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See detailAnalysis of kinetic energy release distributions by the maximum entropy method.
Leyh, Bernard ULg; Gridelet, E.; Locht, Robert ULg et al

in International Journal of Mass Spectrometry (2006), 249-250

Energy is not always fully randomized in an activated molecule because of the existence of dynamical constraints. An analysis of kinetic energy release distributions (KERDs) of dissociation fragments by ... [more ▼]

Energy is not always fully randomized in an activated molecule because of the existence of dynamical constraints. An analysis of kinetic energy release distributions (KERDs) of dissociation fragments by the maximum entropy method (MEM) provides information on the efficiency of the energy flow between the reaction coordinate and the remaining degrees of freedom during the fragmentation. For example, for barrierless cleavages, large translational energy releases are disfavoured while energy channeling into the rotational and vibrational degrees of freedom of the pair of fragments is increased with respect to a purely statistical partitioning. Hydrogen atom loss reactions provide an exception to this propensity rule. An ergodicity index, F, can be derived. It represents an upper bound to the ratio between two volumes of phase space: that effectively explored during the reaction and that in principle available at the internal energy E. The function F(E) has been found to initially decrease and to level off at high internal energies. For an atom loss reaction, the orbiting transition state version of phase space theory (OTST) is especially valid for low internal energies, low total angular momentum, large reduced mass of the pair of fragments, large rotational constant of the fragment ion, and large polarizability of the released atom. For barrierless dissociations, the major constraint that results from conservation of angular momentum is a propensity to confine the translational motion to a two-dimensional space. For high rotational quantum numbers, the influence of conservation of angular momentum cannot be separated from effects resulting from the curvature of the reaction path. The nonlinear relationship between the average translational energy <epsilon > and the internal energy E is determined by the density of vibrational-rotational states of the pair of fragments and also by non-statistical effects related to the incompleteness of phase space exploration. The MEM analysis of experimental KERDs suggests that many simple reactions can be described by the reaction path Hamiltonian (RPH) model and provides a criterion for the validity of this method. Chemically oriented problems can also be solved by this approach. A few examples are discussed: determination of branching ratios between competitive channels, reactions involving a reverse activation barrier, nonadiabatic mechanisms, and isolated state decay. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailRodents biodiversity and associated infections in Southeast Asia
Hugot, Jean Pierre; Suputtamongkol, Yupin; Jittapalapong, Sathaporn et al

in Genetics in Infectious Diseases (2006), 8(4), 19

We are currently involved in a Franco-Thai program devolved to a multidisciplinary investigation of Muridae rodents (‘‘mice and rats''), their parasites and the pathogens that they may carry and/or ... [more ▼]

We are currently involved in a Franco-Thai program devolved to a multidisciplinary investigation of Muridae rodents (‘‘mice and rats''), their parasites and the pathogens that they may carry and/or transmit to human, with a better understanding of diseases emergence as an ultimate goal. In such a context, pathogens circulation in the wild is a complex but pivotal phenomenon which requires a continuum of scientific approaches to be accurately apprehended. In particular, a rigorously comparative study is mandatory in order to take into account the interactions between parasites, wild and domestic hosts (uncluding human) and their environment. This is the reason why we rely on both concepts and techniques from a wide range of disciplines including taxonomy, cytogenetics, phylogenetics, phylogeography, population genetics, ecology, geography as well as modeling. With the following objectives. Objective 1: To precisely identify and characterize the rodent species acting as reservoirs, and to document their ecology, geographic distribution as well as the genetic structure of their populations. To assess parasite and pathogen diversity in relation to their associated rodent hosts. To provide cophylogenies and co-phylogeographies in order to enlight the evolutionary relationships of hosts and parasites. Objective 2: To map and correlate the observed rodents distributions with their species-specific environmental landscapes in order to extrapolate their potential ‘‘real'' range and to anticipate their future distributions in relation to landscape modifications. Objective 3: Computing epidemiological databases. Crosschecking field data and GIS data. Definition and standardization of a risk-scale. Finalization of maps of risks and distributions. Atlas of Thai Muridae. Reference collection of Thai Muridae. Education and training of students. Following the listing of the objectives, we expose the first results of our studies and we sketch future projects. [less ▲]

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See detailHet recht op aftrek ratione temporis bis
Peeters, Bart ULg

in Tijdschrift voor Fiscaal Recht (2006)

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See detailIdentification of accessible proteins expressed in human breast cancer
Castronovo, Vincenzo ULg; Kischel, Philippe; Guillonneau, François et al

Scientific conference (2006)

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See detailMAXIMIZATION OF PULL-IN VOLTAGE OF MICRO-ELECTROMECHANICAL STRUCTURES USING TOPOLOGY OPTIMIZATION
Lemaire, Etienne ULg; Rochus, Véronique ULg; Fleury, Claude ULg et al

Conference (2006)

The design problem consists in maximizing the pull-in voltage using topology optimization method, which is formulated as an optimal material distribution. In addition to the classical volume constraint ... [more ▼]

The design problem consists in maximizing the pull-in voltage using topology optimization method, which is formulated as an optimal material distribution. In addition to the classical volume constraint, different structural constraints could be taken into consideration. Sensitivity analysis is one of the key issues of the optimization process and is performed with the formulation of eigenvalue topology optimization problems. Here the paper investigates topology optimization of strongly coupled electromechanical systems. To avoid important modifications of the electric field by the optimization process, this first study considers a non design electrode and use topology optimization to design an optimal suspension structure. Solution procedure of the optimization problem is based on CONLIN optimizer using a sequential convex programming. This method that has proved its efficiency in many structural problems (sizing, shape) is here tailored to strongly coupled multiphysics design problems under consideration. The choice of appropriate explicit convex approximations schemes for multiphysic problems is investigated. The proposed method is illustrated and validated on microbeam optimization applications. [less ▲]

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See detailRole of lipopeptides in the biological control activity of Bacillus subtilis
Ongena, Marc ULg; Jourdan, E.; Adam, A. et al

Conference (2006)

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See detailL’image dans le texte ou le texte dans l’image ? : Le cas de l’Égypte ancienne
Winand, Jean ULg

in Visible (2006), 2(2), 141-158

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See detailThree dimensional sediment transport model of the Belgian coastal zone: application of the CART theory
Mercier, Christophe ULg; Delhez, Eric ULg

Conference (2006)

Suspended sediment processes in the Belgian coastal zone are discussed by presenting the first results given by a 3D coupled hydrodynamic-sediment transport model covering the Southern Bight in North Sea ... [more ▼]

Suspended sediment processes in the Belgian coastal zone are discussed by presenting the first results given by a 3D coupled hydrodynamic-sediment transport model covering the Southern Bight in North Sea. The hydrodynamic sub-model is three-dimensional, baroclinic and includes a refined turbulence closure. In the sediment transport sub-model, the dynamic of sediments is described by an evolution equation of the sediment concentration in the water column and an equation for the sediment load on the seabed. Sedimentation is modeled through the addition of a sedimentation velocity in the vertical advection term. For the evaluation of deposition and erosion terms, formu- lae based on the calculation of the bottom stress under the combined effect of prevailing currents and waves are used. For more realism, sediment loads has also been split into different sediment classes with different sedimentation, deposition and erosion characteristics. The equations are solved by a finite volume method based on an Arakawa C grid, using sigma-transform and mode-splitting numerical methods. The horizontal resolution is 500x500 m and 10 vertical sigma-layers are used. Advection is handled using a TVD scheme with superbee flux limiter. Boundary conditions are provided by coupling this model to a 3D coupled hydrodynamic-sediment transport model of the North-Western European Continental Shelf. The results are validated with measurements carried out by Haecon NV and are compared with those obtained with the MU-STM model. A sensitivity analysis of the model to critical parameters of erosion, deposition and sedimentation based on the concept of residence time was carried out. [less ▲]

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See detailInfluence de la protection fongicide, de la variete et de la date de semis sur les caracteristiques et les proprietes de l'amidon de ble.
Bodson, Bernard ULg; Massaux, Christine; Lenartz, Jonathan et al

in 8eme Conference Internationale sur les Maladies des Plantes, Tours,France, 5 et 6 Decembre, 2006 (2006)

Starch characteristics and properties of wheat grains are slightly influenced by fungicide protection application on the crop but are mainly linked to the variety and date of sowing.

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See detailQuantitative analysis of atmosphere by laser—induced breakdown spectroscopy
Yu, Liangying; Lu, Jidong; Chen, Wen et al

in Journal of Applied Optics (2006), 27(2), 147-151

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy, plasmas were produced by a Q—switched Nd :YAG laser interacted with the air at atmospheric ... [more ▼]

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy, plasmas were produced by a Q—switched Nd :YAG laser interacted with the air at atmospheric pressure,then the light of plasmas entered the monochrom eter and transferred into an electric signal,and the spectra of these plasmas in the range of 600~ 800 nm were stored and analyzed by the calibration—free mode1.Under the condition of delay time of 8 s and gating pulse of 0.4 s,the temperature of plasmas,which was in local thermal equilibrium (LTE),was 1.62× 10 K which was obtained by means of the two—dimensional Boltzmann plane.The 20.75 oxygen content and 79.25%nitrogen content in air were detected on the assum ption that there were only oxygen and nitrogen constituents in the air.The results coincide well with the fact.The feasibility was validated by the experiment,and it built a strong basis for the further study and experiment of air pollutant monitoring. [less ▲]

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See detailIncomplete muscle strength recovery in injured professional football players
Croisier, Jean-Louis ULg; Ganteaume, S.; Genty, M. et al

in Abstract book du 11th Annual Congress of the European College of Sports Science (ECSSA) (2006)

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See detailAssessment of plasma profile of pregnancy-associated glycoprotein (PAG) in sheep with a heterologous (anti-caPAG(55+59)) RIA diagnosing and its potential for pregnancy
Ledezma-Torres, R. A.; Beckers, Jean-François ULg; Holtz, W.

in Theriogenology (2006), 66(4), 906-912

The purpose of the present investigation was to generate pregnancy associated glycoprotein (PAG)-profiles throughout pregnancy in a heterogenous sample of sheep using a radioimmunoassay with a ... [more ▼]

The purpose of the present investigation was to generate pregnancy associated glycoprotein (PAG)-profiles throughout pregnancy in a heterogenous sample of sheep using a radioimmunoassay with a heterologous antibody (anti-caPAG55,59, #708) and utilize them for the purpose of pregnancy detection. From 2 weeks after the introduction of males into the breeding herd until 4 weeks after parturition, weekly blood samples were collected from 66 pregnant and 25 non-pregnant ewes of various breeds. Between 3 and 5 weeks after conception, plasma PAG levels increased, remained almost stable until week 17, then continued to increase, culminating in a drastic surge during the last 2 weeks of pregnancy. By 4 weeks of gestation, the plasma PAG level exceeded the level typical for non-pregnant ewes by five standard deviations, permitting a reliable pregnancy diagnosis. Plasma PAG levels were higher in twin-bearing ewes than in ewes carrying a single lamb, differences getting more evident as pregnancy proceeded. Neither breed and parity of the mother nor sex and weight of lambs home exerted a significant effect. The heterologous assay system utilizing a caprine antibody proved to deliver results that are more consistent and less depending on various variables than those used in other studies. It may be concluded that, at the present state of development, the assay provides a reliable means of diagnosing pregnancy in sheep from the 4th week after they have been bred onward. (c) 2006 Elsevier Inc. All rights reserved. [less ▲]

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See detailAchromatic optical vortex coronagraph with subwavelength gratings
Mawet, Dimitri ULg; Riaud, Pierre ULg; Baudrand, J. et al

in Proceedings of the Coronagraph Workshop (2006)

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See detailEtude de l'appareil producteur de sons d'Ophidion barbatum
Fontenelle, Nicolas; Henrist, Catherine ULg; Cloots, Rudi ULg et al

Poster (2006)

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See detailInternet-Exploration: Zu den Chancen, die eine Online-Erhebung regional gefärbter Alltagssprache bietet
Elspaß, Stephan; Möller, Robert ULg

in Osnabrücker Beiträge zur Sprachtheorie (2006), 71

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See detailStrategy for the qualitative and quantitative analysis of crop syrup containing enzymatically produced Isomaltooligosaccharides known as emerging prebiotics.
Goffin, Dorothée ULg; Blecker, Christophe ULg; Wathelet, Bernard ULg et al

Poster (2006)

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human ... [more ▼]

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human subjects, support the involvement of dietary oligosaccharides in physiological processes in the different intestinal cell type and also outside the gastrointestinal tract (e.g. hormone production, lipid and carbohydrate metabolism). IMOs consists of glucose monomers linked by at least one α-1-6, or in a lower proportion α -1-3 (nigerose family) or α -1-2 (kojibiose family) glucosidic linkages. In our case they are produced enzymatically from corn starch. It results in a very complex mixture with molecules characterized at the same time by their DP value (from 2 to ~20), linkages types (α-1-2, 3 or 6) and the proportion and position of each type of linkage (only α -1-6 or combined types). The challenge of this study was to find a qualitative and quantitative method to characterize the syrups. In a subsequent study, every unidentified peak could be determined by NMR or Mass spectrometry. Three different chromatographic methods have been tested and compared over their selectivity, sensibility, robustness, applicability and their quantitative power. The HPLC-RID (Refractive Index Detector) used with a Prevail Carbohydrate column (Alltech), adapted for carbohydrates with a certain value of DP, appear to be poorly selective due to the obligation of working in isocratic conditions. The HPLC-ELSD (Evaporating Light Scattering Detector) used with the same column gave a very good separation upon the DP as the Prevail accepts a wide range of solvant changing and even a separation of the different DP 2 molecules. The sensibility was also improved due to the stability of the baseline. The quantitative analysis is a bit more awkward due to the relatively limited linear portion of the calibration curve. High-performance Anion Exchange Chromatography coupled with Pulsed Amperometric Detection (HPAEC-PAD) appeared to deserve a special mention, since it provides selective separation and sensitive detection. In fact, this technique is the only chromatographic one to separate with effectiveness homologue molecules having a difference only in their DP (up to high DPs) or linkage types. This is due to the separation mode based on the difference in ionic force of the sugars in alkaline conditions (mainly due to the DP and the structure of the molecule). However, during the detection, the electrochemical behavior of carbohydrates can be affected by molecular weight as well as by structural differences giving rise to different response factors; as a consequence, HPAEC-PAD is not generally considered as suitable for quantitative studies of complex mixtures of oligosaccharides. In this work a methodological approach is presented in order to get a quantitative response through a rigorous methodology for our IMOs. It also opens the way to the theoretical determination of the response factor for the homologue molecules in relation with their structure and DP. [less ▲]

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See detailDevelopment of real time PCR for quantification of Erwinia spp infecting potato tubers in Belgium
Moh, A.; Massart, Sébastien ULg; Roussel, S. et al

Poster (2006)

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See detailA baroclinic, regional West Florida Shelf model nested in a 1/12 degree North Atlantic HYCOM model, inclusive of tides
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Weisberg, R. H.

Conference (2006)

A West Florida Shelf (WFS) model based on the Regional Ocean Model System (ROMS) is nested in the 1/12° North Atlantic Hybrid Coordinate Ocean Model (NAT HYCOM). The nesting procedure is based on a flow ... [more ▼]

A West Florida Shelf (WFS) model based on the Regional Ocean Model System (ROMS) is nested in the 1/12° North Atlantic Hybrid Coordinate Ocean Model (NAT HYCOM). The nesting procedure is based on a flow relaxation scheme, and the model implementation is tested against in situ data over a one-year hindcast simulation. While the focus of NAT HYCOM is the large-scale circulation, the aim of this study is to show that the NAT HYCOM results can be improved by nesting a regional model with increased resolution. Results are compared qualitatively to sea surface height and quantitatively to in situ temperature and velocity measurements on the shelf. The nesting of a regional model improves the performance on the shelf. The inclusion of tides is a new addition, and preliminary results are shown. [less ▲]

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