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See detailSquare cells in gravitational and capillary thermoconvection
Regnier, Vincent; Dauby, Pierre ULg; Parmentier, P. et al

in Physical Review. E : Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics (1997), 55(6), 6860-6865

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See detailHepatocyte transplantation prolongs survival and prevent development of brain edema in pigs with ischemic liver failure
Arkadopoulos, N.; Chen, S.; Khalili, T. et al

in Surgical Forum (1997), 44

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See detailLeaf carbohydrate status in Lolium temulentum during the induction of flowering
Périlleux, Claire ULg; Bernier, Georges ULg

in New Phytologist (1997), 135(1), 59-66

Unifoliated plants of Lolium temulentum L. ev. Ceres, a qualitative long-day grass, were induced to flower by one 24-h long day (LD) or by one 8-h short day (SD) advanced by 1 2 h in the normal regime, so ... [more ▼]

Unifoliated plants of Lolium temulentum L. ev. Ceres, a qualitative long-day grass, were induced to flower by one 24-h long day (LD) or by one 8-h short day (SD) advanced by 1 2 h in the normal regime, so-called 'displaced short day' (DSD). Standard light for SD and DSD was a mixture of fluorescence and incandescence at 400 µmol m2 s-1 whereas the extension period of the 24-h LD was solely incandescence at 10-15 µmol m2 s-1. The DSD system was first characterized by the timings of floral induction, stimulus translocation and apical development. Carbohydrates in the blade tissues and in leaf exudate were analysed comparatively in vegetative and induced plants. Fructans were not detected in the leaf tissues whereas sucrose and starch were found to be present in similar amounts. In SD, their contents exhibited a diurnal fluctuation and were not in large excess. The common change observed during the two inductive treatments was that starch remained at a high level during the LD extension, even though the lighting was unsuitable for photosynthesis, and increased transiently in DSD. Sucrose was the major sugar contained in the leaf exudate. Its content increased when flowering was induced, but not at the same time in the two systems. In LD, sucrose exudation rose when plants were returned to standard light after the inductive cycle, i.e. after the LD stimulus had left the leaf blade. By contrast, during the DSD, sucrose was transported at the same time as the floral stimulus. Results are discussed together with the methods used to time stimulus translocation and their implications. [less ▲]

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See detailNouvelles recherches dans le site magdalénien du Trou da Somme (Hastière)
López Bayón, Ignacio; Léotard, Jean-Marc; Otte, Marcel ULg et al

in Notae Praehistoricae (1997), 17

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See detailLe clonage par transfert de noyau dans l'espèce bovine
Ectors, Fabien ULg; Delval, Alain; Beckers, Jean-François ULg et al

in Annales de Médecine Vétérinaire (1997), 141

A all in vitro cloning technique was developed in wich embryos from the first cycle nuclear transfer (cloning) were used as blastomere donor for the second cycle nuclear transfer (re-cloning). Such method ... [more ▼]

A all in vitro cloning technique was developed in wich embryos from the first cycle nuclear transfer (cloning) were used as blastomere donor for the second cycle nuclear transfer (re-cloning). Such method permitted to produce 14,5% of morulae and 14,9% of blastocysts after the first and second cycle of nuclear transfer, respectively. The rates of birth obtained after transfer of such embryos were 21,4% and 20,5% for first and second cyle respectively, corresponding to 6 and 5 calves for 28 and 24 transferred embryos. Unfortunately, gestation patholgies and an increase of birth weights were observed. It seems that the in vitro presence of gametes and/or embryos may be responsible of an alteration in the control of gene expression. [less ▲]

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See detailInfluence du climat sur l'évolution de la population de tétras lyres Tetrao tetrix dans les Hautes-Fagnes de Belgique de 1967 à 1996
Loneux, Michèle ULg; Lindsey, James ULg; Ruwet, Jean-Claude

in Cahiers d'Ethologie (1997), 17(2-3-4), 345-386

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See detailQuantitative variations of indolyl compounds including IAA, IAA-aspartate and serotonin in walnut microcuttings during root induction
Gatineau, F.; Fouché, J. G.; Kevers, Claire ULg et al

in Biologia Plantarum (1997), 39(1), 131-137

Shoots of the hybrid walnut Juglans nigra x Juglans regia contained serotonin in the micromole range and indole-3-acetic acid (IAA) in the nanomole range. The serotonin level fell by 40 % in 12 h in auxin ... [more ▼]

Shoots of the hybrid walnut Juglans nigra x Juglans regia contained serotonin in the micromole range and indole-3-acetic acid (IAA) in the nanomole range. The serotonin level fell by 40 % in 12 h in auxin (IBA) treated whole shoots and then reincreased to a maximum (50 % over the control) after 36 h. The same pattern was followed in the top portions of the shoot but in the shoot bases, serotonin always remained under the control level. The early decrease of serotonin was correlated with an increase in IAA-aspartate. The early decrease and peaking of the serotonin level preceded and corresponded to the increase and peaking of free IAA in the shoot bases. The initial serotonin pool in treated-to-root shoots might thus suffice for the biosynthesis of IAA and IAA-conjugated compounds. Because of its auxin-like properties, the early serotonin peak might be taken into consideration as an endogenous auxin signal for rooting in the present material. If this turns out to be so, the rooting signal for the shoot bases necessarily should come from the apices. [less ▲]

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See detailAre temperature-induced early changes in auxin and polyamine levels related to flowering in Phalaenopsis?
Fouche, J. G.; Jouve, L.; Hausman, J. F. et al

in Journal of Plant Physiology (1997), 150(1-2), 232-234

Phalaenopsis plants flowered 3 1/4 months after passing from a 24/22 °C day/night to a 22/17°C regime without changing the photoperiod (12:12). The new thermoperiodic treatment induced rapid IAA ... [more ▼]

Phalaenopsis plants flowered 3 1/4 months after passing from a 24/22 °C day/night to a 22/17°C regime without changing the photoperiod (12:12). The new thermoperiodic treatment induced rapid IAA fluctuations (with a significant peaking between day 2 and day 5), and about the same fluctuation for putrescine. Since flowering occurred much later and because quite similar results were observed during plant cold acclimation, the relationships of the biochemical changes registered with flowering induction were questioned. [less ▲]

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See detailFirst epidemiological data on pathogenic leptospires isolated on the Azorean islands
Collares-Pereira, Margarida; Korver, H.; Terpstra, W. J. et al

in European Journal of Epidemiology (1997), 13

Insectivores (Erinaceus europaeus) and rodents (Rattus rattus, R. norvegicus and Mus musculus) from different islands of the Azores archipelago were found to carry three distinct Leptospira interrogans s ... [more ▼]

Insectivores (Erinaceus europaeus) and rodents (Rattus rattus, R. norvegicus and Mus musculus) from different islands of the Azores archipelago were found to carry three distinct Leptospira interrogans s.l. serovars (copenhageni, icterohaemorrhagiae and ballum) which have never been previously investigated there. The house mouse and the black rat were the major Leptospira reservoir showing isolation rates ranging from 0% for both species (in Graciosa) to 88 % and 33 %, respectively (in São Miguel). This study also showed that the majority of the animals with positive kidney cultures exhibited specific agglutinins agaibst the isolated strains of Leptospira. The observed isalation rates in the different islands, with a very interesting island variation in prevalence, suggest that small mammals, serving as sylvatic reservoirs of pathogenic leptospires, may represent an important risk to the health of humans and the livestock, particularly in the islands of Terceira and São Miguel. [less ▲]

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See detailOrientation des objectifs et participation à des activités sportives
Ledent, Maryse; Telama, Risto; Cloes, Marc ULg et al

in Sport (1997), 159/160

Il existe une multitude de facteurs d'influence qui rendent la prévision d'une participation à l'activité sportive particulièrement délicate: influences biologiques et démographiques, psychologiques ... [more ▼]

Il existe une multitude de facteurs d'influence qui rendent la prévision d'une participation à l'activité sportive particulièrement délicate: influences biologiques et démographiques, psychologiques, sociales et environnementales. ... [less ▲]

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See detailLe Système d'informations sur la Biodiversité en Wallonie.
Dufrêne, Marc ULg

in Les cahiers des Réserves Naturelles RNOB (1997), 11

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See detailTwo centuries of vaccination
Vanderplasschen, Alain ULg; Smith, G. L.

in Annales de Médecine Vétérinaire (1997), 141

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See detailComparative evaluation of five hygroscopic condenser humidifiers during short-term postoperative mechanical ventilation
Sottiaux, Thierry; Meurice, F.; Mignolet, Ghislaine ULg et al

in Acta Anaesthesiologica Italica & Anaesthesia and Intensive Care in Italy (1997), 48(1-2), 59-68

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See detailNos élèves préfèrent Pythagore à Newton
Monseur, Christian ULg

in Pilotinfo (1997), 20(septembre),

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See detailDietary fibre in dogs diet : comparisons between cellulose, pectin, guar gum, and between two incorporation rates of guar gum
Diez, Marianne ULg; Van Eenaeme, Christian ULg; Hornick, Jean-Luc ULg et al

in Journal of Animal Physiology & Animal Nutrition (1997), 78

Ausgewachsene Beagle-Hunde erhielten eine Kontrolldiaet (I) aus Hackfleisch und Reis oder mit Cellulose (II), Pektin (III) bzw. Guar (IV) angereicherte Diaeten mit einem Anteil von 3.4% in der ... [more ▼]

Ausgewachsene Beagle-Hunde erhielten eine Kontrolldiaet (I) aus Hackfleisch und Reis oder mit Cellulose (II), Pektin (III) bzw. Guar (IV) angereicherte Diaeten mit einem Anteil von 3.4% in der Trockenmasse. Bei Diaet IV tendierte die Magenentleerungsrate zu niedrigeren Werten. Die intestinale Absorption von Xylose wurde durch die Diaeten IV und III nicht beeinflusst, aber durch Diaet II sign. verlangsamt. Die Varianten III und IV fuehrten zu geringeren Trockenmassegehalten im Kot(p less than 0.001). Die zugefuehrten Faserstoffe senkten teilweise die Naehrstoffverdaulichkeit. Die preprandialen Plasmakonzentrationen an Glucose, Insulin, alpha-Amino-N, Harnstoff und Triglyceriden blieben unbeeinflusst. Die Diaet IV bewirkte einen deutlichreduzierten postprandialen Anstieg von alpha-Amino-N (p less than 0.05) und Harnstoff (p less than 0.01) im Plasma sowie geringere Cholesteringehalte bei gefuetterten und nuechternen Tieren (p less than 0.05). Ein weiterer Versuch mit 3.5% bzw. 7% Guaranteil in der Diaet zeigte dosisabhaengige Effekte. [less ▲]

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See detailInfluence of dominance relationships on the estimation of dominance variance with sire-dam subclass effects
Gengler, Nicolas ULg; VanVleck, L. D.; MacNeil, M. D. et al

in Journal of Animal Science (1997), 75(11), 2885-2891

Two data sets from the USDA Livestock and Range Research Laboratory mere analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 ... [more ▼]

Two data sets from the USDA Livestock and Range Research Laboratory mere analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 weaning weight) records of inbred USDA Line 1 Herefords. The second consisted of 8,065 birth weight (7,380 weaning weight) records from a line-cross experiment with five lines. Two models were used. Both included fixed effects of year-sex of calf and age of dam, and covariates for calving date, inbreeding of animal, and inbreeding of dam. For the second set, additional covariates were line composition and heterozygosity coefficients. Random effects were direct and maternal additive genetic, maternal permanent environment, sire-dam subclass, and residual. Model 1 considered sire-dam subclasses unrelated. Model 2 related sire-dam subclasses with a parental dominance relationship matrix. Variance components were estimated using REML. Differences between estimates with Model 1 and 2 were unimportant except for dominance variance. For the first data set, estimates with Model 2 of relative genetic direct and maternal variances, direct-maternal correlation, permanent environment, and dominance variances for birth weight were .35, .13, -.02, .03, and .25, respectively, and they were .39, .11, .04, .06 and .14 for the second data set. For weaning weight, the first data set estimates were .20, .15, -.37, .19, and .11, respectively, and they were .16, .20, -.07, .18, and .18 for the second data set. Changes, decreases and increases, in estimates of dominance variances may be due to increased information from relationships and family types other than full-sibs. The assumption of unrelated sire-dam subclasses might not be appropriate for estimation of dominance variance in populations with many dominance relationships among siredam classes. [less ▲]

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See detailDamping rates of hard momentum particles in a cold ultrarelativistic plasma
Vanderheyden, Benoît ULg; Ollitrault, J. Y.

in Physical Review. D : Particles and Fields (1997), 56(8), 5108-5122

We compute the damping rates of one-particle excitations in a cold ultrarelativistic plasma to leading order in the coupling constant e for three types of interaction: Yukawa coupling to a massless scalar ... [more ▼]

We compute the damping rates of one-particle excitations in a cold ultrarelativistic plasma to leading order in the coupling constant e for three types of interaction: Yukawa coupling to a massless scalar boson, QED, and QCD. Damping rates of charged particles in QED and QCD are of order e(3) mu, while the damping rates of other particles are of order e(4) mu or e(4) mu log(1/e). We find that the damping rate of an electron or of a quark is constant far from the Fermi surface, and decreases linearly with the excitation energy close to the Fermi surface. This unusual behavior is attributed to the long-range magnetic interactions. [less ▲]

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See detailRoquentin et les types sans importance sociale
Denis, Benoît ULg

in Etudes Françaises (1997), XXXIII(3), 105-119

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See detailFibres alimentaires chez le chien V. Effets sur le métabolisme glucidique. Application dans le traitement du diabète
Diez, Marianne ULg; Istasse, Louis ULg

in Annales de Médecine Vétérinaire (1997), 141

Some dietary fibres are characterized by hypoglycaemic and hypoinsulinemic effects in humans and in carnivores. At present, these properties are used in the treatment of diabetes mellitus in both species ... [more ▼]

Some dietary fibres are characterized by hypoglycaemic and hypoinsulinemic effects in humans and in carnivores. At present, these properties are used in the treatment of diabetes mellitus in both species. Finally, the dietary treatment of the diabetic dog is presented with a particular emphasis on the use of dietary fibres. [less ▲]

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See detailVrbis-Orbis (Ovide, Fastes, II, 684)
Rochette, Bruno ULg

in Latomus : Revue d'Etudes Latines (1997), 56(3), 551-553

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See detailUne hyperparathyroïdie, vous êtes certain ?
Geenen, Vincent ULg

in Actualité Médicale Belge (1997), 541

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See detailMultiple pregnancy-associated glycoproteins are secreted by day 100 sheep placenta
Xie, Sancai; Green, Jonathan; Bao, Bagna et al

in Biology of Reproduction (1997), 57(6), 1384-1393

Pregnancy-associated glycoprotein (PAG)-1 (PAG1) and pregnancy-specific protein B are either identical or closely related antigens released by trophoblast binucleate cells of placentas of cattle. Sheep ... [more ▼]

Pregnancy-associated glycoprotein (PAG)-1 (PAG1) and pregnancy-specific protein B are either identical or closely related antigens released by trophoblast binucleate cells of placentas of cattle. Sheep and other ruminants produce similar products. There is evidence, however, that these antigens, which are related structurally to the pepsinogens and other aspartic proteinases, are not single gene products but members of an extensive family. Here, the sequential use of ammonium sulfate precipitation and Sepharose blue, anion-exchange, and cation-exchange chromatographies, as well as isoelectric elution from a Mono P column, has allowed several PAG1-related molecules to be purified from the medium after culture of explants from Day 100 sheep placentas. Each of these PAGs cross-reacted to a varying extent with a panel of three different anti-PAG1 antisera. Four of them, all of which were major secretory products of the placenta, were subjected to amino-terminal microsequencing. Although each was related to ovine (ov) PAG1, none was identical. Reverse transcription-polymerase chain reaction was then used to amplify PAG1-related cDNA from Day 100 placental RNA. Seven novel full-length cDNA, all distinct from ovPAG1, were identified from 25 cDNA selected for sequencing. Only two of these (ovPAG3 and ovPAG7) encoded polypeptides identical in sequence at their inferred amino termini to one of the PAGs (ovPAG65) purified from explant cultures. Even so, they were only 84% identical in overall sequence. The remaining five cDNA were unique. In situ hybridization analysis revealed that expression of ovPAG3 and ovPAG7, like that of ovPAG1, is confined to trophoblast binucleate cells. The data confirm that at Day 100 of pregnancy the ovine placenta produces many different PAGs, which differ considerably in sequence and immunological cross-reactivity. [less ▲]

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See detailA novel virus blinding assay using confocal microscopy: demonstration that the intracellular and extracellular vaccinia virions bind to different cellular receptors
Vanderplasschen, Alain ULg; Smith, G. L.

in Journal of Virology (1997), 71

Vaccinia virus (VV) produces two antigenically and structurally distinct infectious virions, intracellular mature virus (IMV) and extracellular enveloped virus (EEV), which bind to unidentified and ... [more ▼]

Vaccinia virus (VV) produces two antigenically and structurally distinct infectious virions, intracellular mature virus (IMV) and extracellular enveloped virus (EEV), which bind to unidentified and possibly different cellular receptors. Studies of VV binding have been hampered by having two infectious virions and by the rupture of the EEV outer membrane in the majority of EEV virions during purification. To overcome these problems, we have developed a novel approach to study VV binding that is based on confocal microscopy and does not require EEV purification. In this assay, individual virus particles adsorbed to the cell are simultaneously distinguished and quantified by double immunofluorescence labelling with antibody markers for EEV and IMV. By this method, we show unequivocally that IMV and EEV bind to different cellular receptors. Three independent observations allow this conclusion. First, the efficiencies with which IMV and EEV bind to different cell lines are unrelated; second, cell surface digestion with some enzymes affects IMV and EEV binding differently; and third, the binding of a monoclonal antibody to cells prevents IMV binding but not EEV binding. This technique may be widely applicable for studying the binding of different viruses. [less ▲]

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See detailPotential of Varicella zoster virus thymidine kinase as a suicide gene in breast cancer cells
Grignet, Christine ULg; Calberg-Bacq, Claire-Michelle

in Gene Therapy (1997), 4

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See detailFibres alimentaires chez le chien III. Effets sur les structures intestinales et les fermentations. Applications dans le traitement de certains dysfonctionnements intestinaux
Diez, Marianne ULg; Istasse, Louis ULg

in Annales de Médecine Vétérinaire (1997), 141

Dietary fibres can modify the intestinal structure in dogs and other animal species. The main changes concern not only the morphology of the gastrointestinal tract but also the ultrastructures ... [more ▼]

Dietary fibres can modify the intestinal structure in dogs and other animal species. The main changes concern not only the morphology of the gastrointestinal tract but also the ultrastructures. Furthermore, soluble and partly-soluble fibres are fermented in the large bowel; the fermentation products have different metabolic effects. The physical and chemical properties of fibres can be used for the dietary therapy of some intestinal pathologies [less ▲]

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See detailOverhead Lines galloping and turbulent wind
Chabart, Olivier; Lilien, Jean-Louis ULg

in Bulletin Scientifique de l'Association des Ingénieurs Electriciens sortis de l'Institut Electrotechnique Montefiore (1997), 1

Galloping is modelled considering actual turbulent wind using frequency spectrum of the wind and spatial coherence.

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See detailFibres alimentaires chez le chien VI. Effets sur le métabolisme lipidique, les sécrétions biliaires et application dans le traitement de l'obésité
Diez, Marianne ULg; Istasse, Louis ULg

in Annales de Médecine Vétérinaire (1997), 141(5), 363-372

Dietary fibres are able to affect lipids profiles in humans. The soluble and partly soluble fibres have mainly been studied in this purpose. Although hyperlipidaemia are known in dogs, there are few ... [more ▼]

Dietary fibres are able to affect lipids profiles in humans. The soluble and partly soluble fibres have mainly been studied in this purpose. Although hyperlipidaemia are known in dogs, there are few studies on the subject. The mechanisms by which fibres are involved are discussed with a particular emphasis on bile secretion. [less ▲]

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See detailQuelques reflexions sur les contraintes alimentations dans la production caprine en milieu tropical
Mayombo, Asangule Pierre; Hornick, Jean-Luc ULg

in Le N'Dama (1997)

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See detailTrajectoire déviante à la lisière entre adolescence et âge adulte
Gavray, Claire ULg

in Déviance et Société (1997), 21(3), 273-288

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See detail"Saint Lambert au banquet de Jupille". Auguste Chauvin (1810-1884) et la peinture d'histoire
George, Philippe ULg

in Bulletin de la Société Royale Le Vieux-Liège (1997), T. XIII, n° 276

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See detailThe two beta-lactamase genes of Streptomyces cacaoi, blaL and blaU, are under the control of the same regulatory system.
Magdalena, J; Gérard, Christine; Joris, Bernard ULg et al

in Molecular & General Genetics [=MGG] (1997), 255(2), 187-93

The production of beta-lactamase in Streptomyces cacaoi, which contains two beta-lactamase-encoding genes, blaL and blaU, is inducible by beta-lactam compounds. The two genes have been cloned ... [more ▼]

The production of beta-lactamase in Streptomyces cacaoi, which contains two beta-lactamase-encoding genes, blaL and blaU, is inducible by beta-lactam compounds. The two genes have been cloned independently in S. lividans TK24, a beta-lactamase-negative species. The blaU clone did not respond to the presence of beta-lactams, whereas the blaL clone appeared to be inducible in S. lividans. The latter clone contains two open reading frames, blaA and blaB, located just upstream of but transcribed divergently from blaL, which were shown to be required for the production as well as the induction of BlaL. The deduced BlaA protein belongs to the LysR family of transcription regulators. In order to examine the role of BlaA in regulation, we here report on over-expression of a GST-BlaA fusion protein in Escherichia coli and its use for antibody preparation. The GST-BlaA fusion protein was partially purified and bandshift assays showed that it bound the 197-bp blaL-blaA intergenic region. The BlaA DNA binding-site was further restricted to a 30-bp sequence containing a T-N11-A motif, a characteristic of LysR-type promoters. Another T-N11-A motif upstream of the blaU gene was also shown to bind BlaA. The affinities of these two T-N11-A motifs in BlaA binding were comparable. A plasmid bearing the blaU structural gene and the blaA-blaB regulatory region was constructed and shown to confer on an S. lividans host the capacity to produce inducible beta-lactamase. It can thus be concluded that the S. cacaoi blaL and blaU genes are controlled by the same regulatory system. [less ▲]

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See detailDiagnostic de l'ostéoporose
Devogelaer, JP; Reginster, Jean-Yves ULg; Raeman, F et al

in Medipractice (1997), 21

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See detail67-kD laminin receptor expression correlates with worse prognostic indicators in non-small cell lung carcinomas.
Fontanini, G.; Vignati, S.; Chine, S. et al

in Clinical Cancer Research : An Official Journal of the American Association for Cancer Research (1997), 3(2), 227-31

Tumor samples obtained from 72 patients resected for non-small cell lung cancer were stained immunohistochemically using an immunoperoxidase method and the MLuC5 monoclonal antibody specific for the 67 ... [more ▼]

Tumor samples obtained from 72 patients resected for non-small cell lung cancer were stained immunohistochemically using an immunoperoxidase method and the MLuC5 monoclonal antibody specific for the 67-kDa laminin receptor. Sixty-one of 72 patients (84.7%) displayed a MLuC5-positive reaction, which was usually localized in both the inner surface of the plasmatic membranes and the cytoplasm of neoplastic cells. When we compared the laminin receptor expression with clinicopathological and biological parameters such as histotype, grading, T status, N status, ploidy, proliferative activity, vessel invasion, and p53 protein accumulation, the following results were observed: (a) the mean expression of the receptor was higher in the group of patients with metastatic nodal involvement than in those with uninvolved lymph nodes (P = 0.02); (b) a high Ki-67 score (>13% of positive cells) was observed in tumors with a higher mean value of laminin receptor (P = 0.004); (c) the tumors harboring neoplastic emboli in their vessels showed a higher laminin receptor immunoreactivity (P = 0.02); and (d) a borderline association was found between the high mean value of laminin receptor immunopositivity and p53 accumulation in neoplastic cell nuclei (P = 0.05). Our observations indicate that detection of high tissue levels of 67-kDa laminin receptor is associated with an invasive phenotype in non-small cell lung cancer and may provide further information in the biological characterization of this type of cancer. [less ▲]

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See detailRadiative Lifetimes for the 4p Excited States of Phosphorus and the Oscillator Strengths of Solar Lines
Berzinsh, U.; Svanberg, S.; Biémont, Emile ULg

in Astronomy and Astrophysics (1997), 326

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See detailVieillissement normal, démence d'Alzheimer et mémoire de travail
Van der Linden, Martial ULg; Collette, Fabienne ULg; Andrès Bénito, Pilar

in Psychologie Française (1997), 42

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See detailEtude comparative de la décontamination microbiologique, avec ou sans Biosol, de terres d'excavation contaminées par des hydrocarbures
Verstaete, W.; Van Eyck, L.; Thonart, Philippe ULg et al

in Tribune de l'Eau (La) (1997), 587/3

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See detailA Direct Dopaminergic Control of Aromatase Activity in the Quail Preoptic Area
Baillien, M.; Balthazart, Jacques ULg

in Journal of Steroid Biochemistry & Molecular Biology (1997), 63(1-3, Sep-Oct), 99-113

In the quail preoptic area (POA) anatomical and pharmacological data suggest that catecholamines may be implicated in the control of testosterone (T) aromatization into estrogens. The biochemical ... [more ▼]

In the quail preoptic area (POA) anatomical and pharmacological data suggest that catecholamines may be implicated in the control of testosterone (T) aromatization into estrogens. The biochemical mechanism(s) mediating this control of the enzyme activity is (are) however unexplored. The present studies were carried out to investigate whether the catecholamines, dopamine (DA) and norepinephrine (NE) are able to directly affect aromatase activity (AA) measured during in vitro incubations of POA homogenates. AA was quantified in the POA-hypothalamus of adult male Japanese quail by measuring the tritiated water production from [1beta-3H]-androstenedione. Enzyme activity was linear as a function of the incubation time and of the protein content of homogenates. It exhibited a typical Michaelis-Menten kinetics, with an apparent Km of 2.8 nM and a Vmax of 266.6 fmol h(-1) mg wet weight(-1). AA was then measured at a substrate concentration of 25 nM in the presence of catecholamines and some of their receptor agonists or antagonists, at two concentrations, 10(-3) and 10(-6) M. Norepinephrine and prazosin (alpha1-adrenergic antagonist) had no or very limited effects on AA at both concentrations. In contrast, DA and some D1 and/or D2 receptor agonists (apomorphine[D1/D2], SKF-38393 [D1] and RU-24213 [D2]) depressed AA by 40 to 70% at the 10(-3) M concentration. One D2 receptor antagonist also produced a major inhibition of AA (sulpiride) while other antagonists either had no significant effect or only produced moderate decreases in enzyme activity (SCH-23390 [D1], spiperone [D2], pimozide [D2]) as did two DA indirect agonists, amfonelic acid and nomifensine. The inhibitory effect of the agonists was not antagonized by the less active antagonists, SCH-23390 [D1] or spiperone [D2]. Taken together these results suggest that the inhibitory effects do not involve specific binding of DA or its agonists/antagonists to dopaminergic receptors mediating changes in cAMP concentration. This conclusion is also supported by the observation that addition of dibutyryl cAMP did not change brain AA. It appears more likely that DA and dopaminergic drugs inhibit AA by a direct effect on the enzyme, as suggested by the competitive nature of DA and SKF-38393 inhibition of AA (Ki's of 59 and 84 microM, respectively). The functional significance of this effect should still be demonstrated but this mechanism may represent an important physiological pathway through which neurotransmitters could rapidly affect steroid-dependent processes such as the neural synthesis of estrogens. This would provide a mean by which environmental stimuli could affect reproductive behavior and physiology. [less ▲]

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See detailLes peuplements à graines. Concept, réglementations et mise en oeuvre.
Vanslembrouck, C.; Rondeux, Jacques ULg

in Silva Belgica (1997), 104(4), 17-21

La rentabilité de la propriété forestière qui, dans une large mesure, conditionne la pérennité des forêts gérées intensivement fait de plus en plus l'objet des préoccupations des chercheurs, sylviculteurs ... [more ▼]

La rentabilité de la propriété forestière qui, dans une large mesure, conditionne la pérennité des forêts gérées intensivement fait de plus en plus l'objet des préoccupations des chercheurs, sylviculteurs, gestionnaires et responsables des politiques forestières. Dans ce contexte, lorsqu'il s'agit de la création et de l'enrichissement de peuplements, veiller à respecter la meilleure adéquation possible entre le sol et l'essence n'est pas tout, encore faut-il ensuite utiliser un matériel génétique de qualité en particulier lors de régénérations artificielles. C'est à ce dernier point, et plus particulièrement aux peuplements à graines, que les lignes suivantes sont consacrées. Nous envisagerons successivement ce qu'il convient communément d'entendre par peuplement à graines (§ 2), sa raison d'être (§ 3) et le processus d'identification de celui-ci (§ 4) avant de tirer quelques brèves conclusions. [less ▲]

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See detailComment les enseignants évaluent-ils la géométrie au premier degré de l'enseignement secondaire ?
Burton, Réginald; Detheux-Jehin, Monique; Fagnant, Annick ULg

in Informations pédagogiques (1997), 38(15), 24

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See detailSimulation of the morphology of the Jovian UV north aurora observed with the Hubble Space Telescope
Grodent, Denis ULg; Gladstone, G. R.; Gérard, Jean-Claude ULg et al

in Icarus: International Journal of Solar System Studies (1997), 128(2), 306-321

A model simulating Earth views of UV auroral arcs and diffuse emissions in the Jovian north polar region is described. It assumes a Chapman profile of vertical brightness distribution and various ... [more ▼]

A model simulating Earth views of UV auroral arcs and diffuse emissions in the Jovian north polar region is described. It assumes a Chapman profile of vertical brightness distribution and various horizontal structures, Simple geometric cases are described to illustrate the dependence on the altitude, atmospheric scale height, and central meridian planetary longitude (CML) of an idealized amoral morphology seen from Earth orbit, The numerical simulation makes it possible to assess the importance of limb brightening and the contribution from high altitude auroral emission located behind the planetary limb. As an application of the simulation model, four images obtained with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope are used to determine the characteristics of their auroral (discrete and diffuse) structures, The apparent brightness distribution along the arcs can only be reproduced if intrinsic longitudinal (or local time) variations are introduced, in addition to the path length effects of the viewing geometry, A composite average auroral distribution is built by mapping 10 WFPC2 images from the same dataset, It illustrates the dichotomy frequently observed between a narrow single structure are at System III longitudes larger than 180 degrees (or morning sector) and the multiple are and broad diffuse emission at longitudes less than 180 degrees (or afternoon sector), It is shown that the equatorial auroral emission boundary is located between the 6R(J) and the 30R(J) magnetic field line footprints of the Goddard Space Flight Center (GSFC) O-6 model. (C) 1997 Academic Press. [less ▲]

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See detailSignes cliniques et diagnostic des tumeurs de la cavité nasale chez le chien: une analyse de 81 cas.
Clercx, Cécile ULg; Peeters, Dominique ULg; Gilbert, S. et al

in Annales de Médecine Vétérinaire (1997), 141

The paper describes clinical signs and diagnosis in 81 cases of intranasal tumors n the dog, examined at the Small Animal Clinic of the Faculty of Veterinary Medicine of the University of Liege (1990-1995 ... [more ▼]

The paper describes clinical signs and diagnosis in 81 cases of intranasal tumors n the dog, examined at the Small Animal Clinic of the Faculty of Veterinary Medicine of the University of Liege (1990-1995). Recent diagnostic techniques and therapeutic options are discussed. The most frequently encountered signs included a decreased or absence of unilateral air passage, observed in 78 cases (96%), and hemorrhagic discharge, observed in 65 cases (80%). Histopathology identified 2 benign and 79 malignant tumors, 57 epithelial and 22 mesenchymatous, including 2 lymphomas. In 74 cases, rhinoscopy identified an intranasal neoplastic mass; in the 7 remaining cases, tissular material of undetermined nature was observed, and histology of biospsied material confirmed the neoplastic nature. The time interval between the diagnosis and the death of the animal (spontaneous or by euthanasia) was longer in dogs with an intranasal sarcoma (mean time interval of 7 months) than in dogs with an intranasal carcinoma (mean time interval of 3 months). [less ▲]

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See detailLes moyens de se prémunir contre la défaillance de ses cocontractants
Georges, Frédéric ULg

in Actualités du Droit (1997)

Cette contribution commentait l'impact de la réforme de 1997 du droit de l'insolvabilité sur les droits des créanciers

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See detailToxicological investigations on four sperm whales stranded on the Belgian coast: inoganic contaminants
Bouquegneau, Jean-Marie ULg; Debacker, Virginie ULg; Gobert, Sylvie ULg et al

in Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre (1997), 67

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See detailDe l’acyclovir au valacyclovir: la biodisponibilité en plus de l’efficacité et de la tolérance
Rentier, Bernard ULg

in Virologics (1997), (Septembre), 10-11

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See detailTheoretical study of slope effects in resistivity surveys and applications
Sahbi, Hassan; Jongmans, Denis; Charlier, Robert ULg

in Geophysical Prospecting (1997), 45(5), 795-808

When electric soundings are made over an irregular terrain, topographic effects can influence the values of apparent resistivity and lead to erroneous 1D interpretation. A 3D finite-element method has ... [more ▼]

When electric soundings are made over an irregular terrain, topographic effects can influence the values of apparent resistivity and lead to erroneous 1D interpretation. A 3D finite-element method has been applied to study the topographical effect of a slope on Schlumberger soundings parallel to the strike. When the resistivity survey is performed at the top of the slope, the apparent resistivity values can be two times higher than in the flat-earth case, depending on the angle (alpha) and height (H) of the slope, and on the distance (X) between the sounding and the slope top. The results are presented as nondimensional curves which can be used for evaluating topographic anomalies for any value of the parameters alpha, H and X. It is numerically shown that the topographic effects can be removed from measurements on horizontally layered structures with an irregular earth surface. Real measurements were performed in different geological conditions over an irregular terrain. The correction method based on the nondimensional curves has been applied to the data and has enabled the determination of the correct layered ground configuration using 1D interpretation. [less ▲]

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See detailEffect of nadroparin, a low-molecular-weight heparin, on clinical and angiographic restenosis after coronary balloon angioplasty: the FACT study. Fraxiparine Angioplastie Coronaire Transluminale.
Lablanche, J. M.; McFadden, E. P.; Meneveau, N. et al

in Circulation (1997), 96(10), 3396-402

BACKGROUND: Experimental studies suggest that the antiproliferative effect of heparin after arterial injury is maximized by pretreatment. No previous studies of restenosis have used a pretreatment ... [more ▼]

BACKGROUND: Experimental studies suggest that the antiproliferative effect of heparin after arterial injury is maximized by pretreatment. No previous studies of restenosis have used a pretreatment strategy. We designed this study to determine whether treatment with nadroparin, a low-molecular-weight heparin, started 3 days before the procedure and continued for 3 months, affected angiographic restenosis or clinical outcome after coronary angioplasty. METHODS AND RESULTS: In a prospective multicenter, double-blind, randomized trial, elective coronary angioplasty was performed on 354 patients who were treated with daily subcutaneous nadroparin (0.6 mL of 10,250 anti-Xa IU/mL) or placebo injections started 3 days before angioplasty and continued for 3 months. Angiography was performed just before and immediately after angioplasty and at follow-up. The primary study end point was angiographic restenosis, assessed by quantitative coronary angiography 3 months after balloon angioplasty. Clinical follow-up was continued up to 6 months. Clinical and procedural variables and the occurrence of periprocedural complications did not differ between groups. At angiographic follow-up, the mean minimal lumen diameter and the mean residual stenosis in the nadroparin group (1.37+/-0.66 mm, 51.9+/-21.0%) did not differ from the corresponding values in the control group (1.48+/-0.59 mm, 48.8+/-18.9%). Combined major cardiac-related clinical events (death, myocardial infarction, target lesion revascularization) did not differ between groups (30.3% versus 29.6%). CONCLUSIONS: Pretreatment with the low-molecular-weight heparin nadroparin continued for 3 months after balloon angioplasty had no beneficial effect on angiographic restenosis or on adverse clinical outcomes. [less ▲]

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See detailLes antidotes en Médecine Vétérinaire
Delaunois, A.; Plume, Ch; Ansay, M. et al

in Annales de Médecine Vétérinaire (1997), 141

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See detailPd/SiO2-cogelled aerogel catalysts and impregnated aerogel and xerogel catalysts: Synthesis and characterization
Heinrichs, Benoît ULg; Noville, Francis ULg; Pirard, Jean-Paul ULg

in Journal of Catalysis (1997), 170(2), 366-376

Pd/SiO2 aerogel catalysts have been synthesized by cogelation of tetraethoxysilane with complex Pd2+[NH2-CH2-CH2-NH-(CH2)(3)-Si(OCH3)(3)](2) containing a hydrolysable silyl group. Pd catalysts have also ... [more ▼]

Pd/SiO2 aerogel catalysts have been synthesized by cogelation of tetraethoxysilane with complex Pd2+[NH2-CH2-CH2-NH-(CH2)(3)-Si(OCH3)(3)](2) containing a hydrolysable silyl group. Pd catalysts have also been prepared by impregnation of silica aerogels and xerogels with solutions of this complex or Pd2+(NH3)(4) followed by drying under hypercritical conditions or under vacuum. It appears that, in cogelled samples, the Pd2+ complex acts as a nucleation agent in the formation of silica particles. The resulting catalysts are then composed of completely accessible palladium crystallites with a diameter of about 2.3 nm located inside silica particles with a monodisperse microporous distribution centered on a hydraulic radius of 0.43 nm. The continuous meso- and macropore distribution is located in voids between particles and between aggregates constituted of those particles. In impregnated samples, it appears that Pd particles are located outside SiO2 particles. The relation between the texture of cogelled and impregnated catalysts and their behavior toward sintering has been studied in detail. In cogelled samples, it has been shown that Pd crystallites cannot migrate because they are trapped in the pores of SiO2 particles. These catalysts are sinterproof during hypercritical drying, When Pd crystallites are not trapped inside SiO2 particles, hypercritical drying leads to an extensive sintering of metal particles. During calcination of impregnated catalysts dried under vacuum, sintering occurs to a various extent depending on the support texture. The Pd crystallites size decreases when the pore size distribution is shifted toward the small sizes. (C) 1997 Academic Press. [less ▲]

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See detailGEQUAC, an Excess Gibbs Energy Model for Simulta¬neous Description of Associat-ing and Non-Associating Liquid Mixtures
Egner, K; Gaube, J; Pfennig, Andreas ULg

in Berichte der Bunsengesellschaft für physikalische Chemie (1997), 101(2), 209-218

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See detailAntibodies against vaccinia virus do not neutralize extracellular enveloped virus but prevent virus release from infected cells and comet formation
Vanderplasschen, Alain ULg; Hollinshead, M.; Smith, G. L.

in Journal of General Virology (The) (1997), 78(Pt 8), 2041-2048

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See detailFoaming properties of a natural cyclic lipoheptapeptide belonging to a special class of amphiphilic molecules
Razafindralambo, Hary ULg; Paquot, Michel ULg; Baniel, A. et al

in Food Hydrocolloids (1997), 11(1), 59-62

The foaming properties of surfactin, a natural cyclic lipoheptapeptide from Bacillus subtilis, were investigated in comparison and in association with those of bovine serum albumin (BSA). An apparatus ... [more ▼]

The foaming properties of surfactin, a natural cyclic lipoheptapeptide from Bacillus subtilis, were investigated in comparison and in association with those of bovine serum albumin (BSA). An apparatus combining bubbling, optical and conductimetric methods was used to study continuously foam formation and stability in terms of the quantity and density of foam. The increase in surfactin concentration from 0.05 to 0.2 mg/ml had little effect on its foaming capacity, measured by the bubbling time to produce the required foam volume, but improved the foam maximum density significantly. Surfactin produced foam with higher maximum density and stability, and forms more regular and smaller bubbles than BSA. In addition, a synergistic effect was observed on the stability of liquid in foam prepared with a mixture of 50:50 surfactin/BSA. The liquid half-life of BSA foam was enhanced up to 40% when surfactin was added to the solution. [less ▲]

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See detailObserved trends in total vertical column abundances of atmospheric gases from IR solar spectra recorded at the Jungfraujoch
Mahieu, Emmanuel ULg; Zander, Rodolphe ULg; Delbouille, Luc et al

in Journal of Atmospheric Chemistry (1997), 28(1-3), 227-243

Since 1984, about 15 000 high quality infrared solar spectra have been recorded with state-of-the-art grating and Fourier transform spectrometers at the International Scientific Station of the ... [more ▼]

Since 1984, about 15 000 high quality infrared solar spectra have been recorded with state-of-the-art grating and Fourier transform spectrometers at the International Scientific Station of the Jungfraujoch, Switzerland. Nonlinear least squares spectral curve fitting of selected microwindows containing isolated and well characterized lines of 20 telluric gases have allowed to retrieve their total vertical column abundances above the station, leading to observational data bases essential to derive long- and short-term changes experienced by these species during the last 12 years. In this paper, we focus on atmospheric gases of particular interest within the context of the EUROTRACTOR (Tropospheric Ozone Research) project; secular evolution as well as seasonal cycles of the minor constituents CH4, CO and of the trace gases C2H6, OCS, C2H2, HCN and H2CO are reported and discussed. The long-lived N2O is included as a tracer of the dynamic activity of the atmosphere. [less ▲]

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See detailEnergy savings in methanol synthesis: Use of heat integration techniques and simulation tools.
Maréchal, François; Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Computers & Chemical Engineering (1997), 21(Suppl. S), 511-516

Starting with a classical process for producing methanol using the reforming and synthesis steps, a combined approach applying simulation models and a new synthesis strategy, named Effect Modelling and ... [more ▼]

Starting with a classical process for producing methanol using the reforming and synthesis steps, a combined approach applying simulation models and a new synthesis strategy, named Effect Modelling and Optimisation (EMO), has been used to optimise the energy efficiency of the process. The method allows to identify different ways of improving the energy efficiency of the process. The modifications concern the synthesis reactor and the reforming reactor designs, the exploitation of the purge stream as fuel gas to satisfy the process requirement and its integration to a gas turbine system. The EMO approach allows to target the impact of a process modification at the global level of the energy cost of the process, including the combined production of heat and mechanical power in a gas turbine and the steam network. Starting with a classical methane conversion of 60% for the classical system, we identify solutions with up to 93% of the overall methane conversion when we transform the net mechanical power produced into methane savings at the country level. The interest of the approach is the possibility of computing the impact of the process modifications suggested by the analysis of the shape of the heat cascade on the overall energy balance of the plant without having to simulate in many details the steam and the heat exchanger network. [less ▲]

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See detailImmunohistochemical analysis of proliferative activity and steroid receptor expression in peritoneal and ovarian endometriosis
NISOLLE, Michelle ULg; Casanas-Roux, Françoise; Donnez, Jacques

in Fertility and Sterility (1997), 68(5), 912-919

Objective: To assess the proliferative activity of eutopic and ectopic endometrium throughout the menstrual cycle and its correlation to steroid receptor content. Design: The immunohistochemical use of Ki ... [more ▼]

Objective: To assess the proliferative activity of eutopic and ectopic endometrium throughout the menstrual cycle and its correlation to steroid receptor content. Design: The immunohistochemical use of Ki 67 was applied to investigate the proliferation index. A recently advanced stereographic computer technology was used to investigate steroid receptors. Setting: University hospital department of gynecology. Patient(s): Biopsies of eutopic endometrium, black and red peritoneal endometriotic lesions, and ovarian endometriomas were taken from infertile patients and classified according to the phase of the cycle. Result(s): In normal endometrium, the glandular proliferation index was highest during the proliferative phase and was statistically significantly reduced during the secretory phase. No proliferative activity was observed in the late secretory phase. No statistically significant differences were found between ectopic endometrium and eutopic endometrium except during the late secretory phase, when proliferative activity was still present in endometriotic tissue. The stromal proliferation index was similar in red lesions, ovarian endometriomas, and eutopic endometrium during the secretory phase. In normal endometrium, the highest concentrations of estrogen receptors (ERs) and P receptors (PRs) occurred in the epithelial and stromal cells during the late proliferative phase of the menstrual cycle. Estrogen receptor and PR content declined throughout the secretory phase. In ectopic endometrium, PR persisted in the glandular epithelium during the late secretory phase. Estrogen receptors persisted in the glandular epithelium and stroma of red peritoneal lesions and ovarian endometriomas during the late secretory phase. Conclusion(s): The high proliferative activity and the persistence of ERs and PRs in the stroma of red lesions and ovarian endometriomas emphasize the primordial role of the stroma in the development of endometriosis and suggest different mechanisms of proliferation control from those observed in eutopic endometrium. [less ▲]

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See detailDetermination of radiative lifetimes of neutral sulphur by time-resolved three-photon VUV laser spectroscopy
Berzinsh, U.; Caiyan, L.; Zerne, R. et al

in Physical Review. A : General Physics (1997), 55

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See detailRadiation therapy duration influences overall survival in patients with cervix carcinoma.
Coucke, Philippe ULg; Delaloye, J-F; Pampallona, S et al

in International Journal of Gynecology & Obstetrics (1997), 57

of the cervix treated by radical radiation therapy. Method; Three hundred and sixty patients with FIG0 stage IB-IIIB carcinoma of the cervix were treated in Lausanne (Switzerland) with external radiation ... [more ▼]

of the cervix treated by radical radiation therapy. Method; Three hundred and sixty patients with FIG0 stage IB-IIIB carcinoma of the cervix were treated in Lausanne (Switzerland) with external radiation and brachytherapy as first line therapy. Median therapy duration was 45 days. Patients were classified according to the duration of the therapies, taking 60 days (the 75th percentile) as an arbitrary cut-off. Results: The 5-year survival was 61% (SE. = 3%) for the therapy duration group of less than 60 days and 53% (SE. = 7%) for the group of more than 60 days. In terms of univariate hazard ratio (HR), the relative difference between the hvo groups corresponds to a 50% increase of deaths (HR = 1.53, 95% CI = 1.03-2.28) for the longer therapy duration group (P = 0.044). In a multivariate analysis, the magnitude of estimated relative hazards for the longer therapies are confirmed though significance was reduced (HR = 1.52, 95% CI = 0.94-2.45, P = 0.084). Conclusion: These findings suggesthat short treatment duration is a factor associated with longer survival in carcinoma of the cervix. 0 1997 International Federation of Gynecology and Obstetrics [less ▲]

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See detailFluidothérapie parentérale pratique chez les bovins
Rollin, Frédéric ULg

in Annales de Médecine Vétérinaire (1997), 141(2), 89-111

After setting up the main indications for parenteral fluid therapy in calves and adult cattle, the means are studied to practically evaluate on the field the dehydration, acid-base status, electrolyte ... [more ▼]

After setting up the main indications for parenteral fluid therapy in calves and adult cattle, the means are studied to practically evaluate on the field the dehydration, acid-base status, electrolyte disturbances and glycemia. The various classes of fluids are then considered as a function of the indications. Use of transfusion, hypertonic solutions and parenteral nutrition is broached. Routes and techniques of fluid administration are detailed. Obstacles encountered by the bovine practitioner when using parenteral fluid therapy are emphasized just as the means to overcome them. In this regard, it is described how to correctly prepare fluids for suited parenteral use in cattle. In fact, the present laws do not given this allowance to the practitioners. However, in most cases, it constitutes the only economical option avoiding worthless sufferings and death of the animal. [less ▲]

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See detailAdjusting to changes in the time of reinforcement: peak-interval transitions in rats.
Lejeune, H.; Ferrara, André ULg; Simons, F. et al

in Journal of Experimental Psychology. Animal Behavior Processes (1997), 23(2), 211-31

Thirty rats received training on a peak-interval procedure, where a baseline with a 20-s time of reinforcement was interspersed among cyclic transitions to other reinforcement time values (10, 20, 30, or ... [more ▼]

Thirty rats received training on a peak-interval procedure, where a baseline with a 20-s time of reinforcement was interspersed among cyclic transitions to other reinforcement time values (10, 20, 30, or 40 s), each of which was either in force for only a single session or for 3 sessions. Peak times were close to the time of reinforcement on the 20-s baseline and tracked the new reinforcement times both closely (but not exactly) and very rapidly. Peak time during transitions was affected by the criterion value in force on the previous session, exhibiting a proactive interference effect. Analysis of individual peak times during a session showed that transitions from lower to higher reinforcement time values were usually characterized by abrupt jumps in peak time, whereas descending transitions were mostly smooth but rapid. [less ▲]

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See detailProductivity and Convergence in OECD Service Industries
Gouyette, Claudine; Perelman, Sergio ULg

in Structural Change and Economic Dynamics (1997), 8

The objective of this paper is threefold. First, to estimate the productivity performances realized in service and manufacturing industries by 13 OECD countries over the period 1970-1987. Secondly, to ... [more ▼]

The objective of this paper is threefold. First, to estimate the productivity performances realized in service and manufacturing industries by 13 OECD countries over the period 1970-1987. Secondly, to compare the productivity indicators computed under the alternative frontier analysis and Divisia index approaches. Thirdly, to test the convergence phenomenon in both industries, focusing on the catching-up process and on the interaction between productivity changes and capital intensity variations. The main results show that, contrary to the manufacturing sector and in spite of very low growth rates, productivity levels converge in services. Moreover, new investments in capital appear to exert an unexpected depressive effect on total factor productivity growth in service activities, while having a positive influence in manufacturing industries. [less ▲]

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See detailGalectin-3 and laminin expression in neoplastic and non-neoplastic thyroid tissue.
Fernandez, P. L.; Merino, M. J.; Gomez, M. et al

in Journal of Pathology (The) (1997), 181(1), 80-6

Galectin-3 is a 31 kD beta-galactoside-binding lectin which is expressed by several types of non-neoplastic and neoplastic cells and which may be involved in cell-extracellular matrix interactions. An ... [more ▼]

Galectin-3 is a 31 kD beta-galactoside-binding lectin which is expressed by several types of non-neoplastic and neoplastic cells and which may be involved in cell-extracellular matrix interactions. An immunohistochemical study has been made of the expression of galectin-3, as well as its ligand, laminin, in a spectrum of benign and malignant thyroid neoplasms and in some non-neoplastic conditions. Immunohistochemistry with anti-human recombinant galectin-3 antibody showed consistent, intense positivity in the neoplastic cells of 18 cases of papillary carcinoma and less intense staining in the five anaplastic carcinomas studied. In addition, two out of three poorly differentiated carcinomas, three out of six medullary carcinomas, and four out of eight follicular carcinomas had less intense or focal positivity. One case of Hurthle cell carcinoma showed scattered strongly positive cells. Eight follicular adenomas, three hyperplastic nodules, five nodular goitres, and normal thyroid tissue were negative. Galectin-3 mRNA expression was also evaluated in three of the papillary carcinomas, two follicular adenomas, and one hyperplastic nodule with matched normal tissue. Northern blot analysis demonstrated mRNA overexpression in the three cases of papillary carcinomas, whereas normal and benign tissues were negative. Laminin distribution in neoplastic and non-neoplastic tissue varied with architectural patterns but did not correlate with galectin-3 immunohistochemical expression. We conclude that expression of galectin-3 is limited to inflammatory foci in normal and benign thyroid tissue and is a phenotypic feature of malignant thyroid neoplasms, especially papillary carcinomas. [less ▲]

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See detailSynthesis and biological evaluation of sulfonylcyanoguanidines and sulfonamidonitroethylenes as bioisosteres of hypoglycemic sulfonylureas
Masereel, B.; Ouedraogo, R.; Dogne, J.-M. et al

in European Journal of Medicinal Chemistry (1997), 32

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See detailJL 13, a pyridobenzoxazepine compound with potential atypical antipsychotic activity: a review of its behavioral properties
Bruhwyler, J.; Liégeois, Jean-François ULg; Bergman, J. et al

in Pharmacological Research (1997), 36

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See detailFungal contamination in barley and Kashin-Beck disease in Tibet
Chasseur, Camille; Suetens, Carl; Nolard, Nicole et al

in Lancet (1997), 350

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See detailMétastases ganglionnaires, hépatiques et osseuses d'un chemodectome carotidien. A propos d'un cas
DEFRAIGNE, Jean ULg; Limet, Raymond ULg

in Journal de Chirurgie (1997), 134(7-8), 336-9

A case of malignant carotid body tumor with nodal, hepatic and bone metastases is reported. Carotid body chemodectomas are slow-growing tumors which invade local structures. These tumors are usually ... [more ▼]

A case of malignant carotid body tumor with nodal, hepatic and bone metastases is reported. Carotid body chemodectomas are slow-growing tumors which invade local structures. These tumors are usually benign but can occasionally produce local and distant metastases. Development of metastatic localizations is the only formal proof of malignancy as histology cannot distinguish between benign and malignant chemodectomas. Bilateral carotid arteriography gives the diagnosis. Surgery is the basis of treatment and should be performed early in the course to limit operative complications. Radiotherapy can be given as adjuvant treatment. [less ▲]

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See detailLa problématique de la matière grasse : aspects théoriques
Thonart, Philippe ULg; Destain, Jacqueline ULg; Antoine, P. et al

in Tribune de l'Eau (La) (1997), 586/2

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See detailFormation of long-wavelength chlorophyllide (Chlide695) is required for the assembly of Photosystem II in etiolated barley leaves
Franck, Fabrice ULg; Eullaffroy, P.; Popovic, R.

in Photosynthesis Research (1997), 51(2), 107-118

Chlorophyll(ide) spectroscopic properties and Photosystem II assembly, monitored by 77 K variable fluorescence, were studied in etiolated barley leaves as a function of the extent of protochlorophyllide ... [more ▼]

Chlorophyll(ide) spectroscopic properties and Photosystem II assembly, monitored by 77 K variable fluorescence, were studied in etiolated barley leaves as a function of the extent of protochlorophyllide photoreduction by a single millisecond light flash of different intensities. Variable fluorescence, measured 2 hours after the flash, was only detected when the extent of phototransformation was higher than a threshold value of 0.4. Its development paralleled the formation of a chlorophyll emission component at 685 nm, which itself derived from long-wavelength chlorophyllide with an emission maximum at 695 nm. At low flash intensities, short-wavelength chlorophyllide forms preferentially accumulated and no Photosystem II fluorescence was detected after 2 hours. Chlorophyllide esterification was independent of the extent of phototransformation. These results suggested that the formation of long-wavelength chlorophyllide was essential for further assembly of Photosystem II. This interpretation was strengthened by the observed inhibition of both long-wavelength chlorophyllide formation and of variable fluorescence development in leaves treated with 6-aminolevulinic acid or in untreated leaves subjected to repeated flashes of low intensity. [less ▲]

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See detailThe role of endosome destabilizing activity in the gene transfer process mediated by cationic lipids.
El Ouahabi, A.; Thiry, Marc ULg; Pector, V. et al

in FEBS Letters (1997), 414(2), 187-92

We used a 32P-labeled pCMV-CAT plasmid DNA to estimate the DNA uptake efficiency and unlabeled pCMV-CAT plasmid DNA to quantify the CAT activity after transfection of COS cells using each of the three ... [more ▼]

We used a 32P-labeled pCMV-CAT plasmid DNA to estimate the DNA uptake efficiency and unlabeled pCMV-CAT plasmid DNA to quantify the CAT activity after transfection of COS cells using each of the three following cationic compounds: [1] vectamidine (3-tetradecylamino-N-tert-butyl-N'-tetradecylpropionamidine, and previously described as diC14-amidine [1]), [2] lipofectin (a 1:1 mixture of N-(1-2,3-dioleyloxypropyl)-N,N,N-triethylammonium (DOTMA) and dioleylphosphatidylethanolamine (DOPE)), and [3] DMRIE-C (a 1:1 mixture of N-[1-(2,3-dimyristyloxy)propyl]-N,N-dimethyl-N-(2-hydroxyethyl) ammonium bromide (DMRIE) and cholesterol). Surprisingly, a high CAT activity was observed with vectamidine although the DNA uptake efficiency was lower as compared to lipofectin and DMRIE-C. Transmission electron microscopy (TEM) revealed endocytosis as the major pathway of DNA-cationic lipid complex entry into COS cells for the three cationic lipids. However, the endosomal membrane in contact with complexes containing vectamidine or DMRIE-C often exhibited a disrupted morphology. This disruption of endosomes was much less frequently observed with the DNA-lipofectin complexes. This comparison of the three compounds demonstrate that efficient transfection mediated by cationic lipids is not only correlated to their percentage of uptake but also to their ability to destabilize and escape from endosomes. [less ▲]

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See detailSpecies assemblages and indicator species: The need for a flexible asymmetrical approach
Dufrêne, Marc ULg; Legendre, P.

in Ecological Monographs (1997), 67(3), 345-366

This paper presents a new and simple method to find indicator species and species assemblages characterizing groups of sites. The novelty of our approach lies in the way we combine a species relative ... [more ▼]

This paper presents a new and simple method to find indicator species and species assemblages characterizing groups of sites. The novelty of our approach lies in the way we combine a species relative abundance with its relative frequency of occurrence in the various groups of sites. This index is maximum when all individuals of a species are found in a single group of sites and when the species occurs in all sites of that group; it is a symmetric indicator. The statistical significance of the species indicator values is evaluated using a randomization procedure. Contrary to TWINSPAN, our indicator index for a given species is independent of the other species relative abundances, and there is no need to use pseudospecies. The new method identifies indicator species for typologies of species releves obtained by any hierarchical or nonhierarchical classification procedure; its use is independent of the classification method. Because indicator species give ecological meaning to groups of sites, this method provides criteria to compare typologies, to identify where to stop dividing clusters into subsets, and to point out the main levels in a hierarchical classification of sites. Species can be grouped on the basis of their indicator values for each clustering level, the heterogeneous nature of species assemblages observed in any one site being well preserved. Such assemblages are usually a mixture of eurytopic (higher level) and stenotopic species (characteristic of lower level clusters). The species assemblage approach demonstrates the importance of the 'sampled patch size,' i.e., the diversity of sampled ecological combinations, when we compare the frequencies of core and Satellite species. A new way to present species-site tables, accounting for the hierarchical relationships among species, is proposed. A large data set of carabid beetle distributions in open habitats of Belgium is used as a case study to illustrate the new method. [less ▲]

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See detailUn cas de néoténie dans un bâtiment désaffecté, chez le Triton alpestre, Triturus alpestris apuanus (Salamandridae)
Denoël, Mathieu ULg

in Alytes (1997), 15

A population of Triturus alpestris apuanus of the Apuane Alps (Tuscany , Italy) was studied during July 1994. The particularity of this population is that it breeds in an artificial site, in the dark and ... [more ▼]

A population of Triturus alpestris apuanus of the Apuane Alps (Tuscany , Italy) was studied during July 1994. The particularity of this population is that it breeds in an artificial site, in the dark and under cover, in a deserted building. Moreover some neotenic newts were discovered. The recent colonization and the instability of this biotope indicate a form of labile neoteny, appearing and disappearing spontaneously. [less ▲]

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See detailRheological characterization on the BaTiO3 sol-gel transition
Van Cantfort, Olivier; Brasseur, Alain; Michaux, Bernard et al

in Faraday Discussions (1997), 101

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See detailEuroback : Goals and achievement after one year
Jérome, Simone; Thirion, Paul ULg

in Serials Review (1997), 23(1), 53-56

EUROBACK is but a European clone of BackServ. It was launched because those who conceived it had a positive experience with the American-based electronic list. This article will explore why EUROBACK is ... [more ▼]

EUROBACK is but a European clone of BackServ. It was launched because those who conceived it had a positive experience with the American-based electronic list. This article will explore why EUROBACK is necessary as a separate list, and it will compare librarianship on the North American and European continents, where library materials are viewed quite differently. [less ▲]

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See detailTextural properties and thermal stability of silica-zirconia aerogels
Pirard, René ULg; Bonhomme, Damien; Kolibos, Sofia et al

in Journal of Sol-Gel Science and Technology (1997), 8

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See detailEffects of meloxicam compared to acetylsalicylic acid in human articular chondrocytes
Bassleer, Corinne; Magotteaux, Jacques ULg; Geenen, Vincent ULg et al

in Pharmacology (1997), 54

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See detailIntegrator forwarding : a new recursive nonlinear robust design
Sepulchre, Rodolphe ULg; Jankovic, M.; Kokotovic, Petar V.

in Automatica (1997), 33(5), 979-984

We consider the global stabilization of nonlinear systems in strict feedforward form. We show that these systems, while not feedback linearizable, can be (globally) transformed by feedback and ... [more ▼]

We consider the global stabilization of nonlinear systems in strict feedforward form. We show that these systems, while not feedback linearizable, can be (globally) transformed by feedback and diffeomorphism into a lower-triangular form. The transformation is explicit and recursive. We employ this transformation to design a globally stabilizing controller with optimality properties and an input-to-state stability property with respect to matched uncertainties. [less ▲]

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See detailMulti-Cité, une expérience de formation initiale inédite
Beckers, Jacqueline ULg; Stegen, Pierre; Merenne-Schoumaker, Bernadette ULg et al

in Puzzle (1997), 2(juin), 10-16

L'article présente l'expérience de formation co-jointe de futurs professeurs de géographie de l'ULg et de la Haute Ecole Charlemagne via la réalisation d'un jeu pédagogique portant sur la gestion urbaine ... [more ▼]

L'article présente l'expérience de formation co-jointe de futurs professeurs de géographie de l'ULg et de la Haute Ecole Charlemagne via la réalisation d'un jeu pédagogique portant sur la gestion urbaine, jeu publié dans GEO 41. [less ▲]

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See detailcompte rendu de : J. Martinez-Pinna, Tarquinio Prisco. Ensayo historico sobre Roma arcaica
Rochette, Bruno ULg

in Etudes Classiques (Namur, Belgium) (1997), (3), 280

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See detailSynthesis and characterization of monodisperse spherical zirconia particles
Van Cantfort, Olivier; Michaux, Bernard; Pirard, René ULg et al

in Journal of Sol-Gel Science and Technology (1997), 8

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See detailBeam-laser measurements and relativistic Hartree-Fock calculations of the lifetimes of the 3d94p levels in Cu II
Pinnington, E. H.; Rieger, G.; Kernahan, J. A. et al

in Canadian Journal of Physics (1997), 75

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See detailManifestations indésirables des antidépresseurs
Charlier, Corinne ULg; Ansseau, Marc ULg; Pinto, Emmanuel ULg et al

in Toxicorama (1997), (Spécial LYON), 310-314

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See detailCompte rendu de L.C. Youtie, P. Michigan 17. The Michigan Medical Codex (P. Mich. 758 = P. Mich. inv. 21), Atlanta, 1996 (American Studies in Papyrology, 35)
Marganne, Marie-Hélène ULg

in Chronique d'Egypte : Bulletin Périodique de la Fondation Egyptologique Reine Elisabeth (1997), 72

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See detailRoom temperature fluorescence spectra of protochlorophyllide and chlorophyllide forms in etiolated bean leaves
Boddi, B.; Franck, Fabrice ULg

in Journal of Photochemistry and Photobiology B : Biology (1997), 41(1-2), 73-82

Room-temperature fluorescence emission and excitation spectra of 3-day or 10-day old dark-grown bean (Phaseolus vulgaris L. cv Commodore) leaves were measured. The excitation light was defocused in such ... [more ▼]

Room-temperature fluorescence emission and excitation spectra of 3-day or 10-day old dark-grown bean (Phaseolus vulgaris L. cv Commodore) leaves were measured. The excitation light was defocused in such way that only a low rate of phototransformation took place and protochlorophyllide (Pchlide) forms could be detected. The spectra were resolved into gaussian components using a new method based on the comparison of the 4th derivative of the experimental spectrum and that of the calculated spectrum, i.e. the sum of the gaussians. In addition to Pchlide emission bands with maxima at 631, 644, 655 and 667 nm which correspond to those described earlier in 77 K spectra, two new and unusally narrow bands were found at 637 and 650 nm. Tn the Chlide region, emission bands were found at 676, 682, 686 and 695 nm. Changes in the relative amplitudes of the Pchlide and Chlide room temperature emission bands as a function of age, of excitation wavelength and in response to a short light flash were studied. A model is given in which dynamic interconversions of the pigment forms are suggested and the presence of the new forms is explained with the differences in the aggregational states of the pigments and with their interaction with NADPH or NADP(+). (C) 1997 Elsevier Science S.A. [less ▲]

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See detailConcordanze del «Canto novo» di Gabriele d’Annunzio.
Moreno, Paola ULg

in Revue Belge de Philologie et d'Histoire (1997)

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See detailHypochlorous acid activates NF-kappaB transcription factor in T lymphocytes
Schoonbroodt, Sonia; Legrand-Poels, Sylvie ULg; Best-Belpomme, Martin et al

in Biochemical Journal (1997)

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See detailLe cas clinique du mois, A propos d'un cas de myelinolyse centropontique chez un éthylique chronique
Lebrun, F.; Lambermont, Bernard ULg; Ghuysen, Alexandre ULg et al

in Revue Médicale de Liège (1997), 52(1), 7-11

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See detailcDNA cloning and expression of bovine procollagen I N-proteinase: a new member of the superfamily of zinc-metalloproteinases with binding sites for cells and other matrix components.
Colige, Alain ULg; Li, S. W.; Sieron, A. L. et al

in Proceedings of the National Academy of Sciences of the United States of America (1997), 94(6), 2374-9

Procollagen N-proteinase (EC 3.4.24.14) cleaves the amino-propeptides in the processing of type I and type II procollagens to collagens. Deficiencies of the enzyme cause dermatosparaxis in cattle and ... [more ▼]

Procollagen N-proteinase (EC 3.4.24.14) cleaves the amino-propeptides in the processing of type I and type II procollagens to collagens. Deficiencies of the enzyme cause dermatosparaxis in cattle and sheep, and they cause type VIIC Ehlers-Danlos syndrome in humans, heritable disorders characterized by accumulation of pNcollagen and severe skin fragility. Amino acid sequences for the N-proteinase were used to obtain cDNAs from bovine skin. Three overlapping cDNAs had an ORF coding for a protein of 1205 residues. Mammalian cells stably transfected with a complete cDNA secreted an active recombinant enzyme that specifically cleaved type I procollagen. The protein contained zinc-binding sequences of the clan MB of metallopeptidases that includes procollagen C-proteinase/BMP-1. The protein also contained four repeats that are homologous to domains found in thrombospondins and in properdin and that can participate in complex intermolecular interactions such as activation of latent forms of transforming growth factor beta or the binding to sulfatides. Therefore, the enzyme may play a role in development that is independent of its role in collagen biosynthesis. This hypothesis was supported by the observation that in some tissues the levels of mRNA for the enzyme are disproportionately high relative to the apparent rate of collagen biosynthesis. [less ▲]

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See detailSm-Nd signature of modern and late Quaternary sediments from the northwest North Atlantic: Implications for deep current changes since the Last Glacial Maximum
Innocent, C.; Fagel, Nathalie ULg; Stevenson, Ross et al

in Earth & Planetary Science Letters (1997), 146(3-4), 607-625

Nd isotopes and Sm-Nd concentrations have been investigated in the clay size fraction of surface and late Quaternary sediments of the northern North Atlantic. Four sources of Nd have been identified in ... [more ▼]

Nd isotopes and Sm-Nd concentrations have been investigated in the clay size fraction of surface and late Quaternary sediments of the northern North Atlantic. Four sources of Nd have been identified in the surface sediments: (1) a radiogenic Nd typical of the Iceland volcanism; (2) a ''Pan-African'' Nd issued from eastern Greenland; (3) a ''Variscan'' Nd derived from the Arctic Ocean; (4) an old unradiogenic Nd related to the North American Shield, In the Iceland and Irminger basins, the major sources of Nd are the Variscan Nd derived from the Arctic Ocean and the Iceland Nd, except in the western Irminger Basin where the Pan-African Nd originating from eastern Greenland is dominant and labels sedimentary supplies linked to the Denmark Strait Overflow Water, Nd derived from Icelandic volcanism is never clearly dominant, even on the Reykjanes Ridge, and the Nd derived from the American Shield becomes dominant only in the Labrador Sea, Sediments lying in the pathway of the Western Boundary Undercurrent have Nd isotopic compositions which are shifted towards more radiogenic values indicating an input of material from the eastern basins, carried by this deep current. Late Quaternary sediments were cored from the southern Greenland Rise (core 90-013-013) and eastern Labrador Rise (Orphan Knell; core 91-045-094). In core 90-013-013, epsilon Nd values during the Last Glacial Maximum are as low as -20, but subsequently rose to -9 in the modern sediments, indicating that the sedimentary material during the Last Glacial Maximum was dominated by unradiogenic Nd from the North American Shield. This may be related to a lesser outflow of the Western Boundary Undercurrent, In core 91-045-094, located along the Labrador Current trajectory, a dominant supply of North American Shield Nd is recorded, perhaps originating at least partially from the Hudson Strait, The Sm-Nd data are compatible with smectite vs. illite studies at the same sites which suggest a continuous but more modest Western Boundary Undercurrent supply during Last Glacial Maximum. [less ▲]

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See detailThe yeast genome directory.
Goffeau, A.; Hilger, F.; Portetelle, Daniel ULg et al

in Nature (1997), 387(5),

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See detailSoil Solution Nitrogen and Cations Influenced by (NH4)2SO4 Deposition in a Coniferous Forest
Carnol, Monique ULg; Ineson, Phil; Dickinson, A. L.

in Environmental Pollution (1997), 97(1-2), 1-10

The effects of chronically enhanced (NH(4))(2)SO(4) deposition on ion concentrations in soil solution and ionic fluxes were investigated in a Picea abies plot at Grizedale forest, NW England. Soil cores ... [more ▼]

The effects of chronically enhanced (NH(4))(2)SO(4) deposition on ion concentrations in soil solution and ionic fluxes were investigated in a Picea abies plot at Grizedale forest, NW England. Soil cores closed at the base and containing a ceramic suction cup sampler were 'roofed' and watered every 2 weeks with bulk throughfall collected in the field. Treatments consisted of the inclusion of living roots from mature trees in the lysimeters and increasing (NH(4))(2)SO(4) deposition (NS treatment) to ambient + 75 kg N ha(-1) a(-1). Rainfall, throughfall and soil solutions were collected every 2 weeks during 18 months, and analysed for major cations and anions. NO(3)(-) fluxes significantly increased following NS treatment, and were balanced by increased Al(3+) losses. Increased SO(4)(2-) concentrations played a minor role in controlling soil solution cation concentrations. The soil exchange complex was dominated by Al and, during the experimental period, cores of all treatments 'switched' from Ca(2+) to Al(3+) leaching, leading to mean [Formula: see text] molar ratios in soil solution of NS treated cores of 0.24. The experiment confirmed that the most sensitive soils to acidification (through deposition or changing environmental conditions) are those with low base saturation, and with a pH in the lower Ca, or Al buffer ranges. [less ▲]

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See detailPhysical activity, obesity, and cardiovascular risk factors in children. The Belgian Luxembourg Child Study II.
Guillaume, Michèle ULg; Lapidus, L.; Bjondorp, P. et al

in Obesity Research (1997), 5(6), 549-56

Physical activity was measured in relation to cardiovascular (CV) risk factors in a randomly selected population of 1028 children from Province de Luxembourg in Belgium, a mainly rural area with a high ... [more ▼]

Physical activity was measured in relation to cardiovascular (CV) risk factors in a randomly selected population of 1028 children from Province de Luxembourg in Belgium, a mainly rural area with a high prevalence of such risk factors among adults and children. Physical activity was estimated as participation in sport activities, a major indicator of leisure-time physical activity in schoolchildren, and physical inactivity was estimated as frequency and duration of television (TV) watching. Boys participated more frequently in sport activities than girls did (p = 0.001). A majority of the children watched TV daily. After age adjustment, bodyweight (girls, p < 0.012; boys, p < 0.027) and, in boys, body mass index (BMI) (p < 0.039) were related to days per week of TV watching. No significant relationships with other CV risk factors remained after adjustments for BMI. In analyses of independent contributions of age, TV watching, and sports activity on CV risk factors, age showed highly significant relationships. In boys, TV showed relationships with BMI (p < 0.04) and (borderline) with systolic blood pressure, independent of age and sports activity, whereas the latter was significantly related to subscapular skinfold (p < 0.04) and (borderline) with triceps skinfold and cholesterol. In girls, no significant independent contributions to risk factor associations were found. The father's education was directly associated with sports activities, whereas the mother being a housewife showed negative relationships to physical activity and positive to TV watching in their children, suggesting socioeconomic influence on the activity patterns of children. Furthermore, registrations suggested less physical activity in the most rural part of the area. It is concluded that children in this mainly rural area watch TV frequently. In boys, physical inactivity, measured both as TV watching and as registrations of sports activities, contributes independently to body fat mass. In girls, no contribution or weaker contributions of physical inactivity were found. This suggests that contributory factors leading to obesity might be different in girls and boys. [less ▲]

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See detailInduction of membrane-type matrix metalloproteinase 1 (MT1-MMP) expression in human fibroblasts by breast adenocarcinoma cells.
Polette, M.; Gilles, Christine ULg; Marchand, V. et al

in Clinical & Experimental Metastasis (1997), 15(2), 157-63

Membrane-type matrix metalloproteinase 1 (MT1-MMP) has been recently described as an activator of proMMP-2 (MMP-2) which is involved in tumor invasion. We have shown by in situ hybridization that MT1-MMP ... [more ▼]

Membrane-type matrix metalloproteinase 1 (MT1-MMP) has been recently described as an activator of proMMP-2 (MMP-2) which is involved in tumor invasion. We have shown by in situ hybridization that MT1-MMP is produced by stromal cells in close contact to preinvasive and invasive tumor cells of breast carcinomas. Of particular interest was the observation that some fibroblasts express this enzyme in focal areas in preinvasive lesions, suggesting that particular tumor cells may stimulate fibroblasts to produce MT1-MMP. We have therefore compared the ability of two different breast cancer cell lines, one non-invasive (MCF7) and one invasive (MDA-MB-231) to stimulate MT1-MMP production in human fibroblasts with consequent proMMP-2-activation. The MDA-MB-231 conditioned medium induced MT1-MMP mRNAs in human fibroblasts and a parallel activation of proMMP-2 whereas MCF7 conditioned medium did not have any effect. These results suggest the existence of soluble factor(s) secreted by invasive or some preinvasive breast tumor cells which stimulate fibroblasts to produce and activate MMPs, and emphasize the cooperation between cancer and stromal cells in tumor invasion. [less ▲]

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See detailGluonic content of the scalar meson nonet in a scaled effective Lagrangian
Jaminon, Martine ULg; Van den Bossche, Bruno

in Nuclear Physics A (1997), 619

A scaled SU(3) Nambu-Jona-Lasinio Lagrangian is used to compute the mass of the nine scalar mesons in the vacuum and the mass of the glueball. This chiral model provides a gluonic content to the scalar ... [more ▼]

A scaled SU(3) Nambu-Jona-Lasinio Lagrangian is used to compute the mass of the nine scalar mesons in the vacuum and the mass of the glueball. This chiral model provides a gluonic content to the scalar mesons as well as a quark content to the glueball. It is shown that a suitable choice of the vacuum gluon condensate allows reproduction of the experimental masses of the scalar mesons except for K*0(1430). This choice corresponds to a weak coupling between the gluon and quark condensates, giving f0(1500) or fJ(1710) which is nearly a pure glueball. [less ▲]

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See detailEngraissement du taurillon Blanc-Bleu belge
Minet, Vincent; Van Eenaeme, Christian ULg; Raskin, Pascale et al

in Agricontact (1997), 291

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