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See detailEffets d'une immunomodulation de la leptine et de la cholécystokinine chez le rat en croissance
Colinet, Frédéric ULg

Master's dissertation (2001)

The use of antibodies to modulate the activity of existing endocrine factors is an immunomodulation. The meal-related intestinal signal cholecystokinin (CCK) and the adipose tissue-produced leptin are ... [more ▼]

The use of antibodies to modulate the activity of existing endocrine factors is an immunomodulation. The meal-related intestinal signal cholecystokinin (CCK) and the adipose tissue-produced leptin are known as satiety hormones. Their interaction induces long- and short-terms effects. The aim of this study is to examine the zootechnical and endocrinal effects of an active immunomodulation of both CCK and leptin. Three experiments are realized. Two of them are single or double active immunization of rats against the cholecystokinin 33 (CCK-33), the unsulfated cholecystokinin octapeptide (CCK- 8ns) and the leptin. The last experiment consists in injecting leptin and CCK-8ns into immunized rats. More than 60 % of the concerned rats are really immunized against CCK-33 or CCK-8ns. Few rats develop antibodies against leptin. Very few rats respond to the double immunization against CCK and leptin. In the first experiment, the immunomodulation of CCK-8ns reduces food intake and growth. The leptin-immunized rats eat the most (P < 0.05). The second experiment shows that the immunomodulation of CCK-8ns stimulates growth by 8 % in the second part of the experiment. In both experiments, all the leptin-treated rats have a smaller feed efficiency than the control group during the second week (P < 0.05). The feed efficiency of the control group is the highest until the fourth week. We don’t observe any difference in weight lost between control rats, which get leptin and CCK-8ns injections, and control rats with saline solution injections. Rats which develop CCK-8ns antibodies and get leptin and CCK-8ns injections lose more weight than rats that develop these antibodies and get saline solution injections (P < 0.03). The endocrinal parameters of the second experiment show that leptin-immunized rats have more serum leptin than the control group (P < 0.03). We note more serum IGFBP-3 in CCK-8ns- and leptin-immunized rats than the others (P < 0.001) and less T3 and T4 in their bloodstream (respectively P < 0.004 and P < 0.002). In conclusion, the small immune response against leptin had to limit the zootechnical and endocrinal effects. New techniques must be developed in order to generate a better immune response essentially against leptin. [less ▲]

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See detailLes effets d'une supplémentation en vitamine D sur la fonction musculaire
Beaudart, Charlotte ULg; Reginster, Jean-Yves ULg; Cavalier, Etienne ULg et al

in Ortho-Rhumato (2014), 12(5), 33-37

Au-delà de ses rôles classiques sur la santé osseuse, il y a de plus en plus de raisons de penser que la vitamine D aurait également des actions non négligeables sur les tissus extra-squelettiques tels ... [more ▼]

Au-delà de ses rôles classiques sur la santé osseuse, il y a de plus en plus de raisons de penser que la vitamine D aurait également des actions non négligeables sur les tissus extra-squelettiques tels que les muscles. En effet, plusieurs enquêtes épidémiologiques suggèrent une association transversale entre un faible taux sérique de 25-hydroxy-vitamine D (25[OH]D) et une faiblesse musculaire, tant au niveau de la masse musculaire que de la force musculaire. Suite à ces constatations, plusieurs équipes de recherche ont décidé d’évaluer le potentiel thérapeutique de la vitamine D en mesurant les effets d’une supplémentation en vitamine D sur la force musculaire, la masse musculaire, mais également la puissance musculaire. En raison principalement de l’hétérogénéité très importante des différents protocoles de supplémentation, tant au niveau du type de population ciblée que de la dose de vitamine D, du mode d’administration ou encore de la durée de l’étude, les conclusions de ces études restent controversées. Très récemment, notre équipe de recherche a publié une méta-analyse visant à combiner les résultats de l’ensemble de ces études afin de synthétiser les effets de cette supplémentation en vitamine D sur la fonction musculaire. Les résultats, combinant 30 études randomisées contrôlées, tendent à montrer que la vitamine D améliorerait de manière faible mais significative la force musculaire, en particulier la force des membres inférieurs. Aucun effet sur la masse et la puissance musculaires n’a toutefois été démontré. Cette recherche pose l’hypothèse d’un intérêt thérapeutique de la vitamine D dans le domaine des pathologies musculosquelettiques, de plus en plus présentes dans nos populations vieillissantes. [less ▲]

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See detailLes effets d'une supplémentation en vitamine D sur la force musculaire : une méta-analyse d'essais randomisés contrôlés
Beaudart, Charlotte ULg; Buckinx, Fanny ULg; Rabenda, Véronique ULg et al

in Cahiers de l'Année Gérontologique (Les) (2013, September), 5(1-2), 38

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See detailEffets de compétition dans les essais variétaux de plein-champ
Claustriaux, Jean-Jacques ULg

in Effets de compétitions dans les essais variétaux de plein-champ (1997)

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See detailEffets de deux associations culturales à base de blé sur les populations de pucerons (Homoptera: Aphididae) et d’auxiliaires aphidiphages: étude préliminaire menée en Chine
Chevalier Mendes Lopes, Thomas ULg; Bosquée, Emilie ULg; Honba, David et al

in Entomologie Faunistique = Faunistic Entomology (2014), 67

Crop associations have several advantages when plant species and crop production methods, including harvesting, are well selected. This preliminary study was conducted in the Shandong province (China) to ... [more ▼]

Crop associations have several advantages when plant species and crop production methods, including harvesting, are well selected. This preliminary study was conducted in the Shandong province (China) to better characterize the effect of wheat (Triticum aestivum L.)/oilseed rape (Brassica napus L.) and wheat/pea (Pisum sativum L.) associations on the aphid and aphidophagous beneficial populations. Aphids observed on wheat tillers were significantly more abundant in the pure stand of wheat during the two weeks prior to their population peak, compared with crop associations. Considering the aphidophagous beneficials, significantly more ladybirds were observed in the associations, compared with the pure stand during their abundance peak. Yellow pan traps were also used to assess the diversity and abundance of adult beneficial species. The parasitoid species Aphidius gifuensis (Ashmead) was prevalent. Among predators, Propylea japonica (Thunberg) and Harmonia axyridis (Pallas) were the most abundant species. This study contributes to better understand the potential of crop associations with wheat as a sustainable method to control aphid populations in this region of China. [less ▲]

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See detailEffets de divers types de matières organiques en comparaison avec une fertilisation minérale sur les propriétés et la production d'un sol acide au Rwanda
Culot, Marc ULg; Mbonigaba Muhinda, Jean-Jacques; Bizimara, R.

in Etudes Rwandaises (2002), 5

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See detailEffets de facteurs incitatifs à la production sur les exploitations cotonnières au Mali
Koné, Bouréma ULg; Berti, Fabio ULg; Lebailly, Philippe ULg et al

in Les Cahiers de l'Economie rurale (2012), (15 (juillet-décembre 2012)), 29-38

Cotton is the first export crop in Mali with CFAF 84,370 billion in 2010 (INSTAT, 2010), but the production of this crop faces huge problems due to external and internal factors. This work is carried out ... [more ▼]

Cotton is the first export crop in Mali with CFAF 84,370 billion in 2010 (INSTAT, 2010), but the production of this crop faces huge problems due to external and internal factors. This work is carried out in an economic context where action has been taken to boost cotton production in Mali. The objective of this work is to analyze the effects of the incentive policy for cotton production on agricultural farms in Mali. The investigations were conducted among 240 farms in the CMDT regions on a two villages per region basis in 2008/09, 2010 and 2011/12. The results showed a positive trend in production (mainly due to an increase in the area) and income for cotton producers with a higher reimbursement rate of input credits. These incentive measures, favored by the world price of cotton fiber, have created a great motivation for producers to expand cropping areas in order to increase their production and income but with low yields. [less ▲]

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See detailEffets de facteurs neuronotrophiques sur la régénération des neurones auditifs adultes in vitro
Lefebvre, Philippe ULg; Weber, T.; Delrée, P. et al

Conference (1990, November)

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See detailEffets de l'âge et de la privation de sommeil sur les oscillations lentes en sommeil NREM
Lafortune, M; Viens, I; Poirier, G et al

Poster (2009, March)

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See detailEffets de l'anesthésie péridurale sur le système respiratoire
Brichant, Jean-François ULg

Doctoral thesis (1991)

Detailed reference viewed: 23 (5 ULg)