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See detailLes oiseaux des Hautes-Fagnes. Histoire et géographie des oiseaux nicheurs
Metzmacher, Maxime ULg

Book published by Eole (2004)

Depuis plus d’un siècle, certains sites naturels ou semi-naturels focalisent l’attention des artistes, des scientifiques et des simples promeneurs. Le plateau de Hautes-Fagnes est un de ceux-là (Quenon et ... [more ▼]

Depuis plus d’un siècle, certains sites naturels ou semi-naturels focalisent l’attention des artistes, des scientifiques et des simples promeneurs. Le plateau de Hautes-Fagnes est un de ceux-là (Quenon et al. 1994). L’abondante littérature, qui lui est consacrée, en témoigne (Streel 2002). Mais cet intérêt est inégal : sa flore et sa végétation, plus directement observables, sont aussi beaucoup mieux connues que sa faune. Les oiseaux n’ont toutefois pas été ignorés car, en 1971, Fontaine avait déjà enrichi l’ornithologie fagnarde d’une première esquisse de l’avifaune nicheuse. En réponse à l’abandon de certaines pratiques agro-pastorales, il soulignait l’évolution sensible du couvert végétal, et son influence probable sur la distribution et l’abondance de certaines espèces d’oiseaux. Depuis, le tourisme s’est développé en Haute-Ardenne – proche d’importants centres urbains – et a accru sa pression sur les milieux, en principe protégés, comme la Réserve naturelle domaniale des Hautes-Fagnes. À la fin des années 1980, face à ces diverses mutations, la Région wallonne charge la Station scientifique des Hautes-Fagnes d’élaborer un plan de gestion de cette réserve, noyau et fleuron du parc naturel Hautes-Fagnes – Eifel. Dans ce but, cette station rassemble et synthétise les informations scientifiques disponibles, dresse ou complète les cartes de végétation. Bref, pour remplir sa mission, elle explore tout à la fois le terrain, la littérature et 64 ans de ses archives. Des bénévoles et plusieurs associations naturalistes viendront aussi épauler ses efforts. Parmi ceux-ci, un groupe d’ornithologues amateurs, coordonné par l’asbl Etudes et Environnement, entreprend de cartographier les oiseaux nicheurs du Haut-Plateau et d’évaluer les prévisions de Fontaine. Début des années 1990, aux termes de cette enquête, l’association produit un rapport à diffusion confidentielle. Il faudra attendre 2003 pour trouver les moyens de l’éditer. Comme un atlas ne constitue pas "une fin en soi, mais le moyen d’en connaître davantage" (Blondel et Huc 1978), le projet initial est modifié : l’ouvrage se double d’un essai consacré à quelques facteurs susceptibles d’influencer la dynamique des populations d’oiseaux nicheurs, tant dans l’espace que dans le temps. Cet essai se veut, à partir de l’étude de cas, une introduction à ce vaste et complexe sujet. [less ▲]

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See detailOiseaux et êtres ailés au Rorschach
Mormont, Christian ULg

in Feuillets Psychiatriques de Liège (1970), 3

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See detailOK3: Méthode d’arbres à sortie noyau pour la prédiction de sorties structurées et l’apprentissage de noyau
Geurts, Pierre ULg; Wehenkel, Louis ULg; d'Alché-Buc, Florence

in Proc. of CAP (Conférence francophone d'apprentissage) (2006)

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See detailThe Oka varicella vaccines are more equal than different
Rentier, Bernard ULg; Gershon, Anne A.

in Vaccine (2004), 22(25-26), 3225-3226

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See detailOkadaic acid, a protein phosphatase inhibitor, enhances transcription of a receptor gene containing sequence A of the human prolactin promoter
Wera, S.; Belayew, A.; Martial, Joseph ULg

in Molecular Endocrinology (1993), 7(8), 965-71

Human PRL (hPRL) gene expression is controlled by cAMP and Ca2+. This control is mediated by two cis-elements: a Pit-1 binding site (-62 to -35) and sequence A (-110 to -85), present in the hPRL promoter ... [more ▼]

Human PRL (hPRL) gene expression is controlled by cAMP and Ca2+. This control is mediated by two cis-elements: a Pit-1 binding site (-62 to -35) and sequence A (-110 to -85), present in the hPRL promoter. We have investigated whether protein phosphatases could be involved in this regulation. GC-type rat pituitary tumor cells were transfected with sequence -138 to -35 of the hPRL gene promoter, upstream from a thymidine kinase promoter and a chloramphenicol acetyltransferase (CAT) reporter gene. Addition of okadaic acid (OA), a specific inhibitor of protein phosphatases 1 and 2A, stimulates transient expression of the CAT gene. The dose-response curve shows a maximal effect at 25 nM OA (2.2-fold stimulation above controls). The OA effect is also observed with a natural 4500-base pair hPRL promoter. A single copy of the hPRL promoter sequence -115 to -85 (sequence A) confers to a thymidine kinase-CAT construct an identical response to OA, whereas a single copy of the proximal Pit-1 binding site does not. Synergism is observed between cAMP and OA in activating PRL gene transcription. This synergism is also observed with a single copy of sequence A. The effect of cAMP is not mediated by an L-type Ca2+ channel, since addition of the Ca2+ channel antagonist verapamil does not decrease it, nor does complexing extracellular Ca2+ significantly reduce it. Furthermore, OA and the Ca2+ channel opener BAY K8644 exert additive effects. [less ▲]

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See detailL’Okeanos végétalisé. Elaboration d’un thème iconographique
Derwael, Stéphanie ULg

Scientific conference (2012, November 16)

L’important développement que connaît la figure du dieu Océan dans la littérature latine du Ier siècle apr. J.-C., est contemporain de l’émergence d’un nouveau type iconographique : l’Okeanos végétalisé ... [more ▼]

L’important développement que connaît la figure du dieu Océan dans la littérature latine du Ier siècle apr. J.-C., est contemporain de l’émergence d’un nouveau type iconographique : l’Okeanos végétalisé. Cette innovation romaine s’impose rapidement comme la formulation plastique de son rôle de divinité primordiale, pourvoyeuse de toute vie et garante de prospérité. Le motif connaît alors une longue postérité dans l’art romain, où son utilisation semble répondre à certains schémas codifiés. L’étude de son cheminement nous mènera à travers des supports aussi variés que la mosaïque, la sculpture ou encore la céramique, et permettra ainsi de mieux comprendre les différentes phases d’élaboration et de diffusion d’un thème iconographique, de sa naissance à sa dissolution. [less ▲]

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See detailOkri, Ben (1959-)
Tunca, Daria ULg

in Juang, Richard M.; Morrissette, Noelle (Eds.) Africa and the Americas: Culture, Politics, and History (2008)

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See detailOld and new issues in differential item functioning (DIF): How to overcome current research conservatism?
Magis, David ULg

Scientific conference (2010, October 05)

In the context of differential item functioning (DIF), some issues have been pointed out more than 20 years ago, whereas other ones have appeared much more recently (often due to an incredible increase of ... [more ▼]

In the context of differential item functioning (DIF), some issues have been pointed out more than 20 years ago, whereas other ones have appeared much more recently (often due to an incredible increase of available information). In addition, there is some uprising evidence that the topic of DIF is becoming less attractive for journal editors. Explaining the reasons for this lack of interest in DIF, and why it should be actively countered, are the main goals of this talk. Three specific issues will be discussed: (a) the supremacy of the Mantel-Haenszel method, (b) the problem of item purification, and (c) the identification of DIF among multiple groups. Some recent and ongoing research results will be discussed to highlight why DIF should not be left alone in the years to come. [less ▲]

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See detailOld Cairo Development Project
Attia, Shady ULg; Zakareya, Mona

Diverse speeche and writing (2003)

Article about the development of Old Cairo, the historic centre in Cairo, Egypt. (arabic).

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See detailThe Old English copula weorðan and its replacement in Middle English
Petré, Peter ULg; Cuyckens, Hubert

in Gotti, Maurizio; Dossena, Marina; Dury, Richard (Eds.) English historical linguistics 2006. Volume I Historical syntax and morphology. Selected papers from the fourteenth International Conference on English Historical Linguistics (ICEHL 14), Bergamo, 21-25 August 2006 (2008)

With the aid of a specially compiled corpus, this paper accounts for the replacement – mainly by become – of weorðan ‘become’, whose use rapidly decreased in Middle English. Drawing on Goldbergian ... [more ▼]

With the aid of a specially compiled corpus, this paper accounts for the replacement – mainly by become – of weorðan ‘become’, whose use rapidly decreased in Middle English. Drawing on Goldbergian construction grammar, the paper posits the existence of a lexeme-independent network of copular constructions [Copula + np/ap/…]. Copular uses of weorðan are associated with this network, but also form part of a second network exclusive to weorðan, which, already in Old English, served as a model for the extension of becuman to copular uses. In early Middle English, weorðan reacted to changes in the lexeme-independent copular network. Weorðan was no longer used with adjectival participles when these were constructionally separated from its most frequent collocates, namely human propensity adjectives. Furthermore, reacting to an influx of various adjectives in predicate position, becuman, which had no collocational preferences, extended its use to these adjectives and eventually took over from weorðan completely. [less ▲]

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See detailThe Old Halo metallicity gradient: the trace of a self-enrichment process
Parmentier, Geneviève ULg; Jehin, Emmanuel ULg; Magain, Pierre ULg et al

in Astronomy and Astrophysics (2000), 363

Based on a model of globular cluster self-enrichment published in a previous paper, we present an explanation for the metallicity gradient observed throughout the galactic Old Halo. Our self-enrichment ... [more ▼]

Based on a model of globular cluster self-enrichment published in a previous paper, we present an explanation for the metallicity gradient observed throughout the galactic Old Halo. Our self-enrichment model is based on the ability of globular cluster progenitor clouds to retain the ejecta of a first generation of Type II Supernovae. The key point is that this ability depends on the pressure exerted on the progenitor cloud by the surrounding protogalactic medium and therefore on the location of the cloud in the protoGalaxy. Since there is no significant (if any) metallicity gradient in the whole halo, we also present a review in favour of a galactic halo partly built via accretions and mergers of satellite systems. Some of them bear their own globular clusters and therefore ``contaminate'' the system of globular clusters formed ``in situ'', namely within the original potential well of the Galaxy. Therefore, the comparison between our self-enrichment model and the observational data should be limited to the genuine galactic globular clusters, the so-called Old Halo group. [less ▲]

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See detailOld inks: pigments extracted from plants
Despy, Jessica; Wymeersch, Noémie; Bouchat, Isabelle et al

in BOOK OF SHORT ABSTRACTS - POSTER PRESENTATIONS 19TH NATIONAL SYMPOSIUM ON APPLIED BIOLOGICAL SCIENCES (2014, February 07)

Thousands of years ago, natural pigments were discovered and they have been used ever since. Indeed, prehistoric people already used them to paint the walls of the caves in which they were living. A ... [more ▼]

Thousands of years ago, natural pigments were discovered and they have been used ever since. Indeed, prehistoric people already used them to paint the walls of the caves in which they were living. A significant example of this is the Cosquer cave (-19,000 to -27,000 years) located near Marseilles. Pigments and dyes can be classified into two broad categories and five families: natural pigments and dyes and those called artificial. The first one of these five families includes the mineral pigments. Among these we can find the clays (yellow ochre, red ochre, green clay, brown clay) and the stones like lapis lazuli (blue). The second and third families gather the organic dyes and pigments. Those that have vegetal origins like indigo (blue) and madder (red) compose the second family and those that have animal origins like cochineal (red) and kermes dyers (carmine) form the third family. One family includes pigments and dyes stemming from chemical reactions such as verdigris or red lead (family 4) and the other one is made of the miscellaneous inks such as iron-gall type who are vegetal and mineral one (family 5). All these pigments, although they have been used for centuries, have been replaced by synthetic dyes from the oil industry at the end of the 19th century. Indeed, they have the advantage of reproducibility of the properties unlike natural pigments. But the scarcity of oil causes a renewed interest in natural preparations. We report the extraction of pigments from plants. [less ▲]

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See detailOld inks: plant-based inks
Wymeersch, Noémie; Despy, Jessica; Bouchat, Isabelle et al

Poster (2013, November 27)

Thousands of years ago, natural pigments were discovered and they have been used ever since. Indeed, prehistoric people already used them to paint the walls of the caves in which they were living. A ... [more ▼]

Thousands of years ago, natural pigments were discovered and they have been used ever since. Indeed, prehistoric people already used them to paint the walls of the caves in which they were living. A significant example of this is the Cosquer cave (-19,000 to -27,000 years) located near Marseilles (France). Pigments and dyes can be classified into two broad categories: natural pigments and dyes and those called artificial. These categories are then subdivided into five families. The first one of these five families includes the mineral pigments. Among these we can find the clays (yellow ochre, red ochre, green clay, brown clay) and the stones like lapis lazuli (blue) and malachite (green). The second and third families gather the organic dyes and pigments. Those that have vegetal origins like indigo (blue), weld (yellow) and madder (red) compose the family 2 and those that have animal origins like cochineal (red) and kermes dyers (carmine) form the family 3. One family includes pigments and dyes stemming from chemical reactions such as verdigris or red lead (family 4) and the other one is made of the miscellaneous inks such as iron-gall type who are vegetal and mineral one (family 5). All these pigments, although they have been used for centuries, have been replaced by synthetic dyes from the oil industry at the end of the 19th century. Indeed, they have the advantage of reproducibility of the properties unlike natural pigments. But the scarcity of oil causes a renewed interest in natural preparations. In such purpose, our laboratory in conjunction with the Abbey of Villers-la-Ville has decided to study natural derivatives for inks and focuses in particular on the extraction of pigments from plants. [less ▲]

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See detailOlder adults, physical activity and the internet: Exploring their behaviours, beliefs and opinions
Mouton, Alexandre ULg; Cloes, Marc ULg

in International Journal of Physical Education (2014), 51(1), 18-29

Despite the numerous health benefits, population physical activity (PA) levels are low and decline with age. As the population grows older, with some major implications in terms of public health cost ... [more ▼]

Despite the numerous health benefits, population physical activity (PA) levels are low and decline with age. As the population grows older, with some major implications in terms of public health cost, innovative interventions to promote PA in older adults are of major interest. The Internet holds potential for delivering effective PA interventions and older adults are the largest-growing group of Internet users. Therefore, the main purpose of this study was to explore the older adults’ behaviours, beliefs and opinions about PA and Internet. At baseline, 75 older adults participated in the two stages of the study: (1) an assessment of their behaviours and beliefs about PA and web-based PA promotion; and (2) the experimentation of a single session of home-exercising followed by an interview regarding their opinion on this session. Results exposed that a minority of the participants were regularly active according to the stage of change for PA. Depending on their knowledge of PA, participants mainly perceived social and health aspects as barriers or motivators for their practice of PA. Senior adults considered home-exercising delivered via the Internet sufficiently relevant, acceptable, original, appreciated and reproducible only if it goes along with a reinforced social support and a community-centred PA promotion. [less ▲]

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See detailOLED Light extraction improvement with surface nano-micro texturation based on speckle lithography.
Loicq, Jerôme ULg; Fleury-Frenette, Karl ULg; Viville, Pascal et al

in Physiscs and Optics of OLEDs (2012)

Part of the light rays generated within a luminescent medium with a higher refractive index than that of the exit medium, typically air, undergo total internal reflection phenomenon (TIR); these rays will ... [more ▼]

Part of the light rays generated within a luminescent medium with a higher refractive index than that of the exit medium, typically air, undergo total internal reflection phenomenon (TIR); these rays will be trapped and guided into the emissive material and will not be extracted out of an OLED device for instance. Trapped light is reabsorbed and eventually converted into heat that will be detrimental to the device performance and lifetime. The amount of trapped energy is highly dependent on the values of the refractive indices involved in the multilayer stack constituting the light emitting device. The amount of trapped energy can be extensive and can even reach as much as 75% in certain cases. Solutions to improve the outcoupling efficiency are therefore attractive. In this paper we propose to use laser speckle to produce a random surface with controlled parameters to enhance the OLED outcoupling. A laser speckle pattern is transferred onto a photoresist which will be subsequently converted into a surface relief profile. The optical setup parameters drive the properties of such surface and thus the outcoupling properties. The resulting surface has a quasi-random shape which could be assimilated to a corrugated surface. We will show that these typical surfaces exhibit light extraction enhancement properties. The generated pattern is then transferred onto the exit interfaces of the emitting device. An extraction improvement close to a factor 3 is measured. We finally discuss a practical case for which the laser speckle shape is applied to texture the surface of encapsulating cover glasses in a top-emitting OLED on steel substrates. [less ▲]

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See detailOlefin cyclopropanation and insertion into O-H bonds mediated by copper(I) and palladium(II) covalently anchored to silica xerogels
Sacco, Luigi; Lambert, Stéphanie ULg; Pirard, Jean-Paul ULg et al

in Journal of Catalysis (2005), 232(1), 51-59

Copper(I) and palladium(II) ligated to pyrazolylpyridine hearing a tethered (trimethoxysilyl)propyl group in position 4 of the pyrazole ring were chemically bonded to silica via a sol-gel process. The ... [more ▼]

Copper(I) and palladium(II) ligated to pyrazolylpyridine hearing a tethered (trimethoxysilyl)propyl group in position 4 of the pyrazole ring were chemically bonded to silica via a sol-gel process. The textural properties of the materials (Specific Surface area, porous volume, and pore size distribution) were characterized by nitrogen adsorption-desorption isotherms, mercury porosimetry, and TEM analysis. The hybrid materials were tested as catalysts in olefin cyclopropanation and as potential chemoselective catalysts in the reaction with unsaturated alcohols (double bond versus -OH group), with ethyl diazoacetate as a carbene precursor, and compared with the corresponding homogeneous complexes. © 2005 Elsevier Inc. All rights reserved. [less ▲]

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