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See detailCovalent bonding of functional coatings on conductive materials: the electrochemical approach
Cécius, Michaël; Jérôme, Christine ULg

in Urban, Marek W (Ed.) Handbook of Stimuli-Responsive Materials (2011)

This chapter contains sections titled: - Introduction - Electrodeposited Coatings - Electrografted Coatings - Compounds Requiring an Anodic Process - Compounds Requiring a Cathodic Process - Conclusions ... [more ▼]

This chapter contains sections titled: - Introduction - Electrodeposited Coatings - Electrografted Coatings - Compounds Requiring an Anodic Process - Compounds Requiring a Cathodic Process - Conclusions - References [less ▲]

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See detailCovalent liquids: tight binding simulation versus experimental results
Gaspard, Jean-Pierre ULg; Bichara, C.; Raty, Jean-Yves ULg et al

(1998)

We show that a simple tight binding model with a repulsive potential describes the Peierls distortions in covalent systems and the well-known octet rule. The existence and the intensity of the Peierls ... [more ▼]

We show that a simple tight binding model with a repulsive potential describes the Peierls distortions in covalent systems and the well-known octet rule. The existence and the intensity of the Peierls distortion is mainly related to the hardness of the repulsive potential as demonstrated both by theoretical calculations and by the experimental systematic analysis of liquid structures. In particular, As is threefold coordinated and Sb is sixfold coordinated in the liquid; the qualitative difference is explained by the ratio of the distortion energy DeltaE to the thermal energy k BT. The As xSb 1-x alloys show continuously varying average coordination numbers showing that the semiconductor-metal transition is continuous with concentration. In addition, we illustrate in the case of liquid Se that, tight binding Monte Carlo simulations are able to describe quantitatively the structure of liquid elements provided the Van der Waals potential is added [less ▲]

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See detailCovariance estimation with Method-R
Druet, Tom ULg; Misztal, I.; Duangjinda, M. et al

in Abstracts from the 2000 ADSA/ASAS joint annual meeting (2000)

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See detailCovariation between zooplankton community composition and cyanobacterial community dynamics in Lake Blaarmeersen (Belgium)
van Gremberghe, Ineke; Van Wichelen, Jeroen; Van der Gucht, Kathleen et al

in FEMS Microbiology Ecology (2008), 63

The cyanobacterial community composition in the mesotrophic Lake Blaarmeersen was determined by denaturing gradient gel electrophoresis (DGGE) of PCRamplified 16S rRNA gene fragments during two ... [more ▼]

The cyanobacterial community composition in the mesotrophic Lake Blaarmeersen was determined by denaturing gradient gel electrophoresis (DGGE) of PCRamplified 16S rRNA gene fragments during two consecutive years to assess the importance of different classes of explanatory variables (bottom-up and top-down factors, physical variables and phytoplankton) in cyanobacterial community dynamics. The most dominant cyanobacteria in Lake Blaarmeersen were Synechococcus (three genotypes), Limnothrix redekei and Anabaena/Aphanizomenon. Analyses of Similarity revealed that the cyanobacterial community in Lake Blaarmeersen differed significantly between the growing season and the winter season as well as between the epilimnion and hypolimnion during the stratified periods. Mantel tests revealed significant correlations between the DGGE data and bottom-up factors, physical variables, the phytoplankton community composition and, interestingly, the zooplankton community composition. In general, the zooplankton community composition (especially the cladoceran community) was more important in structuring the cyanobacterial community than the total zooplankton biomass. This study shows that grazing zooplankton communities can have a relatively strong impact on the cyanobacterial community dynamics and that this impact can be equally important as bottom-up processes regulated by nutrient concentrations and/or physical variables. [less ▲]

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See detailCovert waking brain activity reveals instantaneous sleep depth.
McKinney, Scott M; Dang Vu, Thien Thanh ULg; Buxton, Orfeu M et al

in PLoS ONE (2011), 6(3), 17351

The neural correlates of the wake-sleep continuum remain incompletely understood, limiting the development of adaptive drug delivery systems for promoting sleep maintenance. The most useful measure for ... [more ▼]

The neural correlates of the wake-sleep continuum remain incompletely understood, limiting the development of adaptive drug delivery systems for promoting sleep maintenance. The most useful measure for resolving early positions along this continuum is the alpha oscillation, an 8-13 Hz electroencephalographic rhythm prominent over posterior scalp locations. The brain activation signature of wakefulness, alpha expression discloses immediate levels of alertness and dissipates in concert with fading awareness as sleep begins. This brain activity pattern, however, is largely ignored once sleep begins. Here we show that the intensity of spectral power in the alpha band actually continues to disclose instantaneous responsiveness to noise--a measure of sleep depth--throughout a night of sleep. By systematically challenging sleep with realistic and varied acoustic disruption, we found that sleepers exhibited markedly greater sensitivity to sounds during moments of elevated alpha expression. This result demonstrates that alpha power is not a binary marker of the transition between sleep and wakefulness, but carries rich information about immediate sleep stability. Further, it shows that an empirical and ecologically relevant form of sleep depth is revealed in real-time by EEG spectral content in the alpha band, a measure that affords prediction on the order of minutes. This signal, which transcends the boundaries of classical sleep stages, could potentially be used for real-time feedback to novel, adaptive drug delivery systems for inducing sleep. [less ▲]

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See detailCoxsackievirus B4 and type 1 diabetes
Brilot, Fabienne; Geenen, Vincent ULg; Hober, Didier

in Thebault, Sabine (Ed.) Progress in Virus Research (2005)

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See detailCoxsackievirus B4 infection of human fetal thymus cells
Brilot, Fabienne; Geenen, Vincent ULg; Hober, Didier et al

in Journal of Virology (2004), 78(18), 9854-9861

The infection of human fetal thymus organ cultures (FTOC) with coxsackievirus B4 E2 (CVB4 E2) was investigated. Both positive- and negative-strand viral RNA were detected by real-time quantitative reverse ... [more ▼]

The infection of human fetal thymus organ cultures (FTOC) with coxsackievirus B4 E2 (CVB4 E2) was investigated. Both positive- and negative-strand viral RNA were detected by real-time quantitative reverse transcription-PCR (RT-PCR) in CVB4 E2-infected FTOC, which supported high yields of virus production (similar to10(6) 50% tissue culture infective doses/ml), and in flow-sorted thymocyte populations for 7 days after inoculation. Cortical CD4(+) CD8(+) thymocytes were found to be the principal targets of infection. Inoculation of human FTOC with CVB4 E2 led to a marked and progressive depletion of immature thymocytes (CD4(+) CD8(+) cells) with no enhancement of Annexin V-positive cells. CVB4 E2 replication caused significant major histocompatibility complex (MHC) class I upregulation on these cells. MHC class I upregulation was correlated with positive- and negative-strand RNA quantitative detection and the release of infectious particles. In addition, chloroquine treatment of FTOC and single-thymocyte suspensions suggested that MHC class I upregulation on thymocytes was the result of direct infection rather than caused by production of soluble factors such as alpha interferon. Thus, CVB4 E2 can infect human fetal thymocytes, which subsequently results in quantitative and qualitative abnormalities of these cells. [less ▲]

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See detailCoxsackievirus B4 Infection of Murine Foetal Thymus Organ Cultures
Brilot, F.; Jaidane, H.; Geenen, Vincent ULg et al

in Journal of Medical Virology (2008), 80(4), 659-66

The infection of foetal thymus with coxsackievirus B4 (CV-B4) E2 has been studied ex vivo by using CD-1 mice on foetal day 14, as a ready source of organs for experimentation to investigate the hypothesis ... [more ▼]

The infection of foetal thymus with coxsackievirus B4 (CV-B4) E2 has been studied ex vivo by using CD-1 mice on foetal day 14, as a ready source of organs for experimentation to investigate the hypothesis of the role of thymic viral infections in the pathogenesis of type 1 diabetes. The replication of CV-B4 E2 in murine foetal thymus organ cultures has been demonstrated by evaluating the levels of positive- and negative-stranded viral RNA in cells by using a real-time quantitative RT-PCR method and by determining titres of infectious viral particles in culture supernatants for 7 days post-infection (p.i.). Staining of tissue sections with an anti-cytokeratin antibody and haematoxylin-eosin showed that CV-B4 infection had no visible effect on cell survival and organ integrity. Cell counts in mock- and virus-infected foetal thymus organ cultures increased from day 1 through day 7, and live cell numbers were comparable in both conditions as shown by Trypan blue exclusion test and 7-amino-actinomycin D staining of thymocytes. Compared with controls on day 7 p.i., cytofluorometric analyses on cells from CV-B4 E2-infected foetal thymus organ cultures displayed a marked increase in the percentage of the most immature CD3(-)CD4(-)CD8(-) thymocytes, and a decrease in the percentage of immature CD3(-)CD4(+)CD8(+) cells, together with an increase in the percentage of mature CD3(+)CD4(+) and CD3(+)CD8(+) cells. These data show that CV-B4 E2 disturbs T-cell maturation and differentiation processes in infected murine foetal thymus organ cultures and provide evidence of a suitable system to investigate the effect of viruses in T-cell differentiation. J. Med. Virol. 80:659-666, 2008. (c) 2008 Wiley-Liss, Inc. [less ▲]

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See detailCo‐construction du langage: le rôle de la mère dans les séquences de rectifications
Collombel, Marie; Maillart, Christelle ULg; Caet, Stéphanie et al

Poster (2010, June 07)

Notre recherche a pour but de mieux repérer ce qui semble faciliter chez l'enfant tout venant son développement linguistique et communicationnel, afin de mettre en place des stratégies éducatives adaptées ... [more ▼]

Notre recherche a pour but de mieux repérer ce qui semble faciliter chez l'enfant tout venant son développement linguistique et communicationnel, afin de mettre en place des stratégies éducatives adaptées aux enfants présentant des troubles du langage. Dans une étude longitudinale des interactions mère-enfant chez trois enfants tout-venant entre 1 an 6 mois et 3 ans, notre équipe s'est penchée sur un phénomène interactionnel au croisement de l'appropriation du système linguistique et de son usage : les rectifications. Nos analyses soulignent le rôle clé de la mère ainsi que les similarités et les différences entre les dyades. La sensibilisation à ces dimensions de la communication auprès de parents d'enfants dysphasiques dans le cadre d'un projet de guidance parentale pourrait favoriser la mise en place de formes d'interaction facilitant le développement langagier et communicationnel des enfants. [less ▲]

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See detailCPB AND AORTIC SURGERY The state of the Art (From a Theoritical to a Practical Approach)
LAGNY, Marc-Gilbert ULg; BLAFFART, Francine ULg; Defraigne, Jean-Olivier ULg

Conference (2012, October 04)

Background Despite recent improvements in prevention, medical treatment [1]and endovascular aortic repair , invasive surgery associated with cardiopulmonary bypass (CPB) remains the best option of ... [more ▼]

Background Despite recent improvements in prevention, medical treatment [1]and endovascular aortic repair , invasive surgery associated with cardiopulmonary bypass (CPB) remains the best option of treatment for some patients. The aim of this study is to make a review of the specific CPB protocols associated with these invasive surgical approaches, based on our clinical experience and according to the recent literature. Up to now, these protocols are not supported by evidence based in medicine (EBM) [2] or in perfusion (EBP). Discrepancies can be observed regarding target temperature , selective cerebral protection , CPB circuit concept and arterial cannulation sites . Variables guidelines are suggested concerning regional flow , transfusion requirements [3], coagulation monitoring blood gas management[4] as for cerebral and CPB monitoring tools. Conclusions In the absence of EBM and EBP in the aortic surgery field, the short and long terms clinical outcomes of the patients elected to invasive surgery for aortic diseases must guide and substantiate our choices of techniques and of CPB protocols. [less ▲]

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See detailCPB AND AORTIC SURGERY: From a theoretical approach to a practical approach
LAGNY, Marc-Gilbert ULg; BLAFFART, Francine ULg

Conference given outside the academic context (2013)

Background Despite recent improvements in prevention, medical treatment [1]and endovascular aortic repair , invasive surgery associated with cardiopulmonary bypass (CPB) remains the best option of ... [more ▼]

Background Despite recent improvements in prevention, medical treatment [1]and endovascular aortic repair , invasive surgery associated with cardiopulmonary bypass (CPB) remains the best option of treatment for some patients. The aim of this study is to make a review of the specific CPB protocols associated with these invasive surgical approaches, based on our clinical experience and according to the recent literature. Up to now, these protocols are not supported by evidence based in medicine (EBM) [2] or in perfusion (EBP). Discrepancies can be observed regarding target temperature , selective cerebral protection , CPB circuit concept and arterial cannulation sites . Variables guidelines are suggested concerning regional flow , transfusion requirements [3], coagulation monitoring blood gas management[4] as for cerebral and CPB monitoring tools. Conclusions In the absence of EBM and EBP in the aortic surgery field, the short and long terms clinical outcomes of the patients elected to invasive surgery for aortic diseases must guide and substantiate our choices of techniques and of CPB protocols. [less ▲]

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See detailCPD - 59 deg 2857 - A new red variable star
Gosset, Eric ULg; Hutsemekers, Damien ULg; Surdej, Jean ULg

in Publications of the Astronomical Society of the Pacific [=PASP] (1985), 97

Two (C3 and C4) of the four comparison stars monitored during the photometric study of the peculiar emission-line star GG Car (Gosset et al., 1984) have been found to be variable. Available photometric ... [more ▼]

Two (C3 and C4) of the four comparison stars monitored during the photometric study of the peculiar emission-line star GG Car (Gosset et al., 1984) have been found to be variable. Available photometric and spectroscopic data allow us to identify C4 with CPD - 59 deg 2857 and classify it as a late-type giant (M3-4 III) belonging to the red variable stars of the semiregular or irregular type. [less ▲]

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See detailCPD-41° 7742: an unusual wind interaction
Sana, H.; Gosset, Eric ULg; Rauw, Grégor ULg et al

in Massive Stars and High-Energy Emission in OB Associations (2005, November 01)

We summarize the results of a multiwavelength observing campaign on the massive eclipsing binary CPD-41° 7742, another remarkable object in the young open cluster NGC 6231. Our campaign relies on high ... [more ▼]

We summarize the results of a multiwavelength observing campaign on the massive eclipsing binary CPD-41° 7742, another remarkable object in the young open cluster NGC 6231. Our campaign relies on high resolution echelle spectroscopy, narrow-band optical photometry, and XMM-Newton X-ray observations. Combined with the spectroscopic analysis, the light curve analysis provides a direct measurement of the masses and sizes of the system components. However, the most outstanding results come from the XMM observations. Our 180 ks campaign towards NGC 6231, and CPD-41° 7742, provides an unprecedented phase coverage of such a close early-type binary. The EPIC-MOS light curves almost fully cover the 2.4 day period of the system and the brightness of the object is sufficient to yield a time resolution as tight as 1 ks. The X-ray flux presents clear variations along the orbit, that we interpret as the signature of an unusual wind interaction. We indeed expect that, in this O+B system, the dominant primary wind crashes into the secondary surface, leading to a wind-photosphere interaction. As a strong support to our interpretation, we provide a geometrical model that associates an extra X-ray emission to the secondary inner surface. Though quite simple, the present model matches the main features of the X-ray light curve. [less ▲]

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See detailCpDNA-based species identification and phylogeography: application to African tropical tree species
Duminil, Jérôme; Heuertz, Myriam; Doucet, Jean-Louis ULg et al

in Molecular Ecology (2010), 19(24), 5469-5483

Despite the importance of the African tropical rainforests as a hotspot of biodiversity, their history and the processes that have structured their biodiversity are understood poorly. With respect to past ... [more ▼]

Despite the importance of the African tropical rainforests as a hotspot of biodiversity, their history and the processes that have structured their biodiversity are understood poorly. With respect to past demographic processes, new insights can be gained through characterizing the distribution of genetic diversity. However, few studies of this type have been conducted in Central Africa, where the identification of species in the field can be difficult. We examine here the distribution of chloroplast DNA (cpDNA) diversity in Lower Guinea in two tree species that are difficult to distinguish, Erythrophleum ivorense and Erythrophleum suaveolens (Fabaceae). By using a blind-sampling approach and comparing molecular and morphological markers, we first identified retrospectively all sampled individuals and determined the limits of the distribution of each species. We then performed a phylogeographic study using the same genetic data set. The two species displayed essentially parapatric distributions that were correlated well with the rainfall gradient, which indicated different ecological requirements. In addition, a phylogeographic structure was found for E. suaveolens and, for both species, substantially higher levels of diversity and allelic endemism were observed in the south (Gabon) than in the north (Cameroon) of the Lower Guinea region. This finding indicated different histories of population demographics for the two species, which might reflect different responses to Quaternary climate changes. We suggest that a recent period of forest perturbation, which might have been caused by humans, favoured the spread of these two species and that their poor recruitment at present results from natural succession in their forest formations. [less ▲]

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See detailThe CphAII protein from Aquifex aeolicus exhibits a metal-dependent phosphodiesterase activity
Kupper, Michaël; Bauvois, Cédric; Frère, Jean-Marie ULg et al

in Extremophiles : Life Under Extreme Conditions (2012), 16(1)

The CphAII protein from the hyperthermophile Aquifex aeolicus shows the five conserved motifs of the metallo-β-lactamase (MBL) superfamily and presents 28% identity with the Aeromonas hydrophila subclass ... [more ▼]

The CphAII protein from the hyperthermophile Aquifex aeolicus shows the five conserved motifs of the metallo-β-lactamase (MBL) superfamily and presents 28% identity with the Aeromonas hydrophila subclass B2 CphA MBL. The gene encoding CphAII was amplified by PCR from the A. aeolicus genomic DNA and overexpressed in Escherichia coli using a pLex-based expression system. The recombinant CphAII protein was purified by a combination of heating (to denature E. coli proteins) and two steps of immobilized metal affinity chromatography. The purified enzyme preparation did not exhibit a β-lactamase activity but showed a metal-dependent phosphodiesterase activity versus bis-p-nitrophenyl phosphate and thymidine 5'-monophosphate p-nitrophenyl ester, with an optimum at 85°C. The circular dichroism spectrum was in agreement with the percentage of secondary structures characteristic of the MBL αββα fold. [less ▲]

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See detailCPLU - rapport d'activité 2010
Willems, Sylvie ULg

Report (2011)

Rapport d'activité de la Clinique Psychologique et Logopédique de l'Université de Liège - Année 2010

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See detailCPLU - rapport d'activité 2011
Willems, Sylvie ULg

Report (2011)

Rapport d'activité de la Clinique Psychologique et Logopédique de l'Université de Liège - 2012

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