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See detailL’extinction des servitudes : de nuances en précisions
Lecocq, Pascale ULg

in Journal des Tribunaux (2007)

Les servitudes du fait de l'homme peuvent s'éteindre par non usage trentenaire, celui-ci pouvant d'ailleurs être partiel. L'article étudie ce phénomène d'extinction, en le comparant à d'autres et ... [more ▼]

Les servitudes du fait de l'homme peuvent s'éteindre par non usage trentenaire, celui-ci pouvant d'ailleurs être partiel. L'article étudie ce phénomène d'extinction, en le comparant à d'autres et, notamment, à l'extinction judiciaire d'une servitude pour cause de perte de toute utilité. [less ▲]

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See detailExtinction law classification and lens redshift estimate by means of the principal component analysis
Jean, C.; Surdej, Jean ULg

in Astronomy and Astrophysics (2007), 471(3), 807-812

Aims. We propose a method based on the Principal Component Analysis (PCA) to classify and estimate the redshift of an extinction law in a distant gravitational lens galaxy. Such extinction laws are very ... [more ▼]

Aims. We propose a method based on the Principal Component Analysis (PCA) to classify and estimate the redshift of an extinction law in a distant gravitational lens galaxy. Such extinction laws are very poorly known and an efficient method to characterize them is badly needed. Methods. We first compute the principal axes of an exhaustive collection of redshifted theoretical extinction laws. Then, we project on these new axes the extinction law we wish to classify. The position of its projection among those redshifted extinction laws from the collection allows us to characterize it and to estimate its redshift. Results. Monte Carlo simulations show that the method is efficient and relatively precise for reasonably good signal-to-noise ratio data. The application of the method to a real case, the gravitational lens system SBS 0909+532, leads to very encouraging results. [less ▲]

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See detailThe extinction of ichthyosaurs is a facet of a major Cenomanian turnover in marine ecosystems
Fischer, Valentin ULg

Conference (2013, October)

Untangling geosphere-biosphere interactions is crucial to understand the biodiversity and how it might evolve in a changing environment. But little is known about the possible impact of environmental ... [more ▼]

Untangling geosphere-biosphere interactions is crucial to understand the biodiversity and how it might evolve in a changing environment. But little is known about the possible impact of environmental changes on animals occupying the highest levels of the marine trophic chains. The Cretaceous period offers a fantastic opportunity to investigate such relationship, being characterized by a globally warm but changing climate and a diverse assemblage of aquatic reptiles that underwent profound modifications during this period, ultimately permitting the diversification of the animals dominating nowadays marine ecosystems. The origin, magnitude and nature of these turnovers are poorly understood and have rarely been investigated in a global canvas. Especially, how and why ichthyosaurs, the ‘fish-shaped’ marine reptiles, went extinct at the beginning of the Late Cretaceous has been a mystery for decades. Previous assessments of their diversity suggested ichthyosaurs were already on the decline since the end of the Jurassic; their final extinction was therefore regarded as anecdotal. Several theories have proposed unique biological drivers to this event, including a break in the food chain or competition with other marine vertebrates. The reassessment of the taxonomy, phylogeny and paleoecology Cretaceous ichthyosaurs from Eurasia tells a much different story. Ichthyosaurs were ecologically and taxonomically diverse in several Eurasian ecosystems up to the latest Early Cretaceous. This revision also reveals that their extinction is diachronic, being staggered over four phases that span the entire Cenomanian stage. Detailed comparison with other groups suggests the multiphased extinction of ichthyosaurs is not an isolated event, as was previously assumed, but correlates with profound, multiphased turnovers among other marine animals, such as microplankton, rudists, ammonoids, and pythonomorphs. The diversity and contemporaneity of the biotic responses suggest worldwide physicochemical drivers for this profound reorganization of the marine ecosystems. The extinction of ichthyosaurs therefore appears as one of the facets of a much wider event that affected most of the marine ecosystems during the Cenomanian. [less ▲]

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See detailExtinctions et renouvellements fauniques chez les reptiles marins du Crétacé
Bardet, Nathalie; Fischer, Valentin ULg; Jouve, Stéphane et al

Conference (2011, December)

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See detailExtra-solar planet imaging: ground vs space based coronagraphs
Hanot, Charles ULg; Absil, Olivier ULg; Boccaletti, A. et al

Conference (2010, October 28)

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has ... [more ▼]

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has allowed direct images of several exoplanetary systems to be taken (cf. HR 8799, Fomalhaut and β Pic). In the near future, several new instruments are going to dramatically improve our sensitivity to exoplanet detection. Among these, SPHERE (Spectro Polarimetric High contrast Exoplanet REsearch) at the VLT, MIRI (Mid Infra-Red Instrument) onboard JWST and EPICS at the ELT will be equipped with coronagraphs to reveal faint objects in the vicinity of nearby stars. We made use of the Lyon group (COND) evolutionary models of young (sub-)stellar objects and exoplanets to compare the sensitivities of these different instruments using their estimated coronagraphic profiles. From this comparison, we present a catalogue of targets which are particularly well suited for the different instruments. [less ▲]

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See detailExtra-solar planet imaging: ground vs. space based coronagraphs
Hanot, Charles ULg

Conference (2010, October 28)

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has ... [more ▼]

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has allowed direct images of several exoplanetary systems to be taken (cf. HR 8799, Fomalhaut and β Pic). In the near future, several new instruments are going to dramatically improve our sensitivity to exoplanet detection. Among these, SPHERE (Spectro Polarimetric High contrast Exoplanet REsearch) at the VLT, MIRI (Mid Infra-Red Instrument) onboard JWST and EPICS at the ELT will be equipped with coronagraphs to reveal faint objects in the vicinity of nearby stars. We made use of the Lyon group (COND) evolutionary models of young (sub-)stellar objects and exoplanets to compare the sensitivities of these different instruments using their estimated coronagraphic profiles. From this comparison, we present a catalogue of targets which are particularly well suited for the different instruments. [less ▲]

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See detailExtra-Terrestrial Observations: Reports of national space-research programs 381
Swings, Polydore ULg

in Transactions of the International Astronomical Union. Series B, Proceedings of the general assembly (1962), 11

Detailed reference viewed: 4 (0 ULg)
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See detailAn Extra-trees-based Automatic Target Recognition Algorithm
Pisane, Jonathan ULg; Marée, Raphaël ULg; Ries, Philippe ULg et al

in To appear in Proc. International Radar Conference (2009)

Detailed reference viewed: 107 (31 ULg)
See detailExtracellular amygdala excitatory and inhibitory amino acids change after acute ethanol administration
Quertemont, Etienne ULg; De Witte, Philippe

in Alcohol & Alcoholism (1995), 30

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See detailExtracellular amygdala taurine can be conditioned to stimuli associated with ethanol
Quertemont, Etienne ULg; de Neuville, Jessica; De Witte, Philippe

in Alcoholism, Clinical & Experimental Research (1996), 20

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See detailExtracellular amygdala taurine can be conditioned to stimuli associated with ethanol
Quertemont, Etienne ULg; de Neuville, Jessica; De Witte, Philippe

in Alcoholism, Clinical & Experimental Research (1996), 20

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See detailExtracellular catalase production by Aspergillus phoenicis.
Kacem-Chaouche, N.; Meraihi, Z.; Destain, Jacqueline ULg et al

Poster (2004, May)

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See detailThe extracellular chaperone clusterin potently inhibits human lysozyme amyloid formation by interacting with prefibrillar species
Kumita, Janet R.; Poon, Stephen; Caddy, Gemma L. et al

in Journal of Molecular Biology (2007), 369

We have studied the effects of the extracellular molecular chaperone, clusterin, on the in vitro aggregation of mutational variants of human lysozyme, including one associated with familial amyloid ... [more ▼]

We have studied the effects of the extracellular molecular chaperone, clusterin, on the in vitro aggregation of mutational variants of human lysozyme, including one associated with familial amyloid disease. The aggregation of the amyloidogenic variant I56T is inhibited significantly at clusterin to lysozyme ratios as low as 1:80 (i.e. one clusterin molecule per 80 lysozyme molecules). Experiments indicate that under the conditions where inhibition of aggregation occurs, clusterin does not bind detectably to the native or fibrillar states of lysozyme, or to the monomeric transient intermediate known to be a key species in the aggregation reaction. Rather, it seems to interact with oligomeric species that are present at low concentrations during the lag (nucleation) phase of the aggregation reaction. This behavior suggests that clusterin, and perhaps other extracellular chaperones, could have a key role in curtailing the potentially pathogenic effects of the misfolding and aggregation of proteins that, like lysozyme, are secreted into the extracellular environment. [less ▲]

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See detailExtracellular enveloped vaccinia virus is resistant to complement because of incorporation of host complement control proteins into its envelope
Vanderplasschen, Alain ULg; Mathew, E.; Hollinshead, M. et al

in Proceedings of the National Academy of Sciences of the United States of America (1998), 95

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See detailExtracellular enveloped vaccinia virus. Entry, egress, and evasion
Smith, G. L.; Vanderplasschen, Alain ULg

in Advances in Experimental Medicine and Biology (1998), 440

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See detailExtracellular Matrix in Testicular Differentiation
Pelliniemi, L. J.; Paranko, J.; Grund, S. K. et al

in Annals of the New York Academy of Sciences (1984), 438

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See detailExtracellular matrix proteins and basement membrane identification in bovine ovaries and significance for the attachment of cultured preantral follicles
Figueiredo, J. R.; Hulshof, S. C. J.; Thiry, Marc ULg et al

in Theriogenology (1995), 43(5), 845-858

Described in the present paper is the immunolocalization of the extracellular matrix proteins (e.g., fibronectin, collagen Types I and III) in the bovine ovary, with special attention to preantral ... [more ▼]

Described in the present paper is the immunolocalization of the extracellular matrix proteins (e.g., fibronectin, collagen Types I and III) in the bovine ovary, with special attention to preantral follicles. In addition, we have shown, histochemically and ultrastructurally, that mechanically isolated bovine preantral follicles are surrounded by an intact basement membrane. After 24 h of culture in serum-free medium, only 20.4% of these follicles attached to a plastic substrate. We showed that covering the plastic with extracellular matrix proteins (i.e., fibronectin, collagen Type I and matrigel) significantly increased the percentage of attached follicles to 76.0, 65.2 and 80.4%, respectively, while laminin had no effect (18.6%). When preantral follicles were embedded within three-dimensional collagen gels, no loss of follicles was observed. Restoring surface interactions between preantral follicles and the extracellular matrix in vitro, either in a two- or a three-dimensional system, might be important for maintaining follicular viability and growth in the future. [less ▲]

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See detailExtracellular matrix receptors and mouse skin carcinogenesis: altered expression linked to appearance of early markers of tumor progression.
Tennenbaum, T.; Yuspa, S. H.; Grover, A. et al

in Cancer Research (1992), 52(10), 2966-76

Interaction of cells with the basement membrane is important for cell proliferation and differentiation. Disruption of the basement membrane is an early event during progression of benign tumors to cancer ... [more ▼]

Interaction of cells with the basement membrane is important for cell proliferation and differentiation. Disruption of the basement membrane is an early event during progression of benign tumors to cancer. Using the techniques of immunohistochemistry and immunofluorescence, we show that cell-matrix interactions via the cell surface integrin receptors alpha 3 beta 1, alpha 5 beta 1, alpha 6 beta 4, the Mr 67,000 laminin receptor (67LR) laminin-binding protein, and the secreted matrix protein laminin are strictly regulated during differentiation of mouse epidermis. While alpha 6 beta 4 and alpha 5 beta 1 are polarized to the basal surface of basal cells in contact with the basement membrane, alpha 3 beta 1 and the non-integrin 67LR are primarily detected in the cell periphery of suprabasal cells, where cell to cell contacts are found. Sequential changes in expression of matrix receptors occur following multistage carcinogenesis of mouse skin. In an analysis of benign and malignant skin tumors induced by chemical carcinogens or oncogene transduction, we found that alpha 3 beta 1 and alpha 5 beta 1 as well as the non-integrin 67LR are sequentially down-regulated in the progression from benign to malignant, while alpha 6 beta 4 is the predominant receptor expressed in the carcinomas. Tumor expression of alpha 6 beta 4 is not polarized and is dissociated from its colocalized normal partner bullous pemphigoid antigen, which remains restricted to the basement membrane. The changes in matrix receptors are linked to appearance of keratin 13 in suprabasal regions, but always in alpha 6 beta 4 negative cells. The predominance of alpha 6 beta 4 in the proliferating cells during progression is associated with decreased expression of keratin 13 in carcinomas. These results suggest that matrix interactions with its receptors are important determinants of ordered differentiation in normal skin and show characteristic alterations during carcinogenesis that parallel changes in differentiation of the tumors. [less ▲]

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See detailExtracellular, penicillin-resistant DD-carboxypeptidase from Streptomyces SP [abstract]
Leyh-Bouille, Mélina; Ghuysen, Jean-Marie ULg; Bonaly, R. et al

in Xe Congresso Internacional de Microbiologica - Resumenes - abstracts - résumés (1970)

Detailed reference viewed: 6 (0 ULg)