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Peer Reviewed
See detailPréservation de la reconnaissance basée sur la familiarité chez un patient amnésique
Bastin, Christine ULg; Van der Linden, Martial ULg; Charnallet, Annick et al

Poster (2002, May 24)

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See detailPréservation de la thymopïèse dans le grand âge
RICOUR, Céline ULg; de saint hubert, Marie; Martens, Henri ULg et al

Poster (2014)

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See detailPréservation des modes rigides et conditions sur les déplacements au voisinage de l'axe dans les coques tron-coniques de révolution
Debongnie, Jean-François ULg

Report (1975)

The classical approach of the shell theory proceeds as follows. After an exact development of the strain expressions, one neglects any term containing the factor h/R. But this method destruct the exact ... [more ▼]

The classical approach of the shell theory proceeds as follows. After an exact development of the strain expressions, one neglects any term containing the factor h/R. But this method destruct the exact representation of rigid body modes. An alternative to this procedure is presented here, where special care is given to the preservation of the rigid body modes. The second part of this report is focused on the necessary conditions on the displacements on the axis. This study is based on the fact that the strains have to remain finite values. [less ▲]

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See detailPreservation of Cortical Microcirculation after Kidney Ischemia-Reperfusion: Value of an Iron Chelator
Defraigne, Jean-Olivier ULg; Pincemail, Joël ULg; Detry, Olivier ULg et al

in Annals of Vascular Surgery (1994), 8(5), 457-67

Treatment of suprarenal aneurysms and renal artery reconstructions are both responsible for normothermic ischemia of the kidney (during clamping) followed by reperfusion (declamping). During reflow ... [more ▼]

Treatment of suprarenal aneurysms and renal artery reconstructions are both responsible for normothermic ischemia of the kidney (during clamping) followed by reperfusion (declamping). During reflow through an organ undergoing ischemia the production of free radicals can be associated with cell injury and a no-reflow phenomenon characterized by perfusion defects after a period of transient hyperemia. The objectives of this study were to demonstrate the existence of this phenomenon in the kidney undergoing ischemia followed by reperfusion and to test the potential protection afforded by an iron chelator (desferrioxamine) since free radical reactions are catalyzed by iron. Adult New Zealand white rabbits were divided into the following three groups: group A, 15 minutes of ischemia plus 10 minutes of reperfusion; group B, 60 minutes of ischemia plus 10 minutes of reperfusion; and group C, 60 minutes of ischemia plus 10 minutes of reperfusion combined with infusion of desferrioxamine (50 mg/kg). Cortical microcirculation in the kidney was measured by laser Doppler flowmeter before ischemia and 1, 5, and 10 minutes after reperfusion. Vitamin E content was determined in the cortex of the left kidney after 10 minutes of reperfusion and compared with that of the right (control) kidney. After 1 minute of reperfusion the cortical microcirculatory flow was significantly increased in all three groups (reactive hyperemia). In groups A and C blood flow returned to preclamping values after 10 minutes of reperfusion; however, blood flow in group B remained significantly reduced (29.2% +/- 10.5%) after 5 minutes of reperfusion with a further reduction to 48.5% +/- 5.7% after 10 minutes. These findings were correlated with the dosage of vitamin E since the vitamin E content was greatly reduced by 46.7% +/- 7.8% in group B but did not change significantly in groups A and C. This study shows that 60 minutes of normothermic ischemia is followed by a significant reduction in cortical microcirculatory flow (no-reflow phenomenon). Infusion of an iron chelator (desferrioxamine), however, which decreases the intensity of lipid peroxidation induced by the free radicals, preserves the microcirculatory flow. [less ▲]

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See detailPreservation of normal morphology of human livers afte 24-hours of hypothermic machine perfusion: a first-in-man study
Monbaliu, D.; Liu, Q.; Libbrecht, L. et al

Conference (2011, March 24)

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See detailPRESERVATION OF NORMAL MORPHOLOGY OF HUMAN LIVERS AFTER 24 HOURS OF HYPOTHERMIC MACHINE PERFUSION. A FIRST-IN-MAN STUDY
Monbaliu, D.; Liu, Q.; Libbrecht, L. et al

in Transplant International (2011, September), 24(2), 151-151

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See detailPreservation of Oocyte and Granulosa Cell Morphology in Bovine Preantral Follicles Cultured in Vitro
Figueiredo, J. R.; Hulshof, S. C.; Van den Hurk, R. et al

in Theriogenology (1994), 41(6), 1333-46

Described in the present paper is a culture system that preserves oocyte and granulosa cell morphology in bovine preantral follicles during 5 d in vitro. The effects of additional hypoxanthine and energy ... [more ▼]

Described in the present paper is a culture system that preserves oocyte and granulosa cell morphology in bovine preantral follicles during 5 d in vitro. The effects of additional hypoxanthine and energy substrata (i.e., pyruvate and glutamine) on the morphology of cultured preantral follicles were investigated. It was shown that addition of a mixture of pyruvate, glutamine and hypoxantine to the culture medium increased the percentage of follicles with an intact oocyte from 29.4 to 78.6%. Morphological criteria are described to discriminate between normal and degenerated preantral follicles during culture by inverted microscopy. In addition, the importance of histological evaluation to judge the quality of oocyte and granulosa cells is demonstrated. [less ▲]

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See detailPreservation of pulsory and migratory activities of rat Schwann cells before and after mitotic stimulation
Rentier, Bernard ULg; Dubois-Dalq, Monique; Baron-Van Evercooren, A.

in Abstracts - Society for Neuroscience (1980)

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See detailPreservation of vinegar acetic acid bacteria
Ndoye, B.; Ceenwerck, I.; Destain, Jacqueline ULg et al

in Vinegars of the world (2008)

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See detailPreservation practices and quality perception of shrimps along the local merchandising chain in Benin
Kpoclou, Euloge; Anihouvi, Victor; Scippo, Marie-Louise ULg et al

in African Journal of Agricultural Research (2013), 8(26), 3405-3414

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See detailPreserved artificial grammar learning in Parkinson's disease
Meulemans, Thierry ULg; Peigneux, Philippe ULg; Van der Linden, Martial ULg

in Brain & Cognition (1998), 37(1), 109-112

Parkinson's disease (PD) patients and matched control subjects were compared in an artificial grammar learning task. The test strings were constructed in such a way that grammaticality judgments could not ... [more ▼]

Parkinson's disease (PD) patients and matched control subjects were compared in an artificial grammar learning task. The test strings were constructed in such a way that grammaticality judgments could not be based on some superficial features of the learning strings: the grammatical and nongrammatical test strings did not differ according to different measures of chunk strength (based on the frequency with which their bigrams and trigrams appear in the learning strings). Results show that PD patients and controls performed at the same level during the first presentation of the test strings series, which suggests that the striatum is not (crucially) implicated in the ability to abstract rules implicitly from exemplars generated by a finite-state grammar. However, and contrary to control subjects, the classification performance of PD patients was at chance during the second presentation of the test strings. We argue that this latter result could be the consequence of the attentional deficit of PD patients. [less ▲]

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See detailPreserved automatic inhibition effect after 1 Hz repetitive transcranial magnetic stimulation over the supplementary motor area
D'Ostilio, Kevin ULg; CREMERS, Julien ULg; DELVAUX, Valérie ULg et al

Poster (2013)

Background: It is widely accepted that medial frontal regions are involved in voluntary action control. Indeed, Sumner et al. (2007) have recently suggested that one of the mechanisms through which the ... [more ▼]

Background: It is widely accepted that medial frontal regions are involved in voluntary action control. Indeed, Sumner et al. (2007) have recently suggested that one of the mechanisms through which the supplementary motor area (SMA) contributes to voluntary control is automatic and unconscious motor inhibition. In this study, they administered a visuo-motor subliminal masked prime task (Eimer & Schlaghecken, 2003) to two patients with micro-lesions of the SMA and demonstrated an absence of automatic and unconscious inhibition as evoked by masked prime stimuli. This finding has been supported by neuroimaging data (D'Ostilio et al., 2012). Here, the aim of our research was to corroborate this result by means of a “virtual lesion” approach. Methods: For this purpose, we examined the effects of 1 Hz rTMS (train of 20 min; stimulus intensity 120 % of resting motor threshold) over the SMA of ten healthy volunteers, previously localized by functional magnetic resonance imaging (fMRI), on reaction time (RT) performance in the subliminal masked prime task. The functional localizer experiment consisted of four blocks of sequential finger tapping and 15 s of rest after each block. Imaging data were analyzed with SPM 8 and then were imported into the Brainsight software version 2.1.5. With such system, we were able to navigate across the subjects’ brain. The peak voxel in the SMA for each subject (at a statistical threshold of p < 0.05 uncorrected) was used as a target point for the rTMS session. Results: The mean motor threshold was 50.9 % of maximal stimulator output (SD: ± 4.86 %). Wilcoxon tests showed a significant effect of compatibility on RTs (sham: Z = 2.7, p = 0.007; rTMS: Z = 2.8, p = 0.005) and accuracy rate (sham: Z = 2.5, p = 0.01; rTMS: Z = 2.1, p = 0.03), subjects being slower and making more errors in compatible trials (sham: 391.64 ± 52 ms, 87.3 % of accuracy; rTMS: 396.66 ± 37 ms, 86.3 % of accuracy) in comparison to incompatible trials (sham: 357.45 ± 36 ms, 92.5 % of accuracy; rTMS: 356.25 ± 28 ms, 92.7 % of accuracy), suggesting motor inhibition. However, this NCE was preserved after rTMS over the SMA (RTs: Z = 0.87, p = 0.39; accuracy rate: Z = 0.71, p = 0.47). Conclusions: We conclude that long trains of low intensity 1 Hz rTMS did not affect the modulation of RT by subliminal stimuli, suggesting that the SMA might not be mandatory for the implementation of this automatic process. The limitation of this study is relative to the neural efficacy argument because we are not sure that TMS was strong enough to disturb the redundant organizational processing in the SMA or that other regions were not able to compensate for the virtually lesioned area. [less ▲]

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See detailPreserved familiarity-based recognition memory in a case of global amnesia
Bastin, Christine ULg; Van der Linden, Martial ULg; Charnallet, Annik et al

in Journal of Cognitive Neuroscience (2002), 14(Supplemental), 32

Whether recognition memory can be preserved relative to recall in global amnesia is a matter of debate. Some studies suggest that amnesic patients with selective lesion to the hippocampal circuit show a ... [more ▼]

Whether recognition memory can be preserved relative to recall in global amnesia is a matter of debate. Some studies suggest that amnesic patients with selective lesion to the hippocampal circuit show a relatively normal recognition memory in the presence of impaired recall. However, other findings did not support this assumption. We investigated the recognition memory performance of a patient (ER) who became amnesic following a carbon monoxide poisoning. The MR scan revealed bilateral lesions to the pallidum. Based on the aetiology, a hippocampal lesion is suspected, but needs to be confirmed by a volumetric analysis. The recall and recognition performance of the patient was tested by means of the nonverbal subtests of the Doors and People Test Battery, which were matched on difficulty. On these subtests, ER’s recall performance was much more impaired than his recognition memory. ER’s recognition memory performance was further examined on a yes-no and a forced-choice recognition memory task, using faces as material. On the yes-no task, ER’s hit rate was normal, but he made a lot of false alarms compared to control subjects. By contrast, his forced-choice recognition memory was completely normal. This suggests that ER is able to use the familiarity process to make recognition decisions. Familiarity and recollection were finally investigated with a recognition task using the Process Dissociation Procedure (Jacoby, 1991). On this task, ER’s familiarity score was normal, whereas his recollection score was lower. These results support the assumption that familiarity-based recognition memory can be preserved in amnesia. [less ▲]

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See detailPreserved feedforward but impaired top-down processes in the vegetative state.
Boly, Mélanie ULg; Garrido, Marta Isabel; Gosseries, Olivia ULg et al

in Science (2011), 332(6031), 858-62

Frontoparietal cortex is involved in the explicit processing (awareness) of stimuli. Frontoparietal activation has also been found in studies of subliminal stimulus processing. We hypothesized that an ... [more ▼]

Frontoparietal cortex is involved in the explicit processing (awareness) of stimuli. Frontoparietal activation has also been found in studies of subliminal stimulus processing. We hypothesized that an impairment of top-down processes, involved in recurrent neuronal message-passing and the generation of long-latency electrophysiological responses, might provide a more reliable correlate of consciousness in severely brain-damaged patients, than frontoparietal responses. We measured effective connectivity during a mismatch negativity paradigm and found that the only significant difference between patients in a vegetative state and controls was an impairment of backward connectivity from frontal to temporal cortices. This result emphasizes the importance of top-down projections in recurrent processing that involve high-order associative cortices for conscious perception. [less ▲]

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See detailPréserver l'égalité des chances
Durand, Pascal ULg

Article for general public (1995)

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See detailPreserver le fonctionnement du cerveau...par la pratique d'une activite physique?
Garraux, Gaëtan ULg

in Revue Médicale de Liège (2008), 63(5-6), 293-8

Over the last few years, there has been an increasing interest in the relationship between brain function and physical exercise. Preliminary evidence from observational and interventional studies in ... [more ▼]

Over the last few years, there has been an increasing interest in the relationship between brain function and physical exercise. Preliminary evidence from observational and interventional studies in humans suggests a positive and robust effect of chronic aerobic exercise on several brain functions across the entire lifespan. Physical activity and exercise might also serve to reduce the risk of age-associated neurological disorders such as Alzheimer's and Parkinson's diseases. The mechanisms underlying these beneficial effects remain poorly understood. More scientific work is needed before disseminating more specific recommendations to the general population. [less ▲]

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See detailPréserver les écosystèmes forestiers naturels
Dufrêne, Marc ULg; Jacquemart, Anne-Laure

in Louvain : Revue Mensuelle de l'Université Catholique de Louvain et de l'Association des Anciens et Amis de l'UCL (2011), 188

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See detailPréserver plutôt que reconstruire
LAMBERT, France ULg

Conference (2012, January 13)

Chacun d’entre nous est familier avec la résorption typique de la crête alvéolaire après l’extraction d’une dent et particulièrement dans le secteur esthétique. Cette perte de tissus, entraîne fréquemment ... [more ▼]

Chacun d’entre nous est familier avec la résorption typique de la crête alvéolaire après l’extraction d’une dent et particulièrement dans le secteur esthétique. Cette perte de tissus, entraîne fréquemment la nécessité de reconstructions tissulaires élaborées afin de restaurer la ou les dents extraite(s). Cet exposé vise à évaluer le bénéfice des gestions des alvéoles d’extraction avec l’utilisation de biomatériaux et de la chirurgie muquo-gingivale, afin de limiter les pertes tissulaires post- extractionnelles. Les principes biologiques de ce protocole seront décrits par le biais des résultats des études cliniques réalisées au seins de notre université, et illustré par des cas cliniques. [less ▲]

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