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See detailPreparation of supported yttrium alkoxides as catalysts for the polymerization of lactones and oxirane
Martin, Eric; Dubois, Philippe ULg; Jérôme, Robert ULg

in Journal of Polymer Science. Part A, Polymer Chemistry (2003), 41(4), 569-578

Two methods have been reported that allow yttrium alkoxides to be supported on porous silica and to be used afterward as heterogeneous catalysts in the ring-opening polymerization of oxirane and e ... [more ▼]

Two methods have been reported that allow yttrium alkoxides to be supported on porous silica and to be used afterward as heterogeneous catalysts in the ring-opening polymerization of oxirane and e-caprolactone. In the two methods, [tris(hexamethyldisilyl)-amide]yttrium [Y[N(SiMe3)(2)](3)} is the metal alkoxide precursor. It is directly reacted with the silanol groups of the support, in the first method, and this is followed by alcoholysis of the unreacted amide groups. The flexibility of this method seems to be limited because the grafting density and the structure of the grafted Y alkoxide (less than one alkoxide by metal) are independent of the experimental conditions. In the second method, Y[N(SiMe3)(2)](3) is first reacted with 1 or 2 equiv of alcohol with the formation of the mixed Y alkoxide/amide. The amide functions are used to attach Y to the support. This method is free from side reactions, quite reproducible, and well suited to support one type of active species (monoalkoxide or dialkoxide). Preliminary experiments with e-caprolactone polymerization have confirmed the activity of the supported Y alkoxide, whatever preparation method is used. (C) 2003 Wiley Periodicals, Inc. [less ▲]

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See detailPreparation of well-defined PVOH/C60 nanohybrids by cobalt-mediated radical polymerization of vinyl acetate
Detrembleur, Christophe ULg; Stoilova, Olya; Bryaskova, Rayna ULg et al

in Macromolecular Rapid Communications (2006), 27(7), 498-504

Poly(vinyl acetate) chains end-capped by a Co(acac)(2) complex [PVAc-Co(acac)(2)] were prepared by bulk cobalt-mediated radical polymerization (CMRP) of vinyl acetate and used for grafting fullerene (C60 ... [more ▼]

Poly(vinyl acetate) chains end-capped by a Co(acac)(2) complex [PVAc-Co(acac)(2)] were prepared by bulk cobalt-mediated radical polymerization (CMRP) of vinyl acetate and used for grafting fullerene (C60) with four PVAc arms at low temperature (30 degrees C). A photoactive water-soluble poly(vinyl alcohol)/C60 nanohybrid was then prepared by hydrolysis of the PVAc arms of the nanohybrid. Because of photoactivity and very low cytotoxicity, this type of water-soluble nanohybrid is very promising for the photodynamic cancer therapy. [less ▲]

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See detailPreparation of YBa2Cu3O7-x superconducting thick films by the electrophoretic deposition method
Dusoulier, Laurent; Denis, Samuel ULg; Vanderbemden, Philippe ULg et al

in Journal of Materials Science (2006), 41(24), 8109-8114

YBa2Cu3O7-x thick films have been realised by the Electrophoretic Deposition method (EPD). The influence of several parameters (powder and iodine concentrations in the suspension, applied voltage and ... [more ▼]

YBa2Cu3O7-x thick films have been realised by the Electrophoretic Deposition method (EPD). The influence of several parameters (powder and iodine concentrations in the suspension, applied voltage and deposition time) on the EPD process has been studied by measuring the conductivity of the suspension and the amount of YBa2Cu3O7-x particles deposited on the electrode. Superconducting coatings onto silver substrates have been produced by a multilayer process during different deposition times. The highest critical current density value of these coatings measured by the four-point probe method is about 10^3 A/cm^2 (77 K), in a suitable range for magnetic shielding applications. [less ▲]

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See detailPreparation preoperatoire et surveillance postoperatoire d'un patient atteint d'oedeme angioneurotique hereditaire.
Joris, Jean ULg; Lamy, Maurice ULg

in Annales Françaises d'Anesthésie et de Réanimation (1986), 5(3), 312-4

Hereditary angioneurotic oedema is an autosomal dominant disorder associated with serum deficiency of functionally active C1 inhibitor protein. This decrease is characterized by episodic swelling of ... [more ▼]

Hereditary angioneurotic oedema is an autosomal dominant disorder associated with serum deficiency of functionally active C1 inhibitor protein. This decrease is characterized by episodic swelling of subcutaneous tissues, of abdominal viscera and of the upper airway. Attacks of angioneurotic oedema, sometimes fatal when involving the upper airway, can occur during any surgery. It is therefore necessary to prepare affected patients before surgery. This review article describes the various preventive treatments used to avoid attacks during surgery: antifibrinolytic agents, androgens, fresh frozen plasma, C1 esterase inhibitor concentrate. Preoperative management of one patient with angioneurotic oedema using danazol and C1 esterase inhibitor concentrate is reported. [less ▲]

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See detailPreparation process of a supported catalyst for producing carbon nanotubes
Prada Silvy, Ricardo; LIEGEOIS Fanny; Culot Bénédicte et al

Patent (2006)

Synthesis of a catalyst (I) for the manufacture of multi-wall and nanotubes comprises mixing aluminum hydroxide powder (Ia) (80 mu m) with an aqueous iron (Ib) and cobalt salt solution (Ic) to form a ... [more ▼]

Synthesis of a catalyst (I) for the manufacture of multi-wall and nanotubes comprises mixing aluminum hydroxide powder (Ia) (80 mu m) with an aqueous iron (Ib) and cobalt salt solution (Ic) to form a paste, drying the paste to a powder with a water content (which is lower than 5 wt.%) and selecting a particle shape lower than 70 mu m. [less ▲]

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See detailPréparation, caractérisation et réactivité de l'acide 1-vanado-11-molybdo-phosphorique supporté sur des matériaux silicatés mésoporeux dans l'oxydation du propène
Benadji, S.; Eloy, P.; Léonard, Alexandre ULg et al

in Comptes Rendus Chimie (2012), 15(8), 658-668

The H 4PMo 11VO 40 heteropolyacid (HPA) was supported at 30 wt.% by the dry impregnation method on HMS, CMI-1 and SBA-15 mesoporous materials. The state of the HPA and those of the supports were examined ... [more ▼]

The H 4PMo 11VO 40 heteropolyacid (HPA) was supported at 30 wt.% by the dry impregnation method on HMS, CMI-1 and SBA-15 mesoporous materials. The state of the HPA and those of the supports were examined by nitrogen physisorption, X-ray diffraction, (DR) FT-IR and X-ray photoelectron spectroscopies, thermal analysis (TG-ATD) and scanning electron microscopy (SEM). The effect of support on the catalytic behavior of H 4PMo 11VO 40 was studied in the propene oxidation at 350 °C. It was shown that the presence of H 4PMo 11VO 40, modifies the textural properties of mesoporous materials (decrease of surface area) without destroying their structure. The interaction support-heteropolyacid leads to the formation of (SiOH 2+)(H 3PMo 11VO 40 -) surface species more stable than H 4PMo 11VO 40 species and that appear to be the active sites in the propene oxidation. © 2012 Published by Elsevier Masson SAS on behalf of Academie des sciences. [less ▲]

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See detailPreparation, characterization and in vitro release properties of ibuprofen-loaded microspheres based on polylactide, poly(epsilon-caprolactone) and their copolymers
Zhu, K. J.; Li, Y.; Jiang, H. L. et al

in Journal of Microencapsulation (2005), 22(1), 25-36

In this paper, ibuprofen was encapsulated into microspheres by oil-in-water (o/w) emulsion solvent evaporation method. Biodegradable polymers with certain compositions and characteristics such as ... [more ▼]

In this paper, ibuprofen was encapsulated into microspheres by oil-in-water (o/w) emulsion solvent evaporation method. Biodegradable polymers with certain compositions and characteristics such as polylactide (PLA), poly(epsilon-caprolactone) (PCL) and their block copolymer were used to prepare the microspheres. The results indicate that, under the same processing conditions, the drug entrapment efficiency was similar (similar to 80%) for microspheres prepared with PLA and P(LA-b-CL) (78.7/21.3 by mole), but it was only 25.4% for PCL microspheres. The in vitro drug release rate decreased in the order of PCL, P(LA-b-CL) (78.7/21.3 by mole) and PLA microspheres. PCL microspheres showed more serious burst release during the first day (almost 80%) than P(LA-b-CL) (50%) and PLA microspheres (18%). The complete ibuprofen release duration from the last two kinds of microspheres exceeded I month. Characterization of the microspheres by differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and polarized optical microscope (POM) revealed that ibuprofen was amorphous in PCL microspheres and partially crystalline in P(LA-h-CL) and PI-A microspheres. The different release behaviour of ibuprofen from the three kinds of microspheres could be attributed to the different crystallinity of the studied polymers and drug dispersion state in polymer matrices. All the above results suggest that the copolymer with a certain ratio of lactide to epsilon-caprolactone could have potential applications for long-term ibuprofen release. [less ▲]

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See detailPreparation, characterization, and in vitro degradation of bioresorbable and bioactive composites based on Bioglass (R)-filled polylactide foams
Maquet, Véronique; Boccaccini, Aldo R.; Pravata, Laurent et al

in Journal of Biomedical Materials Research, Part A (2003), 66A(2), 335-346

Highly porous poly(D,L-lactide)/Bioglass composites scaffolds were prepared by thermally induced phase separation process of polymer solutions and subsequent solvent sublimation. A series of composite ... [more ▼]

Highly porous poly(D,L-lactide)/Bioglass composites scaffolds were prepared by thermally induced phase separation process of polymer solutions and subsequent solvent sublimation. A series of composite foams with different polymer/Bioglass weight ratios was prepared to study the influence of Bioglass content on the foam characteristics such as porous structure, density, and pore volume. The pore volume was decreased from 9.5 to 5.7 cm(3)/g when the Bioglass content was increased up to 40 wt %, but the overall pore morphology was not affected very much by changing the polymer/glass composition ratio. The composites foams were then incubated in phosphate-buffered saline at 37 degrees C to study the in vitro degradation of the polymer and to detect hydroxyapatite (HA) formation as an indication of their bioactivity. The addition of Bioglass to polymer foams increased the water absorption and weight loss as compared with pure polymer foams. However, the polymer molecular weight, determined by size exclusion chromatography, was found to decrease more rapidly and to a larger extent in absence of Bioglass. This delayed degradation rate in the composite foams was probably caused by the dissolution of alkaline ions from the Bioglass, resulting in a buffering effect of the incubation medium. After incubation for 7 days, HA was detected by X-ray diffractometry and Raman spectroscopy and confirmed by environmental scanning electron microscopy and energy-dispersive X-ray analysis. The porous composites developed here are promising materials for bone regeneration applications because the formation of HA on the surface of the pore walls should provide good environment for the adhesion and proliferation of osteoblasts and osteoprogenitor cells. [less ▲]

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See detailPreparations and characterisations of semi-solid formulations containing a hydrophilic drug for vaginal administration
Coia, Isabelle ULg; Evrard, Brigitte ULg; Piette, Marie ULg

Poster (2009, April 01)

The purpose of this study is to demonstrate the effect of different types of semi-solid formulations (aqueous gels, liquid jellified emulsions and hydrophilic or lipophilic creams) for vaginal ... [more ▼]

The purpose of this study is to demonstrate the effect of different types of semi-solid formulations (aqueous gels, liquid jellified emulsions and hydrophilic or lipophilic creams) for vaginal administration on the release kinetic of a hydrophilic drug. This drug is an acidic and hydrophilic (log P (octanol/water) = -3.3) molecule with an aqueous solubility upper than 170mg/ml at pH 6-8. The formulations characterisations consisted in the in vitro evaluation of the drug release kinetic and the measure of all formulations viscosity as well as the creams stability and emulsions droplets size. [less ▲]

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See detailPreparative enzymatic synthesis and in situ regeneration of nucleotide sugars with sucrose synthase
Zervosen, Astrid ULg; Stein, Andreas; Elling, Lothar

Conference (1995, July)

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See detailPreparative resolution of racemic pirlindole: chromatographic methods and determination of the absolute configuration
De Tullio, Pascal ULg; Ceccato, A.; Liégeois, Jean-François ULg et al

in European Journal of Pharmaceutical Sciences (1998), suppl.1

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See detailPreparing new regulatory guidelines: the role of the Group for the Respect of Ethics and Excellence in Science (GREES)
Reginster, Jean-Yves ULg

in Annals of the Rheumatic Diseases (2010, June), 69(Suppl.3), 42

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See detailPrepartum management of severe preeclampsia
Brichant, Jean-François ULg

Conference (2004, December 11)

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See detailPrerequisites for a Black locust genomic selection program
Verdu, Cindy ULg; Mengal, Coralie ULg; Henrotay, Frédéric ULg et al

Poster (2014, February 07)

The use of renewable resources as an alternative to fossil fuels has become a priority. Efficient use of forest as a resource for energy and green chemistry purposes require the development of suitable ... [more ▼]

The use of renewable resources as an alternative to fossil fuels has become a priority. Efficient use of forest as a resource for energy and green chemistry purposes require the development of suitable selected genotypes that are competitive and ready to meet the challenges of global change. In this context, the black locust, Robinia pseudoacacia L., is a very promising species which has many advantages in the context of current global change: high phenotypic plasticity, drought resistance, high biomass production and fixation of atmospheric nitrogen. The genetic improvement of woody species using traditional methods can take between 20 to 30 years. These times can be greatly reduced with the development of new selection methods such as genomic selection. Before starting a genomic selection program, it is necessary to 1) develop new molecular markers to achieve a very dense genetic map for genomic selection, 2) study the genetic diversity of the species present in Belgium and compare it with that of the native area, 3) study the structure and the relatedness of different populations, 4) establish a core collection gathering the most genetically diverse individuals, and 5) as black locust is an exotic species, verify its invasiveness in Belgium. These 5 steps will be detailed and the first results obtained will be discussed. [less ▲]

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See detailPrerequisites for the implementation of a new heroin-assisted centre
Demaret, Isabelle ULg

Conference (2010, May 28)

Prerequisites for the implementation of a new heroin-assisted centre Background: TADAM, a randomised controlled trial of heroin-assisted treatment, will begin in Liège, Belgium, in 2010. Heroin-assisted ... [more ▼]

Prerequisites for the implementation of a new heroin-assisted centre Background: TADAM, a randomised controlled trial of heroin-assisted treatment, will begin in Liège, Belgium, in 2010. Heroin-assisted treatment of treatment resistant heroin addicts has been successfully tested in six countries: Switzerland, The Netherlands, Spain, Germany, Canada and United-Kingdom. Each country used a randomised controlled trial to assess this new treatment. It has now a strong evidence-based foundation. However in the peer-reviewed articles, there is little information on the concrete conditions to fulfil before implementing this treatment. With the experience of the other countries and ours, we have listed those conditions. Methodology: We collected information concerning the randomised controlled trial. This included articles published in international peer-review journals, reports, visits to heroin-assisted treatment centres and information given by researchers who participated in those experiments. We will illustrate our presentation with the example of Liège. Results: Before all, a political agreement at the national level is mandatory. It is never guaranteed even if it was already given in the past. Methadone treatments must be available and the collaboration with the addiction network will be an advantage for the project. There must be a sufficiently high number of heroin addicted in the concerned area and they must be correctly informed about the heroin-assisted treatment. But even if it is the case, the inclusion of the foreseen number of patients can be more difficult than expected because it is problematic to assess the exact number of patients fulfilling the inclusion criteria and because not all the eligible participants will accept to enter this treatment. Conclusion: For reasons other than medical or scientific ones, implementing a new heroin-assisted centre is still a challenge. [less ▲]

Detailed reference viewed: 14 (1 ULg)