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See detailThe use of mathematical symbolism in problem solving : an empirical study carried out in grade one in the French Community of Belgium
Fagnant, Annick ULg

in European Journal of Psychology of Education (2005), XX(4), 355-367

This article relates to an empirical study based on the use of mathematical symbolism in problem solving. Twenty-five pupils were interviewed individually at the end of grade one; each of them was asked ... [more ▼]

This article relates to an empirical study based on the use of mathematical symbolism in problem solving. Twenty-five pupils were interviewed individually at the end of grade one; each of them was asked to solve and symbolize 14 different problems. In their classical curriculum, these pupils have received a traditional education based on a "top-down" approach (an approach that is still applied within the French Community of Belgium): conventional symbols are presented to the pupils immediately with an explanation of what they represent and how they should be used. Teaching then focuses on calculation techniques (considered as a pre-requisite for solving problems). The results presented here show the abilities (and difficulties) demonstrated by the children in making connections between the conventional symbolism taught in class and the informal approaches they develop when faced with the problems that arc, put to them. The limits of the "top-down" approach are then discussed as opposed to the more innovative "bottom-up" type approaches, such as those developed by supporters of Realistic Mathematics Educations in particular. [less ▲]

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See detailExigences physiologiques necessaires a la pratique de la gymnastique de haut niveau
Lange, B.; Halkin, Anne-Sophie ULg; Bury, Thierry ULg

in Revue Médicale de Liège (2005), 60(12), 939-45

The evolution of the physiological profile of gymnasts over the past 40 years is outlined. Generally, gymnasts have a low aerobic aptitude in spite of an increase in the number of training hours. During ... [more ▼]

The evolution of the physiological profile of gymnasts over the past 40 years is outlined. Generally, gymnasts have a low aerobic aptitude in spite of an increase in the number of training hours. During the last decades, anaerobic power of gymnasts has increased. And now, the maximal power output measured by the Wingate test in high level male gymnasts is between 12 and 14 W.Kg-1 and in female gymnasts between 10 and 12 W.Kg-1. Measurement of higher blood lactate values also confirms that the anaerobic capacity has increased. [less ▲]

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See detailHepatitis C virus genotype 5 in southern Belgium: Epidemiological characteristics and response to therapy
Delwaide, Jean ULg; Gerard, Christiane ULg; Reenaers, Catherine ULg et al

in Digestive Diseases & Sciences (2005), 50(12), 2348-2351

Data are scarce on patients infected with hepatitis C virus of genotype 5, due to the low prevalence of this genotype around the world. To better define the characteristics of these patients, we reviewed ... [more ▼]

Data are scarce on patients infected with hepatitis C virus of genotype 5, due to the low prevalence of this genotype around the world. To better define the characteristics of these patients, we reviewed the files of 16 genotype 5 patients. Mean age was 38 +/- 14. All patients were of European origin. Most of them (75%) had been contaminated by transfusion within a short time period (between 1980 and 1991). There were no intravenous drug addicts. Seven patients received treatment. One patient did not respond to interferon (IFN) monotherapy. Of four patients treated with IFN and ribavirin, three became sustained viral responders. Two patients treated with pegylated IFN and ribavirin became sustained viral responders. In our region, genotype 5 patients seem to have been contaminated within a relatively short time period. Treatment with IFN or pegylated IFN and ribavirin gave a high rate (83%) of sustained viral responses. [less ▲]

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See detailTuareg ethnodiagnostic skill of camel diseases in Agadez area (Niger)
Antoine-Moussiaux, Nicolas ULg; Faye, Bernard; Vias, Gilles F.

in Journal of Camel Practice and Research (2005), 12(2), 85-93

For generations, nomad herders have been learning to manage herd health, particularly in dromedary because of its high value. They have thus acquired a very comprehensive knowledge of camel's illness ... [more ▼]

For generations, nomad herders have been learning to manage herd health, particularly in dromedary because of its high value. They have thus acquired a very comprehensive knowledge of camel's illness signs and have developed their own nomenclature. The present study aims at the description, scientific identification and recognition of this ethnoveterinary knowledge by means of an investigation carried out in Tuareg populations living in the neighbourhoods of Agadez (Niger). The dominant pathologies cited by herders for being the most alarming are gastro-intestinal helminthiasis (izni), camel calf diarrhoea (efay), tick infestations of camel calves (igardan), camel pox (erk eshik), sarcoptic mange (ajud) and bronchopneumonia (toza). Poorly identified nosologic entities are also reported. [less ▲]

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See detailLa langue française face aux langues de l’immigration – Etat des lieux en Communauté française de Belgique
Martiniello, Marco ULg; Perrin, N.

Scientific conference (2005, November 30)

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See detailCocaine-conditioned activity persists for a longer time than cocaine-sensitized activity in mice: Implications for the theories using Pavlovian excitatory conditioning to explain the context-specificity of sensitization
Tirelli, Ezio ULg; Michel, Alexa ULg; Brabant, Christian ULg

in Behavioural Brain Research (2005), 165(1), 18-25

The present study was aimed at testing the prediction of the Pavlovian excitatory conditioning explanation of context-specific sensitization that the sensitized effect (SE) should persist as long as the ... [more ▼]

The present study was aimed at testing the prediction of the Pavlovian excitatory conditioning explanation of context-specific sensitization that the sensitized effect (SE) should persist as long as the post-sensitization conditioned activity (CR). C57BL/6J mice were tested for the expression of cocaine-induced conditioned and sensitized locomotion on several intervals after the establishment of a sensitization in an unchanging context. A group of mice received 10 once-daily injections of 10 mg/kg cocaine (s.c.) in a short time prior to being tested in activity-meters for 60 min sessions (cocaine-pretreated group), mice from a control group receiving saline in the same manner (saline-pretreated group). On the test sessions, taking place 1, 8 and 28 days after cocaine pretreatment, half of the animals of each pretreatment group (n=8) received a challenge test with saline and the other half with 10 mg/kg cocaine in the pretreatment context room (for CR and SE tests, respectively). The CR was significantly expressed on the three successive saline-challenge tests, albeit the activity levels were markedly decreased on the 28-day retention test. In contrast, the SE was significantly expressed only during the first half of the 1-day test session and the first 10 min of the 8-day test session, no SE effect being expressed on the 28-day retention test. The results, suggesting a functional uncoupling of the CR from the SE, disprove the theories of context-specificity of sensitization based completely or partially on Pavlovian excitatory conditioning mechanisms. [less ▲]

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See detailImpact of acid containing montmorillonite on the properties of Nafion® membranes
Thomassin, Jean-Michel ULg; Pagnoulle, Christophe; Caldarella, Giuseppe ULg et al

in Polymer (2005), 46(25), 11389-11395

The counter-ions of montmorillonite have been exchanged for ammonium cations containing either a sulfonic acid or a carboxylic acid in order to improve the performances of sulfonated membranes in direct ... [more ▼]

The counter-ions of montmorillonite have been exchanged for ammonium cations containing either a sulfonic acid or a carboxylic acid in order to improve the performances of sulfonated membranes in direct methanol fuel cell. These layered silicates have been dispersed within Nafion® by solution mixing. Comparison with conventional organo-modified montmorillonite (Cloisite 30B) shows that the incorporation of carboxylic acid in the clay galleries improves the filler dispersion and, consequently, the methanol barrier properties. Moreover, the negative impact of Cloisite 30B on the ionic conductivity is restricted. [less ▲]

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See detailLe traitement clinique du chômage
Orianne, Jean-François ULg

Doctoral thesis (2005)

Cette thèse prend pour objet une politique publique : la politique du Parcours d’insertion. Menée dans les différents Etats membres de l’Union depuis le milieu des années 1990, au nom d’une meilleure ... [more ▼]

Cette thèse prend pour objet une politique publique : la politique du Parcours d’insertion. Menée dans les différents Etats membres de l’Union depuis le milieu des années 1990, au nom d’une meilleure intégration et coordination des multiples actions destinées aux personnes en recherche d’emploi, cette politique « active » d’emploi vise le développement de l’employabilité des chômeurs, entendons par là leur capacité d’insertion socioprofessionnelle, leurs « chances » d’accéder à un emploi durable et de qualité. Nous procédons à l’analyse de cette politique publique sous l’angle, bien particulier, du travail quotidien de trois groupes d’intermédiaires publics du marché du travail chargés de mettre en œuvre cette politique en Région wallonne (Belgique), d’en traduire les énoncés en action sur autrui : les conseillers en accompagnement professionnel du FOREM, les conseillers en formation de Carrefour Formation, les travailleurs sociaux d’Entreprises de Formation par le Travail. L’analyse tend à montrer que l’action de ces intermédiaires oriente le traitement du chômage dans une voie clinique : l’action des intermédiaires publics du marché du travail, qui vise principalement à mettre le chômeur au travail sur lui-même, repose sur la construction professionnelle de « troubles » de l’employabilité. [less ▲]

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See detailSubacute effects of sertraline on attentional and executive functions in depression
Constant, Eric; Adam, Stéphane ULg; Gillain, B. et al

Conference (2005, November 26)

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See detailCancer parathyroïdien et immunothérapie
Beckers, Albert ULg

Scientific conference (2005, November 25)

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See detailStudy of the active site residues of a glycoside hydrolase family 8 xylanase
Collins, T.; De Vos, D.; Hoyoux, A. et al

in Journal of Molecular Biology (2005), 354(2), 425-435

Site-directed mutagenesis and a comparative characterisation of the kinetic parameters, pH dependency of activity and thermal stability of mutant and wild-type enzymes have been used in association with ... [more ▼]

Site-directed mutagenesis and a comparative characterisation of the kinetic parameters, pH dependency of activity and thermal stability of mutant and wild-type enzymes have been used in association with crystallographic analysis to delineate the functions of several active site residues in a novel glycoside hydrolase family 8 xylanase. Each of the residues investigated plays an essential role in this enzyme: E78 as the general acid, D281 as the general base and in orientating the nucleophilic water molecule, Y203 in maintaining the position of the nucleophilic water molecule and in structural integrity and D144 in sugar ring distortion and transition state stabilization. Interestingly, although crystal structure analyses and the pH-activity profiles clearly identify the functions of E78 and D281, substitution of these residues with their amide derivatives results in only a 250-fold and 700-fold reduction in their apparent k(cat) values, respectively. This, in addition to the observation that the proposed general base is not conserved in all glycoside hydrolase family 8 enzymes, indicates that the mechanistic architecture in this family of inverting enzymes is more complex than is conventionally believed and points to a diversity in the identity of the mechanistically important residues as well as in the arrangement of the intricate microenvironment of the active site among members of this family. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailThe Sounds of Rock Poetry and the Avant-Garde
Delville, Michel ULg

Conference (2005, November 25)

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See detailPTH : what are we really assaying ?
Cavalier, Etienne ULg

Conference (2005, November 25)

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See detailStudy of neuronal cells preconditionning
Guelluy, Pierre-Henri ULg; Mouithys-Mickalad, Ange ULg; Deby, Ginette et al

Poster (2005, November 25)

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See detailOptimisation de la spécificité d’encodage pour le diagnostic précoce de la maladie d’Alzheimer
Adam, Stéphane ULg; Van der Linden, Martial ULg; Ivanoiu, Adrian et al

Conference (2005, November 24)

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See detailRites et récits dans l'Etat hébreu : l'enfance du politique selon Spinoza
Herla, Anne ULg

Conference (2005, November 24)

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See detailValidation of models tropospheric excess path length for GNSS, based on ECMWF analysis products
Bonfond, Bertrand ULg; Martelucci, Antonio

Conference (2005, November 23)

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See detailSocially induced and rapid increases in aggression are inversely related to brain aromatase activity in a sex-changing fish, Lythrypnus dalli
Black, M. P.; Balthazart, Jacques ULg; Baillien, M. et al

in Proceedings of the Royal Society B : Biological Sciences (2005), 272(1579), 2435-2440

Social interactions can generate rapid and dramatic changes in behaviour and neuroendocrine activity. We investigated the effects of a changing social environment on aggressive behaviour and brain ... [more ▼]

Social interactions can generate rapid and dramatic changes in behaviour and neuroendocrine activity. We investigated the effects of a changing social environment on aggressive behaviour and brain aromatase activity (bAA) in a sex-changing fish, Lythrypnus dalli. Aromatase is responsible for the conversion of androgen into oestradiol. Male removal from a socially stable group resulted in rapid and dramatic (>= 200%) increases in aggression in the dominant female, which will become male usually 7-10 days later. These dominant females and recently sex-changed individuals had lower bAA but similar gonadal aromatase activity (gAA) compared to control females, while established males had lower bAA than all groups and lower gAA than all groups except dominant females. Within hours of male removal, dominant females' aggressive behaviour was inversely related to bAA but not gAA. These results are novel because they are the first to: (i) demonstrate socially induced decreases in bAA levels corresponding with increased aggression, (ii) identify this process as a possible neurochemical mechanism regulating the induction of behavioural, and subsequently gonadal, sex change and (iii) show differential regulation of bAA versus gAA resulting from social manipulations. Combined with other studies, this suggests that aromatase activity may modulate fast changes in vertebrate social behaviour. [less ▲]

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See detailLearning Reliability Models of Grid Resource Supplying
Briquet, Cyril ULg; de Marneffe, Pierre-Arnoul ULg

in Bubak, Marian; Turala, Michal; Wiatr, Kazimierz (Eds.) CGW'05 Proceedings (2005, November 22)

Resource exchange between Grid participants is at the core of Grid computing. Distributed bartering is a distributed and moneyless method of resource exchange. Recent work related to distributed bartering ... [more ▼]

Resource exchange between Grid participants is at the core of Grid computing. Distributed bartering is a distributed and moneyless method of resource exchange. Recent work related to distributed bartering has mainly dealt with resource supplying. However, Grid participants still face an unstable resource environment due to the partial and intermittent nature of the exchanged resources. The problem considered in this paper is the unreliability of resource supplying. Though it cannot be totally avoided, a proactive stance may lower its impact in the long run. We propose to explore the reduction of performance variability by improving resource consumption. The goal is to enable Grid participants to identify and avoid unreliable resource suppliers by learning reliability models of resource supplying. A Machine Learning problem is defined and the generated models are applied to select more reliable resources in the hope of improving resource consumption. [less ▲]

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