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See detailThe Impact of Dual-Tasking on Sentence Comprehension in Children with Specific Language Impairment
Leclercq, Anne-Lise ULg; Majerus, Steve ULg; Prigent, Gaïd ULg et al

in Journal of Speech, Language, and Hearing research (2013), 56

Purpose: This study assesses the hypothesis of a limitation in attentional allocation capacity as underlying poor sentence comprehension in children with SLI. Method: Fifteen children with SLI, 15 age ... [more ▼]

Purpose: This study assesses the hypothesis of a limitation in attentional allocation capacity as underlying poor sentence comprehension in children with SLI. Method: Fifteen children with SLI, 15 age-matched controls, and 15 grammar-matched controls. Sixty sentences were presented in isolation, and 60 sentences were presented with a concurrent non-linguistic target-detection task. If poor attentional allocation capacity is a core deficit in SLI, they should be impaired to a greater extent in the dual task condition relative to the grammatical-age controls. On the contrary, a comparable performance decrement under the dual-task condition in children with SLI and younger language controls would attest of a limitation in attentional allocation capacity in children with SLI that is not disproportionate to their language level. Results: Sentence comprehension was affected by the dual-task condition to a greater extent in children with SLI relative to age-controls, but not relative to grammatical-controls. Conclusions: Our study does not support limitations in attentional allocation capacity as representing a core deficit in SLI. Rather, our data show that these children show attentional allocation capacity comparable to that of younger children having similar language level, suggesting that SLI is characterized by a slowed development of both attentional and language domains. [less ▲]

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See detailThe Impact of Dual-Tasking on Verbal Short-Term Memory in Children with Specific Language Impairment
Leclercq, Anne-Lise ULg; Maillart, Christelle ULg; Lange, Manon et al

Poster (2014, June)

Limitations in general processing capacities have been proposed to account for poor verbal short-term memory (STM) performances in children with SLI. Previous studies observed that STM performances ... [more ▼]

Limitations in general processing capacities have been proposed to account for poor verbal short-term memory (STM) performances in children with SLI. Previous studies observed that STM performances decreased to a larger extent in children with SLI as compared to their unaffected peers when the processing demands of the task increased (e.g., Ellis Weismer, et al., 2005; Montgomery, 2000a,b). However, in these studies, the increase in attention processing demands went with an increase in linguistic processing demands. Since children with SLI experience language processing problems, it is not clear whether general attention problems or language processing problems are at the root of their larger performance decrease as compared to their unaffected peers. This study aims at directly assessing the hypothesis that limitations in general attentional capacity are at the root of poor STM performances in children with SLI, using an attention demanding visual search task administered concurrently with nonword repetition task. Twenty-three children with SLI, 23 age-matched children, and 23 nonword span-matched children performed immediate serial recall tasks of nonwords. The STM lists were presented either alone or concurrently with the target detection task. Moreover, the target detection task either stopped or continued when children had to recall the nonwords. Results show a main effect of dual task condition on both nonword repetition accuracy and target detection accuracy. Performances in children with SLI were not more affected than in controls by the necessity to perform a concurrent visual attention task during nonword lists presentation. However, nonword recall seemed to be more challenging for children with SLI than for age-matched controls. Indeed, performances in the visual task were lower in children with SLI than in their age-matched controls, but not as compared to nonword span-matched controls. [less ▲]

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See detailImpact of dust processes on air quality in Niamey, Niger, and consequences on human health
Ozer, Pierre ULg

in Gabriels, Donald; Cornelis, Wim M.; Eyletters, Murielle (Eds.) et al Combating desertification: Assessment, adaptation and mitigation strategies (2008)

It is now irrefutable that air pollution caused by large amounts of respiratory particulates (Particulate Matter less than 10 µm in aerodynamic diameter, PM10) has numerous undesired consequences on human ... [more ▼]

It is now irrefutable that air pollution caused by large amounts of respiratory particulates (Particulate Matter less than 10 µm in aerodynamic diameter, PM10) has numerous undesired consequences on human health. Although air quality degradation far away from the African continent in the US and in Europe caused by high concentration of African dust is seen as a major health threat although most of these countries are very distant from the Sahara; no estimates of PM10 levels near the Saharan dust source are available. Based on horizontal visibility observations which are reduced by the presence of dust in the atmosphere, PM10 levels are estimated during 2005 at Niamey-Airport, Niger. It appears that excessive concentrations of particles are very important both in magnitude and frequency as the 24-hour PM10 thresholds established by the US EPA National Ambient Air Quality Standards and the EU Limits Values for Air Quality were exceeded 103 and 67 times, respectively. The average yearly concentration is far above air quality standards and estimated to 92 µg m-3 for PM10. These very high particulate levels are likely to represent an important public health threat and should be considered as a major environmental risk. [less ▲]

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See detailImpact of early versus late acquired blindness on the fuctional organization and connectivity of the occipital cortex
Collignon, O; Phillips, C; Dormal, G et al

Poster (2012, May)

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See detailImpact of elevated pCO2 on optical properties of the coccolithophorid Emiliania huxleyi grown under nitrate limitation
Denis, Michel; Sciandra, Antoine; Harlay, Jérôme ULg et al

Conference (2003, April 06)

Side scatter and red fluorescence properties of the coccolithophore Emiliania huxleyi were investigated when NO3-limited continuous cultures were submitted to a CO2 partial pressure (pCO2) increase from ... [more ▼]

Side scatter and red fluorescence properties of the coccolithophore Emiliania huxleyi were investigated when NO3-limited continuous cultures were submitted to a CO2 partial pressure (pCO2) increase from 400 to 700 ppm. Cultures renewed at the rate of 0.5 d-1 and were submitted to saturating light level. pCO2 was controlled by bubbling CO2-rich or CO2- free air in the cultures. Side scatter of a single cell is considered to reflect not only its overall shape but mainly its inner structure and content through a complex combination of optical properties including absorption, diffusion, refractive index and refraction. Consequently, the cultures of Emiliania huxleyi were monitored by flow cytometry to detect possible changes in its optical properties at the single cell level under the effect of CO2 doubling in the atmospheric phase. The average SD for counting 5 replicates was less than 1.6% over the period of the study. It was 0.1 and 0.2% for fluorescence and side scatter respectively. Considering the possible decalcification induced by the increase of CO2 in the chemostat atmosphere, the maximum variation that can be expected for side scatter is that provided by the coccolith depletion upon acidification of the cell suspension. The acidification induced a large (36%) decrease of the side scatter signal as expected and had no detectable effect on the red fluorescence. To validate the assignment of this change on coccolith dissolution, the same experiment was repeated with a culture of a non-calcifying species, Dunaliella tertiolecta. The acidification of D. tertiolecta suspension induced no detectable change, both on fluorescence and side scatter. During the time of the experiment, the decline of side scatter never approached the potential 36% change observed when coccoliths are fully dissolved. Interestingly, the specific chl a fluorescence of E. huxleyi slightly increased during the period of high CO2 level. At the end of the experiment this increase amounted to 2.8% of the initial signal. The average SD of red fluorescence being 0.1%, this increase must be considered as significant. Furthermore, it progressed linearly with time over the period of observation. However, the experiment did not last enough to know if the fluorescence increase had already reached its maximum value. The acidification experiment supported the use of side scatter as a relevant parameter to trace potential changes in calcification. Since the estimated 25% decrease in calcification induced by the rise in CO2 atmosphere did not result in dramatic changes in side scatter values, we can conclude that the number of coccoliths and the overall shape and granulosity of cells was not significantly affected by this decrease. Changes must have only affected tiny structure details of the coccoliths like those observed on published electron micrographs. The small but significant increase of the fluorescence signal can be considered as a physiological response to the CO2 rise. This suggests a more dynamic photosynthetic process that would result in a higher rate of organic matter production providing that the system is not nutrient limited as in the present situation. [less ▲]

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See detailThe impact of enantioseparation techniques on the development and use of chiral drugs - Preface
Chankvetadze, B.; Crommen, Jacques ULg

in Journal of Pharmaceutical & Biomedical Analysis (2002), 27(3-4), 355-355

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See detailThe Impact of Energy on the Cost of Transport by Inland Waterways: a, Example of Bulk Transport
Marchal, Jean ULg; Planchar, R.; Potier, G.

in Proceedings of the "International Seminar on "Energy Efficiency in Land Transport", Luxembourg, Congrès sur invitation de la C.E.E (1988)

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See detailImpact of energy supply and oxygen transfer on selective lipopeptide production by Bacillus subtilis BBG21.
Fahim, Sameh; Dimitrov, Krasimir; Gancel, Frederique et al

in Bioresource technology (2012), 126

The influence of power dissipation and volumetric oxygen transfer coefficient k(L)a on Bacillus subtilis productivity of lipopeptides surfactin and fengycin was studied in shake flasks in view of scaling ... [more ▼]

The influence of power dissipation and volumetric oxygen transfer coefficient k(L)a on Bacillus subtilis productivity of lipopeptides surfactin and fengycin was studied in shake flasks in view of scaling-up of this fermentation process. The experiments performed with different flask sizes, relative filling volumes, and shaking frequencies confirmed clearly that lipopeptide production changed in function of power dissipation, via interfacial gas-liquid contact surface and oxygen supply. It was demonstrated that k(L)a is the key parameter controlling the productivity and the selectivity of the bioreaction. Varying the oxygen transfer conditions, the synthesis could be oriented to mixed production or to surfactin mono-production. The fraction of surfactin towards total lipopeptides produced and the maximal surfactin production both increased with k(L)a increase (surfactin concentration about 2 g L(-1) at k(L)a=0.04-0.08 s(-1)), while the maximal fengycin production (fengycin concentration about 0.3 g L(-1)) was obtained at moderate oxygen supply (k(L)a=0.01 s(-1)). [less ▲]

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See detailImpact of erythropoietic activity on red cell parameters in chronic renal failure patients.
Bovy, Christophe ULg; Krzesinski, Jean-Marie ULg; Gothot, André ULg et al

in Haematologica (2004), 89(6), 748-9

We measured red cell parameters during recombinant human erythropoietin (rHuEPO) therapy associated with appropriate iron supplementation in chronic hemodialysis patients. Increased erythropoietic ... [more ▼]

We measured red cell parameters during recombinant human erythropoietin (rHuEPO) therapy associated with appropriate iron supplementation in chronic hemodialysis patients. Increased erythropoietic activity led to a bias in red cell parameter determination. The percentage of hypochromic red blood cells, usually used as the most effective predictor of response to iron supplementation, increased following the appearance of a younger red cell population since the same Hb content in these younger, larger cells gives a lower Hb concentration. [less ▲]

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See detailImpact of exercise pulmonary hypertension on postoperative outcome in primary mitral regurgitation.
Magne, Julien; Donal, Erwan; Mahjoub, Haifa et al

in Heart (British Cardiac Society) (2014)

AIMS: The management of asymptomatic patients with mitral regurgitation (MR) remains controversial. Exercise-induced pulmonary hypertension (ExPHT) was recently reported as a strong predictor of rapid ... [more ▼]

AIMS: The management of asymptomatic patients with mitral regurgitation (MR) remains controversial. Exercise-induced pulmonary hypertension (ExPHT) was recently reported as a strong predictor of rapid onset of symptoms. We hypothesised that ExPHT is a predictor of postoperative cardiovascular events in patients with primary MR. METHODS AND RESULTS: One hundred and two patients with primary MR, no or mild symptoms (New York heart association (NYHA) </=2), and no LV dysfunction/dilatation, were prospectively recruited in 3 centres and underwent exercise-stress echocardiography. The presence of ExPHT was defined as an exercise systolic pulmonary arterial pressure >60 mm Hg. All patients were closely followed up and operated on when indication for surgery was reached. Postoperative events were defined as the occurrence of atrial fibrillation (AF), stroke, cardiac-related hospitalisation or death. Among the 102 patients included, 59 developed ExPHT (58%). These patients were significantly older than those without ExPHT (p=0.01). During a mean postoperative follow-up of 50+/-23 months, 28 patients (26%) experienced a predefined cardiovascular event. Patients with ExPHT had significantly higher rate of postoperative events (39% vs 12%, p=0.005); the rate of events was still higher in these patients (32% vs 9%, p=0.013), even when excluding early postoperative AF (ie, within 48 h). Event-free survival was significantly lower in the ExPHT group (all events: 5-year: 60+/-8% vs 88+/-5%, p=0.007, events without early AF: 5-year: 67+/-7% vs 90+/-4%, p=0.02). Using Cox multivariable analysis, ExPHT remained independently associated with higher risk of postoperative events in all models (all p</=0.04). CONCLUSIONS: ExPHT is associated with increased risk of adverse cardiac events following mitral valve surgery in patients with primary MR. [less ▲]

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See detailThe impact of expectations on commitment of newcomers.
Bertrand, Françoise ULg; Tibbax, V.; Hansez, Isabelle ULg

Conference (2009, November 05)

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See detailThe impact of expertise on the capture of sketched intentions: perspectives for remote cooperative design
Sutera, Jennifer; Yang, Maria C.; Elsen, Catherine ULg

in Lecture Notes in Computer Science (2014), 8683

The paper describes the way expertise and field-knowledge can impact the transfer of graphical intentions during architectural cooperative design. The analysis of 28 controlled experiments reveals what ... [more ▼]

The paper describes the way expertise and field-knowledge can impact the transfer of graphical intentions during architectural cooperative design. The analysis of 28 controlled experiments reveals what matters in transmitting architectural intents and more specifically underlines how novices’ intuitive, deductive processes based on previous and embodied experiences interestingly complement experts’ knowledge of the architectural field and its semantics. The results directly inform how we, as researchers, designers and engineers, should take advantage of both novices’ and experts’ strategies to develop tools, methods or interfaces to support next generation cooperative design. [less ▲]

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See detailImpact of extracorporeal shock wave therapy in the treatment of chronic lateral epicondylitis
Deroanne, Adrien; Deroanne, Didier; Florkin, Marc et al

in Regional Anesthesia & Pain Medicine (2012, September), 37(5 - Suppl 1), 263

Background and aim: radial shock wave therapy (RSWT) is a relatively new way to treat chronic tendinopathies, such as lateral epicondylitis. However, very few studies have been realized on this subject ... [more ▼]

Background and aim: radial shock wave therapy (RSWT) is a relatively new way to treat chronic tendinopathies, such as lateral epicondylitis. However, very few studies have been realized on this subject, and the results are very divergent. We aimed to observe the impact of this technique on chronic lateral elbow pain. Method: fifteen subjects who had a lateral epicondylitis for at least 3 months were included in the study. Two groups were formed: experimental (10 subjects) who received 6 sessions of physiotherapy and RSWT, and the control group (5 subjects) who received exclusively physiotherapy. Physiotherapy sessions were composed of massage, stretching, diacutaneous fibrolysis, and a muscular eccentric program of the wrist extensor muscles. We evaluated the subjects before the first session, and after 6 weeks of treatment with a pain visual analog scale (VAS), the painless wrist flexion amplitude, ant the “Patient-Rated Tennis Elbow Evaluation” (PRTEE) questionnaire. Results: the difference between initial and final evaluations was significant (regarding to the wilcoxon test) for all of the parameters studied (p=0,028 for the VAS, p=0,005 for the wrist flexion amplitude, and p=0,005 for the PRTEE) in the experimental group. It wasn’t significant in the control group (VAS p=0,144128, wrist flexion amplitude p=0,079617, and PRTEE p=0,067890). The comparison between the two groups was not significant, neither in the beginning, nor in the end of the treatment (regarding to the Umann and Whitney test) Conclusions: RSWT associated to physiotherapy is a more effective treatment for lateral epicondylitis than physiotherapy alone. [less ▲]

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See detailImpact of extraction procedures on the chemical, rheological and textural properties of ulvan from Ulva lactuca of Tunisia coast
Yaich, Hela; Garna, Haikel; Besbes, Souhail et al

in Food Hydrocolloids (2014), (40), 53-63

The impact of the extraction conditions has been studied on the yield, chemical composition, rheological and textural properties of ulvan from the green seaweed Ulva lactuca. High ulvan yield was obtained ... [more ▼]

The impact of the extraction conditions has been studied on the yield, chemical composition, rheological and textural properties of ulvan from the green seaweed Ulva lactuca. High ulvan yield was obtained after combining enzymatic and chemical extraction but the lowest yield results at the drastic conditions (pH 1.5 and 90 C). Besides, solvent acidity was an important parameter controlling the ulvan extraction efficiency. The different extraction processes affected chemical composition of ulvan extracts and in particular, sulphate, ash and sugar contents. Low proportions of galactose, glucose and protein were also found in sulphated polysaccharides. The extract, which is resulted from combined enzymatic and chemical extraction, was mainly composed of high peak molecular weight polysaccharides. Ulvan hy-drocolloids demonstrated a pseudoplastic behavior. Viscoelastic behavior was carried out at a concen-tration of 1.6% (w/v) in the presence of 7 mM sodium tetraborate and at pH 7.5. However, polysaccharides formed a gel. It was not the case for the extract at pH 1.5 and 90 C under the same conditions. The results showed that a significant effect of the conditions of extraction on the textural characteristic (firmness, springiness and adhesiveness) of ulvan gels. [less ▲]

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See detailThe impact of financial disclosure on the information asymmetry and the liquidity of French listed companies
Ajina, Aymen ULg

Conference (2011, May)

This paper examines the relationship between the extent of financial disclosure, information asymmetry and stock-market liquidity in France. Based on a sample of 196 French listed firms over a period from ... [more ▼]

This paper examines the relationship between the extent of financial disclosure, information asymmetry and stock-market liquidity in France. Based on a sample of 196 French listed firms over a period from 2004 to 2007, we find that there is a positive and statistically significant relationship between the extent of information displayed through annual reports and market liquidity. This is explained by the negative effect of the disclosure on the adverse selection component of the bid-ask spread. This effect is confirmed by the commitment to IFRS by French-listed firms since 2005. This result should encourage French authorities to enhance their informational environment as a means to reduce information asymmetry and to prevent the risk of illiquidity. [less ▲]

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See detailImpact of flexibility practices and changes in work environments on worker well-being
Hansez, Isabelle ULg; De Keyser, Véronique ULg; D'Hoore, W. et al

in Sinangil, H.; Avallone, F.; Caetano, A. (Eds.) Convivence in organizations and society (2005)

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See detailImpact of flexibility practices and changes in work environments on worker well-being.
Hansez, Isabelle ULg; De Keyser, Véronique ULg; D'Hoore, W. et al

Conference (2005, May 15)

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See detailImpact of follicular G-CSF quantification on subsequent embryo transfer decisions: a proof of concept study.
Ledee, N.; Gridelet, Virginie ULg; RAVET, Stéphanie ULg et al

in Human Reproduction (2013), 28(2), 406-13

BACKGROUND: Previous experiments have shown that granulocyte colony-stimulating factor (G-CSF), quantified in the follicular fluid (FF) of individual oocytes, correlates with the potential for an ongoing ... [more ▼]

BACKGROUND: Previous experiments have shown that granulocyte colony-stimulating factor (G-CSF), quantified in the follicular fluid (FF) of individual oocytes, correlates with the potential for an ongoing pregnancy of the corresponding fertilized oocytes among selected transferred embryos. Here we present a proof of concept study aimed at evaluating the impact of including FF G-CSF quantification in the embryo transfer decisions. METHODS: FF G-CSF was quantified with the Luminex XMap technology in 523 individual FF samples corresponding to 116 fresh transferred embryos, 275 frozen embryos and 131 destroyed embryos from 78 patients undergoing ICSI. RESULTS: Follicular G-CSF was highly predictive of subsequent implantation. The receiving operator characteristics curve methodology showed its higher discriminatory power to predict ongoing pregnancy in multivariate logistic regression analysis for FF G-CSF compared with embryo morphology [0.77 (0.69-0.83), P < 0.001 versus 0.66 (0.58-0.73), P = 0.01)]. Embryos were classified by their FF G-CSF concentration: Class I over 30 pg/ml (a highest positive predictive value for implantation), Class II from 30 to 18.4 pg/ml and Class III <18.4 pg/ml (a highest negative predictive value). Embryos derived from Class I follicles had a significantly higher implantation rate (IR) than those from Class II and III follicles (36 versus 16.6 and 6%, P < 0.001). Embryos derived from Class I follicles with an optimal morphology reached an IR of 54%. Frozen-thawed embryos transfer derived from Class I follicles had an IR of 37% significantly higher than those from Class II and III follicles, respectively, of 8 and 5% (P < 0.001). Thirty-five per cent of the frozen embryos but also 10% of the destroyed embryos were derived from G-CSF Class I follicles. Non-optimal embryos appear to have been transferred in 28% (22/78) of the women, and their pregnancy rate was significantly lower than that of women who received at least one optimal embryo (18 versus 36%, P = 0.04). CONCLUSIONS: Monitoring FF G-CSF for the selection of embryos with a better potential for pregnancy might improve the effectiveness of IVF by reducing the time and cost required for obtaining a pregnancy. [less ▲]

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