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See detailCharacterization of polyacrylonitrile films grafted onto nickel by ellipsometry, atomic force microscopy and X-ray reflectivity
Calberg, Cédric ULg; Mertens, Marc; Jérôme, Robert ULg et al

in Thin Solid Films (1997), 310(1-2), 148-155

The thickness and roughness of polyacrylonitrile films electrografted on a nickel surface have been measured by ellipsometry, atomic force microscopy and X-ray reflectivity. From combined ellipsometry and ... [more ▼]

The thickness and roughness of polyacrylonitrile films electrografted on a nickel surface have been measured by ellipsometry, atomic force microscopy and X-ray reflectivity. From combined ellipsometry and X-ray reflectivity measurements, accurate values for the refractive indices of polyacrylonitrile and nickel have been derived at a 6328-Åwavelength. Dependence of the film thickness on the monomer concentration has been quantified for the first time. Furthermore, the thickness of the polyacrylonitrile (PAN) film is related to the nature of the solvent, depending on whether it is a good solvent for PAN (dimethylformamide; DMF) or not (acetonitrile; ACN). [less ▲]

Detailed reference viewed: 65 (1 ULg)
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See detailCharacterization of polygalacturonase from Kluyveromyces marxianus.
Campos, D.; Rikir, R.; Taillieu, X. et al

in Archives Internationales de Physiologie et de Biochimie (1993), 101(B1-B25),

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See detailCharacterization of porous polylactide foams by image analysis and impedance spectroscopy
Maquet, Véronique; Blacher, Silvia ULg; Pirard, René ULg et al

in Langmuir (2000), 16(26), 10463-10470

The texture of highly porous polylactide foams prepared by freeze-drying of poly-L-lactide (L-PLA) and poly-DL-lactide (DL-PLA) solutions of various concentrations was investigated by two novel ... [more ▼]

The texture of highly porous polylactide foams prepared by freeze-drying of poly-L-lactide (L-PLA) and poly-DL-lactide (DL-PLA) solutions of various concentrations was investigated by two novel methodologies, image analysis and impedance spectroscopy. Image analysis of scanning electron micrographs of transverse cross-sections at two different magnifications gave information on both the macroporosity (1 mum < width 10 <mu>m) and ultramacroporosity (width > 10 mum). Impedance spectroscopy was used to investigate the transport properties of the three-dimensional porous matrices by measurement of ionic conduction. Image analysis showed that: (a) the macroporosity, which mainly contributes to porosity, is independent of the sample composition; (b) when the concentration of the polymer solution is increased, the density of the ultramacropores decreases and their average diameter increases; (c) the distribution of the ultramacropores is more homogeneous in the semicrystalline L-PLA. foams than in the amorphous DL-PLA counterparts, in which the ultramacropores tend to make clusters. The dielectric properties changed at low frequency, in relation to modifications in the ultramacroporosity. Ultramacropores of the L-PLA foams were found to be more open and more sensitive to the concentration of the polymer solutions compared with DL-PLA. Expectedly, the mechanical properties of the PLA foams changed with the structure of the ultramacroporous network. These results encourage further investigations on the texture of porous supports, to collect pertinent information on the physical macro- and ultramacroenvironment in which cells will reside. [less ▲]

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See detailCharacterization of porous texture of hyperporous materials by mercury porosimetry using densification equation
Pirard, René ULg; Alié, Christelle ULg; Pirard, Jean-Paul ULg

in Powder Technology (2002), 128(2-3), 242-247

The purpose of this paper is to propose a method of analyzing the mercury porosimetry data in the case of materials called hyperporous. This class of material does not undergo intrusion by mercury ... [more ▼]

The purpose of this paper is to propose a method of analyzing the mercury porosimetry data in the case of materials called hyperporous. This class of material does not undergo intrusion by mercury; instead, it shrinks under the mercury isostatic pressure and its density increases. The phenomenon is partially or completely irreversible. The proposed method enables computing the pore volume distribution as a function of the pore size in the same way as Washburn's method does in the case of mercury intrusion. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailCharacterization of preferential activity on platelet thromboxane A2 receptors of BM-613, a new thromboxane A2 antagonist
Hanson, Julien ULg; Rolin, S.; De Leval, X. et al

in Fundamental & Clinical Pharmacology (2004)

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See detailCharacterization of pregnancy-associated glycoproteins extracted from zebu (Bos indicus) placentas removed at different gestational periods
Melo de Sousa, Noelita ULg; Remy, Benoit; El Amiri, Bouchra et al

in Reproduction Nutrition Development (2002), 42(3), 1-15

In the present work, two biochemical approaches were used to characterize PAGs isolated from Bos indicus fetal cotyledons removed at different gestational ages. The first procedure included acidic and ... [more ▼]

In the present work, two biochemical approaches were used to characterize PAGs isolated from Bos indicus fetal cotyledons removed at different gestational ages. The first procedure included acidic and ammonium sulfate precipitations, anion and cation exchange chromatographies and the second included pepstatin-agarose affinity chromatography. A bovine PAG radioimmunoassay was used to monitor the immunoreactivity throughout the isolation procedures. The most immunoreactive fractions issued from cation exchange and affinity chromatographies were analyzed by SDS-PAGE and Western blotting, before transfer to a polyvinylidene difluoride (PVDF) membrane for NH2-microsequence determination. Use SDS-PAGE and Western blotting, different isoforms of PAG with apparent molecular masses of 51 to 69 kDa and isoelectric points varying from 4.4 to 6.7 were identified in the placentas from different gestational ages. N-terminal microsequencing (10 to 25 aa long) indicates the expression of one single terminal amino acid sequence in the Bos indicus placenta, which is 100% identical to the bovine PAG-1. [less ▲]

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See detailCharacterization of printed circuit boards from scrap printers
Silvas, Flávia; de Moraes, Viviane; Bortolini, Guilherme et al

in Yurko, James; Zhang, Lifeng; Allanore, Antoine (Eds.) Proceedings TMS 2014 143rd ANNUAL MEETING & EXHIBITION (2014, April)

Printed circuit boards (PCB) are particularly problematic to recycle because of the heterogeneous mix of organic materials, metals, and glass fiber. PCBs are found in almost every electroelectronic ... [more ▼]

Printed circuit boards (PCB) are particularly problematic to recycle because of the heterogeneous mix of organic materials, metals, and glass fiber. PCBs are found in almost every electroelectronic equipment and their recycling process involves a pre-treatment to separate the products which contain targeted metals. In this work, a physical processing involving sequential shredding and hammer milling were used to obtain a comminuted sample from scrap printers PCBs. The thus prepared sample was analyzed for particle size distribution and by optical microscopy as well was subjected to pyrolysis, leachabilty and chemical composition determination by XRF. The metals concentration was determined by ICP and AAS. The PCBs have been also analyzed by SEM-EDS (micro-analysis and X-ray mapping). The results show that the studied PCBs are lead free, multilayer with 4 copper layers, have 45% of metals and the copper is present in significantly higher concentration than the rest of the metals. [less ▲]

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See detailCharacterization of prolatinomas resistant to dopaminergic agonists
Vroonen, Laurent ULg; Tamagno, G.; Naves, L. et al

in 18th Meeting of the Belgian Endocrine and Metabolic societies : Bruxelles, 25 octobre 2008 (2008, October)

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See detailCharacterization of prolatinomas resistant to dopaminergic agonists
Vroonen, Laurent ULg; Daly, Adrian ULg; Beckers, Albert ULg

in ENDO 2010 : The 92nd Annual Meeting (2010, June)

Detailed reference viewed: 13 (3 ULg)
See detailCharacterization of prolatinomas resistant to dopaminergic agonists
Vroonen, Laurent ULg; Tamagno, G.; Naves, L. et al

in 19 Meeting of the Belgian Endocrine and Metabolic societies (2009)

Detailed reference viewed: 20 (2 ULg)