Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailPlasticization of biphasic ionomers by chemically identical, short, monofunctional oligomers
Plante, Michel; Bazuin, C Géraldine; Jérôme, Robert ULg

in Macromolecules (1995), 28(5), 1567-1574

Blends of carboxylated polystyrene ionomers containing 7 mol% of ionic units and carboxylate-terminated, monofunctional, monodisperse styrene oligomers of MW 800 were investigated by dynamic mechanical ... [more ▼]

Blends of carboxylated polystyrene ionomers containing 7 mol% of ionic units and carboxylate-terminated, monofunctional, monodisperse styrene oligomers of MW 800 were investigated by dynamic mechanical analysis and small angle X-ray scattering(SAXS). Both Cs and Ba carboxylate salts were studied,as well as blends of the Cs oligomer with homopolystyrene. The cluster phase is preferentially plasticized by the oligomers for both salts.; However, whereas the nonclustered phase of the Cs system is only a Little more plasticized than that of the Ba system, the cluster phase in the Cs system undergoes dramatic plasticization, the cluster transition disappearing at 5 wt % oligomer content. Simultaneously, the SAXS ''ionomer peak'' disappears. A peak reappears at 20 wt % oligomer content, suggesting the development of a new morphology, proposed to be micelles or ''inverted multiplets''. The difference between the two systems is attributed to the much stronger electrostatic interactions in the Ba system; this is analyzed in terms of elementary ion units. It is concluded that, whereas the nature of the nonpolar tail is relatively unimportant, the nature and strength of the electrostatic interactions involved can be of critical importance to the plasticization effects in blends of ionomers with short, monofunctional oligomers. [less ▲]

Detailed reference viewed: 13 (2 ULg)
Full Text
Peer Reviewed
See detail(Plasticized) polylactide/(organo-)clay nanocomposites by in situ intercalative polymerization
Paul, Marie-Amélie; Delcourt, Cécile; Alexandre, Michaël ULg et al

in Macromolecular Chemistry and Physics (2005), 206(4), 484-498

Both intercalated and exfoliated poly(L,L-lactide) (P(L,L-LA)/organomodified montmorillonite nanocomposites were synthesized by in situ ring-opening polymerization Of L,L-lactide, in bulk, directly in the ... [more ▼]

Both intercalated and exfoliated poly(L,L-lactide) (P(L,L-LA)/organomodified montmorillonite nanocomposites were synthesized by in situ ring-opening polymerization Of L,L-lactide, in bulk, directly in the presence of the nanofiller. Intercalation of polyester chains was found to appear even for natural unmodified montmorillonite-Na+, while exfoliation occurred when the aluminosilicate layers were modified by ammonium cations bearing primary hydroxyl groups. Clay delamination was effectively triggered by the grafting reaction of the growing PLA chains onto the hydroxyl groups. Aluminium triisopropoxide, triethylaluminium, and stannous octoate, as initiating or co-initiating species, were compared in terms of polymerization control. The influence of nanoclay content (from 1 to 10 wt.-% in inorganics) on morphology and thermal behavior was also studied. In parallel, a highly filled nanocomposite (called masterbatch), prepared by in situ polymerization, was dispersed into a (plasticized) preformed polylactide matrix in the molten state, to reach a better clay delamination than that obtained by direct melt blending. Finally, L-,L-lactide and alpha,w-dihydroxylated poly(ethylene glycol) (PEG 1000) were copolymerized in presence of clay in order to study the behavior of the resulting triblocks towards nanocomposite formation. [less ▲]

Detailed reference viewed: 20 (0 ULg)
Full Text
See detailPlate Forme Multi Acteurs (PMA) : quel degré d’appropriation de l’approche par les acteurs dans les bas-fonds de « Sissiotan (Houéyogbé ) et de Kossou-Togba (Dogbo) »
Dossouhoui, François Vihôdé ULg; Kinha, Christophe

Conference (2010, December 07)

Le projet RAP est mis en œuvre selon un processus multi-acteurs (PMA). La PMA constitue un cadre de concertation de plusieurs acteurs : producteurs, transformateurs, commerçants, pisciculteurs, éleveurs ... [more ▼]

Le projet RAP est mis en œuvre selon un processus multi-acteurs (PMA). La PMA constitue un cadre de concertation de plusieurs acteurs : producteurs, transformateurs, commerçants, pisciculteurs, éleveurs, structures d’appui, Partenaires Techniques et financiers, etc. Les intérêts de ces acteurs sont très souvent divergents. Mais, ces acteurs sont appelés à apprendre, agir, et innover ensemble dans une approche systémique pour une utilisation optimale et une gestion durable des ressources naturelles de ces bas-fonds. Après deux années de mise en œuvre de cette approche, nous évaluions le niveau d’appropriation par les acteurs. Les conditions de mobilisation des ressources humaines et financières pour la concrétisation de cette innovation ont été évaluées de même que les actions qui ont été mises en œuvre dans le processus d’ancrage de ce partenariat. Les acquis, les faiblesses et les contraintes à l’appropriation ont fait l’objet d’une analyse critique. En somme, les PMA sont en construction et il existe de réelles motivations autour de cette approche. [less ▲]

Detailed reference viewed: 46 (4 ULg)
See detailDas Plateau des Kammer- und Aortenpules
Fredericq, Léon ULg

in Zentralblatt für Physiologie (1893)

Detailed reference viewed: 3 (0 ULg)
Full Text
See detailLa plateforme ExAMS, un "assessment management system" pour instrumenter la construction et la gestion qualité des évaluations des apprentissages
Gilles, Jean-Luc ULg; Detroz, Pascal ULg; Crahay, Vinciane ULg et al

in Blais, Jean-Guy (Ed.) Evaluation des apprentissages et technologie de l'information et de la communication - Tome 2 (2011)

Detailed reference viewed: 194 (32 ULg)
Full Text
See detailPlateforme interactive utilisée comme outil diagnostique et de remédiation adapté aux grandes populations étudiantes suivant un cours de physique
Marique, Pierre-Xavier ULg; Hoebeke, Maryse ULg

Conference (2014, May 01)

La réforme des études de médecine introduite en 2012 en Communauté Française (Belgique) a fortement modifié les programmes de cours, entre autres celui de physique, pour lequel certaines notions sont ... [more ▼]

La réforme des études de médecine introduite en 2012 en Communauté Française (Belgique) a fortement modifié les programmes de cours, entre autres celui de physique, pour lequel certaines notions sont désormais considérées comme prérequises. Conscientes que celles-ci ne sont pas toujours acquises par les étudiants, les équipes pédagogiques de l'ULg ont élaboré des systèmes de remédiation. Un espace en ligne a notamment été développé, parallèlement au cours présentiel (cours ex-cathedra, répétitions et laboratoires), afin de permettre aux enseignants et aux étudiants d'évaluer les difficultés et lacunes de ces derniers et d’y remédier. Cet outil est conçu pour offrir une aide spécifique adaptée à chacun malgré le nombre important d’étudiants inscrits (800 en 2013). Ils peuvent y travailler, de manière progressive et autonome, les aspects théoriques (notes et tests formatifs) et pratiques (exercices, problèmes décomposés ou non). Des tests diagnostiques en début et fin de parcours permettent aux apprenants d’apprécier leur évolution. De plus, la plate-forme centralise différents outils interactifs (forums, calendrier, annonces, …) accompagnant l’étudiant dans l’organisation de son apprentissage. Les premières analyses de traces indiquent une corrélation entre travail en ligne et réussite. Une adaptation progressive de l’outil sera basée sur l’analyse des résultats et du ressenti de étudiants. [less ▲]

Detailed reference viewed: 24 (5 ULg)
Full Text
See detailLa plateforme Open-source ExAMS : une approche qualité pour le testing standardisé
Gilles, Jean-Luc ULg; Detroz, Pascal ULg; Crahay, Vinciane ULg et al

in Chafiqi, Fouad (Ed.) Mondialisation et éducation - Vers une société de la connaissance. Recueil des résumés des conférences et des communications (tome I) (2008)

Detailed reference viewed: 353 (70 ULg)
Full Text
Peer Reviewed
See detailPlatelet adhesion receptors do not modulate infarct volume after a photochemically induced stroke in mice.
Frederix, Kim ULg; Chauhan, Anil K; Kisucka, Janka et al

in Brain Research (2007), 1185

Photochemically induced cerebral infarction has been considered a clinically relevant model for ischemic stroke. We evaluated various transgenic mice to study the role of platelet adhesion molecules in ... [more ▼]

Photochemically induced cerebral infarction has been considered a clinically relevant model for ischemic stroke. We evaluated various transgenic mice to study the role of platelet adhesion molecules in this model. Infarction to the sensorimotoric cortex was induced by erythrosin B and laser light. Infarct volumes were calculated from triphenyltetrazolium chloride stained brain slices. Thrombus formation and vessel leakage were observed in vivo by multiphoton microscopy. Mice mutant in VWF, GPIbalpha, beta3 integrin, and P-selectin did not show any significant differences in infarct volume compared to wild type (WT). This is in contrast to the intraluminal middle cerebral artery occlusion model in which alphaIIbbeta3 integrin, GPIbalpha, and P-selectin are known to modulate infarct size. Multiphoton microscopy showed that small, non-occlusive embolizing platelet thrombi formed in the photochemically injured brains. Massive vessel leakage was observed within 25 min of laser injury. Interestingly, we observed a significant increase in infarct size with aging, accordant with heightened fragility of the blood brain barrier (BBB) in older mice. This model of photochemically induced stroke is closer to a BBB injury model than a thrombotic stroke model in which platelets and their adhesion molecules are crucial. This model will be useful to study mechanisms regulating BBB permeability. [less ▲]

Detailed reference viewed: 22 (1 ULg)
Full Text
Peer Reviewed
See detailThe platelet ATP and ADP receptors.
Oury, Cécile ULg; Toth-Zsamboki, Emese; Vermylen, Jos et al

in Current Pharmaceutical Design (2006)

This review focuses on recent findings on the physiology of these platelet ADP and ATP receptors, their distinct downstream intracellular signaling pathways as well as on the available agonists ... [more ▼]

This review focuses on recent findings on the physiology of these platelet ADP and ATP receptors, their distinct downstream intracellular signaling pathways as well as on the available agonists, antagonists and inhibitors that allow their pharmacological discrimination. [less ▲]

Detailed reference viewed: 25 (1 ULg)
Full Text
Peer Reviewed
See detailPlatelet expression of non-functional P2X1delL ion channels in mice reduces arterial thrombosis
Oury, Cécile ULg; Daenens, Kim; Feijge, Marion et al

in Haematologica (2004)

Detailed reference viewed: 12 (2 ULg)
See detailThe platelet purinergic receptors
Oury, Cécile ULg; Hoylaerts, Marc

Book published by Leuven University Press (2003)

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailPlatelet reactivity and cardiovascular events after percutaneous coronary intervention in patients with stable coronary artery disease: the Stent Thrombosis In Belgium (STIB) trial
LEGRAND, Victor ULg; CUISSET, T; CHENU, P et al

in EuroIntervention : Journal of EuroPCR in Collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology (2014), 10

PR measured before PCI in stable patients undergoing elective PCI who are preloaded with 500 mg of aspirin and 600 mg of clopidogrel is not predictive of periprocedural myocardial injury or adverse ... [more ▼]

PR measured before PCI in stable patients undergoing elective PCI who are preloaded with 500 mg of aspirin and 600 mg of clopidogrel is not predictive of periprocedural myocardial injury or adverse ischaemic complications up to 30 days. [less ▲]

Detailed reference viewed: 5 (1 ULg)
Full Text
Peer Reviewed
See detailPlatelet rich plasma : traitement des tendinopathies chroniques ?
Kaux, Jean-François ULg; Degrave, Nadia ULg; Crielaard, Jean-Michel ULg

in Journal de Traumatologie du Sport (2007), 24(2), 99-102

Introduction. – Some tendinopathies become chronic in spite of an appropriate treatment. Further treatment with an injection of platelet rich plasma (PRP) can avoid surgical intervention. Ephemesis. – We ... [more ▼]

Introduction. – Some tendinopathies become chronic in spite of an appropriate treatment. Further treatment with an injection of platelet rich plasma (PRP) can avoid surgical intervention. Ephemesis. – We have made a review of literature concerning the PRP. Its efficacy is due to growth factors contained in platelets which are from 300 to 500 times more concentrated after preparation than in blood. The use of PRP has good results in different medical disciplines and can heal tendons in vitro studies. However, only one clinical study reports a good efficacy of PRP in the treatment of epicondylitis. Conclusion. – PRP is an interesting technique to treat chronic tendinopathies but there are not enough studies to determine its real efficacy. [less ▲]

Detailed reference viewed: 228 (46 ULg)
Full Text
Peer Reviewed
See detailPlatelet-rich plasma (PRP) and tendon healing: animal model
Kaux, Jean-François ULg; Drion, Pierre ULg; Renouf, Julien et al

in British Journal of Sports Medicine (2011, February), 45(2), 1

Introduction: The tendon is a tissue which does not heal easily. Recently, several studies have demonstrated the positive effects of platelets on the healing process of tendons. A local injection of ... [more ▼]

Introduction: The tendon is a tissue which does not heal easily. Recently, several studies have demonstrated the positive effects of platelets on the healing process of tendons. A local injection of platelet–rich plasma (PRP), which releases in situ many growth factors, has the potentiality to enhance the tendon healing process. The aim of our experiment was to ascertain by an original mechanical measure whether the use of PRP was of interest for accelerating the healing process of rats’ Achilles tendons after surgical induced lesion. Methods: A 5mm defect was surgically induced in 90 rats’ Achilles tendon. Rats were divided into 2 groups of 45: (A) control (no treatment) and (B) PRP treatment. Rats of group B received a PRP injection in situ after the surgery. Afterwards, rats of both groups were placed in their cages without immobilization. After 5, 15 and 30 days, 10 traumatized Achilles tendons of each group were dissected and removed. Immediately after sampling, tendons were submitted to a biomechanical tensile test up to rupture, using a “Cryo-jaw”. After that, transcriptomic analyses were made on the tendon samples, to study the expression of type III collagen, matrix metalloproteases and tenomodulin. A hydroxyproline dosage was done to quantify the collagen in the tendon during its healing process. Tendons of the 15 remaining rats of each group were subjected to a histological study, respectively at day 5, 15 and 30 (5 rats for each time). Results: We demonstrated that the force necessary to induce tendon rupture during biomechanical tensile test study was greater for tendons which had been submitted to an injection of PRP compared to the control group: +19% (day 5), +30% (day 15) and +43% (day 30). Histological study showed that PRP could enhance cells proliferation, angiogenesis and collagen organisation. Our biochemical analyses did not explain beneficial effects of PRP. Indeed, there was no significant difference neither between the expression of different studied genes, nor in the quantity of hydroxyproline between both groups. Conclusion: This experimentation has shown that a PRP injection could accelerate the tendons healing process and improve its quality. [less ▲]

Detailed reference viewed: 127 (23 ULg)
Full Text
Peer Reviewed
See detailPlatelet-rich plasma (PRP) increases healing process of rats' Achilles tendons
Kaux, Jean-François ULg; Drion, Pierre ULg; Pascon, Frédéric ULg et al

Conference (2010, March 20)

Introduction Some tendinopathies (epicondylitis, jumper’s knee or Achilles tendinopathy) are frequently considered as rebel to “classic” treatments such as rest, orthotics, NSAIs, electrotherapy ... [more ▼]

Introduction Some tendinopathies (epicondylitis, jumper’s knee or Achilles tendinopathy) are frequently considered as rebel to “classic” treatments such as rest, orthotics, NSAIs, electrotherapy, physiotherapy, corticosteroid infiltrations, extracorporeal shock waves… Recently, several studies, essentially in vitro, demonstrated the positive effects of platelets on the healing process of different tissues: bones, muscles and tendons. Objectives The aim of our experiment was to ascertain whether the use of platelet-rich plasma (PRP) was of interest for accelerating the healing process of Achilles tendon after surgical induced lesion. Methods A 5mm defect was surgically induced in rat Achilles tendon after resection of plantaris tendon. Rats were divided into 2 groups: A: control (no injection) and B: PRP injection. Rats of group B received a PRP injection in situ after the surgery. Afterwards, rats of both groups were placed in their cage without immobilization. After 5, 15 and 30 days, rats were euthanized. The traumatized Achilles tendon of each rat was removed and dissected during this healing process. Immediately after sampling, tendons were submitted to a biomechanical tensile test up to rupture, using a “Cryo-jaw”. Results We demonstrated that the force necessary to induce tendon rupture during biomechanical tensile test study was more important for tendons which had been submitted to an injection of PRP. These results were noticed from day 5 onwards. Discussion – Conclusion This experimentation has shown that PRP injections could accelerate tendons healing process and increase the force needed to break tendons in their healing process. This “accelerating” process can be observed as early as day 5. Acknowledgement This experimentation was partially financed by “Standard de Liège 2007” and “Lejeune-Lechien 2008” grants. [less ▲]

Detailed reference viewed: 136 (37 ULg)
Full Text
Peer Reviewed
See detailPlatelet-rich plasma (PRP) to treat chronic upper patellar tendinopathies
Kaux, Jean-François ULg; Croisier, Jean-Louis ULg; Bruyère, Olivier ULg et al

in British Journal of Sports Medicine (2013, July), 47(10 (e3)), 15

Background: Upper patellar tendinopathies remain often chronic and rebel to a thorough conservative treatment. Moreover, the option of a surgical treatment could be disappointing. New treatments are being ... [more ▼]

Background: Upper patellar tendinopathies remain often chronic and rebel to a thorough conservative treatment. Moreover, the option of a surgical treatment could be disappointing. New treatments are being developed. Injection of PRP is one of these. Platelets contain lot of growth factors which would have the potentiality to enhance the healing process of tendons. Even if in vitro and animal experiments have demonstrated this stimulation of tendon healing process1, clinical series are subject to controversy2. Methods: Twenty patients with chronic upper patellar tendinopathy were enrolled. Assessments [VAS, clinical examination with an algometer, algofunctional scores (IKDC and VISA-P), functional assessments (isokinetic and Optojump) and imagery (ultrasounds and MRI)]were made before infiltration of PRP, and 6 weeks and 3 months after. The PRP was obtained by an apheresis system (COM.TEC, Fresenius). Six millilitres of PRP were injected without local anaesthetic. One week after infiltration, patients started a 6-week standardised sub-maximal eccentric reeducation. Results: We observed a very significant improvement of the algofunctional status as soon as 6 weeks after the infiltration of PRP, and continued to a lesser extent up to 3 months. During functional evaluation, pain decreased as well, but without significant improvement of performances. No significant improvements in the imagery were observed. Interestingly, patients who had a VAS equal or below 1 after 3 months post-infiltration were younger (24.7 vs 32.2 y.o.). Moreover, these younger patients had a significant increase of the IKDC score (p=0.003), a significant improvement of pain during isokinetic evaluations (p<0.05), and during Optojump assessments (p=0.01). Seventy-five percent of subjects were able to return to sport, even if only half of these patients recovered the same level than before the tendinopathy. Discussion / Conclusions: This study demonstrates that a local infiltration of PRP associated with a submaximal eccentric protocol is efficient to improve symptoms of chronic upper patellar tendinopathies, non-responsive to classical conservative treatments. However, up to now, there is no consensus on the method to prepare the PRP. Indeed, each technique could provide a very different PRP (variations in the platelet concentrations and of the amount of red and white cells). [less ▲]

Detailed reference viewed: 100 (30 ULg)