]

Detailed reference viewed: 56 (3 ULg)
Peer Reviewed
See detailTransfer of Tilapia (Oreochromis niloticus) to a hyperosmotic environment is associated with sustained expression of prolactin receptor in intestine, gill and kidney
Sandra, O.; Le Rouzic, P.; Rentier-Delrue, Françoise ULg et al

in General and Comparative Endocrinology (2001)

Expression of tilapia prolactin receptor (tiPRL-R) has been characterised in the intestine, gill and kidney of tilapia species Oreochromis niloticus and the levels of both tiPRL-R transcripts and tiPRL ... [more ▼]

Expression of tilapia prolactin receptor (tiPRL-R) has been characterised in the intestine, gill and kidney of tilapia species Oreochromis niloticus and the levels of both tiPRL-R transcripts and tiPRL binding sites have been analysed in these organs during adaptation tilapia to a hyperosmotic environment. [less ▲]

Detailed reference viewed: 16 (2 ULg)
Full Text
Peer Reviewed
See detailModèle de productivité et tarif de cubage des peuplements de teck (tectona grandis L. F.) au Sud-Bénin
Fonton, N. H.; Palm, Rodolphe ULg; Akossou, A. Y. J. et al

in Annales des Sciences Agronomiques du Bénin (2001), 2(2), 209-224

This study aims to build site index model and stem volume function of pure, even aged and relatively homogeneous teak stands in south Benin. The characteristics of the stands were obtained from the ... [more ▼]

This study aims to build site index model and stem volume function of pure, even aged and relatively homogeneous teak stands in south Benin. The characteristics of the stands were obtained from the inventory of 104 temporary plots sampled from stands with different ages and fertility. The stem analysis of 19 dominant trees wer used to establish, by serial regression, a model giving the evolution of top height according to the age. The site index curves were built in order to determine site index of the stands. The estimated volume function obtained shows that age, site index and basal area are the main stand parameters of stem volume funtion. [less ▲]

Detailed reference viewed: 80 (4 ULg)
Full Text
Peer Reviewed
See detailExpression of Cu/Zn and Mn superoxide dismutases during bovine embryo development: influence of in vitro culture.
Lequarré, Anne-Sophie ULg; Feugang, Jean-Magloire; Malhomme, Olivier et al

in Molecular Reproduction and Development (2001), 58(1), 45-53

Temporal pattern of expression of Cu/Zn and Mn superoxide dismutases (SODs) was investigated in bovine oocytes and embryos produced in vitro in two different culture conditions and in vivo after ... [more ▼]

Temporal pattern of expression of Cu/Zn and Mn superoxide dismutases (SODs) was investigated in bovine oocytes and embryos produced in vitro in two different culture conditions and in vivo after superovulation. SODs were examined at a transcriptional level in single oocytes and embryos by reverse transcriptase-polymerase chain reaction (RT-PCR) and, at a protein level, by Western blotting on pools of embryos. mRNA encoding Cu/Zn SOD were detected in in vitro bovine embryos throughout preattachment development as well as in in vivo derived morulae and blastocysts. Transcripts for Mn SOD gene were detected in most immature and in vitro matured oocytes as well as in some zygotes and 5- to 8-cell embryos while no transcript was found at the 9-to 16-cell stage in both culture conditions. In vitro embryonic expression of Mn SOD was detected earlier in the presence of serum. Half of the morulae showed the transcript if cultured with 5% serum while none without serum. At the blastocyst stage Mn SOD could be detected independently of culture conditions. For in vivo-derived embryos Mn SOD transcripts were detected both in morulae and blastocysts. Immunoblotting analyses revealed that Cu/Zn SOD and Mn SOD were also present at a protein level in in vitro-derived zygotes and blastocysts. Together these data demonstrate, for the first time, that Mn SOD is transcribed and that Cu/Zn and Mn SOD proteins are expressed in preimplantation bovine embryos. Finally, they suggest that Mn SOD transcription is altered by in vitro culture conditions. [less ▲]

Detailed reference viewed: 154 (6 ULg)
Full Text
Peer Reviewed
See detailThe acquired brain injuries in the term and preterm babies: an update on their pathophysiology
Battisti, Oreste ULg; Adant-François, A.; Scalais, E. et al

in Journal du Pédiatre Belge (2001), 3

Detailed reference viewed: 41 (8 ULg)
Peer Reviewed
See detailL'expertise pénale en matière de responsabilité médicale
Boxho, Philippe ULg

in Consilio manuque (2001), 28

Detailed reference viewed: 56 (0 ULg)
Full Text
Peer Reviewed
See detailPositron emission tomography (PET) with 18F-fluorodeoxyglucose (18F-FDG) for the staging of low-grade non-Hodgkin's lymphoma (NHL).
Jerusalem, Guy ULg; Beguin, Yves ULg; Najjar, F. et al

in Annals of Oncology (2001), 12(6), 825-30

BACKGROUND: Although PET has been shown to be highly sensitive in the primary staging of lymphoma, previous studies with small numbers of patients indicated that low-grade NHL may not always be adequately ... [more ▼]

BACKGROUND: Although PET has been shown to be highly sensitive in the primary staging of lymphoma, previous studies with small numbers of patients indicated that low-grade NHL may not always be adequately detected by PET. We undertook this study to determine factors influencing the detection of lesions by PET in low-grade NHL and to evaluate the utility of PET in this indication. PATIENTS AND METHODS: Forty-two patients underwent conventional staging procedures (clinical examination, oto-rhino-laryngologic examination, computed tomography of the chest, abdomen and pelvis, gastroscopy and bone marrow biopsy as well as whole-body non-attenuation corrected 18F-FDG-PET RESULTS: PET detected 40% more abnormal lymph node areas than conventional staging in follicular lymphoma but was inappropriate for the staging of small lymphocytic lymphoma where it detected less than 58% of abnormal lymph node areas. PET showed more lesions than conventional staging for peripheral (34% more lymph node areas detected) and thoracic lymph node (39% more) areas but not for abdominal or pelvic lymph nodes (26% fewer areas detected). The sensitivity to detect bone marrow infiltration was unacceptably low for PET. In contrast, PET was as effective as standard procedures for the detection of other extranodal localizations, although a few localizations were detected only by PET and a few others only by conventional procedures. CONCLUSIONS: PET may contribute to the management of patients with low-grade follicular NHL. For the other low-grade lymphoma subtypes, the role of PET is less evident. Further studies using PET to evaluate the results of treatment or to diagnose disease recurrence are warranted in low-grade follicular NHL. [less ▲]

Detailed reference viewed: 66 (19 ULg)
See detailRevising the judicial architecture of the European Union
Munoz, Rodolphe ULg

in Yearbook of European law (2001), 19

L'article reprend l'ensemble des propositions faites à l'époque par la doctrine concernant les modifications à apporter à l'architecture juridique de l'Union. Chacun des articles du contentieux est ... [more ▼]

L'article reprend l'ensemble des propositions faites à l'époque par la doctrine concernant les modifications à apporter à l'architecture juridique de l'Union. Chacun des articles du contentieux est analysée et des propositions concrètes de mofdifications sont faites. [less ▲]

Detailed reference viewed: 57 (1 ULg)
Full Text
Peer Reviewed
See detailLa lecture littéraire : le pour et le contre
Dumortier, Jean-Louis ULg

in Education-Formation (2001), 262

Detailed reference viewed: 34 (3 ULg)
Peer Reviewed
See detailResponsabilité pénale et faute pénale
Boxho, Philippe ULg

in Revue Médicale de Liège (2001), 56

Detailed reference viewed: 30 (2 ULg)
Full Text
Peer Reviewed
See detailNucleon nucleon scattering in a chiral constituent quark model
Bartz, Daniel ULg; Stancu, Floarea ULg

in Physical Review. C : Nuclear Physics (2001), C63

We study the nucleon-nucleon interaction in a chiral constituent quark model by using the resonating group method, convenient for treating the interaction between composite particles. The calculated phase ... [more ▼]

We study the nucleon-nucleon interaction in a chiral constituent quark model by using the resonating group method, convenient for treating the interaction between composite particles. The calculated phase shifts for the $^3S_1$ and $^1S_0$ channels show the presence of a strong repulsive core due to the combined effect of the quark interchange and the spin-flavour structure of the effective quark-quark interaction. Such a symmetry structure stems from the pseudoscalar meson exchange between the quarks and is a consequence of the spontaneous breaking of the chiral symmetry. We perform single and coupled channel calculations and show the role of coupling of the $\Delta\Delta$ and hidden color $CC$ channels on the behaviour of the phase shifts. [less ▲]

Detailed reference viewed: 7 (3 ULg)
Full Text
Peer Reviewed
See detailQuantitative cell dispersion analysis: new test to measure tumor cell aggressiveness
Nawrocki-Raby, Béatrice; Polette, Myriam; Gilles, Christine ULg et al

in International Journal of Cancer = Journal International du Cancer (2001), 93(5), 644-52

Tumor progression requires the dispersion of epithelial cells from neoplastic clusters and cell invasion of adjacent stromal connective tissue. Aiming at demonstrating the precise relationships between ... [more ▼]

Tumor progression requires the dispersion of epithelial cells from neoplastic clusters and cell invasion of adjacent stromal connective tissue. Aiming at demonstrating the precise relationships between cell dispersion and cell invasion, related respectively to expression of E-cadherin/catenin complex and matrix metalloproteinases (MMPs), we developed an original in vitro model of cell dispersion analysis. Our study reports the validation of this model that allowed us to analyze and quantify the cell cohesion level by means of time-lapse videomicroscopy and computer analysis based on the observation of spatial and temporal cell distribution. Our model was able to distinguish 2 groups among different human bronchial and mammary epithelial cells previously characterized for the expression of E-cadherin/catenin complex and MMPs and their invasive capacity in the Boyden chamber assay. The first group (16HBE14o-, MCF-7, T47D) that expressed membranous E-cadherin and -catenin, and was negative for MMP-2 expression and non-invasive, displayed a highly cohesive pattern corresponding to a cluster spatial distribution. The second group (Beas2B, BZR, BZR-T33, MDA-MB-231, MDA-MB-435, BT549 and HS578T) that was invasive and showed lack of expression of E-cadherin and a cytoplasmic redistribution of -catenin, displayed a dispersed pattern corresponding to a random spatial distribution. Downregulation of E-cadherin by a blocking antibody induced a more random distribution. Conversely, expression of E-cadherin by cDNA transfection induced a cluster distribution. Moreover, tumor cell lines that co-expressed MT1-MMP and MMP-2 (Beas2B, BZR, BZR-T33, MDA-MB-435, BT549 and HS578T) showed a more dispersed pattern than tumor cell lines that did not express MMP-2 (MDA-MB-231). In conclusion, we demonstrated that the spatial group behavior of cell lines, i.e., their cohesion/dispersion ability, reflects their invasive properties. Thus, this model of cell dispersion analysis may represent a new test to measure tumor cell aggressiveness. [less ▲]

Detailed reference viewed: 51 (10 ULg)
Full Text
Peer Reviewed
See detailStability of perturbed functional differential equations and stabilization of nonlinear cascades
Michiels, Wim; Sepulchre, Rodolphe ULg; Roose, Dirk

in SIAM Journal on Control & Optimization (2001), 40

In this paper the effect of bounded input perturbation on the stability of nonlinear globally asymptotically stable delay differential equations is analyzed. We investigate under which conditions global ... [more ▼]

In this paper the effect of bounded input perturbation on the stability of nonlinear globally asymptotically stable delay differential equations is analyzed. We investigate under which conditions global stability in preserved and if not, whether semi-global stabilization is possible by controlling the size or shape of the perturbation. This results in a general framework, in which the stabilization of partial linear cascade systems using partial state feedback can be treated systematically. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
Peer Reviewed
See detailGeological application of digital imaging
Pirard, Eric ULg; Jongmans, Denis; Marsh, Stuart

in Computers & Geosciences (2001), 27(9), 1015-1017

Detailed reference viewed: 26 (1 ULg)
Full Text
Peer Reviewed
See detailThe influence of stent length on clinical and angiographic outcome in patients undergoing elective stenting for native coronary artery lesions; final results of the Magic 5L Study.
Foley, D. P.; Pieper, M.; Wijns, W. et al

in European heart journal (2001), 22(17), 1585-93

AIMS: To prospectively evaluate the influence of stent length on 6 month clinical and angiographic outcome, in patients with native coronary lesions up to 45 mm in length, undergoing elective Magic ... [more ▼]

AIMS: To prospectively evaluate the influence of stent length on 6 month clinical and angiographic outcome, in patients with native coronary lesions up to 45 mm in length, undergoing elective Magic Wallstent implantation. METHODS AND RESULTS: On the basis of pre-procedural angiography, 276 patients (aged 61.3+/-10.2 years; 78.6% male; 41.7% unstable angina) with a total of 302 lesions were prospectively assigned to one of five different length categories of Magic Wallstent. Angiography in multiple matched projections before and after implantation and at 6 months follow-up was analysed at the core laboratory. Primary end-points for the efficacy analysis were cumulative incidence of major adverse cardiac events and quantitative coronary angiography analysis 6 months after stent implantation. Magic Wallstent implantation was successful in 301 of 302 lesions and in 98.6% a residual stenosis <20% by online quantitative coronary angiography was achieved. At 30 days, 6.2% (1.8% subacute occlusion) of patients had experienced major adverse cardiac events, 27.5% at 6 months and 30.4% at 9 months. Angiographic restenosis occurred in 37%. Restenosis rates for the mini, extra-short, short, medium and long Wallstent groups were 25.9%, 25%, 22.6%, 36.2% and 67.5%, respectively. Multivariate analysis revealed stent length to be independently associated with greater angiographic restenosis and major adverse cardiac events. CONCLUSIONS: While shorter Magic Wallstents provided late outcomes comparable with short balloon-expandable stents, excessive restenosis with longer Wallstents should obviate their use in elective percutaneous intervention. Long coronary lesions provide a challenging substrate for emerging antirestenosis therapies, such as stent coatings and brachytherapy. [less ▲]

Detailed reference viewed: 1 (0 ULg)
Full Text
See detailÉvolution des accessibilités et des mobilités des localisations commerciales
Merenne-Schoumaker, Bernadette ULg

in Travaux de l’Institut de Géographie de Reims (2001), 27(107-108), 7-23

In order to be able to study the links between the evolution of accessibilities and mobilities and the dynamics of the commercial localizations, the article has been organized in three parts : firstly ... [more ▼]

In order to be able to study the links between the evolution of accessibilities and mobilities and the dynamics of the commercial localizations, the article has been organized in three parts : firstly, the definition of the concepts of accessibility and mobility as well as the distance; secondly, analysis of the role of these two concepts in the commercial field and the their most evident recent evolutions; lastly, research into corresponding links. On the basis of this work, everything indicates the priority of mobility over accessibility as well as very close relations between the mutations of urbanized territories and the installation of the new commercial framework, which is strongly governed by car mobility. [less ▲]

Detailed reference viewed: 223 (3 ULg)
Full Text
Peer Reviewed
See detailMicro-analyse des mécanismes de la reprise démographique des villages de l'Ardenne du Nord-Est : le cas de Burtonville
Schmitz, Serge ULg

in Espace, Populations, Sociétés (2001)

If they are well selected, macro scale analyses permit to underline some mechanisms that remain hidden or are difficult to distinguish with micro scale analysis. The populations' stories an history of ... [more ▼]

If they are well selected, macro scale analyses permit to underline some mechanisms that remain hidden or are difficult to distinguish with micro scale analysis. The populations' stories an history of Burtonville in their regional context show : - lags of demographic revivals between villages and small towns - relevance of material constraints inherent in a small village for the demographic development - relevance of landed property and genealogy for the village evolution - links between demographic and economic evolutions - diversification of environmental aspirations and their results on migrations. [less ▲]

Detailed reference viewed: 42 (11 ULg)
Full Text
Peer Reviewed
See detailDetection of the 67-kD laminin receptor in prostate cancer biopsies as a predictor of recurrence after radical prostatectomy.
Waltregny, David ULg; De Leval, Laurence ULg; Coppens, Luc ULg et al

in European Urology (2001), 40(5), 495-503

OBJECTIVES: Reliable prognostic indicators are needed for a better pretherapeutic assessment of the agressiveness of organ-confined prostate cancer (PC) lesions. The 67-kD laminin receptor (67LR) is a ... [more ▼]

OBJECTIVES: Reliable prognostic indicators are needed for a better pretherapeutic assessment of the agressiveness of organ-confined prostate cancer (PC) lesions. The 67-kD laminin receptor (67LR) is a cell-surface-associated protein involved in the acquisition of the invasive and metastatic phenotype of a variety of human cancer cell types. We have previously shown that 67LR detection in PC tissues from radical prostatectomy (RP) specimens is an independent predictor of biochemical (PSA) relapse in patients with clinically localized PC. In this study, we assessed 67LR detection in diagnostic PC biopsies as a predictor of biochemical relapse after RP. METHODS: Diagnostic biopsy and subsequent RP tissue specimens from 151 patients with clinically localized PC were immunohistochemically analyzed for 67LR expression. The level of 67LR expression was evaluated by both intensity and extent of the staining. Clinicopathological preoperative and postoperative parameters, including 67LR expression, were correlated with each other and tested as predictors of biochemical relapse. RESULTS: 67LR was detected in 67.5 and 68.2% of biopsies and RPs, respectively. 67LR detection in RP specimens was an independent predictor of relapse. The level of 67LR expression in the biopsy was significantly associated with the biopsy Gleason score (p<0.05) but failed to predict the pathological stage (p>0.1). Biochemical progression-free estimates for patients whose biopsy did or did not express the protein differed with only borderline statistical significance (p = 0.05). Multivariate analysis identified biopsy Gleason score as the only independent preoperative predictor of recurrence. Significant discrepancies in levels of 67LR expression were found between matched biopsy and RP specimens (p<0.05), with exact agreement rates <40%. CONCLUSIONS: 67LR detection in PC biopsies was not a significant preoperative predictor of outcome after RP. Heterogeneity of 67LR expression and biopsy sampling errors most likely represented the main reasons for discordant results between biopsy and RP specimens. [less ▲]

Detailed reference viewed: 104 (7 ULg)
Full Text
Peer Reviewed
See detailStratification of single-vessel coronary stenosis by ischemic threshold at the onset of wall motion abnormality during continuous monitoring of left ventricular function by semisupine exercise echocardiography.
Garot, J.; Hoffer, E. P.; Monin, J. L. et al

in Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography (2001), 14(8), 798-805

We studied the relation between the ischemic threshold at the onset of wall motion abnormality on exercise echocardiography (EE) and the severity of coronary stenosis in patients with 1-vessel coronary ... [more ▼]

We studied the relation between the ischemic threshold at the onset of wall motion abnormality on exercise echocardiography (EE) and the severity of coronary stenosis in patients with 1-vessel coronary artery disease (CAD). We screened 216 consecutive patients who underwent coronary angiography and EE for suspected CAD. Ninety-five (74 men; age, 56 +/- 12 years) satisfied the study criteria, that is, the presence of 1-vessel disease or no evidence of CAD on angiography and a normal baseline echocardiogram. Eighty-seven patients had 1-vessel CAD on angiography, and exercise-induced wall motion abnormality occurred in 73 (77%). Optimal cutoff values of percent diameter stenosis and minimal lumen diameter for predicting a positive EE were 61% (sensitivity and specificity of 76%) and 1.12 mm (sensitivity and specificity of 74%). Among patients with positive EE, heart rate-blood pressure product at ischemic threshold was correlated with quantitative coronary stenosis (r = -0.72, P <.001). The ischemic threshold from continuous monitoring of left ventricular function during semisupine EE is correlated with the severity of coronary stenosis among patients with 1-vessel disease and a normal resting echocardiogram. [less ▲]

Detailed reference viewed: 19 (0 ULg)
Full Text
Peer Reviewed
See detailPlant monitoring and fault detection - Synergy between data reconciliation and principal component analysis
Amand, Thierry; Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Computers & Chemical Engineering (2001), 25(4-6), 501-507

Data reconciliation and principal component analysis are tno recognised statistical methods used for plant monitoring and fault detection. We propose to combine them for increased efficiency. Data ... [more ▼]

Data reconciliation and principal component analysis are tno recognised statistical methods used for plant monitoring and fault detection. We propose to combine them for increased efficiency. Data reconciliation is used in the first step of the determination of the projection matrix for principal component analysis (eigenvectors). principal component analysis can then be applied to raw process data for monitoring purpose. The combined use of these techniques aims at a better efficiency in fault detection. It relies mainly in a lower number of components to monitor. The method is applied to a modelled ammonia synthesis loop. (C) 2001 Elsevier Science Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 34 (6 ULg)
Full Text
Peer Reviewed
See detailRandomized, placebo-controlled trial of the anti-tumor necrosis factor antibody fragment afelimomab in hyperinflammatory response during severe sepsis: The RAMSES Study
Reinhart, Konrad; Menges, Thilo; Gardlund, Bengt et al

in Critical Care Medicine (2001), 29(4), 765-769

Objective: This study investigated whether treatment with the anti-tumor necrosis factor-a monoclonal antibody afelimomab would improve survival in septic patients with serum interleukin (IL)-6 ... [more ▼]

Objective: This study investigated whether treatment with the anti-tumor necrosis factor-a monoclonal antibody afelimomab would improve survival in septic patients with serum interleukin (IL)-6 concentrations of >1000 pg/mL. Design: Multicenter, double-blind, randomized, placebo-controlled study. Setting: Eighty-four intensive care units in academic medical centers in Europe and Israel. Patients: A total of 944 septic patients were screened and stratified by the results of a rapid qualitative immunostrip test for serum IL-6 concentrations. Patients with a positive test kit result indicating IL-6 concentrations of >1000 pg/mL were randomized to receive either afelimomab (n 5 224) or placebo (n 5 222). Patients with a negative IL-6 test (n 5 498) were not randomized and were followed up for 28 days. Interventions: Treatment consisted of 15-min infusions of 1 mg/kg afelimomab or matching placebo every 8 hrs for 3 days. Standard surgical and intensive care therapy was otherwise delivered. Measurements and Main Results: The study was terminated prematurely after an interim analysis estimated that the primary efficacy end points would not be met. The 28-day mortality rate in the nonrandomized patients (39.6%, 197 of 498) was significantly lower (p < .001) than that found in the randomized patients (55.8%, 249 of 446). The mortality rates in the IL-6 test kit positive patients randomized to afelimomab and placebo were similar, 54.0% (121 of 224) vs. 57.7% (128 of 222), respectively. Treatment with afelimomab was not associated with any particular adverse events. Conclusions: The IL-6 immunostrip test identified two distinct sepsis populations with significantly different mortality rates. A small (3.7%) absolute reduction in mortality rate was found in the afelimomab-treated patients. The treatment difference did not reach statistical significance. [less ▲]

Detailed reference viewed: 28 (0 ULg)
Full Text
Peer Reviewed
See detailBiogeography and ecology of paedomorphosis in Triturus alpestris (Amphibia, Caudata)
Denoël, Mathieu ULg; Duguet, R.; Džukić, Georg et al

in Journal of Biogeography (2001), 28(10), 1271-1280

Aim Paedomorphosis is an evolutionary change in which larval structures are retained in adult animals. In newts and salamanders, this heterochronic process is widely represented and concerns the retention ... [more ▼]

Aim Paedomorphosis is an evolutionary change in which larval structures are retained in adult animals. In newts and salamanders, this heterochronic process is widely represented and concerns the retention of gill slits. We want to find out whether ecological and geographical determinants may be associated with paedomorphosis in the Alpine newt Triturus alpestris. Location Europe. Methods Determination of the main characteristics of all known aquatic sites containing paedomorphic Alpine newt individuals. Results Although metamorphs are common in Europe, paedomorphs are only found at the southern margin of the geographical range of the species: mainly in Italy and in the Balkans. They were recorded in eighty-seven aquatic sites. No single trend was outlined for the analysed ecological parameters of the aquatic and terrestrial habitats (e.g. altitude, maximum water depth, drying and presence of forest). Main conclusions Contrary to the first models of paedomorphosis, the main traits of aquatic and terrestrial habitat do not explain the occurrence of paedomorphs in natural populations. Although they were found in favourable aquatic habitats surrounded by hostile terrestrial landscapes, they also exist in temporary waters located at proximity of appropriate terrestrial environments. These results support models predicting paedomorphosis in varied environments, but require complementary investigations on the costs and benefits of the alternative ontogenetic pathways. On the other hand, the southern limitation of the heterochronic phenomenon suggests a genetic basis for paedomorphosis in the studied species. [less ▲]

Detailed reference viewed: 222 (24 ULg)
Peer Reviewed
See detailEffet of dietary fat levels on growth, feed efficiency and biochemical compositions of Eurasian perch Perca fluviatilis
Xu; Fontaine, P.; Mélard, Charles ULg et al

in Aquaculture International (2001), 9

Detailed reference viewed: 15 (5 ULg)
Full Text
Peer Reviewed
See detailImage analysis, impedance spectroscopy and mercury porosimetry characterisation of freeze-drying porous materials
Blacher, Silvia ULg; Maquet, Véronique; Pirard, René ULg et al

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2001), 187-188

Image analysis and impedance spectroscopy have been used as potential tools for the characterization of the texture of ultramacroporous PLA foams prepared by freeze-drying. It has been shown that these ... [more ▼]

Image analysis and impedance spectroscopy have been used as potential tools for the characterization of the texture of ultramacroporous PLA foams prepared by freeze-drying. It has been shown that these two techniques actually provide valuable information on the structure of this material. They are complementary to mercury porosimetry, which does not allow morphological details to be distinguished. Image analysis of SEM micrographs of transverse cross-sections at two different magnifications gave information on both the macroporosity (1 μm < width < 10 μm) and ultramacroporosity (width > 10 μm). Impedance spectroscopy was used to investigate the transport properties of the three-dimensional porous matrices by measurement of ionic conduction [less ▲]

Detailed reference viewed: 61 (14 ULg)
Peer Reviewed
See detailPharmacology of the Thromboxane Receptor Antagonist and Thromboxane Synthase Inhibitor Bm-531
Dogné, J. M.; Rolin, S.; de Leval, X. et al

in Cardiovascular Drug Reviews (2001), 19(2, Summer), 87-96

BM-531 (N-tert-butyl-N'-[(2-cyclohexylamino-5-nitrobenzene)sulfonyl]urea), a torasemide derivative, is a novel noncarboxylic thromboxane receptor antagonist and thromboxane synthase inhibitor. Indeed, its ... [more ▼]

BM-531 (N-tert-butyl-N'-[(2-cyclohexylamino-5-nitrobenzene)sulfonyl]urea), a torasemide derivative, is a novel noncarboxylic thromboxane receptor antagonist and thromboxane synthase inhibitor. Indeed, its affinity for human washed platelet TXA2 receptors labeled with [3H]SQ-29548 (IC50 = 0.0078 microM) is higher than sulotroban (IC50 = 0.93 microM) and SQ-29548 (IC50 = 0.021 microM). Moreover, BM-531 is characterized by a potent antiaggregatory property. Indeed, on one hand, in human citrated platelet-rich plasma BM-531 prevents platelet aggregation induced by arachidonic acid (600 microM) (ED100 = 0.125 microM), U-46619, a stable TXA2 agonist (1 microM) (ED50 = 0.482 microM) or collagen (1 microgram/mL) (percentage of inhibition: 42.9% at 10 microM) and inhibits the second wave of ADP (2 microM)-induced aggregation. On the other hand, when BM-531 is incubated in whole blood from healthy donors, the closure time measured by the recently developed platelet function analyser (PFA-100) is significantly prolonged. In addition, at the concentrations of 10 and 1 microM, BM-531 totally prevents the production of TXB2 by human platelets activated by arachidonic acid. Finally, at 10 microM, BM-531 significantly prevents rat fundus contractions induced by U-46619 but not by prostacyclin. These results suggest that BM-531, which is devoid of the diuretic property of torasemide, can be regarded as a promising antiplatelet agent. [less ▲]

Detailed reference viewed: 16 (0 ULg)
Full Text
See detailLa protection et la gestion du patrimoine biologique
Dufrêne, Marc ULg

in Bulletin de la Commission royale des Monuments, Sites et Fouilles (2001), 17

Detailed reference viewed: 58 (16 ULg)
Full Text
Peer Reviewed
See detailEffet de l’environnement proche sur la biodiversité entomologique en culture maraîchères de plein champ
Colignon, P.; Haubruge, Eric ULg; Hastir, P. et al

in Parasitica (2001), 56

Detailed reference viewed: 272 (3 ULg)
Full Text
See detailProgramme international pour le suivi des acquis des élèves (PISA) de l'OCDE
Lafontaine, Dominique ULg; Baye, Ariane ULg; Matoul, Anne ULg

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2001), 7-8(7-8), 53-57

Detailed reference viewed: 57 (10 ULg)
Full Text
Peer Reviewed
See detailLes configurations de risques comme approche de la résilience dans une étude longitudinale
Boët, S.; Born, Michel ULg

in Revue Québécoise de Psychologie (2001), 22(1), 93-116

Cette recherche s'inscrit dans le cadre d'une étude longitudinale des facteurs de risque et de protection en délinquance juvénile. Nous avons observé les pratiques éducatives de la mère ainsi que le ... [more ▼]

Cette recherche s'inscrit dans le cadre d'une étude longitudinale des facteurs de risque et de protection en délinquance juvénile. Nous avons observé les pratiques éducatives de la mère ainsi que le comportement de l'enfant de sa naissance à cinq ans. Nous avons pu mettre en évidence quatre configurations de risque familial qui s'avèrent contenir nombre des enfants les plus turbulents de notre échantillon. Cependant, ces configurations rassemblent aussi des enfants qui ne manifestent aucun trouble comportemental, ce sont des enfants que nous considérons comme résilients. [less ▲]

Detailed reference viewed: 169 (25 ULg)
Full Text
Peer Reviewed
See detailThe Developments of Cold-rolled TRIP-assisted Multiphase Steels. Al-alloyed TRIP-assisted Multiphase Steels
Jacques, Pascal J.; Girault, Etienne; Mertens, Anne ULg et al

in ISIJ International (2001), 41(9), 1068-1074

The influence of heat-treating conditions on the retention of carbon-enriched austenite of TRIP-assisted multiphase steel grades containing different amounts of silicon and/or aluminium is investigated ... [more ▼]

The influence of heat-treating conditions on the retention of carbon-enriched austenite of TRIP-assisted multiphase steel grades containing different amounts of silicon and/or aluminium is investigated. The ensuing mechanical properties resulting from the TRIP effect are also scrutinised. The bainite transformation kinetics was followed by dilatometry whereas a detailed characterisation of the microstructures led to the construction off transformation maps giving the volume fractions of the different phases and the carbon content of the austenite. The role of silicon and aluminium additions (i)on the retention of austenite by partial bainite transformation and (ii) on the mechanical properties is enlightened. A strong influence of the solid-solution strengthening effect of silicon is highlighted. Aluminium seems to be an effective alloying element for the retention of austenite in TRIP-aided steels even if lower strength levels can be attained. A mixed Al-Si TRIP-aided steel seems to be a very good compromise between the processing needs, the required mechanical properties and the industrial constraints. [less ▲]

Detailed reference viewed: 76 (1 ULg)
Full Text
See detailMémoire à court terme et pathologies du langage
Poncelet, Martine ULg; Majerus, Steve ULg; Van der Linden, Martial ULg

in Rééducation Orthophonique (2001), 208

Detailed reference viewed: 82 (12 ULg)
Full Text
Peer Reviewed
See detailGrowth patterns of Belgian Blue replacement heifers and growing males in commercial farms
de Behr, Vanessa; Hornick, Jean-Luc ULg; Cabaraux, Jean-François ULg et al

in Livestock Production Science (2001), 71

A survey was carried out to propose models of growth curves in Belgian Blue cattle less than 20 months of age and raised in commercial farms in southern Belgium. Live weight data were recorded between ... [more ▼]

A survey was carried out to propose models of growth curves in Belgian Blue cattle less than 20 months of age and raised in commercial farms in southern Belgium. Live weight data were recorded between 1993 and 1999 from 1104 breeding heifers, and 924 growing males. The linear, polynomial group, power, logistic, Brody, Gompertz, von Bertalanffy and Richards models were used and compared. A step-wise linear growth model characterized by two periods of linear growth was also evaluated. This last model has been proposed as the reference model to characterize the growth curves of Belgian Blue cattle less than 20 months old. The animals were then ranked and divided in subgroups based on percentiles and quartiles in order to compare their performances. The subgroups performing better presented a greater homogeneity. The males ranked above the 90th percentile presented a growth rate comparable to that of young males selected for artificial insemination. Cattle ranked above the third quartile presented a growth rate comparable to that of licensed animals. When reproduction performances were related to the growth rate, it appeared that the better growing heifers were bred younger and heavier than lesser performing animals. [less ▲]

Detailed reference viewed: 97 (9 ULg)
Full Text
Peer Reviewed
See detailNeuregulin signaling regulates neural precursor growth and the generation of oligodendrocytes in vitro
Calaora, Viviane; Rogister, Bernard ULg; Bismuth, Karen et al

in Journal of Neuroscience (2001), 21

Detailed reference viewed: 11 (1 ULg)
Peer Reviewed
See detailGiacomo Leopardi e Francesco Guicciardini
Moreno, Paola ULg

in Studi e Problemi di Critica Testuale (2001), LXII

Detailed reference viewed: 188 (1 ULg)
See detailQuelle évaluation externe des élèves pour quels socles de compétences ?
Bodin, A.; Delory, C.; Lafontaine, Dominique ULg et al

in Pédagogies, réformes et innovations dans l'enseignement (2001), 14

Detailed reference viewed: 45 (10 ULg)
Peer Reviewed
See detailThe Syntrichia Ruralis Complex In Belgium
Vanderpoorten, Alain ULg

in Cryptogamie Bryologie (2001), 22(2),

Detailed reference viewed: 20 (0 ULg)