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See detailThe Pseudomonas aeruginosa pirA gene encodes a second receptor for ferrienterobactin and synthetic catecholate analogues.
Ghysels, Bart ULg; Ochsner, Urs; Mollman, Ute et al

in FEMS microbiology letters (2005), 246(2), 167-74

Actively secreted iron chelating agents termed siderophores play an important role in the virulence and rhizosphere competence of fluorescent pseudomonads, including Pseudomonas aeruginosa which secretes ... [more ▼]

Actively secreted iron chelating agents termed siderophores play an important role in the virulence and rhizosphere competence of fluorescent pseudomonads, including Pseudomonas aeruginosa which secretes a high affinity siderophore, pyoverdine, and the low affinity siderophore, pyochelin. Uptake of the iron-siderophore complexes is an active process that requires specific outer membrane located receptors, which are dependent of the inner membrane-associated protein TonB and two other inner membrane proteins, ExbB and ExbC. P. aeruginosa is also capable of using a remarkable variety of heterologous siderophores as sources of iron, apparently by expressing their cognate receptors. Illustrative of this feature are the 32 (of which 28 putative) siderophore receptor genes observed in the P. aeruginosa PAO1 genome. However, except for a few (pyoverdine, pyochelin, enterobactin), the vast majority of P. aeruginosa siderophore receptor genes still remain to be characterized. Ten synthetic iron chelators of catecholate type stimulated growth of a pyoverdine/pyochelin deficient P. aeruginosa PAO1 mutant under condition of severe iron limitation. Null mutants of the 32 putative TonB-dependent siderophore receptor encoding genes engineered in the same genetic background were screened for obvious deficiencies in uptake of the synthetic siderophores, but none showed decreased growth stimulation in the presence of the different siderophores. However, a double knock-out mutant of ferrienterobactin receptor encoding gene pfeA (PA 2688) and pirA (PA0931) failed to be stimulated by 4 of the tested synthetic catecholate siderophores whose chemical structures resemble enterobactin. Ferric-enterobactin also failed to stimulate growth of the double pfeA-pirA mutant although, like its synthetic analogues, it stimulated growth of the corresponding single mutants. Hence, we confirmed that pirA represents a second P. aeruginosa ferric-enterobactin receptor. The example of these two enterobactin receptors probably illustrates a more general phenomenon of siderophore receptor redundancy in P. aeruginosa. [less ▲]

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See detailAdherence to first-line antiretroviral regimens in Rwanda.
Demeester, Remy; Omes, Christine; Karasi, Jean Claude ULg et al

in Journal of Acquired Immune Deficiency Syndromes [=JAIDS] (2005), 40(1), 113-4

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See detailFish introduction is a major cause of paedomorphosis extinction in European newts (Triturus spp.)
Džukić, Georg; Ćirović, Ruža; Denoël, Mathieu ULg et al

in Froglog (2005), 69

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See detailMise en évidence de la faille de Marenne sur la carte géologique Aye - Marche-en-Famenne
Barchy, Laurent; Coen-Aubert, Marie; Marion, Jean-Marc ULg et al

Poster (2005)

Revision of the geological map Aye-Marche (Belgium, Wallonia) has highlighted a major tectonic fault known as "Marenne fault". Its presence would explain the increased thickness of the Givetian limestones ... [more ▼]

Revision of the geological map Aye-Marche (Belgium, Wallonia) has highlighted a major tectonic fault known as "Marenne fault". Its presence would explain the increased thickness of the Givetian limestones up to the valley of Ourthe river. [less ▲]

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See detailLabor
Durand, Pascal ULg

in Fouché, P.; Péchoin, D.; Schuwer, Ph (Eds.) Dictionnaire encyclopédique du livre (2005)

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See detailKistemaeckers
Durand, Pascal ULg

in Fouché, P.; Péchoin, D.; Schuwer, Ph. (Eds.) Dictionnaire encyclopédique du livre (2005)

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See detailMarabout
Durand, Pascal ULg

in Fouché, P.; Péchoin, D.; Schuwer, Ph. (Eds.) Dictionnaire encyclopédique du livre (2005)

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See detailValorisation des petits bois rouges en Région wallonne
Hebert, Jacques ULg; Bailly, Francine; Brunin, Emmanuelle et al

in Forêt Wallonne (2005), 75(75), 19-31

La forêt wallonne offre aujourd'hui une quantité limitée mais cependant significative de bois rouges de petites dimensions. Malheureusement, ceux-ci ne trouvent généralement pas acquéreur à des prix ... [more ▼]

La forêt wallonne offre aujourd'hui une quantité limitée mais cependant significative de bois rouges de petites dimensions. Malheureusement, ceux-ci ne trouvent généralement pas acquéreur à des prix raisonnables. Cet état de fait tient à une série de griefs, justifiés ou non, attribués à ces produits et sur lesquels nous souhaitons nous arrêter ici. [less ▲]

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See detailPour une définition européenne du tourisme culturel
Teller, Jacques ULg; Dumont, E.; Origet du Cluzeau, C.

in Espaces (2005)

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See detailUn mecanisme physiopathologique central a l'origine des complications du diabete?
Defraigne, Jean-Olivier ULg

in Revue Médicale de Liège (2005), 60(5-6, May-Jun), 472-8

Diabetes mellitus is associated to micro- and macro-vascular lesions responsible for myocardial infarction, nephropathy, retinopathy and polyneuropathy. Four main pathogenic mechanisms have been proposed ... [more ▼]

Diabetes mellitus is associated to micro- and macro-vascular lesions responsible for myocardial infarction, nephropathy, retinopathy and polyneuropathy. Four main pathogenic mechanisms have been proposed, all associated with hyperglycaemia: 1) increased flux in the polyol pathway; 2) increased flux in the hexosamine pathway; 3) protein kinase C activation; and 4) increased formation of advanced glycation endproducts. A common mechanism seems to play a central role in the activation of these various pathways. Indeed, an increased production of free radicals by mitochondria induced by hyperglycaemia may be responsible for the observed metabolic disturbances. The present article describes that theory and presents its possible therapeutic implications. [less ▲]

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See detailRécits de vie. La honte comme biographème universel et singulier
Dawans, Stéphane ULg

in Guillaume, Jean-François (Ed.) Parcours de vie. Regards croisés sur la construction des biographies contemporaines (2005)

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See detailWeakly nonlinear study of Marangoni instabilities in an evaporating liquid layer
Dondlinger, Mireille; Margerit, Jonathan; Dauby, Pierre ULg

in Journal of Colloid & Interface Science (2005), 283(2), 522-532

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See detailLe financement des communes centres. Eclairages de la théorie économique et problèmes fiscaux.
Jurion, Bernard ULg

in Bulletin de Documentation, Service Public Fédéral Finances (2005)

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See detailEtude comparative de la diversité et de la structure génétique de populations sauvages de Phaseolus lunatus L. à l'aide des marqueurs enzymatiques et microsatellites
Ouedraogo, M.; Maquet, A.; Baudoin, Jean-Pierre ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2005), 9(3), 195-205

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See detailDiversity of cucurbit species cultivated in Côte d'Ivoire for Edible Seeds
Zoro Bi, I.; Koffi; Dje, Y. et al

in Cucurbit Genetics Cooperative, Report 2005 (2005), (28-29), 84-90

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See detailMating System Of Wild Phaseolus Lunatus L. And Its Relationship To Population Size
Zoro Bi, I.; Maquet, A.; Baudoin, Jean-Pierre ULg

in Heredity (2005), 94(2), 153-158

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See detailLe papier dans les environnements virtuels pour l’architecture : Quels supports pour un traitement digital de l’information?
Boulanger, Christelle; Safin, Stéphane ULg; Leclercq, Pierre ULg

in Actes de SCAN'05 : Séminaire de conception architecturale numérique (2005)

En architecture, le support papier est présent dans différentes activités et, malgré la prégnance de l’informatique dans tous les domaines, il reste l’outil privilégié de l’architecte pour réaliser ses ... [more ▼]

En architecture, le support papier est présent dans différentes activités et, malgré la prégnance de l’informatique dans tous les domaines, il reste l’outil privilégié de l’architecte pour réaliser ses relevés ou ses premières esquisses de conception. Les caractéristiques du papier-crayon, comme sa maniabilité ou sa faculté à supporter la créativité par l’ambiguïté et l’imprécision des traits, en font un outil incontournable. Dans le cadre du développement d’interfaces-esquisse basées sur une technologie à stylo et dont l’objectif principal est d’apporter des aides dans les phases de relevé et dans les premières phases de conception, nous nous intéressons à la question du support : est-il possible d’utiliser un papier satisfaisant aux caractéristiques essentielles du papier traditionnel, et qui serait un support pour un traitement digital de l’information ? Nous nous intéressons aux questions d’usage et envisageons les différents types de papiers virtuels en regard des différentes situations de travail que rencontre l’architecte. [less ▲]

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See detailDifférence et identité : les enjeux phénoménologiques du « pli »
Cormann, Grégory ULg; Laoureux, Sébastien; Pieron, Julien ULg

Book published by Olms Verlag (2005)

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See detailLogement et fiscalité immobilière. Quelles politiques possibles pour les régions?
Jurion, Bernard ULg

in Bernard, N.; Mertens, Ch. (Eds.) Le logement dans sa multidimensionnalité. Une grande cause régionale. (2005)

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See detailLEAFY expression and temporal sequence of floral transition in Sinapis alba L.
Bonhomme, Delphine ULg; Périlleux, Claire ULg

Poster (2005)

The shoot apical meristem (SAM) of Sinapis alba can be switched from vegetative to reproductive fate by exposure of 2-month old plants to a single long day (LD). Floral transition then occurs in good ... [more ▼]

The shoot apical meristem (SAM) of Sinapis alba can be switched from vegetative to reproductive fate by exposure of 2-month old plants to a single long day (LD). Floral transition then occurs in good synchrony within a population, and a number of biochemical, cellular, and morphological changes have been described. Our aim is to integrate gene expression patterns into this timing. We report here the analysis of SaLFY, orthologous to the floral meristem identity gene LEAFY of Arabidopsis. Materials and Methods: Plants of Sinapis were grown in 8-h shorts days for two months before being induced to flower by one 22-h LD. Shoot apices were harvested 24, 32, 40, 48, 56 and 80h after start of the LD, and prepared for in situ hybridization (Melzer et al., 1999). Results and Conclusions: As expected, the expression of SaLFY was very strong in flower primordia. More surprisingly, SaLFY was expressed well before the initiation of flowers. First, a strong signal was detected in the tip of young leaf primordia of vegetative plants. Secondly, SaLFY was transiently expressed in the SAM of induced plants, from 32h after the start of the LD, when cell proliferation increased. The signal formed, in transverse sections, a discontinuous ring with activation where last leaves were to be initiated. Interestingly, this activation in the SAM matched in time and space early growth changes previously described during the transition to flowering, namely an increase of leaf primordia growth and an acceleration of last leaf initiation (Bernier, 1997), suggesting that SaLFY may have dual functions in fate specification during the floral transition of the SAM. References: Bernier G 1997. J Exp Bot 48; 1071-1077. Melzer S, Kampmann G, Chandler J, Apel K 1999. Plant J 18; 395-405. [less ▲]

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