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See detailCharacterization of two genes encoding the mitochondrial alternative oxidase in Chlamydomonas reinhardtii
Dinant, Monique; Baurain, Denis ULg; Coosemans, Nadine ULg et al

in Current Genetics (2001), 39(2), 101-108

Two cDNA clones (AOX1 and AOX2) and the corresponding genes encoding the alternative oxidases (AOXs) from Chlamydomonas reinhardtii were isolated and sequenced. The cDNAs, AOX1 and AOX2, contained open ... [more ▼]

Two cDNA clones (AOX1 and AOX2) and the corresponding genes encoding the alternative oxidases (AOXs) from Chlamydomonas reinhardtii were isolated and sequenced. The cDNAs, AOX1 and AOX2, contained open reading frames (ORFs) encoding putative proteins of 360 amino acids and 347 amino acids, respectively. For each of the ORFs, a potential mitochondrial-targeting sequence was found in the 5'-end regions. In comparison to AOX enzymes from plants and fungi, the predicted amino acid sequences of the ORFs showed their highest degree of identity with proteins from Aspergillus niger (38.1% and 37.2%) and Ajellomyces capsulatus (37% and 34.9%). Several residues supposed either to be Fe ligands or to be involved in the ubiquinol-binding site were fully conserved in both C. reinhardtii putative AOX proteins. In contrast, a cysteine residue conserved in the sequences of all higher plants and probably involved in the regulation of the enzyme activity was missing both from the AOX1 and AOX2 amino acid sequences and from protein sequences from various other microorganisms. The transcriptional expression of the AOX1 and AOX2 genes in wild-type cells and in mutant cells deficient in mitochondrial complex III activity was also investigated. [less ▲]

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See detailMorphology and mechanical properties of poly(methylmethacrylate)-b-poly(alkylacrylate)-b-poly(methylmethacrylate)
Tong, J. D.; Leclère, Philippe; Doneux, C. et al

in Polymer (2001), 42(8), 3503-3514

A series of well-defined poly(methylmethacrylate) (PMMA)-b-poly(alkylacrylate)-b-PMMA triblock copolymers (MAM) has been synthesized by transalcoholysis of PMMA-b-poly(tert-butylacrylate)-b-PMMA ... [more ▼]

A series of well-defined poly(methylmethacrylate) (PMMA)-b-poly(alkylacrylate)-b-PMMA triblock copolymers (MAM) has been synthesized by transalcoholysis of PMMA-b-poly(tert-butylacrylate)-b-PMMA precursors by alkyl alcohols. The molecular weight (MW) of the outer PMMA blocks is in the 10,000-50,000 range, compared to 50,000-200,000 for the inner poly(alkylacrylate) block. Phase separation, as studied in direct space by atomic force microscopy, is observed for all the investigated triblock copolymers, except for the PMMA-b-poly(ethylacrylate)-b-PMMA and the PMMA-b-poly(n-propylacrylate)-b-PMMA triblocks of 10,000-50,000-10,000 MW. The ultimate tensile strength measured for the MAM triblocks is strongly dependent on the MW between chain entanglements for the central block. The tensile behavior is however affected by the partial miscibility of the outer and inner blocks when the PMMA MW is low. When this situation prevails, it makes the melt processing possible at temperatures lower than 200°C. [less ▲]

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See detailFace milling and turning simulation with the finite element method
Masset, Luc ULg; Debongnie, Jean-François ULg; Beckers, Pierre ULg

in Habraken, Anne (Ed.) Proceedings of the 4th International ESAFORM Conference on Material Forming (2001, April)

The paper describes a new simulation tool that gives the machined surface error in face milling and turning. The form error component due to the workpiece flexibility is computed using Samcef finite ... [more ▼]

The paper describes a new simulation tool that gives the machined surface error in face milling and turning. The form error component due to the workpiece flexibility is computed using Samcef finite element code. The finite element analyses are very efficient on industrial applications thanks to the superelement method. Results are obtained in a short time which makes possible a wide range of simulations such as finding the best tool trajectory, testing several tools and cutting conditions and choosing the most suited fixture design. [less ▲]

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See detailAcquisition et traitement de l'image
Van Droogenbroeck, Marc ULg

Learning material (2001)

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See detailTendances actuelles en matière de contrôle de gestion : de l'entreprise orientée "produit" à l'entreprise orientée "client"
Van Caillie, Didier ULg

Scientific conference (2001, March 12)

This seminar depicts current trends in the research on management control and explains why there is a clear evolution from a product-oriented perspective towards a client-focused perspective.

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See detailAgriculture et environnement: nitrates, permis d'environnement, écobilan, ...
Debouche, Charles ULg

Scientific conference (2001, March 06)

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See detailAbstract numeration systems on a regular languages and recognizability
Rigo, Michel ULg

Doctoral thesis (2001)

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See detailLa portée spatiale du permis de lotir et sa compatibilité avec les plans d'aménagement
Delnoy, Michel ULg

in Cahiers de l'Urbanisme (Les) (2001), n° spécial

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See detailComment j'explore certains cas difficiles de meningite tuberculeuse
Lemaire, Roger ULg; al Azba, S.; Brumioul, Danielle ULg et al

in Revue Médicale de Liège (2001), 56(3), 181-185

To formally document the presence of the bacillus of Koch in meninges still remains difficult and depends on many variables. We report two cases where the diagnosis proved difficult. The presentation of ... [more ▼]

To formally document the presence of the bacillus of Koch in meninges still remains difficult and depends on many variables. We report two cases where the diagnosis proved difficult. The presentation of tuberculous meningitis can take several aspects. Mantoux reaction is frequently negative. The BK cultures, which demonstrate the diagnosis, depend on the volume of CSF and on the importance of BK dissemination. It, unfortunately, remains difficult to make the diagnosis of tuberculous meningitis even though this pathology can have extremely deleterious consequences. [less ▲]

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See detailLes pénétrations percutanées de fluides projetés sous pression
Beaujean, M.; Thiry, A.; RADERMECKER, Régis ULg

in Journal des Maladies Vasculaires (2001, March), 26(Suppl 1), 153

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See detailPharma clinics. Comment je traite.... L'arthrose. 2eme partie: Nouvelles perspectives therapeutiques
Reginster, Jean-Yves ULg; Henrotin, Yves ULg

in Revue Médicale de Liège (2001), 56(3), 135-9

Besides the management of symptoms of osteoarthritis, a lot of interest was raised for molecules aiming at slowing down the structural progression of the disease. This paper summarizes the currently ... [more ▼]

Besides the management of symptoms of osteoarthritis, a lot of interest was raised for molecules aiming at slowing down the structural progression of the disease. This paper summarizes the currently available data allowing to discuss the efficacy and tolerance of these chemical entities. [less ▲]

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See detailFaut-il faire payer nos journaux d'entreprise ?
Durand, Pascal ULg; Jennes, Catherine

Article for general public (2001)

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See detailProgres recents dans la pharmacologie des hypnotiques et anxiolytiques
Scuvée-Moreau, Jacqueline ULg; Seutin, Vincent ULg

in Revue Médicale de Liège (2001), 56(3), 159-64

Recent studies on the respective contribution of GABAA receptor subunits in the various pharmacological effects of benzodiazepines suggest that the sedative and amnesic properties of diazepam are mediated ... [more ▼]

Recent studies on the respective contribution of GABAA receptor subunits in the various pharmacological effects of benzodiazepines suggest that the sedative and amnesic properties of diazepam are mediated by enhancement of gabaergic transmission in neurons expressing the alpha 1 subunit while the anxiolytic effect is selectively mediated by alpha 2 subunit. These findings suggest that a separation of the pharmacological properties of benzodiazepines is possible and that drugs with increased clinical specificity could be developed. [less ▲]

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See detailControlled exchange of metallic cations by polypyrrole-based resins
Jérôme, Christine ULg; Martinot, Lucien; Strivay, David ULg et al

in Synthetic Metals (2001), 118(1-3), 45-55

Binding and release of various cations by polarization of polypyrrole based exchange-resins has been studied. The reversibility of the process has been investigated by electrochemical and nuclear ... [more ▼]

Binding and release of various cations by polarization of polypyrrole based exchange-resins has been studied. The reversibility of the process has been investigated by electrochemical and nuclear techniques. It clearly depends on both the exchanged-cation and the sulfonated doping-ion. The selectivity of the process has also been analyzed by binding experiments from a mixture of two cations. [less ▲]

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See detailParticle-in-particle morphology for the dispersed phase formed in reactive compatibilization of SAN/EPDM blends
Pagnoulle, Christophe; Jérôme, Robert ULg

in Polymer (2001), 42(5), 1893-1906

Poly(ethylene-co-propylene-co-diene) (EPDM) containing 50 wt% of poly(ethylene-co-propylene) grafted with maleic anhydride (EP-g-MA) has been melt blended with poly(styrene-co-acrylonitrile) (SAN) added ... [more ▼]

Poly(ethylene-co-propylene-co-diene) (EPDM) containing 50 wt% of poly(ethylene-co-propylene) grafted with maleic anhydride (EP-g-MA) has been melt blended with poly(styrene-co-acrylonitrile) (SAN) added with various amounts of reactive SAN, i.e. SAN bearing either primary amine (SAN-NH2) or carbamate groups (SAN-carb). Carbamate groups are precursors of primary amines by thermal thermolysis during melt processing. These reactive systems are good models for studying the effect of the kinetics of the interfacial reaction on the phase morphology. Reaction of maleic anhydride with the primary amine is indeed very fast, at high temperature, in contrast to the reaction with carbamate, which is controlled by the carbamate thermolyis into primary amine. Special attention has been paid to the experimental conditions required for the development of the particle-in-particle morphology for the dispersed phase. Depending on the mixing sequence and the grafting kinetics (NH2/MA versus carb/MA), this particular phase morphology can be forced or occurs spontaneously. [less ▲]

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See detailPremade versus in situ formed compatibilizer at the PS/PMMA interface: contribution of the Raman confocal microscopy to the fracture analysis
Koulic, Christian; Yin, Zhihui; Pagnoulle, Christophe et al

in Polymer (2001), 42(7), 2947-2957

The interface of a two-layer assembly of polystyrene (PS) and poly(methyl methacrylate) (PMMA) was modified by an intermediate layer of either a premade poly(styrene-g-methyl methacrylate) copolymer (P(S ... [more ▼]

The interface of a two-layer assembly of polystyrene (PS) and poly(methyl methacrylate) (PMMA) was modified by an intermediate layer of either a premade poly(styrene-g-methyl methacrylate) copolymer (P(S-g-MMA)) or a preblend of mutually reactive PS and PMMA synthesized by atom transfer radical polymerization (ATRP). No significant difference was found in the interfacial fracture toughness measured by the double cantilever beam test, although the morphology of the interfacial region was not the same when observed by transmission electron microscopy. The premade copolymer formed a distinct interphase, in contrast to the sharp interface that was observed in the case of the reactive system. The analysis of the fracture surfaces by Raman confocal microscopy showed that the fracture occurred alternatively in the PS phase and either at the PS/copolymer interface for the non reactive system or at the PS/PMMA interface for the reactive one. [less ▲]

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See detailQualitative Comparison between the Quantum Calculations and Electrospray Mass Spectra of Complexes of Polyammonium Macrotricyclic Ligands with Dicarboxylic Acids
Collette, Caroline ULg; Dehareng, Dominique ULg; De Pauw, Edwin ULg et al

in Journal of the American Society for Mass Spectrometry (2001), 12(3), 304-16

The host-guest interactions play a very important role in chemical and biological processes. It is therefore important to be able to characterize these complexes. Electrospray mass spectrometry can be ... [more ▼]

The host-guest interactions play a very important role in chemical and biological processes. It is therefore important to be able to characterize these complexes. Electrospray mass spectrometry can be used to characterize the complex formation. It provides information on the mass and the charge of these ionic complexes. In this article, we show that the use of ab initio and semiempirical calculations, in addition to the results obtained by electrospray mass spectrometry, reveal to be a promising tool for the study of these noncovalent complexes. In this article, host-guest complexes formed by macropolycyclic polyammonium host molecules and dicarboxylic acids are studied. [less ▲]

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See detailConsistency of stress smooting by convolution
Debongnie, Jean-François ULg; Beckers, Pierre ULg

Conference (2001, March)

A convolution process is presented in order to smoothen finite element stresses. A comprehensive analysis leads to the fact that a pertinent choice of the convolution kernel has to be done, as consistency ... [more ▼]

A convolution process is presented in order to smoothen finite element stresses. A comprehensive analysis leads to the fact that a pertinent choice of the convolution kernel has to be done, as consistency conditions have to be satisfied. Such kernels are then presented. [less ▲]

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