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See detailCalcium daily food intake is very low in European postmenopausal women
Bruyère, Olivier ULg; De Cock, Caroline; Neuprez, Audrey ULg et al

in Osteoporosis International (2007, March), 18(Suppl.1), 125

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See detailLe calcium et la vitamine D dans la prise en charge de l'ostéoporose
Rizzoli, R.; Boonen, S.; Brandi, M. L. et al

in Journal de Gynécologie, Obstétrique et Biologie de la Reproduction (2007), 36(6), 615-617

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See detailCalcium et squelette, base physiologique d’une prévention
Reginster, Jean-Yves ULg

in Les Nouvelles de Rhumatologie (1996), 1

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See detailCalcium et squelette: base physiologique d'une prévention
Reginster, Jean-Yves ULg

in Revue Médicale de Liège (1995), 50(6), 244-8

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See detailCALCIUM HYDROXIDE LOADED PLGA MICROSPHERES FOR ENDODONTICS: EFFECT OF FORMULATION METHOD ON Ca++ RELEASE PROFILE
Chavarria Bolanos, Daniel ULg; Cerda-Cristerna, BI; Flores-Reyes, Hector et al

Poster (2012, April 04)

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See detailCalcium isotope fractionations from roots to shoots
Schmitt, A.-D.; Stille, P.; Labolle, F. et al

Conference (2013)

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See detailCalcium phosphate scaffolds customizations for bone tissue engineering applications
Carlier, Aurélie ULg; Chai, Yoke Chin; Theys, Tina et al

Poster (2011, November 18)

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See detailCalcium Release from Internal Stores Is Required for the Generation of Spontaneous Hyperpolarizations in Dopaminergic Neurons of Neonatal Rats
Seutin, Vincent ULg; Mkahli, F.; Massotte, Laurent ULg et al

in Journal of Neurophysiology (2000), 83(1), 192-7

We recently have demonstrated the existence of spontaneous hyperpolarizations in midbrain dopaminergic neurons of neonatal but not adult rats. These events are mediated by the opening of apamin-sensitive ... [more ▼]

We recently have demonstrated the existence of spontaneous hyperpolarizations in midbrain dopaminergic neurons of neonatal but not adult rats. These events are mediated by the opening of apamin-sensitive K(+) channels after a rise in the intracellular concentration of Ca(2+). They are resistant to tetrodotoxin in most cases and are probably endogenous (i.e., not synaptically activated). Here their mechanism was investigated. Cyclopiazonic acid (10 microM), a specific inhibitor of endoplasmic reticulum Ca(2+) ATPases, reversibly abolished the events. Caffeine, which promotes Ca(2+) release from intracellular stores, had concentration-dependent effects. At 1 mM, it markedly and steadily increased the frequency and the amplitude of the hyperpolarizations. At 10 mM, it induced a transient increase in their frequency followed by their cessation. All these effects were quickly reversible. Ryanodine (10 microM), which decreases the conductance of Ca(2+) release channels, irreversibly blocked the spontaneous hyperpolarizations. Dantrolene (100 microM), a blocker of Ca(2+) release from sarcoplasmic reticulum of striated muscle, did not affect the events. On the other hand, Cd(2+) (100-300 microM), a broad antagonist of membrane voltage-gated Ca(2+) channels, significantly reduced the amplitude and the frequency of the hyperpolarizations. However, when the frequency of the events was increased by 1 mM caffeine, Cd(2+) affected them to a smaller extent, whereas cyclopiazonic acid still abolished them. We conclude that internal stores are the major source of Ca(2+) ions that induce the K(+) channel openings underlying the spontaneous hyperpolarizations of these neurons. [less ▲]

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See detailCalcium, phosphorus and magnesium in Paediatric Parenteral Nutrition
Fewtrell, mary; Goulet, Olivier; Mihatsch, Walter et al

in Clinical Nutrition (in press)

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See detailCalcium, phosphorus, magnesium and vitamin D requirements of preterm infants
SENTERRE, Thibault ULg

Scientific conference (2015)

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See detailCalcium, phosphorus, magnesium and vitamin D requirements of the preterm infants
Mimouni, F; Mandel, D; Lubetzky, R et al

in World Review of Nutrition and Dietetics (2014), 110

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See detailCalcium-controlled peroxidase secretion by sugarbeet cell suspensions in relation to habituation
Kevers, Claire ULg; Sticher, L.; Penel, C. et al

in Plant Growth Regulation (1982), 1(1), 61-66

Sugarbeet cells from normal and habituated callus released peroxidases in liquid cultures, in proportion to their endogenous level. Calcium promoted this release more in the normal than in the habituated ... [more ▼]

Sugarbeet cells from normal and habituated callus released peroxidases in liquid cultures, in proportion to their endogenous level. Calcium promoted this release more in the normal than in the habituated line. Treatment of the cells with sodium azide, sodium hydrogenarsenate or phenothiazine inhibited the calcium effect, which indicated a dependence on metabolic energy and on calmodulin regulation. The Ca ionophore Ro (bromolasalocid ethanolate) restricted peroxidase release. © 1982 Martinus Nijhoff/Dr W. Junk Publishers. [less ▲]

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See detailCalcium-dependent phosphorylation processes control brain aromatase in quail
Balthazart, Jacques ULg; Baillien, Michelle; Charlier, Thierry ULg et al

in European Journal of Neuroscience (2003), 17(8), 1591-1606

Increased gene transcription activated by the binding of sex steroids to their cognate receptors is one important way in which oestrogen synthase (aromatase) activity is regulated in the brain. This ... [more ▼]

Increased gene transcription activated by the binding of sex steroids to their cognate receptors is one important way in which oestrogen synthase (aromatase) activity is regulated in the brain. This control mechanism is relatively slow (hours to days) but recent data indicate that aromatase activity in quail preoptic-hypothalamic homogenates is also rapidly (within minutes) affected by exposure to conditions that enhance Ca2+-dependent protein phosphorylation. We demonstrate here that Ca2+-dependent phosphorylations controlled by the activity of multiple protein kinases including PKC, and possibly also PKA and CAMK, can rapidly down-regulate aromatase activity in brain homogenates. These phosphorylations directly affect the aromatase molecule itself. Western blotting experiments on aromatase purified by immunoprecipitation reveal the presence on the enzyme of phosphorylated serine, threonine and tyrosine residues in concentrations that are increased by phosphorylating conditions. Cloning and sequencing of the quail aromatase identified a 1541-bp open reading frame that encodes a predicted 490-amino-acid protein containing all the functional domains that have been previously described in the mammalian and avian aromatase. Fifteen predicted consensus phosphorylation sites were identified in this sequence, but only two of these (threonine 455 and 486) match the consensus sequences corresponding to the protein kinases that were shown to affect aromatase activity during the pharmacological experiments (i.e. PKC and PKA). This suggests that the phosphorylation of one or both of these residues represents the mechanism underlying, at least in part, the rapid changes in aromatase activity. [less ▲]

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See detailCalcium-dependent potassium channels.
Drion, Guillaume ULg; Philippart, Fabian ULg; Sepulchre, Rodolphe ULg et al

in Jaeger, Dieter; Jung, Ranu (Eds.) Encyclopedia of Computational Neuroscience (2015)

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See detailCalcium-induced conformational changes of the elicitor and membrane-active fengycin
Nasir, Mehmet Nail ULg; Lins, Laurence ULg; Ongena, Marc ULg et al

Poster (2012, April)

Fengycin is a natural lipopeptide synthetized by Bacillus subtilis strains. It is characterized by strong antifungal and low hemolytic activities. It seems also play a role in the promoting of elicitor ... [more ▼]

Fengycin is a natural lipopeptide synthetized by Bacillus subtilis strains. It is characterized by strong antifungal and low hemolytic activities. It seems also play a role in the promoting of elicitor activities of other compounds. The target of the biological activities of fengycin is supposed to be plasma membrane of sensitive cells. Even though the natural fengycin from has been discovered 25 years ago, nowadays, there is an increase of interest for this compound because of its potent applications. Until 15 years ago, the primary structure of fengycin was a matter of open debate before the publication of the corrected structure obtained by nuclear magnetic resonance and mass spectroscopy techniques. Although the infrared and ultraviolet absorption spectra of the lipopeptide were measured, no detailed analysis of these data was performed probably because of the unconventional sequence of the lipopeptide making these kinds of analyses complicated. In this work, our attempt was to analyze the conformational properties of fengycin as well as the calcium-induced changes using two complementary spectroscopic methods, Fourrier transformed infrared spectroscopy (FTIR) and circular dichroism (CD). In a first step, we have characterized the conformational properties of pure fengycin. The lipopeptide adopts turn conformation in trifluoroethanol, a membrane-mimicking solvent. D-aminoacids seem to be involved in intra molecular hydrogen bonds. In a second step, we have investigated the role played by Ca2+ ions on the possible conformational changes of fengycin. The addition of calcium gives rise to important modifications of the conformation. As fengycin has two glutamate residues, calcium is supposed to bind to their side chains. In conclusion, we have demonstrated that the conformation of fengycin is closely depending of the environment and the presence of calcium ions play an important role on the conformational changes of the lipopeptide. Moreover, spectra obtained both FTIR and CD methods ascertain the presence of turn conformation. [less ▲]

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See detailCalcium-Iron Oxide as Energy Storage Medium in Rechargeable Oxide Batteries
Berger, Cornelius M.; Mahmoud, Abdelfattah ULg; Hermann, Raphaël ULg et al

in Journal of the American Ceramic Society (2016)

Rechargeable oxide batteries (ROB) comprise a regenerative solid oxide cell (rSOC) and a storage medium for oxygen ions. A sealed ROB avoids pumping loss, heat loss, and gas purity expenses in comparison ... [more ▼]

Rechargeable oxide batteries (ROB) comprise a regenerative solid oxide cell (rSOC) and a storage medium for oxygen ions. A sealed ROB avoids pumping loss, heat loss, and gas purity expenses in comparison with conventional rSOC. However, the iron oxide base storage medium degrades during charging– discharging cycles. In comparison, CaFe3O5 has improved cyclability and a high reversible oxygen storage capacity of 22.3 mol%. In this study, we analyzed the redox mechanism of this compound. After a solid-state synthesis of CaFe3O5, we verified the phase composition and studied the redox reaction by means of X-ray diffraction, Mossbauer spectrometry, and scanning electron microscopy. Results show a great potential to operate the battery with this storage material during multiple charging–discharging cycles. [less ▲]

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See detailCalcium-vitamin D supplementation in clinical trials of osteoporosis should be titrated on the basis of pre-study assessments
Reginster, Jean-Yves ULg; Diez-Perez, A.; Ortolani, S. et al

in Osteoporosis International (2002), 13(S1), 24

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See detailCalcul d'ossatures et Assembleges : Considération Economiques
Anderson, D.; Colson, A.; Jaspart, Jean-Pierre ULg

in Constructions Métalliques (1994), (1),

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See detailCalcul d'un assemblage par platine comportant quatre boulons par rangée
Couchaux, Maël; Demonceau, Jean-François ULg; Weynand, Klaus

in Construction Métallique (2015), 2

Les assemblages de continuité par platine d’extrémité comportent très souvent 2 boulons par rangée. Cependant, lorsque la hauteur de l’assemblage devient importante (supérieure à 600 mm) ou lorsqu’il ... [more ▼]

Les assemblages de continuité par platine d’extrémité comportent très souvent 2 boulons par rangée. Cependant, lorsque la hauteur de l’assemblage devient importante (supérieure à 600 mm) ou lorsqu’il n’est pas possible d’utiliser une rangée extérieure, 4 boulons peuvent être mis en place au niveau des rangées se situant directement sous la semelle (voir Figure 1). Cette disposition constructive peut permettre d’augmenter significativement la résistance de la rangée intérieure tendue si l’épaisseur de la platine est suffisante ainsi que la résistance à l’effort tranchant de l’assemblage. La NF P 22-460 [4] donnait une méthode de calcul de la résistance d’une rangée tendue comportant 4 boulons dans le paragraphe 9.3. La partie 1-8 de l’Eurocode 3 [1] permet quant à elle de prédire la résistance d’un assemblage via la méthode des composantes et, en particulier, de déterminer la résistance en traction de rangées de boulons à partir de la méthode des tronçons en T décrite dans le paragraphe 6.2.4. Cependant, cette méthode des tronçons en T ne couvre que les rangées comportant 2 boulons ; aucune information n’est donc fournie pour les rangées présentant 4 boulons. Néanmoins la méthode des composantes telle que recommandée dans l’Eurocode 3 est une méthodologie générale qui peut être adaptée à des assemblages comportant 4 boulons par rangée horizontale moyennant une validation expérimentale. Une telle adaptation est proposée par Demonceau et al [7] afin de déterminer la résistance en traction de rangées comportant 4 boulons. Cette méthode, développée dans le cadre d’un projet national Allemand (Projektbesprechung AIF-Forschungsvorhaben 15059N) est fondée sur la méthode des tronçons en T susmentionnée et est donc similaire à celle proposée pour le calcul de la résistance en traction de rangées comportant 2 boulons. Cette méthode a également été validée par comparaison à des résultats d’essais et implémentée dans le logiciel CoP [8]. Cette méthode a d’ailleurs été introduite dans les recommandations de la CNC2M pour le dimensionnement des assemblages selon l’EN 1993-1-8 [5]. L’objet de cette note technique est de présenter une méthode de calcul basée sur les références [6], [7] et [9] permettant d’évaluer la résistance et la rigidité d’assemblages par platine comportant 4 boulons par rangée. Les spécificités de l’Annexe Nationale française concernant les diagrammes triangulaires sont par ailleurs rappelées. Cette présentation de la méthode de calcul est suivie d’un exemple d’application. L’origine de ces nouvelles formulations est par ailleurs expliquée en annexe A.1. Enfin, la comparaison entre les résultats d’essais et ceux obtenus à partir de cette méthode est présentée en annexe A.2. [less ▲]

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