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Peer Reviewed
See detailDevelopment of original pyridinic analogues of nimesulide as cycloxygenase inhibitors
Renard, Jean-François ULg; de Leval, Xavier; Pirotte, Bernard ULg

Conference (2007, October)

Detailed reference viewed: 7 (1 ULg)
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See detailDevelopment of paleoseismic trench logging and dating techniques: a case study on the Central North Anatolian Fault
Fraser, Jeff; Pigati, J.S.; Hubert, Aurelia ULg et al

in Geophysical Research Abstracts (2007, April), 9

Detailed reference viewed: 16 (0 ULg)
See detailDevelopment of photo- or thermo-reversible cross-linked recyclable shape-memory materials
Defize, Thomas ULg; Riva, Raphaël ULg; Thomassin, Jean-Michel ULg et al

Conference (2015, September 01)

Shape-memory polymers (SMPs) are remarkable materials able to switch from a stressed deformed state (temporary shape) to their initial relaxed state (permanent shape) by the application of a stimulus ... [more ▼]

Shape-memory polymers (SMPs) are remarkable materials able to switch from a stressed deformed state (temporary shape) to their initial relaxed state (permanent shape) by the application of a stimulus, such as heat or light. Typically, the shape-memory property is generally observed for chemically or physically cross-linked polymers that exhibit an elastomeric behavior above a phase transition, e.g. glass or melting transition. As an example, cross-linked semi-crystalline poly(ε-caprolactone) (PCL) is widely studied for the development of SMPs. As most of SMPs are irreversibly cross-linked material, their reprocessing is impossible preventing any recycling. Thereby, reversible reactions, allowing the formation/cleavage of the network, raise tremendous interest for the development of new SMPs. Recently, we reported the preparation reversibly cross-linked PCL-based SMP using the Diels-Alder (DA) reaction between furan and maleimide end-groups of 4-arm star-shaped PCL, well-known to create reversible bonds. After implementation, this shape-memory material was demonstrated to be recyclable, and was characterized by excellent fixity and recovery before and after recycling experiments. However, the relatively low retro DA temperature of the furan-maleimide adducts led to an inelastic deformation during shape-memory tensile cycles. In order to get rid of this drawback, an alternative approach was investigated. The substitution of the DA reaction by a photo-reversible reaction, typically the photo-induced (2+2) cycloaddition of coumarins, was proposed to prepare cross-linked PCL matrix presenting one-way and two-way memory properties, since photolabile adducts are supposed to be stable during shape-memory tensile cycles. [less ▲]

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See detailDevelopment of pH–responsive nanocarriers using trimethylchitosans and methacrylic acid copolymer for siRNA delivery
Dehousse, Vincent ULg; Garbacki, Nancy ULg; Colige, Alain ULg et al

in Biomaterials (2010), 31

RNA interference-based therapies are dependent on intracellular delivery of siRNA. The release of siRNA from the endosomal compartment may be a rate limiting step in the transfection process. The purpose ... [more ▼]

RNA interference-based therapies are dependent on intracellular delivery of siRNA. The release of siRNA from the endosomal compartment may be a rate limiting step in the transfection process. The purpose of this study was to produce pH–responsive nanocarriers made of trimethylchitosan (TMC). To this end, pHsensitive methacrylic acid (MAA) copolymer was added to TMC–siRNA formulations. Four different TMCs associated or not with MAA were evaluated as siRNA carriers. Nanoparticles were characterized in terms of size, surface charge, morphology and interaction with siRNA. A swelling behaviour due to a decrease in pH was observed and was found to be dependent on MAA content in the complexes. In vitro experiments aimed at evaluating how the capacity of the nanocarriers to transfect siRNA in L929 cells was affected by MAA content. Confocal microscopy experiments showed that fluorescent MAA-containing particles exhibit a different distribution pattern inside the cells comparing to their counterpart without this pH-sensitive polymer. Transfection efficiency was investigated by RhoA mRNA expression inhibition. MAA–TMC–siRNA complexes were able to transfect L929 cells with greater efficiency than corresponding TMC–siRNA complexes. This study gives an insight into the opportunity of pH-sensitive nanocarriers for siRNA delivery. Such formulations may represent an attractive strategy to improve endosomal escape of siRNA. [less ▲]

Detailed reference viewed: 60 (21 ULg)
Peer Reviewed
See detailDevelopment of pilot Trans-European service (Rhine-Main-Danube) for combined freight transport between Walloon region and the Black Sea
Marchal, Jean ULg; Kicheva, D.; Petkov, N. et al

in Eigth international conference on Marine sciences and Technologies “Balack Sea 2006” (2006, September)

Detailed reference viewed: 21 (0 ULg)
Peer Reviewed
See detailDevelopment of Procedural Learning in Children : The “Toy Task”
Lejeune, Caroline ULg; Meulemans, Thierry ULg

Poster (2008)

The authors generally agree that procedural learning abilities play an important role in the child development and that they are present early in childhood. However, few studies have been carried out in ... [more ▼]

The authors generally agree that procedural learning abilities play an important role in the child development and that they are present early in childhood. However, few studies have been carried out in this area because of the difficulty to develop tests specifically designed for the evaluation of these capacities in young children. In this study, we presented a new task aimed to evaluate visuo-motor skill learning in the young child. The purpose of the present study was to explore whether procedural learning abilities are present in the same extent in 4-year as 7- and 10-year-old children. Our sample is composed of 60 children divided into 3 age-groups. The task is composed of 5 blocks of 12 trials during which each subject has to use a reversed mouse of a computer in order to “catch” different toys appearing on the screen; 2 blocks of 12 trials was administered after a 15 minutes delay. Our results show an important difference between the groups for the first block; on the other hand, for the next blocks, the results show an absence of age-related difference between participants in our perceptive-motor skill learning task, confirming the idea according to which procedural learning abilities are efficient early in development (the difference observed during the first block being probably due to the intervention of executive mechanisms). [less ▲]

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See detailDevelopment of process control system for potential use of direct injection spraying technology
Aissaoui, Abdellah; Lebeau, Frédéric ULg; el bahir, et al

in Progress in Agricultural Engineering Sciences (2011), 7(1), 33-45

Small-scale farmers face to actual difficulties of applying pesticides accurately and safely on vegetables crops. They mainly use hand operated sprayers. As an issue, a small direct injection system based ... [more ▼]

Small-scale farmers face to actual difficulties of applying pesticides accurately and safely on vegetables crops. They mainly use hand operated sprayers. As an issue, a small direct injection system based on a five meter’s parallel boom layout was designed to improve chemical application. The boom layout was optimized to obtain the same minimal time lag response for the ten nozzles. The dynamic of the system was modeled using Simulink TM as first order model with delay. Two control strategies were implemented using PID (Proportional Integral Derivative) feedback control loops to monitor tracer injection (fluorescing) proportionally to simulated forward speed (from 0.6 to 1.2 m/s) and to control the constant operating pressure (constant carrier flow strategy) or the variable operating pressure proportionally to the injected chemical amount (variable total flow strategy). Different forward speed changes were induced using steps up and down, ramps, sine waves and sweeps excitations to evaluate the control feedback. The system stability was tested for its ability to maintain the expected concentration and application rate. The results show that the time lag remains less than 3 s (dead time < 2 s, time constant < 1 s) and the system keeps stable for the maximal speed variation (ΔV) and acceleration (ā) tested (ΔV = 200%, ā = 0.48 m/s2) which induce less than 10% variation of application rate. [less ▲]

Detailed reference viewed: 60 (20 ULg)
See detailDevelopment of products for GNSS users at the Belgian Solar-Terrestrial Centre of Excellence
Warnant, René ULg; Lejeune, Sandrine; Stankov, Stanimir et al

Conference (2008, December)

Detailed reference viewed: 117 (22 ULg)
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See detailDevelopment of PSII photochemistry after a single white flash in etiolated barley leaves
Franck, Fabrice ULg

in Baltscheffsky, M. (Ed.) Current Research in Photosynthesis (1990)

Detailed reference viewed: 6 (0 ULg)
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Peer Reviewed
See detailDevelopment of psoriasiform skin lesions under anti-TNF therapy: a genetic link?
Cleynen, I.; Claes, B.; Nuytten, H. et al

in Conference Abstract Book (2008)

Detailed reference viewed: 23 (3 ULg)