Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailLes matières colorantes au début du Paléolithique supérieur
Salomon, Hélène ULg; Vignaud, Colette; Coquinot, Yvan et al

in Techné (2008)

A lot of settlements, some of which were occupied as long as 300 000 years ago, yielded small quantities of colouring matter. These quantities increased as time went by and as the palette of colours ... [more ▼]

A lot of settlements, some of which were occupied as long as 300 000 years ago, yielded small quantities of colouring matter. These quantities increased as time went by and as the palette of colours diversified, to reach a remarkable climax during the Upper Palaeolithic. Yet colouring matter has been widely ignored, notwithstanding the great potential information they contain about the technical knowledge, the cognitive capacities, the socio-cultural organisation of prehistoric societies and more generally about aesthetic and symbolic conceptions or  even language. The cave of Chauvet (Ardèche, France) is the most ancient testimony of cave drawing in Europe, with representations whose radiocarbon dating by AMS is 31 000 B.P. The origins of this form of art, which already evidences a perfect graphic mastery, are unknown and cannot be found in the previous periods. We thus have to search for clues of these artistic preoccupations in the colouring matter remains of more ancient cultures. But the use of colouring matter is far from limited to the production of parietal art, that was probably an exception among a large scope of more domestic uses, so far very little studied. We studied then a collection coming from the Chatelperronian layers in the “Grotte du Renne” (Arcy-sur-Cure, France), which was excavated in the 60’ by André Leroi-Gourhan. It is a very rich collection of pigments with various shades, which were systematically collected during the excavation. The ultimate purpose is to reconstitute the gestures that enabled the last Neanderthals in Europe to transform the colouring, abrasive, drying and prophylactic properties of these materials. This methodology also proposes to shed some light on their domestic and symbolic utilisations and to evidence the «chaînes opératoires» in the industry of colouring matter; and thus define the roles and the statutes of these materials in the societies of the Early Upper Palaeolithic period. [less ▲]

Detailed reference viewed: 121 (3 ULg)
Full Text
See detailLes matières colorantes au début du Paléolithique supérieur : sources, transformations et fonctions
Salomon, Hélène ULg

Doctoral thesis (2009)

Abstract : Despite an increasing number of studies, colouring materials are still poorly understood among excavation remains. Their attraction lies in their capacity to bring to light diverse and complex ... [more ▼]

Abstract : Despite an increasing number of studies, colouring materials are still poorly understood among excavation remains. Their attraction lies in their capacity to bring to light diverse and complex skills, but also in their intense colouring power and their contrasting colours : red and black, which still possess a symbolic value. These highly symbolic materials may, therefore, highlight the “conceptual” practices of prehistoric men and give access to their symbolic world and thought. In such a particular context as the transition between the Middle and the Upper Palaeolithic, these remains, which are very abundant in most excavations, offer the possibility, through analysis, to get an exceptional insight into the way of life of the last Neanderthals. The Châtelperronian site of the “Grotte du Renne”, in Arcy-sur-Cure (Yonne), is a landmark. It was excavated beween 1949 and 1963 by André Leroi-Gourhan : Numerous colouring materials were discovered there, and Leroi-Gourhan developed theories about their transformation and uses which so far have not been tested, and have remained unchallenged.Since their discovery, the assumption is that those minerals were heated in a controlled way, in order to modify their colour. It is indeed well-known that heat transforms yellow materials (iron hydroxides) in orange, red or purple materials (iron oxides). From this hypothesis originates the theory according to which Neanderthals exploited colouring materials as pigments for symbolic or even aesthetic purposes. But the theory has so far never been proved true. Our study combines several sets of data, obtained from different methods. Physico-chemical and petrological analyses were carried out on the colouring materials. These data were related to their location on the site, in association with exceptionally well preserved “hut” structures. Furthermore, a series of experimentations, aimed to characterize powders obtained via different methods (grinding and crushing on the one hand, abrasion on the other hand). The comparison of all these data enabled us to identify the various technical choices which informed the supply in colouring minerals in all the Châtelperronian levels of the Grotte du Renne. It was thus possible to demonstrate that none of these materials, either red or black, was heated before being used, contrary to what had been assumed so far. The supply in colouring materials was as carefully organised as for other materials (flint, for example) ; they were collected in geological formations occasionally showing on the surface, at more than 10 km from the cave. The exploitation of these geological sites did not vary during the whole Châtelperronian period, and privileged materials which can easily be ground into powder. Part of their supply was ground coarsely in order to cover large surface areas (soils or hides) as preservative or to clean them up. The remaining materials were destined to more meticulous activities, which required a fine, regular, and highly-colouring powder. In this latter case, the Neanderthals of the Grotte du Renne used those products when working on bone materials (bone or mammoth ivory), and used them also for their sheer colour. The set of colouring minerals from the Grotte du Renne reveals Neanderthals’ in-depth knowledge of materials ; they understood perfectly well their properties and qualities, and used them extensively, so that the Châtelperronian site must have been a literally dazzling sight, all red and black. The “chaîne opératoire” which transpires from our analysis shows very sophisticated techniques, and an advanced “technological” knowledge. They are witness to surprising capacities and a highly-evolved pattern of thought. [less ▲]

Detailed reference viewed: 227 (8 ULg)
Peer Reviewed
See detailLes matières colorantes en contexte Solutréen : Combe Saunière (Dordogne), Fressignes (Indre) et Les Maîtreaux (Indre-et-Loire)
Salomon, Hélène ULg; Vignaud, Colette; Aubry, Thierry et al

in Actes du Colloque : Le Solutréen... 40 ans après la publication du Smith’66 (2013)

Detailed reference viewed: 109 (11 ULg)
See detailLes matières premières lithiques
Bouzouggar, Abdeljalil; Mohib, Abderrahim; Miller, Rebecca ULg et al

in Otte, Marcel; Bouzouggar, Abdeljalil; Kozlowski, Janusz (Eds.) La Préhistoire de Tanger (Maroc) (2004)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailMating behaviour and male mate choice in Tribolium castaneum (Coleoptera, Tenebrionidae).
Arnaud, L.; Haubruge, Eric ULg

in Behaviour (1998), 136(1),

Detailed reference viewed: 21 (2 ULg)
Peer Reviewed
See detailMating Induces Gonadotropin-Releasing Hormone Neuronal Activation in Anosmic Female Ferrets
Bakker, Julie ULg; Kelliher, K. R.; Baum, M. J.

in Biology of Reproduction (2001), 64(4), 1100-5

In females of both spontaneously and induced ovulating species, pheromones from male conspecifics can directly stimulate GnRH neuronal activity, thereby inducing pituitary LH secretion and stimulating the ... [more ▼]

In females of both spontaneously and induced ovulating species, pheromones from male conspecifics can directly stimulate GnRH neuronal activity, thereby inducing pituitary LH secretion and stimulating the onset of estrus. However, whether pheromones contribute to the steroid- or mating-induced preovulatory activation of GnRH neurons is less clear. Previous studies in the ferret, an induced ovulator, raised the possibility that olfactory cues contribute to the ability of genital-somatosensory stimulation to activate GnRH neurons in the mediobasal hypothalamus (MBH). In the present study the percentage of GnRH neurons colabeled with Fos-immunoreactivity (IR), used as a marker for neuronal activation, was investigated in the MBH of mated gonadectomized, estradiol-treated female ferrets in which both nares were occluded. In addition, the percentage of GnRH neurons colabeled with Fos-IR was examined in the MBH of gonadectomized, estradiol-treated female ferrets exposed to male bedding. Bilateral nares occlusion successfully blocked mating or odor-induced increments in Fos-IR in central olfactory regions, including the cortical and medial amygdala. By contrast, the percentage of GnRH neurons expressing Fos-IR did not differ between mated nares- and sham-occluded females. Exposure to male bedding alone failed to induce Fos-IR in MBH GnRH neurons. Thus, the mating-induced preovulatory activation of GnRH neurons in the female ferret's MBH appears to rely solely on genital-somatosensory as opposed to olfactory inputs. [less ▲]

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailMating patterns of first-generation hybrids of the roach, Rutilus rutilus (L.), and the silver bream, Blicca bjoerkna (L.)
Nzau Matondo, Billy; Ovidio, Michaël ULg; Philippart, Jean-Claude ULg et al

in Journal of Ethology (2008), 26(1), 179-183

Mating patterns among first-generation hybrids of the roach, Rutilus rutilus, and the silver bream, Blicca bjoerkna, between hybrids or with parent-species males, have been investigated under experimental ... [more ▼]

Mating patterns among first-generation hybrids of the roach, Rutilus rutilus, and the silver bream, Blicca bjoerkna, between hybrids or with parent-species males, have been investigated under experimental reproduction conditions. The results reveal that the level of sexual activity of these hybrids is high. Hybrid females mated simultaneously and successively with all types of male, resulting in fertilised eggs. Individual participation of roach males in mating was never observed, however. [less ▲]

Detailed reference viewed: 51 (7 ULg)
Peer Reviewed
See detailMating system of Calluna vulgaris (L.) Hull : self-sterility and outcrossing estimations
Mahy, Grégory ULg; Jaqcuemart, Anne Laure

in Canadian Journal of Botany (1998), 76

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
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

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailMating-Induced Fos and Aromatase Are Not Co-Localized in the Preoptic Area
Foidart, Agnès ULg; Meddle, S. L.; Balthazart, Jacques ULg

in Neuroreport (1999), 10(5), 907-12

Male sexual behavior is determined by the interaction of endocrine and environmental stimuli originating from the female, yet it is unknown how and where these stimuli are integrated within the brain ... [more ▼]

Male sexual behavior is determined by the interaction of endocrine and environmental stimuli originating from the female, yet it is unknown how and where these stimuli are integrated within the brain. Activation of copulatory behavior by testosterone is limited by its central aromatization into an estrogen in the preoptic area. We investigated whether mating-induced neuronal activation as identified by the expression of the immediate early gene Fos occurs in aromatase-immunoreactive (ARO-ir) cells of the male quail preoptic area. Fos-immunoreactive (ir) cells were observed within and lateral to these ARO-ir cells groups but few ARO-ir cells contained Fos-ir indicating that mating-related stimuli do not directly affect estrogen-synthesizing cells. [less ▲]

Detailed reference viewed: 10 (1 ULg)
Full Text
See detailMatisse
Lopez, B.; Lagarde, S.; Wolf, S. et al

in Moorwood, 1 (Ed.) Science with the VLT in the ELT Era (2009)

MATISSE is foreseen as a mid-infrared spectro-interferometer combining the beams of up to four UTs/ATs of the Very Large Telescope Interferometer (VLTI). MATISSE will measure closure phase relations and ... [more ▼]

MATISSE is foreseen as a mid-infrared spectro-interferometer combining the beams of up to four UTs/ATs of the Very Large Telescope Interferometer (VLTI). MATISSE will measure closure phase relations and thus offer an efficient capability for image reconstruction in the L, M and N bands of the mid-infrared domain. [less ▲]

Detailed reference viewed: 14 (0 ULg)
Full Text
See detailMATISSE Science Cases
Wolf, S.; Lopez, B.; Jaffe, W. et al

in Moorwood, A. (Ed.) Science with the VLT in the ELT Era (2009)

MATISSE is foreseen as a mid-infrared spectro-interferometric instrument combining the beams of up to four UTs/ATs of the Very Large Telescope Interferometer (VLTI). MATISSE will measure closure phase ... [more ▼]

MATISSE is foreseen as a mid-infrared spectro-interferometric instrument combining the beams of up to four UTs/ATs of the Very Large Telescope Interferometer (VLTI). MATISSE will measure closure phase relations and thus offer an efficient capability for image reconstruction. In addition to this, MATISSE will open 2 new observing windows at the VLTI: the L and M band in addition to the N band. Furthermore, the instrument will offer the possibility to perform simultaneous observations in separate bands. MATISSE will also provide several spectroscopic modes. In summary, MATISSE can be seen as a successor of MIDI by providing imaging capabilities in the mid-infrared domain (for a more detailed description of MATISSE see Lopez et al., these proceedings). [less ▲]

Detailed reference viewed: 12 (0 ULg)
Full Text
See detailMatonge, de la distinction au stigmate (portrait)
Demart, Sarah ULg

in migrations magazine (2011), Autumn

Detailed reference viewed: 12 (0 ULg)
Peer Reviewed
See detailMatonge, un quartier congolais dans la ville de Bruxelles
Demart, Sarah ULg

Conference (2009)

Detailed reference viewed: 30 (1 ULg)
Full Text
See detailMatonge: de la distinction au stigmate
Demart, Sarah ULg

in migrations magazine (2013), 11(autumn),

Detailed reference viewed: 23 (1 ULg)
Full Text
See detailLa matrice cachée de Google
Rigo, Michel ULg

Learning material (2008)

Inutile de le présenter : Google est le moteur de recherche le plus connu et le plus utilisé au monde. Mais comment les concepteurs de Google font-ils pour classer les milliers de pages se rapportant à un ... [more ▼]

Inutile de le présenter : Google est le moteur de recherche le plus connu et le plus utilisé au monde. Mais comment les concepteurs de Google font-ils pour classer les milliers de pages se rapportant à un mot-clé donné, de façon telle que les pages les plus représentatives occupent toujours les premières positions du classement ? Ce tour de force repose sur de véritables résultats mathématiques combinant théorie des graphes et algèbre linéaire. [less ▲]

Detailed reference viewed: 273 (8 ULg)
Full Text
Peer Reviewed
See detailUne matrice conceptuelle de la négociation. Du marchandage à la négociation valorielle
Kuty, Olgierd ULg

in Négociations (2004), 1(1), 45-62

Detailed reference viewed: 50 (3 ULg)
Full Text
See detailLes matrices identificatoires à l’oeuvre dans le mouvement ouvrier chrétien à l’heure du déclin du cléricalisme (1968-1996). Les relais politiques des organisations ouvrières chrétiennes en Wallonie.
Verjans, Pierre ULg

Doctoral thesis (1987)

Le mouvement ouvrier chrétien, coupole de la confédération des syndicats chrétiens, de l'alliance nationale des mutualités chrétiennes, des coopératives chrétiennes, des jeunesses ouvrières chrétiennes ... [more ▼]

Le mouvement ouvrier chrétien, coupole de la confédération des syndicats chrétiens, de l'alliance nationale des mutualités chrétiennes, des coopératives chrétiennes, des jeunesses ouvrières chrétiennes, de Vie féminine et des Equipes populaires, a souvent été vu comme le pilier social du parti social chrétien. A l'inverse, celui-ci lui servait de relais politique privilégié. L'étude montre que le mouvement ouvrier chrétien a été déchiré par des tensions politiques fortes qui ont fait préférer à plusieurs dirigeants d'autres relais politiques que le PSC. [less ▲]

Detailed reference viewed: 25 (4 ULg)