Coton biologique et / ou équitable en Afrique de l'Ouest : Etat des Lieux
Kouakou, Guy Eric Anicet Quassy
Master of advanced studies dissertation (2004)
The biological cotton and / or fair highlights an environment-friendly agriculture(farming) and guaranteeing better income to the farmers.Detailed reference viewed: 13 (0 ULg)
Le coton dans le monde, place du coton africain et principaux enjeux.
Berti, Fabio ; ; et al
in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2006), 10(4),Detailed reference viewed: 37 (8 ULg)
Le cotoneaster horizontal sur pelouses calcicoles: de l'ornement à la gestion
Piqueray, Julien ; Halford, Mathieu ; Massoz, Aurélie et al
in Parcs & Réserves (2009), 64(4), 23-26Detailed reference viewed: 45 (8 ULg)
Cotoneaster horizontalis on calcareous grasslands in Belgium : from ornament to management
Frisson, Gwenn ; Piqueray, Julien ; Halford, Mathieu et al
Poster (2010, September)
Cotoneaster horizontalis DECAISNE, a Rosaceae coming from Asia, was introduced in Belgium as an ornamental species. Different sides of the invasion were studied, from the distribution of the species and ... [more ▼]
Cotoneaster horizontalis DECAISNE, a Rosaceae coming from Asia, was introduced in Belgium as an ornamental species. Different sides of the invasion were studied, from the distribution of the species and the invasion status, the impacts, to management methods. To describe the invasion status, information was gathered about the occurrence and the distribution of the species in Belgium by compiling various databases. The naturalization status in calcareous grasslands, high-value habitats recognized as biodiversity hotspots, was assessed. Occurrence, population status, preferred habitats, invaded communities, growth rate and fruiting capacity were characterized. Once naturalization established, we investigated its impacts on calcareous grasslands communities, individual species and pollinators. C. horizontalis occurred in seven of the nine studied calcareous grasslands, with densities from 0.34 to 10 individuals/ha. In the most invaded sites, an ongoing colonization process was suggested by a high proportion of small individuals. Moreover, 3-year-old individuals already showed fruiting capacities. Germination rate reached about 30%. Significant impacts on habitat structure and vegetation were showed. Community structure and composition changes were demonstrated in invaded sites by decreasing species richness and diversity. As calcareous grasslands are priority Natura2000 habitats, measures must be taken to control the spread of C. horizontalis. For this purpose, we performed management tests to identify the most efficient techniques that would help the restoration of calcareous grasslands. Both mechanical and chemical management techniques were tested. Methods choice was driven by the environmental constraints of calcareous grasslands, which require highly selective techniques, and by species characteristics. Tested methods were cuttings, stump burning, spraying, cutting plus glyphosate application on stump and glyphosate application on stem basis. Efficiency, cost, feasibility and side-effects on ecosystems were estimated. Management tests are still ongoing but some results have already been drawn: spraying and single cutting are not efficient, the last one generating production of numerous sprouts. Finding the best management method will not be sufficient to stop the invasion. C. horizontalis is still present in 53% of the sale catalogs of horticulturists in Southern Belgium. As long as the species is used in the vicinity of calcareous grasslands, propagules are continuously provided, jeoparding management actions. [less ▲]Detailed reference viewed: 85 (9 ULg)
; ; et al
in Agriculture en Afrique tropicale (2001)Detailed reference viewed: 7 (4 ULg)
Les cotonniers (Gossypium hirsutum L.) génétiquement modifié, Bt : quel avenir pour la petite agriculture familiale en Afrique francophone
; Berti, Fabio
in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2006), 10(4), 335-343
Les cultivars de cotonniers génétiquement modifi és sont aux portes de lʼAfrique francophone après avoir été massivement adoptés en Afrique du Sud. Afi n dʼanticiper les effets des cotonniers Bt sur le ... [more ▼]
Les cultivars de cotonniers génétiquement modifi és sont aux portes de lʼAfrique francophone après avoir été massivement adoptés en Afrique du Sud. Afi n dʼanticiper les effets des cotonniers Bt sur le petit paysannat, nous nous livrons à une analyse simple de la rentabilité de cette culture sur base de résultats obtenus en Afrique du Sud et de données recueillies par des collègues au Mali. Si la commercialisation du cotonnier Bt peut se justifi er clairement sur le plan technique par la crainte dʼune amplifi cation de la résistance des chenilles carpophages aux insecticides, la rentabilité de cette innovation est par contre bien moins certaine. Le profi t réalisé par le paysan dépendra essentiellement du niveau du rendement conditionné par des aléas dʼordre climatique, agronomiques et environnementaux et du prix de la licence technologique à charge du paysan. Pour un prix dʼachat du coton-graine de 210 FCFA, le prix de 25 USD par ha semble être la limite au-delà de laquelle le paysan court un risque fi nancier. Dans le contexte actuel de baisse des prix dʼachat, la contribution fi nancière du paysan à toute redevance technologique est questionnable. Au niveau de lʼensemble de la fi lière, le succès de lʼadoption du cotonnier Bt en Afrique francophone sera probablement fonction de plusieurs éléments : 1) la prévention des résistances à la toxine Bt ; 2) le renforcement du contrôle intégré des insectes piqueurs ; 3) la modernisation du système de production de semences et 4) lʼamélioration du système de vulgarisation et de suivi agricole. Le cotonnier Bt doit être considéré comme un élément du management intégré de la culture et pas comme la solution unique à lʼallègement de la pauvreté. [less ▲]Detailed reference viewed: 14 (3 ULg)
Cotransplantation of mesenchymal stem cells might prevent death from graft-versus-host disease (GVHD) without abrogating graft-versus-tumor effects after HLA-mismatched allogeneic transplantation following nonmyeloablative conditioning.
Baron, Frédéric ; Lechanteur, Chantal ; Willems, Evelyne et al
in Biology of Blood & Marrow Transplantation (2010), 16(6), 838-47
Recent studies have suggested that coinfusion of mesenchymal stem cells (MSCs) the day of hematopoietic cell transplantation (HCT) might promote engraftment and prevent graft-versus-host disease (GVHD ... [more ▼]
Recent studies have suggested that coinfusion of mesenchymal stem cells (MSCs) the day of hematopoietic cell transplantation (HCT) might promote engraftment and prevent graft-versus-host disease (GVHD) after myeloablative allogeneic HCT. This prompted us to investigate in a pilot study whether MSC infusion before HCT could allow nonmyeloablative (NMA) HCT (a transplant strategy based nearly exclusively on graft-versus-tumor effects for tumor eradication) from HLA-mismatched donors to be performed safely. Twenty patients with hematologic malignancies were given MSCs from third party unrelated donors 30-120 minutes before peripheral blood stem cells (PBSCs) from HLA-mismatched unrelated donors, after conditioning with 2 Gy total body irradiation (TBI) and fludarabine. The primary endpoint was safety, defined as a 100-day incidence of nonrelapse mortality (NRM) <35%. One patient had primary graft rejection, whereas the remaining 19 patients had sustained engraftment. The 100-day cumulative incidence of grade II-IV acute GVHD (aGVHD) was 35%, whereas 65% of the patients experienced moderate/severe chronic GVHD (cGVHD). One-year NRM (10%), relapse (30%), overall survival (OS) (80%) and progression-free survival (PFS) (60%), and 1-year incidence of death from GVHD or infection with GVHD (10%) were encouraging. These figures compare favorably with those observed in a historic group of 16 patients given HLA-mismatched PBSCs (but no MSCs) after NMA conditioning, which had a 1-year incidence of NRM of 37% (P = .02), a 1-year incidence of relapse of 25% (NS), a 1-year OS and PFS of 44% (P = .02), and 38% (P = .1), respectively, and a 1-year rate of death from GVHD or infection with GVHD of 31% (P = .04). In conclusion, our data suggest that HLA-mismatched NMA HCT with MSC coinfusion appeared to be safe. [less ▲]Detailed reference viewed: 61 (30 ULg)
Cotrimoxazole induced mixed type II cryoglobulinemia.
Leclercq, Philippe ; Frippiat, Frédéric ; Lambermont, Bernard
in European Journal of Internal Medicine (2008), 19(4),Detailed reference viewed: 34 (8 ULg)
La couche cornée, le point de rosée et l'eau-comme-de-la-glace.
Uhoda, Emmanuelle ; Franchimont, Claudine ; Quatresooz, Pascale et al
in Dermatologie Actualité (2009), 112Detailed reference viewed: 31 (6 ULg)
Couches d'oxydation et patines intentionnelles des bronzes
Book published by Editions universitaires europeennes (2011)
Les couches d'oxydation présentes à la surface des alliages cuivreux d'objets du patrimoine culturel sont très riches d'informations. Elles peuvent renseigner sur l'aspect d'origine de l'objet et sur son ... [more ▼]
Les couches d'oxydation présentes à la surface des alliages cuivreux d'objets du patrimoine culturel sont très riches d'informations. Elles peuvent renseigner sur l'aspect d'origine de l'objet et sur son état de conservation. Elles sont souvent de nature très complexe et leur analyse est très délicate car elle est soumise à des contraintes sévères de préservation. Nous nous sommes intéressés aux couches provenant d'oxydations à haute température et aux patines intentionnelles antiques. L'oxydation à haute température du système cuivre-étain a été étudiée de manière approfondie et nous avons proposé un modèle mettant en évidence le rôle inhibiteur de l'étain. Nous avons également étudié les patines intentionnelles antiques qui sont le résultat de traitements chimiques effectués par l'artisan pour modifier l'aspect et la couleur du matériau métallique. Pour cela nous avons analysé un corpus exceptionnel d'objets de musée. Ces analyses ont permis de réaliser des avancées importantes dans la connaissance de ces objets et de ces techniques, mais aussi dans le domaine de l'histoire des techniques et stylistique dans l'Antiquité méditerranéenne. [less ▲]Detailed reference viewed: 41 (9 ULg)
Les couches de passage du Dévonien au Carbonifère de Hook Head (Ireland) au Bohlen (D.D.R.).
; ; et al
in Streel, Maurice; Wagner, R.H. (Eds.) Colloque sur la Stratigraphie du Carbonifère, Liège 1970 (1971)Detailed reference viewed: 17 (1 ULg)
Could bonobos, Pan paniscus, influence forest re(colonization) in a forest-savana mosaic?
Trolliet, Franck ; Serckx, Adeline ; Huynen, Marie-Claude et al
in Folia Primatologica : International Journal of Primatology = Internationale Zeitschrift für Primatologie = Journal international de Primatologie (2013, September 12)Detailed reference viewed: 41 (21 ULg)
Could current Pericopsis elata (Fabaceae) patches in southeastern Cameroon be reasonably linked to past anthropogenic activities ?
Bourland, Nils ; Cerisier, François ; et al
Poster (2012, March 01)
Pericopsis elata is one of the most valuable African timber species. This IUCN Red Listed tree suffers from a lack of regeneration, thus its current presence provokes questioning. Our work aimed at ... [more ▼]
Pericopsis elata is one of the most valuable African timber species. This IUCN Red Listed tree suffers from a lack of regeneration, thus its current presence provokes questioning. Our work aimed at understanding its origins so as to help securing its future. This study, lead away from engineering works, was conducted in four different sites located within the natural distribution area of the species and took into account the different growing conditions were the species occurs. Our observations were based on an analysis of charcoal elements and pottery fragments discovered in subsurface layers of soils as well as on current botanical and pedological surveys. Discovered evidence of past human activities led to the assumption that this part of the Congo Basin was much more inhabited than previously thought. Some of the results obtained for P. elata could apply for other long lived light demanding species growing in the same environment. [less ▲]Detailed reference viewed: 70 (12 ULg)
Could diffuse modes of failure be analyzed by a material instability condition?
; ; Collin, Frédéric et al
Localized modes of failure are classically analyzed by a plastic strain localization criterion given by the vanishing values of the determinant of the acoustic tensor. However, some failure modes do not ... [more ▼]
Localized modes of failure are classically analyzed by a plastic strain localization criterion given by the vanishing values of the determinant of the acoustic tensor. However, some failure modes do not exhibit any localization pattern and a crucial question appears : what is the proper criterion for diffuse failure ? An answer attempt is proposed in this paper in both frameworks of continuum mechanics and discrete mechanics through the second order work criterion. [less ▲]Detailed reference viewed: 21 (3 ULg)
Could GENIE detect hot Jupiters?
; Absil, Olivier ; et al
in Fridlund, Malcolm; Henning, Thomas (Eds.) Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets (2003, October 01)
The prime objective of GENIE (Ground-based European Nulling Interferometry Experiment) is to obtain experience with the design, construction and operation of an IR nulling interferometer, as a preparation ... [more ▼]
The prime objective of GENIE (Ground-based European Nulling Interferometry Experiment) is to obtain experience with the design, construction and operation of an IR nulling interferometer, as a preparation for the DARWIN/TPF mission. In this context, the detection of a planet orbiting another star would provide an excellent demonstration of nulling interferometry. Doing this through the atmosphere, however, is a formidable task. In this paper we assess the prospects of detecting, with nulling interferometry on ESO's VLT, a Hot Jupiter, a giant planet in a close orbit around its parent star. First we discuss the definition of the optimal target. Then we present a simulated observation of the Tau Bootis system, which suggests that GENIE, in a L'-band single Bracewell configuration, could detect the hot Jupiter in a few hours time with a signal-to-noise ratio of up to ~80. Although there are strong requirements on the control-loop performance, background subtraction and accuracy of the photometry calibration, we conclude that at present there do not seem to be fundamental problems that would prevent GENIE from detecting hot Jupiters. Hence the answer to the question in the title is yes. [less ▲]Detailed reference viewed: 9 (0 ULg)
Could internet use be promising in health prevention and promotion in menopausal women ? A preliminary report
Slomian, Justine ; Streel, Sylvie ; et al
in Osteoporosis International (2014), 25(2), 309Detailed reference viewed: 21 (6 ULg)
Could pulmonary inertance be a limiting factor of ventilation during exercise in the equine species ?
Art, Tatiana ; Lekeux, Pierre ; Gustin, Pascal et al
in Proceedings of the 7th Comparative Respiratory Society Meeting (1988)Detailed reference viewed: 8 (0 ULg)
Could Western blot analysis be an alternative to radio-immunoassay for sheep pregnancy associated glycoproteins measurements ?
; ; et al
in Reproduction in Domestic Animals (2010, September 15), 45(Suppl 3), 65
This study prospected whether Western blot analysis could be an alternative to radio-immunoassay (RIA) for sheep pregnancy diagnosis. Blood samples were taken from Boujaâd ewes (n= 9) and Boujaâd x D’man ... [more ▼]
This study prospected whether Western blot analysis could be an alternative to radio-immunoassay (RIA) for sheep pregnancy diagnosis. Blood samples were taken from Boujaâd ewes (n= 9) and Boujaâd x D’man (BD) cross breed (n= 12). The pregnancy associated glycoproeins (PAGs) were weekly monitored in plasma during the whole gestation and the first month postpartum by two RIA systems (El Amiri et al., 2007, Reprod Domest Anim 42:257-62). The highly immunoreactive samples derived from PAG profiles were tested using Western blot based on the same antiserum used in RIA. Each week (from the 13th to the 19th week), two pools of plasma samples (4 ml each) were taken from single and multiple lambing ewes respectively. Samples were submitted to a protein extraction at neutral pH, followed by ammonium sulfate (A.S.) precipitation, dialysis, and lyophilization. The placental extract was used as a check. Results revealed that ewes with multiple lambs presented numerically higher PAG concentrations. In both RIA systems, the high concentrations were recoded around the 19th week of gestation and the maximal concentrations varied from 120 to 700 ng/ml. In Western blot, the placental extracts reacted positively while the plasma samples did not give any positive reaction. In conclusion, the RIA remains the only sensitive method to measure PAGs in plasma. The present study strengthens the need to develop an ELISA kit as an alternative to RIA systems. [less ▲]Detailed reference viewed: 47 (2 ULg)