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See detailLes quartiers durables : processus de production et reproductibilité
Marique, Anne-Françoise ULg

Master's dissertation (2009)

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See detailAnalyse expérimentale du fonctionnement hydraulique des déversoirs en touches de piano
Machiels, Olivier ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Actes du Colloque Dimensionnement et Fonctionnement des Evacuateurs de crues (2009)

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See detailEffects of aggressive encounters on plasma corticosteroid-binding globulin and its ligands in white-crowned sparrows.
Charlier, Thierry ULg; Underhill, Caroline; Hammond, Geoffrey L. et al

in Hormones & Behavior (2009), 56(3), 339-47

In birds, corticosteroid-binding globulin (CBG) binds corticosterone, progesterone and testosterone. The concentration of each ligand can alter the binding of the other ligands through competitive ... [more ▼]

In birds, corticosteroid-binding globulin (CBG) binds corticosterone, progesterone and testosterone. The concentration of each ligand can alter the binding of the other ligands through competitive interactions. Thus, an increase in corticosterone or progesterone may displace testosterone bound to CBG, leading to an increase in bioactive free testosterone levels without affecting total testosterone levels in the circulation. Aggressive interactions increase plasma total testosterone levels in some birds but not in others. Here, we tested the hypothesis that aggressive encounters in the late breeding season would not increase total testosterone levels in plasma, but would alter CBG, total corticosterone or total progesterone levels in such a way as to modify the number of available binding sites and therefore occupancy by testosterone. A marked decrease in CBG occupancy by testosterone would indirectly suggest an increase in free testosterone levels in plasma. Wild male white-crowned sparrows were exposed to a simulated territorial intrusion (STI) or control for 30 min. Subjects were then caught and bled. We measured CBG using a ligand-binding assay and corticosterone, progesterone and testosterone using highly sensitive radioimmunoassays. STI significantly increased aggressive behaviors but did not affect plasma total testosterone levels. STI significantly increased plasma CBG and total corticosterone levels and decreased plasma total progesterone levels. We predict that CBG occupancy by corticosterone will increase slightly following an aggressive encounter. However, this small change is unlikely to increase free testosterone levels, because of the large number of seemingly unoccupied CBG binding sites in these subjects. [less ▲]

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See detailDevelopment of a practical test of insulin resistance in obese Beagle dogs and effects of sc FOS
Daumas, Caroline; Lhoest, Estelle; Hornick, Jean-Luc ULg et al

in Mussa, P. P.; Nery, J.; Schiavone, A. (Eds.) et al Congress Proceedings 13t h Congress of the ESVCN (2009)

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See detailStrontium ranelate: new data on fracture prevention and mechanisms of action.
Reginster, Jean-Yves ULg; Deroisy, Rita ULg; Neuprez, Audrey et al

in Current Osteoporosis Reports (2009), 7(3), 96-102

Osteoporosis treatments need to combine an unequivocally demonstrated reduction of fractures, at various skeletal sites, long-term safety, and a user-friendly profile that optimizes therapeutic adherence ... [more ▼]

Osteoporosis treatments need to combine an unequivocally demonstrated reduction of fractures, at various skeletal sites, long-term safety, and a user-friendly profile that optimizes therapeutic adherence. Strontium ranelate is the first compound to simultaneously decrease bone resorption and stimulate bone formation. Its anti-fracture efficacy at various skeletal sites has been established for as long as 5 years through studies of the highest methodological standards. Increases in bone mineral density observed after 1 year of treatment are predictive of the long-term fracture efficacy, suggesting for the first time in osteoporosis that bone densitometry can be used as a monitoring tool. Due to a positive risk/benefit ratio, strontium ranelate is now considered as a first-line treatment in the management of osteoporosis. [less ▲]

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See detailThe fully-active and structurally-stable form of the mitochondrial ATP synthase of Polytomella sp is dimeric
Villavicencio-Queijeiro, Alexa; Vazquez-Acevedo, Miriam; Cano-Estrada, Araceli et al

in Journal of Bioenergetics & Biomembranes (2009), 41(1), 1-13

Mitochondrial F1FO-ATP synthase of chlorophycean algae is a stable dimeric complex of 1,600 kDa. It lacks the classic subunits that constitute the peripheral stator-stalk and the orthodox polypeptides ... [more ▼]

Mitochondrial F1FO-ATP synthase of chlorophycean algae is a stable dimeric complex of 1,600 kDa. It lacks the classic subunits that constitute the peripheral stator-stalk and the orthodox polypeptides involved in the dimerization of the complex. Instead, it contains nine polypeptides of unknown evolutionary origin named ASA1 to ASA9. The isolated enzyme exhibited a very low ATPase activity (0.03 Units/mg), that increased upon heat treatment, due to the release of the F-1 sector. Oligomycin was found to stabilize the dimeric structure of the enzyme, providing partial resistance to heat dissociation. Incubation in the presence of low concentrations of several non-ionic detergents increased the oligomycin-sensitive ATPase activity up to 7.0-9.0 Units/mg. Incubation with 3% (w/v) taurodeoxycholate monomerized the enzyme. The monomeric form of the enzyme exhibited diminished activity in the presence of detergents and diminished oligomycin sensitivity. Cross-linking experiments carried out with the dimeric and monomeric forms of the ATP synthase suggested the participation of the ASA6 subunit in the dimerization of the enzyme. The dimeric enzyme was more resistant to heat treatment, high hydrostatic pressures, and protease digestion than the monomeric enzyme, which was readily disrupted by these treatments. We conclude that the fully-active algal mitochondrial ATP synthase is a stable catalytically active dimer; the monomeric form is less active and less stable. Monomer-monomer interactions could be mediated by the membrane-bound subunits ASA6 and ASA9, and may be further stabilized by other polypeptides such as ASA1 and ASA5. [less ▲]

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See detailNéphrologie pédiatrique à l'usage du 3°cycle médecine
Battisti, Oreste ULg

Learning material (2009)

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See detailLes planètes
Nazé, Yaël ULg

Article for general public (2009)

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See detailSurface modification of copper with 2-dodecylpropane-1,3-dithiol: The key effect of the solvent
Denayer, Jessica ULg; Delhalle, J.; Mekhalif, Z.

in Applied Surface Science (2009), 256(5), 1426-1430

Self-assembly of alkanethiol on gold in various solvents (alkane, alcohol, etc) leads to monolayers with similar properties. However when the self-assembly is performed on copper substrates, the nature of ... [more ▼]

Self-assembly of alkanethiol on gold in various solvents (alkane, alcohol, etc) leads to monolayers with similar properties. However when the self-assembly is performed on copper substrates, the nature of the solvent has an effect on the properties of the monolayer. This phenomenon arises from the chemical interaction of copper with the solvent, which is not the case of gold. Ethanol is a solvent widely used for self-assembly, however some studies pointed out its negative effect due to its significant chemical reactivity towards copper and its ability to chemisorb on the surface. The aim of this work consists in a comparative investigation of 2-dodecylpropane-1,3-dithiol (or R(SH)2) in various solvents and its ability to form stable SAMs, densely packed and well ordered. Characterizations of the SAMs are carried out using X-ray photoelectron spectroscopy (XPS), polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS) and cyclic voltammetry (CV). © 2009 Elsevier B.V. All rights reserved. [less ▲]

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See detailCumulate origin and polybaric crystallization of Fe-Ti oxide ores in the Suwalki anorthosite, northeastern Poland
Charlier, Bernard ULg; Namur, Olivier ULg; Duchesne, Jean Clair et al

in Economic Geology (2009), 104

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See detailAgonistic sounds in the clownfish Amphiprion clarkii: implication of the swimbladder in the sound-producing mechanism
Colleye, Orphal ULg; Nakamura, Masaru; Parmentier, Eric ULg

Poster (2009)

Clownfishes are aggressive fishes that use sound production to defend their anemone territory. It has been shown that they produce agonistic sounds using a jaw teeth snapping. At present, this mechanism ... [more ▼]

Clownfishes are aggressive fishes that use sound production to defend their anemone territory. It has been shown that they produce agonistic sounds using a jaw teeth snapping. At present, this mechanism has highlighted the onset of the sound but has not explained yet which structure is responsible for the sound modulation. Interestingly, some acoustic features such as dominant frequency and pulse duration are directly related to fish size. Such variations are linked to a morphological constraint. Also, the existent relationship between fish size and swimbladder size implies that the swimbladder might be involved in the sound production. Sound analyses in Amphiprion clarkii showed that the experimental filling of the swimbladder with physiological liquid (NaCl 9‰) significantly modified the acoustic features. The most striking changes were a significant increase in dominant frequency and a significant decrease in pulse duration. These observations highlighted the implication of the swimbladder in sound modulation. In clownfishes, dominant frequency and pulse duration are morphologically determined signals. The swimbladder appears to modulate these acoustic features by acting as a resonant chamber. [less ▲]

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See detailLa neuropathie autonome: une complication méconnue du diabète
Philips, Jean-Christophe ULg; Marchand, Monique; Scheen, André ULg

in Association belge du diabète (2009), 52(1), 24-29

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See detailStructural and magnetic properties of Pr18Li8Fe5-xMxO39 (M = Ru, Mn, Co)
Dutton, Sian E; Battle, Peter D; Grandjean, Fernande ULg et al

in Journal of Solid State Chemistry (2009), 182(7), 1638-1648

A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mossbauer spectroscopy; samples of Pr18Li8Fe5 ... [more ▼]

A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mossbauer spectroscopy; samples of Pr18Li8Fe5-xMxO39 and Pr18Li8Fe5-xCoxO39 (x = 1, 2) have been studied by magnetometry. All these Compounds adopt a cubic structure (space group Pm (3) over barn, a(o)similar to 11.97 angstrom) based on intersecting < 111 > chains made up of alternating octahedral and trigonal-prismatic coordination sites. These chains occupy channels within a Pr-O framework. The trigonal-prismatic site in Pr18Li8Fe4RuO39 is occupied by Li+ and high-spin Fe3+. The remaining transition-metal cations occupy the two crystallographically-distinct octahedral sites in a disordered manner. All five compositions adopt a spin-glass-like state at 7 K (Pr18Li8Fe4RuO39) or below. (C) 2009 Elsevier Inc. All rights reserved. [less ▲]

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See detailThermally-responsive nanogels by RAFT-mediated aqueous dispersion polymerization
Rieger, Jutta ULg; Grazon, Chloé; Bui, Chuong et al

in PMSE preprints (2009), 101

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See detailLes défauts d'implantation placentaire et leurs conséquences sur la fonction endothéliale maternelle
Foidart, Jean-Michel ULg; Noël, Agnès ULg; Chantraine, Frédéric ULg et al

in Bulletin Académique National de Médecine (2009), 193(5), 1059-66

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See detailPolitiques de la souffrance, politiques du vivant : quand les corps « parlent » de la souffrance
Vrancken, Didier ULg

in Perilleux, Thomas; Cultiaux, John (Eds.) Destins politiques de la souffrance. Intervention sociale, justice, travail (2009)

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See detailStatic and Dynamic experimental investigations of a micro-electromechanical cantilever in air and vacuum
Gutschmidt, Stefanie; Rochus, Véronique ULg; Golinval, Jean-Claude ULg

(2009)

The dynamic response of electro-mechanically actuated micro structures is governed by nonlinear effects which directly influence their performance. To date, most work in the field of micro/nano systems is ... [more ▼]

The dynamic response of electro-mechanically actuated micro structures is governed by nonlinear effects which directly influence their performance. To date, most work in the field of micro/nano systems is done experimentally and documented theoretical research consists of nonlinear lumped-mass models as well as continuum mechanics approaches. Existing and codified computational tools for micro-electromechanical systems (MEMS) more and more penetrate the market of designers and fabrication of such devices. The present work is the experimental part of a bench-mark study of a selected microbeam structure investigated with aforementioned analytical and computational techniques and compared to experiments performed with a Polytec MSA400 analyzer. The emphasis of this benchmark study is put on the nonlinear dynamic behavior with respect to qualitative and quantitative explanations of the electro-mechanical actuation and damping mechanisms. [less ▲]

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