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See detailThe influence of cognitive reserve on inter-individual variability in resting-state cerebral metabolism in normal aging
Bastin, Christine ULg; Yakushev, Igor; Bahri, Mohamed Ali ULg et al

in Frontiers in Human Neuroscience (2012)

Detailed reference viewed: 34 (5 ULg)
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See detailInfluence of collar design on palatal implant primary stability
Bolland, Fabrice; Ronco, Vincent; LAMBERT, France ULg et al

Poster (2007, April)

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See detailInfluence of colors on habituation of visual evoked potentials in patients with migraine with aura and in healthy volunteers.
Afra, J; Ambrosini, A; Génicot, Roger ULg et al

in Headache (2000), 40(1), 36-40

OBJECTIVE: To investigate whether colored glasses influence the habituation of visual evoked potentials. BACKGROUND: We have previously shown that during pattern-reversal stimulations lasting 2 minutes ... [more ▼]

OBJECTIVE: To investigate whether colored glasses influence the habituation of visual evoked potentials. BACKGROUND: We have previously shown that during pattern-reversal stimulations lasting 2 minutes the amplitude of the visual evoked potential increases in migraine with and without aura between attacks, whereas it decreases in healthy volunteers. Red light was found to increase visually evoked EEG fast activity only in children with migraine with aura. Wearing rose-tinted glasses for 4 months decreased attack frequency in parallel with a reduction of the visually evoked EEG fast activity. METHODS: We compared the change in amplitude of the visual evoked potential using five different tinted glasses in 12 patients with migraine with aura and in 10 healthy volunteers. During continuous stimulation at 3.1 Hz, five blocks of 50 responses were sequentially averaged using red, yellow, green, blue, and grey glasses and without glasses in a random order and analyzed in terms of latencies and N1-P1 amplitudes. Amplitude changes were calculated for each block by comparison with the first block in every condition and analyzed statistically using Zerbe's method. RESULTS: In healthy volunteers, the visual evoked potential amplitude increased with red glasses compared to without glasses (P = .05) or with green glasses (P = .03). In patients with migraine with aura, no significant difference was detected using colored glasses. Our findings in healthy volunteers are in line with earlier reports of increased excitability of the human visual cortex when exposed to red light. The lack of such a pattern in patients with migraine with aura suggests that the visual cortex is interictally hypoexcitable rather than hyperexcitable, which is consistent with studies of transcranial magnetic stimulation. [less ▲]

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See detailInfluence of compartment geometry on the residence time of single drops in Kühni extraction columns
Buchbender, Florian; Fischer, Armin; Pfennig, Andreas ULg

in Chemical Engineering Science (2013), 104

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See detailInfluence of COMT Genotype on Antero-Posterior Cortical Functional Connectivity Underlying Interference Resolution
Jaspar, Mathieu ULg; Manard, Marine ULg; DIDEBERG, Vinciane ULg et al

in Cerebral Cortex (2016), 26

Genetic variability related to the catechol-O-methyltransferase (COMT) gene (Val158Met) has received increasing attention as a possible modulator of executive functioning and its neural correlates ... [more ▼]

Genetic variability related to the catechol-O-methyltransferase (COMT) gene (Val158Met) has received increasing attention as a possible modulator of executive functioning and its neural correlates. However, this attention has generally centred on the prefrontal cortices because of the well-known direct impact of COMT enzyme on these cerebral regions. In this study, we were interested in the modulating effect of COMT genotype on anterior and posterior brain areas underlying interference resolution during a Stroop task. More specifically, we were interested in the functional connectivity between the right inferior frontal operculum (IFop), an area frequently associated with inhibitory efficiency, and posterior brain regions involved in reading/naming processes (the two main non-executive determinants of the Stroop effect). The Stroop task was administered during fMRI scanning to three groups of 15 young adults divided according to their COMT Val158Met genotype [Val/Val (VV), Val/Met (VM) and Met/Met (MM)]. Results indicate greater activity in the right IFop and the left middle temporal gyrus (MTG) in homozygous VV individuals than in Met allele carriers. In addition, the VV group exhibited stronger positive functional connectivity between these two brain regions and stronger negative connectivity between the right IFop and left lingual gyrus. These results confirm the impact of COMT genotype on frontal function. They also strongly suggest that differences in frontal activity influence posterior brain regions related to a non-executive component of the task. Especially, changes in functional connectivity between anterior and posterior brain areas might correspond to compensatory processes for performing the task efficiently when the available dopamine level is low. [less ▲]

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See detailThe influence of COMT single nucleotide polymorphism (rs4680) on the neural substrates of working memory representations maintenance in healthy aging
Manard, Marine ULg; François, Sarah ULg; Bahri, Mohamed Ali ULg et al

Poster (2016, May 10)

The COMT val108/158met polymorphism was associated to the dopaminergic modulation in the brain, and therefore stimulated research on its influence for cognitive functioning and particularly working memory ... [more ▼]

The COMT val108/158met polymorphism was associated to the dopaminergic modulation in the brain, and therefore stimulated research on its influence for cognitive functioning and particularly working memory. First, a general advantage of carrying the met allele was reported. However, many studies used tasks that did not allow efficiently assessing the contribution of manipulation and maintenance processes in working memory, leading to divergent results, in both young and older populations, resulting in debates about the exact phenotypic effect of the COMT polymorphism. Using fMRI, this study was designed to assess the potential effect of the COMT polymorphism on age-related differences in working memory representations maintenance abilities (Sternberg paradigm). Partial Least Squares method was used to determine the brain-behavior correlations at low, intermediate, and high cognitive demands among young and older groups, homozygous for the val or for the met allele. First, young val/val showed some disadvantages at brain and behavioral level compared to their m/m counterparts. However, in older adults subgroups, the m/m participants tended to show greater age-related difference (when compared to younger adults with similar genotype), suggesting an advantage in carrying the val allele when dopamine signaling is not at optimal efficiency (optimal: young/middle adulthood vs suboptimal: childhood or older ages). These results will be discussed in regard to compensating theories and dopaminergic models accounting for the potential effect of COMT polymorphism on stability/flexibility abilities. [less ▲]

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See detailInfluence of concentration on equine fresh semen conservation
Ponthier, Jérôme ULg; Bloomaert, Didier; Parrilla Hernandez, Sonia ULg et al

in Reproduction in Domestic Animals (2013, September), 48(suppl1), 85

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See detailInfluence of contact resistance on shielding efficiency of shielding gutters for high-voltage cables
Koroglu, S.; Sergeant, P.; V Sabariego, Ruth ULg et al

in IET Electric Power Applications (2011), 5(9), 715-720

The shielding of buried three-phase high-voltage power lines can be done by placing them in conducting ferromagnetic U-shaped gutters covered with plates. In case of a perfect electrical contact between ... [more ▼]

The shielding of buried three-phase high-voltage power lines can be done by placing them in conducting ferromagnetic U-shaped gutters covered with plates. In case of a perfect electrical contact between adjacent gutters and between adjacent cover plates, induced currents in the shield efficiently reduce the magnetic field generated by the cables. As however a perfect contact cannot be guaranteed, in practice, it is useful to quantify the effect of a defective electrical contact on the field reduction. From two-dimensional/three-dimensional finite element computations and experiments, the influence of the contact resistance on the shielding efficiency is investigated, as a function of the ratio of axial length to height of the shield elements. Furthermore, the effect of other parameters on the shielding efficiency is studied: the ratio of axial length to height, a parasitic air gap between the gutter and the cover plate and the type of the shield material. It was found that a low contact resistance deteriorates much more the shielding in case of an aluminium shield than in case of a steel shield. As expected, the effect is larger for shield elements with relatively short axial length with regard to the other dimensions. Nevertheless, the effect remains quite significant for aluminium shields with practically convenient dimensions. [less ▲]

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See detailInfluence of contact resistance on shielding efficiency of shielding gutters for HV cables
Koruglu, Selim; Sergeant, Peter; V Sabariego, Ruth ULg et al

in Proceedings of the 14th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2010) (2010, May)

Shielding of buried three phase high voltage cables can be done by placing the cables in conducting ferromagnetic U- shaped gutters covered by plates. In case of a perfect electrical contact between ... [more ▼]

Shielding of buried three phase high voltage cables can be done by placing the cables in conducting ferromagnetic U- shaped gutters covered by plates. In case of a perfect electrical contact between adjacent gutters and between adjacent cover plates, the induced currents in the shield efficiently reduce the field generated in the vicinity of the cables. However, as a perfect contact cannot be guaranteed, it is useful to quantify the effect of a bad electrical contact on the shielding performance. From 2D FEM, 3D FEM and experiments, it is observed that a bad contact does not influence significantly the shielding if the axial length of the plates is relatively long compared to their other dimensions. [less ▲]

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See detailInfluence of contact resistance on shielding efficiency of shielding gutters for HV cables
Koroglu, Selim; Sergeant, Peter; V Sabariego, Ruth ULg et al

in Proceedings of the 14th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2010) (2010)

Shielding of buried three phase high voltage cables can be done by placing the cables in conducting ferromagnetic U-shaped gutters covered by plates. In case of a perfect electrical contact between ... [more ▼]

Shielding of buried three phase high voltage cables can be done by placing the cables in conducting ferromagnetic U-shaped gutters covered by plates. In case of a perfect electrical contact between adjacent gutters and between adjacent cover plates, the induced currents in the shield efficiently reduce the field generated in the vicinity of the cables. However, as a perfect contact cannot be guaranteed, it is useful to quantify the effect of a bad electrical contact on the shielding performance. From 2D FEM, 3D FEM and experiments, it is observed that a bad contact does not influence significantly the shielding if the axial length of the plates is relatively long compared to their other dimensions. [less ▲]

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See detailThe Influence of Context on Children’s Use of the Memorability Heuristic
Geurten, Marie ULg; Meulemans, Thierry ULg; Willems, Sylvie ULg

Poster (2015)

We examined children’s ability to employ a metacognitive heuristic based on memorability expectations to reduce false recognitions, and explored whether these expectations depend on the context in which ... [more ▼]

We examined children’s ability to employ a metacognitive heuristic based on memorability expectations to reduce false recognitions, and explored whether these expectations depend on the context in which the items are presented. Specifically, 4-, 6-, and 9-year-old children were presented with high-, medium-, and low-memorability words, either mixed together (Experiment 1) or separated into two different lists (Experiment 2). Results revealed that only children with a higher level of executive functioning (9-year-olds) used the memorability-based heuristic when all types of items were presented within the same list. However, all children, regardless of age or executive level, implemented the metacognitive rule when high- and low-memorability words were presented in two separate lists. Moreover, the results of Experiment 2 showed that participants processed medium-memorability words more conservatively when they were presented in a low- than in a high-memorability list, suggesting that children’s memorability expectations are sensitive to list-context effects. [less ▲]

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See detailInfluence of continous breeding goats on return to cyclicity in seasonal breeding goats
Prvanović, N; Vince, S; Đuričić, D et al

in Reproduction in Domestic Animals (2007), 42(2), 139

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See detailInfluence of continuous breeding goats on return to cyclicity in seasonal breeding goats
Prvanovic, N; Vince, S; Duricic, D et al

in Reproduction in Domestic Animals (2007), 42

The boer goats which originated from the South African Republic are continous breeding animals when kept in the northern hemisphere and they kidd three times in 2 years. In this study, a mixed herd was ... [more ▼]

The boer goats which originated from the South African Republic are continous breeding animals when kept in the northern hemisphere and they kidd three times in 2 years. In this study, a mixed herd was monitored to determine whether boer goats could induce return to cyclicity in sesonal breeding goats. All goats (n = 20) were pluriparous and kidded during January and February. During January a mixed group was formed (10 boer goats kept together with 10 domestic breed goats). At the same time a group of domestic breed goats (n = 12), kept in the same manner, 40 km away from the experimental group was used as controls. Blood samples were collected every 72 h to determine level of progesterone in both herds. Goats were monitored at the same time to observe for signs of oestrus. Progesterone concentrations in sera samples were determined using a RIA method. Data were analysed by ANOVA using Statistica software. We observed visual oestrus in all boer goats and in eight domestic breed goats from the mixed group during March and April. Progesterone concentrations confirmed the presence of functional corpora lutea between two visual cycles in these animals. No visual oestrus or increases in progesterone were observed in the control group of goats. In conclusion, continuous breeding boer goats induced oestrus in 80% (n = 8) of seasonal breeding goats when kept in a mixed herd. [less ▲]

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See detailInfluence of controlled immediate loading and implant design on peri-implant bone formation.
Vandamme, Katleen; Naert, Ignace; Geris, Liesbet ULg et al

in Journal of Clinical Periodontology (2007), 34(2), 172-81

AIM: Tissue formation at the implant interface is known to be sensitive to mechanical stimuli. The aim of the study was to compare the bone formation around immediately loaded versus unloaded implants in ... [more ▼]

AIM: Tissue formation at the implant interface is known to be sensitive to mechanical stimuli. The aim of the study was to compare the bone formation around immediately loaded versus unloaded implants in two different implant macro-designs. MATERIAL AND METHODS: A repeated sampling bone chamber with a central implant was installed in the tibia of 10 rabbits. Highly controlled loading experiments were designed for a cylindrical (CL) and screw-shaped (SL) implant, while the unloaded screw-shaped (SU) implant served as a control. An F-statistic model with alpha=5% determined statistical significance. RESULTS: A significantly higher bone area fraction was observed for SL compared with SU (p<0.0001). The mineralized bone fraction was the highest for SL and significantly different from SU (p<0.0001). The chance that osteoid- and bone-to-implant contact occurred was the highest for SL and significantly different from SU (p<0.0001), but not from CL. When bone-to-implant contact was observed, a loading (SL versus SU: p=0.0049) as well as an implant geometry effect (SL versus CL: p=0.01) was found, in favour of the SL condition. CONCLUSIONS: Well-controlled immediate implant loading accelerates tissue mineralization at the interface. Adequate bone stimulation via mechanical coupling may account for the larger bone response around the screw-type implant compared with the cylindrical implant. [less ▲]

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See detailInfluence of cooling rate on residual stress profile in veneering ceramic: Measurement by hole-drilling.
MAINJOT, Amélie ULg; Schajer, G. S.; Vanheusden, Alain ULg et al

in Dental materials : official publication of the Academy of Dental Materials (2011)

OBJECTIVES: The manufacture of dental crowns and bridges generates residual stresses within the veneering ceramic and framework during the cooling process. Residual stress is an important factor that ... [more ▼]

OBJECTIVES: The manufacture of dental crowns and bridges generates residual stresses within the veneering ceramic and framework during the cooling process. Residual stress is an important factor that control the mechanical behavior of restorations. Knowing the stress distribution within the veneering ceramic as a function of depth can help the understanding of failures, particularly chipping, a well-known problem with Yttria-tetragonal-zirconia-polycrystal based fixed partial dentures. The objective of this study is to investigate the cooling rate dependence of the stress profile in veneering ceramic layered on metal and zirconia frameworks. METHODS: The hole-drilling method, often used for engineering measurements, was adapted for use with veneering ceramic. The stress profile was measured in bilayered disc samples 20mm in diameter, with a 0.7mm thick metal or Yttria-tetragonal-zirconia-polycrystal framework and a 1.5mm thick veneering ceramic. Three different cooling procedures were investigated. RESULTS: The magnitude of the stresses in the surface of the veneering ceramic was found to increase with cooling rate, while the interior stresses decreased. At the surface, compressive stresses were observed in all samples. In the interior, compressive stresses were observed in metal samples and tensile in zirconia samples. SIGNIFICANCE: Cooling rate influences the magnitude of residual stresses. These can significantly influence the mechanical behavior of metal-and zirconia-based bilayered systems. The framework material influenced the nature of the interior stresses, with zirconia samples showing a less favorable stress profile than metal. [less ▲]

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See detailInfluence of copper(II) salt on the reaction of peroxynitrite with propofol
Kohnen, Stephan ULg; Mouithys-Mickalad, Ange ULg; Deby-Dupont, G. et al

in Free Radical Research (2003), 37(Suppl. 1), 106

Detailed reference viewed: 15 (2 ULg)
See detailInfluence of coral heterogenous susceptibility to warming on reef biodiversity
Ladrière, Ophélie ULg; Penin, Lucie; Adjeroud, Mehdi et al

Poster (2007)

Detailed reference viewed: 12 (0 ULg)
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See detailThe influence of core excitations on energies and oscillator strengths of iron group elements
Quinet, Pascal ULg; Hansen, J E

in Journal of Physics : B Atomic Molecular & Optical Physics (1995), 28

Detailed reference viewed: 16 (0 ULg)