References of "Unpublished conference"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailA New PLE Approach for Measurement of Dioxin and PCBs in Biological Samples
Focant, Jean-François ULg; Cash; Turner et al

Conference (2007, April)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailBrand Concept Maps: a New Approach to Market Segmentation
Brandt, Céline ULg; Pahud de Mortanges, Charles ULg; Bluemelhuber, Christian et al

Conference (2007, April)

This chapter aims to expand the domain of brand image perception measurement by providing a method for eliciting brand associative networks and comparing it with traditional brand image measurement ... [more ▼]

This chapter aims to expand the domain of brand image perception measurement by providing a method for eliciting brand associative networks and comparing it with traditional brand image measurement methods. This article then argues that these networks may differ from one individual to another, depending on the cultural background and/or the experience with the brand. Accordingly, the author introduces a methodology of clustering consumers with similar perceptions into distinct segments, which can be targeted differently. Using picture analysis and metaphor-based elicitation techniques, Lipton’s Ice Tea brand associations are extracted and utilized as an input for the creation of 160 individual associative networks. These networks are first aggregated to emphasize the brand reputation and subsequently clustered into 6 segments. This paper provides clear arguments for using associative networks as the preferred method to capture the complete brand image. The paper discusses implications of perceptual segmentation for image management, brand positioning, perceptual competition analysis and brand communication. [less ▲]

Detailed reference viewed: 225 (3 ULg)
See detailSpring CO2 dynamics within sea ice: abiotical versus biological control.
Delille, Bruno ULg; Borges, Alberto ULg; Lannuzel, Delphine et al

Conference (2007, April)

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailInter-annual variability of the carbon dioxide oceanic sink south of Tasmania
Borges, Alberto ULg; Tilbrook, B.; Metzl, N. et al

Conference (2007, April)

Detailed reference viewed: 12 (4 ULg)
See detailEffect of CO2 concentration on suspended particle dynamics during a mesocosm bloom experiment (Peece II)
Engel, Anja; Bellerby, R.; Delille, Bruno ULg et al

Conference (2007, April)

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailMesopelagic C mineralization at the Southern Ocean’s scale
Jacquet, S.; Dehairs; Elskens, M. et al

Conference (2007, April)

Detailed reference viewed: 11 (0 ULg)
See detailSimulation of annual cycles of phytoplankton, zooplankton and nutrients to the South of Gran Canaria
Troupin, Charles ULg; Sangrà, Pablo; Arístegui, Javier

Conference (2007, March 28)

Detailed reference viewed: 14 (0 ULg)
See detailAdministrateur central et fonctions exécutives
Collette, Fabienne ULg

Conference (2007, March 27)

Detailed reference viewed: 18 (4 ULg)
Full Text
See detailEquations for GFR estimation: application and limits
Cavalier, Etienne ULg; Delanaye, Pierre ULg

Conference (2007, March 24)

Detailed reference viewed: 6 (1 ULg)
Full Text
See detailRédiger en anglais : l’utilisation de templates
Reuchamps, Min ULg

Conference (2007, March 23)

In this paper, I argue that writing in English – for non-native – can be eased by the use of templates. Templates are pre-formatted and reusable models prepared by the author following proper publications ... [more ▼]

In this paper, I argue that writing in English – for non-native – can be eased by the use of templates. Templates are pre-formatted and reusable models prepared by the author following proper publications according to the purpose of the writing. The use of templates offers at least three advantages: first, easing the writing since it follows a pre-formatted model; second, giving to the text a more English touch; third, increasing the chances of publication since it follows models which have been published. This technique works particularly well for short texts (for instance, abstracts, short papers or book reviews). Yet, templates are only a tool amongst other and should be used with these tools. Furthermore, they limit one’s creativity and enclose the author in a pre-formatted structure. Above all, to some extent, templates reflect the way of thinking and writing shared by the Anglo-Saxon academia. [less ▲]

Detailed reference viewed: 90 (5 ULg)
Full Text
Peer Reviewed
See detailMDRD equation for GFR estimation : analytical limitations
Cavalier, Etienne ULg; Delanaye, Pierre ULg; Krzesinski, Jean-Marie ULg et al

Conference (2007, March 23)

Detailed reference viewed: 110 (1 ULg)
See detailLa prééclampsie: de la physiopathologie et prise en charge
Brichant, Jean-François ULg

Conference (2007, March 22)

Detailed reference viewed: 8 (0 ULg)
See detailSynthèse et clôture du séminaire
Halleux, Jean-Marie ULg

Conference (2007, March 21)

Detailed reference viewed: 1 (0 ULg)
Full Text
See detailUS/India Civil Nuclear Cooperation Initiative: the Question of Safeguards
Michel, Quentin ULg

Conference (2007, March 20)

Detailed reference viewed: 5 (1 ULg)
Full Text
See detailMyosite focale sur atteinte radiculaire S1
Kaux, Jean-François ULg

Conference (2007, March 19)

Detailed reference viewed: 95 (20 ULg)
Peer Reviewed
See detailL’art minimaliste américain et la question du neutre
Hagelstein, Maud ULg

Conference (2007, March 19)

Detailed reference viewed: 8 (1 ULg)
See detailLe chewing-gum et la nutrition : clichés et nouveaux mots du pouvoir
Durand, Pascal ULg

Conference (2007, March 17)

Detailed reference viewed: 7 (2 ULg)
Full Text
See detailLe conflit dans l'état civil : l'envers du droit chez Thomas Hobbes
Herla, Anne ULg

Conference (2007, March 15)

Detailed reference viewed: 1 (0 ULg)
See detailImpacts of vegetation changes on LGM climate
Henrot, Alexandra ULg; François, Louis ULg; Munhoven, Guy ULg

Conference (2007, March 12)

The impacts of vegetation change on the climate at the Last Glacial Maximum are investigated with the Earth System Model of Intermediate Complexity Planet Simulator and the dynamic vegetation model Caraib ... [more ▼]

The impacts of vegetation change on the climate at the Last Glacial Maximum are investigated with the Earth System Model of Intermediate Complexity Planet Simulator and the dynamic vegetation model Caraib (CARbon Assimilation in the Biosphere). [less ▲]

Detailed reference viewed: 18 (4 ULg)
Peer Reviewed
See detailThe fringes of psychosis proneness: unfolding the domains of risk
Laroi, Frank ULg

Conference (2007, March 10)

Detailed reference viewed: 1 (0 ULg)
See detailRigid body attitude synchronization: a consensus approach
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg; Leonard, Naomi

Conference (2007, March)

Detailed reference viewed: 19 (4 ULg)
Full Text
Peer Reviewed
See detailLe regard des intervenants et l'éventail des parents
Absil, Gaëtan ULg; Denis, Marie-Elise

Conference (2007, March)

Detailed reference viewed: 60 (17 ULg)
Peer Reviewed
See detailLa langue et le réel. Réflexions sur la motivation iconique
Polis, Stéphane ULg

Conference (2007, February 28)

Detailed reference viewed: 9 (0 ULg)
See detailWhen Mass Spectrometry meets Spectroscopy: A Different Perspective on Ion Photodissociation
Gabelica, Valérie ULg

Conference (2007, February 27)

Photodissociation methods are more and more widely used in analytical mass spectrometry as an alternative to collision-induced dissociation. A well known example is infrared multiphoton dissociation ... [more ▼]

Photodissociation methods are more and more widely used in analytical mass spectrometry as an alternative to collision-induced dissociation. A well known example is infrared multiphoton dissociation (IRMPD) with CO2 lasers (wavelength 10.6 µm), which is often preferred to SORI-CID in FTICR mass spectrometers. IR photons are absorbed by the vibrational modes of the ion, and this vibrational energy is redistributed all over the molecule. The fragmentation channels observed are usually the same as for CID. Recently, new possibilities offered by UV lasers of fixed wavelength (i.e. 157 nm or 193 nm) for peptide fragmentation were described. On the contrary to IRMPD, irradiation at these UV wavelengths gives rise to fragmentation channels which are unprecedented in CID, suggesting that photochemical reactions take place. The prerequisite for ion photodissociation is photon absorption. In the infrared, photon absorption results in the excitation of vibrational modes. Anharmonic coupling of the excited vibrational modes with other vibrational modes of the ion results in a rapid intramolecular vibrational energy redistribution (IVR). The energy of an IR photon is too low for the ion to dissociate (0.117 eV/photon for a 10.6 µm CO2 laser). Multiple cycles of absorption and IVR are necessary for IR photodissociation to occur (hence the term multiphoton). Because the first step in photodissociation is photon absorption, the recording of the photodissociation yield as a function of the photon wavenumber gives information on the vibrational modes of the ion. This is the basic principle of infrared spectroscopy experiments inside the mass spectrometer. This technique will be illustrated by a recent example on DNA single strands and quadruplex structures. The shifting of the vibrational frequencies corresponding to guanine C=O stretch gives information on the base pairing in the DNA ion in the gas phase. The situation is somewhat different with UV photons, which may lead to either electronic excitation of the ions or direct electron ejection. Electronic excited states may evolve in different ways: (1) Internal conversion to a vibrationally excited electronic ground state. Resulting fragments would then be similar to CID and IRMPD. This process can be multiphotonic and could be coined UVMPD. (2) Electron autodetachment, leading to the formation of radicals that can be further fragmented to obtain ECD-like or EDD-like fragments. (3) Photochemical reactions giving rise to unprecedented fragmentation channels. In all three cases, product ion yield is conditioned by photon absorption by an electronic state, meaning that UV spectroscopy of gas-phase ions can be performed with a mass spectrometer. We recently explored the effects of photon absorption on multiply charged DNA anions. Depending on the photon wavelength and on the chromophores, all three situations could be observed. Electron photodetachment is the major channel observed when using wavelengths corresponding to DNA base absorption.1,2 When irradiated at proper wavelength, chromophoric DNA ligands also give rise to electron photodetachment. UV-visible spectra of the DNA duplexes and complexes were recorded and compared with solution-phase spectra. Finally, a porphyrin ligand gives rise to specific fragmentation pathways when irradiated at 450 nm, while photodetachment is observed at 260 nm. The most recent results will be presented and discussed. 1. Gabelica, V.; Tabarin, T.; Antoine, R.; Rosu, F.; Compagnon, I.; Broyer, M.; De Pauw, E.; Dugourd, P. Electron Photodetachment Dissociation of DNA Polyanions in a Quadrupole Ion Trap Mass Spectrometer. Anal. Chem. 2006, 78 (18), 6564. 2. Gabelica, V.; Rosu, F.; Tabarin, T.; Kinet, C.; Antoine, R.; Broyer, M.; De Pauw, E.; Dugourd, P. Base-Dependent Electron Photodetachment from Negatively Charged DNA Strands upon 260-nm Laser Irradiation. J. Am. Chem. Soc. 2007, accepted for publication. [less ▲]

Detailed reference viewed: 34 (1 ULg)
Peer Reviewed
See detailSecondary dispersal by dung beetles of seeds primarily dispersed by tamarins
Culot, Laurence ULg

Conference (2007, February 22)

Detailed reference viewed: 9 (1 ULg)
See detailImpact des mesures judiciaires alternatives pour les consommateurs de drogues
Fincoeur, Bertrand ULg

Conference (2007, February 21)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailInternational Foundation for Research in Paraplegia
Martin, Didier ULg

Conference (2007, February 20)

Detailed reference viewed: 1 (0 ULg)
Peer Reviewed
See detailL'emprunt linguistique comme marqueur de vitalité des langues
Baiwir, Esther ULg

Conference (2007, February 09)

Detailed reference viewed: 26 (0 ULg)
Full Text
Peer Reviewed
See detail"Ethno-évaluation" : le savoir des acteurs comme théorie de l'action
Absil, Gaëtan ULg

Conference (2007, February)

Detailed reference viewed: 55 (29 ULg)
Peer Reviewed
See detail3D image analysis characterization of dried banana
Léonard, Angélique ULg; Devahastin, Sakamon; Blacher, Silvia ULg

Conference (2007, February)

Detailed reference viewed: 25 (0 ULg)
Peer Reviewed
See detailTransfert d'image et hybridation post-traumatique
Hamers, Jérémy ULg

Conference (2007, February)

Detailed reference viewed: 7 (0 ULg)
See detailSuivi diachronique de l’analyse de corpus partagés
Bénel, Aurélien; Lejeune, Christophe ULg

Conference (2007, January 26)

Les anthropologues des sciences ont développé un mode d'inscription permettant le suivi de l'innovation qu'ils appellent "graphe socio-technique". Cette contribution présente les tentatives d'application ... [more ▼]

Les anthropologues des sciences ont développé un mode d'inscription permettant le suivi de l'innovation qu'ils appellent "graphe socio-technique". Cette contribution présente les tentatives d'application de ce dispositif de visualisation au suivi de l'activité sur des plateformes informatiques. Elle soulève des difficultés à la fois techniques et méthodologiques. [less ▲]

Detailed reference viewed: 14 (3 ULg)
See detailLa pression intracrânienne normale et pathologique
Martin, Didier ULg

Conference (2007, January 22)

Detailed reference viewed: 7 (2 ULg)
See detailLe néokantisme comme forme symbolique ? Merleau-Ponty et Panofsky
Cormann, Grégory ULg

Conference (2007, January 17)

Detailed reference viewed: 18 (0 ULg)
See detailLes insultes de la cour de récréation
Meunier, Deborah ULg

Conference (2007, January 12)

Detailed reference viewed: 16 (1 ULg)
Peer Reviewed
See detailParturition Induction in the mare. Why and when? Case Report
Ponthier, Jérôme ULg; Salciccia, Alexandra ULg; Sandersen, Charlotte ULg et al

Conference (2007, January)

INTRODUCTION Some conditions require induction of parturition: colic, severe hyperlipemia, prepubian tendon rupture, premature placental separation, hydroallantoïd, and foetal distress2,4,5. Prolonged ... [more ▼]

INTRODUCTION Some conditions require induction of parturition: colic, severe hyperlipemia, prepubian tendon rupture, premature placental separation, hydroallantoïd, and foetal distress2,4,5. Prolonged gestation is not a good indication1,4. Protocols using oxytocin, prostaglandins or corticosteroids can induce parturition2,3,4,5. Most induction protocols use low doses of oxytocin2,3,5. OBJECTIVE On the basis of a clinical case, this poster will discuss the indications, the methods and the risks of parturition induction in the mare. CLINICAL CASE A pony mare at day 310 of pregnancy is presented for colic with poor prognosis. The foetal parameters are good and the cervix begins to open. There is no milk in the udder. The decision to save the foal is taken and parturition is induced by one oxytocin bolus (20 I.U./IV) followed by an oxytocin infusion (100 I.U. in 1000ml saline). After assisted foaling, the foal rises and sucks commercial colostrum within 30 minutes. Soon, the foal becomes depressed and, despite treatment with commercial plasma, tube feeding and antibiotics, dies at day 2. DISCUSSION This case required immediate induction of foaling, which was achieved by administration of high doses of oxytocin. Commonly, high doses of oxytocin induce dystocia because the foal has no time to move to correct (dorso-sacral) presentation1,2,5. The risks for the foal include absence of colostrum and foetal immaturity1,2,3,4,5. Even after day 300, the prognosis is poor1,2,3,4. A good prognostic indicator of the foal’s maturity (lung, and other systems) is the electrolytes concentration in the mother’s milk2,4. These protocols should be used when foetal maturity is ascertained or as last resort1,2,3,4. CONCLUSIONS Foaling induction is risky for dystocia and foal outcome. It should be reserved to cases where foal’s maturity can be assessed. [less ▲]

Detailed reference viewed: 90 (14 ULg)
Full Text
See detailAbstract numeration systems and recognizability
Charlier, Emilie ULg

Conference (2007, January)

In this talk, I will present some results concerning multiplication by a constant in an abstract numeration system built on a bounded language. More precisely, we will show that this operation does not ... [more ▼]

In this talk, I will present some results concerning multiplication by a constant in an abstract numeration system built on a bounded language. More precisely, we will show that this operation does not preserve regularity, and therefore cannot be computed by a finite automaton. [less ▲]

Detailed reference viewed: 5 (1 ULg)
Full Text
See detailCutting planes from lattice-point-free polyhedra
Louveaux, Quentin ULg

Conference (2007, January)

In this talk, we generalize the concept of a split (that leads to split cuts) to any lattice-point-free polyhedron. We show how we can generate cutting planes for a polyhedron from these objects ... [more ▼]

In this talk, we generalize the concept of a split (that leads to split cuts) to any lattice-point-free polyhedron. We show how we can generate cutting planes for a polyhedron from these objects. Associated to any lattice-point-free polyhedron, we define a "split-dimension" (which is equal to 1 in the case of a split in the usual sense). We then consider the operation of adding to a polyhedron all cutting planes that we can obtain from considering all the lattice-point-free polyhedra with a split-dimension lower or equal to d. We call the obtained object the "d-dimensional split closure" of the initial polyhedron. We discuss whether this object is again a polyhedron or not. As an important illustration, we focus on objects of split-dimension equal to 1 or 2. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Full Text
Peer Reviewed
See detailMonitoring an odour in the environment with an electronic nose : requirements for the signal processing
Romain, Anne-Claude ULg; Delva, Julien ULg; Nicolas, Jacques ULg

Conference (2007, January)

Artificial olfaction system (the so-called electronic nose) is a very promising tool to monitor the malodour in the field. Usual measurement techniques of odour use human olfaction or conventional ... [more ▼]

Artificial olfaction system (the so-called electronic nose) is a very promising tool to monitor the malodour in the field. Usual measurement techniques of odour use human olfaction or conventional analytical techniques. The first category represents the real odour perception but is not applicable to measure continuously bad odours in the field. The second class of techniques gives the mixture composition but not the global information representative of the odour perception. The e-nose has the potentialities to combine "the odour perception" and the "monitoring in the field". However to be able to reach that goal, the signal processing has to be adapted to work in complex environment. The research group in Arlon has more than ten years experience in the measure of environmental malodours in the field. The paper presents the minimal requirements that the group considers as essential for artificial olfaction system to become successful for this application. [less ▲]

Detailed reference viewed: 47 (17 ULg)
Full Text
See detailQuark model: recent issues
Stancu, Floarea ULg

Conference (2007)

In the first part I briefly survey recent issues in constituent quark models raised by the observation of unusual hadronic states. In particular I discuss the role of higher Fock components in the wave ... [more ▼]

In the first part I briefly survey recent issues in constituent quark models raised by the observation of unusual hadronic states. In particular I discuss the role of higher Fock components in the wave function of baryons and the possible interpretation of open charm and of new charmonium-type resonances as tetraquarks. In the second part I show support for the quark model dynamics obtained in a model independent way from the 1/Nc expansion approach of QCD which proved to be successful in describing baryon properties. [less ▲]

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailOsteoblast : a cell under compression
Sanchez, Christelle ULg

Conference (2007)

Detailed reference viewed: 11 (0 ULg)
See detailA Nested Model of the Cariaco Basin: Study of the Hydrography and Interactions with the Open Ocean
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Virmani, J. I. et al

Conference (2007)

The circulation of the Cariaco Basin (Venezuela) is modeled using the Regional Ocean Model System (ROMS) nested in the global 1/12 degree Hybrid Coordinate Ocean Model (HYCOM). The objective of this work ... [more ▼]

The circulation of the Cariaco Basin (Venezuela) is modeled using the Regional Ocean Model System (ROMS) nested in the global 1/12 degree Hybrid Coordinate Ocean Model (HYCOM). The objective of this work is to obtain a better understanding of the Cariaco Basin circulation by studying the processes that link the basin with the Caribbean Sea. To our knowledge, this is the first attempt to model the circulation in the Cariaco Basin with a nested high resolution hydrodynamical model. In particular, we examined the interaction of the Cariaco Basin with the large-scale, open-ocean processes, as the westward Caribbean Current and the eastward subsurface counter-current flowing along the South America Caribbean coast. These two current systems connect the Cariaco Basin with the Caribbean Sea waters, and therefore are directly related to the ventilation of the basin. By studying the kinematics and dynamics of the Cariaco Basin we anticipate gaining a better understanding on how the past conditions affected the basin characteristics and hence the geological records obtained from the basin sediments. We will report on several years of observations from the continuous monitoring of currents within the basin, plus analyses of year-long model runs that provide a basin-wide, three-dimensional context for the circulation. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Peer Reviewed
See detailHmty-km and the egyptian bronzes polychromy:A study of the Egyptian collection of the Louvre museum
Mathis, François ULg; Delange, Elisabeth; Robcis, Dominique et al

Conference (2007)

Detailed reference viewed: 9 (0 ULg)
Peer Reviewed
See detailComparative pharmacokinetics of two intravenous dosage rates of tiludronate in healthy adult horses
Delguste, Catherine ULg; Amory, Hélène ULg; Guyonnet, Jérôme et al

Conference (2007)

Plasma and urine pharmacokinetics of tiludronate administered once daily as an intravenous bolus of 0.1 mg/kg for ten consecutive days (group 1, n=6) was compared to a single slow infusion of 1 mg/kg ... [more ▼]

Plasma and urine pharmacokinetics of tiludronate administered once daily as an intravenous bolus of 0.1 mg/kg for ten consecutive days (group 1, n=6) was compared to a single slow infusion of 1 mg/kg (group 2, n=6) in healthy adult horses. Plasma samples were collected at regular intervals for a period of 16 and 7 days in groups 1 and 2 respectively. Continuous urine collection for determination of cumulative urinary excretion of tiludronate was performed during 16 and 7 days in groups 1 and 2 respectively, and over 24-hour periods every 10 days until 60 days after the last tiludronate administration in both groups. Tiludronate concentrations were obtained in all plasma and urine samples using HPLC with UV detection. Plasma pharmacokinetic parameters were determined using a noncompartmental approach. Group 1 mean (± SD) AUCss was 3.76 (±0.698) mg.h.L-1 and group 2 mean (± SD) AUCtot was 39.07 (±3.699) mg.h.L-1. Mean (± SD) clearance (Cl) was 0.027 (±0.0042) and 0.026 (±0.0022) L.h-1.kg-1 in groups 1 and 2, respectively. Neither the dose corrected AUC (p=0.724) nor the Cl (p=0.528) were statistically different between groups. Relative plasma bioavailability (infusion versus bolus) was 103%. Cumulative urine tiludronic acid excretion could not be compared between groups due to analytical limitations (LOQ of 0.025 mg.L-1), which led to numerous missing data particularly in group 1, and an inability to conduct appropriate statistical and pharmacokinetic analyses. In conclusion, both dosage rates of tiludronate were considered bioequivalent with regards to plasma pharmacokinetics. [less ▲]

Detailed reference viewed: 25 (1 ULg)
See detailDetecting awareness in impaired states of consciousness
Vanhaudenhuyse, Audrey ULg

Conference (2007)

Detailed reference viewed: 2 (1 ULg)
Peer Reviewed
See detailLe marché et l'état à l'heure de la mondialisation
Bourgeois, Marc ULg

Conference (2007)

Detailed reference viewed: 8 (1 ULg)
See detailThe metabolome of developing pea seeds
Vigeolas, Hélène ULg

Conference (2007)

Detailed reference viewed: 5 (1 ULg)
Peer Reviewed
See detailPhysiopathologie des troubles psychosomatiques du nourrisson
Battisti, Oreste ULg

Conference (2007)

Une mère rencontre son enfant, les intervenants se rencontrent. Les aspects suivants sont abordés: la santé pré et post-natale; évaluation des défaillanes précoces; les besoins des services judiciaires ... [more ▼]

Une mère rencontre son enfant, les intervenants se rencontrent. Les aspects suivants sont abordés: la santé pré et post-natale; évaluation des défaillanes précoces; les besoins des services judiciaires; manifestations somatiques d'une triade en souffrance; attents et besoins de gynécologues et des pédiatres. [less ▲]

Detailed reference viewed: 79 (6 ULg)
See detailIAS Mesoscale Surface Circulation Observed Through Satellite Altimetry and its Influence in a Small Scale, Coastal Domain, Studied with a ROMS Model of the Cariaco Basin
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Virmani, J. I. et al

Conference (2007)

The Intra-Americas Sea (IAS) surface circulation is characterized by large scale currents. The Caribbean current, which originates in the Lesser Antilles, travels westwards through the Caribbean Sea and ... [more ▼]

The Intra-Americas Sea (IAS) surface circulation is characterized by large scale currents. The Caribbean current, which originates in the Lesser Antilles, travels westwards through the Caribbean Sea and eastern Mexico and passes through the Gulf of Mexico to finally form the Gulf Stream. This complex system of currents is also characterized by a high mesoscale variability, such as eddies and meanders. The objectives of this work are twofold: first, the multi-scale surface circulation of the IAS is described using satellite altimetry. The topographic influence of the different basins forming the IAS, the characteristic time and spatial scales, and the time variability of the surface circulation will be addressed. The second objective is to analyze the influence of this large scale circulation on a small scale coastal domain with a ROMS-based model of the Cariaco basin (Venezuela). Cariaco is a deep (1400 m), semi-enclosed basin connected to the open ocean by two shallow channels (Tortuga and Centinela Channels). Its connection with the open sea, and therefore the ventilation of the basin, occurs in the surface layers. The Cariaco ROMS model will be used to study the exchanges of mass, heat and salt through the channels. A 1/60 degree ROMS model nested in the global 1/12 degree HYCOM model from the Naval Research Laboratory will be used for this study. In addition, a series of observations (satellite altimetry and in situ temperature, salinity and velocity data), will be used to assess the influence of the Caribbean circulation on the basin. [less ▲]

Detailed reference viewed: 22 (2 ULg)
Peer Reviewed
See detailMercury in the blood of free ranging pinnipeds: levels, sources of variation, toxicocinetic and potential impact using an in vitro model
Das, Krishna ULg; Gillet, Marie-Claire ULg; Habran, Sarah ULg et al

Conference (2007)

Despite 30 years of international regulations, Hg levels in marine mammals have not decreased. Various environmental models even suggest a rise of mercury in the biota during the next decades, linked to ... [more ▼]

Despite 30 years of international regulations, Hg levels in marine mammals have not decreased. Various environmental models even suggest a rise of mercury in the biota during the next decades, linked to climate change. The objective of this study is (1) to assess Hg levels in blood samples of free-ranging pinnipeds, (2) to understand level variation during different periods of life (gestation, lactation, fasting) and potential impact on lymphocytes using a preliminary in vitro model (peripheral blood mononuclear cells, PBMC). Blood samples were collected from harbour seals (Phoca vitulina n= 22) from the North Sea and from elephant seals from the Californian coast (Mirounga angustirostris 12 females and 12 pups). Harbour seal PBMC were isolated, set in medium culture and contaminated with methyl-Hg (1 µM). Biological tests and proteomic assay were realized on control and contaminated PBMC. Hg levels were from the same order of magnitude for the two species despite two different lifestyles and habitats: from 40 to 590 ng.g-1 fw in harbour seal and from 63 to 919 ng.g-1 fw in elephant seal. Hg concentrations in the blood depend upon several factors such as body weight, fasting and lactation duration for mothers and pups. After 21 days of lactation, female elephant seals doubled their blood Hg levels (from 308 to 593 ng.g-1fw) while a decrease is observed for pups. This increase is linked to mobilization from blubber and muscle during fasting associated to lactation. Cell model revealed an in vitro effect of Hg even at low concentration (1µM). Number of PBMC, viability, metabolic activity, DNA and RNA synthesis were reduced in vitro suggesting deleterious effects of Hg in concentrations encountered in free-ranging pinnipeds. Knowing that Hg methylation in the ocean is linked to temperature, one can wonder on Hg levels (and effects) in pinnipeds during the next decades. [less ▲]

Detailed reference viewed: 62 (3 ULg)
See detailHow become waxed and wax became a copula
Petré, Peter ULg

Conference (2007)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailCathéter épicutanéo-cave double voie versus simple voie: une étude randomisée chez le nouveau-né prémature
Marion, W.; Battisti, Oreste ULg; Anthopoulou, N. et al

Conference (2007)

Detailed reference viewed: 82 (6 ULg)
See detailInterest of DOC in the study of consciousness
Vanhaudenhuyse, Audrey ULg

Conference (2007)

Detailed reference viewed: 4 (0 ULg)
See detailError analysis of a high-resolution physical model of the Mediterranean Sea
Vandenbulcke, Luc ULg; Barth, Alexander ULg; Alvera Azcarate, Aïda ULg et al

Conference (2007)

We analyze the errors that are inevitably associated to hydrodynamic models, in a realistic case. The error of the GHER model in the Mediterranean Sea has already been studied in e.g. Beckers et al. (2000 ... [more ▼]

We analyze the errors that are inevitably associated to hydrodynamic models, in a realistic case. The error of the GHER model in the Mediterranean Sea has already been studied in e.g. Beckers et al. (2000) by comparing it with other primitive equation models, or in Alvera (2004) by comparing the model with observations and with the climatology, using usual statistical methods and also wavelet decompositions. In this study, we rather study the sensitivity of the model to various variables using an ensemble of models. We chose a relatively high resolution, 1/16°, corresponding to the resolution now used in operational OGCMs covering the Mediterranean, such as the MFS system (http://www.bo.ingv.it/mfs). We explain how we generated an ensemble of model simulations, where various more-or-less well known inputs are allowed to vary according to the uncertainty affecting them. Statistics calculated on this ensemble are, in fact, the response of the non-linear hydrodynamic system to errors on the forcing terms. When those statistics are calculated at a certain timestep, they allow us to provide a spatial analysis of the model error; statistics calculated over the time dimension will show whether errors are intensified by the system, or rather disappear. The model error is interesting as such. However, it can also be used for different purposes. For example, it allows using data assimilation techniques without needing the usual assumptions of reduced-rank Kalman Filters. It also allows studying the sensitivity of coupled model (biological, oil spill, search-and-rescue, …) to physical forcings. [less ▲]

Detailed reference viewed: 11 (2 ULg)
Full Text
See detailSperm quality and cryopreservation in Perca fluviatilis
Linhart, Ottomar; Alavi Hadi, S. M.; Rodina, M. et al

Conference (2007)

Detailed reference viewed: 13 (1 ULg)