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See detailIs Belgium lagging behind in sustainability management? An international empirical analysis
Crutzen, Nathalie ULg; Hoerisch, Jacob

Conference (2013, September)

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See detailIs beta-blockade necessary to obtain diagnostic image quality at low radiation dose of coronary CT angiography using a 2nd generation 320-row scanner?
Ghekiere, Olivier; Djekic, Julien; El Hachemi, Mounia et al

Conference (2014, October 02)

PURPOSE To evaluate the effect of beta-blockade on coronary computed tomography angiography (CCTA) image quality and radiation dose using a second-generation 320-row scanner. MATERIAL AND METHODS 200 ... [more ▼]

PURPOSE To evaluate the effect of beta-blockade on coronary computed tomography angiography (CCTA) image quality and radiation dose using a second-generation 320-row scanner. MATERIAL AND METHODS 200 patients (mean age 60± 3, range 20-86 years;92 females) were included in this prospective study, including 97 patients without beta-blockade and 103 patients with beta-blockade. Target heart rate (HR) in this 2nd group was < 75 bpm, enabling single heartbeat scan, the threshold for a dual heart beat scan was HR < 100 bpm. Image quality in coronary segments ≥ 1.5 mm was evaluated by 2 readers using a four-point scale from grade 1, no artifact to 4, unevaluable. Effects of radiation dose, caliber, HR, arrhythmia, age, BMI, scan length, number of heartbeat/scan, coronary stent, beta-blockade, coronary calcifications, kilovoltage(kV), tube current(mA), and signal to noise ratio(SNR), defined as the ratio between the mean attenuation and the standard deviation in the aorta of on radiation dose (mSv) and image quality were analyzed by using regression analysis. RESULTS: Image quality (grade 1 or 2) was diagnostic in 99,9% and interobserver agreement was good (κ=0,61). Regression analysis of the radiation dose (mean 1,5±0.2 mSv) shows that there is a negative impact of BMI (mean 27,1±2,0kg/m²), arrhythmia during acquisition (n =8), Agatston score, scan length, number of heart beat/scan and the age on the radiation dose, whereas vessel caliber, number of heart beat/scan, age, HR(mean 61,4 beats/min) and SNR negatively impacted the image quality (p-values < 0.05). Beta-blockade impacted neither radiation dose nor image quality (p >0.05). CONCLUSION Using a second generation 320-row scanner, beta-blockers does not result in a better coronary image quality or lower radiation dose. [less ▲]

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See detailIs bounce juggling easier in a parabolic billiard than in a wedge
Chang, Dong Eui; Ronsse, Renaud; Sepulchre, Rodolphe ULg

in Proceedings of the 5th Euromech nonlinear dynamics conference (2005)

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See detailIs brain activity during a Stroop inhibitory task modulated by the kind of cognitive control required?
Collette, Fabienne ULg; D'Ostilio, Kevin ULg; D'Argembeau, Arnaud ULg et al

Conference (2011)

Performance on the Stroop task is associated to a large antero-posterior cerebral network involving notably the anterior cingulate and dorsolateral prefrontal cortex. In this study, we used a mixed-BOLD ... [more ▼]

Performance on the Stroop task is associated to a large antero-posterior cerebral network involving notably the anterior cingulate and dorsolateral prefrontal cortex. In this study, we used a mixed-BOLD-fMRI design (N=25) to determine the neural substrates of inhibitory functioning in a Stroop task according to contextual information. Consequently, two task-contexts were created: (1) congruent context with a majority of facilitator items, (2) non-congruent context with mainly interfering items. Based on the dual cognitive control model, we postulated that the non-congruent blocks will involve proactive control, which is anticipatory, sustained, and involved when a large number of interfering items are successively presented. On the contrary, congruent blocks were assumed to involve reactive control, which occurs when few interfering items are presented, and just after the presentation of these items only. On this basis, we hypothesized that the kind of cognitive control modulates cerebral activity associated to inhibitory functioning. For behavioral data, we obtained faster response times for interfering items in the non-congruent vs. congruent condition, indicating proactive control specific to the congruent condition only. Functional neuro-imaging data showed an increased transient activity for interfering vs neutral items in a fronto-parietal network more important in the congruent than in the neutral condition. A similar contrast in the non-congruent condition showed no significant brain activity at the statistical threshold used. These data indicate the existence of a modulation of the cerebral areas associated to inhibitory functioning according to the kind of cognitive control necessary to perform the task. [less ▲]

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See detailIs brain estradiol a hormone or a neurotransmitter?
Balthazart, Jacques ULg; Ball, G. F.

in Trends in Neurosciences (2006), 29(5), 241-249

Mounting evidence indicates that, besides their well-known hormonal mode of action at the genetic level, estrogens such as 17 beta-estradiol also influence brain function by direct effects on neuronal ... [more ▼]

Mounting evidence indicates that, besides their well-known hormonal mode of action at the genetic level, estrogens such as 17 beta-estradiol also influence brain function by direct effects on neuronal membranes. Experimentally induced rapid changes in estradiol bioavailability in the brain have been shown to alter the expression of male sexual behavior significantly within minutes - probably too quickly to be accounted for by conventional genetic mechanisms. In parallel, recent studies indicate that aromatase, the enzyme that converts testosterone to estradiol in the brain, is expressed in presynaptic terminals and modulated within minutes by Ca2+-dependent phosphorylation. In this article, we develop the hypothesis that brain estrogens display many, if not all, functional characteristics of neuromodulators or even neurotransmitters. [less ▲]

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See detailIs Büchi's theorem useful for you?
Rigo, Michel ULg

Conference (2015, May 28)

Almost a century ago, Presburger showed that the first order theory of the natural numbers with addition is decidable. Following the work of Büchi in 1960, this result still holds when adding a function ... [more ▼]

Almost a century ago, Presburger showed that the first order theory of the natural numbers with addition is decidable. Following the work of Büchi in 1960, this result still holds when adding a function $V_k$ to the structure, where $V_k(n)$ is the largest power of $k\ge 2$ diving $n$. In particular, this leads to a logical characterization of the $k$-automatic sequences. During the last few years, many applications of this result have been considered in combinatorics on words, mostly by J. Shallit and his coauthors. In this talk, we will present this theorem of Büchi where decidability relies on finite automata.Then we will review some results about automatic sequences or morphic words that can be proved automatically (i.e., the proof is carried on by an algorithm). Finally, we will sketch the limitation of this technique. With a single line formula, one can prove automatically that the Thue-Morse word has no overlap but, hopefully, not all the combinatorial properties of morphic words can be derived in this way. [less ▲]

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See detailIs canine eosinophilic bronchopneumopathy an asthmatic disease ?
Clercx, Cécile ULg

in 12th ESVIM Meeting - Münich - Allemagne (2002, September)

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See detailIs chronic migraine a never-ending migraine attack?
Schoenen, Jean ULg

in Pain (2011), 152(2), 239-40

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See detailIs conspecific substrate marking a long-term external memory of previously colonized overwintering sites in Harmonia axyridis?
Durieux, Delphine ULg; Fassotte, Bérénice ULg; Vanderplanck, Maryse et al

in Journal of Applied Entomology (2014), 138(5), 338-345

The multicoloured Asian ladybeetle, Harmonia axyridis (Pallas), aggregates inside dwellings during winters to survive the cold. This beetle uses chemical cues coming from congeners to select an ... [more ▼]

The multicoloured Asian ladybeetle, Harmonia axyridis (Pallas), aggregates inside dwellings during winters to survive the cold. This beetle uses chemical cues coming from congeners to select an overwintering site. Recent research has shown that they preferentially gather at places where conspecifics previously laid a substrate marking made up of saturated and unsaturated hydrocarbons. Some authors have reported that H. axyridis colonizes the same overwintering sites from 1 year to another. Herein, the hypothesis that this substrate marking is used by H. axyridis to settle in the same aggregation sites from one winter to another was tested. To this aim, the temporal modification in the chemical profile of the hydrocarbon marking was studied by performing chromatographic analyses. After 1 year, the overall profile was modified qualitatively and quantitatively: the unsaturated hydrocarbons were no longer detected while some saturated hydrocarbons were still present in large quantities. In a behavioural assay conducted in the laboratory, the 12-month-old marking did not induce the aggregation of H. axyridis. This result indicates that the chemical markings left by conspecifics during a previous aggregation period in an overwintering site are not sufficient to induce the gathering of the newly arriving individuals. [less ▲]

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See detailIs Contact Between Conspecifics Involved in the Cohesion of Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) Aggregations?
Durieux, Delphine ULg; Fassotte, Bérénice ULg; Fischer, Christophe ULg et al

in Journal of Insect Behavior (2014), 27(1), 1-13

The multicolored Asian ladybeetle, Harmonia axyridis (Pallas), exhibits a gregarious behavior during unfavorable winter conditions. Although this behavior is currently described as a phenomenon occurring ... [more ▼]

The multicolored Asian ladybeetle, Harmonia axyridis (Pallas), exhibits a gregarious behavior during unfavorable winter conditions. Although this behavior is currently described as a phenomenon occurring only during winter, aggregations can also be observed outside overwintering conditions. However, the substrate markings previously highlighted as being involved in the wintry aggregation of this exotic species do not seem to be used by non-overwintering individuals to aggregate. This fact suggests then that other cues are responsible for the induction of this behavior. In this work, we have tested the hypothesis that direct contact between non-overwintering individuals stimulates the establishment of clusters. Binary choice experiments highlighted the involvement of elytral cuticular compounds in this phenomenon. Chromatographic analyses showed that the active extracts contained mainly hydrocarbons, including saturated, mono-unsaturated, and di-unsaturated homologues. Physical contact also seems to be involved in the non-overwintering aggregative behavior of H. axyridis, but to a lesser extent than these natural compounds. These findings could eventually be used to develop new control methods of these pest populations and so, reduce the adverse impacts it causes on biodiversity. [less ▲]

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See detailIs Counter-Discursive Criticism Obsolescent? Intertextuality in Caryl Phillips's Higher Ground
Ledent, Bénédicte ULg

in Maes-Jelinek, Hena; Collier, Gordon; Davis, Geoffrey V. (Eds.) A Talent(ed) Digger: Creations, Cameos, and Essays in Honour of Anna Rutherford (1996)

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See detailIs cystatin C useful for the detection and the estimation of low glomerular filtration rate in heart transplant patients?
Delanaye, Pierre ULg; Nellessen, Eric ULg; Cavalier, Etienne ULg et al

in Transplantation (2007), 83(5), 641-644

Although previously studied in patients with chronic kidney disease, there is less data for the use of cystatin C and cystatin C-based formulas in heart transplant recipients. The ability of creatinine ... [more ▼]

Although previously studied in patients with chronic kidney disease, there is less data for the use of cystatin C and cystatin C-based formulas in heart transplant recipients. The ability of creatinine and cystatin C to detect renal failure (glomerular filtration rate [GFR] below 60 mL/min/1.73 m(2)) in heart transplant patients has been compared. The accuracy and precision of a creatinine-based formula (Modification of Diet in Renal Disease [MDRD]) versus a cystatin C-based formula (Rule's formula) to estimate GFR have also been studied. GFR was measured using the (51)Crethylenediamine tetraacetic acid tracer in 27 patients. There was no significant difference between GFR and the reciprocal of creatinine or cystatin C. Receiver operating characteristic curves for cystatin C and creatinine were similar. Both formulas were well correlated with the GFR. The bias of the cystatin C-based was significantly better than one of the MDRD formula, but the standard deviation appeared better for the MDRD formula (bias of +3.9 mL/min/1.73 m(2) versus +12 mL/min/1.73 m(2) and SD of 8.5 versus 11.6, respectively). Plasma cystatin C has no clear advantage over serum creatinine to detect renal failure in heart transplanted patients. [less ▲]

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See detailIs dark matter made of mirror matter? Evidence from cosmological data
Ciarcelluti, Paolo; Wallemacq, Quentin ULg

in Physics Letters B (2014), 729

We present new fast numerical simulations of cosmic microwave background and large scale structure in the case in which the cosmological dark matter is made entirely or partly of mirror matter. We ... [more ▼]

We present new fast numerical simulations of cosmic microwave background and large scale structure in the case in which the cosmological dark matter is made entirely or partly of mirror matter. We consider scalar adiabatic primordial perturbations at linear scales in a flat Universe. The speed of the simulations allows us for the first time to use Markov Chain Monte Carlo analyses to constrain the mirror parameters. A Universe with pure mirror matter can fit very well the observations, equivalently to the case of an admixture with cold dark matter. In both cases, the analyses show a clear indication of the presence of a consistent amount of mirror dark matter, 0.05 < Ω_{mirror} h^2 < 0.12. [less ▲]

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See detailIs Darwin's 'Abominable Mystery' still a mystery today?
Cascales-Miñana, Borja ULg; Cleal, Chris J.; Gerrienne, Philippe ULg

in Cretaceous Research (2016), 61

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See detailIs dit Belgisch? C'est du belge! De invloed van tabloidisering op get wederzijdse beeld van Vlamingen en Franstaligen in twee Belgische kwaliteitskranten
Hiligsmann, Philippe; Stoffel, Sophie; Rasier, Laurent ULg

in Sergier, Matthieu; Vanasten, Stéphanie (Eds.) Literaire belgitude littéraire. Bruggen en beelden / Vues du Nord (2011)

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See detailIs dolphin morbillivirus virulent for white-beaked dolphins (Lagenorhynchus albirostris)?
van Elk, N.; van de Bildt, M.; Jauniaux, Thierry ULg et al

in Veterinary Pathology (2014)

Detailed reference viewed: 36 (4 ULg)