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See detailDINEOF reconstruction of clouded images including error maps. Application to the Sea-Surface Temperature around Corsican Island
Beckers, Jean-Marie ULg; Barth, Alexander ULg; Alvera Azcarate, Aïda ULg

in Ocean Science (2006), 2

We present an extension to the Data INterpolating Empirical Orthogonal Functions (DINEOF) technique which allows not only to fill in clouded images but also to provide an estimation of the error ... [more ▼]

We present an extension to the Data INterpolating Empirical Orthogonal Functions (DINEOF) technique which allows not only to fill in clouded images but also to provide an estimation of the error covariance of the reconstruction. This additional information is obtained by an analogy with optimal interpolation. It is shown that the error fields can be obtained with a clever rearrangement of calculations at a cost comparable to that of the interpolation itself. The method is presented on the reconstruction of sea-surface temperature in the Ligurian Sea and around the Corsican Island (Mediterranean Sea), including the calculation of inter-annual variability of average surface values and their expected errors. The application shows that the error fields are not only able to reflect the data-coverage structure but also the covariances of the physical fields. [less ▲]

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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 detailInfluence du degré de mouture et de l'extrusion sur la valeur nutritionnelle de la graine de lupin
Froidmont, Eric; Bonnet, Maxime; Beckers, Yves ULg et al

in Rencontres autour des Recherches sur les Ruminants (2006), 12

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See detailClinical features and hormonal profiles of cloprostenol-induced early abortions in heifers monitored by ultrasonography
Lobago, Fikre; Gustafsson, Hans; Bekana, Merga et al

in Acta Veterinaria Scandinavica (2006), 48(23), 1-9

Background: The present study describes the clinical features and plasma profiles of bovine pregnancy-associated glycoprotein 1 (bPAG1), the main metabolite of prostaglandin F2a (PG metabolite) and ... [more ▼]

Background: The present study describes the clinical features and plasma profiles of bovine pregnancy-associated glycoprotein 1 (bPAG1), the main metabolite of prostaglandin F2a (PG metabolite) and progesterone (P4) in heifers in which early abortions were induced. Methods: Early abortions were induced in four heifers with cloprostenol and monitored by ultrasonography. Blood samples were collected and the plasma were analyzed for bPAG 1, P4 and PG metabolite. Results: The foetal heartbeat rates varied from 170-186 beats per minute for all foetuses up to the date of cloprostenol treatment. Foetal death was confirmed within two days after cloprostenol treatment. Prior to cloprostenol injection, blood plasma concentrations of bPAG1, PG metabolite and P4 varied from 8.4-40.0 ng/mL, 158-275 pmol/L and 20.7-46.9 nmol/L, respectively. After the foetus expelled, the plasma level of bPAG1 began to decrease but the decrease was small and gradual. The estimated half-life of bPAG1 was 1.8-6.6 days. The plasma level of the PG metabolite started to have short lasting peaks (above 300 pmol/L) within three hours after cloprostenol treatment. The plasma concentrations of P4 dropped sharply to less than 4 nmol/L after 24 hours of cloprostenol injection. Conclusion: The current findings indicated that after early closprostenol-induced foetal death, the plasma concentration of bPAG1 decreased gradually and showed a tendency of variation with the stages of pregnancy. [less ▲]

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See detailLangues et immigration dans l’enseignement en Communauté française de Belgique
Lucchini, Silvia ULg

in Conseil supérieur de la langue française et Service de la langue française de la Communauté française de Belgique (Ed.) Langue française et diversité linguistique (2006)

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See detailOrbitofrontal dysfunction related to both apathy and disinhibition in frontotemporal dementia
Peters, Frederic; Perani, Daniela; Herholz, Karl et al

in Dementia & Geriatric Cognitive Disorders (2006), 21(5-6), 373-379

Orbitofrontal metabolic impairment is characteristic of the frontal variant of frontotemporal dementia (fv-FTD), as are early changes in emotional and social conduct. Two main types of behavioral ... [more ▼]

Orbitofrontal metabolic impairment is characteristic of the frontal variant of frontotemporal dementia (fv-FTD), as are early changes in emotional and social conduct. Two main types of behavioral disturbances have been distinguished in fv-FTD patients: apathetic and disinhibited manifestations. In this study, we searched for relationships between brain metabolism and presence of apathetic or disinhibited behavior. Metabolic activity and behavioral data were collected in 41 fv-FTD patients from European PET centers. A conjunction analysis of the PET data showed an expected impairment of metabolic activity in the anterior cingulate, ventromedial and orbital prefrontal cortex, the dorsolateral prefrontal cortex and the left anterior insula in fv-FTD subjects compared to matched controls. A correlation was observed between disinhibition scores on the Neuropsychiatric Inventory scale and a cluster of voxels located in the posterior orbitofrontal cortex ( 6, 28, - 24). Comparison of brain activity between apathetic and nonapathetic fv-FTD patients from two centers also revealed a specific involvement of the posterior orbitofrontal cortex in apathetic subjects ( 4, 22, - 22). The results confirm that the main cerebral metabolic impairment in fv-FTD patients affects areas specializing in emotional evaluation and demonstrate that decreased orbitofrontal activity is related to both disinhibited and apathetic syndromes in fv-FTD. Copyright (C) 2006 S. Karger AG, Basel. [less ▲]

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See detailHeat pumping and reversible air-conditioning : a new project of the international energy agency.
Afjei, Th.; Andre, Philippe ULg; Halozan, H. et al

in Bertoldi, Paolo; Atanasiu, Bogdan (Eds.) Proceeding of the international conference IEECB'06 (2006)

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See detailIdentification of novel and recurrent glucokinase mutations in Belgian and Luxembourg maturity onset diabetes of the young patients.
Vits, L.; Beckers, D.; Craen, M. et al

in Clinical Genetics (2006), 70(4), 355-9

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See detailAnti-Hemostatic Effects Of A Serpin From The Saliva Of The Tick Ixodes Ricinus
Prevot, Pp.; Adam, B.; Boudjeltia, Kz. et al

in Journal of Biological Chemistry (2006), 281(36), 26361-9

Serpins (serine protease inhibitors) are a large family of structurally related proteins found in a wide variety of organisms, including hematophagous arthropods. Protein analyses revealed that Iris ... [more ▼]

Serpins (serine protease inhibitors) are a large family of structurally related proteins found in a wide variety of organisms, including hematophagous arthropods. Protein analyses revealed that Iris, previously described as an immunomodulator secreted in the tick saliva, is related to the leukocyte elastase inhibitor and possesses serpin motifs, including the reactive center loop (RCL), which is involved in the interaction between serpins and serine proteases. Only serine proteases were inhibited by purified recombinant Iris (rIris), whereas mutants L339A and A332P were found devoid of any protease inhibitory activity. The highest Ka was observed with human leukocyte-elastase, suggesting that elastase-like proteases are the natural targets of Iris. In addition, mutation M340R completely changed both Iris substrate specificity and affinity. This likely identified Met-340 as amino acid P1 in the RCL. The effects of rIris and its mutants were also tested on primary hemostasis, blood clotting, and fibrinolysis. rIris increased platelet adhesion, the contact phase-activated pathway of coagulation, and fibrinolysis times in a dose-dependent manner, whereas rIris mutant L339A affected only platelet adhesion. Taken together, these results indicate that Iris disrupts coagulation and fibrinolysis via the anti-proteolytic RCL domain. One or more other domains could be responsible for primary hemostasis inhibition. To our knowledge, this is the first ectoparasite serpin that interferes with both hemostasis and the immune response. [less ▲]

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See detailLe syndrome de Prader Willi: intérêt d'une prise en charge pluridisciplinaire
Salmon, C.; Gaillez, Stephanie ULg; Pieltain, Catherine ULg et al

in Revue Médicale de Liège (2006), 61(7-8, Jul-Aug), 593-599

Prader Willi syndrome can be viewed as a physiopathological model of obesity. Such patients deserve specific management, preferably in a multidisciplinary setting. The paper reports on 6 patients followed ... [more ▼]

Prader Willi syndrome can be viewed as a physiopathological model of obesity. Such patients deserve specific management, preferably in a multidisciplinary setting. The paper reports on 6 patients followed in the paediatric endocrine service at the University of Liege. [less ▲]

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See detailVertebrate origins: does the tunic make the man?
Delsuc, Frédéric; Baurain, Denis ULg; Philippe, Hervé

in Medecine Sciences : M/S (2006), 22(8-9, AUG-SEP), 688-690

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See detailLa notion de point de vue dans l'élaboration de la métaphysique leibnizienne
Bouquiaux, Laurence ULg

in Timmermans, Benoît (Ed.) Perspective Leibniz, Whitehead, Deleuze (2006)

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See detailEtude du mécanisme de production de sons chez Amphiprion clarkii (Pomacentridae)
Colleye, Orphal ULg

Master of advanced studies dissertation (2006)

Les Pomacentridae constituent une des familles de l’ordre des Perciformes pour lesquels le comportement acoustique a déjà été avéré chez de nombreuses espèces. A l’heure actuelle, sept genres sont ... [more ▼]

Les Pomacentridae constituent une des familles de l’ordre des Perciformes pour lesquels le comportement acoustique a déjà été avéré chez de nombreuses espèces. A l’heure actuelle, sept genres sont référencés comme étant des producteurs de sons : Amphiprion, Dascyllus, Stegastes, Chromis, Abudefduf, Plectroglyphidodon et Hemichromis. Les émissions sonores interviennent principalement dans la reproduction et la défense de territoire ; contribuant ainsi à la survie et au succès reproducteur des individus. Les Amphiprioninae, mieux connus sous le nom de poissons-clowns, créent de véritables clans familiaux au sein d’une même actinie autour de laquelle ils déterminent leur territoire. Ainsi, la production de sons semble jouer un rôle important dans leur comportement ; la structure sociale qui règne chez ces poissons impliquant le respect de la territorialité et de la hiérarchie, les émissions sonores pourraient notamment avoir comme rôle de maintenir une bonne cohésion au sein du groupe. Malgré plusieurs études réalisées sur la production de sons chez les Amphiprion, aucune explication satisfaisante du mécanisme producteur de sons n’a été développée, seules quelques hypothèses ont été formulées. Ce travail repose sur une approche biomécanique de la production de sons basée sur la réalisation de films aux rayons X à l’aide d’une caméra à haute vitesse, combinée à une étude de morphologie fonctionnelle. Le mécanisme sonore serait autre que ceux habituellement proposés (l’action de la vessie natatoire et le grincement des dents des mâchoires pharyngiennes). Il impliquerait la mise en mouvement de nombreuses structures squelettiques, notamment la dépression du plancher pharyngien ; ce dernier engendrerait alors la tension du ligament angulo-cératohyal dont la mise en vibration pourrait être à l’origine des émissions sonores [less ▲]

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See detailAn inductive and opportunistic detection of a pedagogical pattern in a 17 online course sample
Verpoorten, Dominique ULg; Poumay, Marianne ULg; Delcomminette, Séverine ULg et al

in Proceedings of the European Distance Education Network (2006)

LabSET (Support Lab for Telematic Learning – University of Liège, Belgium) applied a pedagogical pattern detection process on 17 online courses designed by faculty. The analysis unearths 11 instances of ... [more ▼]

LabSET (Support Lab for Telematic Learning – University of Liège, Belgium) applied a pedagogical pattern detection process on 17 online courses designed by faculty. The analysis unearths 11 instances of an activity structure named here RQAT (Reading-Questions/Answers-Test) which offers an alternative (among others) to the conventional lecturing, still extensively practiced in higher education. The recurrence and the relative invariance of the RQAT learning design legitimated an attempt to format it as a pedagogical pattern, used within LabSET's missions of teacher professional development. The conceptual documentation of RQAT suggests also an "illustration" of the pattern and its linkage to a taxonomy of skills. [less ▲]

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See detailApport de la granulométrie laser dans la caractérisation physique des fillers calcaires
Michel, Frédéric ULg; Courard, Luc ULg

in Arliguie, Ginette (Ed.) Compte-rendu des Journées Scientifiques du (RF)2B (2006)

On assiste actuellement en Belgique à une baisse importante de la production des matériaux habituellement employés comme additions dans les composites à matrice cimentaire (cendres volantes, laitier de ... [more ▼]

On assiste actuellement en Belgique à une baisse importante de la production des matériaux habituellement employés comme additions dans les composites à matrice cimentaire (cendres volantes, laitier de haut fourneau). Pour faire face à ce problème, un vaste programme de recherche a été mis sur pied dans le but d’évaluer le potentiel de valorisation de fillers calcaires, de production wallonne, dans ce secteur. Ce papier traite des techniques utilisées pour caractériser de manière physique les fillers calcaires. Une étude paramétrique a permis de définir les conditions optimales de mesure de leur granulométrie par diffraction laser. Les résultats ont été comparés à ceux obtenus par la technique plus classique de tamisage en voie humide. La surface spécifique des poudres a également été mesurée par adsorption d’azote (méthode BET), par perméabilité (Blaine) et calculée à partir des résultats de la diffraction, via le diamètre de Sauter. [less ▲]

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See detailImpact of the invasive alien plant Solidago giganteaon primary productivity, plant nutrient content and soil mineral nutrient concentrations
Vanderhoeven, SONIA ULg; Dassonville, Nicolas; Chapuis-Lardy, Lydie et al

in Plant and Soil (2006), 286(1-2), 259-268

Invasion by alien plants can alter ecosystem processes and soil properties. In this study, we compared aboveground productivity, nutrient pools in standing biomass and topsoil (0-0.10 m) mineral nutrient ... [more ▼]

Invasion by alien plants can alter ecosystem processes and soil properties. In this study, we compared aboveground productivity, nutrient pools in standing biomass and topsoil (0-0.10 m) mineral nutrient concentrations between plots invaded by Early Goldenrod (Solidago gigantea) and adjacent, uninvaded, vegetation at five sites in Belgium. The five sites were characterised by a resident perennial herbaceous vegetation and spanned a wide range in soil fertility level and floristic composition. Invaded stands consistently had higher (2-3-fold) aboveground productivity and lower mineral element concentrations in standing phytomass. Nutrient pools (calculated as concentration x phytomass) was ca. twice higher in invaded plots, suggesting that S. gigantea might enhance nutrient cycling rates. Impacts on topsoil chemistry were surprisingly modest, with slightly higher nutrient concentrations under the invader. A noticeable exception was phosphorus, which showed higher concentrations of ammonium acetate-extractable fraction in invaded plots in four of five sites. It appears that S. gigantea does not significantly contribute to nutrient uplift from deep soil layers to topsoil, possibly because it does not root much deeper compared to resident vegetation. [less ▲]

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See detailL'asthme: diagnostic et évaluation.
LOUIS, Renaud ULg

in Demedts, M; Yernault, JC; Pauwels, R (Eds.) Asthme et BPCO (2006)

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