http://hdl.handle.net/2268/151 Search this channel search http://orbi.ulg.ac.be/simple-search http://hdl.handle.net/2268/148636 Title: Quantization of pore corrugation in SBA-15 by image analysis of electron tomograms <br/> <br/>Author, co-author: Friedrich, Heiner; Gommes, Cédric; de Jongh, Petra; de Jong, Krijn Fri, 17 May 2013 08:30:19 GMT http://hdl.handle.net/2268/148635 Title: 15 Minutes about SAXS and gels <br/> <br/>Author, co-author: Gommes, Cédric; Goderis, Bart; Pirard, Jean-Paul Fri, 17 May 2013 08:29:46 GMT http://hdl.handle.net/2268/148633 Title: SAXS Data Analysis of Ordered and Disordered Morphologies With Gaussian Random Field Models <br/> <br/>Author, co-author: Gommes, Cédric; Goderis, Bart Fri, 17 May 2013 08:28:13 GMT http://hdl.handle.net/2268/148632 Title: Characterization of nanometer-scale roughness in SBA-15 mesoporous silica using image analysis of electron tomograms <br/> <br/>Author, co-author: Friedrich, Heiner; Gommes, Cédric; de Jongh, Petra; de Jong, Krijn Fri, 17 May 2013 08:27:40 GMT http://hdl.handle.net/2268/148539 Title: Optimization of the formation of vinyldithiins, therapeutic compounds from garlic <br/> <br/>Author, co-author: DETHIER, Bérénice; Hanon, Emilien; Maayoufi, Said; Nott, Katherine; Fauconnier, Marie-Laure <br/> <br/>Abstract: Allyl sulfides, ajoenes and vinyldithiins are the three main groups of volatile organosulfur compounds that are formed when garlic is crushed. The manner garlic is processed (nature of the extraction medium, temperature…) has a major influence on their relative proportion and the amounts produced. It has been proven recently that the vinyldithiins are at the origin of garlic’s capacity to prevent adipocytes development. Their incorporation in garlic-based nutraceuticals is thus particularly interesting. In this context, this work aims to optimize the production of vinyldithiins from garlic. After having determined the best garlic origin (Spanish) and the best oil for the extraction (olive or sunflower oil), the extraction conditions were optimized (1/2 (w/w garlic oil), 37 °C, 6 h) and 133 mg of vinyldithiins was obtained from 100 g of fresh garlic. Carrying out the extraction under microwave irradiation allowed increasing the yield 3.6-fold (yield 486 mg of vinyldithiins from 100 g of fresh garlic). This study may also contribute to the development of new garlic derived high value products by enhancing the comprehension of their formation. Wed, 15 May 2013 19:19:00 GMT http://hdl.handle.net/2268/148521 Title: Preparation of new organoclays in supercritical carbon dioxide and their industrial potential in polymer nanocomposites <br/> <br/>Author, co-author: Naveau, Elodie Wed, 15 May 2013 12:53:38 GMT http://hdl.handle.net/2268/148490 Title: Enzymatic synthesis, surface and lipid interaction properties of novel rhamnolipids <br/> <br/>Author, co-author: Nott, Katherine; Richard, Gaetan; Deleu, Magali <br/> <br/>Abstract: Amongst glycolipidid biosurfactants, rhamnolipids have drawn particular attention as they have several interesting biological properties such as antimicrobial, antiphytoviral, zoosporicidal and plant defense elicitor activities [1-3]. It is generally recognised that these activities must be linked to the interaction of these molecules with constituents of biological membranes [4] but the detailed mechanism is far from being fully understood. The objective of this work is double. First, it aims to investigate a new strategy of synthesis for the production of novel rhamnolipids [5] that could exhibit properties as promising for industrial and environmental applications as their natural counterparts while avoiding the use of the pathogenic Pseudomonas aeruginosa for their production. Secondly, their basic surface properties (critical aggregation concentration, surface tension at CAC and interfacial behaviour of their monolayer) and their interaction with model membranes are investigated in relation with their structure in order to give insight about the mechanism of their biological actions. [1] Vatsa P. et al. Int. J. Mol. Sci. 2010;11:5095. [2] Varnier A-L. et al. Plant, Cell Environ. 2009;32:178. [3] Lang S. et al. Appl. Microbiol. Biotechn. 1999;51:22. [4] Aranda F.J. et al. Langmuir. 2007;23:2700. [5] Nott K. et al. Process Biochemistry, http://dx.doi.org/10.1016/j.procbio.2012.11.019 Wed, 15 May 2013 06:47:29 GMT http://hdl.handle.net/2268/148426 Title: Structural characterization of disulfide-bridged-peptides by a combined use of ETD and Ion-Mobility mass spectrometry <br/> <br/>Author, co-author: Massonnet, Philippe; Quinton, Loïc; Smargiasso, Nicolas; Gilles, Nicolas; De Pauw, Edwin Tue, 14 May 2013 07:31:38 GMT http://hdl.handle.net/2268/148363 Title: Electroinitiated polymerization <br/> <br/>Author, co-author: Jérôme, Christine <br/> <br/>Abstract: Electroinitiated polymerization, a method particularly relevant in coating technology, offers the unique opportunity of imparting permanent functionality/reactivity to a variety of surfaces, provided that the solid substrate is (semi)conducting. By focusing on the electroinitiation of acrylic monomers, basic concepts and some tools dedicated to the analysis of this peculiar polymerization process are discussed in this chapter. The important role of this polymerization method in the field of conjugated polymers is also highlighted. Finally, this chapter concludes with the opportunities and future challenges of this technology. Mon, 13 May 2013 11:46:15 GMT http://hdl.handle.net/2268/148128 Title: Enzymatic synthesis and surface properties of novel rhamnolipids <br/> <br/>Author, co-author: Nott, Katherine; Richard, Gaetan; Laurent, Pascal; Jérôme, Christine; Blecker, Christophe; Wathelet, Jean-Paul; Paquot, Michel; Deleu, Magali <br/> <br/>Abstract: New rhamnolipids were obtained via the development of a synthesis procedure consisting of two biocatalyzed steps. In the first step, naringinase was used to introduce a primary alcohol function onto rhamnose by glycosylation of 1,3-propanediol. In the second step, immobilized lipase B from Candida antarctica catalyzed the esterification of the primary hydroxyl group with mono- and di-carboxylic fatty acids of increasing chain length (from C8 to C14). For the monoic acids, the initial rate and 24 h yield decreased with increasing chain length. For the dioic acid, the number of carbon atoms of the acid did not influence these parameters. The new rhamnolipid obtained with tetradecanoic acid showed very good surface properties. At pH 5, it had a very low critical aggregation concentration of 1.70 M and it diminished water’s surface tension to 27.6 mN/m. It was also able to form stable insoluble monolayers. On the other hand, the rhamnolipid formed with tetradecanedioic acid showed far less interesting surface properties. Fri, 10 May 2013 08:35:21 GMT http://hdl.handle.net/2268/148056 Title: Macrocyle-embedded b-lactams as novel inhibitors of the Penicillin Binding Protein PBP2a from MRSA <br/> <br/>Author, co-author: Dive, Georges; Bouillon, Camille; Sliwa, Aline; Valet, Bénédicte; Verlaine, Olivier; Sauvage, Eric; Marchand-Brynaert, Jacqueline Wed, 08 May 2013 07:55:02 GMT http://hdl.handle.net/2268/147911 Title: Synthesis and fading of eighteenth-century Prussian blue pigments: a combined study by spectroscopic and diffractive techniques using laboratory and synchrotron radiation sources <br/> <br/>Author, co-author: Samain, Louise; Grandjean, Fernande; Long, Gary J.; Martinetto, Pauline; Bordet, Pierre; Sanyova, Jana; Strivay, David Sun, 05 May 2013 10:10:15 GMT http://hdl.handle.net/2268/147889 Title: Valorisation des produits issus des feuilles de betteraves : extraction de molécules à note verte <br/> <br/>Author, co-author: Marlier, Michel; Thonart, Philippe; du Jardin, Patrick; Ongena, Marc; Fauconnier, Marie-Laure Fri, 03 May 2013 14:43:46 GMT http://hdl.handle.net/2268/147888 Title: Valorisation des produits issus des feuilles de betteraves : extraction de molécules à note verte - Rapport final <br/> <br/>Author, co-author: Wathelet, Jean-Paul; Thonart, Philippe; du Jardin, Patrick; Ongena, Marc; Fauconnier, Marie-Laure Fri, 03 May 2013 14:43:21 GMT http://hdl.handle.net/2268/147887 Title: Valorisation des produits issus des feuilles de betteraves : extraction de molécules à note verte <br/> <br/>Author, co-author: Wathelet, Jean-Paul; Thonart, Philippe; du Jardin, Patrick; Ongena, Marc; Fauconnier, Marie-Laure Fri, 03 May 2013 14:42:56 GMT http://hdl.handle.net/2268/147886 Title: Recherches de lignées aromatiques d'Abies par hybridation somatique <br/> <br/>Author, co-author: Wathelet, Jean-Paul; Fauconnier, Marie-Laure; Michels, Franck; Misson, Jean-Pierre Fri, 03 May 2013 14:42:24 GMT http://hdl.handle.net/2268/147772 Title: Les venins d'animaux, nouvelle panacée? <br/> <br/>Author, co-author: Echterbille, Julien; Quinton, Loïc; De Pauw, Edwin <br/> <br/>Abstract: Araignées, serpents, scorpions,… autant d’animaux ayant une place particulière dans l’imaginaire collectif. Fascinants, horripilants voire même terrifiants, les adjectifs ne manquent pas pour qualifier les réactions qu’ils suscitent auprès des populations. Que dire alors de la peur engendrée par leur venin. Une simple piqûre, morsure ou contact peut s’avérer extrêmement dangereux voire létal... Thu, 02 May 2013 08:21:24 GMT http://hdl.handle.net/2268/147771 Title: MALDI-FTICR MS Imaging as a Powerful Tool to Identify Paenibacillus Antibiotics Involved in the Inhibition of Plant Pathogens <br/> <br/>Author, co-author: Debois, Delphine; Ongena, Marc; Cawoy, Hélène; De Pauw, Edwin <br/> <br/>Abstract: Nowadays, microorganisms are more and more often used as biocontrol agents for crop protection against diseases. Among them, bacteria of Bacillus and Paenibacillus genders are already used as commercial biocontrol agents. Their mode of action is supposed to be related to their production of antibiotics, such as cyclic lipopeptides, which exhibit great antimicrobial activities. We chose to work with a Paenibacillus polymyxa strain (Pp56) very resistant to various microorganisms. The bacteria were grown simultaneously with Fusarium oxysporum and we applied matrix-assisted laser desorption/ionization-Fourier transform ion cyclotron resonance (MALDI-FTICR) mass spectrometry to identify the antibiotics compounds present in the fungus growth inhibition area. We, therefore, identified fusaricidins A, B, and C and numerous members of the LI-F antibiotics family. MALDIFTICR mass spectrometry imaging was then used to follow the diffusion of lipopeptides involved in the inhibitory activity over time. We analyzed the molecular content of the inhibitory area at different Pp56 and Fusarium incubation durations and concluded that some lipopeptides such as fusaricidin B and a mixture of LI-F05b/06b/08a were mainly involved in the defense mechanism of Pp56. Our study confirms that MALDI imaging may be a powerful tool to quickly determine which molecular species is involved in an antagonism with another microorganism, avoiding time-consuming steps of extraction, purification, and activity tests, which are still commonly used in microbiology. Thu, 02 May 2013 08:18:43 GMT http://hdl.handle.net/2268/147445 Title: MOLECULAR DYNAMICS STUDY OF A DNA OLIGONUCLEOTIDE AND ITS COMPLEXES WITH SPECIFIC BINDERS UNDER MECHANICAL STRESS <br/> <br/>Author, co-author: Fresch, Barbara; Remacle, Françoise Sat, 27 Apr 2013 14:53:51 GMT http://hdl.handle.net/2268/147444 Title: Typical response of quantum pure states <br/> <br/>Author, co-author: Fresch, Barbara; Moro, Giorgio J. Sat, 27 Apr 2013 14:46:11 GMT