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See detailTrophic diversity among amphipod crustaceans from Posidonia oceanica meadows : A stable isotope assessment
Michel, Loïc ULg; Lepoint, Gilles ULg; Gobert, Sylvie ULg et al

Conference (2008, October 31)

Vagile invertebrates are regarded as key-components of Posidonia oceanica meadow ecosystems, particularly in organic matter transfers from primary producers to higher level consumers. Among these ... [more ▼]

Vagile invertebrates are regarded as key-components of Posidonia oceanica meadow ecosystems, particularly in organic matter transfers from primary producers to higher level consumers. Among these invertebrates, amphipod crustaceans are one of the most abundant and diverse groups, and probably play an important role in meadow ecosystem functioning. However, their trophic ecology is poorly known, and these crustaceans are generally regarded as vegetal epiphytes consumers or generalist detritivores, due to the lack of accurate studies. Here, we focused on the study of the interspecific trophic diversity, and on the importance of other food sources (Posidonia leaves and litter, animal epiphytes, suspended particular organic matter, …) in those amphipods’ diet. To assess these phenomena, we used stable isotopes ratios of carbon and nitrogen as trophic tracers. It appears that, while some species (such as Apherusa chiereghinii and Aora spinicornis) seem to feed mainly on epiphytes, others, like Dexamine spiniventris, exploit different food sources. These results thus tend to show that amphipod trophic diversity could have been underestimated in the past. Moreover, they enhance the comprehension of the feeding ecology of these animals, and therefore of the way they interact with the Posidonia meadow ecosystem. [less ▲]

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See detailNew insights in mammalian auditory organ development
Thelen, Nicolas ULg; Malgrange, Brigitte ULg; Thiry, Marc

Conference (2008, October 30)

Although the structure of the auditory organ in mature mammals, the organ of Corti, is clearly established, its development is far from being elucidated. Using cytochemical and immunohistochemical methods ... [more ▼]

Although the structure of the auditory organ in mature mammals, the organ of Corti, is clearly established, its development is far from being elucidated. Using cytochemical and immunohistochemical methods at the light and electron microscope levels, we examined its spatiotemporal development in rats from embryonic day 16 (E16) to E19. At E16, whatever the region of the cochlear studied (base, middle, apex), the organ of Corti was not present. We demonstrate that the organ of Corti develops from a non-proliferative cell zone that is located in the junctional region between the greater epithelial ridge and the lesser epithelial ridge of the cochlear duct and that is characterized by the presence of numerous microvilli. Using the periodic acid-thiocarbohydrazide-silver proteinate method, we revealed that the first cells to develop in this zone are the inner pillar cells, a particular type of nonsensory supporting cells. They arise in the base of the cochlear duct at the boundary between the two ridges at E16. The cell differentiation in this prosensory region continues according to a base-to-apex gradient, the inner hair cells appearing in the greater epithelial ridge at E17 and the outer hair cells in the lesser epithelial ridge at E18. At E19, all the different cell types of the organ of Corti are well in place. We also showed that the development of the inner pillar cells within the prosensory region does not involve Notch1 signaling. These results highlight the central role that the inner pillar cells could play in the development of the organ of Corti. [less ▲]

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See detailLes identités d'après la théorie des discours (Laclau, Mouffe)
Spinoy, Erik ULg

Conference (2008, October 29)

This papers presents the way identity/difference is conceived of in discourse theory, and especially in the work of Ernesto Laclau and Chantal Mouffe.

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See detailStimuli-responsive surfaces by electrografting
Jérôme, Christine ULg

Conference (2008, October 28)

The design of stimuli-responsive coatings on a variety of solid surfaces is the topic of increasing researches. In this area, the adhesion of a stimuli-responsive polymer to the inorganic support whatever ... [more ▼]

The design of stimuli-responsive coatings on a variety of solid surfaces is the topic of increasing researches. In this area, the adhesion of a stimuli-responsive polymer to the inorganic support whatever the conditions of pH and temperature, remains a concern. In this field, we have been studying an electrochemical process able to initiate the polymerization of acrylic derivatives together with promoting their chemisorption to the substrate used as electrode. We have demonstrated the versatility of this method that can be applied to a variety of acrylics leading to the possible generation of responsive coatings to either pH or temperature. Reversible anchoring of molecules of interest has also been achieved recently by this method based on the grafting of dienes able to bind a dienophile and release it at higher temperature by retroDiels-Alder reaction. The electroinitiation has been found compatible with a variety of surfaces going from conventional metals (iron, steel, gold) to carbon (fibers and nanotubes) and semi-conductors (doped-silicon), which spreads the applications to various fields such as medical devices, biosensors, catalysis, electronics and photovoltaics. Particularly, the application of this process to AFM tips allows the straightforward functionalization of these devices allowing not only the handling of polymers at the molecular level but also the elaboration of various temperature, pH or analyte sensitive sensors at the nanometer scale. [less ▲]

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See detailEnvironment and forced migration: a policy-relevant research approach
Gemenne, François ULg

Conference (2008, October 28)

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See detailL'ambigua vitalità del personaggio d'Annunzio
Benzoni, Pietro ULg

Conference (2008, October 24)

Detailed reference viewed: 9 (1 ULg)
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See detailL’hémorragie cérébrale : le coup de tonnerre dans un ciel serein
Martin, Didier ULg

Conference (2008, October 23)

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See detailNa et K anormaux : A quoi faut-il penser?
Krzesinski, Jean-Marie ULg

Conference (2008, October 23)

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See detailImportance of pigtailed macaques (Macaca nemestrina leonina) in seed dispersal: Impact on the ecological balance of the tropical rainforest at Khao Yai National Park, Thailand
Albert, Aurélie ULg; Huynen, Marie-Claude ULg

Conference (2008, October 22)

The tropical rain forest is maintained thanks to a precarious balance placed under the yoke of interactions between the various animal and plant species which compose it. Among them we can find those ... [more ▼]

The tropical rain forest is maintained thanks to a precarious balance placed under the yoke of interactions between the various animal and plant species which compose it. Among them we can find those implying plants and frugivores. Today, no study was still undertaken on the pigtailed macaques (Macaca nemestrina leonina) because they are considered seed predator. However, recent studies showed that it could actually be a key-species in the dispersion of many plant species. The study will take place in the Khao Yai National park (2,168 km²), Thailand. We will follow a troop of forty individuals habituated to humans and already well-known. Our goal will be to establish the importance of the pigtailed macaques in the maintenance and the regeneration of the tropical rain forest. Thus we will try to evaluate their capacity of being good seed dispersers. In this purpose we will study: 1) the spatiotemporal distribution, the productivity and the characteristics of the plant species present on the home range of the studied troop, 2) the ranging patterns of the macaques within their home range, 3) their feeding behaviour, notably the fruit selection and the various modes of processing seeds, and finally 4) their impact on the viability and the germination potential of seeds. The study of seed dispersal by these macaques would enable us to step further into the understanding of this environment and, perhaps, to improve the destiny of the pigtailed macaques, species now characterized as “vulnerable”, in recognizing them a paramount role in the conservation of their habitat. [less ▲]

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See detailDebates on osteoporosis management
Bruyère, Olivier ULg

Conference (2008, October 18)

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See detailPratique de la pharmacie clinique: Expérience en Gériatrie
Van Hees, Thierry ULg

Conference (2008, October 18)

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See detailAbout the regularity and the irregularity of some nondi erentiable functions
Nicolay, Samuel ULg

Conference (2008, October 17)

We study the Hoelder regularity of some "historical" nondifferentiable functions

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See detailLes capacités, un nouvel étalon pour évaluer les inégalités ?
Orianne, Jean-François ULg; Verhoeven, Marie

Conference (2008, October 17)

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See detailDroits, base informationnelle et action publique
De Munck, Jean; Orianne, Jean-François ULg; Salais, Robert

Conference (2008, October 17)

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See detailVacillating between the Universal and the Particular
Spinoy, Erik ULg

Conference (2008, October 17)

This paper discusses the recent trend to privilege the particular over the universal, and points out that, while it is true that all universality is 'stained' by the particular, the particular itself is ... [more ▼]

This paper discusses the recent trend to privilege the particular over the universal, and points out that, while it is true that all universality is 'stained' by the particular, the particular itself is unthinkable without a reference to the universal. This is exemplified by a number of cases from philosophy, cultural theory and literature. [less ▲]

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See detailEvaluation subjective de la voix (VHI) chez 723 enseignants en région Bruxelloise.
Morsomme, Dominique ULg; Russel, Sophie; Jamart, Jacques et al

Conference (2008, October 14)

Les études montrent qu’en moyenne 20% des enseignants présentent des troubles vocaux. Les auteurs relèvent des symptômes fréquents comme la raucité, la fatigue vocale, l’aggravation de la voix, les ... [more ▼]

Les études montrent qu’en moyenne 20% des enseignants présentent des troubles vocaux. Les auteurs relèvent des symptômes fréquents comme la raucité, la fatigue vocale, l’aggravation de la voix, les douleurs péri-laryngées et la sensation d’inconfort physique. Ils rapportent que la dysphonie est plus fréquente chez les femmes. L’âge, le nombre d’années d’expérience, le type de cours enseigné les facteurs environnementaux, l’abus, le malmenage vocal et le stress ont un impact sur la voix. Ces facteurs amenuisent les performances vocales professionnelles des enseignants et ont des conséquences non négligeables en terme d’économie. Dans notre étude, nous avons évalué la voix de 723 enseignants (F :634/ H :89), exerçant en écoles ordinaires ou en écoles à discrimination positive, à l’aide du VHI. Nous avons établi un premier état des lieux dans 15 communes de la région bruxelloise. Des mesures de fiabilité, de pertinence et de cohérence ont été réalisées. Nous obtenons une bonne fiabilité test-retest (F : 0,774 ; E : 0.749 ; P : 0.806 ; G : 0.836 – p>0.001 pour tous). Les scores du re-test sont significativement inférieurs pour les 3 sous-échelles (F p<0.001 ; E p=0.003 et P p<0.001) et le score global (p<0.001). La corrélation entre les 3 sous échelles est élevée (FvsE : 0.434 ; FvsP :0.455 ; EvsP : 0.527). La prévalence des troubles vocaux a été calculée en tenant compte des variables antécédents ORL, logopédiques et des traitements logopédiques en cours. Elle s’élève à 10,5%. Les enseignants ayant été confronté à une difficulté vocale (vu par un ORL ou/et un logopède) présentent donc des scores plus élevés au VHI global. Par contre, nous observons que plus les sujets sont âgés et ont de l’expérience moins ils ont de troubles vocaux (p=0.026 et p=0.013). De même, les variables telles que le genre (p≥ 0.063), la matière enseignée (p≥ 0.468), le fait de fumer (p=0.757), le type (p≥ 0.867) et le degré d’enseignement (p≥ 0.212) n’influent pas de manière significative les scores aux V.H.I. [less ▲]

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See detailNASS Congress
Martin, Didier ULg

Conference (2008, October 14)

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See detailApport de la caméra à haute vitesse en comparaison avec la stroboscopie.
Remacle, Marc; Morsomme, Dominique ULg

Conference (2008, October 14)

Introduction:La stroboscopie est indispensable au bilan des troubles de la voix affectant les cordes vocales. Elle est toutefois basée sur la reconstitution d'une image de représentant pas la réalité. Sur ... [more ▼]

Introduction:La stroboscopie est indispensable au bilan des troubles de la voix affectant les cordes vocales. Elle est toutefois basée sur la reconstitution d'une image de représentant pas la réalité. Sur ce plan la caméra à haute vitesse permettant d'observer des cycles vibratoires réels lui est supérieure. Les problèmes techniques: coût, stockage et traitements des images .. n'ont pas permis sa diffusion et son emploi en phoniatrie clinique.Nous présentons la comparaison des enregistrements obtenus avec la caméra à haute vitesse Wolf avec ceux acquis avec le stroboscope (strobobase) de la même firme.Matériels et méthodes: La caméra à haute vitesse Wolf (Knittlige, Allemagne) permet d'enregistrer des séquences de 2 sec soit de 4000 ou de 2000 images/s. L'enregistrement est en couleur. L'examinateur peut choisir parmi ces 2 sec une séquence pertinente pour stockage dans le disque dur et analyse complémentaire. Les analyses complémentaires sont essentiellement la kimographie et la mesure de l'écartement du bord libre des cordes vocales au cours de la séquence. Cette dernière mesure est traduite de manière graphique, évoquant l'électroglottographie. La mesure est faite simultanément à la partie antérieure médiane et postérieure des cordes vocales. Le strobosbase est basé sur un système de shutter activé classiquement par un microphone de contact. Trente cinq patients représentant l'ensemble de la pathologie bénigne des cordes vocales ont été enregistrés successivement avec les deux systèmes. La qualité de l'image, la contribution au diagnostic et au traitement ont été observées avec les deux systèmes. Résultats: Dans tous les cas, la qualité de l'image stroboscopique est nettement supérieure à celle de la caméra à haute vitesse. Celle-ci ne disposant pas d'assez de pixels. Dans aucun cas la caméra à haute vitesse n'a modifié le diagnostic. La caméra à haute vitesse apporte toutefois des renseignements supérieurs à la stroboscopie en cas de béance glottique (paralysie, encoche, presbyphonie, ...). Grâce à la kymographie et à l'analyse de l'écartement des cordes vocales. Sur dix sept cas de béances glottiques, la décision thérapeutique a été modifiée 4 fois après examen à la caméra à haute vitesse. Discussion: La caméra à haute vitesse de modèle Wolf ne peut remplacer la stroboscopie dans l'état présent. Elle est un complément utile pour l'étude des béances glottiques en permettant une meilleure observation des phases d'ouverture et de fermeture. Elle contribue ainsi à la décision thérapeutique. Le choix subjectif d'une séquence parmi les deux enregistrées peut être un biais important. [less ▲]

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See detailALADDIN performance model
Absil, Olivier ULg

Conference (2008, October 13)

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See detailFrom Bio to Nano: Learning From The Past to Shape the Future of Technology Assessment
Delvenne, Pierre ULg; Fallon, Catherine ULg; Thoreau, François ULg et al

Conference (2008, October 12)

In many Western countries over the last 35 years, the quest for more scientific governance on <br />crucial technological issues led to a broadening of the political world’s sphere of competences. <br ... [more ▼]

In many Western countries over the last 35 years, the quest for more scientific governance on <br />crucial technological issues led to a broadening of the political world’s sphere of competences. <br />Indeed, various countries decided that dealing with global, invisible, irreversible and irreparable <br />risks had to be handled by an appropriate tool of management of technological innovations. So the <br />usefulness to institutionalize parliamentary Technology Assessment (PTA) offices emerged. <br />Nowadays, PTA is an instrument particularly suitable to study the new shape of science and <br />society’s interface and it represents a remarkable attempt to reform the institutional settings of <br />innovation. <br />However, while the overall uncertainty surrounding science and technology has been used by public <br />actors like parliamentarians or ministers in the past to legitimize a first generation of PTAs, the <br />emergence of a second generation in the 1990’s – centred on the constructive, interactive or <br />participatory TA approches – emphazises the co-evolution of technology and society rather than the <br />former linear determinist rationale. In this context, the STS community of scholars is increasingly <br />called upon by the public authorities to provide a “professional service role” (RIP, 1994), that is to <br />say to take a step into action out of the border of their intellectual engagement. <br />Then, we suggest to compare two successive periods by looking at the institutional management of <br />two distinct-but-complementary technological issues: biotechnology and nanotechnology. The <br />former has been taken into account by public actors at a time when the second generation of PTAs <br />was not yet rooted in the political practices. Thus, the management of the public debate related to <br />biotechnology has been characterized by a lack of sensitive, fruitful and interactive communication <br />between the stakeholders involved in the TA process, while the first applications were already being <br />commercialized. On the other hand, the latter is currently being tackled at a moment when the social <br />shaping of technology is widely acknowledged as well as the STS community may be invited to <br />pass from observation to participation in the political sphere. Given the uncertainty and complexity <br />encircling nanotechnology as well as its huge potential in many interconnected disciplinary fields, <br />the need to avoid the pitfall of the biotechnology’s experience is commonly accepted. <br />We offer to take nanotechnology as one of the most challenging technological issue to look beyond <br />the biotechnology’s roadblock and to show in which proportion the same scenario is reasonably <br />thinkable today, in order to spotlight whether we have learnt from the past in considering what is <br />1 <br />sometimes called “a new industrial revolution”. <br />We will raise some research questions like: how different are current TA practices as compared to <br />former ones? Are there new regimes emerging? Given the current technological convergence, how <br />complicated would it be to deal with NBIC technologies if we missed the point with biotechnology <br />alone? How suitable is PTA to engage in such interdisciplinary issues? Are we assisting the <br />emergence of a third PTA generation around the growing role of the STS community? How does <br />this scientific community dialogue with the historians of science who analyzed the earlier industrial <br />revolutions? [less ▲]

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See detailIRM interventionnelle : vers une neuronavigation en temps reel
Martin, Didier ULg

Conference (2008, October 11)

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See detailTransplantation hépatique à partir de donneurs cadavériques à coeur arrêté: expérience multicentrique belge de 58 cas sur 5 ans
Detry, Olivier ULg; Rahmel, Axel; Donckier, Vincent et al

Conference (2008, October 11)

Detailed reference viewed: 37 (14 ULg)
See detailIR and UV Spectroscopy of DNA Ions Stored in Trap Instruments
Gabelica, Valérie ULg

Conference (2008, October 11)

Detailed reference viewed: 16 (0 ULg)
See detailLa production du fer en région liégeoise au Moyen-Age: Apport d'une analyse technologique de renforts de charpentes datées par dendrochronologie
Mertens, Anne ULg

Conference (2008, October 10)

La région liégeoise est passée à la postérité pour avoir été un des berceaux d'une mutation technique importante pour la production du fer: le développement du procédé indirect de réduction du minerai de ... [more ▼]

La région liégeoise est passée à la postérité pour avoir été un des berceaux d'une mutation technique importante pour la production du fer: le développement du procédé indirect de réduction du minerai de fer, impliquant l'élaboration dans un haut-fourneau d'une fonte riche en carbone, qui doit ensuite être affinée pour obtenir du fer. Cependant la chronologie de la diffusion de ce nouveau procédé est à l'heure actuelle encore assez mal connue, les sources textuelles se montrant plutôt discrètes quant aux détails techniques. L'apport d'une étude technique d'échantillons de fer provenant de bâtiments médiévaux, bien datés par leur contexte architectural et couvrant la période du XIIIème au XVIIème siècles, est donc envisagée ici. Cette étude a en particulier permis de détecter la production de fer par la filière indirecte dès les années 1330, soit à une date légérement antérieure aux premières mentions dans les sources écrites (datées vers 1371). [less ▲]

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See detailLe diagnostic différentiel des troubles musculaires
Van Galen, Gaby ULg; Votion, Dominique ULg

Conference (2008, October 10)

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See detailPrélèvement d'organes après euthanasie: expérience belge
Ysebaert, Dirk; Detry, Olivier ULg; Squifflet, Jean-Paul ULg et al

Conference (2008, October 10)

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See detailAnthropologie philosophique ou Wissenschaftslehre?
Dewalque, Arnaud ULg

Conference (2008, October 09)

Quelle place la philosophie doit-elle faire à la « question anthropologique » ou à la « question de l’homme » ? En dépit du succès incontestable de l’anthropologie philosophique dans le courant du ... [more ▼]

Quelle place la philosophie doit-elle faire à la « question anthropologique » ou à la « question de l’homme » ? En dépit du succès incontestable de l’anthropologie philosophique dans le courant du vingtième siècle, cette question est peut-être, comme on sait, plus complexe qu’il n’y paraît. Les travaux de Daniel Giovannangeli, en retraçant les médiations que l’on connaît (Kant lu par Heidegger, lui-même lu par Sartre et relu par Foucault), ont largement mis en lumière cette complexité. Sur quoi repose-t-elle ? Pourquoi l’orientation sur l’homme semble-t-elle à la fois incontournable et trop réductrice ? Je me bornerai ici à avancer une hypothèse, vers laquelle convergent, me semble-t-il, les travaux de D. Giovannangeli, et que je formulerais pour ma part de la manière suivante : le traitement philosophique de la question anthropologique est indissociable d’un problème de fondation, la philosophie se caractérisant elle-même prioritairement par une dimension fondationnelle. [less ▲]

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See detailConvective drying tests of silt: experimental studies and modelling
Gerard, Pierre ULg; Bernadino, Joao; Léonard, Angélique ULg et al

Conference (2008, October 06)

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See detailDe la cinémathèque au musée : le film exposé ou les métamorphoses du monument
Thonon, Jonathan ULg

Conference (2008, October 04)

Detailed reference viewed: 13 (0 ULg)
See detailSterile technique facts and fiction
Brichant, Jean-François ULg

Conference (2008, October 04)

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See detailOblique Object
Winand, Jean ULg

Conference (2008, October 03)

Detailed reference viewed: 9 (0 ULg)
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See detailQualitative analysis of pilot selection and basic flying training.
Bertrand, Françoise ULg; Tibax, V.; Hansez, Isabelle ULg

Conference (2008, October 03)

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See detailThe unexpected hidden face of the Cephalosporin Antibiotic Ceftazidime: From biological to chemical and physical activities against oxidant species produced by phagocytes
Mouithys-Mickalad, Ange ULg; Deby-Dupont, Ginette; Mathy-Hartert, Marianne ULg et al

Conference (2008, October 03)

Background: Over several decades the use of antibiotics to treat infectious and bacterial diseases has been the main challenge. Ceftazidime (CAZ), belonging to the cephalosporin’s family, is known as ... [more ▼]

Background: Over several decades the use of antibiotics to treat infectious and bacterial diseases has been the main challenge. Ceftazidime (CAZ), belonging to the cephalosporin’s family, is known as empiric treatment for severe sepsis. Beside its antibiotic effect, CAZ has been shown to have other properties, making it unique. This study is aimed to investigate unexpected antioxidant properties of CAZ with special emphasis on the mechanism of action. Methods: Four in vitro and ex-vivo experimental models were designed 1) Assay of proteinases inhibitory activity of α2-macroglobulin (α2M) in the presence of trypsine (1.4µg) with or without 10-3 M CAZ, in 0.1 M Tris-HCl at pH 8.1. 2) Assessment of MPO-induced toxicity on endothelial cells or oxidant activities of stimulated phagocytes (PMNs) using 160 µM ferricytochrome C. 3) Effect of CAZ on two models of anoxia/reoxygenation from adherent and suspension alveolar cells (A549, 106 to 1010 cells/ml) using oxymetry coupled to EPR-spin trapping technique. 4) Cell-free systems to investigate: lipoperoxidation of linoleate induced by γ-irradiation, Fe2+/ascorbate system or ferryl species; Quenching of hydroxyl radical (·OH) and singlet oxygen (1O2)-scavenging activity from Mallet’s (H2O2/NaOCl) and Fenton’ reactions. Results: Ex-vivo assays show efficient protective effect of CAZ on plasmatic antiproteinases against oxidative stress; a dose-dependent inhibitory capacity on endothelial and A549 cells against MPO toxicity or excessive production of ROS during anoxia/reoxygenation. On cell-free systems, CAZ had unique 1O2–scavenging activity; and less effect on ferryl species. CAZ exerts its antioxidant effect by chelating activity. Conclusions: Overall results indicate that: 1) CAZ protects endothelial cells against MPO toxicity but also A549 cells towards the effect of anoxia/reoxygenation; 2) CAZ protects α2M and 3) acts as efficient inhibitor of lipid peroxidation of linoleate and hydroxyl radical and as singlet oxygen-scavengers. Antioxidant properties of CAZ might be relevant in clinical situations where excessive activation of leukocytes is known and in anoxia/reoxygenation model cause an increased production of ROS. [less ▲]

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See detailLes bénéfices de l'apprentissage d'application web 2.0 pour un public fragilisé
Géron, Stéphanie ULg; Jacquet, Maud ULg

Conference (2008, October 02)

Application web 2.0 et public fragilisé : présentation d'un module sur le traitement de texte en ligne dans le cadre du projet PMTIC

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See detailAnalysis of climatic conditions of wildfires in Belgium with an automatic daily atmospheric circulation patterns classification
Erpicum, Michel ULg; Fettweis, Xavier ULg; Mabille, Georges ULg

Conference (2008, October 02)

An automatic daily atmospheric circulation patterns classification was built using the geopotential heights of 850 hPa level from the ECMWF (re)analysis over the period 1958-2007. The classification is ... [more ▼]

An automatic daily atmospheric circulation patterns classification was built using the geopotential heights of 850 hPa level from the ECMWF (re)analysis over the period 1958-2007. The classification is based on a similarity index between two 850hPa geopotential maps centred on Belgium, taking into account the slope difference between both daily geopotential surfaces as well as the absolute geopotential difference between both surfaces. Wildfire occurrences are analysed in April and September together with monthly frequencies and persistences of daily atmospheric circulation patterns types as well as with monthly variability of weather climate conditions. [less ▲]

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See detailLimestone karst rodents in Southeast Asia
Latinne, Alice ULg; Michaux, Johan ULg

Conference (2008, October 02)

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See detailNew cycles found in air temperature data and proxy series
Nicolay, Samuel ULg; Mabille, Georges ULg; Fettweis, Xavier ULg et al

Conference (2008, October 01)

We apply the wavelet transform tool to detect unsuspected cycles in several climatic time series

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See detailWatch out Burn out
Nyssen, Anne-Sophie ULg

Conference (2008, October)

Detailed reference viewed: 26 (4 ULg)
See detailHistopathological comparison of two mouse-adapted influenza A strains in mice.
Garigliany, Mutien-Marie ULg; Habyarimana, Adélite; Cornet, Anne et al

Conference (2008, October)

Detailed reference viewed: 15 (7 ULg)
See detailVitamine D: effets « phosphocalciques » et « non-phosphocalciques ».
Cavalier, Etienne ULg; Souberbielle, Jean-Claude

Conference (2008, October)

Detailed reference viewed: 32 (2 ULg)
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See detailLa gestion de la diversité dans les PME
Cornet, Annie ULg; Warland, P.

Conference (2008, October)

Detailed reference viewed: 79 (12 ULg)
See detailLa notion d'infiniment petit dans la construction des raisonnements économistes
Henry, Valérie ULg

Conference (2008, October)

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See detailCrossed random effects models for the detection of differential item functioning in psychometrics
Magis, David ULg; Frederickx, Sofie; Tuerlinckx, Francis et al

Conference (2008, October)

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See detailSedimentological traces of earthquakes in recent lakes sediments along the North Anatolian Fault, Turkey
Avsar, Ulas; Boes, X; Hubert, Aurelia ULg et al

Conference (2008, October)

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See detailFire Performance of undamaged and pre-damaged welded steel-concrete composite beam-to-column joints with concrete filled tubes
Alderighi, Elisabetta; Bursi, Oreste; Franssen, Jean-Marc ULg et al

Conference (2008, October)

Major earthquakes in urban areas have often been followed by significant conflagrations that have been difficult to control and have resulted in extensive damage to property. Earthquakes, then, increase ... [more ▼]

Major earthquakes in urban areas have often been followed by significant conflagrations that have been difficult to control and have resulted in extensive damage to property. Earthquakes, then, increase the risk of loss of life if a fire occurs within a building. It is obvious therefore that a fire after an earthquake is a design scenario that should be properly addressed in any performance-based design, in locations where significant earthquakes can occur. In this paper both experimental and numerical results of undamaged and pre-damaged welded steel-concrete composite beam-to-column joints with concrete filled tubes are described as part of a European project aimed at developing fundamental data, design guidelines and prequalification of ductile and fire resistant composite beam-to-column joints. In detail, both the experimental program and the fire experimental results are presented and discussed in this paper together with thermal numerical simulations on frames and joints. Both the experimental activity and the numerical work demonstrated the adequacy of the seismic and joint fire design. [less ▲]

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See detailTransect GLACIOCLIM-SAMBA : observation et modélisation du Bilan de Masse de Surface sur la zone de transition côte-plateau Antarctique
Agosta, Cécile ULg; Genthon, Christophe; Favier, Vincent et al

Conference (2008, October)

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See detailMolecular Systematics of Rattini in South East Asia
Pagès, Marie ULg

Conference (2008, October)

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Peer Reviewed
See detailLe goût et l'odorat, une sensorialité commune?
Von Hoffmann, Viktoria ULg

Conference (2008, October)

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See detailSpatial heterogeneity at small scale in the microbenthic loop of Posidonia oceanica meadows
Pete, Dorothée ULg; Lenartz, Fabian ULg; Velimirov, Branko et al

Conference (2008, October)

In the Mediterranean coastal zone, one the most important ecosystem is the Posidonia oceanica meadow. This seagrass is endemic of the Mediterranean Sea and plays many important ecological roles like ... [more ▼]

In the Mediterranean coastal zone, one the most important ecosystem is the Posidonia oceanica meadow. This seagrass is endemic of the Mediterranean Sea and plays many important ecological roles like oxygen production, nursery for numerous commercial species of fishes and protection of coastal zones by reducing the impact of waves. However, there is a severe lack of informations on small scale variations in its sediment compartment. In an attempt to understand spatial variations in the microbenthic loop (bacteria, organic matter, microphytobenthos and meiofauna) of this ecosystem, an experiment was led in Calvi Bay (Corsica, France), in March 2008, at 10 m depth. Twelve points were sampled randomly in a 125 x 125 cm grid, divided into twenty-five 25 x 25 cm squares, to assess and describe the spatial distribution and variations of different parameters of the sediment. Those parameters are granulometry, density of the P. oceanica meadow, nutrients concentration in pore water, bacteria (biomass, abundance, morphotypes), organic matter (biomass), microphytobenthos (biomass), roots and rhizomes (biomass) and meiofauna (biomass). Distribution maps were produced using the DIVA (Data-Interpolating Variational Analysis) method. Our results prove that the sediment compartment is highly heterogeneous at small scale, especially for bacteria and in the first centimeter of sediment cores. Moreover, a correlation has been established between microphytobenhtos variations and phosphate concentration in pore water. For the first time, such small scale variations are depicted in a P. oceanica meadow, which underlines the importance to take them into account in sampling strategies. [less ▲]

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See detailBases biologiques et éco-hydrauliques pour la restauration de la continuité piscicole en rivière : premier bilan et perspectives en Région Wallonne (Belgique).
Ovidio, Michaël ULg; Philippart, Jean-Claude ULg; Denoel, Philippe et al

Conference (2008, October)

Dans le prolongement de la Directive Benelux d’avril 1996 (libre circulation des poissons migrateurs) et de la Directive Cadre sur l’Eau de l’Union Européenne (2000/60/CE), le rétablissement de la ... [more ▼]

Dans le prolongement de la Directive Benelux d’avril 1996 (libre circulation des poissons migrateurs) et de la Directive Cadre sur l’Eau de l’Union Européenne (2000/60/CE), le rétablissement de la continuité piscicole dans nos cours d’eau fait partie des objectifs prioritaires de la Direction des Cours d’eau Non Navigables du Ministère de la Région Wallonne. Depuis 1997, différents acteurs, gestionnaires, sociétés de pêches et scientifiques abordent en profondeur cette problématique par l’exécution de différentes actions intégrées. Depuis environ 10 ans, un travail de terrain considérable est accompli pour le compte de la Région wallonne par la Fédération de Pêche Vesdre-Amblève (asbl) qui répertorie et géoréférence la totalité des obstacles physiques susceptibles de perturber la continuité piscicole dans les cours d’eau de Wallonie. En parallèle, le Laboratoire de Démographie des Poissons et d’Hydroécologie (LDPH) de l’Université de Liège étudie l’impact biologique de certains de ces obstacles sur les populations de poissons, principalement en utilisant la technique du radio-pistage. Ces recherches permettent de mieux connaître les phénomènes de mobilité et de migrations des poissons de nos cours d’eau ainsi que leurs capacités à franchir en remontée des obstacles typologiquement très différents. Ces travaux permettent d’identifier les sites critiques qui doivent prioritairement êtres équipés de dispositifs de franchissement efficaces. Le contrôle scientifique du fonctionnement des passes migratoires nouvellement construites démontre clairement leurs effets positifs sur la qualité écologique et piscicole de la rivière. De tels résultats justifient fortement de multiplier ce type d’action de restauration écologique (hydromorphologique) dans d’autres cours d’eau. Au cours de notre exposé, nous présenterons, avec des résultats concrets, un premier bilan des travaux déjà effectués et nous dégagerons les perspectives à moyen et long terme en matière de libre circulation des poissons dans les cours d’eau wallons, non seulement en remontée mais aussi en descente (ou dévalaison). [less ▲]

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See detailOcean biogeochemical cycles and climate sensitivity in an Earth system model
Mouchet, Anne ULg; Loutre, M. F.; Fichefet, T. et al

Conference (2008, October)

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See detailUne lecture scientométrique de la littérature sur les réseaux sociaux en sciences de gestion et en entrepreneuriat
Froehlicher, Thomas ULg; Bares, Franck; Bourgne, Patrick

Conference (2008, October)

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See detailMulti-scale spatial variability of amphipod assemblages from the foliar stratum of the Posidonia oceanica (L.) Delile meadow
Sturaro, Nicolas ULg; Lepoint, Gilles ULg; Michel, Loïc ULg et al

Conference (2008, October)

Studying spatial patterns is of ecological importance in order to understand the causes of the distribution and abundance of organisms, and it also provides valuable basis for management and conservation ... [more ▼]

Studying spatial patterns is of ecological importance in order to understand the causes of the distribution and abundance of organisms, and it also provides valuable basis for management and conservation. In the Mediterranean coastal zone, the Posidonia oceanica seagrass meadows constitute one of the dominant ecosystems and are an important habitat for vagile invertebrates. Among these, amphipods comprise a large number of species, with considerable abundance and biomass, as well as being an important trophic resource for fish populations. Until now, little attention has been given to the horizontal variability at different spatial scales of amphipod assemblages associated with P. oceanica meadows. A hierarchical sampling design, spanning three orders of magnitude (from 1 to 100s of metres) was elaborated. Sampling was undertaken in March 2007 in the meadows of Calvi Bay (NW Corsica), at depths ranging from 10 to 13 m, using a suction sampler. Our results indicated an important horizontal variability of the studied assemblage, and this at different spatial scales. In addition, these results tend to show that the small scale (~ 1 m and ~ 10 m) influenced abundance, while the medium-scale (~ 100 m) influenced diversity. Some potential causes of the observed patterns are discussed. These results emphasize the importance of considering different spatial scales in the study of the vagile invertebrates associated with P. oceanica meadows. [less ▲]

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See detailRemote Sensing of Suspended Particulate Matter in Turbid Waters: State of the Art and Future Perspectives.
Ruddick, Kevin; Nechad, Bouchra; Park, Youngje et al

Conference (2008, October)

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See detailCoded structural light imaging system for weed detection in outdoor conditions
Destain, Marie-France ULg; Piron, Alexis ULg

Conference (2008, October)

A method of determining the position of weeds growing in soil amongst crops is described. Is uses a camera to acquire stereoscopic images of plants.

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See detailLa répression du négationnisme en Belgique : de la réussite législative au blocage politique
Grandjean, Geoffrey ULg

Conference (2008, October)

This study focuses on the prosecution of genocide-denial in Belgium and on the current deadlock of this political question. A political science approach is used to shed light on this issue which makes ... [more ▼]

This study focuses on the prosecution of genocide-denial in Belgium and on the current deadlock of this political question. A political science approach is used to shed light on this issue which makes often the headlines. The study is based on the analysis of parliamentary documents and on several interviews with the key actors of this issue. This approach enables an analytic understanding of this question. The research topic is all the more meaningful because it concerns dialectics between the present and the past and it puts into questions the place of history in politics. [less ▲]

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See detailOn mathematical concepts for the material world
Leclercq, Bruno ULg

Conference (2008, September 25)

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See detailEmerging International Standards : If a dream could come true
Michel, Quentin ULg

Conference (2008, September 25)

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See detailReflection spheres of the public, social and cooperative economy
Fecher-Bourgeois, Fabienne ULg; Lévesque, Benoît

Conference (2008, September 24)

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See detailThree-dimensional extension of the Io UV footprint emissions
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2008, September 23)

The Io UV footprint is an auroral feature observed close to the feet of the field lines passing through Io on both Jovian hemispheres. These light emissions are caused by the electromagnetic interaction ... [more ▼]

The Io UV footprint is an auroral feature observed close to the feet of the field lines passing through Io on both Jovian hemispheres. These light emissions are caused by the electromagnetic interaction between the satellite Io and the Jovian magnetosphere. For both the north and south poles, the Io footprint appears as a bright spot followed by a faint trailing tail and occasionally followed or preceded by secondary spots. The footprint morphology and the spots multiplicity have been found to vary with the location of Io in the plasma torus. [less ▲]

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See detailJupiter’s main auroral emission; local time and temporal variability
Grodent, Denis ULg; Radioti, Aikaterini ULg; Bonfond, Bertrand ULg et al

Conference (2008, September 23)

Jupiter's main auroral oval is associated with the ionosphere-magnetosphere coupling current system which is related to the breakdown of corotation in the middle magnetosphere. Its auroral footpath is ... [more ▼]

Jupiter's main auroral oval is associated with the ionosphere-magnetosphere coupling current system which is related to the breakdown of corotation in the middle magnetosphere. Its auroral footpath is usually represented as a smooth line closing around the pole. However, this simplistic view is misleading in many regards. We have constructed a new reference contour in the northern hemisphere (Figure 1), based on more than 1000 HST/UV images, which does not look like an oval and does not close around the pole. We use this reference contour to quantify the effects of temporal and local time variability of the magnetospheric plasma characteristics on the location of the main auroral emission. Beyond the orbit of Ganymede (15RJ), two key ingredients are expected to have a measurable influence on the instantaneous shape of the main emission contour: the azimuthal current flowing in the current sheet [1,2] and the corotation breakdown distance. The former affects the radial extent of the magnetic field lines, and the latter determines the radial location of the field aligned currents transmitting momentum from the planet to the lagging plasma. So far, models used to magnetically map the auroral main emission between the ionosphere and the equatorial plane assumed that these two parameters are constant and axisymmetric. However, in situ observations, mainly by Galileo, have revealed large local time asymmetries and temporal variations in the plasma flows and distribution. These variations have an impact on the azimuthal current and the distance at which the plasma angular velocity becomes significantly smaller than planetary rotation. We use a new magnetic field model [3], inherited from VIP4 and including a magnetic anomaly in the northern hemisphere, to simulate the effects of these asymmetries on the location of the main auroral emission, and interpret the large scattering of the corresponding HST data point. [less ▲]

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See detailThe altitude of Saturn’s aurora: implications for the auroral electron energy and location of the polar homopause
Gérard, Jean-Claude ULg; Bonfond, Bertrand ULg; Gustin, Jacques ULg et al

Conference (2008, September 23)

The Space Telescope Imaging Spectrograph (STIS) and the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST) have been used to study the characteristics of Saturn’s FUV aurora ... [more ▼]

The Space Telescope Imaging Spectrograph (STIS) and the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST) have been used to study the characteristics of Saturn’s FUV aurora, which is dominated by the Lyman and Werner bands of H2 and the H Lyman-α line. Images have been analyzed to determine the altitude of the emission above the limb and infer the characteristic energy of the auroral electrons. Our study shows that the peak of the emission is located 1000-1300 km above the limb, indicating that the precipitated electrons are mostly in the 0.1-1 keV energy range, that is significantly less than on Jupiter. Another source of information on the electron energy are the FUV spectra obtained with Voyager UVS (Sandel et al., 1982) and the HST-STIS (Gérard et al., 2004) and Cassini-UVIS spectrographs which only occasionally show a signature of absorption by hydrocarbons. Consequently, the emission is located above but close to the methane homopause. Finally, EUV spectra collected with the FUSE satellite (Gustin et al., 2008) provide information on the H2 column overlying the aurora through analysis of self-absorption and rotational temperature of the emitting layer from the intensity distribution among the H2 lines. If Moses et al. (2000)’s low latitude model is used to convert altitudes into pressure levels, H2 and hydrocarbon columns and temperature, discrepancies appear between the observed temperature, ultraviolet colour ratio and geometric altitude of the emission. One possibility is that the temperature near the homopause sharply increases at a pressure level higher than in the equatorial regions. [less ▲]

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See detailThe Io Footprint Morphology
Jacobsen, Sven; Saur, Joachim; Neubauer, F. M. et al

Conference (2008, September 23)

The innermost Galilean moon Io is embedded in a dense plasma torus. It disturbs the flow of the corotating torus plasma and generates MHD waves. Especially the Alfv ́ n e mode, which carries electric ... [more ▼]

The innermost Galilean moon Io is embedded in a dense plasma torus. It disturbs the flow of the corotating torus plasma and generates MHD waves. Especially the Alfv ́ n e mode, which carries electric currents along the magnetic field, is responsible for the famous Io footprint in the Jo- vian aurora. The Alfv ́ n waves are partly reflected at plasma e density gradients e.g. at the torus edges and form a compli- cated wave pattern. The footprint morphology in the Jovian aurora displays this pattern. Besides the main spot feature, a trailing wake extending over up to 100 degrees and occa- sionally occurring multiple spots indicating reflections have been identified. The intensity, the occurrence of multiple spots and the inter-spot distances have been found to vary strongly [1]. Io is moving up and down in the plasma torus confined to the centrifugal equator. It interacts with a dense plasma when located in the torus center and considerably thinner plasma at the torus flanks. The incoming plasma density controls the interaction strength and wave amplitude. This primar- ily leads to a relationship between the footprint brightness and Io’s centrifugal latitude [1]. However, it has also been shown that the reflection angle is strongly depending on the wave amplitude due to nonlinear effects [2]. This has an impact on the inter-spot distances. On the other hand this parameter is also directly affected when Io changes its posi- tion in the plasma torus. To deconvolve this system we present the results of our 3D MHD simulations showing the influence of Io’s centrifugal latitude and nonlinearities on the footprint morphology par- ticularly on the number of spots and inter-spot distances. We observe interference phenomena leading to locally en- hanced or reduced footprint brightness. We also discuss the recently observed leading spot feature [3]. [less ▲]

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See detailNovel pH responsive-copolymers for smart drug carriers
Jérôme, Christine ULg

Conference (2008, September 22)

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See detailEuropean legislation on methods for antibiotics detection in milk
Scippo, Marie-Louise ULg

Conference (2008, September 22)

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Peer Reviewed
See detailFootball and political violence
Fincoeur, Bertrand ULg

Conference (2008, September 20)

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See detailLa pré-dialyse
Krzesinski, Jean-Marie ULg

Conference (2008, September 19)

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See detailQu’est-ce que les logiciels libres ?
Lejeune, Christophe ULg

Conference (2008, September 19)

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See detailAnalyse collaborative avec Cassandre
Lejeune, Christophe ULg

Conference (2008, September 19)

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See detailApplications de la micro - PIV dans des écoulements libre et confiné
Vetrano, Maria-Rosaria; Ruwet, Vincent; Lebeau, Frédéric ULg et al

Conference (2008, September 16)

L’objectif de cette communication est l’étude de deux micro-écoulements différents au moyen d’un système de micro-PIV non inversé. Ces écoulements diffèrent entre eux par les aspects suivants: Le premier ... [more ▼]

L’objectif de cette communication est l’étude de deux micro-écoulements différents au moyen d’un système de micro-PIV non inversé. Ces écoulements diffèrent entre eux par les aspects suivants: Le premier, un écoulement pulmonaire, est représentatif d’un flux stationnaire confiné. Le second, la formation de gouttelettes par un capillaire contrôlé par un cristal piézoélectrique, est représentatif d’un écoulement périodique à surface libre. La faisabilité de ce type de mesure est évaluée en mettant l’accent sur le fait que ces expérimentations ont été menées sur des micro-écoulements courbes tridimensionnels. [less ▲]

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See detailImagination et politique chez Hobbes
Herla, Anne ULg

Conference (2008, September 11)

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See detailRecent advances in the synthesis of aliphatic polyesters by “click” chemistry
Riva, Raphaël ULg; Jérôme, Christine ULg; Jérôme, Robert ULg et al

Conference (2008, September 11)

Since the discovery of Sharpless and Meldal, the copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) is more and more popular in the field of macromolecular engineering owing to its robustness, its ... [more ▼]

Since the discovery of Sharpless and Meldal, the copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) is more and more popular in the field of macromolecular engineering owing to its robustness, its high tolerance to a wide range of functional groups without any need of protecting groups and the absence of side-products. This reaction is known to be a very efficient “click” reaction as defined by Sharpless. The chemical modification of aliphatic polyesters remains, at the time being, a very difficult task to achieve because of the very limited number of efficient chemical reactions, which can be implemented in the absence of chain degradation. The main purpose of this contribution is to report on the most recent advances on the use of CuAAC to derivatize aliphatic polyesters (Scheme 1). Interestingly enough, it was recently shown that CuAAC carried out onto aliphatic polyesters attached with either azides or alkynes is very efficient under mild conditions, which limit undesirable degradation. Several functional groups were grafted onto aliphatic polyesters by CuAAC without using any protection/deprotection reactions. The CuAAC is also very efficient to prepare aliphatic polyesters with various architectures as highlighted by the synthesis of graft copolymers, star-shaped copolymers and networks. This “click” chemistry has been combined with other polymerization mechanism such as ATRP in order to extend further the range of available polymers. [less ▲]

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