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See detailDo Spermathecal Morphology And Inter-Mating Interval Influence Paternity In The Polyandrous Beetle Tribolium Castaneum?
Bernasconi, Giorgina; Brostaux, Yves ULg; Meyer, Eric P. et al

in Behaviour (2006), 143(5), 643-658

In polyandrous insects, postcopulatory sexual selection is a pervasive evolutionary force favouring male and female traits that allow control of offspring paternity. Males may influence paternity through ... [more ▼]

In polyandrous insects, postcopulatory sexual selection is a pervasive evolutionary force favouring male and female traits that allow control of offspring paternity. Males may influence paternity through adaptations for sperm competition, and females through adaptations facilitating cryptic female choice. Yet, the mechanisms are often complex, involving behaviour, physiology or morphology, and they are difficult to identify. In red flour beetles (Tribolium castaneum), paternity varies widely, and evidence suggests that both male and female traits influence the outcome of sperm competition. To test the role of spermathecal morphology and of sperm storage processes on the outcome of sperm competition, we mated each of 26 virgin females with two males, one of which carrying a phenotypic marker to assign offspring paternity. We manipulated the interval between mating with the first and the second male, to create different conditions of sperm storage (overlapping and non-overlapping) in the female reproductive tract. To investigate the role of sperm storage more closely, we examined the relationship between paternity and spermathecal morphology in a subset of 14 experimental females. In addition, we also characterized variation in spermathecal morphology in three different strains, wildtype, Chicago black and Reindeer. No significant influence of the intermating interval was found on the paternity of the focal male, although the direction of the difference was in the expected direction of higher last male paternity for longer intervals. Moreover, paternity was not significantly associated with spermathecal morphology, although spermathecal volume, complexity, and tubule width varied significantly and substantially among individuals in all investigated strains. [less ▲]

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See detailFrasnian
Coen-Aubert, M.; Boulvain, Frédéric ULg

in Geologica Belgica (2006), 9(1-2), 19-25

The name Frasnian, which comes from the locality of Frasnes near Couvin in Belgium, was introduced by Gosselet in 1879 and was formally retained for the lower stage of the Upper Devonian by the ... [more ▼]

The name Frasnian, which comes from the locality of Frasnes near Couvin in Belgium, was introduced by Gosselet in 1879 and was formally retained for the lower stage of the Upper Devonian by the Subcommission on Devonian Stratigraphy in 1981. The modern definition of the Frasnian is based on conodonts and the historical background of the stage is developed in detail herein. Data about the lithostratigraphy, sedimentology, biostratigraphy, chronostratigraphy and absolute age of the Frasnian can also been found in this contribution. [less ▲]

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See detailDisused Jurassic regional stage from Belgium: Virtonian
Delsate, D.; Boulvain, Frédéric ULg

in Geologica Belgica (2006), 9(1-2), 199-200

An overview of the definition and history of the Virtonian is given with the argumentation for the abandonment of this disused regional stage.

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See detailSpatio-temporal relationships in a primitive space: an attempt to simplify spatio-temporal analysis
Hallot, Pierre ULg

in Raubal, Martin; Miller, Harvey; Frank, Andrew (Eds.) et al Fourth International Conference, GIScience 2006 (2006)

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See detailNutritive value of tropical tree leaf meals in adult sows.
Leterme, Pascal; Botero, M.; Londono, A. M. et al

in Animal Science (2006), 82

Tree leaf meals (TLM) are increasingly used in the tropics to feed pigs. The nutritive value of the TLM of cocoyam (Xanthosoma saggitifolium), mulberry (Morus alba) and Trichanthera gigantea, their effect ... [more ▼]

Tree leaf meals (TLM) are increasingly used in the tropics to feed pigs. The nutritive value of the TLM of cocoyam (Xanthosoma saggitifolium), mulberry (Morus alba) and Trichanthera gigantea, their effect on the digestive tract and their fermentation rate in the large intestine, were determined in adult sows given diets containing 150 or 300 g TLM per kg. The TLM contained from 8·5 to 12·0 MJ digestible energy per kg dry matter (DM) and from 60 to 125 g digestible protein per kg DM. The digestibility was not affected ( P>0·05) by their rate of incorporation in the diet. The apparent ileal protein digestibility of the diets containing 300 g TLM per kg was also determined by the slaughtering method. It reached 80% for the basal diet and 54, 70 and 74% for the Trichanthera-, mulberry- and cocoyam-based diets, respectively. No diet effect ( P>0·05) was observed on the weight and length of the gastro-intestinal tract, with the exception of a heavier caecum in sows given the Trichanthera-based diet ( P<0·01). The pH of the gastric fluid of these sows was also higher ( P<0·001). The fermentation of the dietary fibre in the large intestine was evaluated by the gas technique using syringes. The cocoyam leaves presented the highest amount of total gas produced after fibre fermentation ( P<0·001). The ranking order of gas production was identical to that observed for the digestibility coefficients: Trichanthera <mulberry <cocoyam. In conclusion, TLM can represent up to 0·3 of a diet for sows. Their use in sow nutrition may be considered in tropical regions where protein sources are scarce. [less ▲]

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See detailAnalisis de la variabilidad molecular de una coleccion peruana de Smallanthus sonchofolius (Poepp & Endl) H. Robinson
Roberto, C.; Mansillas, S.; Lopez, C. B. et al

in Ecologia Aplicada (2006), 5(1,2), 75-80

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See detailBiodiversity of cucurbits consumed as sauce thickener in Ivory Coast : a capital resource for the economic prosperity of rural women
Zoro Bi, I.; Koffi, K. K.; Dje, Y. et al

in Tropical Biodiversity : Science, Date, Conservation (2006)

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See detailIndigenous cucurbits of Côte d'Ivoire : a review of their genetic resources
Zoro Bi, I.; Koffi, K. K.; Dje, Y. et al

in Science et Nature (2006), 3(1), 1-9

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See detailInduccion floral de Arracacha
Blas, S. R.; Julca-Otiniano, A.; Baudoin, Jean-Pierre ULg

in IDESIA (2006), 24(1), 1-7

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See detailEfecto del derivado de la lactosa sobre la población microbiana de muestras fecales de cerdos posdestete.
Rosero, Olga Lucia; Leterme, Pascal; Bindelle, Jérôme ULg et al

in Acta Agronomica (2006), 55

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See detailThe platelet ATP and ADP receptors.
Oury, Cécile ULg; Toth-Zsamboki, Emese; Vermylen, Jos et al

in Current Pharmaceutical Design (2006)

This review focuses on recent findings on the physiology of these platelet ADP and ATP receptors, their distinct downstream intracellular signaling pathways as well as on the available agonists ... [more ▼]

This review focuses on recent findings on the physiology of these platelet ADP and ATP receptors, their distinct downstream intracellular signaling pathways as well as on the available agonists, antagonists and inhibitors that allow their pharmacological discrimination. [less ▲]

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See detailLa problématique chablis, s'y préparer et gérer la crise ! (1ère partie)
Collin, Jean-François; Jourez, Benoît ULg; Hebert, Jacques ULg

in Forêt Wallonne (2006), (80), 3-12

L’objectif de la présente réflexion est de répondre à quelques questions clés face auxquelles la filière bois se trouve confrontée lors d’événements venteux occasionnant des chablis de grande ampleur. Que ... [more ▼]

L’objectif de la présente réflexion est de répondre à quelques questions clés face auxquelles la filière bois se trouve confrontée lors d’événements venteux occasionnant des chablis de grande ampleur. Que faire ? Comment diminuer les risques ? Comment limiter les pertes ? Ces questions servent de fil conducteur à un projet de recherche mené actuellement en Région wallonne. Ce projet ainsi que quelques éléments de réponse quant à la limitation des risques sont présentés ci-après. [less ▲]

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See detailLa problématique chablis, s'y préparer et gérer la crise ! (2ème partie)
Collin, Jean-François; Jourez, Benoît ULg; Hebert, Jacques ULg

in Forêt Wallonne (2006), (80), 13-26

Que faire, quand, suite à une tempête, la filière bois se trouve face à une forêt dévastée et une quantité de bois importante et imprévue sur le marché ? Le projet mené actuellement en Région wallonne et ... [more ▼]

Que faire, quand, suite à une tempête, la filière bois se trouve face à une forêt dévastée et une quantité de bois importante et imprévue sur le marché ? Le projet mené actuellement en Région wallonne et dont il a déjà été question dans la première partie de ce sujet, a précisément pour objectif d’aider les acteurs de la filière à prendre les meilleures décisions afin de limiter leurs pertes respectives. Quelques éléments de réponse quant à la limitation des risques ayant déjà été présentés précédemment, nous aborderons dans cette partie les différentes actions à mettre en oeuvre afin de gérer au mieux la crise liée aux chablis. [less ▲]

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See detailUn modèle de document simple de gestion (DSG) applicable en propriété forestière privée wallonne
Jandrain, S.; Puissant, T.; Colson, Vincent ULg et al

Book (2006)

Most of the private forest owners don’t use a management plan especially in the case of woodlands scaterred in small compartments. Furthermore they generally miss documents compiling updated descriptive ... [more ▼]

Most of the private forest owners don’t use a management plan especially in the case of woodlands scaterred in small compartments. Furthermore they generally miss documents compiling updated descriptive information dealing with administrative data, stand and structure composition, ownership location, planning and control of silvicultural operations. A similar situation is observed as concerns maps and cartographic elements. The main objective of this paper is to present a simple information system based upon data easy to collect and suitable for a great number of forest properties whatever their sizes are. Informations from the forest are collected at the compartment’s level (planning unit defined by permanent boundaries) and are registered in a computerized data base so that any owner can make continuing use of information such as various repartitions (areas and species by age, by structure,..), digitized thematic maps (stand, soil, silvicultural operations,..). Such a system provided in option can be considered as a pragmatic decision support whose one of the main objectives is to assure the follow-up of compartments years after years. To support it, the setting up of a structure at a regional level should be very useful to the forest managers and also a way to better assist the private forest ownership in the frame of a regional forest policy taking attention to the general recommendations of sustainable management. [less ▲]

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See detailEtude de la variabilité et des liens génétique entre les populations Holsteins Luxembourgeoise et Tunisienne
Hammami, Hedi ULg

Master of advanced studies dissertation (2006)

L’analyse d’un pedigree combiné a permis d’étudier la variabilité et les liens génétiques entre les 2 populations luxembourgeoise et tunisienne. L’extraction et l’ajout de plusieurs ancêtres a permis une ... [more ▼]

L’analyse d’un pedigree combiné a permis d’étudier la variabilité et les liens génétiques entre les 2 populations luxembourgeoise et tunisienne. L’extraction et l’ajout de plusieurs ancêtres a permis une amélioration des profondeurs des 2 pedigrees. Cependant, la connaissance des pedigrees reste partielle pour les 2 populations malgré cette consolidation. L’intervalle de génération de la voie mère-fille reste similaire pour les 2 populations. Par contre, l’intervalle de génération père-fille était différent entre les 2 populations. En effet, il était plus élevé et de l’ordre de 9 ans pour le cas de la population Holstein tunisienne, mais il n’a pas dépassé les 7 ans chez la population luxembourgeoise. Les coefficients de consanguinité ont été estimés selon une approche modifiée de la méthode de Meuwissen et Luo (1992). Les niveaux de consanguinité enregistrés sont similaires à la majorité des valeurs et trends obtenus dans la plupart des études menées sur la Holstein dans le monde. Ces niveaux et pour le cas des 2 populations restent faibles jusqu’à la fin des années 1980, mais augmentent considérablement après les années 1990 d’une manière plus accentuée chez la population femelle tunisienne. Les 2 populations sont caractérisées par des nombres réduits de fondateurs efficaces et d’ancêtres efficaces. 8 parmis les 10 ancêtres ayant la contribution marginale la plus élevée à chacune des 2 populations femelles de référence restent identiques mais avec des contributions appropriées à chacune d’elles. Ces ancêtres ont contribué à plus de 32% au patrimoine génétique des 2 populations femelles de référence. La parenté moyenne entre les 2 populations femelles ainsi que celle estimée entre les taureaux utilisés par ces 2 populations entre 1990 et 2000 montre que ces dernières sont bien connectées. Ceci permettra une investigation des interactions génotype x environnement basée sur la similarité et la parenté génétique entre ces 2 populations. [less ▲]

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See detailTreatment of anaemia with erythropoietin
Beguin, Yves ULg; Dujardin, C.; Piron, Maude ULg et al

in Brugnara, C.; Beaumont, C. (Eds.) ESH Scientific Updates. Disorders of Iron Homeostasis, Erythrocytes and erythropoiesis (2006)

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See detailStress constrained optimization using X-FEM and Level-Set description
Van Miegroet, Laurent ULg; Jacobs, Thibault; Lemaire, Etienne ULg et al

in Proceedings of III European Conference on Computational Mechanics. Solids, Structures and Coupled Problems in Engineering (2006)

This paper presents and describes an intermediate approach which takes its place between the two classical methods of shape and topology optimization. It is based on using the recent Level Set description ... [more ▼]

This paper presents and describes an intermediate approach which takes its place between the two classical methods of shape and topology optimization. It is based on using the recent Level Set description of the geometry and the novel eXtended Finite Element Method (X-FEM). The method benefits from the fixed mesh work using X-FEM and from the curves smoothness of the Level Set description. Design variables are shape parameters of basic geometric features. The number of design variables of this formulation remains small whereas various global and local constraints can be considered. A key problem which is investigated here is the sensitivity analysis and the way it can be carried out precisely and efficiently. Numerical applications revisit some classical 2D (academic) benchmarks from shape optimization and illustrate the great interest of using X-FEM and Level Set description together. The paper presents the results of stress constrained problems using the proposed X-FEM and Level Set based formulation. A central issue is the sensitivity analysis (related to the compliance and/or the stresses) and the way it can be carried out efficiently. A special attention is also paid to stress constrained problems which are often neglected in other Level Set Methods works. [less ▲]

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See detailPip, a novel activator of phenazine biosynthesis in Pseudomonas chlororaphis PCL1391
Girard, Geneviève; Barends, S.; Rigali, Sébastien ULg et al

in Journal of Bacteriology (2006), 188(23), 8283-8293

Secondary metabolites are important factors for interactions between bacteria and other organisms. Pseudomonas chlororaphis PCL1391 produces the antifungal secondary metabolite phenazine-1-carboxamide ... [more ▼]

Secondary metabolites are important factors for interactions between bacteria and other organisms. Pseudomonas chlororaphis PCL1391 produces the antifungal secondary metabolite phenazine-1-carboxamide (PCN) that inhibits growth of Fusarium oxysporum f. sp. radius lycopersici the causative agent of tomato foot and root rot. Our previous work unraveled a cascade of genes regulating the PCN biosynthesis operon, phzABCDEFGH. Via a genetic screen, we identify in this study a novel TetR/AcrR regulator, named Pip (phenazine inducing protein), which is essential for PCN biosynthesis. A combination of a phenotypical characterization of a pip mutant, in trans complementation assays of various mutant strains, and electrophoretic mobility shift assays identified Pip as the fifth DNA-binding protein so far involved in regulation of PCN biosynthesis. In this regulatory pathway, Pip is positioned downstream of PsrA (Pseudomonas sigma factor regulator) and the stationary-phase sigma factor RpoS, while it is upstream of the quorum-sensing system PhzI/PhzR. These findings provide further evidence that the path leading to the expression of secondary metabolism gene clusters in Pseudomonas species is highly complex. [less ▲]

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