Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailEffect Of Feed N-15 Incorporation Into Solid-Associated Bacteria On The In Situ Nitrogen Degradability Of N-15 Labelled Italian Ryegrass
Kamoun, Mohammed; Lopez, Secundino; Beckers, Yves ULg et al

in Animal Feed Science & Technology (2007), 135(3-4), 353-361

The objective of this study was to examine the effect of microbial contamination of the incubation residue on the in situ nitrogen degradability of Italian ryegrass. Microbial nitrogen in the bag residues ... [more ▼]

The objective of this study was to examine the effect of microbial contamination of the incubation residue on the in situ nitrogen degradability of Italian ryegrass. Microbial nitrogen in the bag residues was estimated by the feed 15N dilution procedure, and the incorporation of feed 15N into the adherent bacteria was assessed after isolating a bacterial pellet and determining its 15N enrichment. Isotopically labelled Italian ryegrass (fertilized with 15NH4 15NO3) was harvested either in spring (early cut) or in summer (late cut). Forages were incubated in the rumen of two steers for 6, 24 and48 h. The proportion of microbial N per unit of total N in the bag residue increased with incubation time, ranging from 184 to 853 mg microbial N/g totalN at 6 and 48 h, respectively. 15N enrichment in the bacterial pellet was highest after 6 h of incubation (3.6 mg 15N/g N) and then declined steadily (0.8 mg 15N/gN in 48-h residues). Microbial 15N represented up to 0.422 g/g total 15N in the bag residue, but the incorporation of feed 15N into bacterial N did not account for more than 57 mg/g 15N incubated, this incorporation rate decreasing progressively with incubation time. Correction of apparent N disappearance for microbial N resulted in higher values of N degradability, especially for the late cut grass. A further correction considering the amount of microbial 15N had little effect on the estimation of corrected N degradability values. Therefore, some of the feed 15N is incorporated into bacterial N, but this fraction has a minor effect on the estimation of total microbial N in the bag residue by the feed 15N dilution approach, and hence on the estimation of corrected degradability values. [less ▲]

Detailed reference viewed: 36 (4 ULg)
Peer Reviewed
See detailEffect of feed-, nitrogen-, fibres- and water-intakes on emissions of NH3, N2O, CH4, CO2 and water vapour of grouped gestating sows kept on straw-based deep litter
Philippe, François-Xavier ULg; Canart, Bernard; Laitat, Martine ULg et al

in 13th RAMIRAN International Conference, Potential for simple technology solutions in organic management (2008)

Detailed reference viewed: 43 (10 ULg)
Full Text
See detailEffect of feeding lambs with fat rapessed meal on the quality of their depot fat.
Wathelet, Jean-Paul ULg; Mabon, N.; Marlier, M.

in GCIRC Bulletin (1999)

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailEffect of feeding regimes on growth and survival of Clarias gariepinus larvae: replacement of Artemia by a commercial feed
Vandecan, M.; Diallo, A.; Mélard, Charles ULg

in Aquaculture Research (2011), 42(5), 733-736

Detailed reference viewed: 86 (13 ULg)
Full Text
Peer Reviewed
See detailEffect of FEM choices in the modelling of incremental forming of aluminium sheets
He, S.; Van Bael, A.; Van Houtte, P. et al

in Banabic, D. (Ed.) Proceedings of the 8th ESAFORM Conference on Material Forming (2005)

This paper investigates the process of single point incremental forming of an aluminium cone with a 50-degree wall angle. Finite element (FE) models are established to simulate the process. Different FE ... [more ▼]

This paper investigates the process of single point incremental forming of an aluminium cone with a 50-degree wall angle. Finite element (FE) models are established to simulate the process. Different FE packages have been used. Various aspects associated with the numerical choices as well as the material and process parameters have been studied. The final geometry and the reaction forces are presented as the results of the simulations. Comparison between the simulation results and the experimental data is also made. [less ▲]

Detailed reference viewed: 113 (5 ULg)
Full Text
Peer Reviewed
See detailEffect of Fengycin, a Lipopeptide Produced by Bacillus Subtilis, on Model Biomembranes
Deleu, Magali ULg; Paquot, Michel ULg; Nylander, T.

in Biophysical Journal (2008), 94(7), 2667-2679

Detailed reference viewed: 15 (4 ULg)
Peer Reviewed
See detailEffect of fertilisation with selenium on plasma selenium in Belgian Blue suckling cows and heifers: first results
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Coenen, M. et al

in Land use systems in grassland dominated regions, 20th General Meeting of the European Grassland Federation (2004)

Detailed reference viewed: 5 (3 ULg)
Peer Reviewed
See detailEffect of fertilisation with selenium on plasma selenium in Belgian Blue suckling cows and heifers: first results
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Coenen, M. et al

in Land use systems in grassland dominated regions, Book of abstracts of 20th General Meeting of the European Grassland Federation (2004)

Detailed reference viewed: 3 (0 ULg)
Full Text
Peer Reviewed
See detailThe effect of fiber morphology on the tensile strength of natural fibers
Alves Fidelis, Maria Ernestina; Vitorino Castro Pereira, Thatiana; Da Fonseca Martins Gomes, Otavio ULg et al

in Journal of Materials Research and Technology (2013), 2(2), 149-157

In the present work the morphology of natural fibers was correlated with their mechanical properties via image analysis. Jute, sisal, curaua, coir and piassava fibers were tested under direct tension in a ... [more ▼]

In the present work the morphology of natural fibers was correlated with their mechanical properties via image analysis. Jute, sisal, curaua, coir and piassava fibers were tested under direct tension in a universal testing machine and the cross-sectional areas of the fibers were calculated using images obtained in a scanning electron microscopy. For the jute fiber the tests were performed for several gage lengths in order to investigate its influence on the tensile strength and to compute the machine compliance. For sisal, jute and curaua fibers the amount of fiber-cells, the size of the cell walls and the real area of the fibers were measured and their correlation with the tensile strength addressed. The curaua fiber presented the highest mechanical performance with tensile strength and Young's modulus of 543 MPa and 63.7 GPa, respectively. Weibull statistical analysis was used to quantify the variability of fiber strength. The sisal fibers presented the highest Weibull modulus (3.70), whereas the curaua presented the lowest one (m = 2.2), which means that the sisal had the lowest variability and curaua the highest. [less ▲]

Detailed reference viewed: 19 (1 ULg)
Full Text
Peer Reviewed
See detailEffect of filler content and size on transport properties of water vapour in PLA/calcium sulfate composites
Gorrasi, Giuliana; Vittoria, Vittoria; Murariu, Marius et al

in Biomacromolecules (2008), 9

Starting from calcium sulfate (gypsum) as fermentation byproduct of lactic acid production process, high performance composites have been produced by melt-blending polylactide (PLA) and -anhydrite II (AII ... [more ▼]

Starting from calcium sulfate (gypsum) as fermentation byproduct of lactic acid production process, high performance composites have been produced by melt-blending polylactide (PLA) and -anhydrite II (AII) filler, i.e., calcium sulfate hemihydrate previously dried at 500 °C. Characterized by attractive properties due to good filler dispersion throughout the polyester matrix and favorable interactions between components, these composites are interesting for potential use as biodegradable rigid packaging. The effect of filler content and mean particle diameter on the barrier properties such as sorption and diffusion to water vapor has been examined and compared to unfilled PLA. Even without additional treatments, the presence of the filler introduced constraints on molecular mobility in the permeable phase of amorphous PLA and the amount of solvent absorbed appears lower in the highly filled composites. Surprisingly, for PLA-30% AII compositions, by addition of filler characterized by high mean particle diameter (e.g., 43 μm) the thermodynamic diffusion parameter, D0, decreased up to 2 orders of magnitude. The dimension of filler particles and their percentage in the continuous polymeric phase seem to be the most important parameters that determine the barrier properties of the PLA-AII composites to water vapor. [less ▲]

Detailed reference viewed: 9 (0 ULg)
Full Text
See detailEffect of finger tapping frequency on abnormal subthalamic nucleus oscillations in Parkinson’s disease
Stamatakis, Julien; Noirhomme, Quentin ULg; Orban, Jonhatan et al

Poster (2012, October)

Detailed reference viewed: 36 (8 ULg)
Peer Reviewed
See detailEffect of fish oil supplementation in a model of a feline asthma
Kirschvink, N.; Leemans, Jérôme ULg; Delvaux, F. et al

in Acta Physiologica (2008), 192(662 Suppl), 10

Detailed reference viewed: 39 (4 ULg)
Full Text
See detailEffect of food intake levels on leptin and IGF-I plasma concentrations in sheep
Archa, Bouchaib; Bister, Jean-Loup; Colinet, Frédéric ULg et al

in Acta Physiologica (2006), 187(Suppl 651), 4

The effect of high (H) or low (L) levels of food intake, during the preceding 51 weeks, on leptin and Insulin-like growth factor-I (IGF-I) plasma concentrations in sheep were investigated in groups of 20 ... [more ▼]

The effect of high (H) or low (L) levels of food intake, during the preceding 51 weeks, on leptin and Insulin-like growth factor-I (IGF-I) plasma concentrations in sheep were investigated in groups of 20 adult Timahdite (non-lactating, non-pregnant) ewes. Ewes of the two treatments had similar liveweight at the start of study but there was a twofold difference in energy intake. All animals were maintained indoors under natural daylength conditions (33°53'N, 5°32'W). Blood samples were collected monthly and the statistical analyses were performed on leptin and IGF-I levels. The mean leptin plasma concentrations were higher in H ewes than L sheep (3.98±0.97 ng/ml vs 3.34±1.17 ng/ml, P<0.05). For IGF-I, from week 1 to 26, the mean plasma concentrations were higher in H ewes than L sheep (76±28 ng/ml vs 58±21 ng/ml, P<0.01). However, from week 31 to 51, the mean plasma concentrations were similar in both groups (57±24 ng/ml vs 59±25 ng/ml, P>0.05). It was concluded that the food intake levels affect significantly leptin and IGF-I plasma concentrations and consequently may be the link between food intake, body condition and reproductive performances in sheep. [less ▲]

Detailed reference viewed: 60 (2 ULg)
Full Text
Peer Reviewed
See detailThe effect of food on growth and metamorphosis of paedomorphs in Triturus alpestris apuanus
Denoël, Mathieu ULg; Poncin, Pascal ULg

in Archiv für Hydrobiologie (2001), 152(4), 661-670

The effect of food level on growth and metamorphosis of paedomorphs was examined in an experimental replicated design in Triturus alpestris apuanus. Paedomorphosis concerns the retention of larval ... [more ▼]

The effect of food level on growth and metamorphosis of paedomorphs was examined in an experimental replicated design in Triturus alpestris apuanus. Paedomorphosis concerns the retention of larval characteristics in adult individuals. Newts that forgo metamorphosis and then retain gill and gill slits in the adult stage maintain an aquatic life but keep potential for undergoing metamorphosis. Paedomorphs metamorphosed later in treatments with food as a non-limiting factor than in stressful treatments where food was limited. Timing of metamorphosis did not differ between males and females. Food level greatly affected growth rates. These results confirm and extend optimality models that predict paedomorphosis under advantageous aquatic conditions (paedomorph advantage hypothesis) and metamorphosis in stressful aquatic habitats. [less ▲]

Detailed reference viewed: 183 (12 ULg)
Full Text
Peer Reviewed
See detailThe effect of food on ontogenetic pathway switching in paedomorphic Alpine newts
Denoël, Mathieu ULg; Poncin, Pascal ULg

Poster (2001)

Paedomorphosis concerns the retention of larval characteristics in adult individuals. Newts that forgo metamorphosis and then retain gill and gill slits in the adult stage maintain an aquatic life but ... [more ▼]

Paedomorphosis concerns the retention of larval characteristics in adult individuals. Newts that forgo metamorphosis and then retain gill and gill slits in the adult stage maintain an aquatic life but keep potential for undergoing metamorphosis. They are thus good biological models to test evolutionary hypotheses predicting ontogenetic pathway switching in unfavourable and stressful environments. They are also interesting targets to understand their maintenance in a large range of habitats. Our aim was then to examine the effect of food level on growth and metamorphosis of paedomorphic Alpine newts Triturus alpestris apuanus (Amphibia, Salamandridae) in an experimental replicated design. Paedomorphs metamorphosed later in treatments with food as a non-limiting factor than in stressful treatments where food was limited. Timing of metamorphosis did not differ between males and females. Food level greatly affected growth rates. These results confirm and extend optimality models that predict paedomorphosis under advantageous aquatic conditions (paedomorph advantage hypothesis) and metamorphosis in stressful aquatic habitats. [less ▲]

Detailed reference viewed: 20 (0 ULg)
Full Text
Peer Reviewed
See detailEffect of four percent carbon dioxide during the second half of incubation on embryonic development, hatching parameters, and posthatch growth.
Everaert, Nadia ULg; Kamers, B.; Witters, A. et al

in Poultry science (2007), 86(7), 1372-9

In this study, broiler embryos were exposed during the second half of incubation [embryonic day (ED) 10 until ED18] to 4% CO(2). The CO(2) was set to reach 2% on ED11 and 4% from ED12 onward. Two ... [more ▼]

In this study, broiler embryos were exposed during the second half of incubation [embryonic day (ED) 10 until ED18] to 4% CO(2). The CO(2) was set to reach 2% on ED11 and 4% from ED12 onward. Two experiments were conducted with the same setup. Embryo weight was measured and partial pressure of CO(2) and O(2) in the air cell was analyzed at several embryonic ages. Times of internal pipping, external pipping, and hatching were recorded. Chicks were raised until d 7 posthatch. Plasma corticosterone, triiodothyronine, and thyroxine concentrations were determined. Embryonic growth was not retarded and hatchability did not decrease in the CO(2)-incubated group, demonstrating that chicken embryos can tolerate high (4%) concentrations of CO(2) between ED10 and ED18. In the first experiment, partial pressure of CO(2) in the air cell was significantly higher in the CO(2) group on ED11, ED12, ED13, and ED14, but disappeared thereafter. This difference was not observed in the second experiment. A change in the hatching process of the CO(2) group was seen. Relative growths of newly hatched chicks until d 7 posthatch were equal in the CO(2) group and the control group. However, corticosterone and thyroxine concentrations were significantly higher in the CO(2)-incubated chicks on d 7 posthatch. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Full Text
Peer Reviewed
See detailEffect of freeze-drying and self-ignition process on the microstructural and electrochemical properties of Li4Ti5O12
Jamin, Claire ULg; Traina, Karl; Eskenazi, David ULg et al

in Materials Research Bulletin (2013), 48

Crystalline Li4Ti5O12 is synthesized by a method involving the freeze-drying and self-ignition of a gel prepared from titanium isopropoxide, lithium nitrate and hydroxypropylmethylcellulose (HPMC). This ... [more ▼]

Crystalline Li4Ti5O12 is synthesized by a method involving the freeze-drying and self-ignition of a gel prepared from titanium isopropoxide, lithium nitrate and hydroxypropylmethylcellulose (HPMC). This synthesis route yields crystalline Li4Ti5O12 particles after calcination at 800°C for 2 h. In an alternative route, addition of ammonium nitrate shifts the self-ignition mode from wave-like propagation to simultaneous. Powders with different microstructures are thereby obtained. Electrochemical characterization shows that the best results for Li+ intercalation/desintercalation are obtained for the powder prepared without ammonium nitrate addition. These results highlight the necessity for a control of the self-ignition mode to obtain adequate properties. [less ▲]

Detailed reference viewed: 35 (10 ULg)
Full Text
Peer Reviewed
See detailEffect of friction in a toy model of granular compaction
Ludewig, François ULg; Dorbolo, Stéphane ULg; Vandewalle, Nicolas ULg

in Physical Review E (2004), 70(5, Pt 1), 51304

A toy model of granular compaction which includes some resistance due to granular arches is proposed. In this model, the solid/solid friction of contacting grains is a key parameter and a slipping ... [more ▼]

A toy model of granular compaction which includes some resistance due to granular arches is proposed. In this model, the solid/solid friction of contacting grains is a key parameter and a slipping threshold omega(c) is defined. Realistic compaction behaviors have been obtained. Two regimes separated by a critical point omega(c)* of the slipping threshold have been emphasized: (i) a slow compaction with lots of paralyzed regions and (ii) an inverse logarithmic dynamics with a power-law scaling of grain mobility. Below the critical point omega(c)*, the physical properties of this frozen system become independent of omega(c). Above the critical point omega(c)*-i.e., for low friction values-the packing properties behave as described by the classical Janssen theory for silos. [less ▲]

Detailed reference viewed: 20 (7 ULg)