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See detailIntroduction générale aux techniques d'imagerie
Pirard, Eric ULg

in Techniques de l'Industrie Minérale (2001), 12

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See detailRheinische Wortgeographie - dialektometrische Kartenauswertung
Möller, Robert ULg

in Dialectologia et Geolinguistica (2001), 9

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See detailMagnetotransport properties of a single grain boundary in a bulk La-Ca-Mn-O material
Vertruyen, Bénédicte ULg; Cloots, Rudi ULg; Rulmont, André ULg et al

in Journal of Applied Physics (2001), 90(11), 5692-5697

Besides the "intrinsic" colossal magnetoresistance effect observed in single crystals, the polycrystalline manganate compounds also exhibit an "extrinsic" magnetoresistance related to the presence of ... [more ▼]

Besides the "intrinsic" colossal magnetoresistance effect observed in single crystals, the polycrystalline manganate compounds also exhibit an "extrinsic" magnetoresistance related to the presence of grain boundaries. We report electrical transport and magnetic measurements carried out on a bigrain sample extracted from a floating zone method-grown rod of calcium doped lanthanum manganate. Electrical resistance was measured both within a grain and across the grain boundary, between 20 and 300 K and from 0 to 8 T. Magnetoresistance values up to 99% are reached within the grain. The temperature dependence of the resistance across the grain boundary displays a "foot-like" feature towards the bottom of the transition. Low field and high field magnetoresistance effects are examined. We compare our results for a "bulk" grain boundary to those obtained by other authors for bicrystal thin films and bulk polycrystalline materials. (C) 2001 American Institute of Physics. [less ▲]

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See detailA thoughtful approach to brain tumours
Deprez, Manuel ULg

in Lancet (2001), Vol 358

Brain Tumours is a serious book, more than 1000 pages long, with 50 chapters, and the efforts of nearly 100 contributors. The editors begin by reminding us that surgery has always had a central role in ... [more ▼]

Brain Tumours is a serious book, more than 1000 pages long, with 50 chapters, and the efforts of nearly 100 contributors. The editors begin by reminding us that surgery has always had a central role in the management of brain tumours. However, surgical resection is often incomplete because of diffuse infiltration and the anatomical limits imposed by the surgical approach, or by proximity to the eloquent cortex. Incomplete resection undoubtedly contributes to tumour progression or recurrence, and the means to solve this dilemma lie in the collaborative effort of various medical and scientific disciplines. [less ▲]

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See detailCompact holographic camera based on photorefractive crystals and application in interferometry
Georges, Marc ULg; Scauflaire, Véronique; Lemaire, Philippe

in Optical Materials (2001), 18

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See detailExpression and function of the collagen receptor GPVI during megakaryocyte maturation.
Lagrue-Lak-Hal, A. H.; Debili, N.; Kingbury, G. et al

in Journal of Biological Chemistry (2001), 276(18), 15316-25

In this report, the expression and function of the platelet collagen receptor glycoprotein VI (GPVI) were studied in human megakaryocytes during differentiation and maturation of mobilized blood and cord ... [more ▼]

In this report, the expression and function of the platelet collagen receptor glycoprotein VI (GPVI) were studied in human megakaryocytes during differentiation and maturation of mobilized blood and cord blood derived CD34(+) cells. By flow cytometry, using an anti-GPVI monoclonal antibody or convulxin, a GPVI-specific ligand, GPVI was detected only on CD41(+) cells including some CD41(+)/CD34(+) cells, suggesting expression at a stage of differentiation similar to CD41. These results were confirmed at the mRNA level using reverse transcription-polymerase chain reaction. GPVI expression was low during megakaryocytic differentiation but increased in the more mature megakaryocytes (CD41(high)). As in platelets, megakaryocyte GPVI associates with the Fc receptor gamma chain (FcRgamma). The FcR gamma chain was detected at the RNA and protein level at all stages of megakaryocyte maturation preceding the expression of GPVI. The other collagen receptor, alpha(2)beta(1) integrin (CD49b/CD29), had a pattern of expression similar to GPVI. Megakaryocytic GPVI was recognized as a 55-kDa protein by immunoblotting and ligand blotting, and thus it presented a slightly lower apparent molecular mass than platelet GPVI (58 kDa). Megakaryocytes began to adhere to immobilized convulxin via GPVI after only 8-10 days of culture, at a time when megakaryocytes were maturing. At this stage of maturation, they also adhered to immobilized collagen by alpha(2)beta(1) integrin-dependent and -independent mechanisms. Convulxin induced a very similar pattern of protein tyrosine phosphorylation in megakaryocytes and platelets including Syk, FcRgamma, and PLC(gamma)2. Our results showed that GPVI is expressed early during megakaryocytic differentiation but functionally allows megakaryocyte adherence to collagen only at late stages of differentiation when its expression increases. [less ▲]

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See detailElement removal in harvested tree biomass: scenarios for critical loads in Wallonia, south Belgium
Bosman, Bernard ULg; Remacle, Jean; Carnol, Monique ULg

in Water, Air & Soil Pollution : Focus (2001), 1

The critical load concept is now widely used as a tool for developing emission control policies in Europe. As a signatory country of the Convention of Long-Range Transboundary Air Pollution, critical ... [more ▼]

The critical load concept is now widely used as a tool for developing emission control policies in Europe. As a signatory country of the Convention of Long-Range Transboundary Air Pollution, critical loads for acidity, nutrient nitrogen, nitrogen and sulphur have been calculated for the Flemish and Walloon regions in Belgium. This paper describes the methodology used for estimating critical loads for forest soils in the Walloon region according to the Steady-State Mass Balance equations. As an example the methodology was applied to the catchment `Waroneu', situated in a sensitive area of the Haute Ardenne. Main input parameters to the equations were derived from precipitation and runoff data of the catchment study. Improved estimates of nitrogen uptake (Nu) and base cation uptake (BCu) were obtained by intensive sampling of Picea abies and Quercus robur trees. Nutrient contents (Ca, Mg, K, N) and nutrient to nitrogen ratios of Picea abies reflected the poor soil quality at a site with high N deposition. Quercus robur nutrient contents increased from stem to higher order branches with a high proportion of nutrients located in the bark. However the simulation of stem only harvesting had a minor effect on critical loads. Measured wood densities were lower than reported literature values with a main effect on Nu and BCu estimates. The use of recommended default values and/or data derived from the experimental site resulted in a wide range of critical loads, some of which were largely overestimated. Results demonstrated the importance of site specific data for critical load calculations. [less ▲]

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See detailCharacterization of the human Fc gamma RIIB gene promoter: human zinc-finger proteins (ZNF140 and ZNF91) that bind to different regions function as transcription repressors
Nishimura, Tadahiro; Narita, Tadashi; Miyazaki, Emi et al

in International Immunology (2001), 13(8), 1075-84

Expression of the human low-affinity Fc receptors for IgG (human Fc gamma RII) is differentially regulated. We report here the characterization of the promoter structure of the human Fc gamma RIIB gene ... [more ▼]

Expression of the human low-affinity Fc receptors for IgG (human Fc gamma RII) is differentially regulated. We report here the characterization of the promoter structure of the human Fc gamma RIIB gene and the isolation of the promoter region-binding proteins by a yeast one-hybrid assay. The minimal 154-bp region upstream from the transcription start site of the human Fc gamma RIIB gene was shown to possess promoter activity in a variety of cells. An electrophoretic mobility shift assay indicated that multiple nuclear factors in cell extracts bind to the two regions [F2-3 (-110 to -93) and F4-3 (-47 to -31)] of the human Fc gamma RIIB gene promoter. Mutation analysis indicated that GGGAGGAGC (-105 to -97) and AATTTGTTTGCC (-47 to -36) sequences are responsible for binding to nuclear factors respectively. By using GGGAGGAGC and AATTTGTTTGCC as bait sequences, we cloned two zinc-finger proteins (ZNF140 and ZNF91) that bind to the F2-3 and F4-3 regions within the promoter of the human Fc gamma RIIB gene respectively. When the ZNF140 and ZNF91 were transfected with reporter plasmid, both showed repressor activity with additive effects. Thus, these results indicate that these cloned ZNF140 and ZNF91 proteins function as repressors for the human Fc gamma RIIB transcription. [less ▲]

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See detailThe Syntrichia Ruralis Complex In Belgium
Vanderpoorten, Alain ULg

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

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See detailLa crise argentine : faillite d’un système et crise géopolitique ?
Santander, Sébastian ULg

in Cahiers des Ameriques Latines (2001), 38/3

La crise qui cuvait depuis plus de trois ans en Argentine et qui a éclaté au grand jour en décembre 2001 a occasionné d'importantes conséquences pour la politique étrangère du pays et partant des ... [more ▼]

La crise qui cuvait depuis plus de trois ans en Argentine et qui a éclaté au grand jour en décembre 2001 a occasionné d'importantes conséquences pour la politique étrangère du pays et partant des mutations géopolitiques régionales. [less ▲]

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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

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See detailExperimental and theoretical lifetimes in Yb III
Zhang, Z. G.; Li, Z. S.; Svanberg, S. et al

in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (2001), 15

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See detailEvolution of aphidophagous ladybird populations in a vegetable crop and implications as biological agents.
Francis, Frédéric ULg; Colignon, P.; Hastir, P. et al

in Mededelingen van de Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen (Rijksuniversiteit te Gent) (2001), 66(2a), 333-40

Aphidophagous predators such as hoverfly and ladybird beetles are effective biological agents to control aphid pests in perennial and annual cultivated species. Introduction and conservation of beneficial ... [more ▼]

Aphidophagous predators such as hoverfly and ladybird beetles are effective biological agents to control aphid pests in perennial and annual cultivated species. Introduction and conservation of beneficial insects are two ways to increase natural control of pests. Whether massive releases of entomophagous insects are expensive and time consuming, the preservation of predator natural populations can be expected by reducing and by adapting chemical treatments in crop fields. Vegetable cultivated areas increased in Belgium for several years, mainly Fabaceae species such as peas and beans. In this work, the evolution of ladybird species population was assessed from May to June in broad bean fields (Vicia faba L.) between Waremme and Hannut, in Hesbaye. Weekly, the aphid and aphidophagous beetle populations were collected from yellow traps and determined on plants by visual observations. Even if five ladybird species were identified, three of them represented more than 95% of the collected insects (Coccinella septempunctata L., Propylea quatuor-decimpunctata L. and Psyllobora vingintiduopunctata L.). Evolution of coccinellid populations during the cultivation season was discussed in relation to the presence of potential aphid preys and the agrochemical treatments which were applied. Integrated pest management in vegetable fields constitute a reliable way to increase the quality level of fresh vegetables in terms of pesticide residue limitations. [less ▲]

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See detailThe ATP-gated P2X1 ion channel acts as a positive regulator of platelet responses to collagen.
Oury, Cécile ULg; Toth-Zsamboki, Emese; Thijs, Chantal et al

in Thrombosis and Haemostasis (2001)

This study shows that, during collagen-initiated platelet activation, the early secretion of ATP results in the activation of the P2X1 ion channel, which plays a role as a positive regulator of further ... [more ▼]

This study shows that, during collagen-initiated platelet activation, the early secretion of ATP results in the activation of the P2X1 ion channel, which plays a role as a positive regulator of further platelet responses. [less ▲]

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See detailComparison between the GIRBAS Scale and the Acoustic and Aerodynamic Measures Provided by EVA for the Assessment of Dysphonia following Unilateral Vocal Fold Paralysis.
Morsomme, Dominique ULg; Jamart, Jacques; Wery, Carine et al

in Folia Phoniatrica et Logopaedica (2001), 53(6), 317-25

The aim of this study is to establish relevant objective parameters for evaluating dysphonia following unilateral vocal fold paralysis. To do so, the study compares objective and perceptual voice measures ... [more ▼]

The aim of this study is to establish relevant objective parameters for evaluating dysphonia following unilateral vocal fold paralysis. To do so, the study compares objective and perceptual voice measures. The objective measures were obtained using a voice analysis software (Evaluation Vocale Assistee), whereas the perceptual measures were established with the GIRBAS Scale (grade, instability, roughness, breathiness, asthenia, and strain). All measurements were performed on 40 voice samples: 28 dysphonic subjects with unilateral laryngeal paralysis, and 12 control subjects. The intra- and inter-judge agreements were fairly good, at least for control subjects. The six GIRBAS measures obtained from the pathological voices were higher than those from the control voices (p < 0.001) and the correlation between both groups was good. Grade, breathiness and asthenia correlated with the objective parameters that express the aperiodicity of the phonatory signal (p < 0.01), namely, the coefficient of variability of the fundamental frequency, the coefficient of variability of intensity, and jitter. Our findings suggest that the perceptual reality of laryngeal paralysis-induced dysphonia depends more on grade, breathiness and asthenia than it does on roughness or instability. [less ▲]

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See detailLa Position de la littérature congolaise dans l’ensemble des littératures africaines : une approche du cheminement de la pensée congolaise
Vanhaegendoren, Koen ULg

in Revue luxembourgeoise de littérature générale et comparée (2001)

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See detailInfluence of electrical properties on the evaluation of the surface hydrophobicity of Bacillus subtilis
Ahimou, F.; Paquot, Michel ULg; Jacques, Philippe ULg et al

in Journal of Microbiological Methods (2001), 45(2), 119-126

The surface hydrophobicity of nine Bacillus subtilis strains in different states (spores, vegetative cells, and dead cells) was assessed by water contact angle measurements, hydrophobic interaction ... [more ▼]

The surface hydrophobicity of nine Bacillus subtilis strains in different states (spores, vegetative cells, and dead cells) was assessed by water contact angle measurements, hydrophobic interaction chromatography (HIC) and bacterial adhesion to hydrocarbon (BATH). Electrokinetic properties of B, subtilis strains were characterized by zeta potential measurements and found to differ appreciably according to the strain, Correlations between HIC data, BATH data and zeta potential showed that HIC and RATH are influenced by electrostatic interactions. Water contact angle measurements thus provide a better estimate of cell surface hydrophobicity. The water contact angle of B. subtilis varied according to the strain and the state, the spores tending to be more hydrophobic than vegetative cells. (C) 2001 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailTranslocation Of The pAntp Peptide And Its Amphipathic Analogue Ap-2al
Drin, G.; Demene, H.; Temsamani, J. et al

in Biochemistry (2001), 40(6), 1824-34

The pAntp peptide, corresponding to the third helix of the homeodomain of the Antennapedia protein, enters by a receptor-independent process into eukaryotic cells. The interaction between the pAntp ... [more ▼]

The pAntp peptide, corresponding to the third helix of the homeodomain of the Antennapedia protein, enters by a receptor-independent process into eukaryotic cells. The interaction between the pAntp peptide and the phospholipid matrix of the plasma membrane seems to be the first step involved in the translocation mechanism. However, the mechanism by which the peptide translocates through the cell membrane is still not well established. We have investigated the translocation ability of pAntp through a protein-free phospholipid membrane in comparison with a more amphipathic analogue. We show by fluorescence spectroscopy, circular dichroism, NMR spectroscopy, and molecular modeling that pAntp is not sufficiently helically amphipathic to cross a phospholipid membrane of a model system. Due to its primary sequence related to its DNA binding ability in the Antennapedia homeodomain-DNA complex, the pAntp peptide does not belong to the amphipathic alpha-helical peptide family whose members are able to translocate by pore formation. [less ▲]

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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 ▲]

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See detailLe Romuleon en françois, traduction de Sébastien Mamerot.
Moreno, Paola ULg

in Revue Belge de Philologie et d'Histoire (2001)

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See detailAutoimmune Pancreatitis Mimicking Cancer of the Head of Pancreas: Report of Two Cases
Servais, Anne-Marie ULg; Pestieau, Sophie R; Detry, Olivier ULg et al

in Acta Gastro-Enterologica Belgica (2001), 64(2, Apr-Jun), 227-30

Autoimmune pancreatitis has been characterised in 1995, but only a few cases have been published since then, most of them from Japan. This report describes the cases of two Belgian male patients who ... [more ▼]

Autoimmune pancreatitis has been characterised in 1995, but only a few cases have been published since then, most of them from Japan. This report describes the cases of two Belgian male patients who presented with isolated obstructive jaundice. Radiological imaging studies were highly suggestive of carcinoma of the head of pancreas and both patients underwent uneventful cephalic pancreaticoduodenectomy with portal vein resection. Pathological analysis of the removed tissues suggested an autoimmune process in both cases. Both patients had hyper-gammaglobulinemia and antinuclear antibodies, but failed to show evidence of any other autoimmune disease or cause of chronic pancreatitis. In both cases final diagnosis was autoimmune pancreatitis. Preoperative clinical suspicion of this diagnosis is mandatory and may avoid unnecessary surgery in future cases. [less ▲]

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See detailDifferences in glucosinolate degradation products related to aphid and Brassicaceae host plant myrosinases
Francis, Frédéric ULg; Wathelet, Jean-Paul ULg; Lognay, Georges ULg

in GCIRC Bulletin (2001)

Studies on chemical ecology of host plant selection by herbivores were largely carried out to orplain the diversity of secondary plant chemicals and host specialisation of herbivores. The glucosinolate ... [more ▼]

Studies on chemical ecology of host plant selection by herbivores were largely carried out to orplain the diversity of secondary plant chemicals and host specialisation of herbivores. The glucosinolate - isothiocyanate system in Brassicaceae plants was considered as a plant defence and was known to influence the feeding behaviour of phytophagous insects such as the cabbage aphid, Brevicoryre brassicae. Purified m5nosinases from the latter and from white mustard, Sinqis alba, were used to hydrolyse two glucosinolate compounds. Identification of the degradation products, mainly isothiocyanates, was perficrmed by gas chromatography - mass spectromeûy. While sinigdn hydrolysis gave identical isothiocyanates for insect and plant enzymes, B. brassicae myrosinase showed a particular activity toward sinalbin A lost of an hydrory group was obsen'red for the two latter substrates related products when compared to the S. alba enzymatic specificity. Aphid and plant myrosinases have different properties and specificities which can be discussed in relation to a co-evolution approach. [less ▲]

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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 ▲]

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See detailL’administration publique et les technologies de l’information
Cornet, Annie ULg; Rondeaux, Giseline ULg

in Gestion : Revue Internationale de Gestion (2001), 26(1), 28-30

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See detailQuasar pairs with arcminute angular separations
Zhdanov, V. I.; Surdej, Jean ULg

in Astronomy and Astrophysics (2001), 372

We use the Véron-Cetty & Véron (\cite {veron}) catalog (VV) of 13 213 quasars to investigate their possible physical grouping over angular scales 10arcsec <=Delta theta <= 1000arcsec . We first estimate ... [more ▼]

We use the Véron-Cetty & Véron (\cite {veron}) catalog (VV) of 13 213 quasars to investigate their possible physical grouping over angular scales 10arcsec <=Delta theta <= 1000arcsec . We first estimate the number of quasar pairs that would be expected in VV assuming a random distribution for the quasar positions and taking into account observational selection effects affecting heterogeneous catalogs. We find in VV a statistically significant (>3sigma ) excess of pairs of quasars with similar redshifts (Delta z<= 0.01) and angular separations in the 50arcsec -100arcsec range, corresponding to projected linear separations (0.2-0.5) Mpc/h[SUB]75[/SUB] (Omega[SUB]M[/SUB] =1, Omega[SUB]Lambda[/SUB] =0) or (0.4-0.7) Mpc/h[SUB]75[/SUB] (Omega[SUB]M[/SUB] =0.3, Omega[SUB]Lambda[/SUB] = 0.7). There is also some excess in the 100arcsec -600arcsec range corresponding to (1-5) Mpc in projected linear separations. If most of these quasar pairs do indeed belong to large physical entities, these separations must represent the inner scales of huge mass concentrations (cf. galaxy clusters or superclusters) at high redshifts; but it is not excluded that some of the pairs may actually consist of multiple quasar images produced by gravitational lensing. Of course, a fraction of these pairs could also arise due to random projections of quasars on the sky. The list of 11 pairs of quasars with redshift differences Delta z<= 0.02 and angular separations 50arcsec <= Delta theta <= 100arcsec is presented in order to stimulate further observational studies and to better understand the astrophysical and cosmological significance of these interesting objects. [less ▲]

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See detailAvancées récentes en biologie moléculaire du virus de la diarrhée virale bovine
Dehan, Pierre ULg; Hamers, C.; Couvreur, B. et al

in Annales de Médecine Vétérinaire (2001), 145

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See detailJuxtafacet Cyst of the Lumbar Spine. Clinical, Radiological and Therapeutic Aspects in 28 Cases
Salmon, B.; Martin, Didier ULg; Lenelle, Jacques ULg et al

in Acta Neurochirurgica (2001), 143(2), 129-34

OBJECT: A consecutive series of 28 "operated" juxtafacet cysts is reported. We emphasize the clinical and radiological aspects leading to diagnosis. We also discuss the results of the surgical treatment ... [more ▼]

OBJECT: A consecutive series of 28 "operated" juxtafacet cysts is reported. We emphasize the clinical and radiological aspects leading to diagnosis. We also discuss the results of the surgical treatment. MATERIAL AND METHODS: Medical information and radiological studies involving 28 patients were analyzed. Each patient has been operated on by decompressive laminectomy and resection of the cyst. The diagnosis was always confirmed by a pathological examination. The cyst most frequently occurred at the L4-L5 level (n = 18), and seldom at the L5-S1 (n - 6) or L3-L4 (n - 4) levels. RESULTS: The differential diagnosis from other pathological causes responsible for a radicular compression could not be done by physical examination. Spine X-rays or myelogram were nonspecific. Computed Tomography or CT-myelography could help in the diagnosis but MR imaging was the most sensitive. In our series, the respective sensitivities of these techniques are 56, 42 and 77%. The preoperative diagnosis was correct in 18 patients (64%). The cyst was sometimes adherent to the underlying dura, then significantly increasing the risk of dural tear and spinal fluid leak, especially when located at L3-L4 level. Surgical ablation lead to a complete recovery or an important improvement in 26 patients. CONCLUSIONS: The diagnosis of the juxtafacet cyst of the lumbar spine is better achieved by MRI. Surgery is the gold standard treatment, safe and long-term effective. When a total cyst removal with an internal facetectomy are performed, recurrence is exceptional. [less ▲]

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See detailCharge critique et longueur de flambement des éléments à inertie variable et aux conditions d'extrémité élastiques
Latteur, Pierre ULg

in revue scientifique des Instituts supérieurs industriels francophones de Belgique (2001), 15

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See detailAntimicrobial susceptilities of Campylobacter strains isolated from food animals in Belgium.
Van Looveren, M.; Daube, Georges ULg; De Zutter, L. et al

in Journal of Antimicrobial Chemotherapy (2001), 48

Afin d’assurer une transparence tout le long de la chaîne de transformation de la viande, il faut disposer d’un système de traçabilité performant. La traçabilité administative montre des limites que ... [more ▼]

Afin d’assurer une transparence tout le long de la chaîne de transformation de la viande, il faut disposer d’un système de traçabilité performant. La traçabilité administative montre des limites que l’utilisation de marqueurs génétiques pourrait surmonter. Le génome de chaque individu possède des différences de séquences, à la base du polymorphisme génétique, dont les marqueurs génétiques sont les témoins. Parmi ceux-ci, deux classes semblent s’imposer en matière de traçabilité : les microsatellites et les polymorphismes simple nucléotide. Les microsatellites sont caractérisés par un degré de polymorphisme important avec de nombreux allèles pour un même locus. De plus, leur détection se fait directement par amplification itérative. Techniquement, le problème se pose lors de la détection simultanée de plusieurs microsatellites où le patron obtenu est difficile à interpréter. Les polymorphismes simple nucléotide sont répresentés par des mutations ponctuelles dans la séquence nucléotidique. Ils sont fréquents, stables, répartis de façon aléatoire et généralement bialléliques. La détection se fait soit par hybridation sur des biopuces, soit par spectrométrie de masse ou par d’autres techniques facilement automatisables. Cette automatisation est nécessaire pour pouvoir tester un grand nombre de polymorphismes simultanément sur un grand nombre d’échantillons, permettant ainsi de diminuer les coûts. L’avantage majeur des polymophismes simple nucléotide est le signal binaire obtenu, son désavantage est le caractère population- spécifique de ce type de marqueur. [less ▲]

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See detailDiagnosis of psoroptic sheep scab with an improved enzyme-linked immunosorbent assay.
Ochs, H.; Lonneux, J.; Losson, Bertrand ULg et al

in Veterinary Parasitology (2001), 96(3), 233-42

An enzyme-linked immunosorbent assay (ELISA) was developed for the detection of specific antibodies against crude Psoroptes antigen. The diagnostic sensitivity was 93.7% in 191 sheep with clinical signs ... [more ▼]

An enzyme-linked immunosorbent assay (ELISA) was developed for the detection of specific antibodies against crude Psoroptes antigen. The diagnostic sensitivity was 93.7% in 191 sheep with clinical signs associated with mange. These animals originated from 29 flocks in which psoroptic mites were detected. All of 59 sheep infested with Psoroptes ovis were seropositive. Additionally, in 49% of 70 clinically unaffected sheep originating from P. ovis-infested flocks, specific antibodies could be detected, suggesting that asymptomatic infestations can be diagnosed by serology. The specificity of the ELISA was 96.5% as determined with 254 sheep originating from 44 flocks without clinical mange. Cross-reactivity in a low range was detected with selected sera of sheep with clinical chorioptic or forage mite infestations. Four sheep seroconverted 2 weeks after experimental P. ovis infestation, i.e. 2 weeks before clinical signs became obvious. After successful doramectin treatment of 14 sheep with naturally acquired P. ovis infestation, the ELISA values declined slowly but remained positive in seven cases beyond 17 weeks. [less ▲]

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See detailObligations des parties et sanctions des obligations dans la Convention de Vienne
Wautelet, Patrick ULg; van Houtte, Hans

in Revue du droit des affaires internationales - International Business Law Journal (2001)

This paper provides a detailed overview of the rights and duties of both seller and buyer under the Vienna Sales Convention. It does so in the light not only of the text of the Convention but also of the ... [more ▼]

This paper provides a detailed overview of the rights and duties of both seller and buyer under the Vienna Sales Convention. It does so in the light not only of the text of the Convention but also of the emerging case law of various countries, which is reviewed and taken into account. The overview also attempts to contrast the rules of the Convention with the rules applicable in Belgian contract law. [less ▲]

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See detailLe contrôle de la constitutionnalité des lois aux Pays-Bas
Kohl, Benoît ULg

in Chroniques de Droit Public = Publiekrechtelijke Kronieken (2001)

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See detailLe point sur la transplantation pancreatique.
De Roover, Arnaud ULg; Detry, Olivier ULg; Hamoir, Etienne ULg et al

in Revue Médicale de Liège (2001), 56(8), 557-62

Pancreas transplantation significantly improves the quality of life as well as the survival of the diabetic patient. It is also associated with stabilization and reversal of secondary diabetic ... [more ▼]

Pancreas transplantation significantly improves the quality of life as well as the survival of the diabetic patient. It is also associated with stabilization and reversal of secondary diabetic complications. Improvements in organ preservation, surgical techniques and immunosuppression have achieved one-year graft survival of more than 90% for combined kidney-pancreas transplant and 80% for isolated pancreas transplantation. Recipient evaluation must weigh the benefits of the procedure with the risk associated with surgery and chronic immunosuppression. Combined kidney-pancreas transplantation appears today as the best treatment for the diabetic patient with end stage renal disease. Isolated pancreas transplantation is reserved to non-uremic patients with severe diabetic complications or with brittle glycaemic control and severe impairment of quality of life. [less ▲]

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See detailLe défi de la diversité linguistique des apprenants pour l’apprentissage de la lecture et de l’écriture
Lucchini, Silvia ULg; Flamini, F.; Campolini, L.

in Langues Modernes (2001), (1), 34-41

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See detailRésumé C.E. n°89.185, du 31 juillet 2000, Van Den Borre
Delnoy, Michel ULg

in Aménagement - Environnement (2001), 1

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See detailEthnobotanical And Chemical Surveys Of An Edible Wild Legume: Uraria Picta (Jacq.) Dc.
Ambe, Guy-Alain; Lognay, Georges ULg; Wathelet, Bernard ULg et al

in Ecology of Food and Nutrition (2001), 40(5),

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See detailOil field subsidence phenomena
Charlier, Robert ULg; Schroeder, Christian ULg; Radu, Jean-Pol ULg et al

in Revue Française de Génie Civil (2001), 5(6), 857-866

Subsidence of an chalky oil field is described. The mechanical behaviour of the chalk partly saturated by oil and water is described and allows to model the compaction occurring within a simple reservoir ... [more ▼]

Subsidence of an chalky oil field is described. The mechanical behaviour of the chalk partly saturated by oil and water is described and allows to model the compaction occurring within a simple reservoir model during the depletion as well as during the water injection. [less ▲]

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See detailResonance-assisted tunneling in near-integrable systems
Brodier, O.; Schlagheck, Peter ULg; Ullmo, D.

in Physical Review Letters (2001), 87(6), 064101

Dynamical tunneling between symmetry related invariant tori is studied in the near-integrable regime. Using the kicked Harper model as an illustration, we show that the exponential decay of the wave ... [more ▼]

Dynamical tunneling between symmetry related invariant tori is studied in the near-integrable regime. Using the kicked Harper model as an illustration, we show that the exponential decay of the wave functions in the classically forbidden region is modified due to coupling processes that are mediated by classical resonances. This mechanism leads to a substantial deviation of the splitting between quasidegenerate eigenvalues from the purely exponential decrease with 1/(h) over bar obtained for the integrable system. A simple semiclassical framework, which takes into account the effect of the resonance substructure on the invariant tori, allows one to quantitatively reproduce the behavior of the eigenvalue splittings. [less ▲]

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See detailImproving the bias/variance tradeoff of decision trees - towards soft tree induction
Geurts, Pierre ULg; Olaru, Cristina; Wehenkel, Louis ULg

in Engineering intelligent systems (2001), 9

One of the main difficulties with standard top down induction of decision trees comes from the high variance of these methods. High variance means that, for a given problem and sample size, the resulting ... [more ▼]

One of the main difficulties with standard top down induction of decision trees comes from the high variance of these methods. High variance means that, for a given problem and sample size, the resulting tree is strongly dependent on the random nature of the particular sample used for training. Consequently, these algorithms tend to be suboptimal in terms of accuracy and interpretability. This paper analyses this problem in depth and proposes a new method, relying on threshold softening, able to significantly improve the bias/variance tradeoff of decision trees. The algorithm is validated on a number of benchmark problems and its relationship with fuzzy decision tree induction is discussed. This sheds some light on the success of fuzzy decision tree induction and improves our understanding of machine learning, in general. [less ▲]

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See detailSurvey of pigeonpea production systems, utilization and marketing in semi-arid lands of Kenya.
Mergeai, Guy ULg; Kimani, P.; Mwang'ombe, A. et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2001), 5(3), 145-153

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See detailGlutathione S-transferases of Aulacorthum solani and Acyrthosiphon pisum: partial purification and characterization.
Francis, Frédéric ULg; Haubruge, Eric ULg; Gaspar, Charles ULg et al

in Comparative Biochemistry & Physiology Part B (2001), 129(1), 165-71

Glutathione S-transferases (GST) play an important role in the detoxification of many substances including allelochemicals from plants. Brassicaceae plants contain glucosinolates and emit volatile ... [more ▼]

Glutathione S-transferases (GST) play an important role in the detoxification of many substances including allelochemicals from plants. Brassicaceae plants contain glucosinolates and emit volatile isothiocyanates which affect the GST system. A comparison of the GST of two aphid species, the generalist Aulacorthum solani found on Brassicaceae and the Fabaceae specialist Acyrthosiphon pisum, was made to try to explain their respective feeding behaviour. Differences of GST were determined among the two aphid species based on purification by affinity chromatography, SDS-PAGE and on kinetic studies. Purification yields using an epoxy-activated Sepharose 6B column were highly different for the two aphid species (18% and 34% for A. solani and A. pisum, respectively). These variations were confirmed by SDS-PAGE. While only a 27-kDa band was observed for A. pisum, two bands of approximately 25-kDa were visualized for the generalist aphid, A. solani. Considering the kinetic results, differences of Km and Vmax were observed following the aphid species when a range of substrates (CDNB and DCNB) and GSH concentrations were tested. Studies on the detoxification enzymes of generalist and specialist herbivores would be undertaken to determine accurately the effect of the host plant on the organisms eating them, particularly in terms of biochemical and ecological advantages. [less ▲]

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See detailRez. zu: Piirainen, Elisabeth: Phraseologie der westmünsterländischen Mundart
Möller, Robert ULg

in Zeitschrift für Dialektologie und Linguistik (2001), 69

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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 ▲]

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See detailLa photographie aérienne en période de sècheresse comme source de renseignements géologiques en Wallonie
Quoilin, H.; Ozer, André ULg; Cornet, Yves ULg et al

in Bulletin de la Société Géographique de Liège (2001), 40(2001-1), 33-40

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See detailPDX:PBX complexes are required for normal proliferation of pancreatic cells during development.
Dutta, S.; Gannon, M.; Peers, Bernard ULg et al

in Proceedings of the National Academy of Sciences of the United States of America (2001), 98(3), 1065-70

The homeobox factor PDX-1 is a key regulator of pancreatic morphogenesis and glucose homeostasis; targeted disruption of the PDX-1 gene leads to pancreatic agenesis in pdx-1(-/-) homozygotes. Pdx-1 ... [more ▼]

The homeobox factor PDX-1 is a key regulator of pancreatic morphogenesis and glucose homeostasis; targeted disruption of the PDX-1 gene leads to pancreatic agenesis in pdx-1(-/-) homozygotes. Pdx-1 heterozygotes develop normally, but they display glucose intolerance in adulthood. Like certain other homeobox proteins, PDX-1 contains a consensus FPWMK motif that promotes heterodimer formation with the ubiquitous homeodomain protein PBX. To evaluate the importance of PDX-1:PBX complexes in pancreatic morphogenesis and glucose homeostasis, we expressed either wild-type or PBX interaction defective PDX-1 transgenes under control of the PDX-1 promoter. Both wild-type and mutant PDX-1 transgenes corrected glucose intolerance in pdx-1 heterozygotes. The wild-type PDX-1 transgene rescued the development of all pancreatic lineages in pdx-1(-/-) animals, and these mice survived to adulthood. In contrast, pancreata from pdx-1(-/-) mice expressing the mutant PDX-1 transgene were hypoplastic, and these mice died within 3 weeks of birth from pancreatic insufficiency. All pancreatic cell types were observed in pdx-1(-/-) mice expressing the mutant PDX-1 transgene; but the islets were smaller, and increased numbers of islet hormone-positive cells were noted within the ductal epithelium. These results indicate that PDX-1:PBX complexes are dispensable for glucose homeostasis and for differentiation of stem cells into ductal, endocrine, and acinar lineages; but they are essential for expansion of these populations during development. [less ▲]

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See detailLes contrats de rivière en Wallonie (Belgique) : retour d'expériences
Rosillon, Françis ULg; Vander Borght, Paul ULg

in Revue européenne de droit de l'environnement (2001), (4), 414-429

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See detailAn equivalence test for comparing DNA sequences.
Thijs, H.; Van Steen, Kristel ULg; Molenberghs, G. et al

in American Journal of Human Genetics (2001), 69(4), 1576

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See detailEstimation of (co)variance functions for test-day yields during first and second lactations in the United States
Gengler, Nicolas ULg; Tijani, A.; Wiggans, G. R. et al

in Journal of Dairy Science (2001), 82

(Co)variance components for milk, fat, and protein yields during first and second lactations were estimated from test-day data from 23,029 Holstein cows from 37 herds in Pennsylvania and Wisconsin using a ... [more ▼]

(Co)variance components for milk, fat, and protein yields during first and second lactations were estimated from test-day data from 23,029 Holstein cows from 37 herds in Pennsylvania and Wisconsin using a multitrait test-day model. Canonical transformation was used with an expectation-maximization algorithm. To allow description of (co)variances within and across yield traits and parities, four lactation stages of 75 d were defined6 for each parity, and the test day nearest the center of each interval was used. Prior to analysis, data were adjusted for lactation curves within lactation stages using all records from all available cows. Data from cows with missing values were excluded to allow a canonical transformation to be used for estimation of (co)variance matrices. Data from 9110 cows were available for canonical analysis of lactations with test days in all lactation stages. (Co)variance functions were used to describe (co)variance structure within and across yield trait and parity. (Co)variance components of biological functions (305-d yield, persistency defined as difference between yields on d 280 and 60, and maturity rate defined as difference between second- and first-lactation yields) were developed from (co)variance functions. Heritabilities ranged from 0.09 to 0.22 for test-day yields, from 0.21 to 0.23 for 305-d yields, from 0.03 to 0.11 for persistencies, and from 0.05 to 0.07 for maturity rates. Phenotypic correlations between first- and second-lactation persistencies were low, but genetic correlations were high. Genetic correlations with maturity rate ranged from 0.11 to 0.61 for 305-d yields and persistencies. [less ▲]

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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 ▲]

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See detailEssais d’induction artificielle de la lactation chez des génisses âgées de 6 a 7 mois
Nchare, A.; Salaheddine, M.; Desbuleux, H. et al

in Annales de Médecine Vétérinaire (2001), 145(6, Suppl. S), 365-371

The rates of successful gene's manipulations are very low in domestic mammals. In addition the period between generations in cows is long. Artificial induction of lactation in young animals could improve ... [more ▼]

The rates of successful gene's manipulations are very low in domestic mammals. In addition the period between generations in cows is long. Artificial induction of lactation in young animals could improve manipulation yield for genes what are expressed in the udder, by anticipating the control of transgen expression in milk, a long time before the beginning of the milk production in normal condition. Using this method, the early selection of real transgenic animals would be possible. Between November 1999 and April 2000, lactation was induced in non-transgenic heifers aged from 6 to 7 months, in 2 trials based on short time hormonal treatment, with the goal of verifying the efficiency of the technique on immature heifers, and setting up a simple and reliable treatment scheme applicable on young animals. Interesting lactations (35 to 974 ml/day) were obtained, but the milk yield was low compared to adult performances. Results of the 2 trials were different, in relation with the galenical form of progesterone used and the frequency of drugs administration. So, these trials provide an efficient treatment scheme for induction of lactation in young heifers. [less ▲]

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See detailMicrotubule-associated protein 1B: a neuronal binding partner for myelin-associated glycoprotein.
Franzen, Rachelle ULg; Tanner, Sandy; Dashiell, Suzanne et al

in Journal of Cell Biology (2001), 155

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See detailDoes ovarian surgery for endometriomas impair the ovarian response to gonadotropin?
Donnez, Jacques; Wyns, Christine; NISOLLE, Michelle ULg

in Fertility and Sterility (2001), 76(4), 662-5

Objective: To evaluate the ovarian response to stimulation conducted for IVF treatment in women who have undergone conservative surgery for endometriomas. Design: Retrospective study with prospective ... [more ▼]

Objective: To evaluate the ovarian response to stimulation conducted for IVF treatment in women who have undergone conservative surgery for endometriomas. Design: Retrospective study with prospective selection of participants and controls. Setting: University infertility clinic. Patient(s): A series of 374 women who underwent in vitro fertilization (IVF). The study group consisted of 85 patients with ovarian endometriomas who had undergone laparoscopic surgery in an attempt to become pregnant, but had failed within a year of surgery. The control group consisted of 289 patients with tubal factor infertility. Intervention(s): IVF-embryo transfer procedures. Main Outcome Measure(s): Stimulation parameters, fertilization, implantation, and pregnancy rates were analyzed in both groups. Result(s): There was no significant difference between the two groups in stimulation parameters or IVF outcome. Conclusion(s): A total of 820 cycles were analyzed. A similar IVF-ET outcome was observed in patients with endometriosis after ablation of endometriomas compared to women with tubal factors. In conclusion, endometrioma surgery by internal wall vaporization does not impair IVF outcome. The clinical pregnancy rate was respectively 37.4% and 34.6% in the endometriosis group and the control group. [less ▲]

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See detailA control strategy for controllable series capacitor in electric power systems
Ghandhari, Mehrdad; Andersson, Goran; Pavella, Mania ULg et al

in Automatica (2001), 37

It has been veri"ed that a controllable series capacitor with a suitable control scheme can improve transient stability and help to damp electromechanical oscillations. A question of great importance is ... [more ▼]

It has been veri"ed that a controllable series capacitor with a suitable control scheme can improve transient stability and help to damp electromechanical oscillations. A question of great importance is the selection of the input signals and a control strategy for this device in order to damp power oscillations in an e!ective and robust manner. Based on Lyapunov theory a control strategy for damping of electromechanical power oscillations in a multi-machine power system is derived. Lyapunov theory deals with dynamical systems without inputs. For this reason, it has traditionally been applied only to closed-loop control systems, that is, systems for which the input has been eliminated through the substitution of a predetermined feedback control. However, in this paper, we use Lyapunov function candidates in feedback design itself by making the Lyapunov derivative negative when choosing the control. This control strategy is called control Lyapunov function for systems with control inputs. Also, two input signals for this control strategy are used. The "rst one is based on local information and the second one on remote information derived by the single machine equivalent method. [less ▲]

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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 ▲]

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See detailPlante-t-on l'épicéa n'importe où ? L'apport d'une analyse objective de la pessière wallonne.
Claessens, Hugues ULg; Lecomte, Hugues; Lejeune, Philippe ULg et al

in Forêt Wallonne (2001), (49-50), 45-51

Depuis son introduction dans la sylviculture belge au milieu du XIXe siècle, l'épicéa s'est progressivement imposé principalement grâce à sa bonne adaptation aux difficiles conditions écologiques de l ... [more ▼]

Depuis son introduction dans la sylviculture belge au milieu du XIXe siècle, l'épicéa s'est progressivement imposé principalement grâce à sa bonne adaptation aux difficiles conditions écologiques de l'Ardenne, la facilité de sa culture et sa haute productivité en sols pauvres. Il est devenu la première essence de la forêt wallonne où il représente près de la moitié du volume de bois sur pied. Mais petit à petit, l'impact négatif de sa culture à grande échelle sur l'environnement s'est aussi révélé, notamment lors de son introduction dans des milieux fragiles qu'il a altérés, voire détruits. Ces erreurs ont progressivement amené de plus en plus d'observateurs de notre patrimoine naturel à rejeter globalement l'épicéa et sa culture en Belgique. Ces cas malheureux sur lesquels se sont focalisées l'opinion publique et scientifique sont-ils l'exeption ? Dans quelle mesure l'épicéa a-t-il colonisé à tort certains milieux ? Dans quelles conditions sa culture est-elle acceptable, tolérée ou à exclure ? C'est à ce type de question que la présente étude tente de répondre. [less ▲]

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See detailEuthanasia: a law in Belgium?
Damas, François ULg; Damas, Pierre ULg; Lamy, Maurice ULg

in Intensive Care Medicine (2001), 27(10), 1683

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See detailUn exemple de gestion originale de la nature : la restauration de forêts alluviales de l’Elbe
Claessens, Hugues ULg

in Parcs & Réserves (2001), 56(1), 23-25

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See detailLes troubles des fonctions exécutives dans la maladie d'Alzheimer
Collette, Fabienne ULg; Van der Linden, Martial ULg

in Alzheimer Actualités (2001), (155), 6-9

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See detailFrontières d’efficacité et processus d’appariement sur le marché du travail au Maroc
Ibourk, Aomar; Perelman, Sergio ULg

in Economie et Prévision (2001), (150-151), 33-45

La capacité d’un marché du travail à générer de nouveaux emplois à partir d’un stock donné de postes vacants et de chômeurs est interprétée comme une forme d’efficacité transactionnelle. Elle peut être ... [more ▼]

La capacité d’un marché du travail à générer de nouveaux emplois à partir d’un stock donné de postes vacants et de chômeurs est interprétée comme une forme d’efficacité transactionnelle. Elle peut être mesurée à partir de l’estimation d’une fonction d’appariement qui décrit la situation d’échange entre la demande, exprimée par les firmes, et l’offre, représentée par les travailleurs à la recherche d’un emploi. Dans cet article, nous proposons l’utilisation des techniques des frontières d’efficacité pour ces estimations. Deux méthodes alternatives, paramétrique et non paramétrique, sont appliquées au cas des marchés du travail régionaux au Maroc. Les résultats obtenus permettent une évaluation de l’efficacité des appariements sur chacun des marchés ainsi qu’une évaluation de l’activité des centres d’information et d’orientation pour l’emploi (CIOPE) qui ont été créés au début des années quatre-vingt-dix aux fins de faciliter l’appariement de l’offre et de la demande des diplômés. [less ▲]

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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 ▲]

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See detailMigraine
Sandor, Peter S.; Agosti, Reto; Schoenen, Jean ULg

in Pain Clinical Updates (2001), 9

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See detailCaractérisation de particules d'engrais : corrélation entre les propriétés physiques et morphométriques
Miserque, Olivier; Tissot, Serge; Pirard, Eric ULg

in Récents Progrès en Génie des Procédés (2001), 15(78),

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See detailLocalized iterative generalized multipole technique for large two-dimensional scattering problems
Obelleiro, Fernando; Landesa, Luis; Rodriguez, Jose Luis et al

in Ieee Transactions On Antennas And Propagation (2001), 49(6), 961-970

In this work, we propose a novel and efficient solution for the generalized multipole technique (GMT): the localized iterative generalized multipole technique (LIGMT). In LIGMT, an analytic constraint is ... [more ▼]

In this work, we propose a novel and efficient solution for the generalized multipole technique (GMT): the localized iterative generalized multipole technique (LIGMT). In LIGMT, an analytic constraint is imposed on the power radiated by the set of multipole sources sharing the same origin, rendering it minimum over a given angular sector. In this way, the power radiated by each set of multipoles is confined to a different section of the scatterer surface. It follows that each set of multipole coefficients can be solved step by step via an iterative process, which circumvents the need to solve the large and full matrix equation. This implies a significant reduction of the computational and storage cost, enhancing the scope of application of the GMT method to larger problems. [less ▲]

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See detailPresentation of a French version ot the Internal, Personal and Situational Attributions Questionnaire
Laroi, Frank ULg; Brédart, Serge ULg

in European Review of Applied Psychology = Revue Européenne de Psychologie Appliquée (2001), 52

In recent years an increasing interest in attributional style in both normal and pathological populations has developed. In that context, the Internal, Personal and Situational Attributions Questionnaire ... [more ▼]

In recent years an increasing interest in attributional style in both normal and pathological populations has developed. In that context, the Internal, Personal and Situational Attributions Questionnaire (IPSAQ) was constructed. We investigated the psychometric properties of a French translation of the IPSAQ in a normal population.The results offer evidence that the present french translation has similarly adequate psychometric porperties as the original english version [less ▲]

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See detailLe sort des obligations du bailleur en cas de contre-préavis du locataire. Note sous Cass., 22 juin 1998
Kohl, Benoît ULg

in Journal des Juges de Paix = Tijdschrift van de Vrederecters (2001)

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See detailModule checking
Kupferman, Orna; Vardi, Moshe Y; Wolper, Pierre ULg

in Information & Computation (2001), 164(2), 322-344

In computer system design, we distinguish between closed and open systems. A closed system is a system whose behavior is completely determined by the state of the system. An open system is a system that ... [more ▼]

In computer system design, we distinguish between closed and open systems. A closed system is a system whose behavior is completely determined by the state of the system. An open system is a system that interacts with its environment and whose behavior depends on this interaction. The ability of temporal logics to describe an ongoing interaction of a reactive program with its environment makes them particularly appropriate for the specification of open systems. Nevertheless, model-checking algorithms used for the verification of closed systems are not appropriate for the verification of open systems. Correct model checking of open systems should check the system with respect to arbitrary environments and should take into account uncertainty regarding the environment. This is not the case with current model-checking algorithms and tools. In this paper we introduce and examine the problem of model checking of open systems (module checking, for short). We show that while module checking and model checking coincide for the linear-time paradigm, module checking is much harder than model checking for the branching-time paradigm. We prove that the problem of module checking is EXPTIME-complete for specifications in CTL and 2EXPTIME-complete for specifications in CTL*. This bad news is also carried over when we consider the program-complexity of module checking. As good news, we show that for the commonly-used fragment of CTL (universal, possibly, and always possibly properties), current model-checking tools do work correctly, or can be easily adjusted to work correctly, with respect to both closed and open systems. (C) 2001 Academic Press. [less ▲]

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See detailEffect of parathyroid hormone (1-34) on fractures and bone mineral density in postmenopausal women with osteoporosis.
Neer, R M; Arnaud, C D; Zanchetta, J R et al

in New England Journal of Medicine [=NEJM] (2001), 344(19), 1434-41

BACKGROUND: Once-daily injections of parathyroid hormone or its amino-terminal fragments increase bone formation and bone mass without causing hypercalcemia, but their effects on fractures are unknown ... [more ▼]

BACKGROUND: Once-daily injections of parathyroid hormone or its amino-terminal fragments increase bone formation and bone mass without causing hypercalcemia, but their effects on fractures are unknown. METHODS: We randomly assigned 1637 postmenopausal women with prior vertebral fractures to receive 20 or 40 microg of parathyroid hormone (1-34) or placebo, administered subcutaneously by the women daily. We obtained vertebral radiographs at base line and at the end of the study (median duration of observation, 21 months) and performed serial measurements of bone mass by dual-energy x-ray absorptiometry. RESULTS: New vertebral fractures occurred in 14 percent of the women in the placebo group and in 5 percent and 4 percent, respectively, of the women in the 20-microg and 40-microg parathyroid hormone groups; the respective relative risks of fracture in the 20-microg and 40-microg groups, as compared with the placebo group, were 0.35 and 0.31 (95 percent confidence intervals, 0.22 to 0.55 and 0.19 to 0.50). New nonvertebral fragility fractures occurred in 6 percent of the women in the placebo group and in 3 percent of those in each parathyroid hormone group (relative risk, 0.47 and 0.46, respectively [95 percent confidence intervals, 0.25 to 0.88 and 0.25 to 0.861). As compared with placebo, the 20-microg and 40-microg doses of parathyroid hormone increased bone mineral density by 9 and 13 more percentage points in the lumbar spine and by 3 and 6 more percentage points in the femoral neck; the 40-microg dose decreased bone mineral density at the shaft of the radius by 2 more percentage points. Both doses increased total-body bone mineral by 2 to 4 more percentage points than did placebo. Parathyroid hormone had only minor side effects (occasional nausea and headache). CONCLUSIONS: Treatment of postmenopausal osteoporosis with parathyroid hormone (1-34) decreases the risk of vertebral and nonvertebral fractures; increases vertebral, femoral, and total-body bone mineral density; and is well tolerated. The 40-microg dose increased bone mineral density more than the 20-microg dose but had similar effects on the risk of fracture and was more likely to have side effects. [less ▲]

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See detailSynergism between vascular endothelial growth factor and placental growth factor contributes to angiogenesis and plasma extravasation in pathological conditions
Carmeliet, Peter; Moons, Lieve; Luttun, Aernout et al

in Nature Medicine (2001), 7(5), 575-583

Vascular endothelial growth factor (VEGF) stimulates angiogenesis by activating VEGF receptor-2 (VEGFR-2). The role of its homolog, placental growth factor (PlGF), remains unknown. Both VEGF and PlGF bind ... [more ▼]

Vascular endothelial growth factor (VEGF) stimulates angiogenesis by activating VEGF receptor-2 (VEGFR-2). The role of its homolog, placental growth factor (PlGF), remains unknown. Both VEGF and PlGF bind to VEGF receptor-1 (VEGFR-1), but it is unknown whether VEGFR-1, which exists as a soluble or a membrane-bound type, is an inert decoy or a signaling receptor for PlGF during angiogenesis. Here, we report that embryonic angiogenesis in mice was not affected by deficiency of PlGF (Pgf -/-). VEGF-B, another ligand of VEGFR-1, did not rescue development in Pgf -/- mice. However, loss of PlGF impaired angiogenesis, plasma extravasation and collateral growth during ischemia, inflammation, wound healing and cancer. Transplantation of wild-type bone marrow rescued the impaired angiogenesis and collateral growth in Pgf -/- mice, indicating that PlGF might have contributed to vessel growth in the adult by mobilizing bone-marrow−derived cells. The synergism between PlGF and VEGF was specific, as PlGF deficiency impaired the response to VEGF, but not to bFGF or histamine. VEGFR-1 was activated by PlGF, given that anti-VEGFR-1 antibodies and a Src-kinase inhibitor blocked the endothelial response to PlGF or VEGF/PlGF. By upregulating PlGF and the signaling subtype of VEGFR-1, endothelial cells amplify their responsiveness to VEGF during the 'angiogenic switch' in many pathological disorders. [less ▲]

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See detailProperties of ordinary and exotic hadrons
Stancu, Floarea ULg

in Few-Body Systems Supplementum (2001), 13

I discuss properties of ordinary and exotic hadrons as described by two distinct constituent quark models. These are the one gluon exchange (OGE) and the Goldstone boson exchange (GBE) models. I also ... [more ▼]

I discuss properties of ordinary and exotic hadrons as described by two distinct constituent quark models. These are the one gluon exchange (OGE) and the Goldstone boson exchange (GBE) models. I also discuss the interaction between hadrons starting from their quark structure. The case of the $NN$ is presented in some details. [less ▲]

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See detailEffets benefiques de l'activite physique sur les facteurs de risque cardio-vasculaire.
Scheen, André ULg; Paquot, Nicolas ULg

in Revue Médicale de Liège (2001), 56(4), 239-43

Numerous observational (epidemiological surveys) or interventional (controlled trials) studies demonstrated that regular physical activity increases insulin sensitivity in normal subjects and decreases ... [more ▼]

Numerous observational (epidemiological surveys) or interventional (controlled trials) studies demonstrated that regular physical activity increases insulin sensitivity in normal subjects and decreases insulin resistance in patients with obesity and/or type 2 diabetes. These favourable effects are at least partially linked to a reduction in abdominal fat mass. This results in a significant improvement of lipid profile, with a decrease in the concentrations of total cholesterol, LDL cholesterol and triglycerides, associated with an increase of HDL cholesterol level. Such favourable metabolic effects related to regular physical activity probably explain the better cardiovascular prognosis observed in regularly exercising subjects as compared to sedentary individuals. These observations should motivate any practitioner to promote endurance physical exercise in every subject, especially in individuals at high cardiovascular risk. [less ▲]

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See detailThe effect of food on growth and metamorphosis of paedomorphs in Triturus alpestris apuanus
Denoël, Mathieu ULg; Poncin, Pascal ULg

in Archiv für Hydrobiologie (2001), 152(4), 661-670

The effect of food level on growth and metamorphosis of paedomorphs was examined in an experimental replicated design in Triturus alpestris apuanus. Paedomorphosis concerns the retention of larval ... [more ▼]

The effect of food level on growth and metamorphosis of paedomorphs was examined in an experimental replicated design in Triturus alpestris apuanus. Paedomorphosis concerns the retention of larval characteristics in adult individuals. Newts that forgo metamorphosis and then retain gill and gill slits in the adult stage maintain an aquatic life but keep potential for undergoing metamorphosis. Paedomorphs metamorphosed later in treatments with food as a non-limiting factor than in stressful treatments where food was limited. Timing of metamorphosis did not differ between males and females. Food level greatly affected growth rates. These results confirm and extend optimality models that predict paedomorphosis under advantageous aquatic conditions (paedomorph advantage hypothesis) and metamorphosis in stressful aquatic habitats. [less ▲]

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See detailInhibition of protein phosphatase PP1 in GH3B6, but not in GH3 cells, activates the MEK/ERK/c-fos pathway and the human prolactin promoter, involving the coactivator CPB/p300
Manfroid, Isabelle ULg; Martial, Joseph ULg; Muller, Marc ULg

in Molecular Endocrinology (Baltimore, Md.) (2001), 15(4), 625-37

The human (hPRL) PRL gene proximal promoter (-164/+15) is the target for numerous signal transduction pathways involving protein kinases. The inhibitor of Ser/Thr-protein phosphatases okadaic acid (OA ... [more ▼]

The human (hPRL) PRL gene proximal promoter (-164/+15) is the target for numerous signal transduction pathways involving protein kinases. The inhibitor of Ser/Thr-protein phosphatases okadaic acid (OA) was shown to induce this promoter in rat pituitary GH3B6 through a synergism between increased amounts of the ubiquitous factor AP-1 and the pituitary-specific factor Pit-1. Here we show that this activation results mainly from transcriptional stimulation of the c-fos promoter leading to increased AP-1 activity. We report the surprising absence of the hPRL and c-fos promoter stimulation by OA in GH3 cells, closely related to GH3B6 cells, and we use this discrepancy to dissect the precise mechanism of action. c-fos gene activation involves the mitogen-activated kinase (MAPK)-ternary complex factor (TCF) pathway and can be obtained by expressing active V12ras in both cell lines. We show that OA acts by inhibiting protein phosphatase PP1, thereby protecting MAPK kinase (MEK)1/2 and/or a MEK1/2-kinase from dephosphorylation. PP1 inhibition of MEK activation by V12ras does not occur in GH3 cells, indicating that a distinct, PP1-sensitive phosphorylation site is used in GH3B6 cells to activate the TCF pathway in GH3B6 cells. Finally, we show that the synergistic OA activation of the hPRL promoter by Pit-1 and AP-1 is independent of the Pit-1 transactivation domain and is mediated by the general coactivator (CRE-binding protein)-binding protein (CBP)/p300. [less ▲]

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See detailAuto-observation des modalites d'apprentissage en situation de projet. Metacognition mathetique au cours de PARMs; L'universite, un espace d'innovation pedagogique ?
Leclercq, Dieudonné ULg; Denis, Brigitte ULg

in Revue des Sciences de l'Education (2001), 27(2), 421-440

This article presents the training objectives (motivational, metacognitive, instrumental, and disciplinary) of a pedagogical method known as PARMs (multimedia reciprocal animation project) and procedures ... [more ▼]

This article presents the training objectives (motivational, metacognitive, instrumental, and disciplinary) of a pedagogical method known as PARMs (multimedia reciprocal animation project) and procedures for self-observation of learning as experienced by university students. The authors describe a series of didactic-mathetic activities related to training objectives, as well as those learning strategies promoted in the PARMs course. Two instruments to measure metacognitive thinking are presented: « Questionnaire on progress » and « Questionnaire on mathetical self-description ». The results of these questionnaires is then discussed. [less ▲]

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See detailThe Composite Genome Of The Legume Symbiont Sinorhizobium Meliloti
Galibert, Francis; Finan, Turlough M.; Long, Sharon R. et al

in Science (2001), 293(5530),

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See detailEvaluer une réforme pédagogique : La généralisation de l'apprentissage d'une langue seconde à l'école primaire
Blondin, Christiane ULg; Straeten, Marie-Hélène

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2001), (7-8), 163-173

La recherche Généralisation de l'apprentissage d'une langue moderne à l'école primaire, réalisée avec le soutien du Ministère de la Communauté française vise à évaluer la mise en place de l'innovation que ... [more ▼]

La recherche Généralisation de l'apprentissage d'une langue moderne à l'école primaire, réalisée avec le soutien du Ministère de la Communauté française vise à évaluer la mise en place de l'innovation que constitue l'enseignement obligatoire des langues en cinquième et sixième années primaires, dans les écoles fondamentales organisées ou subventionnées par la Communauté française.Il est donc nécessaire de récolter un maximum d'informations quant aux ressources des équipes éducatives et plus particulièrement des maîtres de langue face à cette réforme, quant aux difficultés rencontrées, aux aides et aux soutiens possibles, tant d'un point de vue méthodologique qu'institutionnel ou administratif. A terme, cette recherche veut proposer des pistes pour assurer la réussite de l'innovation. Le présent article situe cette recherche dans une perspective de pilotage d'innovation. [less ▲]

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See detailA finite element formulation for spectral problems in optical fibers
Guenneau, S.; Nicolet, A.; Zolla, F. et al

in COMPEL (2001), 20(1), 120--131

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See detailOral vitamin C attenuates acute ischaemia-reperfusion injury in skeletal muscle.
Kearns, S. R.; Moneley, D.; Murray, P. et al

in Journal of Bone & Joint Surgery, British Volume (2001), 83(8), 1202-6

Ischaemia-reperfusion injury (IRI) is caused by endothelial and subendothelial damage by neutrophil-derived oxidants. Vitamin C is an antioxidant which attenuates endothelial injury after IRI. Our aim was ... [more ▼]

Ischaemia-reperfusion injury (IRI) is caused by endothelial and subendothelial damage by neutrophil-derived oxidants. Vitamin C is an antioxidant which attenuates endothelial injury after IRI. Our aim was to evaluate the effect of oral vitamin C in the prevention of IRI in skeletal muscle. We used a model of cross-clamping (3 hours) and reperfusion (1 hour) of the cremaster muscle in rats. Muscle function was assessed electrophysiologically by electrical field stimulation. Infiltration by neutrophils was determined by the activity of tissue myeloperoxidase (MPO) and tissue oedema by the wet-to-dry ratio. Neutrophil respiratory burst activity was measured in control animals and groups pretreated with vitamin C. IRI significantly decreased muscle function and increased muscle neutrophil MPO activity and muscle oedema. Pretreatment with vitamin C preserved muscle function and reduced tissue oedema and neutrophil infiltration. Neutrophil respiratory burst activity was reduced in the group treated with vitamin C compared with the control group. We conclude that pretreatment with oral vitamin C protects against acute muscle IRI, possibly by attenuating neutrophil respiratory burst activity. [less ▲]

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See detailLarge pion pole in Z(S)(MOM)/(Z(P)(MOM) from Wilson action data
Cudell, Jean-René ULg; Le Yaouanc, A.; Pittori, C.

in Physics Letters B (2001), 516(1-2), 92-102

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See detailUne enquête internationale sur l'éducation à la citoyenneté : Connaissances, représentations, attitudes et engagement des jeunes
Lafontaine, Annette ULg; Hindryckx, Geneviève ULg

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2001), (7-8), 59-64

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See detailCompte rendu de M.D. Grmek, D. Gourevitch, Les maladies dans l'art antique, Paris, 1998 (Penser la médecine)
Marganne, Marie-Hélène ULg

in Antiquité Classique : Revue Interuniversitaire d'Etudes Classiques (2001), 70

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See detailStudies in Bacidia sensu lato (lichenized Ascomycetes: Lecanorales). II. Six new combinations in Fellhanera Vezda
Lücking, Robert; Cáceres, M.E.S.; Kalb, Klaus et al

in Lichenologist (2001), 33

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See detailAlgebraic decay of the survival probability in chaotic helium
Schlagheck, Peter ULg; Buchleitner, A.

in Physical Review. A (2001), 63(2), 024701

We demonstrate that the classical helium atom exhibits algebraic decay of the survival probability in the autoionizing eZe configuration. Excitation towards asymptotic orbits of marginal stability is ... [more ▼]

We demonstrate that the classical helium atom exhibits algebraic decay of the survival probability in the autoionizing eZe configuration. Excitation towards asymptotic orbits of marginal stability is identified as the cause of the nonexponential decay. Since one electron travels along a bound Kepler trajectory of infinite excitation in these orbits, we argue that the classical decay law will prevail in the quantum dynamics of a wave packet launched along the eZe configuration. [less ▲]

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See detailStrontium ranelate increases cartilage matrix formation.
Henrotin, Yves ULg; Labasse, Alain; Zheng, S. X. et al

in Journal of Bone and Mineral Research (2001), 16(2), 299-308

Based on previous studies showing that strontium ranelate (S12911) modulates bone loss in osteoporosis, it could be hypothesized that this drug also is effective on cartilage degradation in osteoarthritis ... [more ▼]

Based on previous studies showing that strontium ranelate (S12911) modulates bone loss in osteoporosis, it could be hypothesized that this drug also is effective on cartilage degradation in osteoarthritis (OA). This was investigated in vitro on normal and OA human chondrocytes treated or not treated with interleukin-1beta (IL-1beta). This model mimics, in vitro, the imbalance between chondroformation and chondroresorption processes observed in vivo in OA cartilage. Chondrocytes were isolated from cartilage by enzymatic digestion and cultured for 24-72 h with 10(-4)-10(-3) M strontium ranelate, 10(-3) M calcium ranelate, or 2 x 10(-3) M SrCl2 with or without IL-1beta or insulin-like growth factor I (IGF-I). Stromelysin activity and stromelysin quantitation were assayed by spectrofluorometry and enzyme amplified sensitivity immunoassay (EASIA), respectively. Proteoglycans (PG) were quantified using a radioimmunoassay. Newly synthesized glycosaminoglycans (GAGs) were quantified by labeled sulfate (Na2(35)SO4) incorporation. This method allowed the PG size after exclusion chromatography to be determined. Strontium ranelate, calcium ranelate, and SrCl2 did not modify stromelysin synthesis even in the presence of IL-1beta. Calcium ranelate induced stromelysin activation whereas strontium compounds were ineffective. Strontium ranelate and SrCl2 both strongly stimulated PG production suggesting an ionic effect of strontium independent of the organic moiety. Moreover, 10(-3) M strontium ranelate increased the stimulatory effect of IGF-I (10(-9) M) on PG synthesis but did not reverse the inhibitory effect of IL-1beta. Strontium ranelate strongly stimulates human cartilage matrix formation in vitro by a direct ionic effect without stimulating the chondroresorption processes. This finding provides a preclinical basis for in vivo testing of strontium ranelate in OA. [less ▲]

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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),

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See detailImmediate and long-term clinical and angiographic results from Wiktor stent treatment for true bifurcation narrowings.
Anzuini, A.; Briguori, C.; Rosanio, S. et al

in American Journal of Cardiology (2001), 88(11), 1246-50

From January 1996 to December 1998, 90 consecutive patients with true bifurcation lesions underwent percutaneous coronary angioplasty with Wiktor stent implantation in our centers. In 1 group (group I, n ... [more ▼]

From January 1996 to December 1998, 90 consecutive patients with true bifurcation lesions underwent percutaneous coronary angioplasty with Wiktor stent implantation in our centers. In 1 group (group I, n = 45), a simple approach (main vessel stenting and balloon angioplasty of the side branch) was pursued. In the other group (group II, n = 45), both the main vessel and the side branch were stented ("T" technique). There was no significant difference in clinical and angiographic characteristics between the 2 groups. Angiographic and procedural successes were 100% and 95.6%, respectively, in both groups. Angiographic results for the side branch were better in group II than in group I. In-hospital and long-term (12 month) major cardiac events were similar in the 2 groups. Target lesion revascularization was 15.5% in group I and 35.5% in group II (p = 0.12). In the main vessel, restenosis rate was 12.5% in group I and 25% in group II (p = 0.15). In the side branch, restenosis rate was 37.5% in group II and 12.5% in group I (p = <0.05; odds ratio 2.42; 95% confidence interval 1.05 to 6.26). Event-free probability at 12 months was 61% in group II and 80% in group I (p = 0.10). When dealing with true bifurcation lesions, a simple strategy is associated with a lower risk of restenosis in the side branch. In contrast, a complex approach does not appear to give any benefit in terms of early or long-term outcome or restenosis rate. [less ▲]

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See detailInfluence of nonlocal electrodynamics on the anisotropic vortex pinning in YNi2B2C
Silhanek, Alejandro ULg; Thompson, J. R.; Civale, L. et al

in Physical Review. B : Condensed Matter (2001), 64(1),

We have studied the pinning force density F-p of YNi2B2C superconductors for various field orientations. We observe anisotropies both between the c axis and the basal plane and within the plane that ... [more ▼]

We have studied the pinning force density F-p of YNi2B2C superconductors for various field orientations. We observe anisotropies both between the c axis and the basal plane and within the plane that cannot be explained by the usual mass anisotropy. For magnetic field H parallel toc, the reorientation structural transition in the vortex lattice due to nonlocality, which occurs at a field H(1)similar to1 kOe, manifests itself as a kink in F-p(H). When H perpendicular toc, F-p is much larger and has a quite different H dependence, indicating that other pinning mechanisms are present. In this case the signature of nonlocal effects is the presence of a fourfold periodicity of F-p within the basal plane. [less ▲]

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See detailCorrect regimen of fluoride and calcium reduces the risk of vertebral fractures in postmenopausal osteoporosis
Reginster, Jean-Yves ULg; Rovati, L; Setnikar, I

in Osteoporosis International (2001), 12

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See detailAuto/biographie. Le dispositif Mallarmé/Verlaine
Durand, Pascal ULg

in Littératures (2001), 44(printemps), 97-119

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See detailLa représentation des travailleurs à l’heure de la flexibilité : conséquences, enjeux et perspectives
Agro, Linda ULg; Dieu, Anne-Marie; Schoenaers, Frédéric ULg

in Revue de Gestion des Ressources Humaines (2001), 39

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See detailDernier hoquet à Francorchamps
Abu Dalu, Firass ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2001)

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See detailGenesis of clone size heterogeneity in megakaryocytic and other hemopoietic colonies: the stochastic model revisited
Paulus, Jean-Michel ULg; Levin, Jack; Debili, Najet et al

in International Society for Experimental Hematology (2001), 29(nd), 1256-69

OBJECTIVE: We previously showed that the distributions of the numbers of doublings (NbD) undergone by individual megakaryocyte progenitors before commitment to polyploidization are markedly skewed and can ... [more ▼]

OBJECTIVE: We previously showed that the distributions of the numbers of doublings (NbD) undergone by individual megakaryocyte progenitors before commitment to polyploidization are markedly skewed and can consistently be fitted to straight lines when plotted on semilogarithmic coordinates. The slope of such lines, which yields the probability of polyploidization per doubling, is made less steep by stimulators of megakaryocyte colony formation and is less steep in mixed erythroid-megakaryocyte than in pure megakaryocyte colonies. Therefore, megakaryocytopoiesis provides a unique model for the study of clonal heterogeneity in a hemopoietic lineage, which is the subject of this review. DATA SOURCES: Articles relevant to the interpretation of these data were selected from the authors' and public databases. DATA SYNTHESIS: Exponential NbD distributions were first explained by postulating that following the assembly of thrombopoiesis-specific regulators, megakaryocyte progenitors require only a single random event to arrest proliferation and commit to polyploidization. However, this stochastic model was refuted by data indicating that intrinsic properties of individual progenitors affect the NbD they achieve. We suggest that the unequal repartition of critical compounds (including receptors, signaling molecules, and gene regulators) inherent in the stem cell-progenitor transition causes a heritable heterogeneity in megakaryocyte progenitor responsiveness to polyploidization inducers. This model would be compatible with 1) the evidence for intraclonal synchronization in megakaryocyte and other hemopoietic clones generated by committed progenitors; 2) the low probability of polyploidization of the relatively insensitive bipotent megakaryocyte progenitors; and 3) the thesis that stimulators act in part by recruiting megakaryocyte progenitor cells endowed with lesser responsiveness to polyploidization inducers and higher proliferative potential. CONCLUSION: The responsiveness of individual megakaryocyte progenitors to polyploidization inducers may be a major determinant of the exponential shape of NbD distributions. [less ▲]

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See detailLes flux d'azote mobilisés par les agricultures belges
Debouche, Charles ULg

in Bulletin d'Information (Association Royale des Ingénieurs Issus de la Fusagx - Aigx) (2001), 4

Les flux de matières azotées mobilisés par les exploitations agricoles sont identifiés et quantifiés par divers modèles mathématiques. Ceux-ci sont conçus de manière à pouvoir être appliqués tant au ... [more ▼]

Les flux de matières azotées mobilisés par les exploitations agricoles sont identifiés et quantifiés par divers modèles mathématiques. Ceux-ci sont conçus de manière à pouvoir être appliqués tant au niveau d'une exploitation agricole qu'au niveau d'un territoire déterminé. Après avoir décrit succinctement ces modèles, leurs caractéristiques et leurs limites, le résultat de leur application aux agricultures flamande et wallonne est présenté. Il met en évidence une différence importante entre ces deux agricultures, notamment quant à leurs responsabilités environnementales. Les flux d'azote mobilisés par des exploitations agricoles existantes sont également estimés. Ils illustrent la grande diversité de comportement d'exploitations agricoles apparemment semblables. [less ▲]

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