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See detailVers une révision de la norme de production d'azote de la vache laitière : justification et conséquences sur le taux de liaison
Lambert, Richard; De Toffoli, M.; Dufrasne, Isabelle ULg et al

in Marcoen, Jean Marie; Vandenberghe, Christophe (Eds.) Acte de l'atelier "Nitrate - Eau" (2010)

Towards a revison of the dairy cow’s standard for nitrogen production: justification and what are consequences for soil link rate of dairy farms. At present, the dairy cow’s standard of nitrogen ... [more ▼]

Towards a revison of the dairy cow’s standard for nitrogen production: justification and what are consequences for soil link rate of dairy farms. At present, the dairy cow’s standard of nitrogen production in Walloon region is 90 kg per year. This standard is used to calculate the “soil link rate” of farms, a balance between the organic nitrogen to be spread on land and the quantity legally authorized considering grassland and arable land area. This standard is appreciably lower than that fixed by other member states and was criticized by the European Commission during the negotiations having ended in the second program of sustainable nitrogen management. Further to new studies, it seems that the gaseous loss of nitrogen averages in buildings and during the storage is weaker than the 15% value which was used to justify this 90 kg standard. It also seems that there are big differences of average dairy production and average rate of urea according to the agricultural regions and consequently that regional production standards correspond better to the reality. On basis of these mean values, the dairy cow’s annual productions of nitrogen vary between 81 kg per year in grassy region of Fagne and 99 kg per year in Haute Ardenne and in grassy region from Liege. For the Walloon region in general, the average production is 94 kg per year. The adoption of different values of dairy cow’s nitrogen production by region would lead to an increase of 8% of the soil link rate of dairy farms in Haute Ardenne and of 7% in grassy region from Liege and a decrease of 7% in grassy region of Fagne. [less ▲]

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See detailSelectivity in small molecule binding to human telomeric RNA and DNA quadruplexes
Collie, Gavin; Reszka, Anthony P.; Haider, Shozeb M. et al

in Chemical Communications (2009), (48), 7482-7484

Quadruplex RNAs are less well understood than their DNA counterparts, yet of potentially high biological relevance. The interactions of several quadruplex-binding ligands with telomeric RNA quadruplexes ... [more ▼]

Quadruplex RNAs are less well understood than their DNA counterparts, yet of potentially high biological relevance. The interactions of several quadruplex-binding ligands with telomeric RNA quadruplexes are reported and compared with their binding to the analogous DNA quadruplexes. [less ▲]

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See detailUNEXPECTED SOURCE OF CEREBRAL MICROEMBOLISATION INVESTIGATED BY TRANSCRANIAL DOPPLER DUPLEX COLOUR SONOGRAPHY
Sprynger, Muriel ULg

in fascicule du congrès de la BSTH (2009, December 27)

In case of right-to-left shunts, contrast transcranial color-Doppler (cTCD) can complete contrast transœsphageal echocardiiography with a better sensitivity. It is alson a semi-quantitative method. cTCD ... [more ▼]

In case of right-to-left shunts, contrast transcranial color-Doppler (cTCD) can complete contrast transœsphageal echocardiiography with a better sensitivity. It is alson a semi-quantitative method. cTCD can also detect potential micro-emboli in unexpected cerebral areas and/or explain unexpected strokes. [less ▲]

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See detailWeed detection and/or destruction
Piron, Alexis ULg; Destain, Marie-France ULg

Patent (2009)

A method of determining the position of weeds growing in soil amongst crops comprising the steps of:- Using a camera to acquiring a stereoscopic image of plants growing on soil; - Segmentation plant ... [more ▼]

A method of determining the position of weeds growing in soil amongst crops comprising the steps of:- Using a camera to acquiring a stereoscopic image of plants growing on soil; - Segmentation plant pixels and soil pixels; - Creating a modelised height profile of the soil at positions at which soil pixels have not been captured by the stereoscopic image based on information derived from adjacent soil pixels; - Determining a corrected plant height at plant pixels representing the distance between the plant pixel and the modelised soil underneath; - Differentiating between weeds and crops by ciomparing the corrected plant height with an expected crop height. Once the position of a weed has been determined, it may be destroyed, for example by heat applied to the identified position or by a robotic arm. [less ▲]

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See detailHerstellung von neuen strahlenhärtenden bindemitteln
Detrembleur, Christophe ULg; Weikard, Jan; Greszta-Franz, Dorota et al

Patent (2009)

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung neuartiger Bindemittel, die unter Einwirkung aktinischer Strahlung mit ethylenisch ungesättigten Verbindungen unter Polymerisation ... [more ▼]

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung neuartiger Bindemittel, die unter Einwirkung aktinischer Strahlung mit ethylenisch ungesättigten Verbindungen unter Polymerisation reagierende Gruppen und gegebenenfalls auch gegenüber Isocyanaten reaktive Gruppen aufweisen, sowie deren Verwendung in Beschichtungsmitteln. [less ▲]

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See detailÉtude du paysage à travers sa composante bâtie
De Smet, Fabian ULg

in Projets de paysage (2009)

Through various morphological studies, this doctoral research has validated the hypothesis of a typology of constructions set for the description of the built-up component of the suburban landscape. This ... [more ▼]

Through various morphological studies, this doctoral research has validated the hypothesis of a typology of constructions set for the description of the built-up component of the suburban landscape. This article relates the development of this typology. [less ▲]

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See detailLes nanotechnologies, entre l'espoir et les craintes
Thoreau, François ULg

Article for general public (2009)

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See detailA reduction method for noisy Boolean networks
Fourré, Frédéric; Baurain, Denis ULg

E-print/Working paper (2009)

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See detailEtude des propriétés hémato-supportives in vitro des cellules souches mésenchymateuses
Briquet, Alexandra ULg

Doctoral thesis (2009)

Bone marrow (BM) mesenchymal stem cells (MSC) support proliferation and differentiation of hematopoietic progenitor cells (HPC) in vitro. Since they represent a rare subset of BM cells, MSC preparations ... [more ▼]

Bone marrow (BM) mesenchymal stem cells (MSC) support proliferation and differentiation of hematopoietic progenitor cells (HPC) in vitro. Since they represent a rare subset of BM cells, MSC preparations for clinical purposes involves a preparative step of ex vivo multiplication. The aim of our study was to analyze the influence of culture duration on MSC supportive activity. MSC were expanded for up to 10 passages. MSC and CD34+ cells were seeded in cytokinefree co-cultures after which the phenotype, clonogenic capacity and in vivo repopulating activity of harvested hematopoietic cells were assessed. Early passage MSC supported HPC expansion and differentiation toward both B lymphoid and myeloid lineages. Late passage MSC did not support HPC and myeloid cell outgrowth but maintained B cell supportive ability. In vitro maintenance of NOD/SCID mouse repopulating cells cultured for one week in contact with MSC was effective until the fourth MSC passage and declined afterwards. CD34+ cells achieved higher levels of engraftment in NOD/SCID mice when co-injected with early passage MSC; however MSC expanded beyond 9 passages were ineffective in promoting CD34+ cell engraftment. Non-contact cultures indicated that MSC supportive activity involved diffusible factors. Among these, interleukin (IL)-6 and IL-8 contributed to the supportive activity of early passage MSC but not of late passage MSC. MSC phenotype as well as fat, bone and cartilage differentiation capacity did not change during MSC culture. Extended MSC culture alters their supportive ability toward HPC without concomitant changes in phenotype and differentiation capacity. [less ▲]

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See detailLaboratoire et allergologie : nouvelles applications
Gadisseur, Romy ULg; Cavalier, Etienne ULg

Conference (2009, December 17)

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See detailMitral valve dynamics in a closed-loop model of the cardiovascular system
Paeme, Sabine ULg; Chase, J. Geoffrey; Hann, Christopher et al

Poster (2009, December 17)

A cardiovascular and circulatory system (CVS) model has been validated in silico, and in several animal model studies. It accounts for valve dynamics by means of Heaviside function to simulate “open on ... [more ▼]

A cardiovascular and circulatory system (CVS) model has been validated in silico, and in several animal model studies. It accounts for valve dynamics by means of Heaviside function to simulate “open on pressure, close on flow” law. Thus, it does not consider the real time scale of the valve aperture and thus doesn’t fully capture valve dysfunction. This research couples the CVS model with a model describing the progressive aperture of the mitral valve. [less ▲]

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See detailVariation linguistique et signification sociale chez les jeunes Bruxelloises issus de l’immigration maghrébine. Analyse socio-phonétique de trois variantes non standard.
Audrit, Stéphanie ULg

Doctoral thesis (2009)

The present PhD research concerns three non-standard phonetic variants, known as specific to the adolescents from Moroccan immigration, and the meso-social meanings linked to these variants. The meso ... [more ▼]

The present PhD research concerns three non-standard phonetic variants, known as specific to the adolescents from Moroccan immigration, and the meso-social meanings linked to these variants. The meso-social level is defined here as the profiles or social personae (Coupland 2001). My hypothesis is that macro-socially homogeneous speakers use non standard variants according to their belonging to contrasted meso-social profiles. This problem is tackled through the analysis of authentic data, collected during a one-year ethnographic survey inside of two Brussels schools. These schools had a mostly female and immigrated population. Among the two of them, a peer group constituting a community of practice (Eckert 2000, 2005) was chosen as the focus of the study. This ethnographic gathering of data has a double aim: (i) first, it has to allow to determine what the profiles specific to the investigated peer groups are; (ii) secondly, a long-term survey must allow to collect speech as close as possible of the speakers’ vernacular. The three non standard variants are the followings: (i) The reduced vowels: they are strongly reduced vowels that can completely disappear from the sound signal, in very atypical positions according to standard French. (ii) The back /A/: these realisations of /A/ are characterized by the backing of their articulation point, whose consequence is to move their timbre closer to this of /ɔ/ ; (iii) The marked variants of /r/: this large designation includes trill fricatives and fricatives produced with a large amount of noise. Analyzing the meso-social meaning of non standard variants requires a double methodology, both qualitative and quantitative. The qualitative part concerns the analysis of ethnographic data (interviews and fieldwork notes). It leads to the discovery of three contrasted speaker profiles, that is to say the messing-up girls, the provocatives and the modests. In the second part of the analysis, the existence of a link between the different speaker profiles and the use of each of the marked variants was investigated through statistical independence tests (chi square tests). These tests underline that the reduced vowels and the marked variants of /r/ are more used by the messing-up and the provocative girls, that is to say to speaker profiles which distance the traditional Moroccan and Muslim values. At the opposite, the back /A/ seem to have a double face, because they are linked with two very different profiles, the provocatives and the modests. This variant is also often mentioned as characteristic of the lower class language (Jamin 2005). It seems thus that the back /A/ have multiple meanings, whose point in common would be pejoration. If we come back to the initial hypothesis, the use of marked variants thus appears to be linked to the speakers’ belonging to contrasted profiles. However, these profiles are not the only factor to have an influence: the results of the tests show that, jointly to the profiles, the school has also an influence on the use of marked variants. This importance of school was furthermore underlined by several researches in sociology of education, where it is known as the school composition effect (Dumay & Dupriez 2005, 2008). [less ▲]

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See detailSommet de Copenhague: Que veut l’Afrique ?
Ozer, Pierre ULg

Article for general public (2009)

Les pays pauvres sont moins armés pour faire face aux changements climatiques. Ils revendiquent une “justice climatique” avec des mécanismes de compensation. Est-ce juste ? Est-ce trop ? Ils se heurtent ... [more ▼]

Les pays pauvres sont moins armés pour faire face aux changements climatiques. Ils revendiquent une “justice climatique” avec des mécanismes de compensation. Est-ce juste ? Est-ce trop ? Ils se heurtent au mode de vie non négociable des nantis. [less ▲]

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See detailLA STEAM EXPLOSION : PRINCIPE ET ACTION SUR LES MATERIAUX LIGNOCELLULOSIQUES
Jacquet, Nicolas ULg; Blecker, Christophe ULg; Paquot, Michel ULg

Poster (2009, December 16)

La steam explosion est un procédé thermomécanochimique qui va permettre la déstructuration de la matière lignocellulosique par l’action combinée de la chaleur issue de la vapeur, des hydrolyses induites ... [more ▼]

La steam explosion est un procédé thermomécanochimique qui va permettre la déstructuration de la matière lignocellulosique par l’action combinée de la chaleur issue de la vapeur, des hydrolyses induites par la formation d’acides organiques et du cisaillement résultant de la chute brutale de pression. Le procédé est composé de deux phases distinctes. D’une part, le vapocraquage qui consiste à faire pénétrer par diffusion, puis à condenser, la vapeur sous haute pression à l’intérieur de la structure du matériau. L’eau condensée à température élevée va initier l’hydrolyse des groupements acétyles contenus dans les xylanes et induire la formation d’acides organiques. Selon la sévérité des conditions (pression, température), les acides vont catalyser l’hydrolyse des fractions hémicellulosiques, induire des modifications dans la structure des lignines et modifier le degré de cristallinité de la fraction cellulosique. D’autre part, la décompression explosive. Cette phase est provoquée par une chute brutale de pression qui va entraîner la revaporisation d’une partie de l’eau condensée. L’expension brutale de la vapeur va induire des forces de cisaillement qui vont modifier les propriétés physiques (granulométrie, surface spécifique, rétention d’eau…) du matériau. [less ▲]

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See detailAspects nutritionnels des vaches laitières et autonomie alimentaire
Beckers, Yves ULg

Conference given outside the academic context (2009)

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