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See detailAn Ant Colony System for Responsive Dynamic Vehicle Routing
Schyns, Michael ULg

in European Journal of Operational Research (2015), 245(3), 704-718

We present an algorithm based on an Ant Colony System to deal with a broad range of Dynamic Capacitated Vehicle Routing Problems with Time Windows, (partial) Split Delivery and Heterogeneous fleets ... [more ▼]

We present an algorithm based on an Ant Colony System to deal with a broad range of Dynamic Capacitated Vehicle Routing Problems with Time Windows, (partial) Split Delivery and Heterogeneous fleets (DVRPTWSD). Besides the traditional distance criterion, we address the important case of responsiveness. Responsiveness is defined here as completing a delivery as soon as possible, within the time window, such that the client or the truck may restart its activities. This is crucial for many production or service activities in different fields: express parcel deliveries, taxi services, Just in Time production, express repair services, medical care, petrol station replenishment, etc. We develop an interactive web-based solution to allow dispatchers to take new information into account in real-time. The algorithm and its parametrization were tested on real and artificial instances. We first illustrate our approach with a problem submitted by Liege Airport, the 8th biggest cargo airport in Europe. The goal is to develop a decision system to optimize the journey of the refueling trucks. We then consider some classical VRP benchmarks with extensions for more complex problems. [less ▲]

Detailed reference viewed: 214 (30 ULg)
See detail"Ant'Phipoda", the reference centre for Antarctic crustaceans: A tool for developing and managing Antarctic marine biodiversity information
De Broyer, Claude; Duchesne, Paul-André; Vander Linden, Charles et al

in Polish Archives for Hydrobiology (2000), 47

Detailed reference viewed: 21 (2 ULg)
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See detailAnt-aphid mutualism - A question of microorganisms?
Fischer, Christophe ULg; Patris, Geoffrey; Duriaux, Adrien ULg et al

Poster (2011, September)

It is now long known that some ant and aphid species can present a mutualistic relationship, ants using aphid honeydew as sugar source and in exchange providing the aphid colony cleaning and protection ... [more ▼]

It is now long known that some ant and aphid species can present a mutualistic relationship, ants using aphid honeydew as sugar source and in exchange providing the aphid colony cleaning and protection. From a behavioral point of view, this phenomenon has been well studied, but its chemistry and semiochemical mechanisms are still largely unknown. This study aims to identify semiochemicals involved in the establishment of this relation and their sources, using both chemical and behavioral methods. Bioassays revealed that the greatest part of ant attraction toward aphid colonies is due to honeydew volatile compounds; enabling ant scouts to find more quickly aphid colonies and distantly recognize myrmecophilous species. Many of those VOCs seeming to have microbial origins, the main honeydew microorganisms have been isolated and their roles in VOCs production and ant attraction have been investigated. [less ▲]

Detailed reference viewed: 98 (26 ULg)
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See detailAnt-aphid mutualism - How do ants locate aphid colonies?
Fischer, Christophe ULg; Sablon, Ludovic ULg; Duriaux, Adrien ULg et al

Poster (2011, June)

That some ant species show mutualistic relationships with some aphid species is well known since several decades. Ants protect aphids against natural enemies and as a reward collect the sugar-rich aphid ... [more ▼]

That some ant species show mutualistic relationships with some aphid species is well known since several decades. Ants protect aphids against natural enemies and as a reward collect the sugar-rich aphid excretion called honeydew. However, very little information is available on possible semiochemicals involved in these interactions. This study aims to identify semiochemicals involved in the establishment of this relation, using both chemical and behavioral approaches. Preliminary choice tests confirmed that ant scouts are able to detect aphid colonies at a distance using volatile organic compounds (VOC). Those VOC influencing ant’s orientation may originate from different sources: the attacked plant, the honeydew produced by the aphids and the aphids themselves. VOC emission profiles of each of those potential sources have been established using gas chromatography. Y-olfactometer assay revealed that honeydew volatile compounds are the key element in this distant attraction. Moreover, based on these VOCs, ant scouts are able to discriminate between the honeydew produced by a myrmecophilous and a non myrmecophilous aphid species. Thus, more than just a sugar source, honeydew is an attractant for ant scouts towards myrmecophilous aphids. [less ▲]

Detailed reference viewed: 145 (12 ULg)
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See detailAnt-aphid mutualism - Implication of honeydew microflora
Fischer, Christophe ULg; Piraux, Olivier; Lognay, Georges ULg et al

Conference (2012, July)

Some ant and aphid species can present a mutualistic relationship, ants using aphid honeydew as sugar source and in exchange providing the aphid colony cleaning and protection. From a behavioral point of ... [more ▼]

Some ant and aphid species can present a mutualistic relationship, ants using aphid honeydew as sugar source and in exchange providing the aphid colony cleaning and protection. From a behavioral point of view, this phenomenon has been well studied from decades. However, its chemistry and semiochemical mechanisms are still largely unknown. This study aims to identify semiochemicals involved in the establishment of this relation, using both chemical and behavioral approaches. Bioassays revealed that the greatest part of ant attraction toward aphid colonies is due to honeydew volatile compounds; enabling ant scouts to find more quickly aphid colonies and distantly recognize myrmecophilous species. Many of those VOCs seeming to have microbial origins, the main honeydew microorganisms have been isolated and their roles in VOCs production and ant attraction have been investigated. It appeared that honeydew microflora holds a key role in the establishment of ant-aphids mutualistic relationship. [less ▲]

Detailed reference viewed: 99 (17 ULg)
Peer Reviewed
See detailAntagonistes calciques et calcithérapie : incompatibilité ?
Mottard, L; Lecart, MP; Reginster, Jean-Yves ULg

in Actualité Médicale Belge (1992), 335

Detailed reference viewed: 13 (1 ULg)
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See detailLes antagonistes calciques ont-ils une place de première ligne dans le traitement de l'hypertension artérielle?
Krzesinski, Jean-Marie ULg

in Revue Médicale de Liège (2002), 57(2), 79-84

During the nineties, a controversy was noted in the literature about the potential risk of using calcium antagonists in the treatment of hypertension. Several recent studies, such as the INSIGHT’s one ... [more ▼]

During the nineties, a controversy was noted in the literature about the potential risk of using calcium antagonists in the treatment of hypertension. Several recent studies, such as the INSIGHT’s one have not confirmed this provided that one uses long-acting molecule. But the real beneficial effect due to the different antihypertensive classes is mainly linked to the magnitude of the blood pressure lowering effect. [less ▲]

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See detailLes antagonistes des flux calciques dans le traitement de l'hypertension artérielle
Krzesinski, Jean-Marie ULg; Rorive, Georges ULg

in Revue Médicale de Liège (1984), 34(6), 232-237

Les antagonistes des flux calciques constituent un nouveau groupe, à part entière, de substances à action antihypertensive. Ils s'avèrent être particulièrement prometteurs dans ce domaine: ils agissent ... [more ▼]

Les antagonistes des flux calciques constituent un nouveau groupe, à part entière, de substances à action antihypertensive. Ils s'avèrent être particulièrement prometteurs dans ce domaine: ils agissent, en effet, en empêchant l'entrée de calcium à l'intérieur de la cellule musculaire lisse vasculaire et s'opposent ainsi à la contraction de celle-CI, donc à l'élévation des résistances vasculaires. Après un rappel rapide du site et du mode d'action biochimique de ces molécules, cet article tend à dégager leurs principales indications dans le traitement d'une hypertension artérielle, basées surtout sur le profil hémodynamique original engendré lors de leur administration. [less ▲]

Detailed reference viewed: 63 (1 ULg)
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See detailLes antagonistes des récepteurs de l'angiotensine II
Krzesinski, Jean-Marie ULg

in Vaisseaux, Coeur, Poumons (1998), 3(4), 116-119

Detailed reference viewed: 14 (1 ULg)
Peer Reviewed
See detailAntagonistic activity of yeast against post-harvest diseases of tropical fruits
Jijakli, Haissam ULg

Conference (2004, February)

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See detailAntagonistic activity of yeast against post-harvest diseases of tropical fruits.
Jijakli, Haissam ULg; Lassois, Ludivine ULg; Lahlali, R.

in Bulletin des Séances de l’Académie Royale des Sciences d’Outre-Mer = Mededelingen der Zittingen van de Koninklijke Academie voor Overzeese Wetenschappen (2004), 50(2), 153-163

Detailed reference viewed: 54 (15 ULg)
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See detailAntagonistic Effects of Laminin and Fibronectin in Cell-to-Cell and Cell-to-Matrix Interactions in Mcf-7 Cultures
Noël, Agnès ULg; Calle, A.; Emonard, H. et al

in In Vitro Cellular & Developmental Biology : Journal of the Tissue Culture Association (1988), 24(5), 373-80

During morphogenesis, tumor progression and metastasis, cell adhesion, dissociation, and migration result from a complex balance between cell-to-cell and cell-to-matrix interactions. Two different ... [more ▼]

During morphogenesis, tumor progression and metastasis, cell adhesion, dissociation, and migration result from a complex balance between cell-to-cell and cell-to-matrix interactions. Two different organization patterns of MCF-7 cells were induced by different extracellular matrix proteins. When plated on plastic or polymeric type I collagen gel used as a model of interstitial matrix, MCF-7 cells spread and grew in monolayer. When cultured on a solid gel of basement membrane (BM) proteins (85% laminin) used as a model of BM, cells formed clusters attached to the matrix. Matrix proteins regulated these two types of cell organization by preferentially promoting cell-to-cell or cell-support interactions. On plastic in the presence of soluble laminin or on laminin-coated dishes, cells also formed clusters. Addition of soluble fibronectin induced spreading of the cells, suggesting that laminin and fibronectin have competitive antagonistic effects on MCF-7 cell morphology. Antilaminin antibodies inhibited cluster formation and attachment, emphasizing the important role of this glycoprotein not only in promoting cluster attachment but also in cell-to-cell contact formation. Such effects of extracellular matrix proteins could play significant roles in tumor progression and metastasis. [less ▲]

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See detailAntagonistic properties of human prolactin analogs that show paradoxical agonistic activity in the Nb2 bioassay
Goffin, Vincent; Kinet, Sandrina; Ferrag, Fatima et al

in Journal of Biological Chemistry (1996), 271(28), 16573-9

Based on the assumption that the prolactin receptor (PRLR) is activated by PRL-induced sequential dimerization, potential human PRL (hPRL) antagonists were designed that sterically interfere with binding ... [more ▼]

Based on the assumption that the prolactin receptor (PRLR) is activated by PRL-induced sequential dimerization, potential human PRL (hPRL) antagonists were designed that sterically interfere with binding site 2. We previously reported the unexpected agonistic properties of these hPRL analogs in the rat Nb2 bioassay (Goffin, V., Struman, I., Mainfroid, V., Kinet, S., and Martial, J. A. (1994) J. Biol. Chem. 269, 32598-32606). In order to investigate whether such paradoxical agonistic behavior might result from characteristic features of the Nb2 assay (e.g. species specificity), we transfected in the same cell system the cDNA encoding the PRLR from rat or human species along with reporter genes containing PRL-responsive DNA sequences. We characterized the agonistic, self-antagonistic and/or antagonistic effects of wild type rat PRL, wild type hPRL, and three hPRL analogs, mutated either at binding site 1 or at binding site 2. Our results clearly show that the agonistic/antagonistic properties of PRLs are species-specific. We thus propose different models of receptor activation, depending on the relative affinities of each hormonal binding site, which is directed by species specificity. Finally, this is the first report of hPRL binding site 2 analogs showing antagonistic properties on human and, to a lesser extent, rat receptors. [less ▲]

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See detailAntarctic cyanobacteria: from diversity to genomics
Wilmotte, Annick ULg

Conference (2017, June 30)

Detailed reference viewed: 17 (0 ULg)
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See detailAntarctic cyanobacterial diversity: how important are the geographical and ecological factors?
De Carvalho Maalouf, Pedro ULg; Lambion, Alexandre ULg; Gillard, Benjamin et al

Conference (2011, February)

Detailed reference viewed: 5 (0 ULg)
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See detailAntarctic cyanobacterial diversity: how important are the geographical and ecological factors?
De Carvalho Maalouf, Pedro ULg; Lambion, Alexandre ULg; Gillard, Benjamin et al

Conference (2012, October 31)

On the Antarctic continent, cyanobacteria produce conspicuous benthic microbial mats in lakes, from the coastal regions to the mountains (till 84°S). However, little is known about theirl biodiversity in ... [more ▼]

On the Antarctic continent, cyanobacteria produce conspicuous benthic microbial mats in lakes, from the coastal regions to the mountains (till 84°S). However, little is known about theirl biodiversity in comparison with other regions of the world. The BelSPO project AMBIO aimed to test whether (i) microbial communities are structured by the same factors as those shaping communities of macroorganisms, and (ii) endemism among cyanobacteria does exist. We have analyzed the cyanobacterial biodiversity in a variety of aquatic habitats from the three main biogeographical regions (Continental, Maritime Antarctica and the Sub-Antarctic) and determined the ‘baseline’ data needed to understand the contribution of various processes that are responsible for the distribution patterns. [less ▲]

Detailed reference viewed: 33 (6 ULg)