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See detailInternational Symposium: Eroticism, Poetic Concretism, and Visuality (1960-1970)
Minuto, Maria Elena ULiege

Poster (2021, September 17)

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See detailPaleobiology of an Ediacaran acanthomorphic acritarch
Domino, Samuel ULiege; Loron, Corentin ULiege; Sforna, Marie-Catherine ULiege et al

Poster (2021, July)

The Ediacaran is a crucial time of changes in climatic and redox conditions, nutrient availability, and diversification of eukaryotes, including planktonic algae and the first unambiguous metazoans ... [more ▼]

The Ediacaran is a crucial time of changes in climatic and redox conditions, nutrient availability, and diversification of eukaryotes, including planktonic algae and the first unambiguous metazoans. During this period, new and highly diverse organic-walled eukaryotic microfossils appear worldwide, but their identity remains enigmatic. They are called the “Doushantuo-Pertatataka type Acanthomorphic acritarchs” (DPA). Their morphological complexity (diverse types of processes expanding from the vesicle wall) evidences their eukaryoticity. Several hypotheses for their affinity have been proposed, tentatively interpreting a few of these microfossils as eggs of metazoans [1,2] or cysts of chloroplastid green algae [2-5], but they remain ambiguous. To test these hypotheses, we present a morphological, ultrastructural and spectroscopic characterisation of one of the most emblematic DPA acritarchs, Gyalosphaeridium pulchrum. Such analytical combination has never been performed all together on a DPA taxon. The fossils come from the Munta-1 drillcore from the Tanana formation in the eastern Officer basin in Australia. Quantitative analyses [6] of microfossils through the drillcore revealed assemblages dominated by simple smooth-walled sphaeromorphs, and less abundant but very diverse and exquisitely preserved acanthomorphs, previously reported [7]. Drawing on our analyses and previous work, we discuss the possible diagnostic combinations of characters to pinpoint the clade to which the microfossils may belong. This approach, extended to more DPA taxa, will permit to constrain the appearance of eukaryotic clades in the Ediacaran and their role in the complexification of late Precambrian ecosystems. It will also provide guidelines for future identification of similarly enigmatic microfossils, frequent in Precambrian and Paleozoic strata. [1] Cohen, Knoll & Kodner (2009), Proceedings of the National Academy of Sciences 106, 6519–6524. [2] Willman (2009), Geobiology 7, 8–20. [3] Marshall, Javaux, Knoll & Walter (2005), Precambrian Research 138, 208–224. [4] Moczydłowska & Liu (2021), Geological Magazine, doi:10.1017/S0016756820001405. [5] Willman & Moczydłowska (2007), Lethaia 40, 111–123. [6] Calers (2020), Diversification de la biosphère après un impact de météorite (Acraman, Australie) au Néoprotérozoïque, M. Sc. thesis, Université de Liège. [7] Grey (2005), Memoirs of the Association of Australasian Palaeontologists 31, 439 pp. [less ▲]

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See detailDIAGNOSIS OF HEMATOPOIETIC MALIGNANCIES WITH GERMLINE PREDISPOSITION : A FILTERED WHOLE EXOME SEQUENCING APPROACH
FERNANDEZ CARAZO, Rafael ULiege; Koopmansch, Benjamin; Charloteaux, Benoit et al

Poster (2021, June 17)

Background: In the frame of the development of new analytical methods for the diagnostic of patients suffering of suspected inherited malignancies with poor access to rapid diagnosis due to a restricted ... [more ▼]

Background: In the frame of the development of new analytical methods for the diagnostic of patients suffering of suspected inherited malignancies with poor access to rapid diagnosis due to a restricted number of analytical sites or the current use of non-comprehensive targeted panels, we aimed at developing a new NGS panel for the analysis of several haematological diseases based on a filtered whole exome sequencing approach. Aims: Haematological diseases incorporated in the panel include myelodysplasic syndromes, acute myeloid leukemia, inherited bone marrow failure syndromes, Fanconi anemia, Diamond Blackfan anemia, dyskeratosis congenita, Telomeropathies and severe congenital neutropenia. Methods: Clinical exome is sequenced with the SureSelect Hulan Exome V6, recovering information for about 20k genes, representing ca. 180k exons. A newly designed variant filter based on an in-house pipeline tree (Alissa Interpret) for the flagging of retained variants, allows for the selection and labeling of ca. 100 variants per patient. Variants are categorized following the ACMG guidelines for the interpretation of inherited variants and reported in the context of the patient malignancies. The set of genes has been selected from a deep insight to the most recent literature and guidelines and covers 85 full (exonic) genes. The ncRNA gene TERC and intronic regions from RETL1 are also included in the set. The analytical pipeline considers the analysis of single patients, corroboration of relevant inherited germline mutations from fibroblasts and/or trio analysis including first or second relatives. Applications cover from simple diagnostic from single patients to familiar studies or donor compatibility analysis. Results: Inherited Haematological Malignancies are a heterogeneous group of malignancies not yet fully understood and in constant evolution. In this context, flexibility is a key concept to avoid analytical obsolescence. Due to the wide range of genes covered by the WES approach, significant genes could be further updated, with a minimal effort, to the panel. Summary/Conclusion: We therefore aim to provide physicians with a comprehensive diagnostic panel for the diagnostic work-up of patients affected (or suspected to be affected) by inherited haematological malignancies, and related diseases enhancing the patient’s chances to benefit from a personalized medicine approach; together with a view to increase the knowledge about those (rare) conditions [less ▲]

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See detailNumerical simulation of transparent heterojunctions based on Cu2O thin films.
Sliti, Naama ULiege; Ratz, Thomas ULiege; Touihri, Saad et al

Poster (2021, June 02)

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See detailTheoretical study of the opto-electronic properties of Cu2ZnXS4 (X=Sn,Ge,Si) kesterites for solar cell efficiency modelling.
Ratz, Thomas ULiege; Raty, Jean-Yves ULiege; Brammertz, Guy et al

Poster (2021, June 02)

In this work, first-principles calculations of Cu2ZnSnS4, Cu2ZnGeS4 and Cu2ZnSiS4 are per- formed to highlight the impact of the cationic substitution on the structural, electronic and optical properties ... [more ▼]

In this work, first-principles calculations of Cu2ZnSnS4, Cu2ZnGeS4 and Cu2ZnSiS4 are per- formed to highlight the impact of the cationic substitution on the structural, electronic and optical properties of kesterite compounds. Direct bandgaps are reported with values of 1.32, 1.89 and 3.06 eV respectively for Cu2ZnSnS4, Cu2ZnGeS4 and Cu2ZnSiS4 and absorption coefficients of the order of 10^4 cm−1 are obtained, indicating the applicability of these materials as absorber layer for solar cell applications. In the second part of this study, ab initio results are used as input data to model the electrical power conversion efficiency of kesterite-based solar cells. In that perspective, we used an improved version of the Shockley-Queisser model including non-radiative recombination via an external parameter defined as the internal quantum efficiency. Based on predicted optimal absorber layer thicknesses, the variation of the solar cell maximal efficiency is studied as a function of the non-radiative recombination rate. Maximal efficiencies of 25.71, 19.85 and 3.10 % are reported respectively for Cu2ZnSnS4, Cu2ZnGeS4 and Cu2ZnSiS4 for vanishing non-radiative recombination rate. Using an internal quantum efficiency value providing experimentally comparable VOC values, cell efficiencies of 15.88, 14.98 and 2.66 % are reported respectively for Cu2ZnSnS4, Cu2ZnGeS4 and Cu2ZnSiS4. We confirm the suitability of Cu2ZnSnS4 in single junction solar cells, with a possible efficiency improvement of nearly 10% enabled through the reduction of the non-radiative recombination rate. In addition, Cu2ZnGeS4 appears to be an interesting candidate as top cell absorber layer for tandem approaches whereas Cu2ZnSiS4 might be interesting for transparent photovoltaic windows. [less ▲]

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See detailProbing interfaces in perovskite solar cells by intensity modulated photocurrent spectroscopy
Kumar, Sunil; Balty, François ULiege; Sliti, Naama ULiege et al

Poster (2021, June 02)

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See detailContentless Thinking is Associated with Whole-Brain Positive Inter-Areal Connectivity Patterns
Mortaheb, Sepehr ULiege; Van Calster, Laurens ULiege; Boulakis, Paradeisios Alexandros et al

Poster (2021, June)

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See detailMössbauer spectroscopy studies of Fe-based electrode material for Li-ion and Na-ion batteries
Mahmoud, Abdelfattah ULiege; Bodart, Jérôme ULiege; Karegeya, Claude ULiege et al

Poster (2021, May 05)

Batteries have become essential in tackling global warming and energy security. In 2019, the developers behind the Lithium-ion batteries (LIBs) were awarded the Nobel Prize for chemistry. LIB by having ... [more ▼]

Batteries have become essential in tackling global warming and energy security. In 2019, the developers behind the Lithium-ion batteries (LIBs) were awarded the Nobel Prize for chemistry. LIB by having the highest energy density of any such device is considered as the battery of choice for electric vehicles and large-scale smart grids [1, 2]. However, LIBs cannot stand alone to fulfill future needs; therefore, it is urgent to develop new energy storage devices with high safety, lower cost, and high energy density to realize mobiles and large-scale applications. Na-ion batteries (NIBs) are considered to be an alternative to Li-ion batteries owing to the natural abundance of sodium. Indeed, NIBs are expected to become part of the mix of technologies that will meet the challenges of energy storage. Electrode materials are the most important components in the operation and the performance of LIBs and NiBs. New electrode materials are required to increase the energy density of Li/Na-ion batteries. Iron-based materials with non-toxic metals are good candidates to search for new high-performance electrodes [3, 4, 5]. Indeed, Fe-phosphate-based electrode materials for LIBs and NIBs have been intensively investigated to evaluate the electrochemical performance. Mössbauer spectroscopy has been used as a powerful tool to investigate the local electronic and structural properties and to elucidate the reaction mechanisms during the electrochemical cycling of the electrode materials for LIBs and NIBs. Indeed, Mössbauer spectroscopy technique could provide a lot of information about the local environment of atoms through electric and magnetic interactions. In this poster, we will show from some selected examples how Mössbauer spectroscopy when used with X-ray diffraction can help to improve the performance of electrode materials for Li/Na-ion batteries. References: 1- J. Światowska, P. Barboux, Elsevier, (2015), pp. 125-166. 2- A. Mahmoud, I. Saadoune, P.-E. Lippens, M. Chamas, R. Hakkou, J.M. Amarilla, Solid State Ionics, 300 (2017), pp. 175-181 3- T. Jungers, A. Mahmoud, C. Malherbe, F. Boschini, B. Vertruyen, Journal Materials Chemistry, A, 7 (2019), pp. 8226-8233. 4- R. Essehli, A. Alkhateeb, A. Mahmoud, F. Boschini, H. Ben Yahia, R. Amin, I. Belharouak, Journal of Power Sources, 469 (2020), pp. 228417. 5- C. Karegeya, A. Mahmoud, F. Hatert, R. Cloots, B. Vertruyen, P. E. Lippens, F. Boschini, Solid State Ionics, 326 (2018), pp. 18-26. Acknowledgment: The authors would like to kindly thank Walloon Region for the financial support. [less ▲]

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See detailPersistent organic pollutants in feathers of the Greater rhea (Rhea americana), a near-threatened flightless bird of the Pampas grasslands
Lèche, Alvina; Gismondi, Eric ULiege; Martella, Monica B. et al

Poster (2021, May)

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See detailMercury toxicity on biomarker gene expressions of a freshwater amphipod at two temperatures
Melo, Madson; Gismondi, Eric ULiege

Poster (2021, May)

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See detailImproving the representation of cropland sites in the Community Land Model (CLM) version 5.0
Boas, Theresa; Bogena, Heye; Grünwald, Thomas et al

Poster (2021, April 28)

The incorporation of a comprehensive crop module in land surface models offers the possibility to study the effect of agricultural land use and land management changes on the terrestrial water, energy and ... [more ▼]

The incorporation of a comprehensive crop module in land surface models offers the possibility to study the effect of agricultural land use and land management changes on the terrestrial water, energy and biogeochemical cycles. It may help to improve the simulation of biogeophysical and biogeochemical processes on regional and global scales in the framework of climate and land use change. In this study, the performance of the crop module of the Community Land Model version 5 (CLM5) was evaluated at point scale with site specific field data focussing on the simulation of seasonal and inter-annual variations in crop growth, planting and harvesting cycles, and crop yields as well as water, energy and carbon fluxes. In order to better represent agricultural sites, the model was modified by (1) implementing the winter wheat subroutines after Lu et al. (2017) in CLM5; (2) implementing plant specific parameters for sugar beet, potatoes and winter wheat, thereby adding the two crop functional types (CFT) for sugar beet and potatoes to the list of actively managed crops in CLM5; (3) introducing a cover cropping subroutine that allows multiple crop types on the same column within one year. The latter modification allows the simulation of cropping during winter months before usual cash crop planting begins in spring, which is an agricultural management technique with a long history that is regaining popularity to reduce erosion and improve soil health and carbon storage and is commonly used in the regions evaluated in this study. We compared simulation results with field data and found that both the new crop specific parameterization, as well as the winter wheat subroutines, led to a significant simulation improvement in terms of energy fluxes (RMSE reduction for latent and sensible heat by up to 57 % and 59 %, respectively), leaf area index (LAI), net ecosystem exchange and crop yield (up to 87 % improvement in winter wheat yield prediction) compared with default model results. The cover cropping subroutine yielded a substantial improvement in representation of field conditions after harvest of the main cash crop (winter season) in terms of LAI magnitudes and seasonal cycle of LAI, and latent heat flux (reduction of winter time RMSE for latent heat flux by 42 %). Our modifications significantly improved model simulations and should therefore be applied in future studies with CLM5 to improve regional yield predictions and to better understand large-scale impacts of agricultural management on carbon, water and energy fluxes. [less ▲]

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See detailSupercritical CO2 foaming of PCL covalent networks—taking benefit from the thermoreversible Diels–Alder cycloaddition
Houbben, Maxime ULiege; Jérôme, Christine ULiege

Poster (2021, April 19)

Foams are versatile materials encountered in our daily life for a wide variety of uses such as cushioning, thermal and acoustic insulation or medical applications. The combination of the mixed properties ... [more ▼]

Foams are versatile materials encountered in our daily life for a wide variety of uses such as cushioning, thermal and acoustic insulation or medical applications. The combination of the mixed properties between a continuous matrix and gas cells and the diversity of pore structures represent a powerful tool for the design of new materials. Among the different polymer foam fabrication processes, the use of supercritical CO2 has been one of the most investigated in the past decade. Nevertheless, the design of crosslinked polymer foams with high foaming ratio still remains a challenge. Various crosslinking processes mainly based on heating, irradiation with the addition of an external agent have been applied after foaming but remain difficult to perform due to mass transfer issues of the crosslinking agent. When crosslinking occurs before foaming, it dramatically limits the material expansion. In order to overcome these drawbacks, the present work aims taking advantage of the thermoreversible Diels-Alder cycloaddition to elaborate foams of poly(ε-caprolactone) (PCL) covalent networks. Based on this reaction, we considered to induce cross-linking after the foam expansion by playing on the thermal equilibrium of the thermoreversible Diels-Alder cycloaddition. Therefore, low molar mass star-shape PCL end-capped by furan or maleimide were impregnated with CO2 under supercritical conditions and then foamed under appropriate control of the pressure and temperature. The resulting foam possesses a much higher volume expansion than a pre-crosslinked sample foamed in the same conditions, thanks to the low crosslinking ratio during foaming. These foams exhibit also improved thermal stability thanks to its chemical crosslinking as compared to non-crosslinked PCL foams. Interestingly, these foams possess shape memory properties due to the semi-crystallinity of the PCL. Thermal stability and shape memory properties were evaluated by dynamic mechanical analysis in both tensile and compression testing with controlled force mode, stress and temperature ramps. Since significant maleimide/furan adduct cycloreversion can be achieved at high temperature, system reversibility and recyclability have also been attested. This foaming process proves itself very interesting by the formation of highly physically expanded and recyclable crosslinked foams from a non-initially foamable material. This contribution aims at reporting a new concept that can be used for the preparation of highly expanded and crosslinked polymers foams from any semi-crystalline polymers. [less ▲]

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See detailRecyclable porous Ionic liquid catalysts from one-pot emulsion templating multicomponent polymerization
Stiernet, Pierre ULiege; Aqil, Abdelhafid ULiege; Debuigne, Antoine ULiege

Poster (2021, April 19)

Porous poly(ionic liquid)s (PILs) combine the intrinsic features of ionic liquids (ILs) with properties of polymers and porous structures notably enlarged surface area, high ionic density, spatial ... [more ▼]

Porous poly(ionic liquid)s (PILs) combine the intrinsic features of ionic liquids (ILs) with properties of polymers and porous structures notably enlarged surface area, high ionic density, spatial structuration, and the tunability of their properties via counterions exchange. Over the years, they have become essential materials for many applications, i.e., gas separation, CO2 capture, energy storage, polymer electrolyte in Li-batteries, sensors and catalysis. Amongst them, porous poly(imidazolium)s (PIMs) are of great interest for cutting edge applications, especially for heterogenous catalysis. Their chemical composition catalyzes a wide range of reactions while their macrostructure allows easy recyclability without the need of advanced purification methods. However, structuring PIMs into porous materials is not trivial and requires multistep approaches based on the polymerization of preformed imidazolium monomers or by post-modification of porous organic networks. Therefore, the search for simpler and straightforward synthesis of porous PILs is highly relevant. In this respect, the emergence of multicomponent reactions (MCR), in which three or more compounds react and form a product containing essentially all atoms of the starting reagents, offers new opportunities. This communication aims at reporting a straightforward and atom economical approach for designing interconnected macroporous imidazolium-based networks. The latter combines for the first time the aqueous mediated Radziszewski MCR under high internal phase emulsion (HIPE) conditions. The catalytic activity and recyclability of these materials are illustrated for transesterification and decarboxylation reactions [less ▲]

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See detailCharacterization of the apx2 mutant in Chlamydomonas
Caccamo, Anna ULiege; Vega de Luna, Felix ULiege; Iacono, Fabrizio ULiege et al

Poster (2021, April 08)

One of the most common reactive oxygen species (ROS) produced in eukaryotic organisms during photosynthesis is hydrogen peroxide (H2O2) [1]. To evaluate the impact of H2O2-scavenging enzymes on algal ... [more ▼]

One of the most common reactive oxygen species (ROS) produced in eukaryotic organisms during photosynthesis is hydrogen peroxide (H2O2) [1]. To evaluate the impact of H2O2-scavenging enzymes on algal fitness, we selected a mutant deficient in ascorbate peroxidase 2 (APX2) in the green microalga Chlamydomonas reinhardtii. Ascorbate peroxidase (APX) uses ascorbate and H2O2 as substrates to form monodehydroascorbate (MDHA) and H2O. The enzyme, encoded by eight isoforms in Arabidopsis thaliana, has been already well-described in plants as one of the main actors involved in the Mehler reaction in which electrons obtained from H2O oxidation in photosystem II (PSII) are linearly transported to the acceptor side of photosystem I (PSI) where they are used to completely reduce the superoxide (O2-) to H2O [2]. In Chlamydomonas, four APX isoforms are present and APX2 is predicted to be targeted to the thylakoid membrane of the chloroplast using Target P [3]. In this study, we focus on the importance of APX2 in the Mehler reaction and during linear electron flow. To assess these two functionalities of APX2, we evaluated photosynthetic parameters under control light and high light in cells grown phototrophically. Therefore, we compared the quantum yield of PSII (φPSII) by monitoring in vivo chlorophyll a fluorescence, and the photooxidation and the re-reduction rate of the PSI of wild type (WT) and apx2 mutant cells. We found that the effects of the loss of APX2 are mainly seen in cells grown in control light. The apx2 mutant cells present a decreased rate of the relative electron transport (rETR) in phototrophic control light growth condition and the PSII efficiency resembles the one of WT under high light or H2O2 stress. We also observed a higher PSI photooxidation rate for the apx2 mutant compared to WT in cells grown in control light, suggesting an electron donor side limitation at the level of the PSI. Further, the lower re-reduction rate of the PSI in apx2 mutant compared to the WT after a short pulse of saturating light supports our observations. All in all, the APX2 enzyme seems to exert its function under unstressful physiological condition and could be involved in the early redox poise of photosynthesis. Funded by FNRS-FWO EOS Project 30829584 [1] Asada, Plant Physiol. 141, 391 – 396 (2006) [2] Dietz et al., J. Exp. Bot. 53, 1321 – 1329 (2002) [3] Emanuelsson et al., J. Mol. Biol. 300, 4, 1005 – 106 (2000) [less ▲]

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See detailChallenges in treating physician burnout: The psychologist's perspective
Lenoir, Anne-Laure ULiege; De Troyer, Caroline; Demoulin, Carole et al

Poster (2021, April)

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See detailRaising awareness among plant virologists on the richness of their high-throughput sequencing data
Haegeman, Annelies; Foucart, Yoika; Goedefroit, Thomas et al

Poster (2021, April)

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See detailEffects of lead width variation, re-freezing and mixing events on lead water structure in the central Arctic
Nomura, Daiki; Web, A.; Li, Y. et al

Poster (2021, April)

We undertook a lead survey during the international drift campaign MOSAiC, Leg 5 (from 22 August to 17 September 2020) to understand the effects of lead width variation, re-freezing, and mixing events on ... [more ▼]

We undertook a lead survey during the international drift campaign MOSAiC, Leg 5 (from 22 August to 17 September 2020) to understand the effects of lead width variation, re-freezing, and mixing events on lead water vertical structure. At the beginning of the survey period, the freshwater layer was occupied for the top 1 m depth and there were strong vertical gradients in temperature, salinity, and dissolved oxygen (DO) within 1 m depth: from 0.0°C to –1.6°C for temperature, from 0.0 to 31.4 psu for salinity, and 10.5 to 13.5 mg L–1 for DO. A strong DO minimum layer corresponded with a salinity of 25 psu, and usually occurred at the freshwater–seawater interface at approx. 1 m depth, most likely as a result of an accumulation of organic matter and ongoing degradation/respiration processes at this interface. However, during the survey period, these strong gradients weakened and reduced the freshwater layer thickness (FLT). In the first half of the sampling period (until 4 September), FLT changed due to variations in lead width: as lead width increased, FLT decreased due to a stretching of the freshwater layer. In the second half of the sampling period, FLT was controlled by the surface ice formation (re-freezing) and mixing processes along the lower boundary of the freshwater layer. Surface ice formation removed freshwater and the formation of surface ice (about 0.2 m thick) explains 20% of the reduction of FLT. The remaining 80% of the reduction of FLT was due to the mixing process within the water column that was initiated by cooling and re-freezing. This mixing process diluted the salinity from 31.6 to 29.3 psu in the water below freshwater layer towards the end of the survey period. Our results indicate that lead water structure can change rapidly and dynamically and that this has significant effects on the biogeochemical exchange between lead systems and the atmosphere. [less ▲]

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See detailLC-GC×GC-ToFMS/FID: a powerful technique for MOSH and MOAH quantification and characterization
Bauwens, Grégory ULiege; Purcaro, Giorgia ULiege

Poster (2021, March 12)

Mineral oil hydrocarbons (MOHs) are generally classified into MO saturated (MOSH) and aromatic hydrocarbons (MOAH) with different toxicological relevance and analytical challenges. Beside sample ... [more ▼]

Mineral oil hydrocarbons (MOHs) are generally classified into MO saturated (MOSH) and aromatic hydrocarbons (MOAH) with different toxicological relevance and analytical challenges. Beside sample preparation, data interpretation and integration represent an important source of uncertainty, evaluated on the order of 20%. The use of GC×GC has been proposed to support the data interpretation but the integration and the reliability of the results using this methodology have never been systematically evaluated. The aim of this work was to investigate the advantages of a novel fully integrated LC-GC×GC-ToFMS/FID platform for the analysis of MOSH and MOAH. Moreover, from a systematic study of the precedent failures of the 2D quantification approach a novel solution was proposed for simplifying and automating the entire process. [less ▲]

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See detailComparison of headspace solid-phase microextraction high capacity fiber coatings for untargeted analysis of beer volatiles using GC-MS/VUV
Zanella, Delphine ULiege; Anderson, Hailee E.; Selby, Talena et al

Poster (2021, March 12)

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See detailUse of Vandenberg and Kuse mental rotation test to predict practical performance of rhinosinus endoscopy
Pottier, Laurence ULiege; El Haddadi, Ilyas; Defaweux, Valérie ULiege et al

Poster (2021, March 06)

Introduction and Aim: The aim of this work is to assess the predictive value of the Vandenberg and Kuse Mental Rotation Test (MRT) on performance of novice medical student for manipulation of a nasal ... [more ▼]

Introduction and Aim: The aim of this work is to assess the predictive value of the Vandenberg and Kuse Mental Rotation Test (MRT) on performance of novice medical student for manipulation of a nasal endoscope on a cadaveric model. Material and Methods: We randomly selected 39 medical students who had never handled a nasal endoscope and subjected them to the MRT. They were then asked to perform series of cadaveric model exercises using a nasal endoscope. Two judges, using the Lindquist’s scale, evaluated their performance on cadavers. They were also asked to fill in a questionnaire aimed at defining their general profile (personal experience with manual activities and medical manual activities, surgical tropism, etc.) and an anatomic test in order to exclude possible confounding factors. Results: We found that medical students with higher mental rotation skills had significantly increased endoscopic sinus performance (p=0.0251 using univariate regression, and p=0.0002 using multivariate regression adjusted for specialty choice, previous surgical exposure and anatomy knowledge). Higher anatomy knowledge was also associated with better endoscopic sinus performance (p=0.0141). Other parameters had no impact on endoscopic sinus performance measured by the endoscopic scale (p>0.005). Conclusion: The score obtained on the MRT is correlated to the practical performance of manipulating the nasal endoscope in surgery. It could therefore be a useful spatial ability tool for educational purposes for candidates specializing in rhinology. [less ▲]

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See detailInfluence of storage temperature for respiratory epithelial samples on ciliary functional analysis
Benchimol, Lionel ULiege; Bricmont, Noémie ULiege; BOBOLI, Hedwige ULiege et al

Poster (2021, March 06)

Introduction and Aim: Primary ciliary dyskinesia is characterized by inherited stationary or dyskinetic respiratory cilia. Digital high speed videomicroscopy is highly sensitive and specific for diagnosis ... [more ▼]

Introduction and Aim: Primary ciliary dyskinesia is characterized by inherited stationary or dyskinetic respiratory cilia. Digital high speed videomicroscopy is highly sensitive and specific for diagnosis but lacks standardization. Particularly, the temperature for samples conservation has never been studied. The study goal was to compare ciliary analysis after samples storage at 4°C or 22°C. Agreement between two independent observers was sought as secondary goal. Material and Methods: Ciliated epithelial samples were obtained by inferior turbinate brushing from 13 healthy subjects, divided equally and conserved at 4°C or at 22°C. Digital high speed videomicroscopy assessed ciliary beat frequency (CBF) and percentage of normal ciliary beat pattern (CBP) nine hours after sampling. Results: There was no significant difference when samples were stored at 4°C or 22°C. Median CBF was 13.37 (12,23 –15,37) Hz and 15.24 (12,89 –16,06) Hz at 4°C and 22°C respectively (p = 0.210). Percentage of normal CBP was 81,80% (63,75 – 90,65) and 80,00% (71,70 – 87,30) at 4°C and 22°C respectively (p = 0.910). Moreover, inter observer analysis showed high agreement rate with 93,4% for the CBF and 90.0% for the CBP. Conclusion: This pilot study suggested with a high inter observer agreement rate that the temperature for respiratory ciliated samples conservation had no effect on ciliary function analysis. Larger studies are needed to confirm these preliminary results, notably in pathological conditions. [less ▲]

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See detailDiving impact: Frequentation, diver behavior and consequences on the mediterranenan fish community
Iborra, Laura ULiege; Leduc, Michèle; Cuny, Philippe et al

Poster (2021, March)

Popularization of recreational scuba diving has increased in recent years, adding a new dimension to the human impacts on aquatic systems. Although impacts at the individual level have been identified ... [more ▼]

Popularization of recreational scuba diving has increased in recent years, adding a new dimension to the human impacts on aquatic systems. Although impacts at the individual level have been identified, what causes these behaviors and how the Mediterranean fish community responds is not clear. In this research, we studied during high season: (i) the frequentation of a diving site in the bay of Calvi (Corsica, France), using the dive sheets of local diving structures but also taking aerial photographs (ii), the behavior of the divers by observing their diving practice in 10-minute-increments in order to determine how many contacts they had with the environment, what type of contact there was (voluntary or involuntary) and which part of the body or instrument was involved, and finally (iii) the composition of the fish assemblage (i.e. abundance, size structure and species composition) through Underwater Visual Census (UVC) counts carried out before and after the divers’ arrival on site. In addition, a particular attention was paid to patrimonial species, namely the brown grouper (Epinephelus marginatus), by noting the size and reaction of the individuals when confronted to divers, according to 5 behavioral typologies: "Close flight <10 m","Distant flight >10 m","Attraction","Indifference" and "Change of position, observation of the diver". Our results show that the monitored diving site is particularly popular with an average of 82 divers per day during high season. Divers’ awareness of the impacts of diving is relatively low and more than 80 % of them made contact with the environment during the diving session, with an average of 7 contacts per 10 min. The majority of involuntary contacts involve fins, while the rest of contacts are very diverse, involving both the body and the equipment (octopus, diving bottle, pressure gauge, safety sausage, etc.). Additionally, divers holding a camera are more likely to make intentional contact with the substrate. Divers’ experience is also a major factor; their ability to control their buoyancy has an impact on the various types of contacts observed. The divers with good buoyancy control are more prone to make voluntary contact, while divers with poor buoyancy control tend to make more involuntary contact. Fish populations respond differently depending on the species involved. Indeed, Brown meagre (Sciaena umbra) and Dusky groupers (Epinephelus marginatus) seem to be the most disturbed by the divers’ presence. Their biomasses decrease significantly following diving sessions, which indicates an attempt to escape or a desire to hide. We also found that the bigger the groupers, the further away they would flee. On the contrary, small individuals are curious and more likely to show an attraction to diver. Furthermore, there is no significant difference between the "distant flight" and "change of position" behaviors, which shows that large groupers (> 70 cm) are more wary of divers, by observing them, preparing for an escape or even fleeing more than 10 m away. On the contrary, the “Indifference” and “Close flight” behaviors do not show a significant difference, meaning that smaller groupers (50 - 70cm) are less fearful. Lastly, the number of divers per site, their environmental sensitivity and knowledge, their level of technicality, as well as their type of practice determine their impact on the marine environment. Our research stresses out the importance of delivering messages about the environment and the right conduct to adopt underwater during the pre-diving briefing: divers who received information before diving will potentially make less contact with the marine environment. [less ▲]

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See detailFour steps for rapid differential diagnosis of dentomaxillary pathologies
MILICEVIC, Mladen ULiege

Poster (2021, March)

Purpose or Learning Objective To propose different diagnostical steps regarding the majority and the most frequent dentomaxillary lesions. The first step is lesional description, the second precise ... [more ▼]

Purpose or Learning Objective To propose different diagnostical steps regarding the majority and the most frequent dentomaxillary lesions. The first step is lesional description, the second precise lesional topography, the third discuss a sex predominance and age of diagnosis, and the fourth is a discussion about specificity of semiological signs. Methods or Background For many years the gold standard in dentomaxillary imaging were the intraoral and panoramic radiographies, in some cases the CT. The Cone Beam Computed Tomography (CBCT) put maxillofacial imaging on higher level than before. The small field of intraoral radiography and two-dimensional panoramic radiography don’t allow a correct check-up of many neoplastic, systemic, inflammatory and sometimes of large infectious pathologies. The CBCT with its possibilities of three-dimensional and multiplanar reconstructions, with its higher resolution than a CT, allows more accurate differential diagnosis of dentomaxillary pathologies. In certains conditions such as the malignant pathologies we can need a MRI and histological analysis. In some countries there are radiologists making dentomaxillary imaging and in others dentists. Because of various pathologies specifically linked to maxillary bones use of dentomaxillary CBCT is found to be more complex than a panoramic or an oral radiography for dentists and not at all easier for radiologists. In both cases it is the question of specific training for these pathologies suspected by CBCT. Results or Findings Diagnosis is always oriented by the clinic aided by CBCT, more rarely by CT or MRI and finally often completed by histological analysis especially in tumoral pathologies. [less ▲]

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See detailContentless thinking is associated with overall positive inter-areal connectivity configurations
Mortaheb, Sepehr ULiege; Van Calster, Laurens ULiege; Boulakis, Paradeisios Alexandros et al

Poster (2021, March)

During spontaneous mentation, our minds are occupied with different contents, including periods of contentless thinking (mind blanking). As the frequency of mind blanking events is non-negligible, an ... [more ▼]

During spontaneous mentation, our minds are occupied with different contents, including periods of contentless thinking (mind blanking). As the frequency of mind blanking events is non-negligible, an emerging question is whether this mental state constitutes an accidental blip or rather a default function of our ongoing mental flow. Using fMRI experience-sampling in 36 typical subjects during which mind blanking could be chosen among various mental states, we show that mind blanking (MB) is less frequent (6%) compared to sensory-oriented (Sens, 19%), stimulus-dependent (SDep, 31%), and stimulus-independent thoughts (SInd, 43%), distributed equally across time (Chi-square uniformity test, χ2(9)=6.18, p=0.72). The probability of reporting mind blanking is low but equal when departing from the other states (Markov chain transition probability=0.06), suggesting that this state is not driven by specific mental content; also, the low probability (0.04) to re-enter mind-blanking indicates that contentless reports may be less anchoring as compared to content-oriented thinking. FMRI phase-based coherence showed that a recurrent brain pattern of overall positive functional connectivity was closer to mind blanking reports (in the sense of Euclidean distance) compared to other mental states (p=0.035 for MB vs. Sens and p<0.001 for MB vs. SDep and MB vs. SInd, linear mixed effect model and posthoc Tukey's test). This indicates that mind blanking is a default mental state supported by an over-connected brain configuration. Such overall positive connectivity can reflect a distributed fight of multiple local units to enter into the supervisory attentional system, which may hinder reportable mental content formation. [less ▲]

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See detailA MAGIC desing to study mineral nutrition in Chlamydomonas reinhardtii
Cardoso Esteves, Sara Marina ULiege; Iacono, Fabrizio ULiege; Jadoul, Alice ULiege et al

Poster (2021, March)

Natural trait variation is present across all domains of life. Individuals of the same species often present differences in response to environmental stress or in adaptation. Some traits, such as biomass ... [more ▼]

Natural trait variation is present across all domains of life. Individuals of the same species often present differences in response to environmental stress or in adaptation. Some traits, such as biomass production, have economical interest in the industrial, pharmaceutical or agricultural sectors. Identifying the genetic variants affecting these processes is, therefore, fundamental. Chlamydomonas reinhardtii is the reference unicellular photosynthetic eukaryote model organism. This haploid unicellular green alga is capable of sexual reproduction, has a high recombination rate and a very short generation interval. Furthermore, C. reinhardtii can metabolize alternative carbon sources and grow under nutrient deficiency. Studying its mineral nutrition is essential to understand adaptation to the environment. A Multiparent Advanced Generation Inter-Cross (MAGIC) design is used to study genetic variation. Eight founder lines presenting phenotypic variation were intercrossed in a determined design where each founder line contributes equally, for 8 generations. A total of 768 terminal lines, consisting of a genetic mosaic of the founder lines, were obtained. Mineral nutrition of the terminal lines is explored using mixotrophy as control condition, and 10 conditions were tested: autotrophy, 5 macronutrient deprivation, and 4 micronutrient deprivation. Cells are pre-cultured in control media for 2 days, transferred to treatment media, then harvested after 4 days. Phenotypic variation in the terminal lines of the MAGIC design largely exceeds the variability observed in founder lines, indicating that new diversity has been obtained. Together with genome sequencing of the terminal lines, the dataset will enable Quantitative Trait Loci mapping for mineral nutrition in C. reinhardtii. Financing: This project is funded by a University of Liège fellowship under the ARC project Green MAGIC [less ▲]

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See detailA spontaneous arterial thrombosis in a preterm infant
ZAMBELLI, Laura ULiege; Rigo, Vincent ULiege; VIELLEVOYE, Renaud ULiege

Poster (2021, March)

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See detailShort-Chain Chlorinated Paraffin Effects on the Expression of Key Genes of Gammarus pulex Exposed at Two Temperatures
Jaegers, Jeremy ULiege; Joaquim-Justo, Célia ULiege; Gismondi, Eric ULiege

Poster (2021, February 25)

Short-chain chlorinated paraffins (SCCPs) are organic alkanes with numerous industrial applications which are also present in some electronic devices. They are widely dispersed by wind and water, and ... [more ▼]

Short-chain chlorinated paraffins (SCCPs) are organic alkanes with numerous industrial applications which are also present in some electronic devices. They are widely dispersed by wind and water, and therefore have been found in aquatic ecosystems worldwide, where they are not readily biodegradable. Organisms may thus be exposed to them in a wide range of temperatures, a factor which is known to affect a contaminant's toxicity. Thus, this work aimed to investigate the effects of SCCPs on the relative mRNA levels of multiple genes involved in vital biological functions (osmoregulation, oxidative stress, the endocrine system, immunity and antitoxic defences) of males and females of the freshwater crustacean amphipod species Gammarus pulex. They were exposed to environmentally relevant concentrations of SCCPs (10, 100, and 1000 ng/L) at two different temperatures (16°C and 20°C). Results indicate that SCCPs significantly modulated the expression of genes from all the studied functions. Furthermore, the impact of SCCPs varies depending on temperature, exposure time, and sex. The antioxidant and endocrine systems were especially impacted in females, while the other systems were affected in both sexes equally. The expression levels of more genes were altered in females than in males. This work concludes that SCCPs modify the expression levels of genes coding for antioxidant and antitoxic defences as well as endocrine functions of G. pulex at ng/L concentrations. The effects of these contaminants are under-studied in invertebrates, however these results indicate that further investigations may be warranted and needed to understand their potential effects on freshwater ecosystems. [less ▲]

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See detailHabiter & vieillir en Wallonie : étapes de recherche doctorale
Schaff, Gwendoline ULiege

Poster (2021, February 22)

Detailed reference viewed: 46 (5 ULiège)
See detailLes normativités de l’habiter durable investies par les pratiques architecturales
Neuwels, Julie ULiege

Poster (2021, February 22)

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See detailLe vitrage architectural comme objet technique - trajectoires et cycle de vie
Junger, Mathilde ULiege

Poster (2021, February 22)

Detailed reference viewed: 24 (3 ULiège)
See detailCharacterization of the apx2 mutant in Chlamydomonas
Caccamo, Anna ULiege; Larosa, Veronique; Messens, Joris et al

Poster (2021, February 16)

One of the most common reactive oxygen species (ROS) produced in eukaryotic organisms during photosynthesis is hydrogen peroxide (H2O2) [1]. To evaluate the impact of H2O2-scavenging enzymes on algal ... [more ▼]

One of the most common reactive oxygen species (ROS) produced in eukaryotic organisms during photosynthesis is hydrogen peroxide (H2O2) [1]. To evaluate the impact of H2O2-scavenging enzymes on algal fitness, we selected a mutant deficient in ascorbate peroxidase 2 (APX2) in the green microalga Chlamydomonas reinhardtii. Ascorbate peroxidase (APX) uses ascorbate and H2O2 as substrates to form monodehydroascorbate (MDHA) and H2O. The enzyme, encoded by eight isoforms in Arabidopsis thaliana, has been already well-described in plants as one of the main actors involved in the Mehler reaction in which electrons obtained from H2O oxidation in photosystem II (PSII) are linearly transported to the acceptor side of photosystem I (PSI) where they are used to completely reduce the superoxide (O2-) to H2O [2]. In Chlamydomonas, four APX isoforms are present and APX2 is predicted to be targeted to the thylakoid membrane of the chloroplast using Target P [3]. In this study, we focus on the importance of APX2 in the Mehler reaction and during linear electron flow. To assess these two functionalities of APX2, we evaluated photosynthetic parameters under control light and high light in cells grown phototrophically and mixotrophically. Therefore, we compared the quantum yield of PSII (φPSII) by monitoring in vivo chlorophyll a fluorescence, and the photooxidation and the re-reduction rate of the PSI of wild type (WT) and apx2 mutant cells. We found that the effects of the loss of APX2 are mainly seen in cells grown phototrophically in control light. The apx2 mutant cells present a decreased rate of the relative electron transport (rETR) in phototrophic control light growth condition and the PSII efficiency resembles the one of WT under high light or H2O2 stress. We also observed a higher PSI photooxidation rate for the apx2 mutant compared to WT in cells grown phototrophically in control light, suggesting an electron donor side limitation at the level of the PSI. Further, the lower re-reduction rate of the PSI in apx2 mutant compared to the WT after a short pulse of saturating light supports our observations. All in all, the APX2 enzyme seems to exert its function under unstressful physiological condition and could be involved in the early redox poise of photosynthesis. Funded by FNRS-FWO EOS Project 30829584 [1] Asada, Plant Physiol. 141, 391 – 396 (2006) [2] Dietz et al., J. Exp. Bot. 53, 1321 – 1329 (2002) [3] Emanuelsson et al., J. Mol. Biol. 300, 4, 1005 – 106 (2000) [less ▲]

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See detailA Gas sensor array to Identify complex VOC mixtures in breath
Martin, Justin ULiege; Romain, Anne-Claude ULiege

Poster (2021, February 12)

Lung cancer is one of the deadliest form of cancer in Europe, being the first and second cause of cancer death respectively for men and women. This high death toll has to be blamed on the lack of obvious ... [more ▼]

Lung cancer is one of the deadliest form of cancer in Europe, being the first and second cause of cancer death respectively for men and women. This high death toll has to be blamed on the lack of obvious symptoms in the early stages of the illness. Current diagnostic methods tend make the screening costly and difficult to organise at a large scale. Asymptomatic subjects and people in remote areas are rarely tested overall, leading to late discovery of the cancer and poor survival chances. There is therefore a need for a diagnostic method that could be used remotely while being simple enough to be used with little prior formation. Gas sensor arrays have properties fitting for the task. This thesis aims at creating and testing a sensor array in order to build a benchmark on which one can compare the discriminative power of different arrays. Several tasks will be performed simultaneously: The first is the establishment of a standardized test method of the metrological characteristics of commercial thick film sensors as well as experimental ones, and their qualities within a sensor network. The second is the integration of experimental sensors into a prototype gas sensor array consistent with the final purpose of the device. The third is the validation of the test method with the prototype electronic nose, which requires the reproducible synthesis of reference gas mixtures. It is also planned to use real breath from healthy persons and cancer patients as validation of the benchmark’s conclusions. The last task is about the processing and analysis of data and the identification and classification of samples in order to obtain a measurement of the array’s discriminatory power. This thesis is part of the PATHACOV research project, funded by Interreg France-Wallonie-Vlaanderen. [less ▲]

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See detailRapid Test for Controlling the Quality and Integrity of Probiotic-Based Products
Razafindralambo, Hary ULiege

Poster (2021, February 01)

Probiotic-based products, including functional ingredients, fermented foods, and diet supplements, are today widely distributed in the market, owing to their recognized promoting effects on the human ... [more ▼]

Probiotic-based products, including functional ingredients, fermented foods, and diet supplements, are today widely distributed in the market, owing to their recognized promoting effects on the human, animal and plant health. However, such products are much more complex than we believe, based mainly on the living state and specificity of each microorganism strain used for their formulation. It is therefore not surprising to encounter a variability in the commercialized probiotic product quality and performance from various manufacturers and different countries, even for the same formulation brands. Consequently, it is highly expected to develop and validate a rapid standard test of quality and integrity control for probiotic-based products in order to guarantee the same performance and authenticity before their use. A thermal profiling and fingerprint generating method using a coupling thermogravimetry - differential scanning calorimetry (TGA-DSC) responds to this goal, which is the main purpose of the present communication. This calorimetric coupling technique has been recently used for the first time as a fingerprinting tool for probiotic-based powder products [1]. Such original approach provides unique qualitative and quantitative data related to the decomposition and transition phases for each probiotic powder sample, whatever its complexity, by monitoring the changes in the material mass and energetic content under a constant temperature rise with well defined conditions. This new method has a lot of advantages compared to the gold standard ones such as phenotypage and genotypage techniques for the quality control and authentication of probiotic products. It reveals not only the probiotic strain features but also those of the other functional ingredients (e.g. cryoprotectors, antioxidants, etc.) added into the formulation. In fact, these additional ingredients can also contribute to the functionality and performance of the product. In addition, the method is rapid, highly reproducible, sensitive, adaptable to a high throughput analysis, and requires only a small amount of sample without pretreatment. Its potential validity has been shown by a comparative analysis using proteomics and in vivo test of intestinal permeability [2], and inter laboratory analyses performed on a multi-strain probiotic sample reference. Besides the pure analytical aspects, this method can also provide some relevant fundamental information on the thermostability of the probiotic strains. More than 100 products containing, either mono-strain or multi-strain formulations, and pure strain samples, have been tested with this method, and each sample shows a unique qualitative profile and significant different quantitative thermophysical data. Comparative analyses with other techniques and database creation are among the future investigations to be conducted in such a promising quality and integrity control approach, which is also valuable for other food and non food products. [less ▲]

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See detailThe use of challenge studies to explore the fate of Listeria monocytogenes in artisanal cheese varieties from Belgium
Gerard, Amaury ULiege; Van Coillie, Els; Bentaib, Azeddine ULiege et al

Poster (2021, January 27)

Most cheese varieties are considered as allowing the growth of L. monocytogenes, and producers must guarantee its non-detection in 25 g before commercialization. Besides safety concerns, detection of L ... [more ▼]

Most cheese varieties are considered as allowing the growth of L. monocytogenes, and producers must guarantee its non-detection in 25 g before commercialization. Besides safety concerns, detection of L. monocytogenes can lead to harmful moral and economic consequences for producers. Defining more accurately the growth of L. monocytogenes in different types of cheese is a priority. Currently, challenge studies are the most appropriate method for this purpose. Here, the growth potential of L. monocytogenes was assessed in 32 cheese varieties using challenge studies: unripened acid-curd cheeses, mold-ripened soft cheeses, smear-ripened soft cheeses, and Gouda-type and Saint-Paulin-type semi-hard cheeses. The number of batches to include in challenge studies was determined using Sym’Previus, a predictive microbiology software. Following guidelines provided by European Union Reference Laboratory for L. monocytogenes, a cocktail of three strains was inoculated in cheese, targeting a level of 100 cfu/g. Samples were stored at 8±1°C during respective shelf-life. Growth potential was considered as the difference between contaminations at the use-by-date and at day-0. Twenty-three varieties did not allow the growth (growth potential ≤0.5 log cfu/g). Nevertheless, the calculation method recommended by guidelines led to erroneous conclusions when inter-sample variability in L. monocytogenes levels was > 0.5 log cfu/g. Alternative calculation methods could increase accuracy. [less ▲]

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See detailAdaptation française du Five-Factor Borderline Inventory , version courte
Nasello, Julian ULiege; Blavier, Adelaïde ULiege; Triffaux, Jean-Marc ULiege

Poster (2021, January 20)

Introduction : Initialement créée à partir du modèle du Big Five (Costa & McCrae, 1992), l'échelle Five-Factor Borderline Inventory, version courte (FFBI-SF ; DeShong et al., 2016) est un questionnaire de ... [more ▼]

Introduction : Initialement créée à partir du modèle du Big Five (Costa & McCrae, 1992), l'échelle Five-Factor Borderline Inventory, version courte (FFBI-SF ; DeShong et al., 2016) est un questionnaire de 48 items qui mesure 12 dimensions du trouble de la personnalité borderline. L'objectif de notre étude était d'adapter en français cette échelle psychométrique qui fournit une évaluation rapide (≈ 10 minutes), précise et différenciée de ce trouble. Méthode : nous avons recruté deux échantillons issus de la population générale : un échantillon d'étudiants universitaires (N=335) et un de travailleurs (N=162), soit un total de 497 participants. Tous les sujets devaient compléter cinq questionnaires, un questionnaire démographique, ensuite (aléatoirement) le FFBI-SF, le Big Five Inventory (BFI ; John et al., 1991), le McLean Screening Instrument for Borderline Personality Disorder (MSI-BPD ; Zanarini et al., 2003) et la version courte de la Borderline Symptom List (BSL-23 ; Bohus et al., 2001). Après une traduction suivie d’une backtranslation, nous avons réalisé des analyses exploratoire et confirmatoire afin de tester la structure en 12 facteurs du modèle. Nous avons également testé les indices de fidélité de l'échelle ainsi que la validité incrémentale et convergente. Résultats : nos résultats ont permis de démontrer que la consistance interne du questionnaire était excellente (α = .95) et, pour les dimensions, les indices étaient de satisfaisants à bons. Au niveau de la validité convergente, on constate que le FFBI-SF partage des corrélations fortes (r > .69) avec ces homologues (MSI-BPD et BSL-23), ce qui montre que ces échelles mesurent un construct similaire. Toutefois, les analyses de validité incrémentale nous montrent que le FFBI-SF offre une réelle plus-value par rapport aux deux autres échelles, étant donné qu'il apporte une part de variance supplémentaire allant de 13 à 23%. On retrouve également un pattern de corrélations similaire à celui trouvé par DeShong et al. (2016) entre FFBI-SF et BFI, ce qui montre, comme ces auteurs l'ont proposé, que les dimensions du FFBI-SF sont bel et bien une version "pathologique" de traits "normaux" de personnalité. Enfin, les indices d'adéquation du modèle étaient acceptables pour les deux échantillons (EFA : KMO = .91/.87 ; RMSEA = .0447/.0573 ; TLI = .92/.91 ; R² = .60/.64 ; CFA : SRMR = .0636/.0785 ; RMSEA = .0675/.0811 ; CFI = .823/.765 ; TLI = .803/.739). Conclusion : ces résultats montrent que l'adaptation française du FFBI-SF est fidèle et valide. De plus, l'échelle offre une appréhension multi-dimensionnelle du trouble de la personnalité borderline, contrairement aux autres échelles qui proposent une structure à un seul facteur. Dès lors, le FFBI-SF répond à un besoin croissant des chercheurs et des cliniciens de bénéficier d'outils multi-facettes présentant de bonnes qualités psychométriques, qui soient accessibles et rapidement complétés pour évaluer les troubles de la personnalité borderline. [less ▲]

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See detailPhytochemical investigation and biological activities from Lantana rhodesiensis Moldenke.
Nea, Fatimata ULiege; Bitchi, Boni Michel; Genva, Manon ULiege et al

Poster (2021, January 15)

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See detailGC×GC-TOFMS for boar taint volatolomics
Dubois, Lena ULiege; Delhaye, Myriam; Mayeres, Patrick et al

Poster (2021, January)

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See detailLes modes d'action de l' huile essentielle de Mentha arvensis sur le charançon du grenier Sitophilus granarius révélés par une analyse protéomique quantitative sans étiquette
Renoz, François; Demeter, Sébastien; Degand, Hervé et al

Poster (2021)

Bien que les pesticides synthétiques soient encore utilisés pour lutter contre les insectes ravageurs, de plus grands efforts ont été faits pour développer des pesticides plus sains et plus respectueux de ... [more ▼]

Bien que les pesticides synthétiques soient encore utilisés pour lutter contre les insectes ravageurs, de plus grands efforts ont été faits pour développer des pesticides plus sains et plus respectueux de l'environnement. En raison de leurs propriétés insecticides, les huiles essentielles botaniques (OE) sont considérées comme des alternatives prometteuses à l'utilisation d'insecticides synthétiques. Cependant, on en sait peu sur les mécanismes sous-jacents à l'activité insecticide de la plupart de ces composés naturels. Dans la présente étude, nous avons évalué la toxicité de contact et les modes d'action de l'OE de Mentha arvensis contre le charançon du grenier, Sitophilus granarius L. (Coleoptera: Curculionidae), un insecte ravageur cosmopolite qui cause des dommages importants aux céréales stockées. M. arvensis EO a provoqué une forte toxicité de contact chezS. granarius adultes, entraînant une paralysie rapide et une modification rapide du comportement de marche. Notre approche protéomique quantitative sans étiquette a révélé que M. arvensis EO induisait des changements physiologiques dramatiques chez les insectes exposés. La majorité des protéines différentiellement exprimées (DEP) ont été régulées à la hausse et sont liées au développement et au fonctionnement des systèmes musculaire et nerveux, à la respiration cellulaire, à la synthèse des protéines et à la désintoxication. Ces résultats suggèrent que M. arvensisL'huile essentielle est capable d'affecter une variété de processus biologiques et d'éclairer les mécanismes de réparation mis en place chez les insectes survivants pour contrer les dommages infligés. Ces travaux ouvrent de nouvelles perspectives sur les mécanismes proposés de l'activité insecticide d'un OE prometteur pour lutter contre les ravageurs des céréales stockées et pourraient représenter une première étape dans le développement de nouveaux insecticides bio-rationnels. [less ▲]

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See detailIsoquinoline alkaloids in the sow’s diet reduces body weight loss during lactation and increases IgG in colostrum
Arevalo Sureda, Ester ULiege; Artuso-Ponte, Valeria; Wall, Sophie-Charlotte et al

Poster (2021)

Detailed reference viewed: 40 (3 ULiège)
See detailThe impact of a child's placement on resilience and development of psychological trauma as a function of the child's intellectual abilities
Delhalle, Manon ULiege; Blavier, Adelaïde ULiege

Poster (2021)

Placement in foster care is a potentially traumatic event for children. Separating children from their home environment is a source of suffering. Although there is a growing interest in psychotrauma in ... [more ▼]

Placement in foster care is a potentially traumatic event for children. Separating children from their home environment is a source of suffering. Although there is a growing interest in psychotrauma in children, the impact of a child's placement on resilience and post-traumatic stress disorder is not clear. This study analyses the influence of the child's intellectual abilities on resilience and psychological trauma in children placed in foster care. Participants were children placed in foster care (N=10) and children from the general population (N=30) aged 6 to 12 years old. Participants completed a thorough questionnaire on their history, took an intellectual quotient (IQ) test, and answered questionnaires about their resilience and post-traumatic stress symptoms. Our results suggest that children placed in foster care differ from children from the general population with respect to their resilience and post-traumatic stress symptoms. According to our results, intellectual abilities (and in particular processing speed and fluid reasoning) are a relevant factor in the study of PTSD in children placed in foster care. Moreover, our study suggests that different factors, such as the number of placements and contact with the family, influence the severity of post-traumatic symptoms in children in foster care. [less ▲]

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See detailRecherche doctorale en Wallonie : vieillissement et architecture de l'habitat
Schaff, Gwendoline ULiege

Poster (2020, December 17)

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See detailGoing postal. L’assemblage iconographique au service de la conceptualisation ethnographique.
Kunysz, Pavel ULiege

Poster (2020, December 17)

Cette communication entend présenter les apports d’une approche méthodologique interdisciplinaire mise en oeuvre au sein d’une recherche doctorale plus large par théorisation ancrée (Glaser, Strauss 1967 ... [more ▼]

Cette communication entend présenter les apports d’une approche méthodologique interdisciplinaire mise en oeuvre au sein d’une recherche doctorale plus large par théorisation ancrée (Glaser, Strauss 1967) portant sur les utilisations des imaginaires socio-historiques des lieux dans le cadre de projets de réaménagement de friches. Nous présenterons la première phase de cette recherche au travers d’un terrain, la friche de l’ancien hôpital de Bavière (Liège) et la façon dont les données y sont successivement collectées, traitées puis analysées pour nourrir la compréhension et la transmission de ces imaginaires. Bavière est ici conçu dans une relecture plurielle du haut-lieu (Debarbieux 1993). En ce sens, l’établissement d’un portrait des imaginaires de Bavière revient également à dresser la pluralité des attachements qu’entretiennent des imagineurs aux manifestations spatiales et mémorielles du lieu. La démarche donne lieu à la production d’un portait ethnographique (Kunysz 2019) par description dense (Geertz 1973) réexploré via une traduction par assemblage iconographique laquelle fait ensuite l’objet d’une analyse sémiologique. Au centre de cette démarche se situe l’image photographique, matériau de terrain ici désignifié puis resignifié pour mieux explorer l’indicible du « sens du lieu » (Tuan 1974) dans l’espace entre les images (Didi-Hubermann 2002). La conception de cartes postales, détournant les codes d’une évocation banale de lieux permet ainsi d’interroger les rapports socio-physiques sous-tendant ceux-ci, à la manière des travaux performatifs de Takala ou Long (Vaughan 2003). L’explicitation scientifique du portrait graphique repose alors sur une analyse sémiologique par objectivation de ses isotopies (Minguet 1974 selon Calabrese 2003) et isographies (Costantitni 1980 selon Calabrese 2003). Cette approche permet la transmission simple d’informations ethnographiques complexes, l’explicitation de liens indicibles habitant les imaginaire pluriels des lieux et l’identification par comparaison des angles morts des textes ethnographiques et graphiques, nourrissant en retour l’enquête ethnographique. Enfin, le recours à l’assemblage iconographique permet une première explicitation des dynamiques d’effacement, de remplacement et d’appropriation des imaginaires sociaux et historiques des lieux évoquant les travaux sur la gentrification des esprits (Schulman 2018). Nous mettons ainsi les dynamiques d’émergence de catégories conceptualisantes par la GTM à la lumière des pratiques de design et de leurs capacités à fabriquer du sens par la conception de fictions (Schaeffer 1999). [less ▲]

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See detailThe Plasmasphere During Geomagnetic Storms
Matar, Jessy ULiege; Hubert, Benoît ULiege; Cowley, S.W.H. et al

Poster (2020, December 17)

Geomagnetic storms cause significant impacts on the magnetosphere. Brightened auroras may last for a much longer time and often extend to lower latitudes, in comparison to a typical substorm event ... [more ▼]

Geomagnetic storms cause significant impacts on the magnetosphere. Brightened auroras may last for a much longer time and often extend to lower latitudes, in comparison to a typical substorm event. However, more spectacular consequences of storms are seen in the magnetosphere a few Earth radii away from the Earth, resulting in an intensification of the energy flux of the trapped population, which consequently leads to a geomagnetic response on the global scale. Ultimately, electric fields originating from the coupling between the solar wind and the magnetosphere results in the inward displacement of the boundary between open and closed streamlines, causing inward injection of hot tenuous plasma from the outer magnetosphere and erosion of cool dense plasmaspheric plasma, which can be imaged by satellites such as IMAGE. The Earth’s plasmasphere shows great variability during intervals of intense geomagnetic activity. We investigate observations of the plasmaspheric helium ion budget and of the aurora from IMAGE EUV and FUV, respectively, combined with measurements from SuperDARN to better understand and quantify the changes in the Earth's outer radiation belt during strong storms. We show the results for two major storms on August 2000 and April 2001 with the best possible image coverage. Correlations existing between different parameters relating the trapped particles in the plasmasphere, the aurora and magnetic reconnection are deduced. We identify correlations amongst the solar wind velocity, the magnetic field, the open magnetic flux and the Dst index. We investigate more possible correlations with other geomagnetic indices. The correlation is significantly higher when we restrict the storm events to the most active intervals. We search for a relation with particle fluxes measured at geosynchronous orbit by the GOES satellite. [less ▲]

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See detailGeophysical surveys for unlocking landfill resources: from past applications to future developments
Van de Vijver, Ellen; Caterina, David ULiege; Isunza Manrique, Itzel ULiege et al

Poster (2020, December 16)

The earliest recognition of the potential of geophysical methods for characterizing landfill sites dates from over half a century ago and since then numerous case studies have been presented. In the vast ... [more ▼]

The earliest recognition of the potential of geophysical methods for characterizing landfill sites dates from over half a century ago and since then numerous case studies have been presented. In the vast majority of studies in the literature, the interest in landfill investigation relates to the assessment of associated environmental pollution problems, primarily the contamination of groundwater by landfill leachate. The landfill geometry and internal structure are recurrent targets in geophysical surveys performed in direct support of planning site remediation projects. While remediation usually involves the excavation of the disposed wastes, in which part of the excavated materials can be recycled, only a few studies have made an explicit link to landfill mining. The recent introduction of the concept of dynamic landfill management – aiming to provide an integrated framework for landfill pollution prevention, and land remediation and reclamation, including enhanced landfill mining focusing on the recovery of resources in terms of materials and/or energy – provided a new incentive to advance the use of geophysical methods as economic tools for landfill characterization. Yet, setting the waste composition and the quality of waste materials for recovery as main targets adds some new challenges to the more conventional survey practice tailored to environmental risk assessment. The extreme complexity, variability and heterogeneity that waste deposits can show, raise the ambiguity of possible interpretations of geophysical data to the next level and, hence, careful preparation is required for any investments made in geophysical investigations not to go to waste. In this contribution, we present an overview of recent applications of geophysical methods to the study of landfills of different types of waste, ages, and construction settings. We identify critical factors to successful site exploration to support landfill “mining” and formulate recommendations for the improvement of geophysical survey design and accompanying calibration and/or validation sampling in order to achieve maximal information retrieval and allow for uncertainty assessment of the obtained results. The instructions given are illustrated by examples of case studies conducted within the EU projects RAWFILL and NEW-MINE. [less ▲]

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See detailEtude technique des maisons métalliques faisant partie du patrimoine du Kongo - Central
Mpemba Nkole Kabongo, Aris ULiege; Demonceau, Jean-François ULiege; Jaspart, Jean-Pierre ULiege

Poster (2020, December 15)

La sauvegarde des bâtis historiques a pour objectif la préservation pérenne d'un patrimoine, symbole de l’identification culturelle d’un peuple ou d’une nation. La conservation de ce patrimoine est d’une ... [more ▼]

La sauvegarde des bâtis historiques a pour objectif la préservation pérenne d'un patrimoine, symbole de l’identification culturelle d’un peuple ou d’une nation. La conservation de ce patrimoine est d’une importance majeure pour un pays, une région, une ville ou un quartier dans le sens qu’il permet à une société de s’identifier à son histoire au travers de témoignages historiques tangibles et de créer ainsi son identité sociale (Groupe remmers). C’est dans ce cadre que le Fonds de la Recherche Scientifique (FNRS) finance le projet de recherche intitulé « Les expérimentations de l’architecture au Kongo Central sous l’influence des acteurs et facteurs du pouvoir colonial et du contexte local. Tropicalisation de l’ingénierie et de l’architecture ». Ce projet porte sur l'étude architecturale et technique des bâtiments en acier importés à l'époque de la colonisation, faisant maintenant partie intégrante du patrimoine bâti de la République Démocratique du Congo (RDC), mais présentant un état d'endommagement sérieux lié principalement mais pas uniquement au climat tropical de la RDC. Ce projet est mené conjointement par l'Université Libre de Bruxelles (en charge de la partie architecturale) et l’Université de Liège (en charge de la partie ingénierie). Nous présenterons les premiers travaux réalisés à l'Université de Liège ayant pour objectif l'identification des caractéristiques techniques des solutions importées à l'époque coloniale, l'identification des différentes pathologies affectant ces structures, la proposition de solutions de réhabilitation en tenant compte des pathologies identifiées et la proposition de solutions de réaffectation de ces bâtiments. En particulier, le parquet de Mbanza-Ngungu (Ancien hôtel ABC de Thysville à l’époque coloniale) sera pris comme cas d'étude afin d'illustrer les techniques utilisées et les pathologies identifiées. REFERENCES Groupe remmers. Entretien des bâtiments et monuments historiques : Protection durable des biens culturels précieux. Disponible à l’adresse https://www.remmers.be/fr_BE/protection-du-batiment-et-du-sol/entretien-des-batiments-et-monuments-historiques/c/c5960. Consulté le 30 juillet 2020. [less ▲]

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See detailLa revalorisation des produits de terroir au Maroc : reconstruction d’un patrimoine alimentaire et émancipation des productrices
M'barki, Rayyane ULiege

Poster (2020, December 15)

Au Maroc, les femmes subissent encore des discriminations liées à leur sexe. Ces injustices sont particulièrement importantes en milieu rural malgré la contribution effective des femmes au développement ... [more ▼]

Au Maroc, les femmes subissent encore des discriminations liées à leur sexe. Ces injustices sont particulièrement importantes en milieu rural malgré la contribution effective des femmes au développement local et à la valorisation des produits de terroir. Cette recherche propose une analyse du lien entre le terroir et la justice sociale et spatiale d’un point de vue genre. Elle permettra d’appréhender la manière dont l’organisation spatiale de la filière des produits de territoire influe sur et est influencée par la justice sociale de genre. [less ▲]

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See detailUntil where can we hear Polynesian coral reefs from the open ocean?
Raick, Xavier ULiege; Parmentier, Eric ULiege; Gervaise, Cédric et al

Poster (2020, December 15)

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See detailIntegrated model of insect, fish and vegetable production
Hoc, Bertrand ULiege; Tomson, Thomas ULiege; Caparros Megido, Rudy ULiege et al

Poster (2020, December 12)

Global demand for food grow while resources including feed, water and spaces are limited To supply this demand in a context of sustainable development, new production models must be developed Integrated ... [more ▼]

Global demand for food grow while resources including feed, water and spaces are limited To supply this demand in a context of sustainable development, new production models must be developed Integrated productions of insects, fishes and vegetables maximize the use of resources and limit waste production The developed model allows local production of fishes and vegetables by insect bioconversion of many organic vegetable materials with small or no value [less ▲]

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See detailMartian Discrete Aurorae Observed with MAVEN-IUVS: Spectral Composition and Altitude Modeling
Soret, Lauriane ULiege; Gérard, Jean-Claude ULiege; Ritter, Birgit ULiege et al

Poster (2020, December 11)

Three types of aurorae have been observed in the Martian atmosphere: the discrete, the diffuse (Schneider, 2015) and the proton aurora (Deighan et al., 2018, Ritter et al., 2018). This work concentrates ... [more ▼]

Three types of aurorae have been observed in the Martian atmosphere: the discrete, the diffuse (Schneider, 2015) and the proton aurora (Deighan et al., 2018, Ritter et al., 2018). This work concentrates on discrete aurorae, which were first discovered with the ESA Mars Express SPICAM instrument (Bertaux et al., 2005). Discrete aurorae are very localized in space, time and altitude (Leblanc et al., 2008, Gérard et al., 2015, Soret et al., 2016). They are generated by the precipitation of less energetic electrons than for diffuse aurorae (hundreds of eV compared to tens of keV). Bertaux et al. (2005) showed that discrete aurorae are characterized by the presence of the CO (a3Π–X1Σ) Cameron bands between 190 and 270 nm, the CO (A1Π–X1Σ+) Fourth Positive system (CO 4P) between 135 and 170 nm, the (B2Σu+–X2Πg) doublet at 289 nm, the OI at 297.2 nm and the 130.4 nm OI triplet emissions. The discrete aurora can now be studied using observations from the MAVEN-IUVS ultraviolet spectrograph (Schneider et al., 2019). More than 10,000 orbits of the IUVS instrument acquired from 2014 to 2020 have been analyzed for this study. Auroral signatures were automatically selected in 69 different orbits. The spectral emissions intensities have been quantified and the auroral event altitudes of the tangent point have been estimated using limb profiles. We confirm that the CO Cameron bands emission layer is located between 105 and 165 km (Bertaux et al., 2005, Soret et al., 2016). We also show the ratio between the CO Cameron bands and the CO2+ UVD intensities. Finally, we use the MAVEN Solar Wind Electron Analyzer (SWEA) measurements and a Monte-Carlo model to estimate the electron energy needed to produce a discrete auroral event. These results are of a great importance to understand the production mechanisms of discrete aurorae on Mars. [less ▲]

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See detailMars Discrete Aurora: A Comprehensive Survey for Detection & Characterization by MAVEN/IUVS
Milby, Zachariah; schneider, Nicholas; jain, Sonal et al

Poster (2020, December 11)

We present the results of a comprehensive search for discrete aurora emissions on Mars from six years of observations by MAVEN's Imaging UltraViolet Spectrograph. Discrete aurora is a localized and ... [more ▼]

We present the results of a comprehensive search for discrete aurora emissions on Mars from six years of observations by MAVEN's Imaging UltraViolet Spectrograph. Discrete aurora is a localized and transient form of aurora apparently unique to Mars, owing to its lack of a global magnetic field. The auroral emissions originate from precipitating electrons accelerated by the reconfiguration of Mars' crustal magnetic fields as the planet rotates relative to the external magnetic field carried by the solar wind. This process is distinct from other more widespread diffuse and proton aurora also seen at Mars. Discrete aurora was discovered in regions of strong crustal magnetic fields by the SPICAM instrument on Mars Express using limb scanning [Bertaux et al., 2005]. The emission appeared in patches ~tens of km across at altitudes ~130 km. Further analysis revealed a total of 20 instances of auroral patches during 10 years of intermittent SPICAM observations [Gérard et al., 2015]. Auroral excitation was attributed to the precipitation of electrons, typically ~100 eV - 1 keV. MAVEN/IUVS obtained the first images of the phenomenon (Schneider et al. 2018). We have examined MAVEN's mission-long dataset of nightside limb scans spanning more than 10,000 orbits over nearly 6 Earth years. Events were identified by significant emission in the CO Cameron bands (190-270 nm) and were individually confirmed to be free of stray light and cosmic ray interference. More than 500 discrete aurora events were detected, increasing the number of known events by more than an order of magnitude. The figure shows a remarkable string of distinct events seen during a single 20- minute passage of Mars' crustal field region. The observed events show a strong concentration near crustal fields in the south, but also exhibit a substantial distribution spread more uniformly over the entire planet. Some events are seen at the tangent altitude expected for electron precipitation, but many appear at lower projected altitudes. We infer these are small patches of emission in front of (or behind) the limb itself, and in some cases the spacecraft was probably imbedded in the emission. [less ▲]

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See detailFROM MEDICINAL PLANT TO THE IMPROVED HERBAL MEDICINE
Kagisha, Vedaste ULiege; Frederich, Michel ULiege; muganga, Raymond et al

Poster (2020, December 09)

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See detailInhibition multimodale et stratégies visuelles : investigation en eye-tracking
Gregoire, Coline ULiege; Noiret, Nicolas; Majerus, Steve ULiege

Poster (2020, December 01)

The unitary versus non-unitary character of inhibitory control of working memory remains an open question: does the deficit of inhibitory control affect all cognitive domains (eg, language, visual ... [more ▼]

The unitary versus non-unitary character of inhibitory control of working memory remains an open question: does the deficit of inhibitory control affect all cognitive domains (eg, language, visual processing) or are these deficits? related to specific areas and modalities? This question will be explored in a study using the eye-tracking methodology. More specifically, this method allows us to obtain live and implicit measurements on the nature and duration of cognitive processing involved in tasks involving the processing of phonological / orthographic, semantic or visual information and in which interfering information must be. inhibited. We will determine if the interfering information fixation times are the same across the three domains or if these times are longer for some of the domains. In addition, we will determine whether the interindividual differences observed in the fixation parameters for the interfering information in one domain predict the interindividual differences in another domain or not. This approach will allow us to establish a micro-analysis of the processes involved in inhibition tasks and to examine in depth the specific or common character of inhibition processes across different cognitive domains. [less ▲]

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See detailRéseaux neuronaux sous-tendant la consolidation de nouvelles informations langagières en mémoire à long terme: projet d'étude
Querella, Pauline ULiege; Attout, Lucie ULiege; Majerus, Steve ULiege

Poster (2020, December 01)

Même si le rôle de la mémoire de travail (MT) verbale dans l’apprentissage de nouvelles informations langagières est bien démontré, nous connaissons peu de choses sur la manière dont les informations ... [more ▼]

Même si le rôle de la mémoire de travail (MT) verbale dans l’apprentissage de nouvelles informations langagières est bien démontré, nous connaissons peu de choses sur la manière dont les informations transitent de la MT vers la mémoire à long terme (MLT) verbale. L’objectif de cette étude est d’examiner le rôle des substrats langagiers dans cette transition. Nous émettons l’hypothèse que la MT reflète l’activation temporaire du système langagier, mais que dans le cas d’informations nouvelles, cette activation est d’abord limitée aux représentations phonologiques pour s’étendre, au fur et à mesure des apprentissages, vers les représentations lexicales et sémantiques. Pour examiner cette hypothèse, une étude d’apprentissage verbal sur 5 jours sera réalisée. Pour déterminer les marqueurs cérébraux de nouvelles informations phonologiques en MT verbale, les participants réaliseront une première tâche de répétition de non-mots dans un scanner IRM. Ensuite, les participants prendront part dès le deuxième jour à une session d’apprentissage de paires mots/non-mots hors IRM (contenant une partie des non-mots de la première tâche et imitant un apprentissage lexical) avant de réaliser à nouveau la tâche de répétition de non-mots du premier jour. Ce schéma sera répété jusqu’au cinquième jour. Nous déterminerons si les patterns cérébraux caractérisant la répétition de non-mots avant apprentissage lexical impliquent surtout des régions temporales supérieures impliquées dans le traitement phonologique. Ensuite, nous examinerons dans quelle mesure ces patterns migrent vers des régions temporales moyennes et inférieures associées au traitement lexico-sémantique, au fur et à mesure de l’avancement de l’apprentissage. [less ▲]

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See detailInhibition visuelle et inhibition verbale : corrélats spécifiques ou communs? Une investigation par IRMf
Gregoire, Coline ULiege; Majerus, Steve ULiege

Poster (2020, December 01)

Les mécanismes cérébraux précis sous-tendant les processus d’inhibition restent actuellement peu compris. Une question cruciale reste celle de la spécificité des processus d’inhibition en fonction du ... [more ▼]

Les mécanismes cérébraux précis sous-tendant les processus d’inhibition restent actuellement peu compris. Une question cruciale reste celle de la spécificité des processus d’inhibition en fonction du domaine cognitif. L’objectif de ce projet en IRMf est de mieux comprendre le caractère spécifique ou commun des processus d’inhibition dans le domaine langagier et dans le domaine visuel. Nous allons également adopter une approche life-span, en déterminant si ce caractère spécifique ou commun des corrélats cérébraux des processus d’inhibition est identique chez le sujet adulte jeune et âgé. Des adultes jeunes (20-40 ans) et des adultes âgés (60-80 ans) seront installés dans un scanner IRM et réaliseront des tâches de mémoire à court terme de jugement de similarité, impliquant de l’inhibition phonologique, sémantique ou visuelle. Via des analyses univariées classiques et des analyses multivariées (Multivariate Voxels Patterns Analysis) nous examinerons si les mêmes réseaux cérébraux et les mêmes patterns d’activation multivariée au sein de ces réseaux caractérisent les processus d’inhibition 1) à la fois dans les tâches de MCT et de jugement, 2) pour les informations phonologiques, sémantiques et visuelles, et 3) à la fois auprès du sujet adulte jeune et de la personne âgée. Des résultats pilotes seront présentés. [less ▲]

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See detailA virtual audience for public speaking: A pilot study
Menjot, Pauline; Leclercq, Anne-Lise ULiege; Schyns, Michael ULiege et al

Poster (2020, December 01)

Background. Public speaking is one of the most feared activities, with approximately two-thirds of undergraduates afraid to speak in public (Ferreira Marinho et al., 2017). This form of anxiety has ... [more ▼]

Background. Public speaking is one of the most feared activities, with approximately two-thirds of undergraduates afraid to speak in public (Ferreira Marinho et al., 2017). This form of anxiety has consequences on communication performance (King & Finn, 2017), particularly on speech fluency (Goberman et al., 2011), and quality of speech can influence a speaker’s career success (Wörtwein et al., 2015). While the literature highlights the benefits of public speaking training on communication performance (Goberman et al., 2011), its implementation is complex. Therefore, virtual reality (VR) seems to be an innovative and relevant tool for clinicians. Aims. This study aims to validate the use of a virtual audience for public speaking by assessing its capacity to elicit emotional (i.e. anxiety) and behavioral (i.e. disfluencies) responses confirming its ecological validity. Methodology. Eight participants made an oral presentation in front of a virtual audience. Their speech disfluencies and anxiety were analyzed. They also completed questionnaires assessing the quality of VR based on the feeling of presence and side effects (i.e. cybersickness). Results. The emotional (anxiety) and behavioral responses (speech disfluencies), the sufficient feeling of presence, and the absence of cybersickness suggest that this virtual audience can be a relevant tool for public speaking training and rehabilitation. Conclusions. This pilot study is the first step in a long-term project. It highlights the positive points of a virtual audience as well as those requiring improvement. Further studies are needed to enhance this virtual environment and statistically confirm its ecological validity. References: - Ferreira Marinho, A. C., Mesquita de Medeiros, A., Côrtes Gama, A. C., & Caldas Teixeira, L. (2017). Fear of Public Speaking: Perception of College Students and Correlates. Journal of Voice, 31(1), 7-11. https://doi.org/10.1016/j.jvoice.2015.12.012 - Goberman, A. M., Hughes, S., & Haydock, T. (2011). Acoustic characteristics of public speaking: Anxiety and practice effects. Speech Communication, 53(6), 867–876. https://doi.org/10.1016/j.specom.2011.02.005 - King, P. E., & Finn, A. N. (2017). A test of attention control theory in public speaking: cognitive load influences the relationship between state anxiety and verbal production. Communication Education, 66(2), 168–182. https://doi.org/10.1080/03634523.2016.1272128 - Wörtwein, T., Chollet, M., Schauerte, B., Morency, L.-P., Stiefelhagen, R., & Scherer, S. (2015). Multimodal Public Speaking Performance Assessment. International Conference on Multimodal Interaction, 43–50. https://doi.org/10.1145/2818346.2820762 [less ▲]

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See detailPerformance study of interferometric small-sats to detect exoplanets: Updated exoplanet yield and application to nearby exoplanets
Dandumont, Colin ULiege; Kammerer, Jens; Defrere, Denis ULiege et al

Poster (2020, December)

Nulling interferometry is considered as one of the most promising solutions to spectrally characterize rocky exoplanets in the habitable zone of nearby stars. It provides both high angular resolution and ... [more ▼]

Nulling interferometry is considered as one of the most promising solutions to spectrally characterize rocky exoplanets in the habitable zone of nearby stars. It provides both high angular resolution and starlight mitigation. It requires however several technologies that need to be demonstrated before a large interferometry space-based mission flies. A small-sat mission is a good technological precursor. Based on a Bracewell architecture1, this unique satellite can demonstrate some key components (null capability, fiber injection, achromatic phase shifter). Scientific capabilities of such a mission are presented. An exoplanet detection yield is derived, and we show that the detection of exoplanets around nearby stars is feasible. [less ▲]

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See detailThe role of inland freshwaters in summer CO2, CH4 and N2O emissions from north-eastern Siberian Arctic tundra
Martyn Rosco, M; Dean, J; Borges, Alberto ULiege et al

Poster (2020, December)

Inland waters are an ubiquitous feature of Arctic landscapes, with carbon (C) and nutrient cycles that are closely coupled to terrestrial processes. They act as important conduits of terrestrial matter by ... [more ▼]

Inland waters are an ubiquitous feature of Arctic landscapes, with carbon (C) and nutrient cycles that are closely coupled to terrestrial processes. They act as important conduits of terrestrial matter by not only transporting but also actively storing and processing it, subsequently emitting greenhouse gases (GHG) of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O)to the atmosphere. Amplified climate warming at northern high-latitudes is changing contemporary carbon and nitrogen cyclesand driving permafrost thawing which has the potential to mobilise organic matter from vast stocks stored in Arctic tundra permafrost soils. Released carbon and nitrogen becomes available to degradation producing GHGs which inland waters emit to the atmosphere, thus forming a positive feedback to climate change. GHG emissions from tundra ecosystems vary regionally with local environmental and climate factors. Dissolved GHG concentrations in collected samples from the Indigirka watershed were measured and fluxes computed during three growing seasons (2015, 2016, 2017) to provide insight into the role of each type of aquatic system in this region. Fluvial CO2 and CH4fluxes (85.7 ± 29.7 mmol C/m2/ d, 10.6 ± 27.3 mmol C/m2/ d, respectively mean ± STD) were the highest, followed by pond fluxes (30.0 ± 21.0 mmol C/m2/ d, 4.9 ± 9.4 mmol/m2/ d) and finally fluxes from lake sites (8.6 ± 7.6 mmol C/m2/ d, 0.84± 0.57 mmol/m2/ d). The aim of this study was to quantify the effect of inland water emissions on the landscape C exchange. This was done by using remote sensing information to upscale emissions and integrate them into the terrestrial C exchange of the study area. As N2O has a large warming potential and received scant attention in the Arctic biome so far its contribution to terrestrial aquatic fluxes wasalso assessed. The effect of an extensive flooding event in 2017 on the landscape GHG exchange was also evaluated since increased flooding occurrence is what climate change might hold for this region. Greater insight into these aspects will increase understanding of GHG dynamics among inland waters in the north-eastern Siberian Arctic tundra lowlands which is essential for forecasting, climate-impact-assessment and to better constrain the feedback to climate warming. [less ▲]

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See detailFunctional response of attention-related cortical networks to multi-sessions tRNS
Pergher, Valentina; Contò, Federica; Paparella, Ilenia ULiege et al

Poster (2020, December)

Background: Transcranial Random Noise Stimulation (tRNS) has been shown to facilitate visual-attention abilities. Yet, the impact of this type of stimulation alone on brain dynamics remains to be ... [more ▼]

Background: Transcranial Random Noise Stimulation (tRNS) has been shown to facilitate visual-attention abilities. Yet, the impact of this type of stimulation alone on brain dynamics remains to be determined. Aim: We investigated the effect of off-line multi-session tRNS on brain activity and visual-attention behavior. We hypothesized that parietal stimulation would impact brain activity related to attentional processes that could consequently facilitate behavior. Methods: 28 healthy subjects participated in a 5-day experiment and were assigned to one of four conditions in a between-subject design: two active conditions (tRNS was delivered over hMT+ or over parietal cortex) and two no-stimulation conditions (sham and behavioral only). From day 1 to day 4 subjects received stimulation (depending on their condition) while at rest. On day 5, brain activity was recorded while subjects performed the visual-attention task. Results: Parietal tRNS significantly modulated brain activity compared to control groups. However, no difference in performance was found. Conclusion: Our findings demonstrate that off-line multi-session parietal tRNS has a long-lasting impact on brain activity but not on behavior. This study shows that this type of stimulation can be efficient alone to influence brain states and such stimulation efficacy could be advantageous in the rehabilitation context where active patients’ collaboration is not always possible. Furthermore, this study is a starting point to exploit the physical properties of this stimulation method to influence the cortex. [less ▲]

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See detailComparison of ICON O+ density profiles with electron density profiles provided by COSMIC-2 and ground-based ionosondes
Wautelet, Gilles ULiege; Hubert, Benoît ULiege; Gérard, Jean-Claude ULiege et al

Poster (2020, December)

In October 2019, NASA-ICON was launched to observe the low-latitude ionosphere using in-situ and remote sensing instruments, from a LEO circular orbit at about 575 km altitude. The six satellites of the ... [more ▼]

In October 2019, NASA-ICON was launched to observe the low-latitude ionosphere using in-situ and remote sensing instruments, from a LEO circular orbit at about 575 km altitude. The six satellites of the radio-occultation program COSMIC-2 were also successfully launched and currently provide up to 3000 electron density profiles on a daily basis since October 1, 2019. Besides, the network of ground-based ionosondes is constantly growing and allows retrieving very accurate measurements of the electron density profile up to the peak altitude. These three sources of scientific observation of the Earth ionosphere therefore provide a very complementary set of data. We compare O+ density profiles provided during nighttime by the ICON-FUV instrument and during daytime by the ICON-EUV instrument against electron density profiles measured by COSMIC-2 and ionosondes. Co-located and simultaneous observations are compared on statistical grounds, and the differences between the several methods are investigated. Particular attention is given to the most important variables, such as the altitude and the density of the F-peak, hmF2 and NmF2. The time interval considered in this study covers the whole ICON data availability period, which started on November 16, 2019. Manual screening and scaling of ionograms is performed to ensure reliable ionosonde data, while COSMIC-2 data are carefully selected using an automatic quality control algorithm. A particular attention has been brought to the geometry of the observation, because the line-of-sight integration of both airglow and radio-occultation measurements assimilates horizontal and vertical gradients. As a consequence, the local density profiles obtained by inversion of the ICON and COSMIC-2 observation cannot be exactly assimilated to vertical measurements, such as vertical incidence soundings from ionosondes. This slightly limits the reach of the interpretation of the comparison between data of different origin. However, using similar observing geometries, the comparison of ICON and COSMIC-2 data does nevertheless provide very reliable and valuable comparisons. [less ▲]

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See detail2-3D dynamic numerical modelling of seismically induced rock slope failures
Havenith, Hans-Balder ULiege; Mreyen, Anne-Sophie ULiege; Lemaire, Emilie ULiege

Poster (2020, December)

The stability of rock slopes is often guided significantly by the structural geology of the rocks composing the slope. In this work, we analyse the influence of structural characteristics, and of their ... [more ▼]

The stability of rock slopes is often guided significantly by the structural geology of the rocks composing the slope. In this work, we analyse the influence of structural characteristics, and of their seismic response, on large and deep-seated rock slope failure development. The study is focused on the Tamins and Fernpass rockslides in the European Alps and on the Balta and Eagle’s Lake rockslides in the southeastern Carpathians. These case studies are compared with catastrophic rock slope failures with ascertained or very likely seismic origin in the Tien Shan Mountains. The main goal is to identify indicators for seismically induced rock slope failures based on the source zone rock structures and failure scar geometry. We present examples of failures in anti-dip slopes and along-strike rock structures that were potentially (or partially) caused by seismic triggering, and we also consider a series of mixed structural types, which are more difficult to interpret conclusively. This morpho-structural study is supported by 2D and 3D distinct element numerical models of the Balta site (with reconstructed initial mountain morphology) showing that seismic shaking typically induces deeper-seated deformation in initially ‘stable’ rock slopes. In addition, for failures partially triggered by seismic shaking, these studies can help identify the contribution of the seismic factor to slope instability. The identification of the partial seismic origin on the basis of the dynamic response of rock structures can be particularly interesting for case histories in less seismically active mountain regions (in comparison with the Andes, Tien Shan, Pamirs), such as in the European Alps and the Carpathian Mountains. 3D models were also run to simulate the full rock avalanche process, including the formation of a dam on the valley floor. [less ▲]

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See detailAquatic Ecosystems are the Most Uncertain but Potentially Largest Source of Methane on Earth
Rosentreter, JA; Borges, Alberto ULiege; Raymond, PA et al

Poster (2020, December)

Atmospheric methane is a potent greenhouse gas that has tripled in concentration since pre-industrial times. The causes of rising methane concentrations are poorly understood given its multiple sources ... [more ▼]

Atmospheric methane is a potent greenhouse gas that has tripled in concentration since pre-industrial times. The causes of rising methane concentrations are poorly understood given its multiple sources and complex biogeochemistry. Natural and human-made aquatic ecosystems, including wetlands, are potentially the largest single source of methane, but their total emissions relative to other sources have not been assessed. Based on a new synthesis of inventory, remote sensing and modeling efforts, we present a bottom-up estimate of methane emissions from streams and rivers, freshwater lakes and reservoirs, estuaries, coastal wetlands (mangroves, seagrasses, salt-marshes), intertidal flats, aquaculture ponds, continental shelves, along with recently published estimates of global methane emissions from freshwater wetlands, rice paddies, the continental slope and open ocean. Our findings emphasize the high variability of aquatic methane fluxes and a possibly skewed distribution of currently available data, making global estimates sensitive to statistical assumptions. Mean emissions make aquatic ecosystems the largest source of methane globally (53% of total global methane emissions). Median emissions are 42% of the total global methane emissions. We argue that these emissions will likely increase due to urbanization, eutrophication and climate change. [less ▲]

Detailed reference viewed: 42 (3 ULiège)
See detailModified peptides as a novel immunotherapy for rheumatoid arthritis
Araklioti, Eleni ULiege; Herman, Ludivine; Nguyen, Ngoc Quynh Nhu et al

Poster (2020, December)

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See detailStudy of the opto-electronic properties of Cu2ZnXS4 (X=Sn,Ge,Si) kesterites as input data for solar cell efficiency modelling
Ratz, Thomas ULiege; Raty, Jean-Yves ULiege; Brammertz, Guy et al

Poster (2020, November 26)

In this work, first principle calculations of Cu2 ZnSnS4 (CZTS), Cu2 ZnGeS4 (CZGS) and Cu2 ZnSiS4 (CZSS) are performed to highlight the impact of the cationic substitution on the structural, electronic ... [more ▼]

In this work, first principle calculations of Cu2 ZnSnS4 (CZTS), Cu2 ZnGeS4 (CZGS) and Cu2 ZnSiS4 (CZSS) are performed to highlight the impact of the cationic substitution on the structural, electronic and optical properties of kesterite compounds. Direct bandgaps are reported with values of 1.32, 1.89 and 3.06 eV respectively for CZTS, CZGS and CZSS. In addition, absorption coefficient values of the order of 10^4 cm^{−1} are obtained, indicating the applicability of these materials as absorber layer for solar cell applications. In the second part of this study, ab initio results (absorption coefficient, refractive index and reflectivity) are used as input data to model the electrical power conversion efficiency of kesterite-based solar cell. In that perspective, we used an improved version of the Shockley-Queisser theoretical model including non-radiative recombination via an external parameter defined as the in- ternal quantum efficiency. Based on predicted optimal absorber layer thicknesses, the variation of the solar cell maximal efficiency is studied as a function of the non-radiative recombination rate. Maximal efficiencies of 25.88 %, 19.94 % and 3.11 % are reported respectively for Cu2ZnSnS4, Cu2ZnGeS4 and Cu2ZnSiS4 for vanishing non-radiative recombination rate. Using a realistic internal quantum efficiency which provides 𝑉OC values comparable to experimental measurements, solar cell efficiencies of 15.88, 14.98 and 2.66 % are reported respectively for Cu2ZnSnS4, Cu2ZnGeS4 and Cu2ZnSiS4 (for an optimal thickness of 1.15 𝜇m). With this methodology we confirm the suitability of Cu2ZnSnS4 in single junction solar cells, with a possible efficiency improvement of 10% enabled through the reduction of the non-radiative recombination rate. In addition, Cu2ZnGeS4 appears to be an interesting candidate as top cell absorber layer for tandem approaches whereas Cu2ZnSiS4 might be interesting for transparent photovoltaic windows. [less ▲]

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See detailThe edible caterpillar “Mikombidila”, one of the caterpillars consumed in the west of the Democratic Republic of Congo : Description, life cycle and breeding
Numbi Muya, Gloria Marceline ULiege; Caparros Megido, Rudy ULiege; Francis, Frédéric ULiege et al

Poster (2020, November 23)

In the Democratic Republic of Congo (DRC), caterpillars provide up to 40% of all animal protein consumed and contributes to addressing the problems of food insecurity and poverty in the country. A great ... [more ▼]

In the Democratic Republic of Congo (DRC), caterpillars provide up to 40% of all animal protein consumed and contributes to addressing the problems of food insecurity and poverty in the country. A great proportion of western part population of the DRC consumes caterpillars on a daily basis in their feeding habits. In this region of the country, the edible caterpillar called Mikombidila is also consumed by the inhabitants and are highly appreciated for its excellent taste. Nevertheless, this species is only available in small quantities. This species naturally feeds on a semi-recumbent annual grassy plant with ascending or erect stems up to 60 cm high, called Boerhavia diffusa L., belonging to the Nyctaginaceae family. Research on this caterpillar species is almost non-existent. Very few authors have described its life cycle. After rearing them under laboratory conditions, an identification of the adults has been carried out. This identification indicates that individuals belong to the Noctuidae family and Agaristinae subfamily and represents potentially the Aegocera rectilinea Boisduval 1836 species. The preliminary data on the biology of this species obtained at the end of the observation phase are as follows: it is a multivoltine species with a developmental cycle of ≈30 days (egg incubation ≈ 3 days, larval development ≈ 15 days, pupation ≈ 12 days) and an adult life span of≈ 6 days. Therefore, furthers studies are currently under process to characterize precisely its life cycle parameters and feeding preferences in order to set up a efficient and inexpensive breeding system for a rural and sustainable exploitation of the Mikombidila caterpillar in DRC. [less ▲]

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See detailA non-common case of parietal fibrinous peritonitis in Belgian blue heifer without a history of laparotomy
Djebala, Salem ULiege; Evrard, Julien; Moula, Nassim ULiege et al

Poster (2020, November 20)

A 19 months old Belgian Blue heifer was referred to the Veterinary Clinic of Liege University. The heifer was 2 months pregnant by artificial insemination performed by the farmer, and presented ... [more ▼]

A 19 months old Belgian Blue heifer was referred to the Veterinary Clinic of Liege University. The heifer was 2 months pregnant by artificial insemination performed by the farmer, and presented hyperthermia, anorexia and weight loss. Rectal palpation revealed a large, depressible abdominal mass. Diagnosis of parietal fibrinous peritonitis (PFP) was made by ultrasound, revealing a liquid and fibrin filled cavity attached to the abdominal wall. Blood analysis indicated an inflammatory status. Analysis of a PFP fluid sample confirmed bacterial contamination. Treatment, apart from fluids, antibiotics and non-steroidal anti-inflammatory drugs, consisted of surgical drainage and repeated flushing of the cavity. Complete resorption of the cavity was observed after 5 weeks. The heifer remained pregnant but died 7 months later, after elective caesarean section, due to generalized peritonitis. This is the first report of PFP in an animal without a history of laparotomy. The PFP may have been caused by an insemination induced trauma. [less ▲]

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See detailFlexor Surface of the distal sesamoid bone: do we see the same at ultrasound and magnetic resonance imaging?
Vandersmissen, Maxime ULiege; De La Rocha Lopesino, Luis ULiege; Dancot, Michaël ULiege et al

Poster (2020, November 20)

The objective of this study was to compare ultrasonographic and magnetic resonance imaging features of the facies flexoria in 13 cadaver limbs with no known history of lameness. Overall, fibrocartilage ... [more ▼]

The objective of this study was to compare ultrasonographic and magnetic resonance imaging features of the facies flexoria in 13 cadaver limbs with no known history of lameness. Overall, fibrocartilage thickness was better assessed on MR images, but this modality presented a high number of false-positive results. Ultrasonography had a poorer sensitivity than magnetic resonance imaging but better specificity (however conserving a fairly high number of false-positive results). [less ▲]

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See detailEvaluation of the proximal subchondral bone plate in the equine proximal phalanx: intra- and inter-observer agreement for thickness and sharpness
Vandersmissen, Maxime ULiege; Devoto, Giulia ULiege; Dancot, Michaël ULiege et al

Poster (2020, November 20)

The aim of this study was to evaluate the intra- and inter-observer agreement in the evaluation of sharpness loss at the subchondral/trabecular bone interface of the proximal subchondral bone plate of the ... [more ▼]

The aim of this study was to evaluate the intra- and inter-observer agreement in the evaluation of sharpness loss at the subchondral/trabecular bone interface of the proximal subchondral bone plate of the proximal phalanx, and lateromedial asymmetry of the proximal subchondral bone plate of the proximal phalanx, as indicators of SCB sclerosis. The present study demonstrated an overall moderate agreement for assessment of the SCB plate of P1 in 11 isolated limbs, suggesting that subjective radiographic evaluation may be of interest in clinical settings. [less ▲]

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See detailCA19.9 assays provide clinically different results for the patients
Schoneveld, Lauranne ULiege; LUKAS, Pierre ULiege; CAVALIER, Etienne ULiege et al

Poster (2020, November 20)

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See detailGeolocation and temporal distribution of equine atypical myopathy cases in Belgium and France from years 2006 to 2019
Stern, David ULiege; Fettweis, Xavier ULiege; Renaud, Benoît ULiege et al

Poster (2020, November 20)

Atypical myopathy (AM) is a severe and often fatal muscle disorder arising from ingestion of toxins contained in sycamore maple (Acer pseudoplatanus) seeds and seedlings. Progresses in research to ... [more ▼]

Atypical myopathy (AM) is a severe and often fatal muscle disorder arising from ingestion of toxins contained in sycamore maple (Acer pseudoplatanus) seeds and seedlings. Progresses in research to diagnose and treat AM after intoxication are moving forward, but the acuteness of the disease with a fatality rate of ~75% reinforces the need for preventive measures. The condition is a seasonal disorder. Ingestions of Samaras (seeds) in autumn and seedlings the following spring causes two subsequent clinical case series, with a majority of cases observed in autumn. [less ▲]

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See detailA MAGIC design to study metal homeostasis in Chlamydomonas reinhardtii
Cardoso Esteves, Sara Marina ULiege; Iacono, Fabrizio ULiege; Jadoul, Alice ULiege et al

Poster (2020, November 17)

Natural trait variation is present across all domains of life. Individuals of the same species often present differences in response to environmental stress or adaptation. Some traits, such as biomass or ... [more ▼]

Natural trait variation is present across all domains of life. Individuals of the same species often present differences in response to environmental stress or adaptation. Some traits, such as biomass or High Value Molecule production, have economical interest in the industrial, pharmaceutical or agricultural sectors. Identifying the genetic variants affecting important biological processes is, therefore, fundamental. Chlamydomonas reinhardtii is the reference unicellular photosynthetic eukaryote model organism. C. reinhardtii is a haploid unicellular green alga capable of sexual reproduction, metabolize alternative carbon sources, growing in the dark and under nutrient deficiency. Furthermore, C. reinhardtii has very short generation interval, a high recombination rate and a relatively small genome, making it a suitable organism for a MAGIC design. In model organisms, genetic variation can be studied using Multiparent Advanced Generation Inter-Cross (MAGIC) designs. In these designs, lines of founders presenting phenotypic variation are intercrossed in a determined design where each founder line contributes equally. This process originates terminal lines where the initial variability is shuffled, forming a genetic mosaic of the founder lines. Three MAGIC designs, consisting of 8 initial founders intercrossed for 8 generations (F8) were made, and a total of 768 progenies were selected in order to study mineral nutrition. Metal homeostasis is assured by an intricate network of metal uptake, chelation, trafficking, and storage processes. Mixotrophy was used as control condition, and 10 conditions were tested: autotrophy, macronutrient deprivation (Ca, Mg, N, P, S), and micronutrient deprivation (Cu, Fe, Mn, Zn), in 96h assays. Here we present the preliminary results of a small subset. [less ▲]

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See detailRADIATION PROTECTION OPTIMIZATION IN FIXED INDUSTRIAL RADIOGRAPHY-BASED PHITS MONTE CARLO CODE SIMULATION
Guembou Shouop, Cébastien Joel ULiege

Poster (2020, November 12)

Nondestructive test (NDT) has been widely used for defects detection, well joints inspection, and material integrity verification in recent decades. Gamma radiography’s applications in industry are known ... [more ▼]

Nondestructive test (NDT) has been widely used for defects detection, well joints inspection, and material integrity verification in recent decades. Gamma radiography’s applications in industry are known as high risk-related techniques among the nuclear-related industries nowadays. For example, the IAEA safety report about the lesson learned from accidents in industrial radiography reported that around 45 % of accidents in the nuclear industry accounted for industrial radiography in both developed and developing countries [1]. This demonstrates the need to optimize safety and protection measures around gamma sources used in fixed industrial radiography. The present study focuses on the optimization of engineering barriers during the sitting and construction phases of such facilities. Monte Carlo methods-based PHITS are used to optimize the shielding design of enclosures of a radiographic facility to create a safe working environment for both radiographers and the public. The Particle and Heavy Ion Transport code System [2, 3] was used to determine the appropriate concrete wall and dose estimation to keep radiation As Low As Reasonably Achievable (ALARA). As shown in Fig.1, there are many concerns in old built facilities and few in new ones, but the primary objective is to provide radiological protection regulation or to update and optimize the existing regulation, taking into consideration the shielding design of the facility As the radiation exposure to any given material depends on the thickness of the shielding, the quantity, and the energy of the radiation, both Co-60 and Ir-192 sources were used in our study as they are the most used high-energetic radionuclides used in industrial radiography. The MC code used for computation, PHITS, is a general-purpose Monte Carlo Particle and Heavy Ion Transport code System developed by a collaboration between Japanese institutions and Europe. The version used, PHITS 3.10 with several changes, allows the simulation of photon and other particles of interest transport over a wide range of energy. The design principle here is based on providing enough shielded enclosure to keep the dose rates out of the facility (in the closest adjacent areas to the facility) lower than 2.5 μSv/h, in adherence to the ALARA principle for the public exposure. If not, a large exclusive area should be set, but this part is considered as administrative controls, which are discussed differently. The facility design was based on the IAEA safety report series [7] and the photon flux distribution simulated is presented in Fig. 2 along with the plot of the dose conversion factor used for computation. Appropriate concrete thickness to shield radiation from isotropic sources was computed prior to the radiographic testing room design. The minimum concrete wall thickness for the facility using Co-60 sources described previously was found to be 120 cm while it was found to be 70 cm for Ir-192 related facility as shown in TABLE 2. To ensure that the radiation dose falls under the recommended limits set either by international organizations as IAEA, or by the regulatory authority of Cameroon, the necessary and appropriate shielding walls and shielding materials shall be installed and regulated by laws. It is recommended to the government, conjointly with the NRPA of Cameroon, to make a law project in this regard that will be passed in view to facilitate the regulation of the wide-spreading practice of industrial radiography using radioactive sources, especially gamma imaging. The present code could be really helpful to the Government of Cameroon in developing a database for sitting and construction of radiographic testing rooms depending on the radionuclide type, its energy and intensity, and its activity. Appropriate design-based maze technology was developed by Guembou in his thesis [6]. There is a real need for the implementation of the international rules and the adoption of clear and specific national guides for the application of industrial radiography in Cameroon as well as in different other countries. Different IAEA safety standards series, safety reports series, and technical documents were provided to help governments, institutions, and individuals involved in the use of radioactive sources for industrial radiography to develop an appropriate safety culture. In this regard, enclosures of a radiographic room should be properly designed and used for the sources for which they were designed, considering the maximum activity, the type of radioisotope, their energy, and intensity. Developing countries as Cameroon could use MC simulation for national regulation improvement according to their socioeconomic statute and technology-based considerations. [less ▲]

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See detailIntegrative analysis of small RNA signatures of serum-derived extracellular vesicles in estrogen- treated Cyprinus carpio
Alhassan, Solomon Oguche ULiege; Valenzuela Nieto, Guillermo E.; Muller, Marc ULiege et al

Poster (2020, November)

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See detailMetagenetic approach to explore the gut microbiota and their secreted extracellular vesicles in diarrheic and healthy patients.
Rodriguez Diaz, Cristina ULiege; Taminiau, Bernard ULiege; Martin-Reyers, F. et al

Poster (2020, October 28)

The release of membrane-bound vesicles is a conserved cellular process. Gram-positive and Gram-negative secrete nanometer-scale extracellular membrane vesicles (EMV) with important biological functions ... [more ▼]

The release of membrane-bound vesicles is a conserved cellular process. Gram-positive and Gram-negative secrete nanometer-scale extracellular membrane vesicles (EMV) with important biological functions, including immune-response regulation, long distance transport of virulence factors, lateral transfer of antibiotic resistance genes, or RNA transfer agents, among others. For Clostridium difficile (C. difficile), these vesicles have been associated with the infection (CDI), since they can induce the expression of pro-inflammatory genes and epithelial cells cytotoxicity.The aim of this study was to evaluate the microbial diversity of feces and secreted EMV in healthy patients, diarrheic patients and patients with CDI. The link between microbiota composition and their derived EMV could reveal newt insights into the microbial activities in the host. Furthermore, the identification of these changes opens up new possibilities of disease diagnostic and assessment. EMV were enriched in the 3 groups of patients, but their composition differed significantly between them. Regarding global differences between feces and EMV, Lachnoclostridium and Streptococcus were more abundant in feces, but their vesicles production was limited and dominated by Faecalibacterium. At genus level, proportions of Clostridioides, Staphylococcus and Enterococcus were significantly higher in vesicles from CDI patients than in the other groups. These findings suggest that the increased production of EMV by these taxa could be associated with the dysbiosis establishment, and therefore with the development of the infectious disease. More extensive research to investigate the specific role of the identified EMV in the CDI is now warranted. [less ▲]

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See detailMise en place d'un dispositif soutenant la réalisation d'un entretien anamnestique de qualité auprès d'étudiants en première année de master en orthophonie
Leroy, Sandrine ULiege; Willems, Sylvie ULiege; Maillart, Christelle ULiege

Poster (2020, October 24)

Contexte : Quotidiennement, les orthophonistes sont amenés à prendre des décisions cliniques importantes afin de proposer à leurs patients le traitement le plus efficace possible. En accord avec la ... [more ▼]

Contexte : Quotidiennement, les orthophonistes sont amenés à prendre des décisions cliniques importantes afin de proposer à leurs patients le traitement le plus efficace possible. En accord avec la perspective de l’evidence-based practice, cette prise de décisions constitue un processus complexe qui nécessite de combiner différentes variables dont les connaissances quant aux préférences du patient (Dollaghan, 2007). Ainsi, les valeurs, choix et attentes de ce dernier interviennent largement dans les prises de décisions cliniques. L’entretien anamnestique constitue un moment privilégié pour aborder ces différents éléments avec le patient. Il est donc important que tous les étudiants soient spécifiquement entraînés à une démarche centrée sur le patient. Objectif : L’objectif consiste à proposer un dispositif permettant aux étudiants inscrits en première année de master en orthophonie de développer une démarche réflexive leur permettant de mener un entretien anamnestique de qualité, au cours duquel le patient est placé au centre, l’impact fonctionnel du trouble est pris en considération et menant à une prise de décision partagée. Méthodologie : Les trente-deux étudiants de Master 1 inscrits en orthophonie à l’Université de Liège (année 2019-2020) ont participé à ce dispositif. Celui-ci s’est déroulé en différentes étapes : (1) une étape pré-dispositif ; (2) 4 étapes appartenant au dispositif en tant que tel, allant de l’analyse de la vidéo d’un professionnel à l’analyse de sa propre pratique avec un parent fictif ; et (3) une étape post-dispositif. Les mesures pré- et post-dispositif sont prises suite à la réalisation d’un jeu de rôle mené par les étudiants en binôme, l’un jouant le patient, l’autre l’orthophoniste. La vignette clinique proposée lors des deux étapes est identique. Les performances des étudiants sont analysées et mesurées à l’aide d’une adaptation française du « Calgary-Cambridge Guide to communication : Process skills » (Kurtz, Silverman & Draper,1998). Résultats et discussion : Les données sont en train d’être récoltées et seront discutées. Une étude préliminaire prometteuse, menée auprès de 6 étudiants, a déjà montré des différences significatives. Nous nous attendons à ce que les étudiants améliorent leurs performances et qu’ils soient capables de mettre le patient au centre de l’entretien anamnestique [less ▲]

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