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See detailCaractérisation géographique des zones funéraires antiques et médiévales dans le bassin de la Vesdre (Belgique). Questions et méthodes
Van Ruymbeke, Muriel ULg

in Bulletin de liaison de l'association française d'archéologie mérovingienne (2005)

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See detailSuperconducting nanostructured magnesium diboride
Kalaydjiev, K.; Lovchinov, V.; Dimitrov, D. et al

in Journal of Optoelectronics and Advanced Materials [= JOAM] (2005), 7(1), 423-426

Like conventional superconductors, MgB2 is a phonon-mediated superconductor with a relatively long coherence length. Its properties make the prospects for fabricating reproducible uniform Josephson ... [more ▼]

Like conventional superconductors, MgB2 is a phonon-mediated superconductor with a relatively long coherence length. Its properties make the prospects for fabricating reproducible uniform Josephson junctions, the fundamental element of superconducting circuits, much more favorable for MgB2 than for high-temperature superconductors. Here, we report bulk superconductivity in nanophase MgB2, using a two-step technique of mechanically activated sjavascript:$('next-but').click();elf-propagated high-temperature synthesis(MASHS). The conditions of synthesis and some properties of the product (structure, susceptibility, resistivity) were studied. It was shown that a single-phase product was obtained after 2 hours of intense mechanical treatment of reagents (Mg and B powders), and MASHS induced at 30 A cm(-2). [less ▲]

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See detailPour une description typographique du poème
Purnelle, Gérald ULg

in Degrés : Revue de Synthèses à Orientation Sémiologique (2005), 121-122(printemps-été), 1-14

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See detailRégularité/opacité chez Bernard Vargaftig
Purnelle, Gérald ULg

in Formes poétiques contemporaines (2005), 3

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See detailStructuration de l’ambiguïté chez Gérard Titus-Carmel
Purnelle, Gérald ULg

in Formes Poétiques Contemporaines (2005), 3

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See detailPhotocancérogenèse cutanée.
Uhoda, Isabelle; Quatresooz, Pascale ULg; Rorive, Andrée ULg et al

in Revue Médicale de Liège (2005), 60 Suppl 1

Most of the cutaneous carcinomas and melanomas are photo-induced cancers. By contrast, some cutaneous lymphomas are inhibited by light exposure. The annual incidence of photo-induced cancers is steadily ... [more ▼]

Most of the cutaneous carcinomas and melanomas are photo-induced cancers. By contrast, some cutaneous lymphomas are inhibited by light exposure. The annual incidence of photo-induced cancers is steadily on the rise. [less ▲]

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See detailOù va la critique scientifique?
Defays, Jean-Marc ULg

in Parole (2005), 33

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See detailThe homeobox protein MSX2 interacts with tax oncoproteins and represses their transactivation activity.
Twizere, Jean-Claude ULg; Lefebvre, Laurent; Collete, Delphine et al

in Journal of Biological Chemistry (2005), 280(33), 29804-11

Bovine leukemia virus (BLV) tax is an essential gene involved in the transcriptional activation of viral expression. Tax is also believed to be implicated in leukemogenesis because of its ability to ... [more ▼]

Bovine leukemia virus (BLV) tax is an essential gene involved in the transcriptional activation of viral expression. Tax is also believed to be implicated in leukemogenesis because of its ability to immortalize primary cells in vitro. To gain insight into the molecular pathways mediating the activities of this important gene, we identified cellular proteins interacting with Tax. By means of a two-hybrid approach, we show that Tax specifically interacts with MSX2, a general repressor of gene expression. GST pull-down experiments and co-immunoprecipitation assays further confirmed binding specificity. Furthermore, the N-terminal residues 1-79 of MSX2 are required for binding, whereas the C-terminal residues 201-267 of MSX2 do not play a critical role. Whereas the oncogenic potential of Tax in primary cells was only slightly affected by overexpression of MSX2, the other function of Tax, namely LTR-dependent transcriptional activation, was inhibited by MSX2 in human HeLa and bovine B-lymphoblastoid (BL3) cell lines. This MSX2 repression function can be counteracted by overexpression of transcription factors CREB2 and RAP74. The Tax/MSX2 interplay thus results in repression of viral transcriptional activation possibly acting as a regulatory feedback loop. Importantly, this viral gene silencing is not strictly associated with a concomitant loss of Tax oncogenicity as measured by its ability to immortalize primary cells. And interestingly, MSX2 also interacts with and inhibits the transactivation function of the related Tax1 protein encoded by the Human T-cell leukemia virus type 1 (HTLV-1). [less ▲]

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See detailSocial Science Research and Public Policies: the Case of Immigration in Belgium
Florence, Eric ULg; Martiniello, Marco ULg

in International Journal on Multicultural Societies (2005), Vol.7(n°1), 49-67

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See detailInternal Capital Market Efficiency of Belgian Holding Companies
Gautier, Axel ULg; Hamadi, Malika

in Finance (2005), 26(2), 11-34

In this paper, we raise the following two questions. (1) Do Belgian holding companies operate an internal capital market to transfer financial resources amongst their subsidiaries? And if yes, (2) is the ... [more ▼]

In this paper, we raise the following two questions. (1) Do Belgian holding companies operate an internal capital market to transfer financial resources amongst their subsidiaries? And if yes, (2) is the internal capital market efficient? To answer the first question, we check if group cash flow is a determinant of the group members investment spending. The answer is positive if the holding company’s subsidiary is affiliated to a coordination center and negative otherwise. To answer the second question, we evaluate if internal transfers are driven by efficiency. From our estimations, we cannot conclude that Belgian Holding companies have an efficient internal capital market. [less ▲]

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See detailLes acquis scolaires des filles et des garçons en lecture, en mathématiques et en sciences
Blondin, Christiane ULg; Lafontaine, Dominique ULg

in Education et Francophonie (2005), XXXIII(1), 37-57

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See detailLa consommation de pommes de terre en Belgique
Duquesne, Brigitte ULg; Matendo, Sadrac; Burny, Philippe et al

Conference (2005)

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See detailMemory for temporal context : Effects of aging, encoding instructions and retrieval strategies
Bastin, Christine ULg; Van der Linden, Martial ULg

in Memory (2005), 13(1), 95-109

Young and older adults were compared on a list discrimination task. In Experiment 1, performance declined with aging after incidental and intentional encoding of the temporal context. Moreover, there was ... [more ▼]

Young and older adults were compared on a list discrimination task. In Experiment 1, performance declined with aging after incidental and intentional encoding of the temporal context. Moreover, there was no benefit for intentional encoding in either group. In Experiment 2, each list was associated with a different encoding context. There were age differences in performance when participants tried to retrieve the encoding context of the items as a cue for their list of occurrence, but not when participants evaluated temporal distance from the strength of the memory trace. This suggests that the age-related decrease in list discrimination could be at least partly due to a difficulty to infer strategically the temporal context of the items from information encoded in the same time. [less ▲]

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See detailEvolution de la demande en beurre et aspects économiques de la production fermière
Duquesne, Brigitte ULg; Lebailly, Philippe

Conference (2005)

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See detailA physiological overview of the genetics of flowering time control.
Bernier, Georges ULg; Périlleux, Claire ULg

in Plant Biotechnology Journal (2005), 3(1), 3-16

Physiological studies on flowering time control have shown that plants integrate several environmental signals. Predictable factors, such as day length and vernalization, are regarded as 'primary', but ... [more ▼]

Physiological studies on flowering time control have shown that plants integrate several environmental signals. Predictable factors, such as day length and vernalization, are regarded as 'primary', but clearly interfere with, or can even be substituted by, less predictable factors. All plant parts participate in the sensing of these interacting factors. In the case of floral induction by photoperiod, long-distance signalling is known to occur between the leaves and the shoot apical meristem (SAM) via the phloem. In the long-day plant, Sinapis alba, this long-distance signalling has also been shown to involve the root system and to include sucrose, nitrate, glutamine and cytokinins, but not gibberellins. In Arabidopsis thaliana, a number of genetic pathways controlling flowering time have been identified. Models now extend beyond 'primary' controlling factors and show an ever-increasing number of cross-talks between pathways triggered or influenced by various environmental factors and hormones (mainly gibberellins). Most of the genes involved are preferentially expressed in meristems (the SAM and the root tip), but, surprisingly, only a few are expressed preferentially or exclusively in leaves. However, long-distance signalling from leaves to SAM has been shown to occur in Arabidopsis during the induction of flowering by long days. In this review, we propose a model integrating physiological data and genes activated by the photoperiodic pathway controlling flowering time in early-flowering accessions of Arabidopsis. This model involves metabolites, hormones and gene products interacting as long- or short-distance signalling molecules. [less ▲]

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See detailLa statistique dans les pays en développement : regard et perspective
Claustriaux, Jean-Jacques ULg

in Bulletin des séances ARSOM-KAOW (2005), 3

In the context of developing countries, notably in the field of agronomical research, the author suggests some answers to the following questions : is there a specificity in statistics ? What is its ... [more ▼]

In the context of developing countries, notably in the field of agronomical research, the author suggests some answers to the following questions : is there a specificity in statistics ? What is its influence ? How to increase its field impact ? [less ▲]

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See detailQualité de validation des modèles de régression logisitique binaire
Duyme, F.; Claustriaux, Jean-Jacques ULg; Daudin, J.-J.

in Revue de Statistique Appliquée (2005), LIII(3), 91-102

In this paper, we summarize a study of the quality of validation given by binary logistic regression models. We have studied the effect of the proportion of events (ie proportion of individuals having the ... [more ▼]

In this paper, we summarize a study of the quality of validation given by binary logistic regression models. We have studied the effect of the proportion of events (ie proportion of individuals having the code 1) and the way of using data for selecting variables and fitting a model. In particular, we show the interest of leading those two steps separately or not. Artificial data were used to carry out this study. We show that proportion of events influences the quality of the models. Especially, this effect is great when the proportion is very low (5% in our study). We also meet problems like non-convergence of the algorithm when trying to fit a model. However, quality is much better when a proportion equal to 25% or 50% is used. For the latter one, precision of the estimations is even a little bit better and the others studied factors have no effect. The simulations also show that separating selection and fitting is not an interesting strategy because we never obtain a good quality. Difference of quality is however close to 10 per cent. [less ▲]

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See detailLes phénomènes karstiques de Wallonie
Ek, Camille ULg

in Acte du colloque - Karst et aménagement du Territoire. (2005)

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