References of "2012"
     in
Bookmark and Share    
See detailmigrations congolaises en Belgique et géographies religieuses
Demart, Sarah ULg; Melice, Anne ULg; Meiers, Bénédicte ULg

Conference (2012, February 08)

Detailed reference viewed: 8 (1 ULg)
See detail50 Years of contrasted residue management in an agricultural crop: Impacts on the soil carbon budget and on soil heterotrophic respiration.
Buysse, Pauline ULg; Roisin, Christian; Aubinet, Marc ULg

Conference (2012, February 08)

Within the context of Climate Change, crop management exerts a strong influence on the soil carbon (C) balance. This study aims (1) to estimate the C loss by soil heterotrophic respiration (SHR) in ... [more ▼]

Within the context of Climate Change, crop management exerts a strong influence on the soil carbon (C) balance. This study aims (1) to estimate the C loss by soil heterotrophic respiration (SHR) in different residue management treatments through the establishment of their soil C budgets and (2) to compare these estimations with field SHR measurements. Three contrasted treatments were considered: Residue Export (RE), Farm Yard Manure addition (FYM) and Residue Restitution after harvest (RR). They were established in 1959 and continuously applied since then at an experimental field located in the Hesbaye region in Belgium. The soil C budget was calculated for each treatment on the basis of total soil organic C content measurements and C input data compiled since the beginning of the experiment. This allowed estimating the C loss by SHR in the different treatments. SHR measurements were performed in 2010 and 2011 to compare them with the budget-based estimations and to assess SHR sensitivity to temperature in the different treatments. The soil C budgets showed that the soil under the RR treatment was likely to undergo the largest C loss by SHR since the beginning of the experiment. The comparison between the results from the C budget and the SHR field measurements, performed 50 years after the experiment had begun, did however show that the treatment that received the largest amount of crop residues (RR) did not necessarily sequestrate the most C or produce the largest CO2 fluxes (FYM). Besides, no significant difference between treatments was observed in the field measurements in terms of SHR sensitivity to temperature. Laboratory investigations (microbial biomass, basal respiration, metabolic diversity and soil fractionation) will later be performed to better understand the effects of long-term residue management on soil C dynamics. [less ▲]

Detailed reference viewed: 51 (3 ULg)
Full Text
Peer Reviewed
See detailCerebrospinal Fluid Collection Tubes: a critical issue for Alzheimer Disease diagnosis
Perret-Liaudet, Armand; Pelpel, Mathieu; Tholance, Yannick et al

in Clinical Chemistry (2012), 58

Detailed reference viewed: 26 (3 ULg)
Full Text
See detailRelevance of pedotopographical indicators in the assessment of spatial distribution of soil water resources under forest stands. General Methodology.
Ridremont, François ULg; Claessens, Hugues ULg

Poster (2012, February 08)

Water resources constitute one of the most decisive factors of the adaptation of forest ecosystems facing climate changes. The assessment of soil water resources should lead a better understanding of ... [more ▼]

Water resources constitute one of the most decisive factors of the adaptation of forest ecosystems facing climate changes. The assessment of soil water resources should lead a better understanding of forest sites vulnerability to water stress and provide appropriate management recommendations for the choice of trees species and sylvicutlural techniques. This study aims to confront mapping pedotopographical indicators related to the water resource richness of forest sites to the soil moisture regime. The effect of soil moisture on the forest ecosystem productivity and the bioindicator expression of flora will be study too. [less ▲]

Detailed reference viewed: 31 (10 ULg)
Full Text
See detailEsthétique matérielle, philosophie de l'histoire et barbarie
Hagelstein, Maud ULg

Scientific conference (2012, February 08)

Detailed reference viewed: 24 (3 ULg)
Full Text
See detailActualités du droit des marchés publics : les options et les variantes
Durviaux, Ann-Lawrence ULg

Conference given outside the academic context (2012)

Detailed reference viewed: 318 (12 ULg)
See detailRole of western lowland gorilla (Gorilla gorilla gorilla Savage & Wyman, 1847) on the dynamics of tropical logged forest ecosystems
Haurez, Barbara ULg; Petre, Charles-Albert ULg; Doucet, Jean-Louis ULg

Poster (2012, February 08)

The western lowland gorilla (Gorilla gorilla gorilla Savage & Wyman) (WLG) which is considered as a critically endangered species by IUCN, could play a fundamental function in seeds dispersal of several ... [more ▼]

The western lowland gorilla (Gorilla gorilla gorilla Savage & Wyman) (WLG) which is considered as a critically endangered species by IUCN, could play a fundamental function in seeds dispersal of several plant species. This could be related to its frugivorous diet, its stomach capacity and the long gut retention time of the ingested food, its extensive daily path length, and its ability to swallow seeds of variable sizes. In addition, this animal tends to deposit most of ingested seeds in suitable habitats (especially logging gaps and old logging roads) for light-demanding plant development. This research will be conducted within the moist evergreen forest of Central Gabon in a logging concession granted to the company CEB Precious Woods. A preliminary study was undertaken as a Master thesis. It was aiming at obtaining a first insight of interactions between WLG and timber exploitation in Central Gabon and at assessing the extent to which they may benefit of each other. WLG abundances were estimated in unlogged and logged sites in the concession, and nesting behavior described. Seeds dispersed during the study period (February-May) by WLG were identified through fecal analysis. Relatively high WLG abundances were observed in the concession. WLG were found to nest preferentially in open areas and to frequently use old logging road network for nesting and feeding. Sixteen species were observed to be dispersed by WLG. Seeds of the most abundant species, Santiria trimera, were subjected to four treatments: (1) passed seeds, (2) passed seeds in fecal matrix, (3) seeds surrounded by fresh pulp and (3) seeds extracted from fresh fruits. The germination successes of S. trimera were significantly higher after gut passage partly thanks to fruit pulp removal. Our PhD study aims to characterize the functional ecology of WLG in tropical forests dynamics, especially regarding logging biotopes. Our research will be organized in three parts: (1) the survey of gorilla populations in the study area coupled with the characterization of their nests and habitats, (2) the study of dispersed species and of the effect of passage through gorilla gut on seed germination, (3) the estimate of dispersal distances for the species Santiria trimera (Burseraceae) by using molecular markers. Data for the second and third parts will be collected in one site selected thanks to the results of the survey for its high gorilla density, to assess the following assumptions: (1) gorillas favor the regeneration of many plant species, including timber trees; (2) they improve the genetic diversity and limit the genetic structure by widening the genetic pool and dispersing diasporas on large distances. If these hypotheses are accepted, sylvicultural practices may be adapted so as to take advantage from the presence of gorilla population. [less ▲]

Detailed reference viewed: 87 (7 ULg)
Full Text
See detailImpact of cultivation practices on soil respiration
Dufranne, Delphine ULg; Vancutsem, Françoise ULg; Bodson, Bernard ULg et al

Poster (2012, February 08)

In addition to its, evident, food supply function, agriculture is subjected to various pressures and has to respond to many challenges like reducing its CO2 emissions, maintaining or improving the soil ... [more ▼]

In addition to its, evident, food supply function, agriculture is subjected to various pressures and has to respond to many challenges like reducing its CO2 emissions, maintaining or improving the soil quality, maintaining productivity, sequestrating of the carbon stock in soil... Cultivation practices are known to induce a modification of soil organic matter quantity, quality and spatial distribution, which may impact dry matter decomposition kinetics. In order to bring answers to these questions, a multidisciplinary project (SOLRESIDUS) was set up by the University of Liege, Gembloux Agro-Bio Tech in collaboration with Walloon Agricultural Research Centre (CRA-W). The aim was to investigate the impact of cultivation practices (tillage and residue restitution) on crop growth, yield and environment, as well as on soil properties and on activities. In the present study, we focused on the impacts on soil CO2 fluxes. The experimental site is situated in Gembloux, in the Belgian loamy region. The plot is divided into 4 latin squares where two tillage modalities (plough after 2 stubble breaking vs only 2 stubble breaking) and two straw management practices (restitution vs. exportation) were compared. For 3 years, soil respiration was measured with automatic and manual dynamic soil chambers. Moreover, soil respiration was measured as well in cropping zone (total respiration) as in root exclusion zones created with root exclusion cylinders (heterotrophic respiration). As first results, we observed: -a significantly higher flux in plots with residue restitution, which is clearly explained by the larger amount of organic carbon prone to decomposition; -a decrease of standardized heterotrophic respiration (linked with residue decomposition) during growing seasons; -no significant differences in soil respiration between tillage modalities after 3 growing seasons. The experiment is still in progress, more years being necessary in order to evaluate the long-term impacts of cultivation practices on soil respiration. [less ▲]

Detailed reference viewed: 56 (8 ULg)
Full Text
See detailOxford Centre for Evidence‐Based Medicine 2011 Levels of Evidence ‐ Traduction française
OCEBM Levels of Evidence Working Group; Durieux, Nancy ULg; Pasleau, Françoise ULg et al

E-print/Working paper (2012)

Detailed reference viewed: 510 (13 ULg)
Full Text
Peer Reviewed
See detailDesign of a biofilm reactor comprising a metal structured packing for the production of lipopeptides by B. subtilis
Zune, Quentin ULg; Ongena, Marc ULg; Toye, Dominique ULg et al

Poster (2012, February 08)

Abstract : The design of a new single species biofilm bioreactor has been investigated. Bacillus subtilis S499 has been chosen as a model organism for the production of lipopetides. Nevertheless ... [more ▼]

Abstract : The design of a new single species biofilm bioreactor has been investigated. Bacillus subtilis S499 has been chosen as a model organism for the production of lipopetides. Nevertheless, considering the surface active properties for this kind of metabolite, processes based on submerged culture in stirred-tank bioreactor involve the use of important amount of antifoam and therefore downstream processes are tedious. In this work, an original process was developed with an experimental setting leading to the suppression of foam formation during the culture. B. subtilis S499 makes a biofilm on a stainless steel structured packing in the top of a bioreactor, nutrient and oxygen supply being carried out by the media recirculation as liquid film on the packing. Lipopeptides secreted by biofilm are accumulated in the liquid phase under the packing and can reach concentrations as high as 800 mg/l. The colonization of the packing by the biofilm has been monitored by X-ray tomography. [less ▲]

Detailed reference viewed: 92 (24 ULg)
Full Text
See detailDiurnal CO2 flux responses in cultivated savanna in Benin (West Africa)
Ago, Expédit Evariste ULg; Agbossou, Euloge Kossi; Galle, Sylvie et al

Scientific conference (2012, February 08)

Detailed reference viewed: 84 (7 ULg)
Full Text
Peer Reviewed
See detailInfluence de l'apport de différentes sources lipidiques en fin de gestation sur les résultats techniques des truies allaitantes et de leurs porcelets
Boudry, Christelle ULg; Vanrobays, Marie-Laure ULg; Devos, Sven

in IFIP; INRA (Eds.) 44èmes journées de la Recherche Porcine (2012, February 08)

From day 103 in gestation until farrowing, 4 successive groups of 15 sows received 70 g per day of one of the 3 following oils: 1) coconut oil (CO); 2) fish oil (FO) and 3) shark liver oil (SO). At day ... [more ▼]

From day 103 in gestation until farrowing, 4 successive groups of 15 sows received 70 g per day of one of the 3 following oils: 1) coconut oil (CO); 2) fish oil (FO) and 3) shark liver oil (SO). At day 102 of gestation, at farrowing and at weaning, backfat thickness of the sows was determined. The total number of piglets, the number of piglets born alive, stillborn and dead during the suckling period and the duration of gestation were measured. At birth as well as 24 hours, 14 days and 28 days (weaning) later, the piglets were weighed individually. Colostrum samples were collected at farrowing and 24 hours later for the determination of IgG and IgA contents and the fatty acid profile. Neither performance parameters of the sows nor IgG and IgA concentrations in colostrum were affected by the different dietary treatments. This was probably due to the short duration of trial period in which the oil supplements were administered. However, the colostral fatty acid profiles reflected very well the profiles of the supplemented oils. Furthermore, the different treatments affected the growth performances of the piglets. At weaning, the piglets from the FO treatment were respectively 263 and 329 g heavier than the piglets from the SO and CO treatments (P < 0.05). This corresponded to 4.2 % and 5.8 % increase of the ADG in comparison to the SO and CO treatments, respectively. These results show the importance of the fatty acid composition in colostrum on the performances of piglets and consequently the importance of the feeding of sows at the end of gestation. [less ▲]

Detailed reference viewed: 75 (12 ULg)
See detailActualités du droit des marchés publics
Durviaux, Ann-Lawrence ULg

Conference given outside the academic context (2012)

Detailed reference viewed: 31 (6 ULg)
Full Text
See detailEnergetic systems evaluation using Life Cycle Assessment
Belboom, Sandra ULg; Léonard, Angélique ULg

Scientific conference (2012, February 08)

Detailed reference viewed: 38 (10 ULg)
Full Text
Peer Reviewed
See detailCooccurrences des personnes dans le discours de l'enfant: une approche statistique de la construction de l'identité
Poudat, Céline; Gauthier, Jean-Marie ULg; Boulard, Aurore ULg

Conference (2012, February 08)

L’acquisition de la représentation du temps nous donne, avec le développement du langage, accès à la narrativité. Ces histoires que nous racontons aux enfants leur permettent d’accéder au monde de la ... [more ▼]

L’acquisition de la représentation du temps nous donne, avec le développement du langage, accès à la narrativité. Ces histoires que nous racontons aux enfants leur permettent d’accéder au monde de la signification. Peu à peu l’enfant s’approprie sa propre histoire en même temps qu’il constitue son identité. Le concept de self narrative (Denett, 1991), matérialisé dans le discours par l’utilisation des pronoms personnels, est un premier produit de cette évolution. Il est donc intéressant de connaître la manière dont se construit ce récit qui deviendra autobiographique à l’adolescence. [less ▲]

Detailed reference viewed: 62 (14 ULg)
Full Text
See detailContribution to the study of physicochemical and functional properties of hemicelluloses and xylooligosaccharides (XOS) extracted from rapeseed meal
Mertens, Cécile ULg; Paquot, Michel ULg; Destain, Jacqueline ULg et al

Poster (2012, February 08)

Rapeseed meal is one of the main industrial co-products from agriculture in Belgium, with more than 30 000 T produced each year. Beside its agricultural and energetic applications, new paths of ... [more ▼]

Rapeseed meal is one of the main industrial co-products from agriculture in Belgium, with more than 30 000 T produced each year. Beside its agricultural and energetic applications, new paths of valorization are being developed in order to add value to the rapeseed meal, usually by extraction of interesting molecules. In this thesis project, the aimed molecules are hemicelluloses, which are obtained via a global fractionation method that is being developed and optimized, constituting the first part of this project. Indeed, while rapeseed meals are globally already well exploited (mainly for their feed value), rapeseed hemicelluloses have not yet been studied for food application. Yet, hemicelluloses can be used as food additives (thickener, stabilizer, etc) mainly in bakery products. The literature being incomplete regarding the chemical structure of rapeseed hemicelluloses, one of the objectives of this project is to study their physicochemical properties, in regard with their technofunctional properties. Rapeseed hemicelluloses can also be used as raw material to produce an emergent type of prebiotic: xylooligosaccharides (XOS). These molecules can be introduced as well in the food supplement sector. Their production will be achieved by enzymatic hydrolysis, for a polymerization degree between two and five. Thus, the production and the physicochemical and technofunctional characterization of rapeseed XOS constitute the last objective of this project. This thesis is part of the SYNBIOFOR project, which aim is to create new symbiotic ingredients. [less ▲]

Detailed reference viewed: 78 (22 ULg)
Full Text
See detailStudy of pesticide retention on leaves using high-speed imaging
Massinon, Mathieu ULg; Lebeau, Frédéric ULg

Poster (2012, February 08)

Detailed reference viewed: 38 (17 ULg)