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See detailImportance of risk stratification models in cardiac surgery
Kolh, Philippe ULg

in European Heart Journal (2006), 27(7), 768-769

This editorial refers to 'Comparison of 19 pre-operative risk strati. cation models in open-heart surgery'dagger by J. Nilsson et al., on page 867.

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See detailThe importance of short-term memory for order in dissociating short-term memory and language deficits
Attout, Lucie ULg; VAN DER KAA, Marie-Anne ULg; GEORGE, Mercédès ULg et al

Poster (2011, May 27)

Selective verbal short-term memory (STM) deficits are rare, and when they appear, they are often associated with a history of aphasia, raising doubts about the selectivity of these deficits. We explore ... [more ▼]

Selective verbal short-term memory (STM) deficits are rare, and when they appear, they are often associated with a history of aphasia, raising doubts about the selectivity of these deficits. We explore here the distinction between STM for item information and STM for order information to separate STM and language impairments. Recent models of STM consider that STM for item information depends upon activation of the language system, and hence item STM deficits should be associated with language impairment. By contrast, STM for order information is considered to recruit a specific system, distinct from the language system. In this view, order STM should be impaired in patients with STM deficits that cannot be accounted for by language impairment. We applied this rationale to the exploration of STM profiles of patients MB and CG. Patient MB showed mild phonological impairment and associated STM deficits. As predicted, these were characterized by poor item STM but preserved order STM. Patient CG showed verbal STM deficits with no associated language deficits. His STM deficit was characterized by poor order STM but relatively preserved item STM. This study presents the first double dissociation between item and order STM deficits, demonstrating the necessity of this distinction for understanding selective STM impairment. [less ▲]

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See detailImportance of social companionship in the determination of health-related quality of life in hip and knee osteoarthrits
Ethgen, Olivier ULg; Van Parijs, P.; Delhalle, S. et al

in Arthritis and Rheumatism (2001), 44(Suppl.1), 183

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See detailImportance of social companionship in the determination of health-related quality of life in hip and knee osteoarthrits
Ethgen, Olivier ULg; Van Parijs, P.; Delhalle, S. et al

in Clinical Rheumatology (2001), 5(Suppl.1), 413

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See detailImportance of social companionship in the determination of health-related quality of life in hip and knee osteoarthrits
Ethgen, Olivier ULg; Van Parijs, P.; Delhalle, S. et al

in Osteoarthritis and Cartilage (2001), 9(Suppl.B), 19-20

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See detailImportance of soft solution processing for advanced BaZrO3 materials
Robertz, B.; Boschini, Frédéric ULg; Cloots, Rudi ULg et al

in International Journal of Inorganic Materials (2001), 3(8), 1185-1187

Barium zirconate is an interesting material for refractory applications as well as a good substrate for the manufacturing of high temperature superconductors. However, its solid state synthesis requires ... [more ▼]

Barium zirconate is an interesting material for refractory applications as well as a good substrate for the manufacturing of high temperature superconductors. However, its solid state synthesis requires high temperature and provides inhomogeneous powder with a broad particle size distribution. In order to avoid these disadvantages, soft solution routes are of growing importance in the ceramic powder synthesis. Precipitation. decomposition of precursors, combustion techniques offer alternative ways to the solid state method. Advantages of these are a lower calcination temperature, production of homogeneous and fine monodisperse powders. The obtained powders have been characterised by XRD, IR, SEM and DTA/TG analysis. The influence of the synthesis conditions on the properties of BaZrO3 has been studied. (C) 2001 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailImportance of steroid receptor coactivators in the modulation of steroid action on brain and behavior
Charlier, Thierry ULg

in Psychoneuroendocrinology (2009), 34

Steroid receptors such as estrogen and androgen receptors are nuclear receptors involved in the transcriptional regulation of a large number of target genes. Steroid-dependent protein expression in the ... [more ▼]

Steroid receptors such as estrogen and androgen receptors are nuclear receptors involved in the transcriptional regulation of a large number of target genes. Steroid-dependent protein expression in the brain controls a large array of biological processes including spatial cognition, copulatory behavior and neuroprotection. The discovery of a competition, or squelch- ing, between two different nuclear receptors introduced the notion that common cofactors may be involved in the modulation of transcriptional activity of nuclear receptors. These cofactors or coregulatory proteins are functionally divided into coactivators and corepressors and are involved in chromatin remodeling and stabilization of the general transcription machinery. Although a large amount of information has been collected about the in vitro function of these coregulatory proteins, relatively little is known regarding their physiological role in vivo, particularly in the brain. Our laboratory and others have demonstrated the importance of SRC-1 in the differentia- tion and activation of steroid-dependent sexual behaviors and the related neural genes. For example, we report that the inhibition of SRC-1 expression blocks the activating effects of exogenous testosterone on male sexual behaviors and increases the volume of the median preoptic area. Other coactivators are likely to be involved in the modulation in vivo of steroid receptor activity and it seems that the presence of a precise subset of coactivators could help define the phenotype of the cell by modulating a specific downstream pathway after steroid receptor activation. The very large number of coactivators and their association into preformed complexes potentially allows the determination of hundreds of different phenotypes. The study of the expression of the coactivator and their function in vivo is required to fully understand steroid action and specificity in the brain. [less ▲]

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See detailImportance of steroid receptor coregulators for neuronal phenotype determination: Modulation of steroid action
Charlier, Thierry ULg

in Trabajos del Instituto Cajal (2009), LXXXII

Steroid receptors such as estrogen receptors alpha and beta and androgen receptors are transcription factors involved in the transcriptional regulation of a large number of target genes. Steroid-dependent ... [more ▼]

Steroid receptors such as estrogen receptors alpha and beta and androgen receptors are transcription factors involved in the transcriptional regulation of a large number of target genes. Steroid-dependent expression in the brain controls a large array of biological processes including spatial cognition, copulatory behavior and neuroprotection. The discovery of a competition, or squelching, between two different nuclear receptors introduced the notion that common cofactors might be involved in the modulation of transcriptional activity of nuclear receptors. These cofactors, which are now known as coactivators, are involved in chromatin remodeling and stabilization of the general transcription machinery. Since the characterization of the steroid receptor coactivator 1 or SRC-1, more than 100 different cofactors have been identified. Although an increasingly large amount of information has been collected about the in vitro function of these coregulatory proteins, relatively little is known regarding their physiological role in vivo, particularly in the brain. Our laboratory and others have demonstrated the importance of SRC-1 in the differentiation and activation of steroid-dependent sexual behaviors and the related neural genes. In Japanese quail, the inhibition of SRC-1 expression by intracerebroventricular antisense injections blocked the activating effects of exogenous testosterone on male sexual behaviors and the steroid-dependent vasotocine expression and increase of the median preoptic area volume defined by Nissl staining as well as by aromatase immunoreactivity. These data therefore strongly suggested that SRC-1 is required to modulate estrogen receptor dependent gene-expression. It is however interesting to note that steroid receptors and SRC-1 are not always colocalized. For example, both glial cells and neurons in the hippocampus express estrogen receptor alpha but SRC-1 is rarely observed in glia. It is therefore possible that estrogen receptor alpha in glial cell require another coactivator or set of coactivators to induce estrogen-dependent gene transcription. It has been suggested very recently that SRC-1 is associated with neuronal differentiation of neural stem cell derived from the ganglionic eminence of mouse embryos. These stem cells differentiating into glial cell (GFAP-positive) did not express SRC-1. The presence of a specific coactivator could therefore determine a specific cell phenotype (neuronal vs glial). Another coactivator, the coactivator-associated arginine methyl transferase 1 or CARM-1 seems to be important to keep progenitor cells in a dividing state. The inhibition of CARM-1 expression leads to neuronal differentiation. Neurogenesis can therefore offers an excellent model to define the spatio-temporal role of different coactivators. It is indeed possible to study a subset of coactivators associated to various stages phenotype determination (proliferation vs. differentiation). The study of neurogenesis in the dentate gyrus of the hippocampus in female adult rats shows that around 40 % of proliferative cells express SRC-1 or CARM-1. Interestingly, 70% of proliferative cells express SRC-1 but only a very few cells (<5%) express CARM-1. We are currently investigating the temporal pattern of expression of these two coactivators during the neurogenesis in the hilus and dentate gyrus. The expression of the coactivators CARM-1 and SRC-1 is analyzed in proliferating and differentiating cells. We expect that proliferating and differentiating cells will differentially express the two coactivators. It seems that the presence of a precise subset of coactivators could help defining the phenotype of the cell by modulating a specific downstream pathway after steroid receptor activation. The very large number of coactivators and their association into preformed complexes potentially allows the determination of hundreds of different phenotypes. The study of the expression of the coactivator and their function in vivo is required to fully understand steroid action and specificity in the brain. [less ▲]

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See detailImportance of structural damping in the dynamic analysis of compliant deployable structures
Dewalque, Florence ULg; Rochus, Pierre ULg; Bruls, Olivier ULg

in Proceedings of the 65th International Astronautical Congress (IAC) (2014)

Compliant mechanisms such as tape springs are often used on satellites to deploy appendices, e.g. solar panels, antennas, telescopes and solar sails. Their main advantage comes from the fact that their ... [more ▼]

Compliant mechanisms such as tape springs are often used on satellites to deploy appendices, e.g. solar panels, antennas, telescopes and solar sails. Their main advantage comes from the fact that their motion results from the elastic deformation of structural components, unlike usual hinges or prismatic joints, the motion of which is dictated by contact surfaces. No actuators or external energy sources are required and the deployment is purely passive, which appears as a decisive feature for the design of low-cost missions with small satellites or cubesats. The mechanical behaviour of a tape spring is intrinsically complex and nonlinear involving buckling, hysteresis and self-locking phenomena. High-fidelity mechanical models are then needed to get a detailed understanding of the deployment process, improve the design and predict the actual behaviour in the space 0-g environment. In the majority of the previous works, dynamic simulations were performed without any physical representation of the structural damping. These simulations could be successfully achieved because of the presence of numerical damping in the transient solver. However, in this case, the dynamic response turns out to be quite sensitive to the amount of numerical dissipation, so that the predictive capabilities of the model are questionable. In this work based on numerical case studies, we show that the dynamic simulation of a tape spring can be made less sensitive to numerical parameters when the structural dissipation is taken into account. [less ▲]

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See detailImportance of surfactin for plant resistance induction by Bacillus isolates
Cawoy, Hélène ULg; Mariutto, Martin; Jourdan, Emmanuel et al

Conference (2012, June 27)

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See detailImportance of synovitis in osteoarthritis: Evidence for the use of glycosaminoglycans against synovial inflammation.
Henrotin, Yves ULg; Lambert, Cécile ULg; Richette, Pascal

in Seminars in Arthritis & Rheumatism (2014), 43(5), 579-87

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See detailImportance of the alternative pathway of respiration for avoidance of ROS production and for optimisation of photosynthesis in Chlamydomonas
Franck, Fabrice ULg; Dinant, M.; Cardol, Pierre ULg et al

Conference (2008, June)

The physiological function of the alternative pathway of respiration has been investigated by analysing two RNAi C.reinhardtii lines deprived of alternative oxidase protein (AOX1). Compared to wild-type ... [more ▼]

The physiological function of the alternative pathway of respiration has been investigated by analysing two RNAi C.reinhardtii lines deprived of alternative oxidase protein (AOX1). Compared to wild-type, AOX1- lines exhibited modified growth curves and reduced maximal cell density. These differences were more pronounced at high irradiance and in nitrate-containing medium (TAP NO3) rather than in ammonium-containing medium (TAP NH4). Although the alternative pathway was inactive, respiration was not significantly altered in transgenics. Light-saturation curves of O2-evolution were only slightly modified. However, non-photochemical quenching of fluorescence (NPQ) was strongly reduced. Further analysis showed that AOX1- transgenics present a reduced ability to promote the change in energy distribution between photosystems, known as state transition. This effect, which explains low NPQ in the light, was most pronounced in high-light cells cultivated in TAP NO3 medium. Moreover, AOX1- transgenics exhibited higher levels of intracellular peroxides, which suggests that inhibition of state transition might result from higher ROS production. In support of this hypothesis, addition of millimolar-range concentrations of H2O2 to wild-type inhibited the state transition promoted by the reduction of the plastoquinone pool in darkness. [less ▲]

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See detailImportance of the apoprotein in the catalysis of hydroperoxide lyase
Delcarte, J.; Jacques, Philippe ULg; Fauconnier, Marie-Laure ULg et al

Poster (1999, July 15)

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See detailImportance of the conserved residues in the peptidoglycan glycosyltransferase module of the class A penicillin-binding protein 1b of Escherichia coli.
Terrak, Mohammed ULg; Sauvage, Eric ULg; Derouaux, Adeline ULg et al

in Journal of Biological Chemistry (2008), 283(42), 28464-70

The peptidoglycan glycosyltransferase (GT) module of class A penicillin-binding proteins (PBPs) and monofunctional GTs catalyze glycan chain elongation of the bacterial cell wall. These enzymes belong to ... [more ▼]

The peptidoglycan glycosyltransferase (GT) module of class A penicillin-binding proteins (PBPs) and monofunctional GTs catalyze glycan chain elongation of the bacterial cell wall. These enzymes belong to the GT51 family, are characterized by five conserved motifs, and have some fold similarity with the phage lambda lysozyme. In this work, we have systematically modified all the conserved amino acid residues of the GT module of Escherichia coli class A PBP1b by site-directed mutagenesis and determined their importance for the in vivo and in vitro activity and the thermostability of the protein. To get an insight into the GT active site of this paradigm enzyme, a model of PBP1b GT domain was constructed based on the available crystal structures (PDB codes 2OLV and 2OLU). The data show that in addition to the essential glutamate residues Glu233 of motif 1 and Glu290 of motif 3, the residues Phe237 and His240 of motif 1 and Gly264, Thr267, Gln271, and Lys274 of motif 2, all located in the catalytic cavity of the GT domain, are essential for the in vitro enzymatic activity of the PBP1b and for its in vivo functioning. Thus, the first three conserved motifs contain most of the residues that are required for the GT activity of the PBP1b. The residues Asp234, Phe237, His240, Thr267, and Gln271 are proposed to maintain the structure of the active site and the positioning of the catalytic Glu233. [less ▲]

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See detailImportance of the creatinine calibration in the estimation of GFR by MDRD equation
Delanaye, Pierre ULg; Cavalier, Etienne ULg; Chapelle, Jean-Paul ULg et al

in Nephrology Dialysis Transplantation (2006), 21(4), 1130-1130

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See detailImportance of the E-46-D-160 Polypeptide Segment of the Non-Penicillin-Binding Module for the Folding of the Low-Affinity, Multimodular Class B Penicillin-Binding Protein 5 of Enterococcus Hirae
Mollerach, Marta E.; Partoune, Pierre; Coyette, Jacques ULg et al

in Journal of Bacteriology (1996), 178(6), 1774-1775

Compared with the other class B multimodular penicillin- binding proteins (PBPs), the low-affinity PBP5 responsible for penicillin resistance in Enterococcus hirae R40, has an extended non-penicillin ... [more ▼]

Compared with the other class B multimodular penicillin- binding proteins (PBPs), the low-affinity PBP5 responsible for penicillin resistance in Enterococcus hirae R40, has an extended non-penicillin-binding module because of the presence of an approximately 110-amino-acid E-46(-)D-160 insert downstream from the membrane anchor. Expression of pbp5 genes lacking various parts of the insert-encoding region gives rise to proteins that are inert in terms of penicillin binding, showing that during folding of the PBP, the insert plays a role in the acquisition of a correct penicillin-binding configuration by the G-364(-)Q-678 carboxy-terminal module. [less ▲]

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See detailThe importance of the effects of mora debitoris
Cavalleri, Vanessa ULg

Conference (2014, June 19)

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See detailImportance of the enveloppe glycoprotein gp51 in the diagnosis of BLV infection and in the development of an anti-BLV subunit vaccine.
Portetelle, Daniel ULg; Dandoy, Corinne; Gras, Hélène et al

in Journal of Cellular Biochemistry. Supplement (1986), (suppl 10 A), 209

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