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See detailIsolement et structure de trois bases anhydronium du Strychnos usambarensis du Rwanda
Caprasse, Maryse; Coune, Claude; Angenot, Luc ULg

in Journal de Pharmacie de Belgique (1983), 38(3), 135-139

Three anhydronium bases have been isolated by DCC Chromatography. They were identified as melinonine F, dihydr-5,6 flavopereirine and the novel normelinonine F through their spectroscopic data and ... [more ▼]

Three anhydronium bases have been isolated by DCC Chromatography. They were identified as melinonine F, dihydr-5,6 flavopereirine and the novel normelinonine F through their spectroscopic data and comparison with authentic samples. [less ▲]

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See detailIsolement par DCCC (Droplet Counter Current Chromatography) de la fluorocurarine à partir du Strychnos usambarensis du Rwanda
Caprasse, Maryse; Coune, Claude; Angenot, Luc ULg

in Journal de Pharmacie de Belgique (1981), 36(4), 243-248

Fluorocurarine is isolated from the root barks of Strychnos usambarensis by Droplet Counter Current Chromatography (DCCC), a new technique of liquid/liquid chromatography. This quaternary alkaloid ... [more ▼]

Fluorocurarine is isolated from the root barks of Strychnos usambarensis by Droplet Counter Current Chromatography (DCCC), a new technique of liquid/liquid chromatography. This quaternary alkaloid (previously identified in curare and South-Amercican Strychnos) is found for the first time in an African Strychnos. MS, CD, 1H and 13C NMR data are also provided. [less ▲]

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See detailIsolement par écrasement de l’oreillette droite sur le cœur vivant du chien
Fredericq, Léon ULg

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Beaux-Arts (1912), (4), 184-191

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See detailL’isolement social chez les personnes de 65 ans et plus en Belgique : sa prévalence et ses déterminants
Maggi, Patrick ULg; Delye, Samuel ULg; Vermeulen, Bram et al

in Observatoire : Revue d'Action Sociale & Médico-Sociale (2013)

L’isolement social en Belgique touche aujourd’hui 23% des 65 ans et plus. Ce phénomène, contrairement à certaines croyances, ne semble pas s’aggraver, mais le vieillissement rapide de notre population ... [more ▼]

L’isolement social en Belgique touche aujourd’hui 23% des 65 ans et plus. Ce phénomène, contrairement à certaines croyances, ne semble pas s’aggraver, mais le vieillissement rapide de notre population laisse présager une augmentation de la prévalence des personnes âgées isolées dans les années à venir. Cet article vise à établir la prévalence de l’isolement social en Belgique en 2011, identifier ses déterminants et analyser l’évolution temporelle de la solitude, la forme subjective de l’isolement social. [less ▲]

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See detailThe isomerization and fragmentation of the CHO2+ ions: an example of spin-controlled chemistry?
Petitjean, Serge; Dehareng, Dominique ULg; Praet, Marie-Thérèse et al

in Advances in Mass Spectrometry (1985), X(B), 1129-1130

The article presents a study of the isomerization and fragmentation of the CHO2+ ions

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See detailThe isomerization of oxirane. Stable .CH2OCH2., .CH2CH2O. and :CHOCH3 and Their Counterpart Ions
Wesdemiotis, Chrysostomos; Leyh, Bernard ULg; Fura, Aberra et al

in Journal of the American Chemical Society (1990), 112

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See detailISON (C/2012 S1)
Manfroid, Jean ULg

Article for general public (2013)

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See detailIsoperimetric geometry
Bogaert, Jan ULg

Learning material (2003)

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See detailIsoprene and monoterpene emissions from a mixed temperate forest
Laffineur, Quentin ULg; Aubinet, Marc ULg; Schoon, N. et al

in Atmospheric Environment (2011), 45

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See detailIsoprene and monoterpene emissions from a mixed temperate forest
Laffineur, Quentin ULg; Heinesch, Bernard ULg; Amelynck, Crist et al

Poster (2011, April 07)

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See detailIsoprene-assisted radical coupling of (co)polymers prepared by cobalt-mediated radical polymerization
Debuigne, Antoine ULg; Jérôme, Christine ULg; Detrembleur, Christophe ULg

in Angewandte Chemie (International ed. in English) (2009), 48(8), 1422-1424

The isoprene-assisted radical coupling (I-ARC) of polymers prepared by cobalt-mediated radical polymerization (see picture) is the first efficient radical coupling method that is not restricted to short ... [more ▼]

The isoprene-assisted radical coupling (I-ARC) of polymers prepared by cobalt-mediated radical polymerization (see picture) is the first efficient radical coupling method that is not restricted to short chains. When applied to AB diblock copolymers, I-ARC constitutes a straightforward approach to the preparation of novel symmetrical ABA triblock copolymers [less ▲]

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See detailIsoprenoid metabolism in aphid : A new target for bioinsecticides development
Vandermoten, Sophie ULg; Charloteaux, Benoît ULg; Santini, Sébastien et al

Poster (2008, July)

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See detailIsoproturon as a model to illustrate the ELISA method for the detection and quantitation of pesticides in environment
Liegeois, Eric; Dehon, Yves; De Brabant, Bernard et al

in Proceedings of the International Symposium Environmental Biotechnology (1991, April)

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See detailIsopyoverdin Pp BTP1, a biogenetically interesting novel siderophore from Pseudomonas putida
Jacques, Philippe; Gwose, Inga; Seinsche, Dieter et al

in Natural Product Letters (1993), 3

From the cultures of Pseudomonas putida BTP 1 a siderophore could be isolated which contains the chromophore 2a rather than 1a typical for pyoverdins. Its structure was elucidated by MS, NHR and chemical ... [more ▼]

From the cultures of Pseudomonas putida BTP 1 a siderophore could be isolated which contains the chromophore 2a rather than 1a typical for pyoverdins. Its structure was elucidated by MS, NHR and chemical degradation. This new structural type is of great interest. The currently accepted biogenetic pathway leading to 1a starts from D-Tyr and L-Dab which condense to give the ferribactin chromophore 4. Subsequent ring closure via the -nitrogen of Dab leads to 1a while alternative ring closure via the -nitrogen would yield 2a. It is for the first time that this iso-chromophore has been detected in a Pseudomonas siderophore. Its discovery confirms the assumed intermediacy of ferribactine in the biogenesis of pyoverdins. [less ▲]

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See detailIsostables, isochrons, and Koopman spectrum for the action-angle representation of stable fixed point dynamics
Mauroy, Alexandre ULg; Mezić, Igor; Moehlis, Jeff

in Physica D: Nonlinear Phenomena (2013), 261

For asymptotically periodic systems, a powerful (phase) reduction of the dynamics is obtained by computing the so-called isochrons, i.e. the sets of points that converge toward the same trajectory on the ... [more ▼]

For asymptotically periodic systems, a powerful (phase) reduction of the dynamics is obtained by computing the so-called isochrons, i.e. the sets of points that converge toward the same trajectory on the limit cycle. Motivated by the analysis of excitable systems, a similar reduction has been attempted for non-periodic systems admitting a stable fixed point. In this case, the isochrons can still be defined but they do not capture the asymptotic behavior of the trajectories. Instead, the sets of interest - that we call " isostables" - are defined in the literature as the sets of points that converge toward the same trajectory on a stable slow manifold of the fixed point. However, it turns out that this definition of the isostables holds only for systems with slow-fast dynamics. Also, efficient methods for computing the isostables are missing. The present paper provides a general framework for the definition and the computation of the isostables of stable fixed points, which is based on the spectral properties of the so-called Koopman operator. More precisely, the isostables are defined as the level sets of a particular eigenfunction of the Koopman operator. Through this approach, the isostables are unique and well-defined objects related to the asymptotic properties of the system. Also, the framework reveals that the isostables and the isochrons are two different but complementary notions which define a set of action-angle coordinates for the dynamics. In addition, an efficient algorithm for computing the isostables is obtained, which relies on the evaluation of Laplace averages along the trajectories. The method is illustrated with the excitable FitzHugh-Nagumo model and with the Lorenz model. Finally, we discuss how these methods based on the Koopman operator framework relate to the global linearization of the system and to the derivation of special Lyapunov functions. © 2013 Elsevier B.V. All rights reserved. [less ▲]

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See detailIsostrychnopentamine, an indolomonoterpenic alkaloid from Strychnos usambarensis, induces cell cycle arrest and apoptosis in human colon cancer cells
Frederich, Michel ULg; Bentires-Alj, M.; Tits, Monique ULg et al

in Journal of Pharmacology and Experimental Therapeutics (2003), 304(3), 1103-1110

Isostrychnopentamine (ISP) is an indolomonoterpenic alkaloid that is present in the leaves of Strychnos usambarensis, a well known African shrub or little tree. The roots contain quaternary alkaloids ... [more ▼]

Isostrychnopentamine (ISP) is an indolomonoterpenic alkaloid that is present in the leaves of Strychnos usambarensis, a well known African shrub or little tree. The roots contain quaternary alkaloids, which are used to make a curare-like arrow poison. However, tertiary alkaloids isolated from the same plant possess cytotoxic activities against mammalian cells and protozoa. The effect of ISP has been investigated on the growth and viability of HCT-116 colon cancer cells during their exponentially growing phase. ISP induced apoptotic cell death as shown by the translocation of phosphatidylserine from the inner layer to the outer layer of the plasma membrane, chromatin condensation, DNA fragmentation, and caspase-3 and -9 activation. ISP provoked also cell cycle arrest in the G(2)-M phase. We also showed that the expression of p53 was not modified in ISP-treated cells, but that p21 was induced in a p53-independent manner. Finally, we demonstrated that ISP did not affect the catalytic activity of human topoisomerases I and II. In conclusion, ISP, which promotes cell death by a p53-independent apoptotic pathway, could be an interesting lead for cancer chemotherapy. [less ▲]

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