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Peer Reviewed
See detailA microscopic study of barium titanate
Ghosez, Philippe ULg; Gonze, X.; Michenaud, J. P.

in Ferroelectrics (1995), 164

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See detailMicroscopic study of equine oocyte maturation within quaternary follicles
Ponthier, Jérôme ULg; Beckers, Jean-François ULg; Deleuze, Stefan ULg

in Comptes Rendus de l'Académie Bulgare des Sciences = Proceeding of the Bulgarian Academy of Sciences (2009), 62(4), 491-498

In various species a relationship between oocyte maturity and morphological characteristics of oocytes has been established. To our knowledge, little attention has been paid to the immature oocyte aspect ... [more ▼]

In various species a relationship between oocyte maturity and morphological characteristics of oocytes has been established. To our knowledge, little attention has been paid to the immature oocyte aspect under light microscopy in the equine. The aim of the study is to give a general description and analysis of the microscopic parameters of immature oocytes. Follicles from abattoir ovaries are punctured after measurement of their diameter and their cumulus-oocyte complexes are recovered. Different characters such as oocyte diameter, cumulus aspect, granulosity and polarity of ooplasm are observed under light microscopy. No correlation between the estral activity, follicle maturity, cumulus cells aspect, polarity and granulosity of ooplasm was observed. The thickness of zona pellucida differs between oocytes with polar or nonpolar ooplasm. No correlation was observed between the follicle and oocyte diameter and none of the other studied parameters showed an influence on the oocyte diameter. Results show that no character of the observed oocytes under light microscopy can be related to the follicular origin or to any other character. Further studies have to be done to compare these immature oocytes with mature ones and to find the ultrastructural origin of the characters observed under light microscopy. [less ▲]

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Peer Reviewed
See detailMicroscopic study of equine oocyte maturation within quaternary follicles.
Ponthier, Jérôme ULg; Beckers, Jean-François ULg; Deleuze, Stefan ULg

Conference (2009, February 19)

In various species a relationship between oocyte maturity and morphological characteristics of oocytes has been established. To our knowledge, immature oocyte aspect under light microscopy has been paid ... [more ▼]

In various species a relationship between oocyte maturity and morphological characteristics of oocytes has been established. To our knowledge, immature oocyte aspect under light microscopy has been paid little attention in the equine. The aim of the study is to give a general description and analyse microscopic parameters of immature oocytes. Follicles from abattoir ovaries are punctured after measurement of their diameter and their cumulus-oocyte complexes are recovered. Different characters such as oocyte diameter, cumulus aspect, granulosity and polarity of ooplasm are observed under light microscopy. No correlation between estral activity, follicle maturity, cumulus cells aspect, polarity and granulosity of ooplasm was observed. Thickness of zona pellucida differs between oocytes with polar or non polar ooplasm. No correlation was observed between follicle diameter and oocyte diameter and none of the other studied parameters showed an influence on oocyte diameter. Results show that no character of oocytes observed under light microscopy can be related to follicular origin or to any other character. Further studies have to be done to compare these immature oocytes with mature oocytes and to find the ultra-structural origin of characters observed under light microscopy. [less ▲]

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See detailMicroscopic techniques to study the interaction of new polymers within live cells
Smisdom, N.; Sanen, K.; Van Den Akker, N. et al

Poster (2013, June 19)

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See detailMicroscopie virtuelle appliquée à l'anatomie du bois
Jourez, Benoît ULg; Hérin, Michel; Gheysen, Thibaut ULg et al

Poster (2008, May 27)

La microscopie virtuelle est une approche innovante, complémentaire à la microscopie optique classique. Elle permet le traitement et la transmission d'images de coupes anatomiques digitalisées à très ... [more ▼]

La microscopie virtuelle est une approche innovante, complémentaire à la microscopie optique classique. Elle permet le traitement et la transmission d'images de coupes anatomiques digitalisées à très haute résolution. Les images peuvent être observées à l'écran, sous différents grossissements, mais aussi annotées et organisées en bases de données. Ce nouvel outil ouvert au dialogue et à l’auto-apprentissage est destiné à servir de support didactique dans le cadre de formations sur l'anatomie du bois. Le logiciel prévoit la sélection d’une coupe identifiée par l’essence et un plan ligneux dans une base de données accessible par Internet et organise la prospection de cette coupe selon différents grossissements. Au stade de développement actuel, le logiciel permet de se familiariser à la reconnaissance des plans ligneux de différentes essences forestières et met à la disposition de l'utilisateur divers outils interactifs. Il permet également à l'enseignant de pointer des éléments caractéristiques visibles à différents grossissements et d'y adjoindre des explications ou, a contrario, à pointer des éléments qui devront être identifiés par les étudiants. [less ▲]

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See detailMicroscopy and Particle Characterization
Grandfils, Christian ULg

Conference (2003, November 18)

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See detailMicrosequencing of three pregnancy-associated glycoproteins isolated from sheep placenta
El Amiri, Bouchra; Remy, Benoit; Melo de Sousa, Noelita ULg et al

in Proceedings of the 6e Journée de Rencontre Bioforum (2001)

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See detailMicrosoft Corp. contre Commission T-167/08, 27 juin 2012
Petit, Nicolas ULg

Scientific conference (2012, November 29)

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See detailLes microsphères d'acide polylactique comme matériels d'embolisation
Flandroy, P; Grandfils, Christian ULg

Conference (1990, May 28)

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Peer Reviewed
See detailMicrospherophakia-Metaphyseal Dysplasia: A 'New' Dominantly Inherited Bone Dysplasia with Severe Eye Involvement
Verloes, Alain ULg; Van Maldergem, Lionel ULg; de Marneffe, Pierre et al

in Journal of Medical Genetics (1990), 27(7), 467-71

We report a father and son affected by a hitherto unpublished bone dysplasia with moderately severe dwarfism. On initial radiographs, thickening of the diaphyses of the long bones was striking. The small ... [more ▼]

We report a father and son affected by a hitherto unpublished bone dysplasia with moderately severe dwarfism. On initial radiographs, thickening of the diaphyses of the long bones was striking. The small bones of the extremities were almost unaffected. With age, the metaphyseal deformation became more prominent. The epiphyses became irregular and their growth was delayed (particularly the femoral heads). The femoral neck showed an unusual 'lip' on the inner edge. Later, the stubby appearance of the long bones faded and, in adulthood, only enlarged metaphyses and deformed femoral necks persisted. The vertebrae showed moderate deformation with irregular flattening, and narrowing of the spinal canal with a shortened interpedicular distance. The eye defects consisted of high grade myopia, microspherophakia, lens coloboma, lens luxation, and retinal detachment. The name 'microspherophakia-metaphyseal dysplasia' is suggested for this probably autosomal dominant bone dysplasia. [less ▲]

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See detailMicrosporidia parasites disrupt the responses to cadmium exposure in a gammarid
Gismondi, Eric ULg; Rigaud, Thierry; Beisel, Jean-Nicolas et al

in Environmental Pollution (2012), 160

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See detailMicrosporidia parasites in Gammarid: a confounding factor in the evaluation of cadmium toxicity
Gismondi, Eric ULg; Rigaud, Thierry; Beisel, Jean-Nicolas et al

Conference (2011)

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See detailMicrosporum canis keratinolytic enzymes as virulence factors
Mignon, Bernard ULg

Conference (2000)

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See detailMicrosporum canis virulence factors and immunogens: first purification and characterization of a 43.5 kDa keratinolytic metalloprotease
Mignon, Bernard ULg; Brouta, F.; Descamps, F. et al

in Veterinary Dermatology (2000), 11(suppl 1), 14-40

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See detailMICROSTRUCTURAL AND PHYSICOCHEMICAL CHARACTERIZATION OF PALYGORSKITE CLAYS FROM MARRAKECH HIGH ATLAS, MOROCCO
El Boudour El Idrissi, Hicham ULg; Knidiri, Abdelouahab; Daoudi, Lahcen et al

Poster (2013, May 09)

The studied palygorskite clay mineral has been collected from several localities of Marrakech High Atlas Tertiary series. These series consist of alternation of marl, dolomite, limestone, gypsum and ... [more ▼]

The studied palygorskite clay mineral has been collected from several localities of Marrakech High Atlas Tertiary series. These series consist of alternation of marl, dolomite, limestone, gypsum and phosphatic beds. Palygorskite currently constitutes more than 90% of the clay fraction of these facies. The aim of this study is to characterise the structure and the physicochemical properties of these fibrous clays. Several technics were performed to characterise these clay sediments: X-ray diffraction (XRD) patterns to study its crystal structure. XRF analysis was performed to study the chemical compositions. Differential thermogravimetric analyses (DTA) were used to study the weight loss due to dehydration and dehydroxylation. The microstructure of these fibrous clays is determined by transmission and scanning electron microscop (TEM/SEM). Physical properties were characterised using the plasticity index of Casagrande, the test for shear strength and the oedometer test. The parameter concerning the adsorption capacity of methylene blue is also determined. The palygorskite clays of the Marrakech High Atlas consist of a silty clay of uniform appearance, greyish in color, and very low organic plastic. The thickness of deposit varies from several meters to several hundred meters. SEM and TEM observations show that palygorskite clay minerals display bundle of long fibres wish occurs as interwoven fibrous mats forming the laminae and as coatings and pore-filling, and pore-bridging cements in dolomite. These fibres are characterized by Mg rich chemical compositions, high crystalline structure, high specific surface area and excellent sorptive capacity. XRD show reflections (110) at 10.5 A, associated with all harmonics. The ATD curves show three endothermic peaks (100-200, 250-300 and 400-500 °C) corresponding to different dehydration process. A fourth exotherm peak often preceded by an endothermic reaction (800-900 °C) reflet the crystallization of new mineral phases including mullite. Palygorskite rich samples exhibit a high plasticity index of about 70. The swelling index generally increases with increasing content of palygorskite. In addition, Palygorskite rich samples exhibit high cohesion and a low friction angle. However, the density of the samples decreases with the increase of the content of palygorskite. [less ▲]

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See detailMicrostructural degeneracy associated with a two-point correlation function and its information content
Gommes, Cédric ULg; Jiao, Yang; Torquato, Salvatore

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2012), 85

A two-point correlation function provides a crucial yet an incomplete characterization of a microstructure because distinctly differentmicrostructures may have the same correlation function. In an earlier ... [more ▼]

A two-point correlation function provides a crucial yet an incomplete characterization of a microstructure because distinctly differentmicrostructures may have the same correlation function. In an earlier Letter [Gommes, Jiao, and Torquato, Phys. Rev. Lett. 108, 080601 (2012)], we addressed the microstructural degeneracy question: What is the number of microstructures compatible with a specified correlation function? We computed this degeneracy, i.e., configurational entropy, in the framework of reconstruction methods, which enabled us to map the problem to the determination of ground-state degeneracies. Here, we provide a more comprehensive presentation of the methodology and analyses, as well as additional results. Since the configuration space of a reconstruction problem is a hypercube on which a Hamming distance is defined, we can calculate analytically the energy profile of any reconstruction problem, corresponding to the average energy of allmicrostructures at a given Hamming distance from a ground state. The steepness of the energy profile is a measure of the roughness of the energy landscape associated with the reconstruction problem, which can be used as a proxy for the ground-state degeneracy. The relationship between this roughness metric and the ground-state degeneracy is calibrated using a Monte Carlo algorithm for determining the ground-state degeneracy of a variety of microstructures, including realizations of hard disks and Poisson point processes at various densities as well as thosewith known degeneracies (e.g., single disks of various sizes and a particular crystalline microstructure). We show that our results can be expressed in terms of the information content of the two-point correlation functions. From this perspective, the a priori condition for a reconstruction to be accurate is that the information content, expressed in bits, should be comparable to the number of pixels in the unknown microstructure. We provide a formula to calculate the information content of any two-point correlation function, which makes our results broadly applicable to any field in which correlation functions are employed. [less ▲]

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See detailMicrostructural evolution of a TiO2 mesoporous single layer film under calcination: Effect of stabilization and repeated thermal treatments on the film crystallization and surface area
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Dubreuil, Olivier et al

in Thin Solid Films (2012), 520

This study quantifies the highest perturbation encountered by the first layer of a TiO2 12 layers-mesoporous coating, which is submitted to a multistep calcination process. Besides, we propose an ... [more ▼]

This study quantifies the highest perturbation encountered by the first layer of a TiO2 12 layers-mesoporous coating, which is submitted to a multistep calcination process. Besides, we propose an alternative thermal treatment in order to limit the degradation induced by repeated calcinations. This paper reports and compares the modifications in film thickness, surface area, anatase crystallite size and global crystallinity of films obtained from different thermal treatments. It defines the maximum crystal size compatible with the preservation of the mesoarchitecture initially induced by templating. Differences in microporosity and rate of crystallization are also discussed. [less ▲]

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See detailMicrostructural size effects on mechanical properties of high purity nickel
Keller, Clément ULg; Hug, E.; Feaugas, X.

in International Journal of Plasticity (2011), 27

The aim of this article is to provide experimental results in order to understand the microstructural size effects which occur with a decrease in the thickness of polycrystalline nickel samples from 3.2 ... [more ▼]

The aim of this article is to provide experimental results in order to understand the microstructural size effects which occur with a decrease in the thickness of polycrystalline nickel samples from 3.2 mm to 12.5 lm. The influence of the thickness, grain size and ratio thickness to grain size on the mechanical properties and strain hardening were investigated by mechanical tests and TEM observations. The results show the presence of three different domains of mechanical behaviour: polycrystalline, multicrystalline and quasi-single crystalline depending on the thickness and on the number of grains across the thickness. The transition between the three domains is due to the occurrence of surface effects involving a decrease in the long-range internal backstress revealed by the TEM observations. [less ▲]

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