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See detailSavoir, lutte et organisation: les étudiants allemands et le Spatkapitalismus
Cavazzini, Andrea ULiege

Scientific conference (2010, January 23)

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See detailStatistical analysis of chamber VOCs emission data
Romain, Anne-Claude ULiege; Degrave, Christophe; Nicolas, Jacques ULiege

Conference (2010, January 21)

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See detailRelation between emission and olfactory tests
Degrave, Christophe; Romain, Anne-Claude ULiege; Nicolas, Jacques ULiege

Conference (2010, January 21)

At present, sensory evaluation is not yet integrated in all labels and standards. After comparison and interpretation of the weaknesses and the strengths of the several existing methods, a methodology has ... [more ▼]

At present, sensory evaluation is not yet integrated in all labels and standards. After comparison and interpretation of the weaknesses and the strengths of the several existing methods, a methodology has been elaborated. Previous experience in off-odour measurements for environmental field investigations help us to propose a methodology based on the assessment of odour intensity and hedonic tone. Various floor covering materials were tested in the lab with a self-made instrument. The sampling procedure is based on a "Field and Laboratory Emission Cell" (FLEC). The odour of the material is compared to a 8-level butanol intensity scale generated through a vaporization chamber and 8 stainless steel capillaries distributing the diluted n-butanol to 8 sniffing ports. First results shows generally a correlation between bad hedonic tone and odour intensity. On the contrary, there are no systematic relations between VOC levels and odour perception. The less odorous materials (PVC) are also the ones with the higher level of total VOC and the linoleum had a strong odour with a low level of total VOC. The explanation lies in the chemical family composition of the emission. The PVC emission contains mainly alkanes compounds (non odorous family) whereas the linoleum contains also odorous chemical families like carboxylic acids and aldehydes. [less ▲]

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See detailExplaining Organisational Diversity in Fair Trade Social Enterprises
Huybrechts, Benjamin ULiege

Doctoral thesis (2010)

This research aims to explain and understand the organisational diversity observed in the field of Fair Trade Social Enterprises or Fair Trade Organisations (FTOs). The transversal hypothesis is that such ... [more ▼]

This research aims to explain and understand the organisational diversity observed in the field of Fair Trade Social Enterprises or Fair Trade Organisations (FTOs). The transversal hypothesis is that such a diversity in organisational forms may be linked to the multidimensional (economic, social and/or political) nature of Fair Trade. First, since there are virtually no typologies focused on FTOs, it is necessary to look at how organisational diversity in FT can be categorised. A typology with five categories of organisational forms is suggested. Secondly, this work explores the reasons behind organisational diversity, using both an external, explanatory perspective, and an internal, interactionist perspective. A third key issue is to explore whether FTOs experience tensions between the different dimensions of FT, and how these tensions are managed in the different types of FTOs. These issues are examined under the light of different theoretical approaches linked to “new institutionalism” (economic, sociological and entrepreneurial) and resource dependence theory. The empirical material is provided by interviews with the leaders of 57 FTOs in four European regions: Belgium, France (Rhône-Alpes), the United Kingdom (England) and Italy (Rome). Eight of these FTOs, reflecting the different categories of organisational forms, are analysed more in depth. [less ▲]

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See detail« Traduire ou ne pas traduire » : un dilemme bien connu des auteurs grecs et latins
Rochette, Bruno ULiege

Scientific conference (2010, January 20)

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See detailMolecular Polymorphisms in Tunisian Pomegranate (Punica granatum L.) as Revealed by RAPD Fingerprints
Hasnaoui, Nejib ULiege; Mars, Messaoud; Chibani, Jemni et al

in Diversity (2010), 2(1), 107-114

The genetic diversity among Tunisian pomegranate cultivars has been investigated. Using universal primers, the random amplified polymorphic DNA (RAPD) method was used to generate banding profiles from a ... [more ▼]

The genetic diversity among Tunisian pomegranate cultivars has been investigated. Using universal primers, the random amplified polymorphic DNA (RAPD) method was used to generate banding profiles from a set of twelve cultivars. Data was then computed with appropriate programs to construct a dendrogram illustrating the relationships between the studied cultivars. Our data proved the efficiency of the designed method to examine the DNA polymorphism in this crop since the tested primers are characterized by a collective resolving power of 12.83. In addition, the cluster analysis has exhibited a parsimonious tree branching independent from the geographic origin of the cultivars. In spite of the relatively low number of primers and cultivars, RAPD constitutes an appropriate procedure to assess the genetic diversity and to survey the phylogenetic relationships in this crop. [less ▲]

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See detailSupply chain vs marketing
Nondonfaz, Robert ULiege; Arda, Yasemin ULiege; Limbourg, Sabine ULiege

Article for general public (2010)

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See detailLe développement de la fonction narrative chez l'enfant et l'adolescent
Boulard, Aurore ULiege

Scientific conference (2010, January 16)

L’étude de l’utilisation des pronoms personnels s’inscrit dans une recherche plus large sur la fonction narrative autobiographique chez des enfants de 2 ans et demi à 10 ans. Les recherches récentes sur ... [more ▼]

L’étude de l’utilisation des pronoms personnels s’inscrit dans une recherche plus large sur la fonction narrative autobiographique chez des enfants de 2 ans et demi à 10 ans. Les recherches récentes sur le développement de la conscience de soi chez l’enfant grâce à l’analyse du discours narratif sont intéressantes à plus d’un titre et nous permettent de poser des hypothèses sur la manière dont l’enfant construit sa capacité à raconter des évènements, à les structurer dans le temps afin d’en faire un récit cohérent. [less ▲]

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See detailIdentification of cyclooxygenase-2 as a major actor of the transcriptomic adaptation of endothelial and tumor cells to cyclic hypoxia: effect on angiogenesis and metastases.
Daneau; Boidot; MARTINIVE, Philippe ULiege et al

in Clinical Cancer Research : An Official Journal of the American Association for Cancer Research (2010), 16(2), 410-419

Purpose: Cyclic hypoxia in tumors originates from heterogeneities in RBC flux and influences not only tumor cells but also endothelial cells lining tumor blood vessels. Whether pO2 fluctuations ... [more ▼]

Purpose: Cyclic hypoxia in tumors originates from heterogeneities in RBC flux and influences not only tumor cells but also endothelial cells lining tumor blood vessels. Whether pO2 fluctuations, particularly transient reoxygenation periods, alter the well-known hypoxia-inducible factor (HIF)–dependent gene program is largely unknown. Experimental Design: We compared the transcriptomic profiles of endothelial and tumor cells exposed to cyclic hypoxia versus continuous hypoxia to uncover a possible differential effect on angiogenesis and metastases. Results: Microarray analyses identified early genes that were selectively induced by cyclic hypoxia in endothelial cells. Among them, we focused on PTGS2 because the observed increase in mRNA expression led to a significant increase in the expression and activity of cyclooxygenase-2 (COX-2; the protein product of PTGS2). HIF-1α was shown to be stabilized by cyclic hypoxia (despite reoxygenation periods) and to favor COX-2 induction as validated by the use of echinomycin and HIF-1α targeting small interfering RNA. Using a specific COX-2 inhibitor and a dedicated COX-2 targeting small interfering RNA, we documented that COX-2 accounted for the higher endothelial cell survival and angiogenic potential conferred by cyclic hypoxia. Cyclic hypoxia also led to a preferential COX-2 induction in tumor cells and, contrary to continuous hypoxia, fostered a higher metastatic take of prechallenged tumor cells. Conclusions: Our study documents that PTGS2/COX-2 is part of a cyclic hypoxia gene signature and largely accounts for the unique phenotype of endothelial and tumor cells exposed to fluctuations in pO2, thereby offering new perspectives for the clustering of tumors expressing COX-2 together with other cyclic hypoxia-responsive genes. Clin Cancer Res; 16(2); 410–9 [less ▲]

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See detailEL Commons : portail collaboratif par et pour les utilisateurs des produits Ex Libris
Renaville, François ULiege

Conference given outside the academic context (2010)

Créée en 2007, le portail EL Commons est né de la volonté de rassembler des développements locaux, des extensions créées par des clients liés à des composants open source des logiciels commerciaux d'Ex ... [more ▼]

Créée en 2007, le portail EL Commons est né de la volonté de rassembler des développements locaux, des extensions créées par des clients liés à des composants open source des logiciels commerciaux d'Ex Libris. La présentation décrit les deux plates-formes (Wiki et CodeShare), présente quelques contenus et statistiques d'utilisation. [less ▲]

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See detailPARATHORMONE DETERMINATION IN THE CLINICAL LABORATORY: BIOCHEMICAL, CLINICAL AND ANALYTICAL ASPECTS
Cavalier, Etienne ULiege

Doctoral thesis (2010)

The aim of our work was to provide comprehensive data to the study of the Parathyroid hormone (Parathormone, or PTH). In the first part of the manuscript, we studied the “laboratory” aspects of PTH ... [more ▼]

The aim of our work was to provide comprehensive data to the study of the Parathyroid hormone (Parathormone, or PTH). In the first part of the manuscript, we studied the “laboratory” aspects of PTH determination. We thus studied the stability of the peptide when stored at different temperatures (pre-analytical phase). From an analytical point of view, we compared different methods for PTH determination and the impact of any change in PTH determination on the follow-up of the hemodialyzed patients. We also studied some analytical interferences and provided a validation strategy that takes into consideration these interferences. Finally, for the post-analytical phase, we established the reference range of PTH with two different methods. We provided guidelines on the way to establish this reference range and studied the clinical impact of applying these reference ranges in the daily routine. The second part of the manuscript is more dedicated to the “clinical” aspects of PTH determination. We thus focused on the problems encountered when determining PTH in CKD and hemodialyzed patients. We also studied different bone markers in these patients to see if one of them could, in the future, replace PTH for the follow-up of these patients. Finally, we studied the “amino-PTH”, a newly discovered form of PTH, in a large population of patients suffering from parathyroid cancer. We thus presented the PTH ratio as a potential marker of parathyroid carcinoma. [less ▲]

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See detailTEST AND EVALUATION OF TWO PROCESS CONTROL STRATEGIES FOR ADAPTING DIRECT INJECTION PESTICIDE APPLICATION TO SMALL SCALE FARMS
El Aissaoui, Abdellah ULiege; Lebeau, Frédéric ULiege; Destain, Marie-France ULiege et al

Conference (2010, January 13)

Small scale farmers, in developing and in some developed countries, are faced to actual difficulties of applying pesticides accurately and safely on vegetables crops. They mainly use hand operated ... [more ▼]

Small scale farmers, in developing and in some developed countries, are faced to actual difficulties of applying pesticides accurately and safely on vegetables crops. They mainly use hand operated sprayers. As an issue, a small direct injection system based on a five meter's parallel boom layout was designed to improve chemical application. The boom layout was optimised to obtain the same minimal lag time response for the ten nozzles. The dynamic of the system was modelled using SimulinkTM as first order model with delay. Two control strategies were implemented using PID feedback control loops to monitor tracer injection (fluorescing) proportionally to simulated forward speed (from 0.6 to 1.2 m/s) and to control the constant operating pressure (constant carrier flow strategy) or the variable operating pressure proportionally to the injected chemical amount (variable total flow strategy). Different forward speed changes were induced using steps up and down, ramps, sine waves and sweeps solicitations to evaluate the control feedback. The system stability was tested for its ability to maintain the expected concentration and application rate. The results show that the lag time remains less than 3 s (dead time < 2s , time constant < 1s) and the system keeps stable for the maximal speed variation and acceleration tested (∆V=200%, a= 0.48 m/s2) which induce less than 10% variation of application rate. [less ▲]

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See detailCan an Electronic Nose Assess the Biomethanation Process?
Adam, Gilles ULiege; Nicolas, Jacques ULiege

Poster (2010, January 12)

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See detailModelling total soil respiration in agricultural soils.
Buysse, Pauline ULiege; Goffin, Stéphanie; Carnol, Monique ULiege et al

Poster (2010, January 12)

Soil respiration is a process which results in CO2 release from the soil to the atmosphere. It comprises two main components. The first one is heterotrophic respiration: CO2 is produced by soil ... [more ▼]

Soil respiration is a process which results in CO2 release from the soil to the atmosphere. It comprises two main components. The first one is heterotrophic respiration: CO2 is produced by soil microorganisms while decomposing the substrate. The second one is autotrophic respiration in which CO2 originates from roots and rhizospheric organisms. All the CO2 is then transported to the surface by diffusion (see Goffin et al., this session). Many biotic and abiotic factors play a role in soil respiration, making this process complex to analyze and understand. Temperature often appears as the most important driving variable. Besides that, interest in the future CO2 emissions from agricultural soils has been growing. Indeed, these ecosystems are a major concern from environmental, economic and social points of view. In particular, the choice of cultural practices and residue management techniques has a strong influence on CO2 emissions from agricultural systems. This work aims at getting to a better understanding of soil respiration in agricultural soils. To reach this goal, many semi-mechanistic models have been previously developed at very different spatio-temporal scales. We intend to adapt such an existing model to crop soils, within a spatial scale of a cultivated field and an annual temporal scale. The model will be validated by using flux measurements carried out at three different crop sites situated in the Hesbaye region in Belgium (Lonzée) and in the South West of France (Lamasquère, Auradé). The study was focused first on soil heterotrophic respiration. Within this part, short term sensitivity of this component to temperature was studied by means of a laboratory incubation experiment. This one was performed with soil samples taken at the Lonzée site. Among the many interesting results we got, it showed a clear sensitivity of soil heterotrophic respiration to short term temperature changes. In parallel, the soil heterotrophic model was calibrated on soil chamber measurements taken at the Lonzée site (Belgium). Next steps in this part of the work will be to calibrate the model using the data from the French sites, and finally to validate the model on the three sites. Afterwards, an autotrophic respiration submodel will be implemented and the results compared to field measurements carried out at the three sites. A further development could consist in simulating agricultural practices to take their impacts on CO2 emissions from crops into account. [less ▲]

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See detailRemote sensing assessement of irrigated areas extension in the Kou watershed
Traore, Farid ULiege; Tychon, Bernard ULiege

Scientific conference (2010, January 12)

The Kou watershed is a geographical space having important water resources, whose are used between: drinking water supply of Bobo-Dioulasso city (Burkina-Faso’s second most important city) and surrounding ... [more ▼]

The Kou watershed is a geographical space having important water resources, whose are used between: drinking water supply of Bobo-Dioulasso city (Burkina-Faso’s second most important city) and surrounding localities; agriculture through very important irrigated surfaces; industry; fauna and flora preservation, through a minimal sanitary debit guaranteed. Since some decades, one observes more and more increased pressure on Kou water resources. From an agricultural point of view, a comparative visual observation of irrigated surfaces during the years 1980 and during years 2000 shows an increase of surfaces. It would be then appropriate to establish a potential of irrigation of the set of available water resources in order to estimate maximal irrigable surfaces by water resources. Thus, this study has for goal the evaluation of Kou watershed irrigated zones surface, with the help of remote sensing. In order to facilitate irrigated zones detection, the study will focused on the period between January and June, where all cultures are irrigated with Kou watershed surface water and/or groundwater. The chosen methodology is images classification in order to extract irrigated zones surface. We had for this study a set of images and various data: Landsat-4 TM, Landsat-5 TM, Landsat-7 ETM+, SPOT 5, aerial views, agro meteorological data, cartographic data (GIS), data investigation reports, etc. Because of images various origins, we conducted images pretreatment that essentially consisted in image reflectance calibration. This operation appears to be indispensable when working with images from coming different sensors. Classification methods that we used are: a maximum likelihood classification, then a decision tree classification applied to images for which vegetation index (NDVI) has been calculated. The later classification method has been introduced in order to permit a better discrimination between natural vegetation and crops which can often react in similar spectral ranges. This method is based on threshold detection of vegetation classes. Classification methods used allowed us to estimate until a certain point irrigated surfaces, without having, however, a finer information. With 30 m spatial resolution images covering a survey zone with "reduced" to "mean" agricultural lands size, it is sometimes enough difficult to discern natural vegetation pixels from crop pixels. So, we should have considered mixed classes of pixels that strongly skewed our final results. The overall accuracy of our classifications are between 70% and 90%, with Kappa coefficients between 0.4 and 0.85. These Kappa coefficients our results between "tolerable" and "good". However, our evaluations seem to be near enough of those gotten by the means of hydro agricultural inventories led on the same zone. The committed mistakes remain in an interval of +/-20%. [less ▲]

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