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
See detailEtude comparative des pâtes de bambou
TsHiamala, T.; Thonart, Philippe ULg; Paquot, Michel ULg et al

in Hlzforshung (1984)

Detailed reference viewed: 14 (2 ULg)
Full Text
Peer Reviewed
See detailEtude comparative des performances de production laitiere de brebis de race Mouton Laitier Belge avec celles de brebis de race Lacaune.
Gillon, Alain ULg; Rondia, Pierre; Gengler, Nicolas ULg et al

in 14ièmes Recontres Recherches Ruminants, Paris, les 5 et 6 Décembre 2007 (2007, December)

La Wallonie compte une dizaine de producteurs de lait de brebis avec un cheptel variant de 30 à 250 individus par exploitation, pour la plupart de race « Mouton Laitier Belge » (MLB). Il s’agit d’un ... [more ▼]

La Wallonie compte une dizaine de producteurs de lait de brebis avec un cheptel variant de 30 à 250 individus par exploitation, pour la plupart de race « Mouton Laitier Belge » (MLB). Il s’agit d’un animal de type exclusivement laitier qui s’apparente fortement au mouton laitier frison dont l’effectif s’élève à un millier de têtes. La présence simultanée de brebis Lacaune (LAC) et de brebis MLB sur une même exploitation a permis la comparaison de leurs performances respectives grâce à une maîtrise du facteur « mode de conduite ». L’effectif restreint des populations étudiées constitue une limite à une extrapolation des résultats à l’ensemble des individus des races concernées mais donne néanmoins une certaine indication de leur potentiel de production respectif en région wallonne. [less ▲]

Detailed reference viewed: 312 (8 ULg)
Full Text
Peer Reviewed
See detailEtude comparative des performances des sociétés de chemins de fer
Gathon, Henry-Jean ULg; Perelman, Sergio ULg

in Annals of Public and Cooperative Economics = Annales de l'Economie Publique, Sociale et Coopérative (1989), (60), 61-80

Detailed reference viewed: 25 (5 ULg)
Peer Reviewed
See detailEtude comparative des performances en contraste sur vue planaire de 32 détecteurs de 20 caméras scintigraphiques.
Seret, Alain ULg

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2005), 29(11), 711

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailEtude comparative des qualités musculaires entre populations fibromyalgique et lombalgique
Maquet, Didier ULg; Demoulin, Christophe ULg; Croisier, Jean-Louis ULg et al

in Revue du Rhumatisme (2006), 73

Introduction : La fibromyalgie et la lombalgie constituent deux affections musculo-squelettiques chroniques présentant de nombreuses similitudes, comme la douleur, la régression des activités physiques ... [more ▼]

Introduction : La fibromyalgie et la lombalgie constituent deux affections musculo-squelettiques chroniques présentant de nombreuses similitudes, comme la douleur, la régression des activités physiques quotidiennes ou encore la désinsertion sociale. L’objectif de ce travail était de comparer des patients fibromyalgiques et des patients souffrant de lombalgies chroniques en termes de qualités musculaires à partir de mesures de force et de fatigabilité musculaires. Patients et méthodes : Vingt sujets contrôles de sexe féminin, vingt patientes fibromyalgiques et vingt patientes souffrant de lombalgies chroniques sont inclus dans l’étude. Le protocole comporte une évaluation de la force maximale isocinétique des muscles fléchisseurs et extenseurs de genou. La résistance musculaire à la fatigue s’apprécie par l’enchaînement de 30 mouvements consécutifs de flexion-extension de genou à intensité maximale. Les perceptions douloureuses et de pénibilité de l’effort sont respectivement mesurées à partir des échelles visuelle analogique (EVA) et de Borg. En outre, l’anxiété et la dépression sont déterminées à partir de l’ « Hospital Anxiety and Depression Scale » (HAD). Résultats : L’ensemble des performances de force et de fatigabilité apparaissent inférieures chez les fibromyalgiques, en comparaison non seulement des sujets contrôles mais aussi des patientes lombalgiques. Ces dernières développent des performances identiques à celles de la population contrôle. Les scores douloureux (EVA) et de pénibilité de l’effort apparaissent pourtant significativement augmentés au sein de ces deux populations pathologiques. Les questionnaires d’anxiété et de dépression (HAD) révèlent des scores significativement supérieurs chez les fibromyalgiques. Discussion : Ces résultats illustrent un profil musculaire différent entre populations fibromyalgique et lombalgique. La réduction majeure des performances développées par les patientes fibromyalgiques peut être mise en relation avec l’état de déconditionnement, les scores d’anxiété et de dépression, la douleur diffuse et d’éventuels mécanismes d’inhibition musculaire. Contrairement à certaines données de la littérature, nous observons des performances musculaires des membres inférieurs relativement préservées chez les patientes lombalgiques. Conclusion : Au terme de cette étude comparative entre populations souffrant de douleurs chroniques, nous démontrons de faibles performances musculaires développées par les membres inférieurs chez les sujets fibromyalgiques. Une mesure des qualités musculaires rachidiennes peut s’avérer plus spécifique dans l’établissement du profil musculaire du lombalgique. [less ▲]

Detailed reference viewed: 103 (8 ULg)
Full Text
Peer Reviewed
See detailÉtude comparative des « prick » et « patch » tests aux moisissures, aux dermatophytes et aux levures dans la dermatite atopique de la tête et du cou, la dermatite séborrhéique et le sébopsoriasis
Dezfoulian, Bita ULg; de LA BRASSINNE, Michel ULg

in Revue Française d'Allergologie et d'Immunologie Clinique (2005), 45

Aim of the study. – The capacity of fungi to induce eczema in head and neck dermatitis has already been studied. Malassezia has often been implicated in two other dermatitis of the cephalic region ... [more ▼]

Aim of the study. – The capacity of fungi to induce eczema in head and neck dermatitis has already been studied. Malassezia has often been implicated in two other dermatitis of the cephalic region (seborrhoeic dermatitis and sebopsoriasis).We have explored the cellular and IgE dependant reactions to different groups of fungi in these three dermatitis using “patch” and “prick” tests. Tested allergens were: Alternaria, Penicillium, Aspergillus, Cladosporium, Trichophyton, Epidermophyton, Candida albicans, Malassezia, Saccharomyces cerevisiae. Material and methods. – Seventy persons including 42 females (60%) and 28 males (40%) aged 40 years old in average were distributed in four groups: Head and neck dermatitis (24 patients), seborrheic dermatitis of the face (21 patients) and sebopsoriasis of the face (10 patients) compared to 15 controls without these dermatoses. Results and conclusions. – Globally, in “prick” and “patch” tests, yeasts had the highest number of positivity comparing to the two other groups. Malassezia was the leader in “prick tests”. In “patch tests”, the global results showed a positivity rate, which was clearly lower than those in “prick tests”. Detailed analysis of the results revealed that in the head and neck dermatitis the highest number of positive “patch tests” for all of these allergens is found. For the three other groups, no significant difference for these two techniques for any of these allergens has been detected. [less ▲]

Detailed reference viewed: 50 (3 ULg)
See detailEtude comparative du chant imitatif de deux espèces du genre Acrocephalus : le phragmite des joncs (A. schoenobaenus) et la rousserolle effarvatte (A. scirpaceus).
Delcourt, Johann ULg

Master's dissertation (2002)

Nous avons réalisé, à partir d'échantillons de chants enregistrés sur le terrain, une étude comparative des capacités imitatives du phragmite des joncs et de la rousserolle effarvatte. Ces deux espèces ... [more ▼]

Nous avons réalisé, à partir d'échantillons de chants enregistrés sur le terrain, une étude comparative des capacités imitatives du phragmite des joncs et de la rousserolle effarvatte. Ces deux espèces occupant un habitat très similaire et vivant donc dans un environnement sonore comparable, nous avons postulé l'hypothèse que leurs caractéristiques imitatrices seraient similaires. Nous confirmons le caractère imitatif du chant chez les deux espèces (incorporation de motifs extraspécifiques). Cependant, nous avons mis en évidence que l'effarvatte présente moins d'imitations (environ 10 % de son répertoire) que le phragmite des joncs (40 % de son répertoire). Nous avançons une série de contraintes, au niveau physique, au niveau des capacités intrinsèques des espèces, au niveau social intra- et interspécifique, qui pourraient expliquer cette différence. Les contraintes les plus importantes semblent être la gamme de fréquence utilisés par l'imitateur et le processus de spéciation entre les deux espèces jumelles, la rousserolle verderolle et la rousserolle effarvatte. [less ▲]

Detailed reference viewed: 30 (2 ULg)
See detailEtude comparative entre les différentes méthodes d'estimation de la distance minimum d'implantation pour des bâtiments d'élevage par rapport aux zones d'habitat et aux habitations isolées
Nicolas, Jacques ULg

Report (2002)

La première partie de l'étude est une recherche bibliographique sur les différentes formules de calcul de la distance maximale d'acceptation de l'odeur d'élevage entre les bâtiments de la ferme et les ... [more ▼]

La première partie de l'étude est une recherche bibliographique sur les différentes formules de calcul de la distance maximale d'acceptation de l'odeur d'élevage entre les bâtiments de la ferme et les habitations les plus proches. Neuf méthodes ont été particulièrement étudiées (France, Allemagne, Hollance, Québec, Autriche, Suisse, Flandre, ...) et détaillées. Elles ont été appliquées et comparées sur deux études de cas. [less ▲]

Detailed reference viewed: 50 (3 ULg)
Peer Reviewed
See detailEtude comparative pour le transport de conteneurs au départ de Liège vers la Grande-Bretagne
Marchal, Jean ULg

in Bulletin du BIVEC (Groupement Benelux des Economistes des Transports) (1987)

Detailed reference viewed: 12 (6 ULg)
Full Text
See detailEtude comparée de l’écologie de deux espèces jumelles de Chiroptères (Mammalia : Chiroptera ) en Belgique: l’oreillard roux (Plecotus auritus) (Linn., 1758) et l’oreillard gris (Plecotus austriacus ) (Fischer, 1829).
Motte, Gregory ULg

Doctoral thesis (2011)

Introduction The purpose of this study is to verify one of the principal rules of ecology: the principle of exclusive competition, by using the sibling species of long-eared bats present in Belgium as a ... [more ▼]

Introduction The purpose of this study is to verify one of the principal rules of ecology: the principle of exclusive competition, by using the sibling species of long-eared bats present in Belgium as a model: the brown long-eared bat (Plecotus auritus) and the grey long-eared bat (Plecotus austriacus). Two similar species present in the same region and, what is more, share the same roost, must differ according to certain aspects of their ecological niche in order to be able to co-exist (MacNab 1971). In order to determine the resource sharing mechanisms between the two species, we have compared the three important dimensions of their ecological requirements: the use of trophic resources by means of faecal analysis and the use of space and time by radio-tracking. Trophic resources One hundred and thirty samples (4688 droppings, 6388 occurrences) taken from 5 single-species colonies of P. austriacus, 5 single-species colonies of P. auritus and from a mixed colony have been taken into account in the analysis of the summer diet. With the help of a first model constructed with the aid of generalized linear regressions, we have shown that, independently of the cohabitation conditions (single-species and mixed colonies), the two species have similar dietary requirements. Qualitatively, the same types of prey are consumed : Lepidoptera, Diptera (Craneflies, Cyclorrhapha and others Diptera), Coleoptera, Arachnids and Dermaptera. Small quantitative differences of between 3% to 8%, were seen to exist : P. austriacus consumes slightly more Coleoptera and Lepidoptera and fewer Craneflies than P. auritus. With the help of a second model enabling interspecific comparison of the diet according to whether the animal belonged to the single-species colonies or the mixed colony, we were able to show that the differences were more marked. When P. austriacus belong to single-species colonies, with reference to single-species colonies of P. auritus, predicted value indicate that they consume more Coleoptera (+ 5,0 %, p = 0,001) Lepidoptera (+ 14,4 %, p < 0,0005) and fewer Arachnids (- 8,3 %, p < 0,0005), Dermaptera (- 8,8%, p < 0,0005) and Craneflies (- 9,5 %, p = 0,009). This leads us to believe that the proportion of non-flying or diurnal prey gleaned by P. auritus is 2,5 times greater than that of P. austriacus. On the other hand, when P. austriacus belongs to the mixed colony, in reference to the P. austriacus single-species colonies, it changed its feeding behaviour. The predicted consumption of Arachnids and Dermaptera is higher, 14,5 % (p < 0,0005) and 11,3 % (p < 0,0005) respectively, while the consumption of Lepidoptera is much less (- 25,6 %, p < 0,0005). The syntopic P. austriacus also consume more craneflies (+ 7,9 %, p = 0,034) but fewer Coleoptera (-11,1 %, p = 0,009). This shows that P. austriacus posesses surprising adaptation abilities. The diet of the P. auritus of the mixed colony in relation to the single-species P. auritus, only showed slight variations on the other hand : - 7% (p = 0,006) for the Cyclorrhapha and - 4% (p = 0,002) for the Dermaptera. In syntopy, the study of seasonal variations has shown that the quantitative differences were significant at the end of gestation and lactation when the energy requirement is at its highest. In June, P. austriacus consumes more Arachnids (p = 0,046), in July, more Arachnids (p = 0,020) and fewer Lepidoptera (p = 0,020). In August, they consume more Dermaptera (p = 0.019), fewer Coleoptera (p = 0.032) and Lepidoptera (p = 0.034). Winter trophic ecology Our study has also led to the discovery of a little-known aspect of the ecology of chiroptera: winter trophic ecology. The results have shown that long-eared bats consume at least 70% of their prey which they capture by gleaning (Spiders, Dermaptera, Cyclorrhapha). These results have made it possible to confirm that the two species possess the ability to glean their prey. Spatial and temporal resources Twenty-two Plecotus were used for the analysis : seven P. auritus in Gozin, six P. austriacus in Gembes, five P. auritus and four P. austriacus in Pondrome (mixed colony). Eighty-four nights of monitoring corresponding to the discovery of 111 hunting grounds were used for the analyses. The results show that the use of space by P. auritus and P. austriacus contain similarities. The distance of the hunting grounds, the number of grounds visited per night, the duration of their use, their surface and the individual area of daily activity are similar. In the same way, contrary to what the literature suggests, it seems that P. auritus possesses the ability to exploit the open or semi-open areas like the meadows surrounded by linear woodland elements, while P. austriacus possesses the ability to exploit equally well the closed areas such as woods. In syntopy, the two species showed a different selection of habitats (grasslands, leafy woods,, gardens, edges for P. auritus and leafy or coniferous woods, gardens and edges for P. austriacus), P. auritus spending 64% of hunting time above the grassland against 83% in the woods for P. austriacus. On the other hand, in comparison with the two single-species colonies, the division of hunting time around the roost is more spread out in terms of space and the number of hunting grounds visited by night is more important. No difference in the exploitation of temporal resources was detected; the later departures from the Gozin colony were attributed to the presence of artificial lighting placed in front of the roost. The mechanisms allowing resources partitioning In the case of single-species colonies we have shown the existence of trophic resources partitioning. In fact, P. austriacus showed a diet less rich in Arachnids, Dermaptera, Craneflies and richer in Coeloptera and Lepidoptera than P. auritus. However, in syntopy, P. austriacus clearly modified its diet by consuming more Arachnids and Dermaptera to the detriment of Coleoptera and Lepidoptera. The consumption in Arachnids and Dermaptera remains higher than those of single-species P. auritus. Whether for single-species colonies or mixed colonies, trophic resources partitioning is quite evident. As requirements in terms of syntopy were modified, the results lead us to assume that inter-specific competition exists between this sibling species. The differences observed in the diet are probably dictated by a different use of the habitats. Indeed, in relation with the ecology of prey, the results of habitats use have made it possible to show that habitat partitioning occurs between the two species of long-eared bat. Our results therefore constitute a good illustration of the principle of competitive exclusion. Whether in the case of single-species colonies or mixed colonies, the two species share the trophic and spatial resources which allow them to co-exist. Recommendations for the conservation of the species To satisfy the requirements of the summer diet, it is necessary to maintain a network of diverse habitats composed of gardens, meadowlands, humid zones, hedges, bushes, tree alignments, leafy or mixed woodlands, preferably hygrophilous, allowing for the development of undergrowth and clearings. The results of the selection of surface habitats have globally confirmed the importance of these habitats used as hunting grounds. The selection of linear habitats such as tree-lines, hedges, bushes and edges also show the importance of ecological networks and the potentially damaging effects of the fragmentation of habitats on the bat population. In order to integrate the spatial requirements of P. austriacus, we recommend the establishment of a minimum protection perimeter of 3500 metres around the nest. With regard to P. auritus, it would be judicious to protect a minimum perimeter of a radius of 2000 metres. [less ▲]

Detailed reference viewed: 68 (10 ULg)
Full Text
See detailEtude comparée des parades sexuelles de quelques espèces de chéloniens: Pelomedusa s. subrufa (Lacépède), Sternotherus minor (Agassiz) et Kinixys belliana nogueyi (Bell)
Bels, Vincent; Libois, Roland ULg

in Cahiers d'Ethologie (1983), 3(1), 39-58

Next to a short analysis of the sexual interactions and the relative importance of the stimulation kinds performed with each behaviour pattern, we analyse the observed behavioural sequences in courtship ... [more ▼]

Next to a short analysis of the sexual interactions and the relative importance of the stimulation kinds performed with each behaviour pattern, we analyse the observed behavioural sequences in courtship and mating behaviour of three chelonian's species: Pelomedusa s. subrufa, Sternotherus minor and Kinixys belliana nogueyi. The study of the behavioural sequences emphasizes the great fluctiation between the exhibited behaviour patterns and specifies the means leading to the female's stabilization. The sexual behaviours (knowed from this study or the litterature) of P.s.subrufa, S. minor, K. belliana nogueyi, Geochelone carbonaria, Testudo g. graeca, Emys orbicularis, Chrysemys scripta elegans, Chemmys nigricans and Meosemys grandis were submitted to a discriminant analysis to establish certain phylogenetic relations by use of behavioural criteria. We emphasize here the difficulties of the interpretation of this lethod. However, we establish a relative ratification of the phylogeny founded on morphological characters. [less ▲]

Detailed reference viewed: 23 (1 ULg)
Full Text
See detailEtude comparée du comportement de cour de Triturus alpestris alpestris (Laurenti, 1768) et Triturus alpestris cyreni (Wolterstorff, 1932) : approche évolutive
Denoël, Mathieu ULg

Master's dissertation (1996)

The species concept in the animal world is very abstract. With diverse methods scientists try to place boundaries between species. But this is generally theoretical. Indeed species are in continuous ... [more ▼]

The species concept in the animal world is very abstract. With diverse methods scientists try to place boundaries between species. But this is generally theoretical. Indeed species are in continuous evolution, located more regularly between two evolutionary categories than inside a well-defined one. In this study we are interested by the courtship of two allopatric subspecies of the Alpine newt, Triturus alpestris alpestris and T. a. cyreni. We investigate the behaviour of two closely related taxa, in experimental conditions, to display the basis of behaviour evolution and isolating mechanisms prominently. We have identified 24 behaviours in the male display and principally 3 in the female (negative, static, positive). Sexual encounter will be divided in four stages: orientation during which animals are meeting, fan and lean-in exhibition phases during which the male displays and the spermatophore transfer sequence where the male deposits a spermatophore and displays also. The qualitative differences between subspecies are weak and concern principally amplitude of movements. From a qualitative level some differences were underlined. So T. a. alpestris touches the female with its snout frequently, whereas T. a. cyreni whips more often. The two subspecies do not use the same tactic with a non-responsive female. Indeed the T. a. alpestris male can easily enter in spermatophore transfer phase without the positive response of female. In order to attract the latter, he executes worm-like movements: in this way he lures a negative female. On the contrary, T. a. cyreni rarely deposits a spermatophore when the female is not receptive. It therefore makes very little use of the lure system. The analysis of male behaviours in relation with female response have allowed us to establish a model which assumes that some behaviours are exhibited by the male only when its motivation and that of the female go beyond a particular level. Some stereotyped behaviours (e.g. distal fan) concern movements whose amplitude is variable. We think that this movement modulation could be the foundation of a behaviour evolution and isolating mechanism. The female is indeed sensitive to these variations: in this way communication is possible between transmitter and receiver. The new variants problem is thus resolved. The fanning frequencies vary with temperature. They are weak at low temperatures. We consider this modulation as an adaptation to extreme and unpredictable habitats, e.g. in high altitude lakes and temporary ponds. The observed behavioural differences are in a lower level than between separate species, like T. helveticus and T. vulgaris. Moreover sperm transfer is likely between the two taxa. In conclusion the present data confirm the existence of two distinct subspecies T. a. alpestris and T. a. cyreni as detected by previous authors using allozyme and osteological analysis. [less ▲]

Detailed reference viewed: 27 (5 ULg)