References of "Scientific congresses and symposiums"
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See detailTree Ensemble Methods and Parcelling to Identify Brain Areas Related to Alzheimer’s Disease
Wehenkel, Marie ULg; Bastin, Christine ULg; Phillips, Christophe ULg et al

in 2017 International Workshop on Pattern Recognition in Neuroimaging (PRNI), proceedings (2017, June)

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See detailThe Use of Inflammatory Markers in Field Cattle Medicine
Guyot, Hugues ULg

in ACVIM Forum Proceedings (2017, June)

Numerous cow-side diagnostic tests are available for bovine practitioners. Many of these tests serve etiologic purposes such as quick test for diarrhea or measures of metabolites directly linked to ... [more ▼]

Numerous cow-side diagnostic tests are available for bovine practitioners. Many of these tests serve etiologic purposes such as quick test for diarrhea or measures of metabolites directly linked to pathologies (BOH or ions Ca++, Na+, K+, etc.). Beside these interesting elements, inflammation, which is either a cause or a consequence of a specific disease, is often forgotten. This presentation will refresh the practitioner’s knowledge on the assessment of inflammation in cattle by using inflammatory markers assayed with laboratory and cow-side tests. The interpretation of these markers can be sometimes delicate (bias) and might not necessarily lead to a prognosis. Depending on the age of the animal, some inflammatory markers can also serve as diagnosis for other purposes such as the evaluation of passive immunity transfer in calves. [less ▲]

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See detailUsing electric vehicles as flexible resource in power systems: A case study in the Netherlands
Beltramo, Agnese; Julea, Andreea; Refa, Nazir et al

in Proceedings of the 14th International Conference on the European Energy Market (2017, June)

The European Union (EU) is actively encouraging member countries to phase out traditional oil-fuelled cars in cities in favour of Electric Vehicles (EV) as a solution for increasing efficiency ... [more ▼]

The European Union (EU) is actively encouraging member countries to phase out traditional oil-fuelled cars in cities in favour of Electric Vehicles (EV) as a solution for increasing efficiency, contributing to ensure security of supply, decrease CO2 emission and decrease local (especially urban) air pollution coming from the transport sector. With the increasing associated charging infrastructure deployment all over European countries, the demand coming from these technologies might impact the power system and potentially offer a source of flexibility through variable charging profiles and battery storage capacity options. In the recent years, the Dutch government has adopted several policy support mechanisms for EVs uptake, which made the Netherlands the country with the highest market share of electric cars in 2015 in the EU, and the second-highest share worldwide after Norway. This country is therefore a unique case study for the analysis of EVs charging demand and impact of the power sector. The recent uptake of EVs provides a significant amount of historical data regarding charging profiles, connection times or utilisation patterns pertaining this technology. This paper aims at exploiting such data to evaluate the current and future impact of electric vehicle deployment on the power system. To that end, historical data from 2015 are used in conjunction with the Dispa-SET model, a unit commitment and power dispatch model developed at the Joint Research Centre (JRC) of the European Commission. This aims at investigating the impact of Battery Electric Vehicle (BEV) charging demand on the current Dutch power system, under different hypotheses for BEV technology penetration and renewable energy deployment (i.e. wind and solar) in the country. In addition, looking at the entire connection periods when vehicles are plugged to the grid, the battery capacity connected to the system is estimated, based on commercial BEV battery characteristics. This total capacity is finally used as variable storage unit in the model, in order to investigate the impact that Vehicle to Grid (V2G) strategies could have on the optimal use of power resources available, with particular attention to Variable Renewable Energy (VRE). [less ▲]

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See detailThe Split-Band Interferometry Approach to Determine the Phase Unwrapping Offset
Libert, Ludivine ULg; De Rauw, Dominique ULg; d'Oreye, Nicolas et al

Poster (2017, June)

This poster presents an approach based on the Split-Band Interferometry to solve the ambiguities introduced during the phase unwrapping of separate regions.

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See detailStaggered strong coupling between existing fluid and solid solvers through a Python interface for fluid-structure interaction problems
Thomas, David ULg; Variyar, Anil; Boman, Romain ULg et al

in Proceedings of the VII International Conference on Coupled Problems in Science and Engineering (2017, June)

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See detailLeibniz and the Polyp, or the Metaphysical Puzzle of Life
Dony, Arthur ULg

in Scienza e Philosophia (2017, June), 17

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See detailThe Delivery of Bad News to Customers in Service Encounters: An Employee Perspective
Delcourt, Cécile ULg; Gremler, Dwayne; Greer, Dominique

Conference (2017, June)

During service encounters, customer contact employees often need to deliver bad news: unexpected information contrary to the customer’s wellbeing. For example, technicians regularly tell customers that ... [more ▼]

During service encounters, customer contact employees often need to deliver bad news: unexpected information contrary to the customer’s wellbeing. For example, technicians regularly tell customers that none of the data on their computer hard drive can be retrieved, veterinarians often inform owners that a beloved pet has cancer and cannot be cured, and airline staff regularly tell travelers that their flights have been cancelled due to bad weather. For some customer-contact employees, delivering bad news is an unavoidable, delicate, and emotionally-charged task that occurs regularly. Disclosing bad news can be highly stressful and perhaps detrimental for (1) customers, (2) customer- contact employees, and (3) service firms in general. Accordingly, it is crucial for service organizations to better understand bad news encounters (i.e., situations during which customer contact employees must deliver negative information) to better equip their managers and employees to deliver such news to customers. The topic of how to best deliver bad news has been broached in various disciplines, including the medical literature (e.g., Baile et al. 2000, 2002; Rosenbaum et al. 2004), the management literature (e.g., Bies 2013; Kothari, Shu, and Wysocki 2009), and the sociology literature (e.g., Clark and LaBeff 1986). These literatures have (1) examined the attitudes and emotions of the discloser of extreme bad news in very specific contexts, (2) identified the tactics used by disclosers, and (3) developed protocols for delivering extremely negative information. Surprisingly, studies of bad news delivered by contact employees are scarce in service research. Service failure and service recovery have received much attention, but this literature has two major gaps when it comes to understanding the delivery of negative information. First, service recovery research generally skips over the initial part of the process where employees first communicate bad news to customers, and instead focuses primarily on the process involved to resolve the situation. Second, there are many situations in which employees must deliver negative information to customers where it is clear that a service failure has not occurred (e.g., informing a customer that his 30-year old dishwasher is beyond repair). We use the critical incident technique (CIT) (Flanagan 1954; Gremler 2004) to analyze 200 incidents where service employees from a wide range of service sectors had to deliver bad news to a customer. [less ▲]

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See detailVariable selection in proportional hazards cure model with time-varying covariates, application to bank failures
Beretta, Alessandro ULg; Heuchenne, Cédric ULg

Conference (2017, June)

In the last three decades, as a consequence of failures and corporate actions, the number of commercial banks in the United States has shrunk by two thirds. Empirical evidence in the analysis of bank ... [more ▼]

In the last three decades, as a consequence of failures and corporate actions, the number of commercial banks in the United States has shrunk by two thirds. Empirical evidence in the analysis of bank failures suggests the existence of banks which are not susceptible to default. For this reason, we use a semi-parametric proportional hazards cure model with time-varying covariates to study their effects either on the probability that a bank is susceptible to default and on the survival time of failed institutions. We propose a penalized maximum likelihood method for the selection of the most significant variables, using a Smoothly Clipped Absolute Deviation (SCAD) penalty. A simulation study shows that this procedure performs reasonably well. We apply this methodology to a quite large sample of United States commercial banks insured by the Federal Deposit Insurance Corporation (FDIC) and with more than 50 million dollars of total assets during the last quarter of 2002. More in detail, we use bank-specific covariates observed on a quarterly basis until the end of 2015, that we use as proxies for capital adequacy, asset quality, earnings, management efficiency, liquidity, cost structure and size. [less ▲]

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See detailMultimodal imaging analysis in Charles Bonnet Syndrome: a case report
Martial, Charlotte ULg; Di Perri, Carol ULg; Larroque, Stephen ULg et al

Poster (2017, June)

Charles Bonnet syndrome (CBS) is a rare condition characterized by visual impairment associated with complex visual hallucinations in psychologically normal elderly people. Previous studies have suggested ... [more ▼]

Charles Bonnet syndrome (CBS) is a rare condition characterized by visual impairment associated with complex visual hallucinations in psychologically normal elderly people. Previous studies have suggested that visual hallucinations may be caused by brain damage in the visual system. However, in the case of CBS, specific brain regions in the occipital cortex have not been clearly determined and functional neuroimaging remains relatively unexplored. To our knowledge, functional connectivity by means of resting-state magnetic resonance imaging (MRI) has never been investigated in patients with CBS. We here aimed to investigate structural imaging, brain metabolism and functional connectivity in a patient with CBS. Resting-state functional and structural MRI were acquired in an 85-year-old patient with CBS and 12 age- and gender-matched normally sighted controls. Cognitive functioning was measured by behavioral assessment. A seed-based resting state fMRI was performed to investigate the default mode network (DMN), the executive control network and the visual networks connectivity. A voxel-based morphometry (VBM) analysis was employed to investigate the grey matter volume. Cortical and subcortical grey matter thickness were further investigated. Finally, 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) was also acquired to observe regional glucose uptake by comparing standard uptake values (SUVs). Increased functional connectivity was found between the DMN and the temporo-occipital fusiform cortex, as well as between the secondary visual cortex and the left frontal cortex, in the CBS patient compared to controls. The patient also demonstrated increased functional connectivity between the primary visual cortex and the left supramarginal gyrus and between the associative visual cortex and the superior temporal gyrus/angular gyrus, as compared to controls. Decreased grey matter volume was observed in the lateral occipital cortex/angular gyrus in our patient as compared to controls. Diminished grey matter thickness values were observed in the lateral geniculate nucleus compared to healthy controls. FDG-PET results confirmed previous work and showed bilateral hypometabolism in the occipital cortex (mean SUV reduction of 5.36%, p<0.001). Our results suggest that structural alterations in visual system in CBS are associated with compensatory/adaptive changes in functional connectivity that involve regions known to support hallucinations of faces in CBS patients. We suggest that this functional connectivity reorganization following visual structural damage may contribute to visual hallucinations. These findings might shed light on the pathophysiology underlining this rare condition. [less ▲]

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See detailE-CLOUD, the open microgrid in existing network infrastructure
Vangulick, David ULg; Cornélusse, Bertrand ULg; Vanherck, Thierry et al

in Proceedings of the 24th International Conference on Electricity Distribution (2017, June)

The main goal of the E-Cloud, as with every microgrid, is to maximize the consumption of energy produced locally. To reach this goal, based on consumption profiles of customers willing to participate in ... [more ▼]

The main goal of the E-Cloud, as with every microgrid, is to maximize the consumption of energy produced locally. To reach this goal, based on consumption profiles of customers willing to participate in the E-cloud and given some local restrictions (e.g. wind turbines cannot be put everywhere), an optimal mix of green generation sources (in kW) and local storage (in kWh) needs to be computed. Then according to this computation, the required generating units and storage device are installed. A repartition mechanism grants the customer a share of the generated electricity and storage capacity. These shares are either computed offline, or dynamically adapted on line. The project will test two models: either the DSO or a producer owns and operates the storage device. Two flows of information (real-time for operation of the storage facility and ex-post for its settlement) are needed to correctly manage the E-Cloud and to ensure correct information exchange with the wholesale market. These information flows are completed thanks to a forecast that provides members of the E-Cloud the full capability to anticipate and obtain the maximum benefits of the local generation. The expected benefits for the customer are a reduction of their electricity bill by a minimum of 10%. Societal benefits should also arise: 1) easing the technical integration of renewables’ generation embedded in the distribution network, and 2) avoids extra investment on the DSO network. The E-Cloud may also ensure new revenue for the DSO thanks to new services provided to the E-Cloud community. [less ▲]

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See detailAutomatic phase identification of smart meter measurement data
Olivier, Frédéric ULg; Ernst, Damien ULg; Fonteneau, Raphaël ULg

in Proc. of CIRED 2017 (2017, June)

This paper highlights the importance of the knowledge of the phase identification for the different measurement points inside a low-voltage distribution network. Besides considering existing solutions, we ... [more ▼]

This paper highlights the importance of the knowledge of the phase identification for the different measurement points inside a low-voltage distribution network. Besides considering existing solutions, we propose a novel method for identifying the phases of the measurement devices, based exclusively on voltage measurement correlation. It relies on graph theory and the notion of maximum spanning tree. It has been tested on a real Belgian LV network, first with simulated unbalanced voltage for which it managed to correctly identify the phases of all measurement points, second, on preliminary data from a real measurement campaign for which it shows encouraging results. [less ▲]

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See detailDevelopment of a unified model for flow-material interaction applied to porous charring ablators
Coheur, Joffrey ULg; Schrooyen, Pierre; Turchi, Alessandro et al

Conference (2017, June)

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See detailDocumenting the parameters of effective SoTL counselling
Jérôme, Françoise ULg; Verpoorten, Dominique ULg; Detroz, Pascal ULg

in Andersson, Roy; Martensson, Katarina; Roxa, Torgny (Eds.) Proceedings of the 2nd EuroSoTL Conference (2017, June)

The Specialized Master in Higher Education Pedagogy (Formasup) organized at the University of Liège (Belgium) aims at the professional development of teachers involved in Higher Education. The training ... [more ▼]

The Specialized Master in Higher Education Pedagogy (Formasup) organized at the University of Liège (Belgium) aims at the professional development of teachers involved in Higher Education. The training programme gives participants the opportunity to make a full-scale SoTL study (from the implementation of a well-circumscribed course regulation to the assessment of its pedagogical effectiveness by means of the analysis of collected data) of one prominent aspect of their teaching practice. The process of trying out some new pedagogical approach and of discussing its effects on student learning has also to be reported in the form of a scientific paper (including a short review of the relevant pedagogical literature) and presented to a small audience of teacher colleagues. In order to meet the many requirements of such a complex task, each participant benefits from individualized pedagogical counselling. Besides a brief description of the Formasup context, the present contribution proposes brief case studies of three SoTL projects carried out in 2016. The case studies focus mainly on the dynamics of the interaction between teacher and pedagogical counsellor at each constitutive step of the SoTL project with the intention of making out the specificities of counselling applied to first time SoTL experience (time dedicated to and types of counselling activities in relation to the particularities of individual projects). The case studies are then integrated into a bigger picture drawing upon a larger number of counselling experiences over the last four years (from 2013 to 2016). On the basis of the main characteristics of 21 counselling experiences we propose a typology of teacher profiles according to their strategic approach to SoTL and the corresponding input of counselling. [less ▲]

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See detailHic Sunt NATs: Uncovering Address Translation with a Smart Traceroute
Zullo, Raffaele; Pescapé, Antonio; Edeline, Korian ULg et al

in IEEE/IFIP Workshop on Mobile Network Measurement (MNM) (2017, June)

Middleboxes are pervasive in today's Internet as they are deployed for an increasing number of reasons. An example is the network address translation (NAT), one of the first task to be performed to cope ... [more ▼]

Middleboxes are pervasive in today's Internet as they are deployed for an increasing number of reasons. An example is the network address translation (NAT), one of the first task to be performed to cope with the lack of IPv4 addresses. Recently the landscape for NATs has become even more crowded, especially in mobile networks, mainly due to the impossibility of IPv6 to be a large-scale solution to addressing issues. In this paper, we present a novel methodology for detecting NATs embodied in Mobile Tracebox, a measurement tool for Android smart devices that detects a wide range of middleboxes. It analyzes ICMP time-exceeded messages received during \traceroute and points at IP and transport checksum inconsistencies in the embedded packets to uncover address translation along a path. We deployed Mobile Tracebox through a crowdsourcing approach and used the collected dataset to validate our methodology. Results showed that, in absence of middleboxes breaking \traceroute, it can help to detect and locate NATs in the majority of the cases. [less ▲]

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See detailDecoding the disciplines – A pilot study at the University of Liège (Belgium)
Verpoorten, Dominique ULg; Devyver, Julie ULg; Duchâteau, Dominique ULg et al

in Andersson, Roy; Martensson, Katarina; Roxa, Torgny (Eds.) Proceedings of the 2nd EuroSoTL Conference - Transforming patterns through the scholarship of teaching and learning (2017, June)

This paper reports on a first attempt to apply the two first stages of the “Decoding the disciplines” framework (Pace, 2017) at the University of Liège (Belgium). In this context, 7 professors volunteered ... [more ▼]

This paper reports on a first attempt to apply the two first stages of the “Decoding the disciplines” framework (Pace, 2017) at the University of Liège (Belgium). In this context, 7 professors volunteered to reflect, through a structured process, upon “bottlenecks” in their courses, with the help of IFRES’ (Institute for Training and Research in Higher Education) pedagogical advisers. This pilot delivered contrasted observations: while participants granted value to their exposure to this approach, especially in terms of enhanced awareness of possible discrepancies between what experts and newcomers in the field might consider as obvious, none of them activated the possibility offered to tackle the identified bottlenecks, according to the systematic approach (stages 3-7) suggested by the framework. The paper presents the pedagogical setting, analyses the interviews of participants and the outcomes of the project, outlines explanations for its results, and shares some lessons learnt. [less ▲]

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See detailEfficient management of a connected microgrid in Belgium
Cornélusse, Bertrand ULg; Ernst, Damien ULg; Warichet, Luc et al

in Proceedings of the 24th International Conference on Electricity Distribution, Glasgow, 12-15 June 2017 (2017, June)

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See detailShallow water model with anisotropic porosity for flood modelling on Cartesian grids
Bruwier, Martin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Conference (2017, June)

Detailed topographic data have become widely available for inundation mapping. While the use of such high-resolution data enables the computation of flow variables at a fine scale, the computation time ... [more ▼]

Detailed topographic data have become widely available for inundation mapping. While the use of such high-resolution data enables the computation of flow variables at a fine scale, the computation time remains too high for many practical applications. In contrast, models solving the shallow-water equations with porosity provide a useful tool to improve the computational efficiency, while preserving to some extent the detailed topographic information through porosity parameters. In this study, we present a new model solving the fully dynamic shallow water equations with anisotropic porosity based on Cartesian grids. Using a Cartesian grid leads to specific challenges, particularly as regards the definition of the conveyance porosities at the cell edges. Moreover, the presented model is further improved by a merging method so as to increase the computational efficiency without affecting the overall accuracy. The performance of the model has been evaluated based on a wide range of test cases, which confirm the validity of the model and the benefits of such a modelling framework. [less ▲]

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See detailChallenges of Trace Mineral Diagnosis
Guyot, Hugues ULg

in ACVIM Forum Proceedings (2017, June)

Trace elements deficiencies are commonly seen in cattle herds in Europe and in some parts of the USA. Many reasons are involved: economics of the cattle industry, nutrients formulation and legislation ... [more ▼]

Trace elements deficiencies are commonly seen in cattle herds in Europe and in some parts of the USA. Many reasons are involved: economics of the cattle industry, nutrients formulation and legislation, depletion of soil and roughages quality. The clinical signs of the deficiencies are rarely pathognomonic but loss of production, impaired reproduction performances or increased morbidity/mortality rates are mostly observed. In a European critical economic context, especially for milk production, it is not easy to convince the farmer to invest in diagnosis and/or trace mineral supplementation. Nevertheless, it is important to investigate the nutritional status of the herd to improve global herd health. This presentation aims to present the interest of the diagnosis of trace mineral deficiencies as well as the different manners to investigate this nutrition trouble at a herd level. Trace mineral supplementation solutions will be briefly discussed. [less ▲]

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See detailNumerical simulations of a non-charring ablator in high enthalpy flows by means of a unified flow-material solver
Schrooyen, Pierre; Coheur, Joffrey ULg; Turchi, Alessandro et al

Conference (2017, June)

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See detailDynamic stall onset variation with reduced frequency for three stall mechanisms
Boutet, Johan ULg; Dimitriadis, Grigorios ULg; Amandolese, Xavier

in Proceedings of the IFASD 2017 Conference (2017, June)

Asetofunsteadyaerodynamicloadmeasurementisperformedonthreeoscillating airfoils with distinct stall mechanisms: a flat plate, a NACA0012, and a NACA0018. The airfoils are forced to oscillate in pitch ... [more ▼]

Asetofunsteadyaerodynamicloadmeasurementisperformedonthreeoscillating airfoils with distinct stall mechanisms: a flat plate, a NACA0012, and a NACA0018. The airfoils are forced to oscillate in pitch around the stall angle of attack with prescribed frequency and amplitude. A criterion proposed by Sheng et al. is used to locate the onset of the flow separation process associated with dynamic stall, and quantify its variation with an equivalent reduced pitch rate. The validity of this criterion is tested for the three airfoils at low Reynolds number, Re = 2 × 10^4. Results are compared with the experimental data obtained by Sheng et al. at higher Reynolds number of Re = 1.5 × 10^6. [less ▲]

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See detailSuperconducting weak links created by electromigration
Silhanek, Alejandro ULg

Conference (2017, June)

In this presentation, we explore in-situ controlled electromigration to fabricate superconducting weak links. We show evidence that in Al a transition from thermally assisted phase slips (TAPS) to quantum ... [more ▼]

In this presentation, we explore in-situ controlled electromigration to fabricate superconducting weak links. We show evidence that in Al a transition from thermally assisted phase slips (TAPS) to quantum phase slips may takes place when the effective cross section becomes smaller than ~150 nm2. In the regime dominated by quantum phase slips the nanowire loses completely its capacity to carry current without dissipation, even at the lowest possible temperature. We also discuss the origin of negative magnetoresistance at low magnetic fields in the bow-tie shaped constrictions. Strikingly, the detrimental effect caused by the repeated electromigration can be healed by simply inverting the current direction. These findings reveal perspectives of the proposed fabrication method for exploring various fascinating superconducting phenomena in atomic size constrictions. [less ▲]

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See detailResilience of the DSO network near to 50.2Hz
Vangulick, David ULg; Ernst, Damien ULg; Van Cutsem, Thierry ULg

in Proceedings of the 24th International Conference on Electricity Distribution (2017, June)

In an electrical system where decentralized and embedded productions are becoming more and more important, it is essential to ensure there is a good understanding of their behaviour at their operating ... [more ▼]

In an electrical system where decentralized and embedded productions are becoming more and more important, it is essential to ensure there is a good understanding of their behaviour at their operating limits. One the most important operating limits is when the system frequency approaches 50.2 Hz. At this frequency, following the old requirements, many existing European PV inverters have to be disconnected. In such situations, we will demonstrate that the variance of the frequency measurement taken at every PV inverter plays a key role. It will be demonstrated that this variance is actually a good thing from the system’s point of view as it allows for a gradual disconnection, leading to a controlled variation of the frequency. [less ▲]

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See detailProfiling inferior left dorsal premotor cortex: when Area 55b meets Premotor Eye-Field
Genon, Sarah ULg; Reid, Andrew; Langner, Robert et al

Poster (2017, June)

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See detailSafety update on dapagliflozin (DAPA) across the phase 2b/3 clinical trial program
Jabbour, Serge; Seufert, Jochen; SCHEEN, André ULg et al

Poster (2017, June)

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See detailMicroplastics found in the stomach contents of Squalius cephalus from the Seine River
Collard, France ULg; Gilbert, Bernard ULg; Eppe, Gauthier ULg et al

Poster (2017, June)

Microplastics (plastics < 5 mm) are emerging pollutants of growing concern. Since the 2000s their abundance, degradation and impacts on wildlife are more and more studied and understood. However, few data ... [more ▼]

Microplastics (plastics < 5 mm) are emerging pollutants of growing concern. Since the 2000s their abundance, degradation and impacts on wildlife are more and more studied and understood. However, few data are available particularly in freshwater ecosystems. Some fish species have plastic in their stomach contents such as: Gobio gobio, Alburnus alburnus, Leuciscus leuciscus while other species have not. In controlled conditions, microplastics were found to cause negative impacts in fish: leaching of micropollutants, endocrine disruption, hatching inhibition and decrease of growth rate of larvae. The first step in the understanding of these impacts is the quantification and the characterisation of ingested plastics by organisms in the field. Plastics and other anthropogenic particles (textile fibres) were isolated from 40 stomachs of Squalius cephalus (the European chub) collected in the Seine River (Paris) in August 2016. One station is upstream and the three others are downstream of the Paris Megacity conurbation. This megacity exerts a great pressure on the Seine River. Plastics were isolated thanks to a method using sodium hypochlorite and all particles were then analysed by Raman spectroscopy. The method consists in a degradation overnight of the organic matter in the stomach contents by sodium hypochlorite. This mixture is then filtrated and particles longer than 5 µm are resuspended into an ethanol (99%) solution for centrifugation. The precipitate, containing all particles denser than ethanol, is collected (1.3 ml) and spread on a mount for Raman spectroscopy. Several lasers were used, depending on the particle’s colour. Spectra were recorded with an accumulation ranging from 5 to 50s. Preliminary results showed that 7 individuals out of 25 already analysed (28%) had ingested at least one anthropogenic particle (AP). Eight APs were found and characterized, the majority of them (7) being dyed fibres. One of these fibres was made of a plastic polymer, the polyethylene terephthalate. The others were made of an undetermined material as Raman analyses gave only information on the dye. The eighth particle was a fragment of polypropylene. It is the first time that fish are studied as a part of plastic pollution in the Seine River. All isolated particles have been analysed leading to precise results. The percentage of occurrence is in the common range of other studies while much lower than the European flounder coming from the River Thames and higher than fish coming from Geneva Lake. It is not surprising that the majority of APs were fibres as another study in the river Seine found that the fibres concentration in water is far greater than the fragments concentration, as well as in urban runoff. It is also possible that the retention time of fibres in the gut is longer than fragments. Toxicological impacts of fibre ingestion is still unknown despite their ubiquity in many freshwater environments. [less ▲]

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See detailVoltage Profile Correction in Distribution Grids Combining Single- and Two-level Controllers
Soleimani Bidgoli, Hamid ULg; Van Cutsem, Thierry ULg

in IEEE PES 2017 PowerTech conference proceedings (2017, June)

A real-time control scheme is proposed to correct undesired voltages in distribution networks by adjusting the reactive powers produced by Dispersed Generation Units (DGUs). This is performed at two ... [more ▼]

A real-time control scheme is proposed to correct undesired voltages in distribution networks by adjusting the reactive powers produced by Dispersed Generation Units (DGUs). This is performed at two levels: locally, in DGU controllers, and centrally by a supervisory controller acting on some of the DGUs only. The centralized, discrete controller solves a multi-time-step constrained optimization inspired of Model Predictive Control. Unacceptable voltage deviations are partially but rapidly corrected by the local controls. Further but slower corrections are applied by the upper level, taking advantage of the coordination between DGUs. This hybrid control is of practical interest where the deployment of the upper level control is not feasible or affordable over all DGUs. The proposed method effectiveness is demonstrated on a 75-bus test system. [less ▲]

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See detailLong-term monitoring of European eels in the Belgian Meuse River basin. From the historical drastic decline to recent outcomes of restocking practices.
Nzau Matondo, Billy ULg; Dierckx, Arnaud ULg; Benitez, Jean-Philippe ULg et al

Conference (2017, June)

Long-term monitoring of yellow- and glass eel stages were performed in upland areas (>300km from sea) in order (i) to quantify the decline of wild yellow eels entering in the Belgian Meuse from the ... [more ▼]

Long-term monitoring of yellow- and glass eel stages were performed in upland areas (>300km from sea) in order (i) to quantify the decline of wild yellow eels entering in the Belgian Meuse from the Netherlands; (ii) to follow their upstream individual colonization; and (iii) to analyze the adaptation of young eels stocked as glass eels imported from UK. By monitoring a fish pass from 1992 to 2016, we quantified that the number of ascending eels has declined from n=5613 in 1992 to n=21 in 2016 (3.99%/year) and the mean length of eels has increased (4.1mm/year). During 6-years, upstream individual colonization of eels (2010-2015, n=1371) was followed using fixed RFIDtracking system. Few eels continued to migrate 4 years after tagging (<0.3%) and at >20km upstream (3.7%); and velocity of eels varied between individuals (0.012- 3.1km/day). In a 4-year (2013-2016) monitoring study of restocked glass eels using electrofishing and mobile RFID-tracking campaigns, we observed that eels grew rapidly in upland small brooks and recruitment was better in rivers with high carrying capacity (>15.8%, 2years post-stocking). Restocked eels dispersed in up- and downstream directions with behaviors including sedentary, nomadic and intermediate lifestyles. This suggests stocking as potential management measure to enhance local eel stocks. [less ▲]

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See detailNew data on the Mesozoic radiation of chelonioids
Scavezzoni, Isaure ULg; Fischer, Valentin ULg

Poster (2017, June)

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs ... [more ▼]

"Turtles" (Testudines) form a successful group of reptiles with several terrestrial, marine and fresh-water species. Their peculiar and somewhat constrained morphology (i. e. : carapace incorporating ribs, curved limbs, anapsid skull exempt of temporal fenestrae) and ecology has often obscured their relationships and, hence, their evolutionary history, notably in marine turtles (chelonioids). Modern chelonioids are divided in two clades (i. e. : shoft-shelled turtles and hard-shelled turtles) supported by distinct morphological and embryological characters. Their origin is traced back up to the Cretaceous, along with a series of extinct forms, many of which being collectively known as Protostegidae. Fossil evidence show that at least five clades of marine turtles were roaming the seas at the end of the Cretaceous. In fact, chelonioids appeared during the first stages of the Early Cretaceous and quickly exploded to reach a high level of disparity at the lowermost part of the late Cretaceous. Therefore, the Mesozoic radiation of chelonioids must have happened during the "middle" Cretaceous (especially the Aptian-Albian interval). However this radiation is poorly understood as the phylogenetic relationships of marine turtles are not resolved yet. Bringing new data may help resolve these issues, and it is the exact reason why the genus Rhinochelys is being investigated. [less ▲]

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See detailGelfand duality for compact pospaces
De Rudder, Laurent ULg

Conference (2017, June)

It is well known that the category of compact Hausdorff spaces is dually equivalent to the category of commutative C^\star-algebras. More generally, this duality can be seen as a part of a square of ... [more ▼]

It is well known that the category of compact Hausdorff spaces is dually equivalent to the category of commutative C^\star-algebras. More generally, this duality can be seen as a part of a square of dualities between compact Hausdorff spaces, C^\star-algebras, compact regular frames and de Vries algebras. Three of these dualities have been extended to dualities between compact pospaces, stably compact frames and proximity frames, the fourth part of the square being lacking. We propose the category of bounded Archimedean l-semi-algebra to complete what will be the outside square of dualities and to extend to category of C^\star-algebras. [less ▲]

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See detailTowards a Renewed Alias Resolution with Space Search Reduction and IP Fingerprinting
Grailet, Jean-François ULg; Donnet, Benoît ULg

in Network Traffic Measurement and Analysis Conference (TMA) (2017, June)

Since the early 2000's, the Internet Topology has been frequently described and modeled from the perspective of routers. To this end, alias resolution mechanisms have been developed in order to aggregate ... [more ▼]

Since the early 2000's, the Internet Topology has been frequently described and modeled from the perspective of routers. To this end, alias resolution mechanisms have been developed in order to aggregate all IP interfaces of a router, collected with traceroute, into a single identifier. So far, many active measurement techniques have been considered, often taking advantage of specific features from network protocols. However, a lot of these methods have seen their efficiency decrease over time due to security reinforcements across the Internet. In this paper, we introduce a generic methodology to conduct efficient and scalable alias resolution. It combines the space search reduction of TreeNET (a tool for efficiently discovering subnets) with a fingerprinting process used to assess the feasibility of several state-of-the-art alias resolution methods, using a small, fixed amount of probes. We validate our method along MIDAR on an academic groundtruth and demonstrate that our methodology can achieve similar accuracy while using less probes and discovering subnets in the process. We further evaluate our method with measurements made on PlanetLab towards several distinct ASes of varying sizes and roles in the Internet. The collected data shows that some properties of our fingerprints correlate with each other, hinting some observed profiles could be linked with equipment vendors. Both TreeNET (which implements our methodology) and our dataset are freely available. [less ▲]

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See detailUntargeted serum metabolite profiling of colorectal cancer using GC-Orbitrap technology
Di Giovanni, Nicolas ULg; Cojocariu, C; Silcock, P et al

Poster (2017, June)

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See detailCoulombic driven multi-conformational aspects of oligorotaxane switches studied by ion mobility mass spectrometry and molecular dynamics
Hanozin, Emeline ULg; Mignolet, Benoît ULg; Morsa, Denis ULg et al

Conference (2017, June)

Introduction Artificial Molecular Machines (AMMs), such as Mechanically Interlocked Molecules (MIMs) and foldamers, have recently raised tremendous interest due to their unique properties. Under the ... [more ▼]

Introduction Artificial Molecular Machines (AMMs), such as Mechanically Interlocked Molecules (MIMs) and foldamers, have recently raised tremendous interest due to their unique properties. Under the influence of an appropriate stimuli (pH, redox potential, light…), such molecules are able to reversibly switch between distinct conformational states. Scientists may capitalize on such exclusive properties to get a better understanding of the biomacromolecular level or to design innovative “smart” materials. At the interface between foldamers and MIMs, oligorotaxanes exhibit a spring-like folded secondary structure with remarkable mechanical and physicochemical properties. In the present study, we use ion mobility coupled with mass spectrometry (IM-MS) to probe the conformational states of differentially charged oligorotaxanes in the gas phase. Method Oligorotaxanes are donor-acceptor polymers composed of a π electron-donating dumbbell over which a discrete number of π electron-accepting tetracationic cyclophanes are threaded. The numerous intra-molecular interactions provide them a highly-stabilized rigid rod-like structure in solution. We use IM-MS as implemented in the Synapt G2 HDMS (Waters, Manchester, UK) to investigate the structure of the ionized oligorotaxanes. Our purposes are to probe (i) the different populations of stable conformers generated according to the charge state z and (ii) the reversibility of an electron-driven or thermal-driven conformational change in the gas phase implemented via an electron transfer or collisional activation process prior to the mobility separation. Our experimental observations are supported by electronic structure optimizations at the PM6 and DFT levels coupled with Born-Oppenheimer Molecular Dynamics simulations. Preliminary data Our results highlight a progressive elongation of the oligorotaxane structure with increasing charge numbers until it reaches a maximum extension state. Matching the experimental data with theoretical simulations, we find that the oligorotaxanes adopt an entropically-favored globular shape at low z. As z increases, coulombic repulsions occurring between the cyclophanes gradually outweigh the stabilizing π-stacking interactions and force the structure to elongate. This process occurs in a multistep fashion, each corresponding to a distinct group of helical-shaped conformers, before it eventually results in a fully stretched structure. On the other hand, our results also highlight that a charge reduction driven by a non-dissociative electron transfer process leads to a refolding of the structure so that it adopts a size similar to its electrospray-generated counterpart when the appropriate number of electrons is added. This observation may be imparted to the gradual decrease of the Coulomb repulsions between the cyclophanes mediated through increasing numbers of transferred electrons. These results suggests that the transition from one conformer to another is reversible so that the electrostatic balance between the cyclophanes may be used to further tune the structural state adopted by this artificial molecular switch. The second stimulus relied on collisional activation whose inelastic component provides a way to build up energy into the accessible vibrational degrees of freedom. The conformational landscapes of such-activated oligorotaxanes ions were found unchanged in term of collision cross section position but the repartition of population was altered with a promotion of the most elongated conformer, provided the absence of selective fragmentation. Altogether, these results highlight the feasibility of handling the elongation state of oligorotaxanes in the gas phase through appropriate inputs and underline its conformational reversibility properties. Novel aspect Stimuli-induced reversible conformational rearrangements of innovative AMMs studied by IM-MS and molecular dynamics in the gas phase. [less ▲]

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See detailNarration et argumentation. Retour sur l’analyse du discours en sciences sociales
Lttr13; Badir, Sémir ULg; Polis, Stéphane ULg et al

Conference (2017, May 31)

En 1979 a paru un ouvrage dirigé par A.J. Greimas et É. Landowski, intitulé « Introduction à l’analyse du discours en sciences sociales ». L’ouvrage n’a pas connu le succès de son contemporain, publié la ... [more ▼]

En 1979 a paru un ouvrage dirigé par A.J. Greimas et É. Landowski, intitulé « Introduction à l’analyse du discours en sciences sociales ». L’ouvrage n’a pas connu le succès de son contemporain, publié la même année, le célèbre « Sémiotique. Dictionnaire de la théorie du langage ». On souhaite dans cette communication proposer un bilan critique, en comparant les postulats de la méthode sémiotique avec ceux d’autres modèles d’analyse, et soulever quelques questions théoriques relatives aux types de discours. L’ouvrage de Greimas et Landowski s’inscrit dans le projet général d’extension du modèle narratif d’analyse textuelle. Selon ce projet, le modèle initialement développé en vue de l’analyse des contes et des mythes peut être appliqué à différents types de discours en envisageant dans leur variété, suivant « un degré croissant de complexité et d’abstraction », les « formes de production sociale du sens » (Greimas & Landowski, p. 5, passim). Le modèle étend ainsi la notion de récit à tout type de discours, à toute forme textuelle, ainsi que le confirme le « Dictionnaire ». Cette extension généralisée prend appui sur une typologie des discours qu’illustrent des analyses particulières publiés dans les années 1980 (Bastide 1981 ; Bastide & Fabbri éds 1985 ; Landowski 1986). Déjà en 1966, dans « Sémantique structurale », Greimas prévoyait une typologie de quatre types de « micro-univers sémantiques » (p. 128) où s’opposent, en fonction de deux critères, les univers dits « idéologiques » (dont ressortit le conte populaire) et les univers « scientifiques ». On peut considérer que la proposition de recherche qu’ont dirigée Greimas et Landowski est ainsi située au point le plus éloigné d’élaboration et d’application initiale du modèle suivi et qu’elle constitue par conséquent une expérience-limite pour le modèle narratif. Ce faisant, l’approche sémiotique prenait le risque d’être confrontée à d’autres modèles d’analyse, tels qu’ils se sont élaborés dans des cadres théoriques issus de la rhétorique (réactualisée dans les années 1950 par Chaïm Perelman et son école), de la pragmatique (cf. Parret 1983 & 1987), de la sociologie de la connaissance (à partir de l’ouvrage fondateur de Berger & Luckmann 1966) ou comme ils relèvent d’autres courants théoriques en sciences du langage (notamment, en France, l’analyse du discours d’inspiration althussérienne). Pour l’analyse des discours en sciences sociales, ces modèles offrent deux avantages sur celui de la sémiotique : d’une part, il semble que les postulats théoriques sur lesquels ils sont construits s’accordent plus directement au type que ces discours constituent ; d’autre part, ils peuvent désormais compter sur une solide tradition d’études permettant de pérenniser les résultats. La congruence apparente entre modèles d’analyse et types de discours, malgré l’extension d’applicabilité à laquelle ces modèles peuvent prétendre, soulève des questions relatives à la légitimité d’une typologie des discours. Celle-ci peut-elle se mettre au-dessus des postulats théoriques qui forgent les appariements entre modèle d’analyse et type de discours ? Si ce n’est le cas, quels enjeux la question typologique permet-elle de soulever ? Outre celle de Greimas évoquée plus haut, les tentatives qui ont été proposées à ce sujet (notamment van Dijk 1972 & 1975 ; Adam 1999 & 2011 ; Bronckart 1997 ; Maingueneau 2007), nous permettront d’en donner au moins une idée. [less ▲]

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See detailDo nonbelieved memories typically refer to childhood memories?
Vanootighem, Valentine ULg; Brédart, Serge ULg

Conference (2017, May 31)

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See detailStranger harassment: perception, tolerance and the influence of gender identities and gender stereotypes
Goblet, Margot ULg; Glowacz, Fabienne ULg

Poster (2017, May 31)

Stranger harassment is defined as gender based harassment in public spaces. Despite its frequency and its detrimental consequences, research has barely begun to address this phenomenon. Stranger ... [more ▼]

Stranger harassment is defined as gender based harassment in public spaces. Despite its frequency and its detrimental consequences, research has barely begun to address this phenomenon. Stranger harassment is in the eye of the beholder. Gender differences and contextual factors are decisive for its interpretation (Fairchild, 2010; Rotundo, Nguyen and Sackett, 2001). The aim of this study is to estimate contextual factors of stranger harassment and more precisely to examine the influence of gender identities and gender roles on perception and tolerance of stranger harassment within a population of young women and men aged 18-35. Two methods of data collection are used, a paper questionnaire and an on-line questionnaire. The sample should include more than 600 subjects. Participants are surveyed regarding their global life satisfaction (Satisfaction With Life Scale, Diener et al., 1985), personal experiences of stranger harassment (Sexual Experience Questionnaire, Fairchild, 2010) and the context of occurrence and the consequences of those experiences on several aspects of their life. Acceptation and tolerance of sexual harassment (Sexual Harassment Attitude Scale, Mazer et Percival, 1989), identification to gender roles (short French version of Bem Sex-Roles Inventory, Fontayne et al., 2000) and experiences of sexual victimization are also addressed. Results will provide us an overview of stranger harassment and its occurrence. Some risk factors may be identified, as experiences of sexual victimization that may influence tolerance of stranger harassment. Furthermore, the influence of gender roles and gender identities may be crucial for the understanding of stranger harassment as a gender based behavior [less ▲]

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See detailNON-PATHOLOGICAL AGING OF THE EXECUTIVE FUNCTIONS: INFLUENCE OF THE VAL108/158MET NUCLEOTIDE POLYMORPHISM OF THE COMT GENE
Gilsoul, Jessica ULg; Manard, Marine ULg; Collette, Fabienne ULg

Conference (2017, May 31)

Introduction. According to the Dual-State Theory of prefrontal cortex dopamine, Val/Val polymorphism of the COMT gene would favor better flexibility abilities, whereas Met/Met carriers would favor better ... [more ▼]

Introduction. According to the Dual-State Theory of prefrontal cortex dopamine, Val/Val polymorphism of the COMT gene would favor better flexibility abilities, whereas Met/Met carriers would favor better stability abilities. These genotypic effects should be magnified in older people, as a decrease in cognitive resources increases the influence of individual genetic differences on cognitive performance. Therefore, the aim of the study is to investigate the influence of the COMT Val108/158Met nucleotide polymorphism on executive functions in normal aging. Method. We assessed the executive processes of inhibition, shifting, and updating thanks to many different tasks in groups of young (n = 55) and aged participants (n = 45) carrying one of the three polymorphisms of the COMT gene (Val/Val, Val/Met, Met/Met). T-tests between our two groups (Young versus Aged) but also a 6 (Group: Young-Met/Met, Young-Val/Met, Young-Val/Val, Old-Met/Met, Old-Val/Met, and Old-Val/Val) X 3 (Executive functioning: Inhibition, Shifting, and Updating) repeated measure ANOVA with Executive functioning as within-subject factor (p < .05) were carried out. Results. Young and old participants significantly differed on the three executive functions. The comparison of genotypic groups showed no significant differences in young or older participants respectively. Interestingly, the Old-Val/Val group showed a lower performance than the young one on inhibition tasks. Discussion. As expected, we found an age effect on all the executive functions. The significant difference between the Young-Val/Val and the Old-Val/Val groups on inhibition suggests an age-related decrease in abilities requiring a stability component in individuals possessing a less favoring genotype for this component. [less ▲]

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See detailLe "Good Lives Model", un modèle novateur d'intervention au service des besoins de l'usager: Expérience d'adaptation au sein de l'hôpital psychiatrique sécurisé "Les Marronniers" à Tournai
Henrard, Noémie ULg; Devillers, Bérengère ULg; Oswald, Pierre et al

Conference (2017, May 31)

L’Hôpital Psychiatrique Sécurisé (H.P.S.) « Les Marronniers » de Tournai fut la première équipe francophone, en collaboration avec le Groupe Antigone, à avoir adapté le Good Lives Model (GLM) à une ... [more ▼]

L’Hôpital Psychiatrique Sécurisé (H.P.S.) « Les Marronniers » de Tournai fut la première équipe francophone, en collaboration avec le Groupe Antigone, à avoir adapté le Good Lives Model (GLM) à une population psychiatrique (GLM – FM). Le cadre théorique et méthodologique du G.L.M – FM offre la possibilité de dépasser le paradigme du risque/rechute en proposant des principes et outils qui guident l’intervention tout en tenant compte du rôle des symptômes psychiatriques/infraction et des besoins humains fondamentaux de l’usager. Le G.L.M – FM implique d’élaborer avec l’usager un « Good Live Plan », plan de vie visant à satisfaire les besoins humains fondamentaux et à accéder à une meilleure qualité de vie. Le G.L.M- FM intègre à la fois les risques et les perspectives de réadaptation, et ce, dans une approche globale, intégrée et cohérente. Objectifs : - Présenter les fondements théoriques et les principes cliniques de base qui guident le Good Lives Model - Forensic Mental Health ; - Présenter différents outils cliniques (général et spécifique) permettant l’opérationnalisation du GLM-FM ; - Développer l’expérimentation et l’adaptation du G.L.M. réalisé au sein de l’H.P.S. de Tournai au travers des projets UET et Epicéas. Méthodes d’apprentissage : - Expérimentation par les participants d’un des champs de l’outil de l’Inventaire des Souhaits et Préoccupations Personnels (ISPP) ; - Articulation des principes théoriques et cliniques ; [less ▲]

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See detailFemmes auteures d’infraction à caractère sexuel en guidance sous contrainte judiciaire : entre représentations et réalités ?
Glowacz, Fabienne ULg; Lagneaux, Julien; MALEMPRE, Marc et al

Poster (2017, May 31)

La délinquance a été le plus souvent conjuguée au masculin alors que la violence des femmes est restée longtemps ignorée. Il en est de même pour la délinquance sexuelle agie par les femmes qui est étudiée ... [more ▼]

La délinquance a été le plus souvent conjuguée au masculin alors que la violence des femmes est restée longtemps ignorée. Il en est de même pour la délinquance sexuelle agie par les femmes qui est étudiée depuis peu et est reconnue tout en étant encore méconnue. Notre étude porte sur l’analyse de 23 dossiers émanant de 4 centres de santé mentale spécialisés en Belgique qui ont notamment pour mission de dresser des avis motivés à la demande d’autorité mandante dans le cadre d’un sursis probatoire, d’une libération probatoire ou définitive. L’analyse de contenu des dossiers a permis d’identifier les caractéristiques psychologique, sociale, sexuelle et criminologique des sujets ainsi que la nature des infractions commises et le profil de victimes. Dans la lignée des travaux en matière de délinquance non sexuelle, nous avons repris plusieurs questions dont celles du statut de la femme en tant que auteure et co-auteure, de la présence de troubles psychopathologiques, de l’usage de violences physiques, des antécédents judiciaires ainsi que des dynamiques familiales dans lesquelles elles ont évolué. Plus spécifiquement à la délinquance sexuelle, la sexualité et le rapport aux victimes et les victimisations antérieures ont été analysées pour compléter le portrait du fonctionnement de ces femmes. Les résultats de cette étude ont été confrontés aux représentations des travailleurs de ces centres recueillis à partir de Focus group. [less ▲]

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See detailLes limites de l’administration de la PCL - R à une population de sujets schizophrènes dans le contexte médico-légal
Englebert, Jérôme ULg; Matteucci, Marie; De Page, Louis et al

Poster (2017, May 31)

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See detailLogical tools for descriptive psychology. Set theory and foundational mereology
Leclercq, Bruno ULg

Conference (2017, May 30)

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See detailObservation and simulation of ethane at 22 FTIR sites
Mahieu, Emmanuel ULg; Franco, Bruno ULg; Pozzer, Andrea et al

Conference (2017, May 30)

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See detailImpact of circulation changes on the long-term trend of stratospheric hydrogen fluoride at five NDACC stations
Prignon, Maxime ULg; Bernath, P.F.; Blumenstock, T. et al

Poster (2017, May 29)

Hydrogen fluoride is mainly produced by the photolysis of anthropogenic source gases such as the chlorofluorocarbons (CFC), the hydrochlorofluorocarbons (HCFC) and the hydrofluorocarbons (HFC). These ... [more ▼]

Hydrogen fluoride is mainly produced by the photolysis of anthropogenic source gases such as the chlorofluorocarbons (CFC), the hydrochlorofluorocarbons (HCFC) and the hydrofluorocarbons (HFC). These families of species are known for contributing to ozone depletion and/or to the greenhouse effect. It is thus essential to regulate and monitor their emissions. Despite the fact that the Montreal protocol (1987) has succeeded to reduce and then suppress the CFC emissions, HF is still increasing in the stratosphere because of ongoing emissions of the HCFC and HFC substitution products. In the framework of the recent studies demonstrating the influence of stratospheric circulation changes on the trend of long-lived tracers (e.g. hydrogen chlorine), we decided to investigate the impact of these circulation changes on HF. To achieve this objective, the rates of changes over time of HF total/partial columns at various latitudes of the globe will be determined and critically discussed. Fourier Transform Infrared data produced at five NDACC sites (Kiruna – 68°N, Jungfraujoch – 46°N, Izana – 28°N, Lauder 45°S and Arrival-heights – 78°S) and satellite data (HALOE and ACE) will be used for this study. This preliminary selection of ground-based stations allows to cover both hemispheres and our period of investigation (last two decades). Finally, in order to support our data interpretation, two SLIMCAT simulations (standard and fixed dynamics) will also be included. [less ▲]

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See detailActualités des traitements conservateurs des tendinopathies
Kaux, Jean-François ULg

Conference (2017, May 28)

Les connaissances et la prise en charge des tendinopathies ont beaucoup évolué depuis ces dernières années. En effet, se substituant désormais à l’ancienne appellation « tendinite », les tendinopathies ... [more ▼]

Les connaissances et la prise en charge des tendinopathies ont beaucoup évolué depuis ces dernières années. En effet, se substituant désormais à l’ancienne appellation « tendinite », les tendinopathies sont majoritairement décrites selon le modèle de continuum établi par Cook et Purdam. La compréhension de la physiopathologie de ces lésions a permis l’émergence de nombreux traitements dans le but d’obtenir une récupération optimale et une limitation des récidives. L’objectif de cet article est de faire une revue de l’actualité thérapeutique des tendinopathies. [less ▲]

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See detailPhysiopathologie des tendinopathies
Kaux, Jean-François ULg

Conference (2017, May 28)

Le tendon, tissu conjonctif fibreux, mécaniquement responsable de la transmission de la force des muscles vers les os, constitue une entitédynamique qui, en fonction des contraintes, se restructure en ... [more ▼]

Le tendon, tissu conjonctif fibreux, mécaniquement responsable de la transmission de la force des muscles vers les os, constitue une entitédynamique qui, en fonction des contraintes, se restructure en permanence et, ce, grâce à diverses modifications métaboliques et mécaniques. Cetterevue décrit l’histologie, la vascularisation et l’innervation du tendon sain. De plus, la biomécanique et les réponses physiologiques tendineuses,ainsi que la physiopathologie de la tendinopathie y sont abordées. [less ▲]

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See detailMultifunctional poly(ionic liquid)s: from synthesis to applications in energy and environment
Detrembleur, Christophe ULg; Patil, Nagaraj ULg; Debuigne, Antoine ULg et al

Conference (2017, May 24)

Poly(ionic liquid)s (PILs) are a subclass of polyelectrolytes that gained an enabling role in many fields of polymer chemistry and material science. PILs combine the unique properties of ionic liquids ... [more ▼]

Poly(ionic liquid)s (PILs) are a subclass of polyelectrolytes that gained an enabling role in many fields of polymer chemistry and material science. PILs combine the unique properties of ionic liquids with the flexibility and properties of macromolecules, and provide novel attractive functions. Recently, the precision design of novel PILs by controlled/living polymerization (CLP) techniques was intensively searched for developing emerging applications. This talk will first discuss recent routes for the precision synthesis of all vinyl-imidazolium based (co)polymers in water or in organic media under non-demanding experimental conditions. We will then describe the preparation of innovative redox and surface active PILs, and show the potential of these PILs in battery applications and for multifunctional coatings. More specifically, we will show how macromolecular engineering can be exploited for designing innovative polymer cathodes for ultra-high performance Li storage with unprecedented performances (high capacities and ultra-long life-span over more than 3000 cycles at an extreme current-rate). This innovative and effective molecular design for polymer cathodes opens up new horizons in developing an economical and environmentally benign platform for large-scalable fabrication of high performance batteries. [less ▲]

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See detailPolyphosphoesters: new trends in synthesis and drug delivery applications
Jérôme, Christine ULg

Conference (2017, May 24)

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See detailCe que devait encore révéler le site de la Schola del Traiano à Ostia Antica
Morard, Thomas ULg

Conference (2017, May 24)

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See detailPhenotyping of Brassica napus L. plantlets affected during in vitro growth by the presence of epoxiconazole.
Durenne, Bastien ULg; Blondel, Alodie; Ducat, Nathalie et al

in 7th International Symposium on Brassicas Abstract Book (2017, May 24)

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See detailTh17 cells impact on xenogeneic graft-versus-host disease
Delens, Loïc ULg; SERVAIS, Sophie ULg; Ehx, Grégory ULg et al

Poster (2017, May 24)

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See detailTime, preference and intensity: A contrastive study of rather (than) and eerder (dan)
Ghesquière, Lobke; Brems, Lieselotte ULg

Conference (2017, May 24)

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See detailAn anticancer molecule stemming from a plant root produced in a bioreactor
Vassaux, Antoine; Tarayre, Cédric ULg; Delvigne, Frank ULg et al

Poster (2017, May 24)

Secondary metabolites produced by plants or their symbionts have already shown specific properties: anticancer, anti-inflammatory, antibacterial, antifungal effects, etc. Astin C is a non-ribosomal ... [more ▼]

Secondary metabolites produced by plants or their symbionts have already shown specific properties: anticancer, anti-inflammatory, antibacterial, antifungal effects, etc. Astin C is a non-ribosomal peptide (secondary metabolite) produced by the fungus Villosirosea asteris, endosymbiont of the medicinal plant Aster tataricus, which has shown an interesting anticancer activity. The current challenge is the production of the molecule on a large scale and in higher quantities, either from the original fungus through fermentation technologies, or by a heterologous yeast strain having integrated the genes involved in the astin C biosynthesis pathway. The purpose of this workshop is to highlight the implementation possibilities of a strain producing a metabolite of interest. [less ▲]

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See detailÉdition et étude de Gerard du Frattre, compilation épique du XVIe siècle
Lambert, Adélaïde ULg

Poster (2017, May 23)

Présentation du projet de thèse de doctorat.

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See detailA surprising and dramatic neuroendocrine-immune phenotype of mice deficient in Growth Hormone-Releasing Hormone (GHRH)
Farhat, Khalil; Bodart, Gwennaëlle ULg; RENARD, Jeanne de Chantal ULg et al

Poster (2017, May 23)

In the framework of close interactions between the immune and neuroendocrine systems, Growth Hormone (GH) has been proposed to exert significant effects on the immune system, but there is not yet a ... [more ▼]

In the framework of close interactions between the immune and neuroendocrine systems, Growth Hormone (GH) has been proposed to exert significant effects on the immune system, but there is not yet a consensus about GH immunomodulatory properties. These studies investigated the immune and anti-infectious response of dwarf Ghrh-/- mice presenting a severe deficiency of the GHRH/GH/IGF-1 axis. In basal conditions, thymic parameters and T-cell responses of Ghrh-/- mice were not severely affected but a constant B-cell lymphopaenia was observed. Thus, we investigated vaccine and anti-infectious responses of Ghrh-/- mice toward Streptococcus pneumonia, a B-dependent pathogen, Ghrh-/- mice were unable to trigger production of specific IgM and IgG against serotype 1 pneumococcal polysaccharide (PPS) after vaccination with either native PPS (Pnx23) or protein-PPS conjugate (Prev-13) vaccines. These vaccines both include the serotype 1 (our S.pneumoniae strain) and provide an effective protection in mice. A short GH supplementation to Ghrh-/- mice (1 daily injection of 1 mg/kg GH for 4 weeks) restored IgM and IgG response to Pnx23 vaccine but not to Prev-13. This suggests that GH could exert distinct impacts upon spenic areas. Furthermore, after intranasal instillation of a non-lethal dose (defined by the full clearance by WT C57BL/6 mice after 24h) of serotype 1 S.pneumoniae, Ghrh-/- mice exhibited a dramatic susceptibility. This was proved by a marked time-dependent increase in pulmonary bacterial, a septicemia already 24h after infection and a survival limit of 72h. We also observed a dramatic decrease in lung B- and T-cell populations and an increase in proportion of inflammatory macrophages. By contrast, wild-type and heterozygote mice completely cleared S.pneumoniae infection after 24h. In conclusion, our data show without ambiguity that the somatotrope GHRH/GH/IGF-1 axis plays an important and unsuspected role in defense against S.Pneumoniae. [less ▲]

Detailed reference viewed: 19 (2 ULg)
See detailPrecision synthesis and characterization of novel functional polymers
Scholten, Philip ULg; Debuigne, Antoine ULg; Demarteau, Jérémy ULg et al

Poster (2017, May 23)

Among controlled radical polymerisation techniques, cobalt-mediated radical polymerisation (CMRP) has proven to be a valuable alternative in polymerising unreactive and unconjugated monomers of many ... [more ▼]

Among controlled radical polymerisation techniques, cobalt-mediated radical polymerisation (CMRP) has proven to be a valuable alternative in polymerising unreactive and unconjugated monomers of many different monomer classes under mild conditions, including α-olefins. In a reversible deactivation mechanism, a cobalt complex reversibly traps the active growing chains and converts them into dormant species, avoiding side reactions and allowing for a controlled polymerisation. A fine control over the architecture is possible and allows to synthesise a large diversity of unprecedented block and alternating copolymers. Furthermore, functionalisation of the α- and ω-chain ends is now also possible. In this poster, the polymerization of different vinyl monomers using CMRP has been investigated to design highly functional materials under mild experimental conditions. The copolymerisation behaviour of these novel monomers was examined, and the structure and thermal properties of the new copolymers were investigated. [less ▲]

Detailed reference viewed: 15 (2 ULg)
See detailStudy of volatile organic compounds active against barley pathogens
De Clerck, Caroline ULg; Kaddes, Amine ULg; Fiers, Marie et al

Conference (2017, May 23)

Detailed reference viewed: 24 (2 ULg)
Peer Reviewed
See detailEssential oil of Tunisian plant: biopesticide applied in agricultural system
Ben Kaab, Sofiène ULg; ksouri, riadh; Jijakli, Haissam ULg

Conference (2017, May 23)

The use of plant-derived products in postharvest disease management may be a valid alternative to conventional chemical treatments (Pane et al., 2016). Unfavorable environmental conditions (such as salt ... [more ▼]

The use of plant-derived products in postharvest disease management may be a valid alternative to conventional chemical treatments (Pane et al., 2016). Unfavorable environmental conditions (such as salt and drought) increase production and accumulation of reactive oxygen species (ROS). Consequently, Tunisian plants have developed adaptive responses including the synthesis of specific bioactive molecules used for medical and nutritional purposes (Ksouri et al., 2012). In that context, the main objective of the present study was the identification of essential oils from Tunisian plants against the important plant pathogens, particularly in Europe. The study began with the selection of endemic medicinal plant suspected to present antimicrobial properties. The essential oil was extracted by hydrodistillation using a Clevenger type apparatus (with a yield of 1.2%). The chemical composition of the essential oil obtained by hydro-distillation from the aerial parts was analyzed by GC/MS. Therefore, antifungal activity was evaluated against Fusarium culmorum, Fusarium oxysporum and Penicillium italicum, using ELISA microplates with a blocked randomized design, as described previously (Kouassi et al., 2012). In addition, the essential oil was then tested for their herbicidal activities in pre-emergence and post-emergence assays against three weeds species. The chromatographic analysis showed a complex mixture where twenty compounds were identified accounting for 98.75 % of the total oil. Monoterpenes was represented by 71.73 %. The dominant monoterpenes are α Pinene (7.09%), 1,8-Cineole (54.6%) and Camphor (12.27%). Essential oil reduced significantly spores germination in a dose-dependent manner. Their fungistatic activity reached 100% at 0.6% against Fusarium oxysporum . In the dose response bioassay, the essential oil reduced seed germination rate of Phalaris minor, Sylibum marianum and Trifolium incanatum. Seedling growth was measured by shoot and root lengths at day 7. At 0.5%, essential oil reduced 100% seed germination. Post-emergence bioassays consisted in spraying essential oil at 3 concentrations (0.75, 2 and 3.4 %) at 2 leaves stage of three weeds species. Pelargonic acid was used as commercial positive control at 3.4%. At 0.75% and 2%, the essential oil do not show any sign of injury. However, only at 3.4 %, the spraying of essential oil showed visible injury ranging from wilting (after 1 day) and chlorosis (after 3 day) on Trifolium incanatum and Phalaris minor. After formulation, to enhance the distribution, the coverage and the penetration of the active molecules, the essential oil presented a high herbicidal activity. In conclusion, this work allowed to open new perspectives on the application of Tunisian essential oil as Novel biocontrol strategies against damageable plant pathogens and weeds. [less ▲]

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See detailStudy of VOCs in the interaction between Banana and Foc TR4
Berhal, Chadi ULg; De Clerck, Caroline ULg; LEVICEK, Carolina et al

Poster (2017, May 23)

Banana fruit (Musa sp.) ranks fourth in term of worldwide production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish ... [more ▼]

Banana fruit (Musa sp.) ranks fourth in term of worldwide production, and has economical and nutritional key values. The popular and most dominant variety of the dessert banana group is the Cavendish variety. Nowadays, the Cavendish is endangered by the newly emergent race of the Panama disease, caused by the fungal pathogen Fusarium oxysporum f.sp. cubense TR4 (Foc TR4). Despite the importance of the Volatile Organic Compounds (VOCs), which are secondary metabolites with a high vapour pressure, in their utility in the plant protection processes, they were never documented as a way to manage this disease on Cavendish. Thus, the aim of this PhD thesis is to study the VOCs in the specific interaction Cavendish/Foc TR4, as a way to manage this threat. Based on the work previously done with other plants at Gembloux Agro-Bio Tech/University of Liège/Belgium, a protocol was optimized for the extraction of the banana plant’s VOCs. And in parallel, models of in-vitro and in-vivo inoculations are under development, in order to distinguish the root zone from the upper part of the plant in the study. The results of the first analysis showed that the majority of the Cavendish VOCs belongs to the terpenes group, as well as ketones and an organic ester. The identified key VOCs of the interaction will be subject to toxicity tests, in order to determine their effect on the development of the plant and the pathogen. The banana plant is a staple food for more than 400 Million people in the world, while this disease persists as a major threat for its production, and this original study could contribute to the fight against this threatening disease. [less ▲]

Detailed reference viewed: 20 (2 ULg)
See detailDesign of polyphosphoester-based drug delivery systems by efficient thiol-ene reaction
Riva, Raphaël ULg; Vanslambrouck, Stéphanie; Ergül, Zeynep ULg et al

Poster (2017, May 23)

Thanks to their biocompatibility, biodegradability and their structure similar to natural biomacromolecules, polyphosphoesters (PPE) are appealing polymers for biomedical applications. In contrast to ... [more ▼]

Thanks to their biocompatibility, biodegradability and their structure similar to natural biomacromolecules, polyphosphoesters (PPE) are appealing polymers for biomedical applications. In contrast to polyesters, PPE properties and functionality are easily tuned via the chemical nature of the lateral chains. To enhance the drug loading capacity of PPE-based micelles used as carriers for the delivery of poorly soluble drugs, an efficient strategy to increase the lipophilicity of the PPE block of polyethylene oxide (PEO)-b-PPE amphiphilic copolymers has been investigated. A PEO-b-PPE copolymer bearing pendant vinyl groups along the PPE block was synthesized and then modified by thiol-ene click reaction with thiols bearing either a long linear alkyl chain (dodecyl) or a tocopherol moiety. Ketoconazole was used as model for hydrophobic drugs. Comparison of the loading contents and release profiles with PEO-b-PPE bearing shorter pendant groups is presented evidencing the key role of the structure of the pendant group on the PPE backbone. Finally, the low cytotoxicity of these novel PEO-b-PPE copolymers was also demonstrated. The tocopherol derivative was evidenced as particularly promising for drug delivery systems. [less ▲]

Detailed reference viewed: 21 (3 ULg)
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See detailCorrection de questions à réponses ouvertes: le logiciel SQORE
Crahay, Vinciane ULg; Bonnet, Pierre ULg

Conference (2017, May 23)

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See detailDEVELOPPEMENT D’UN MODELE DE SYSTEME DE CLIMATISATION AUTOMOBILE MULTI-EVAPORATEURS
Gillet, Thomas ULg; Gendebien, Samuel ULg; Lemort, Vincent ULg et al

Conference (2017, May 22)

La modélisation numérique d’un climatiseur d’automobile multi-évaporateurs, composé de deux évaporateurs et d’un refroidisseur d’eau, a été réalisée à l’aide du logiciel LMS Imagine.Lab Amesim® 1D avec le ... [more ▼]

La modélisation numérique d’un climatiseur d’automobile multi-évaporateurs, composé de deux évaporateurs et d’un refroidisseur d’eau, a été réalisée à l’aide du logiciel LMS Imagine.Lab Amesim® 1D avec le fluide frigorigène R-134a. Un banc d’essai capable de reproduire les conditions extérieures d’un climatiseur automobile a été conçu afin de tester l’architecture de cette machine multi-évaporateurs avec le fluide frigorigène R-1234yf. Les bilans thermiques des premiers résultats expérimentaux sont analysés et présentés. Afin d’illustrer la complexité du contrôle d’une telle architecture en régime dynamique, l’activation d’une vanne électromagnétique dans la boucle batterie du banc d’essais est présentée. Enfin, une perturbation de type échelon a été générée dans le modèle numérique afin de vérifier si les phénomènes transitoires observés expérimentalement sont reproduits. [less ▲]

Detailed reference viewed: 70 (6 ULg)
See detailProtein encapsulation into nanostructured CaCO3 microparticles templated by PEO-b-polyphosphoester using a supercritical CO2 process
Ergül, Zeynep ULg; Debuigne, Antoine ULg; Calvignac, Brice et al

Poster (2017, May 22)

The use of calcium carbonate microparticles is becoming more and more attractive in biomedical applications as proteins carriers for their controlled delivery in the body. We investigate the protein ... [more ▼]

The use of calcium carbonate microparticles is becoming more and more attractive in biomedical applications as proteins carriers for their controlled delivery in the body. We investigate the protein encapsulation by in situ precipitation of CaCO3 particles prepared by a process based on supercritical CO2 and using a new type of degradable well-defined double hydrophilic block copolymer composed of poly(ethylene oxide) and polyphosphoester block with an affinity for calcium like poly(phosphotriester)s bearing pendent carboxylic acids on each repeating monomer unit which evidenced an efficient structure for templating the formation of CaCO3 leading to unprecedented small-sized particles. Lysozyme was chosen as a model for therapeutic protein for its availability and ease of detection. It was found that by this green process, loading into the CaCO3 microparticles with a diameter about 2 μm can be obtained as determined by scanning electron microscopy. A protein loading up to 6.5% active lysozyme was measured by a specific bioassay (Micrococcus lysodeikticus). By encapsulating fluorescent-labelled lysozyme (lysozyme-FITC), the confocal microscopy images confirmed its encapsulation and suggested a core–shell distribution of lysozyme into CaCO3. [less ▲]

Detailed reference viewed: 20 (1 ULg)
See detailLaccase detoxification of lignocellulose hydrolysate
Cornet, Iris; Soti, Valentin; Richel, Aurore ULg et al

Poster (2017, May 22)

Detailed reference viewed: 19 (0 ULg)
See detailFunctional emulsion-templated porous polymers by macromolecular surfactant anchoring strategies
Mathieu, Kevin ULg; Jérôme, Christine ULg; Debuigne, Antoine ULg

Poster (2017, May 22)

Macroporous polymer monoliths with interconnected structures have attracted considerable interest in the fields of supported catalysis, chromatography, water purification, etc. A popular and ... [more ▼]

Macroporous polymer monoliths with interconnected structures have attracted considerable interest in the fields of supported catalysis, chromatography, water purification, etc. A popular and straightforward synthesis approach for such open-cell polymers is based on the polymerization of high internal phase emulsion (HIPE). Advanced functional polyHIPEs were also produced via different post-modification strategies but the latter often consists in tedious multi-step processes. This communication aims at reporting an efficient one-pot macromolecular surfactant-assisted method for the simultaneous synthesis and chemical functionalization of macroporous polyHIPEs. Briefly, amphiphilic block copolymers prepared by nitroxide-mediated radical polymerization (NMP) or reversible addition-fragmentation chain transfer (RAFT) were used as HIPE stabilizers and grafted at the surface of the walls of polyHIPE during the polymerization process. The impact of the controlled radical polymerization mechanism on the porous structure, openness and functionalization of the monoliths will be discussed. This strategy was also implemented with alkyne-terminated copolymers in order to decorate the surface of the polyHIPE’s cavities with “clickable” moieties which broadens the scope of functional macroporous polymers. [less ▲]

Detailed reference viewed: 20 (3 ULg)
See detailSynthesis of cross-linked P(HEMA) particles in supercritical carbon dioxide for protein delivery
Parilti, Rahmet ULg; Howdle, Steven M.; Jérôme, Christine ULg

Poster (2017, May 22)

This project aims to develop a novel one-pot strategy to obtain well-defined cross-linked particles able to carry peptides/proteins in their core, as along with targeting and/or imaging agents on their ... [more ▼]

This project aims to develop a novel one-pot strategy to obtain well-defined cross-linked particles able to carry peptides/proteins in their core, as along with targeting and/or imaging agents on their surface. In addition to this objective, polymerisations will be carried out in supercritical carbon dioxide (scCO2), which confers environmentally benign features to the process. Here, we investigate the feasibility of free radical dispersion polymerizations of 2-hydroxyethyl methacrylate (HEMA) in scCO2. In order to ensure the successful dispersion in scCO2 novel diblock CO2-philic surfactants are employed. These diblock surfactants are formed from two different segments, a CO2-phobic block which has an affinity to the growing particles and a second CO2-philic block that ensures surfactant solubility. [less ▲]

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See detailPerineuronal nets and song learning-related neuroplasticity in the songbird brain
Cornez, Gilles ULg; Jonckers, Elisabeth; Schevchouk, Olesya et al

Conference (2017, May 22)

Perineuronal nets (PNN) are aggregations of extracellular matrix components surrounding the soma of some neurons, mainly GABAergic interneurons expressing the calcium binding protein parvalbumin (PV+). In ... [more ▼]

Perineuronal nets (PNN) are aggregations of extracellular matrix components surrounding the soma of some neurons, mainly GABAergic interneurons expressing the calcium binding protein parvalbumin (PV+). In mammals, the development of PNN limits synaptogenesis around PV+ neurons and PNN have been validated as a marker characterizing the end of critical periods for visual learning. In songbirds, song learning is limited to critical periods during ontogeny in close-ended learners such as zebra finches and to specific phases of the annual cycle in open-ended learners such as canaries that are able to modify their song seasonally. Sensitive periods for song learning are associated with neuroplasticity including morphological changes due to neurogenesis and synaptic reorganization in the song control nuclei during development and adult seasonal song modifications. The hormonal control of developmental and seasonal neuroplasticity is well documented in songbirds but little is known about the possible regulation of sensitive periods for vocal learning by PNN. First, to explore the expression of PNN throughout the development, we used zebra finches brains collected at different key ages in the song learning process (10, 20, 30, 40, 50, 60, 90, 120 days post-hatch, dph) and we quantified PNN expression and their colocalization around PV+ interneurons. The number of PNN and the % of PNN around PV+ interneurons increased progressively during developmental song learning in 3 of the main song control nuclei (HVC, RA and Area X). Moreover, we confirmed that females that never sing have fewer PNN than males in HVC and RA, two song nuclei involved in song production, at all ages after the peak in PNN numbers seen in males between 50 and 90 dph. Secondly we used adult male and female canaries (in 2 different experiments) treated with a subcutaneous implant filled with testosterone or left empty in control subjects to mimic what happens in the spring when the seasonal modification of the song ends and the song crystallizes. Testosterone significantly increased the number of PNN in the main song control nuclei in both sexes. Together these data suggest that increased expression of PNN in the songbird brain might limit neuroplasticity at the end of developmental and seasonal vocal learning [less ▲]

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See detailPERFORMANCES D’UNE MINI POMPE À CHALEUR RÉVERSIBLE FONCTIONNANT SUR L’AIR EXTRAIT : ÉTUDE NUMERIQUE ET EXPERIMENTALE
Ransy, Frédéric ULg; Gendebien, Samuel ULg; Lemort, Vincent ULg

Poster (2017, May 22)

La majeure partie de la consommation d’énergie des immeubles à appartement dits « basse énergie » est liée à la production d’eau chaude sanitaire et aux pertes par ventilation. De plus, ces immeubles sont ... [more ▼]

La majeure partie de la consommation d’énergie des immeubles à appartement dits « basse énergie » est liée à la production d’eau chaude sanitaire et aux pertes par ventilation. De plus, ces immeubles sont soumis à un risque de surchauffe non négligeable en été. Afin de minimiser leur consommation d’énergie, les systèmes HVAC utilisés dans ces bâtiments se doivent d’être performants et multitâches. Dans cette optique, l’Université de Liège teste actuellement une mini-pompe à chaleur réversible sur air extrait. Cet article présente les résultats expérimentaux obtenus en laboratoire et démontre quelles sont les variables qui influencent les performances de cette machine. Un modèle polynomial est également proposé. [less ▲]

Detailed reference viewed: 15 (2 ULg)
See detailUnprecendeted fluoroalkene-based copolymers through cobalt-mediated radical polymerization
Demarteau, Jérémy ULg; Ameduri, Bruno; Ladmiral, Vincent et al

Poster (2017, May 22)

The precision design of fluorinated copolymers is challenging but also attractive for future developments in a wide range of applications involving fluoropolymers, such as advanced coatings or ... [more ▼]

The precision design of fluorinated copolymers is challenging but also attractive for future developments in a wide range of applications involving fluoropolymers, such as advanced coatings or purification membranes. In particular, controlling the radical polymerization of fluoroalkenes remains extremely difficult because of the high reactivity of these monomers due to the lack of resonance stabilizing group on their double bond. Herein, Cobalt-Mediated Radical Polymerization (CMRP) was used to efficiently control the bulk copolymerization of perfluorohexylethylene (PFHE) and vinyl acetate (VAc). Well-defined statistical poly(PFHE-stat-VAc) copolymers with different compositions (0 < FPFHE < 0.5) were obtained accordingly. In some cases, fluorinated monomer content as high as 80 % by weight were achieved. Reactivity ratios were determined (rVAc = 0.18 and rPFHE = 0) and emphasized a clear tendency for alternation. Single step approach and sequential polymerization were assessed for the synthesis of novel PFHE/VAc block copolymers. Finally, the acidic hydrolysis of the pendant ester groups of these block copolymers led to the formation of novel highly amphiphilic macromolecules bearing a PVOH hydrophilic segment and a hydrophobic PFHE-based block. [less ▲]

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See detailMerging CO2 transformation and utilization with renewable bio-resources: a step forward to a double vision of sustainable chemistry
Grignard, Bruno ULg; Poussard, Loïc; Raquez, Jean-Marie et al

Conference (2017, May 22)

Valorizing waste CO2 as a cheap, inexhaustible and renewable C1 feedstock is an early stage technology with strong innovation potential that imposes itself as a strategic driver for developing future low ... [more ▼]

Valorizing waste CO2 as a cheap, inexhaustible and renewable C1 feedstock is an early stage technology with strong innovation potential that imposes itself as a strategic driver for developing future low carbon footprints materials. Beside its use as raw chemical, the “physical” valorization of CO2 in a series of industrial cost-efficient processes will also accelerate the development of a low carbon economy and support the elaboration of a global low carbon vision scheme. The synergistic and paradigm-transforming holistic project we propose perfectly illustrates these concepts by encompassing a “cradle” to “grave” vision, i.e. from the products conception from CO2 and bio-resources to their production and processing through sustainable processes compatible with existing industrial relevant infrastructures. It focuses on the elaboration of sustainable isocyanate-free polyurethane foams with promising thermal insulation properties. By its objectives, this study also proposes an ideal alternative to the conventional synthesis of PUs and a practical answer to the challenge the PU sector is facing due to changes in the REACH regulations limiting the use of isocyanates. The success of the project relies on 3 key steps involving: i) The synthesis of bio- and CO2-sourced cyclic carbonates monomers: Due to the low reactivity of CO2 versus epoxides, addition of catalysts is necessary. To overcome this limitation, we developed a new highly-efficient bicomponent homogeneous organocatalyst that showed unexpected activity for the fast (within a few minutes) and selective addition of CO2 onto model epoxides and epoxidized vegetable oil under solvent-free and mild experimental conditions at the multiKg scale. The use of this powerful dual organocatalyst was further extended to the first organocatalytic coupling of CO2 with less reactive oxetanes to produce hydroxyl telechelic oligocarbonate entering the synthesis of CO2-sourced conventional PUs. - The synthesis of sustainable bio- and CO2- sourced isocyanates-free polyurethanes (NIPU): Sustainable NIPUs were produced by step-growth polymerization between the so-produced bio- and CO2-sourced cyclic carbonates and biosourced amino-telechelic comonomers derived from linseed fatty acids according to a process compatible with existing industrial infrastructures (extrusion). - The foaming of NIPUs: Sustainable foams with thermal insulation were produced by the supercritical CO2 assisted foaming technology. Due to its solubility in polymers, CO2 can replace conventional flammable VOCs and ozone depletion physical blowing agents as hydro- or fluorocarbons exhibiting long atmospheric life-time and/or mean global warming potential 2800 higher than CO2. By finely choosing the CO2 impregnation and the foaming conditions, low density microcellular NIPU foams with a thermal conductivity as low as 0.050 Wm-1K-1 were produced. Our study shows that CO2 is not only sequestered in the material for long-term application, but is also valorized as a blowing agent in the production of sustainable thermally insulating NIPU foams. Such low carbon footprints materials will contribute to energy conservation and savings by reducing CO2 emissions. [less ▲]

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See detailLa nature des intérêts spécifiques distingue les personnes avec et sans retard de langage.
Chiodo, Liliane ULg; Majerus, Steve ULg; Eusèbe, Sandrine et al

Poster (2017, May 20)

Detailed reference viewed: 52 (0 ULg)
See detailEvaluer la mémoire épisodique par la réalité virtuelle ?
Willems, Sylvie ULg; Meulemans, Thierry ULg

Conference (2017, May 20)

L’évaluation de la mémoire épisodique est traditionnellement menée au moyen de tâches de rappel ou de reconnaissance peu écologiques (rappel ou reconnaissance de listes de mots, d’images). Un des atouts ... [more ▼]

L’évaluation de la mémoire épisodique est traditionnellement menée au moyen de tâches de rappel ou de reconnaissance peu écologiques (rappel ou reconnaissance de listes de mots, d’images). Un des atouts essentiels de la réalité virtuelle (RV) concerne la possibilité de créer des situations proches de la vie quotidienne, tout en permettant de contrôler différentes variables. Plusieurs études illustrent cet avantage dans le domaine de l’évaluation et de la prise en charge de la mémoire spatiale ou de la mémoire prospective. Dans le domaine de la mémoire épisodique, une étude suggère que la RV permettrait de cibler des aspects spécifiques de la mémoire épisodique (p.ex., binding) et que la performance y est davantage corrélée que pour les tâches classiques avec les plaintes cognitives de personnes âgées. Jusqu’à présent, toutefois, la RV a peu été appliquée en neuropsychologie clinique. Notre projet consiste à élaborer un test clinique standardisé proche de la vie quotidienne (p.ex., avec encodage incident d’information non répétée) permettant une évaluation de différents aspects du souvenir épisodique et une évaluation à la première personne. Nous explorerons si la performance à cette tâche est corrélée avec les performances aux tests classiques de mémoire, mais également avec le fonctionnement dans la vie quotidienne. Notre projet vise ainsi à évaluer la réelle valeur ajoutée de la RV dans l’examen clinique. [less ▲]

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See detailLa reconnaissance de la maladie mentale : perspectives en troisième et en première personne
Englebert, Jérôme ULg

Conference (2017, May 20)

La distinction des perspectives en première et troisième personnes est un apport récent et décisif de la phénoménologie à la psychologie clinique et à la psychopathologie (Parnas, Sass & Zahavi, 2012). La ... [more ▼]

La distinction des perspectives en première et troisième personnes est un apport récent et décisif de la phénoménologie à la psychologie clinique et à la psychopathologie (Parnas, Sass & Zahavi, 2012). La perspective en troisième personne consiste en l’attribution, depuis une position externe, de signes cliniques repérés indépendamment du ressenti exprimé par le patient. L’exemple typique de ces signes est le délire et l’hallucination du schizophrène. Ces symptômes cristallisent les difficultés qu’éprouve le sujet à se reconnaitre affecté du trouble (l’anosognosie), et ce point est considéré par de nombreux modèles comme une cible thérapeutique prioritaire. Il est attendu que le patient adopte la position propre à son évaluateur, et externe à sa subjectivité intrinsèque. La perspective en première personne, concentre quant à elle son attention sur l’expérience subjective exprimée par le patient. Si l’on reprend le cas de la schizophrénie, ce sont la « perte de l’évidence naturelle » des choses, un « trouble du sens commun » ou un « sentiment de diminution du soi » qui sont verbalisés. Ce pas de côté de la vision omnisciente du médical, assumant une remise en cause du pouvoir de domination qu’entraine la perspective en troisième personne, se révèle être un outil psychothérapeutique pertinent. Il désacralise le problème de l’anosognosie et ouvre la voie à une perspective intersubjective, co-construite. Nous constaterons que la reconnaissance de la maladie en troisième personne, à laquelle on intègre une considération de la perspective en première personne, permet au patient d’être partie prenante du processus thérapeutique. [less ▲]

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See detailIntervenir auprès de parents en contexte de violence conjugale : des représentations à la réalisation - Pour une clinique du lien
Glowacz, Fabienne ULg

Conference (2017, May 20)

Le contexte d’insécurité induit par la violence conjugale limite la capacité du parent à prendre soin de son enfant. Sa capacité à percevoir une souffrance chez l’enfant est réduite, de même que sa ... [more ▼]

Le contexte d’insécurité induit par la violence conjugale limite la capacité du parent à prendre soin de son enfant. Sa capacité à percevoir une souffrance chez l’enfant est réduite, de même que sa capacité à protéger et à soutenir son enfant. Les conditions de vie difficile et le vécu traumatique du parent et de l’enfant induisent un stress important chez tous les membres du système familial. Intervenir auprès des parents en vue d’un soutien à leur enfant est un enjeu majeur. Dans le cadre d’un recherche-action menée avec le CVFE et le SASJ, des outils d’interventions familiales et groupales (auprès de mères) ont été développés, expérimentés et évalués. Ils ont permis au sein du système familial et/ou de la dyade mère-enfant une meilleure circularité des représentations de chacun au sein de la famille, une meilleure conscientisation par le parent de la souffrance de l’enfant, et davantage de satisfaction dans la relation parent-enfant, ces dimensions étant favorables au développement de l’enfant et au bris de la répétition intergénérationnelle. [less ▲]

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See detailL’impact de la réserve cognitive sur le fonctionnement exécutif au cours du vieillissement normal
Lesoinne, Alexia ULg; Simon, Jessica ULg; Gilsoul, Jessica ULg et al

Poster (2017, May 20)

Il existe une forte variabilité interindividuelle quant aux effets du vieillissement sur la cognition. Selon Stern (2009), les individus qui ont développé un haut niveau de réserve cognitive résisteraient ... [more ▼]

Il existe une forte variabilité interindividuelle quant aux effets du vieillissement sur la cognition. Selon Stern (2009), les individus qui ont développé un haut niveau de réserve cognitive résisteraient mieux aux effets du vieillissement. Afin de déterminer les facteurs de réserve cognitive qui expliquent le déclin exécutif dans le vieillissement, nous avons recruté 165 participants âgés de 59 à 81 ans. Ils ont effectué sept tâches évaluant le fonctionnement exécutif : des épreuves d’inhibition (Stroop et Incompatibilité de la TAP), de flexibilité (Flexibilité de la TAP, épreuve d’alternance arithmétique « plus-moins ») et de mise à jour (subtest Lettre-Chiffre de la MEM III, mise à jour de consonnes et tâche de 2-back). De plus, les participants ont complété différents questionnaires évaluant quatre facteurs de réserve cognitive (niveau d’études, parcours professionnel, activité physique et activités de loisir). Nous avons réalisé des analyses de régression linaire hiérarchique. Après avoir contrôlé les facteurs démographiques, nous avons observé que la réalisation d’au moins une activité culturelle au cours de la vie impactait positivement les capacités d’inhibition, alors que la mise à jour était impactée négativement par un trop grand nombre de loisirs domestiques. Lorsqu’on considère les loisirs actuellement pratiqués, nous observons que la réalisation d’au moins un loisir social a un impact positif sur la flexibilité alors que deux activités à caractère social sont nécessaires pour avoir un impact positif sur la mise à jour. En conclusion, nous observons un effet mitigé et différencié de la réserve cognitive sur le déclin exécutif. [less ▲]

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See detailFormer des futurs logopèdes à l’Evidence-Based Practice : défis et perspectives
Maillart, Christelle ULg; Durieux, Nancy ULg

Conference (2017, May 20)

Dans cette première intervention de l'atelier intitulé "Impacts de la recherche sur les questions de société actuelles : importance de l’evidence-based practice", nous définirons l’EBP et illustrerons la ... [more ▼]

Dans cette première intervention de l'atelier intitulé "Impacts de la recherche sur les questions de société actuelles : importance de l’evidence-based practice", nous définirons l’EBP et illustrerons la façon dont cela est enseigné à la Faculté de Psychologie, Logopédie et des Sciences de l’Education de l’Université de Liège (ULg) à travers l’exemple de la formation en logopédie. Selon leur code déontologique, les logopèdes doivent offrir à leurs patients une prise en charge de la meilleure qualité possible, en tenant compte des spécificités et des préférences de chaque patient. Ces enjeux sont au cœur de l’approche EBP qui se définit comme l’intégration consciencieuse, explicite et appropriée des meilleures preuves issues de trois sources distinctes : 1) les preuves externes venant de la recherche scientifique ; 2) les preuves internes venant de l’expérience clinique ; 3) les preuves concernant les préférences d’un patient correctement et complètement informé. Les dispositifs pédagogiques mis en place à l’ULg pour former les futurs logopèdes à cette pratique ciblent les cinq étapes de la démarche EBP, à savoir : 1) transformer le besoin d’information en une question claire et précise, 2) trouver les meilleures données probantes issues de la recherche pour répondre à cette question, 3) évaluer de manière critique ces données, 4) combiner cette évaluation critique avec la compétence clinique du praticien et les caractéristiques individuelles du patient, ses valeurs et sa situation et 5) évaluer l’efficacité de la décision clinique et l’efficience personnelle à exécuter le processus de prise de décision. L’importance d’une approche intégrée et d’une pratique répétée sera soulignée. [less ▲]

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See detailSchizophrénie et psychopathie : Analyse des difficultés d’objectivation diagnostique à partir de la PCL-R
Matteucci, Marie; Englebert, Jérôme ULg; De Page, Louis et al

Poster (2017, May 20)

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See detailLa modalité est importante quand on mène un jugement de reconnaissance basées sur la fluence, mais les patients atteints d’amnésie ne s’en soucient pas
Thonnard, Adeline; Geurten, Marie ULg; Willems, Sylvie ULg

Poster (2017, May 20)

La reconnaissance chez les patients amnésiques repose principalement sur le sentiment de familiarité. Plusieurs études indiquent que ce sentiment de familiarité pourrait reposer sur la facilité de ... [more ▼]

La reconnaissance chez les patients amnésiques repose principalement sur le sentiment de familiarité. Plusieurs études indiquent que ce sentiment de familiarité pourrait reposer sur la facilité de traitement. Cependant, si les patients amnésiques utilisent normalement cette heuristique métacognitive est une question qui n’a pas encore été explorée de manière approfondie. Dans la présente étude, nous avons utilisé le paradigme de l'illusion de Jacoby et Whitehouse (1989) avec 8 patients atteints de troubles graves de la mémoire et 16 participants sains et appariés. La facilité de traitement a été induite lors du test de reconnaissance en présentant brièvement une amorce qui correspondait au mot devant être évalué. Les résultats préliminaires de cette étude ont révélé que la facilité de traitement induite par l’amorce augmentait les réponses de reconnaissance lorsque la phase d'étude et la phase de test étaient dans la même modalité sensorielle, mais non lorsque l'étude et le test étaient dans des modalités différentes. Les sujets sont donc capables de moduler leur utilisation de la facilité de traitement en tant qu’indice de mémoire en fonction de la non-diagnosticité perçue de cet indice. Cependant, cet effet de modalité semble limité aux participants sains. Les patients amnésiques quant à eux ne semble pas moduler leur utilisation de l'heuristique de fluence. Dans l'ensemble, ces résultats suggèrent que la facilité de traitement peut être utilisée comme un indice pour la reconnaissance dans l'amnésie. Cependant, cette utilisation est sujette à des changements métacognitifs. [less ▲]

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See detailAnatomy of the pudendal nerve
Bonnet, Pierre ULg

Conference (2017, May 20)

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See detailLe fonctionnement exécutif dans le vieillissement normal : l’effet médiateur de la vitesse de traitement et du système attentionnel
Gilsoul, Jessica ULg; Simon, Jessica ULg; Collette, Fabienne ULg

Poster (2017, May 19)

Introduction. Le vieillissement normal est associé à une diminution d’efficacité des fonctions exécutives. Cependant, la source de ces difficultés pourrait résider dans certains facteurs « non exécutifs » ... [more ▼]

Introduction. Le vieillissement normal est associé à une diminution d’efficacité des fonctions exécutives. Cependant, la source de ces difficultés pourrait résider dans certains facteurs « non exécutifs ». Dès lors, cette étude a pour but de déterminer si la vitesse de traitement et les variables attentionnelles pourraient médier l’effet de l’âge sur le fonctionnement exécutif. Méthode. Des participants jeunes (N = 104) et âgés (N = 63) ont réalisé une batterie de 21 tâches exécutives (inhibition, flexibilité, mise à jour, et coordination de double tâches), attentionnelles (alerte phasique, attention sélective, et attention soutenue), et de vitesse de traitement. Des modèles de médiation avec la vitesse de traitement et le fonctionnement attentionnel pris séparément comme médiateurs ont été réalisés. Résultats. L’attention sélective médie significativement l’effet de l’âge sur la mise à jour [ΔR2 = 7%, p < ,001]. De plus, la vitesse de traitement médie significativement l’effet de l’âge sur la flexibilité [ΔR2 = 7%, p < ,001], la mise à jour [ΔR2 = 5%, p < ,001], et la coordination de double tâches [ΔR2 = 14%, p < ,001].Discussion. La médiation de l’effet de l’âge sur la plupart des fonctions exécutives par les mesures de vitesse est en accord avec la littérature montrant une grande influence d’un ralentissement de la vitesse de traitement sur la cognition. L’effet de l’âge sur l’inhibition ne semble médié par aucune des variables attentionnelles et de vitesse, ce qui est en accord avec l’hypothèse selon laquelle l’inhibition serait la première fonction cognitive à décliner avec l’avancée en âge (Zacks & Hasher,1988). [less ▲]

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See detailLa santé mentale des étudiants en première année universitaire : du risque à la résilience
Glowacz, Fabienne ULg; Schmits, Emilie ULg

Conference (2017, May 19)

Les étudiants de première année universitaire sont soumis à un stress important : l’entrée à l’université met en jeu une série de changements touchant les différents domaines de la vie étudiante et impose ... [more ▼]

Les étudiants de première année universitaire sont soumis à un stress important : l’entrée à l’université met en jeu une série de changements touchant les différents domaines de la vie étudiante et impose des défis d’apprentissages : de savoir (la matière elle-même et le rapport au savoir attendu de l’étudiant gagnant en complexité et en amplitude et de nouveaux repères et liens sociaux. Des études ont constaté des scores élevés de détresse émotionnelle chez les étudiants par rapport aux populations non étudiantes, et de symptômes dépressifs depuis leur entrée à l’université. Cependant peu d’étudiants demandent de l’aide et reçoivent un traitement, et nombreux sont ceux qui ont tendance à ne pas percevoir un besoin d’aide. Nous avons mené une enquête en ligne ciblant les étudiants de première année de l’ULg, plusieurs dimensions de la santé mentale ont été évaluées sur base d’échelles d’auto-évaluation (Beck Depression Inventory Short Form – BDI-SF ; Liebowitz Social Anxiety Scale – LSAS, – Symptom Check-List de Dérogatis – SCL-90R). Nous nous sommes également intéressés à la résilience des étudiants et aux facteurs la soutenant, la résilience pouvant être considérée comme le maintien d’une santé mentale «suffisamment bonne » dans ce contexte de transition à l’enseignement supérieur. Les premiers résultats de l’enquête seront présentés à partir de modélisations de résilience ouvrant des pistes de prévention et d’action en vue d’accroître le sentiment de bien-être des étudiants et d’améliorer leur santé mentale, tout en soutenant leur cheminement scolaire. [less ▲]

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See detailL'esprit des lieux
Durand, Pascal ULg

Conference (2017, May 19)

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See detailLa lecture partagée pour améliorer l’entrée dans l’écrit chez des enfants issus de population défavorisée
Maillart, Christelle ULg; Binamé, Florence ULg; Vossius, Line ULg et al

Conference (2017, May 19)

Les enfants issus de populations défavorisées sont à risque de présenter des difficultés d’apprentissage en lecture. Sans intervention appropriée, le décalage entre les performances de ces enfants et leur ... [more ▼]

Les enfants issus de populations défavorisées sont à risque de présenter des difficultés d’apprentissage en lecture. Sans intervention appropriée, le décalage entre les performances de ces enfants et leur pairs persiste voire se creuse avec le temps (Lonigan et al., 2015). Cette communication présente les résultats d’une étude en intervention ciblant la littératie émergente chez de jeunes enfants scolarisés en fin de maternelle. Elle fait partie d’un projet plus large comparant les effets de différentes interventions ciblées 1) sur les précurseurs du calcul, 2) sur des activités psychomotrices ou 3) sur la littératie émergente chez trois groupes d’enfants prése. Pour cette dernière intervention, un groupe de 10 enfants d’âge préscolaire âgés de 51 mois à 70 mois, tous issus d’une école accueillant des enfants issus de milieux socio-économiques faibles, ont participé à une intervention en lecture partagée pendant dix semaines, trente minutes par jour, cinq fois par semaine. La lecture partagée est considérée comme une « bonne pratique » pour le développement de la littératie émergente (National Early Literacy Panel, 2008). Elle cible à la fois des aptitudes concernant le code (conscience phonologique ou connaissance de l’alphabet) et le sens (vocabulaire, syntaxe, grammaire narrative) (Piasta, 2016). Les performances des enfants dans les différentes mesures langagières ou de lecture, évaluées avant et après l’intervention, ont été comparées aux performances obtenues par des enfants ayant participé aux deux autres interventions. Les effets à court terme (pré, post intervention) mais aussi à long terme sur le développement du langage écrit seront présentés, permettant de distinguer des effets d’entrainement spécifique ou plus de stimulation plus globale. [less ▲]

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See detailAnalysing operando Mössbauer spectra of battery materials: a chemometric approach to the study of NaFeO2 as positive electrode material for Na-ion batteries
Stievano, Lorenzo; Sougrati, Moulay Tahar; Darwiche, Ali et al

Conference (2017, May 19)

Among the possible positive electrode materials for Na-ion batteries, iron-based oxides have been regarded as promising solids for the reversible insertion/deinsertion of Na on the basis of their ... [more ▼]

Among the possible positive electrode materials for Na-ion batteries, iron-based oxides have been regarded as promising solids for the reversible insertion/deinsertion of Na on the basis of their abundance in the Earth’s crust. In particular, O3-type NaFeO2, easily prepared from the reaction of iron oxide and Na2CO3 at 600°C, has been identified as the most interesting one from the viewpoint of both gravimetric and volumetric energy density.[1–3] Na/NaFeO2 cells cycle through a relatively flat potential plateau between 3.3 and 3.4 V vs. Na+/Na, commonly associated with the Fe4+/Fe3+ redox couple. However, if cycling is extended above 3.5 V, other irreversible reaction plateaux appear, which completely inactivate the material. 57Fe Mössbauer spectroscopy is thus a method of choice for the study of both (1) the cycling mechanism and (2) the irreversible reactions occurring above 3.5 V. In this work, operando 57Fe Mössbauer spectra were collected during the electrochemical cycling of NaFeO2 vs. Na metal using a specifically designed in situ cell,[4] and analysed using an alternative and innovating data analysis approach based on chemometric tools such as Principal Component Analysis (PCA) and multivariate curve resolution (MCR).[5,6] This approach, which allows the unbiased extraction of all possible information from the operando data, enabled the stepwise reconstruction of the “real” spectral components occurring during the cycling of NaFeO2. In this way, a clear description of the electrochemically active iron species could be obtained, allowing a clearer comprehension of the cycling mechanisms of this material vs. sodium. Références : [1] J. Zhao, L. Zhao, N. Dimov, O. Shigeto, T. Nishida, J. Electrochem. Soc. 160 (2013) A3077. [2] H. Yoshida, N. Yabuuchi, S. Komaba, in:, ECS Meet. Abstr. MA2012-02, ECS, Honolulu, 2011, p. 1850. [3] P. Barpanda, Chem. Mater. 28 (2016) 1006. [4] J.-B. Leriche, S. Hamelet, J. Shu, M. Morcrette, C. Masquelier, G. Ouvrard, M. Zerrouki, P. Soudan, S. Belin, E. Elkaïm, F. Baudelet, J. Electrochem. Soc. 157 (2010) A606. [5] R. Tauler, Chemom. Intell. Lab. 30 (1995) 133. [6] A. Voronov, A. Urakawa, W. van Beek, N.E. Tsakoumis, H. Emerich, M. Rønning, Anal. Chim. Acta 840 (2014) 20. [less ▲]

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See detailVieillissement non pathologique des fonctions exécutives : influence du polymorphisme nucléotidique val108/158met du gène COMT
Gilsoul, Jessica ULg; Manard, Marine ULg; Collette, Fabienne ULg

Poster (2017, May 19)

Introduction. Selon la Théorie des États-Duaux, les homozygotes Val sur le gène COMT possèderaient de meilleures capacités de flexibilité tandis que les individus Met/Met favoriseraient les capacités de ... [more ▼]

Introduction. Selon la Théorie des États-Duaux, les homozygotes Val sur le gène COMT possèderaient de meilleures capacités de flexibilité tandis que les individus Met/Met favoriseraient les capacités de stabilité. Ces effets génotypiques seraient amplifiés dans le vieillissement car la diminution des ressources cérébrales augmente l’influence des différences génétiques sur la cognition. Notre but est d’investiguer l’influence du polymorphisme nucléotidique COMTVal108/158Met sur les fonctions exécutives dans le vieillissement normal. Méthode. Trois fonctions exécutives ont été évaluées grâce à différentes tâches chez des participants jeunes (N=55) et âgés (N=45) portant l’un des génotypes du gène COMT (Val/Val, Val/Met, et Met/Met). Nous avons réalisé des tests t entre les deux groupes ainsi qu’une ANOVA 6 (Groupe : Jeunes-Met/Met, Jeunes-Val/Met, Jeunes -Val/Val, Âgés-Met/Met, Âgés-Val/Met, et Âgés-Val/Val) X 3 (Fonctionnement exécutif : Inhibition, Flexibilité, et Mise à jour) à mesures répétées avec le Fonctionnement exécutif comme facteur intra-sujet (p < ,05). Résultats. Jeunes et âgés différaient significativement sur les trois fonctions exécutives. Au sein des groupes jeunes et âgés, aucune différence significative n’a pu être mise en évidence entre les groupes génotypiques. De façon intéressante, le groupe des Âgés-Val/Val avait de plus faibles performances que le groupe des Jeunes-Val/Val en inhibition. Discussion. Comme attendu, nous avons trouvé un effet de l’âge sur toutes les fonctions exécutives. La différence entre les Jeunes-Val/Val et les Âgés-Val/Val en inhibition soutient l’idée d’une diminution avec l’avancée en âge des performances lorsqu’une composante de stabilité est requise par la tâche chez des individus possédant un génotype moins favorable pour cette composante. [less ▲]

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See detailLes souvenirs auxquels on ne croit plus
Vanootighem, Valentine ULg

Conference (2017, May 19)

Ces dernières années, plusieurs études ont démontré l’existence de « souvenirs » auxquels on ne croit plus (nonbelieved memories, NBMs). Typiquement, un NBM est une représentation vivace et précise d’un ... [more ▼]

Ces dernières années, plusieurs études ont démontré l’existence de « souvenirs » auxquels on ne croit plus (nonbelieved memories, NBMs). Typiquement, un NBM est une représentation vivace et précise d’un évènement que le participant a cru avoir vécu pendant un certain temps mais auquel il a un jour cessé de croire, et ce pour différentes raisons possibles (p.ex., feedback social, plausibilité de l’évènement). Dans la littérature, on constate qu’il ne s’agit pas d’un phénomène rare puisqu’il concernerait environ 20 pourcents des personnes interrogées. Aussi, quel que soit l’âge des participants, les travaux antérieurs montrent que ce type de souvenirs concernait surtout des évènements vécus durant l’enfance. Afin d’évaluer si les NMBs sont réellement spécifiques à l’enfance, nous présenterons les résultats d’une récente étude au cours de laquelle nous avons examiné l’influence de l’exemple donné dans la consigne sur l’incidence des NBMs et l’âge auquel les évènements associés ont été vécus. [less ▲]

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