Publications ORBi OA
Bookmark and Share    
Full Text
See detailValerius Maximus, Facta et dicta memorabilia
Adam, Renaud ULg

in Delsaert, Pierre; Duvosquel, Jean-Marie; Simons, Ludo (Eds.) et al Honderd schatten uit de Koninklijke Bibliotheek van België (2005)

Detailed reference viewed: 17 (0 ULg)
Full Text
Peer Reviewed
See detailDendritic flux penetration in Pb films with a periodic array of antidots
Menghini, M.; Wijngaarden, R. J.; Silhanek, Alejandro ULg et al

in Physical Review. B : Condensed Matter (2005), 71(10),

We explore the flux-jump regime in type-II Pb thin films with a periodic array of antidots by means of magneto-optical measurements. A direct visualization of the magnetic flux distribution allows us to ... [more ▼]

We explore the flux-jump regime in type-II Pb thin films with a periodic array of antidots by means of magneto-optical measurements. A direct visualization of the magnetic flux distribution allows us to identify a rich morphology of flux penetration patterns. We determine the phase boundary H-*(T) between dendritic penetration at low temperatures and a smooth flux invasion at high temperatures and fields. For the whole range of fields and temperatures studied, guided vortex motion along the principal axes of the square pinning array is clearly observed. In particular, the branching process of the dendrite expansion is fully governed by the underlying pinning topology. A comparative study between macroscopic techniques and direct local visualization sheds light onto the puzzling T- and H-independent magnetic response observed at low temperatures and fields. Finally, we find that the distribution of avalanche sizes at low temperatures can be described by a power law with exponent tau similar to 0.9(1). [less ▲]

Detailed reference viewed: 8 (1 ULg)
Full Text
Peer Reviewed
See detailFirst report of cucurbit aphid-borne yellows virus in Tunisia causing yellows on five cucurbitacious species
Mnari Hattab, M.; Kummert, J.; Roussel, S. et al

in Plant Disease (2005), 89

Detailed reference viewed: 23 (0 ULg)
Full Text
Peer Reviewed
See detailCourtship behaviour at low and high water temperatures in the Alpine newt
Denoël, Mathieu ULg; Mathieu, Maryève; Poncin, Pascal ULg

Poster (2005)

Environmental factors are known to have a major effect on behavioral patterns of organisms. Among these factors, temperature particularly affects ectotherms. However, although many studies focused on ... [more ▼]

Environmental factors are known to have a major effect on behavioral patterns of organisms. Among these factors, temperature particularly affects ectotherms. However, although many studies focused on acoustic communication, the effect of environmental temperature on visual courtship displays and sexual performance has been little explored. The aim of this work was to determine the effect of temperature on the sexual behaviour of the Alpine newt Triturus alpestris in controlled laboratory conditions. Temperature had a major effect on the two sexes: at low temperatures, the frequencies of several displays, including sperm deposition, is lowered. This variation is in fact caused by the female responsiveness, which is temperature-dependent. However, some other behaviours, such as the fanning movement of the male’s tail (i.e., the main courtship display) are directly dependent on temperature: at lower temperatures, the tail beats at a lower rate but for a longer time. The similar reproductive success at the two temperatures indicates that breeding in cold water is not necessarily costly. It allows males and females to mate early in the season. This is particularly adaptive because, in many habitats, the reproductive period is shortened by drying or freezing conditions which may impair survival of branchiate offspring. [less ▲]

Detailed reference viewed: 41 (0 ULg)
Full Text
Peer Reviewed
See detailAre cannibalistic morphs of the tiger salamander obligatory cannibals?
Denoël, Mathieu ULg; Whiteman, Howard; Wissinger, Scott

Conference (2005)

Tiger salamanders exhibit alternative trophic morphologies, with cannibals developing a larger head and longer teeth than typical larvae. Resource partitioning is known between morphs, with cannibal ... [more ▼]

Tiger salamanders exhibit alternative trophic morphologies, with cannibals developing a larger head and longer teeth than typical larvae. Resource partitioning is known between morphs, with cannibal morphs usually foraging on conspecifics and rarely on small organisms. Our aim was to determine whether the cannibal and typical morphs shift their diets across time and particularly whether conspecifics are necessarily the main prey of cannibals and plankton the primary prey of typicals. We found that only the cannibal morph foraged on conspecifics, but not all the time. Cannibalism typically occurred only early after the ontogenetic divergence between morphs. Cannibals shifted their diet later in the summer to plankton, and this ontogenetic shift led to dietary overlap with the typical morph. In contrast to other studies, our findings suggest that the cannibal morphology actually allows the consumption of a larger variety of prey, rather than specialization on specific resources (i.e., conspecifics). The outcomes of the cannibalistic ontogenetic pathway include a higher biomass intake from food and a larger size than typicals. From a foraging perspective, the cannibalism pathway is clearly advantageous over the typical morphology. However, the increased diet breadth of cannibal morphs found in this study suggests that the maintenance of the polyphenism is more complex than has previously been suggested. [less ▲]

Detailed reference viewed: 40 (0 ULg)
Full Text
Peer Reviewed
See detailA propos des conceptions et théories actuelles de l'autisme
Gauthier, Jean-Marie ULg

in Autisme et langage (Langage et pratiques) (2005), 36

Detailed reference viewed: 125 (22 ULg)
Full Text
See detailLogica vetus
Adam, Renaud ULg

in de Vos, Wim; Cahen-Delhaye, Anne (Eds.) België : de tien instellingen van het Federaal Wetenschapsbeleid (2005)

Detailed reference viewed: 2 (0 ULg)
Full Text
Peer Reviewed
See detailCrystal structure of the Actinomadura R39 DD-peptidase reveals new domains in penicillin-binding proteins.
Sauvage, Eric ULg; Herman, Raphaël ULg; Petrella, Stephanie et al

in Journal of Biological Chemistry (2005), 280(35), 31249-56

Actinomadura sp. R39 produces an exocellular DD-peptidase/penicillin-binding protein (PBP) whose primary structure is similar to that of Escherichia coli PBP4. It is characterized by a high beta-lactam ... [more ▼]

Actinomadura sp. R39 produces an exocellular DD-peptidase/penicillin-binding protein (PBP) whose primary structure is similar to that of Escherichia coli PBP4. It is characterized by a high beta-lactam-binding activity (second order rate constant for the acylation of the active site serine by benzylpenicillin: k2/K = 300 mm(-1) s(-1)). The crystal structure of the DD-peptidase from Actinomadura R39 was solved at a resolution of 1.8 angstroms by single anomalous dispersion at the cobalt resonance wavelength. The structure is composed of three domains: a penicillin-binding domain similar to the penicillin-binding domain of E. coli PBP5 and two domains of unknown function. In most multimodular PBPs, additional domains are generally located at the C or N termini of the penicillin-binding domain. In R39, the other two domains are inserted in the penicillin-binding domain, between the SXXK and SXN motifs, in a manner similar to "Matryoshka dolls." One of these domains is composed of a five-stranded beta-sheet with two helices on one side, and the other domain is a double three-stranded beta-sheet inserted in the previous domain. Additionally, the 2.4-angstroms structure of the acyl-enzyme complex of R39 with nitrocefin reveals the absence of active site conformational change upon binding the beta-lactams. [less ▲]

Detailed reference viewed: 60 (15 ULg)
Full Text
Peer Reviewed
See detailCrystal structure of BRL 42715, C6-(N1-methyl-1,2,3-triazolylmethylene)penem, in complex with Enterobacter cloacae 908R beta-lactamase: evidence for a stereoselective mechanism from docking studies.
Michaux, Catherine; Charlier, Paulette ULg; Frère, Jean-Marie ULg et al

in Journal of the American Chemical Society (2005), 127(10), 3262-3

BRL 42715, C6-(N1-methyl-1,2,3-triazolylmethylene)penem, is an active-site-directed inactivator of bacterial beta-lactamases. The crystal structure of Enterobacter cloacae 908R class C beta-lactamase in ... [more ▼]

BRL 42715, C6-(N1-methyl-1,2,3-triazolylmethylene)penem, is an active-site-directed inactivator of bacterial beta-lactamases. The crystal structure of Enterobacter cloacae 908R class C beta-lactamase in complex with BRL 42715, docking, and energy minimization studies explain stereoselectivity of the binding of C6-(heterocyclic methylene)penems against class C beta-lactamase. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailVetus Logica
Adam, Renaud ULg

in de Vos, Wim; Cahen-Delhaye, Anne (Eds.) Belgique : les dix établissements de la Politique scientifique fédér (2005)

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailProteomic approach to investigate plant – aphid interactions
Francis, Frédéric ULg; Gerkens, Pascal; De Pauw, Edwin ULg et al

Conference (2005)

Detailed reference viewed: 13 (5 ULg)
Full Text
Peer Reviewed
See detailOptimality of feeding on land versus in water in juvenile Alpine newts (Triturus alpestris veluchiensis)
Denoël, Mathieu ULg

Poster (2005)

Most newts experience both terrestrial and aquatic environments during their adult life. A large number of studies explored the feeding habits in the aquatic habitat while very few focused on the ... [more ▼]

Most newts experience both terrestrial and aquatic environments during their adult life. A large number of studies explored the feeding habits in the aquatic habitat while very few focused on the terrestrial component and none compared the two systems within a single population. The aim of this study was to find out which foraging tactic is the most successful in terms of energy intake. To this end, I analysed the feeding habits of metamorphosed juveniles in the Alpine newt inhabiting a Greek alpine lake and its surrounding lands. The diet reflected the range of prey available in the two habitats, but invertebrates, which fell on the water surface, were also ingested by aquatic newts. These two lifestyles had different energy outcomes because the highest number of terrestrial invertebrates taken in the terrestrial habitat than in the aquatic one provided higher energy gains to terrestrial juveniles. However, different mortality rates between habitats (highest probability of freezing risk on high-elevated lands than in deep waters) and an expected lower energy intake on land when air temperature is low could explain the persistence of the aquatic foraging tactic in the population. [less ▲]

Detailed reference viewed: 23 (1 ULg)
Full Text
Peer Reviewed
See detailConsequences of fish introductions on paedomorphic newts (Triturus alpestris and T. helveticus)
Denoël, Mathieu ULg; Dzukic, Georg; Kalezic, Milos

Poster (2005)

Fish stocking is largely recognized as a major thread to amphibian populations. Although it acts at a local level, it is widespread at a world scale. Despite this good knowledge, the effect of fish on ... [more ▼]

Fish stocking is largely recognized as a major thread to amphibian populations. Although it acts at a local level, it is widespread at a world scale. Despite this good knowledge, the effect of fish on alternative phenotypes has only been described in a few local studies. Our aim was to report on the loss of intraspecific heterochrony as a loss to diversity in determining the consequences of fish introductions on paedomorphs (morphs retaining gills at the adult stage) of two European species of newts. We surveyed almost all the main known paedomorphic populations of the Alpine (Triturus alpestris) and palmate (T. helveticus) newts, which all but one initially occupied fishless ponds and lakes in France, Italy, Slovenia, Bosnia, Montenegro, and Greece. Exotic fish were found in almost half of the studied aquatic habitats. Introductions involved several ornamental and large predatory species of fish. At all sites, in which fish were introduced, paedomorphs disappeared and metamorphs declined. The largest known populations of newts, including some endemic subspecies, were concerned. If measures are not taken to stop fish stocking, protect paedomorphs as conservation units, and restore natural habitats, all the largest paedomorphic populations may disappear in the near future. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
Peer Reviewed
See detailUbiquitous and kidney-specific subunits of vacuolar H+-ATPase are differentially expressed during nephrogenesis.
JOURET, François ULg; Auzanneau, Celine; Debaix, Huguette et al

in Journal of the American Society of Nephrology (2005), 16(11), 3235-46

The vacuolar H(+)-ATPase (V-ATPase) is a ubiquitous multisubunit pump that is responsible for acidification of intracellular organelles. In the kidney, a particular form of V-ATPase, made of specific ... [more ▼]

The vacuolar H(+)-ATPase (V-ATPase) is a ubiquitous multisubunit pump that is responsible for acidification of intracellular organelles. In the kidney, a particular form of V-ATPase, made of specific subunits isoforms, has been located at the plasma membrane of intercalated cells (IC). Mutations in genes encoding IC-specific subunits cause infant distal renal tubular acidosis (dRTA), suggesting that the segmental distribution of these subunits is acquired at birth or during early infancy. However, the comparative ontogeny of the IC-specific versus the ubiquitous subunits of V-ATPase and the mechanisms involved in their segmental expression remain unknown. Real-time reverse transcription-PCR, in situ hybridization, immunoblotting, immunostaining, and subcellular fractionation analyses characterized the expression and distribution of V-ATPase subunits, transcription factors, and differentiation markers during mouse nephrogenesis. Ubiquitous A, E1, B2, G1, and C1 subunits showed an early (embryonic day 13.5 [E13.5]) and stable expression throughout nephrogenesis, followed by a slight increase around birth. The developmental pattern of a1 was bimodal, with early induction, gradual decrease during organogenesis, and neonatal increase. These patterns contrasted with the later (from E15.5) and progressive expression of IC-specific a4, B1, G3, and C2 subunits, after the induction of the forkhead transcription factor Foxi1. From E15.5, Foxi1 mRNA was detected in IC, where it co-distributed with B1 in late nephrogenesis. Immunostaining showed that the distribution of ubiquitous E1 and B2 was acquired from E15.5, whereas a4 was located in IC during late nephrogenesis. Subcellular fractionation showed that in both fetal and mature (cortex and medulla) kidneys, E1 and a4 were located in endosomes. These data demonstrate a differential expression and a coordinate regulation of IC-specific versus ubiquitous V-ATPase subunits during nephrogenesis. They provide new insights into the complex regulation of V-ATPase subunits, the maturation of IC along the nephron, and the pathophysiology of hereditary dRTA. [less ▲]

Detailed reference viewed: 28 (8 ULg)
Full Text
See detailUne Vierge guerrière au service des Habsbourg et de l’Église catholique
Delfosse, Annick ULg

in Bethouart, Bruno; Lottin, Alain (Eds.) La dévotion mariale de l’an Mil à nos jours (2005)

First study about a little known Marian function: the Virgin as a powerful and armed warrior, supporting the catholic troops.

Detailed reference viewed: 148 (14 ULg)
Full Text
See detailA model for the generalized parton distribution of the pion
Stassart, Pierre ULg; Bissey, F.; Cudell, Jean-René ULg et al

in AIP Conference Proceedings (2005), 756

Detailed reference viewed: 13 (3 ULg)
Full Text
Peer Reviewed
See detailModulation of homing properties of primitive progenitor cells generated by ex vivo expansion.
Foguenne, Jacques ULg; Huygen, Sandra; Greimers, Roland ULg et al

in Haematologica (2005), 90(4), 445-51

BACKGROUND AND OBJECTIVES: The maintenance of adequate interactions with the bone marrow (BM) microenvironment is critical to ensure efficient homing of ex vivo-expanded hematopoietic cells. This study ... [more ▼]

BACKGROUND AND OBJECTIVES: The maintenance of adequate interactions with the bone marrow (BM) microenvironment is critical to ensure efficient homing of ex vivo-expanded hematopoietic cells. This study was intended to assess adhesion and migration properties of long-term culture-initiating cells (LTC-IC) harvested after self-renewal division in ex vivo culture and to determine their susceptibility to growth-inhibitory signals mediated by adhesion to BM stromal ligands. DESIGN AND METHODS: We used cell tracking to isolate primitive LTC-IC that had accomplished 1 or 2 divisions ex vivo. Adhesion, migration and growth inhibition of divided LTC-IC were determined in the presence of purified BM ligands, and compared to the properties of uncultured LTC-IC. RESULTS: As compared to undivided LTC-IC, adhesion and migration mediated by very late antigen (VLA)-4 integrin across both vascular cell adhesion molecule-1 (VCAM-1) and fibronectin (Fn) were downregulated in post-mitotic LTC-IC. Conversely, binding and motility via VLA-5 across Fn were stimulated. No changes occurred in LTC-IC interactions with intercellular adhesion molecule-1 (ICAM-1) or with E- or P-selectin. Proliferation of uncultured LTC-IC was inhibited by VLA-4-mediated binding to VCAM-1 and the CS-1 domain of Fn, as well as binding to P-selectin. Growth of ex vivo-generated LTC-IC became unresponsive to these 3 ligands but was suppressed through VLA-5 engagement by the cell binding domain of Fn. INTERPRETATION AND CONCLUSIONS: The generation of LTC-IC in expansion culture is associated with functional alterations of adhesion receptors, modulating not only binding and migration in the BM but also responsiveness to adhesion-mediated growth inhibitory signals. Such changes may limit homing and engraftment of expanded primitive stem/progenitor cells. [less ▲]

Detailed reference viewed: 28 (5 ULg)
Full Text
See detailLe nouveau droit international privé belge
Wautelet, Patrick ULg

in Euredia : Revue de Droit Bancaire et Financier (2005)

In this paper, I offer an overview of the provisions of the Code of Private International Law (Act of 16 July 2004) relevant for the banking and financial practice. The overview starts with the general ... [more ▼]

In this paper, I offer an overview of the provisions of the Code of Private International Law (Act of 16 July 2004) relevant for the banking and financial practice. The overview starts with the general provisions of the Code, applicable to all operations and then focuses on selected questions such as securities, corporations, insolvencies and trusts. [less ▲]

Detailed reference viewed: 125 (2 ULg)
Full Text
See detailLes composantes et les étapes d'un processus de formation I. Partie théorique
Vandoorne, Chantal ULg; Pierrard, H.

Learning material (2005)

Detailed reference viewed: 17 (0 ULg)