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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 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 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 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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See detailDoes insulin release kinins in rats?
Damas, Jacques ULg; Garbacki, Nancy ULg; Lefebvre, P. J.

in European Journal of Pharmacology (2005), 525(1-3), 154-160

Rat uterus maintained in situ was used as a bioassay of kinins possibly released in vivo by hyperglycaemia or insulin. Intravenous injections of bradykinin induced contractions of rat uterus which were ... [more ▼]

Rat uterus maintained in situ was used as a bioassay of kinins possibly released in vivo by hyperglycaemia or insulin. Intravenous injections of bradykinin induced contractions of rat uterus which were suppressed by HOE 140, a bradykinin B-2 receptor antagonist. Des-Arg(9)-bradykinin, a kinin B-1 receptor agonist, did not elicit any response. After propranolol, the effects of bradykinin were enhanced and dose-dependent. This potentiation did not appear in adrenalectomized rats. Captopril, an angiotensin-converting enzyme (ACE) inhibitor, largely increased the effects of bradykinin. In animals pretreated with propranolol, captopril and atosiban, an oxytocin antagonist, intravenous infusion of glucose induced hyperglycaemia and after a delay increased the uterine contractile activity. This contractile effect of glucose was abolished by HOE 140. Infusion of insulin with glucose induced contractions of the uterus. These responses did not appear or were suppressed by HOE 140 or by soya bean trypsin inhibitor (SBTI), a plasma kallikrein inhibitor. These results are direct evidence that insulin induces a release of kinins. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailIndividu et culture selon Hegel
Seba, Jean-Renaud ULg

Conference given outside the academic context (2005)

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See detailOpen flux estimates in Saturn's magnetosphere during the January 2004 Cassini-HST campaign, and implications for reconnection rates
Badman, S. V.; Bunce, E. J.; Clarke, J. T. et al

in Journal of Geophysical Research. Space Physics (2005), 110(A11),

During 8-30 January 2004, a sequence of 68 UV images of Saturn's southern aurora was obtained by the Hubble Space Telescope (HST), coordinated for the first time with measurements of the upstream ... [more ▼]

During 8-30 January 2004, a sequence of 68 UV images of Saturn's southern aurora was obtained by the Hubble Space Telescope (HST), coordinated for the first time with measurements of the upstream interplanetary conditions made by the Cassini spacecraft. Using the poleward edge of the observed aurora as a proxy for the open-closed field line boundary, the open flux content of the southern polar region has been estimated. It is found to range from similar to 15 to similar to 50 GWb during the interval, such a large variation providing evidence of a significant magnetospheric interaction with the solar wind, in particular with the interplanetary structures associated with corotating interaction regions (CIRs). The open flux is found to decline slowly during a rarefaction region in which the interplanetary magnetic field remained very weak, while decreasing sharply in association with the onset of CIR-related solar wind compressions. Such decreases are indicative of the dominating role of open flux closure in Saturn's tail during these intervals. Increases in open flux are found to occur in the higher-field compression regions after the onsets, and in a following rarefaction region of intermediate field strength. These increases are indicative of the dominating role of open flux production at Saturn's magnetopause during these intervals. The rate of open flux production has been estimated from the upstream interplanetary data using an empirical formula based on experience at Earth, with typical values varying from similar to 10 kV during the weak-field rarefaction region, to similar to 200 kV during the strong-field compression. These values have been integrated over time between individual HST image sets to estimate the total open flux produced during these intervals. Comparison with the changes in open flux obtained from the auroral images then allows us to estimate the amount of open flux closed during these intervals, and hence the averaged tail reconnection rates. Intermittent intervals of tail reconnection at rates of similar to 30-60 kV are inferred in rarefaction regions, while compression regions are characterised by rates of similar to 100-200 kV, these values representing averages over the similar to 2-day intervals between HST image sequences. [less ▲]

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See detailFar ultraviolet remote sensing of the isotropy boundary and magnetotail stretching
Blockx, Caroline ULg; Gérard, Jean-Claude ULg; Meurant, M. et al

in Journal of Geophysical Research. Space Physics (2005), 110(A11),

Several studies have attempted to identify the isotropy boundary (IB) defining the limit between the adiabatic and nonadiabatic trajectories of the trapped protons along closed magnetic field lines. This ... [more ▼]

Several studies have attempted to identify the isotropy boundary (IB) defining the limit between the adiabatic and nonadiabatic trajectories of the trapped protons along closed magnetic field lines. This boundary is an indicator of the amount of magnetic field line stretching in the magnetotail. Previous studies were based on in situ measurements, resulting in spatially and temporally restricted samples. To overcome these limitations, we propose to use global data obtained with the FUV spectrographic proton auroral imager (SI12) on board the IMAGE satellite. We determine at each magnetic local time the position of an optical boundary related to the IB and thereby to the stretching of the magnetic field lines. We show that the correspondence between the latitude of the maximum proton precipitation observed by SI12 and the IB measured by Defense Meteorological Satellite Program satellites is statistically established and depends on the magnetic local time. The relation between the position of the maximum proton precipitation as well as the intensity of this maximum and the magnetic field distortion is determined by comparison with GOES 8 data. We suggest that SI12 images can be used as a tool to globally determine the isotropy boundary and to monitor the level of stretching in the magnetotail. [less ▲]

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