Aperçu du régime alimentaire de l'éléphant de forêt, Loxodonta africana cyclotis, dans le Parc National d'Odzala, République du Congo

in Mammalia (1997), 61(1), 127-130

Fin du Millénaire - fin de l'Agriculture

in Bulletin de la Société Géographique de Liège (1997), 33

Maastricht : si proche, si loin ?

Article for general public (1997)

Entretien avec Jacob Cohen, recteur de l'Université de Maastricht, sur les rapports au sein du réseau ALMA

Comment « débloquer » la société française ?

Article for general public (1997)

Entretien avec le sociologue Michel Crozier, directeur de recherches émérite au CNRS

"Exolysosomes", Enzyme-Containing Vesicles in the Ecdysial Space of Molting Crabs

in Journal of Structural Biology (1997), 119(3), 247-59

Free vesicle-like bodies (VLBs) present in the ecdysial space of cuticle regions undergoing degradation during preecdysis of the Atlantic shore crab Carcinus maenas have been interpreted either as ... [more ▼]

Free vesicle-like bodies (VLBs) present in the ecdysial space of cuticle regions undergoing degradation during preecdysis of the Atlantic shore crab Carcinus maenas have been interpreted either as infectious organisms or as secretion structures associated with degradation of the old cuticle. Ultrastructural, cytochemical, and immunocytological investigations were performed to test these hypotheses and to see whether VLBs are peculiar to this crab species. Similar VLBs were systematically found in two other preecdysial crabs, Cancer pagurus and Macropipus puber. In Car, maenas, they originate during early premolt inside Golgi buddings and are often gathered into large vacuoles in epidermal cells. The histochemical azo-dye technique and a cerium-based cytochemical method revealed acid phosphatase activity in both the ecdysial space and the VLBs, while Feulgen's method and immunocytological labeling always failed to reveal any DNA or RNA in either the ecdysial space or the VLBs. We conclude that VLBs are not infectious organisms but "extracellular" cuticle-degrading organelles of lysosomal origin and propose to coin them "exolysosomes." [less ▲]

Symphonie au CHU

Article for general public (1997)

Entretien avec l'ingénieur Georges de Mullewie, le chef d'orchestre Pierre Bartholomée et l'administrateur du CHU Georges Bovy au sujet d'un concert symphonique organisé au Centre Hospitalier ... [more ▼]

Entretien avec l'ingénieur Georges de Mullewie, le chef d'orchestre Pierre Bartholomée et l'administrateur du CHU Georges Bovy au sujet d'un concert symphonique organisé au Centre Hospitalier Universitaire du Sart Tilman, sur les conditions acoustiques, artistiques et symboliques d'un tel événement en milieu hospitalier et sous la verrière du CHU [less ▲]

Field observations of the spawning behaviour of European grayling

in Journal of Fish Biology (1997), 51(5), 1066-1068

During observations of the River Ourthe, Belgium, 70 spawning attempts were recorded during the reproductive period of the European grayling. Thirty-six per sent of the spawning attempts proceeded to ... [more ▼]

During observations of the River Ourthe, Belgium, 70 spawning attempts were recorded during the reproductive period of the European grayling. Thirty-six per sent of the spawning attempts proceeded to completion, while interference by another male may explain some of the incomplete acts. Sneaking behaviour was observed and one spawning act included two males and one female. (C) 1997 The Fisheries Society of the British Isles. [less ▲]

Diagnosis of lower airways dysfunction

in Proceedings of the 6th Annual Scientific Meeting of the European College of Veterinary Surgeons (1997)

Effect of pentoxifylline on cell cycle and radiosensitivy of human colon and Cervical cancer cells

in Radiotherapy & Oncology (1997), 43(supp 2), 77

An adaptive high-gain observer for nonlinear systems

in 36th IEEE Conf. on Decision and Control (1997)

In this paper we present a high-gain observer for a general class of nonlinear SISO systems for which the high-gain parameter is determined on-line in an adaptive fashion. The adaptation scheme is simple ... [more ▼]

In this paper we present a high-gain observer for a general class of nonlinear SISO systems for which the high-gain parameter is determined on-line in an adaptive fashion. The adaptation scheme is simple and universal in the sense that it is independent of the system the observer is designed for. We prove that the observer output error becomes smaller than a user specified bound for large times and that the adaptation converges. The assumptions required for the adaptive high-gain observer are the same as for the nonadaptive high-gain observer, namely that the system is uniformly observable for any u(t) [less ▲]