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See detailInfluence of body size on tibial nerve somato sensory evoked potentials in dogs
Poncelet, Luc; Michaux, Charles; Balligand, Marc ULg

in American Journal of Veterinary Research (1993)

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See detailInfluence of brain-derived neurotrophic factor val66met human polymorphism on declarative memory consolidation
Mascetti, Laura ULg; Foret, Ariane ULg; Matarazzo, Luca et al

Poster (2010, November 15)

The Brain-Derived Neurotrophic Factor (BDNF) is a neurotrophin which in the adult brain regulates long-term potentiation. In humans, valine (val) to methionine (met) substitution in the 5’ pro-region of ... [more ▼]

The Brain-Derived Neurotrophic Factor (BDNF) is a neurotrophin which in the adult brain regulates long-term potentiation. In humans, valine (val) to methionine (met) substitution in the 5’ pro-region of the BDNF protein is associated with poorer episodic memory. Neurons transfected with met-BDNF-Green Fluorescence Protein showed lower depolarization-induced secretion, while constitutive secretion is unchanged. Here, we hypothesized that the differences in BDNF release determined by this polymorphism would influence memory consolidation and that in comparison with the val/met (=val/met or met/met), val/val individuals would show higher memory performance and different brain responses during a 16h-delayed rather than immediate retrieval session. Participants encoded a series of neutral faces in the afternoon. Retrieval sessions took place one hour after the encoding session, and in the following morning, during the acquisition of functional Magnetic Resonance Imaging (fMRI) time series with a 3 Tesla Allegra scanner. During retrieval, studied faces and new ones were presented in random order. For each stimulus, the subjects indicated whether they could retrieve the encoding episode with (“Remember”), or without details (“Know”), or if they thought the item had not been presented during encoding (“New”). A repeated-measure ANOVA on discrimination index (d’) showed significant effects of group (F(1, 27)=8.65, p=0.007, n(val/val)=14, n(val/met)=15) and session (F(1, 27)=24.64, p=0.000), although the group by session interaction was not significant (F(1, 27)=1.29, p=0.267). fMRI results showed a significant genotype (val/val > val/met) by session (delayed > immediate retrieval) by memory type (Remember > Know) interaction in the right inferior occipital gyrus (x=42, y=-78, z=0, p=0.004, Z=3.77), the left inferior parietal lobule (x=-56, y=-40, z=48, p=0.013, Z=3.43), the posterior cingulate cortex (x=14, y=-42, z=42, p=0.019, Z=3.29) and the right hippocampus (x=28, y=-22, z=-22, p=0.03, Z=3.11). Val/val individuals demonstrate higher memory performance than met-carriers but the change in memory performance between immediate and delayed retests is similar in both allelic groups. In contrast, neural correlates of recollection change between sessions differently according to genotype: responses increase significantly more in val/val than in val/met individuals in brain areas involved in the retrieval, accumulation and binding of perceptual memory details during delayed, relative to immediate retest. These data suggest that activity-dependent BDNF release promotes memory consolidation during the first post-training hours. [less ▲]

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See detailInfluence of Brain-Derived Neurotrophic Factor val66met human polymorphism on declarative memory consolidation during sleep
Mascetti, Laura ULg; Foret, Ariane ULg; Matarazzo, Luca et al

Poster (2010, September 15)

Objectives The Brain-Derived Neurotrophic Factor (BDNF) is a neurotrophin which in the adult brain, regulates long-term potentiation and has been involved in the build up of the homeostatic sleep pressure ... [more ▼]

Objectives The Brain-Derived Neurotrophic Factor (BDNF) is a neurotrophin which in the adult brain, regulates long-term potentiation and has been involved in the build up of the homeostatic sleep pressure in rodents. In humans, valine (val) to methionine (met) substitution in the 5’ pro-region of the BDNF protein is associated with poorer episodic memory. Neurons transfected with met-BDNF-Green Fluorescence Protein showed lower depolarization-induced secretion, while constitutive secretion is unchanged. Here, we hypothesized that the differences in BDNF release determined by this polymorphism would influence sleep-dependent memory consolidation and that in comparison with the met-carriers (val/met or met/met), val/val individuals would show higher memory performance after one night of sleep rather than an immediate retrieval session. Methods Participants encoded a series of neutral faces in the afternoon. Retrieval sessions took place one hour after the encoding session, and in the following morning, after a night of polysomnographic-monitored sleep. During retrieval, studied faces and new ones were presented in random order. For each stimulus, the subjects indicated whether they could retrieve the encoding episode with (“Remember” response), or without details (“know” response), or if they thought the item had not been presented during encoding (“New” response). Results A repeated-measure ANOVA on discrimination index (d’) showed significant effects of group (F(1, 22)=4.66, p=0.042) and session (F(1, 22)=12.21, df=1, p=0.002). Although the group by session interaction was not significant (F(1, 22)=1.84, p=0.188), exploratory planned comparisons showed that at immediate retrieval, d’ was not significantly different between groups (val/val, d’ = 1.94±0.16; met-carriers, d’= 1.61±0.14; p>0.5). In contrast, during the second retest (the next day) d’ in the val/val group (d’=2.56±0.23) was significantly higher than in the met-carriers group (d’=1.88±0.21; p=0.041). Likewise, a between-session enhancement in d’ was detected only in the val/val population (p=0.003). Conclusion Val/val individuals demonstrate higher memory performance than met-carriers after a night of sleep but not at immediate retest. These data suggest that activity-dependent BDNF release promotes memory consolidation during the first post-training hours. Further analysis of the present data set will assess the respective effect of sleep and time on the BDNF-associated delayed memory enhancement. This study was supported by FNRS-FRIA, the University of Liège, and the QEMF. [less ▲]

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See detailInfluence of breathing pattern and lung inflation on impulse oscillometry measurements in horses.
Van Erck, Emmanuelle; Votion, Dominique ULg; Kirschvink, Nathalie et al

in Veterinary Journal (2004), 168(3), 259-69

The objective of this paper was to determine if changes in ventilation patterns could influence the outcome of respiratory function measurements performed with our impulse oscillometry system (IOS) in ... [more ▼]

The objective of this paper was to determine if changes in ventilation patterns could influence the outcome of respiratory function measurements performed with our impulse oscillometry system (IOS) in horses. In a first study, IOS tests were performed in vitro on six isolated equine lungs. Lung inflation levels were controlled by modifying depressurisation inside an artificial thorax and different ventilation patterns were imposed. In a second in vivo study, transient variations in breathing pattern were evaluated both with the IOS and a current reference technique (CRT) in five healthy mature horses after an intravenous (i.v.) injection of lobeline hydrochloride. In both studies, respiratory rate (RR, range: 7-42 breaths/min.) and tidal volume (V(T), range: 0.4-25 L) had minor or no influence on IOS parameters. The influence of lung inflation, most marked for resistance at 5 Hz (R(5 Hz)), was limited for the considered physiological range. In vivo, statistical models indicated that maximal changes in pleural pressure (Max Delta Ppl) and peak flows were the main determinants of the variability of the resistance (R(rs)) and the reactance (X(rs)) of the respiratory system. The fourfold increase in baseline Max Delta Ppl and peak flows obtained during hyperpnoea caused a significant increase in R(rs) at 5 and 10 Hz and a decrease in X(rs) at all frequencies. We conclude that IOS parameters are not influenced by tachypnoea, but will reflect alterations in respiratory mechanics caused by hyperpnoeic breathing [less ▲]

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See detailInfluence of breed and previous storage time on color and lipid stability of beef packaged in high-oxygen atmosphere
Didimo Imazaki, Pedro Henrique ULg; Tahiri, Assia ULg; Thimister, Jacqueline ULg et al

Poster (2013, August 20)

The aim of this study was to compare the effect of two breeds (Belgian Blue vs. Limousin) and previous vacuum storage time on color and lipid stability of meat packaged in high-oxygen atmosphere. Vacuum ... [more ▼]

The aim of this study was to compare the effect of two breeds (Belgian Blue vs. Limousin) and previous vacuum storage time on color and lipid stability of meat packaged in high-oxygen atmosphere. Vacuum packaged striploins from Belgian Blue and Limousin cows were stored at −1 °C and +4 °C for up to 60 days and analyzed. Part of these samples were repackaged under modified atmosphere – 70 % O2/30 % CO2 – at different times, stored 2 days at +4 °C and 5 d at +8 °C, and then analyzed. The following parameters were evaluated: color (CIE L*a*b*), metmyoglobin %, lipid oxidation (TBARS) and fat content. Color measurement and metmyoglobin % determination showed greater pigment stability in Belgian Blue samples than in Limousin. Belgian Blue also presented higher lipid stability (TBARS). A positive correlation between pigment oxidation and lipid oxidation was highlighted. The greater amount of fat in meat of Limousin could partially explain its higher sensitivity to oxidation. Nevertheless, other factors may be involved in oxidative stability such as metmyoglobin reducing activity and antioxidant capacity. An understanding of the oxidative processes and their interaction would provide a basis for explaining quality deterioration in meat and for developing strategies to maintain sensory qualities. [less ▲]

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See detailInfluence of breed of fetus on periparturient endocrine responses and subsequent milk production of Ayrshire dams
Guilbault, L. A.; Roy, G. L.; Beckers, Jean-François ULg et al

in Journal of Dairy Science (1990), 73(10), 2766-2773

Purebred Ayrshire females were assigned to two groups based on the breed of fetus carried during gestation. In group 1, Limousin embryos were transferred nonsurgically into Ayrshire recipients (10 heifers ... [more ▼]

Purebred Ayrshire females were assigned to two groups based on the breed of fetus carried during gestation. In group 1, Limousin embryos were transferred nonsurgically into Ayrshire recipients (10 heifers and 1 cow), and in group 2, 11 Ayrshire heifers and 1 cow were inseminated artificially to Ayrshire bulls. Blood samples were collected daily from d 265 of gestation until d 15 postpartum from 5 heifers of each group. Milk yield was recorded on alternate weeks during the first 20 wk postpartum. Calf birth weight was higher (44.2 vs. 35.4 kg) and gestation was longer (297.4 vs. 280.2 d) in Ayrshire dams bearing Limousin fetuses than in those bearing Ayrshire fetuses. Daily milk production for the first 20 wk was lower (18.1 vs. 20.8 kg) in Ayrshire dams bearing Limousin fetuses than in those bearing Ayrshire fetuses. Prepartum decrease in progesterone concentrations and increase in estrone concentrations were faster in Ayrshire heifers bearing Limousin fetuses than in those bearing Ayrshire fetuses. Profiles of peripartum concentrations of bovine placental lactogen differed between Ayrshire dams carrying different families of Limousin fetuses but were similar in those carrying families of Ayrshire fetuses. The concentrations of 15-keto-13,14-dihydroprostaglandin F2 were lower during the postpartum period in heifers that gave birth to Limousin calves than in those that had Ayrshire calves. In conclusion, the breed of fetus influences physiological and endocrine responses of the dam, which might have some effect on milk production of the dam. [less ▲]

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See detailInfluence of bridge deck shape on extreme buffeting forces
Flamand, Olivier; Denoël, Vincent ULg

in Proceedigs of 13th International Conference on Wind Engineering (2011)

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See detailThe influence of calcium carbonate-wheat flour mix addition on sunflower halva stability and texture
Muresan, Vlad; Racolta, Emil; Muste, Sevastita et al

Poster (2013, July 01)

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See detailInfluence of calving season on the interactions among reproductive disorders of dairy cows.
Labernia, J.; Lopez-Gatius, F.; Santolaria, P. et al

in Animal Science Journal (1998), 67

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See detailThe influence of canine obesity on endocrine and clinical pathology parameters
Diez, Marianne ULg; Nguyen, Patrick

in Proceedings of the ACVP 58th Annual Meeting (2007)

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See detailInfluence of carbide precipitation on hot hardness of high speed steel rolls
Herman, M.; Breyer, J. P.; Lecomte-Beckers, Jacqueline ULg

in Proceedings of the Southern African Roll Users' Conference (SARUC) (2006)

This paper will illustrate the choice of the alloying elements and their content in the current grade. By using sophisticated laboratory examination techniques such as differential thermal analysis ... [more ▼]

This paper will illustrate the choice of the alloying elements and their content in the current grade. By using sophisticated laboratory examination techniques such as differential thermal analysis, scanning electron microscopy and image analysis, the metallurgical parameters of Aurora grade will be described and compared to those of the Kosmos grade. An attempt will also be made to connect all our laboratory results to the good behaviour of the alloy in operation in the early stands of Hot Strip Mills. [less ▲]

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See detailInfluence of carbon xerogel textural properties on the dynamic adsorption of methyl iodide
Almazán-Almazán, M. C.; López-Domingo, F. J.; Domingo-García, M. et al

in Chemical Engineering Journal (2011), 173(1), 19-28

X-ray microtomography coupled to image analysis has been used to study the influence of the adsorbent pore texture and the experimental conditions on the dynamic adsorption of methyl iodide in packed ... [more ▼]

X-ray microtomography coupled to image analysis has been used to study the influence of the adsorbent pore texture and the experimental conditions on the dynamic adsorption of methyl iodide in packed filters. By applying this imaging technique the internal axial adsorption profiles for increasing exposure times to the gas stream are analysed. This experimental technique establishes a new technology to study in situ the dynamic adsorption of volatile compounds. Resorcinol-formaldehyde based carbon xerogels have been used as adsorbents, as their pore texture can be tuned by changing the synthesis conditions. The textural characteristics of the adsorbents (surface areas and pore volumes) have been assessed by using nitrogen and carbon dioxide adsorption as well as mercury porosimetry. The methyl iodide dynamic adsorption results show that, for the same gas flow rate and CH3I inlet concentration, the adsorbed amount is highly dependent on large pore volumes. Thus, samples with almost the same micropore volumes (adsorption volumes) have different methyl iodide adsorption capacities, which are related to, the above mentioned, large pores. The influence of both the gas carrier flow rate and the methyl iodide inlet concentration on the adsorption can be explained using the so-called linear driving force model. This approach takes into account the fact that internal transport limitations are directly related to the pore texture. Moreover, the simulation of the dynamic adsorption process has allowed relating the simulated axial concentration profiles to the experimental X-ray microtomography data. [less ▲]

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See detailInfluence of cement and aggregate type on thaumasite formation in concrete
Nielsen, peter; Sven, Nicolai; Darimont, Anne ULg et al

in Cement & Concrete Composites (2014), 53

In this study the influence of binder type on the formation of thaumasite in mortars made with expanded clay lightweight aggregates (LWA) was examined. For this purpose mortar prisms (20x20x160mm) were ... [more ▼]

In this study the influence of binder type on the formation of thaumasite in mortars made with expanded clay lightweight aggregates (LWA) was examined. For this purpose mortar prisms (20x20x160mm) were made with different binders and expanded clay lightweight aggregate or quartz sand, which after 28 days of curing in water were exposed to a 2.37 % Na2SO4 solution. The length and weight change of the prisms was recorded in triplicate as a function of time of exposure to dry-wet cycles in the sulphate solution or deionised water, at a temperature of 5 ± 1°C. The influence of the binder type on the expansion of the prisms in the 2.37 % Na2SO4 solution with dry and wet cycling can be ordered from strong to weak as follows: (1) CEM I + limestone filler, (2) CEM I, (3) CEM I + fly ash, (4) CEM III. The use of specific cements or cement blends can clearly inhibit the formation of thaumasite (and/or ettringite). The influence of the aggregate type (quartz versus LWA) on the sulphate reaction is more difficult to determine because the porosity of LWA can accommodate the growing sulphate crystals. All the mortar prisms made with quartz aggregate were bent or broken after 21 to 24 weeks exposure to the sulphate solution, while most mortar prisms made with expanded clay aggregate were still intact. The only exception being the mortar prisms containing limestone filler. The latter disintegrated between 24 and 34 weeks of exposure to the sulphate solution. The expansion of the prisms made with CEM I and CEM I + fly ash levelled off between 50 and 100 weeks of exposure to the sulphate solution. The prisms made with CEM III showed minimal expansion (≤ 0.1 %) after 3 years of exposure. The prisms exposed to demineralised water showed no or minimal expansion. The presence and mineralogy of secondary sulphate phases in the mortars was checked by XRD analysis and SEM-EDS analysis of (degraded) mortar prisms. In most cases a solid solution of ettringite-thaumasite was observed. Based on the composition, treatment and expansion of the different mortar prisms, key factors controlling the formation of thaumasite or a solid solution of thaumasite-ettringite are discussed. [less ▲]

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See detailInfluence of Chemical Composition on the Microstructure and Mechanical Properties of Multiphase TRIP-assisted Steels Processed Using Thermal Cycles Compatible With Continuous Hot-Dip Galvanizing
Mertens, Anne ULg; McDermid, Joseph R.

in Iron and Steel Technology (2007)

This article discusses recent studies on the effect of processing conditions compatible with continuous hot-dip galvanizing, namely a high bainitic temperature and mechanical properties of TRIP-assisted ... [more ▼]

This article discusses recent studies on the effect of processing conditions compatible with continuous hot-dip galvanizing, namely a high bainitic temperature and mechanical properties of TRIP-assisted steels are the focus. [less ▲]

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See detailInfluence of chemical composition on the microstructure and mechanical properties of multiphase TRIP-assisted steels, processed using thermal cycles compatible with continuous hot-dip galvanizing
Mertens, Anne ULg; McDermid, Joseph R.

in Proceedings of the MS&T'06 Conference (2006, October)

Multiphase TRIP-assisted steels are particularly interesting for the automotive industry, as they exhibit an exceptional strength-ductility balance due to the combination of a multiphase microstructure ... [more ▼]

Multiphase TRIP-assisted steels are particularly interesting for the automotive industry, as they exhibit an exceptional strength-ductility balance due to the combination of a multiphase microstructure and the mechanically-induced transformation of metastable austenite to martensite (i.e. the TRIP effect). The multiphase microstructure - and the retention of metastable austenite - is achieved through the combination of appropriate chemistry and heat treatment conditions, i.e. an intercritical anneal followed by an isothermal dwell in the temperature range for bainite formation. The present work focuses mainly on the effect of heat treatment conditions that are compatible with CGL process, i.e. a high bainitic dwell temperature, on the microstructure and mechanical properties of two TRIP-assisted steel grades differing by their silicon and aluminium contents. It has thus been established that it seems easier to retain austenite when Si is replaced by Al, and more particularly that it was possible to retain a significant amount of austenite in a mixed 0.5Al-1.0Si grade, and hence to observe a TRIP effect. On the other hand, a Si-alloyed grade did not exhibit a significant retention of austenite, possibly due to carbide precipitation. It has also be seen that the intercritical annealing temperature has a strong influence on the amount of austenite that can ultimately be retained after the bainitic dwell, possibly by affecting the C content in the intercritical austenite. [less ▲]

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See detailThe influence of children’s and parents’ illness perceptions on paediatrics cancer patients’ quality of life
Fonseca, Marta; Missotten, Pierre ULg; Etienne, Anne-Marie ULg et al

in Psychology & Health (2010), 25(7 Supp1), 35

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See detailInfluence of chloride and phosphate on the binding of oxygen to canine and feline red blood cells
Cambier, Carole ULg; Wiernickx; Clerbaux, Th et al

in Pflügers Archiv : European Journal of Physiology (2004), 447

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See detailInfluence of cholesterol on survival after stroke. Cholesterol may be marker of inflammation.
VALDES SOCIN, Hernan Gonzalo ULg

in BMJ (Clinical Research ed.) (1997), 315(7116), 1159

Detailed reference viewed: 10 (7 ULg)