References of "2009"
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See detailThe strange case of the Of?p stars
Nazé, Yaël ULg; Walborn, N. R.; Martins, F. et al

Poster (2009)

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See detailA revised carbon budget for the North Sea
Paetsch, J.; Kuehn, W.; Borges, Alberto ULg et al

Conference (2009)

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See detailAgronomical and molecular factors influencing bananas (Musa acuminata, AAA, cv ‘Grande-Naine’) susceptibility to crown rot disease
Lassois, Ludivine ULg

Doctoral thesis (2009)

Crown rot affects export bananas in all producing countries and is considered to be one of the main export banana post-harvest disease. Variations are observed in the expression of crown rot symptoms. An ... [more ▼]

Crown rot affects export bananas in all producing countries and is considered to be one of the main export banana post-harvest disease. Variations are observed in the expression of crown rot symptoms. An original approach of the disease is proposed and consists on presenting the fruit quality potential at harvest as a key factor in crown rot development. This potential develops during growth of bananas in the field and depends on a physiological and a parasitical component. The physiological component refers here to the level of fruit susceptibility to crown rot and reflects the physiological state of the fruit. The aim of this study was to clarify the role of the fruit physiological component at harvest in the post-harvest crown rot development. It appears that the fruit physiological component at harvest greatly influence the postharvest disease development and thus the fruit susceptibility. Seasonal variations in disease severity were shown in two production area and are related to a variation of the fruit physiological component. In Guadeloupian conditions, the internal necrotic surface of the crown was nearly multiplied by 4 during 11 successive weeks. Two pre-harvest factors that could influence the fruit physiological component by modifying their susceptibility to crown rot, were identified: (i) hand position on the bunch and (ii) source-sink ratio of the banana plant (hand considered as sink and leaves as source). It was shown that within a bunch, there is a gradient of susceptibility to crown rot (r= -0.95), the hands initiated first (the upper ones) being more susceptible than those initiated last (the lower ones). These results also confirmed that source-sink ratio changes have a significant effect on fruit morphology and demonstrated that there is also an effect on fruit susceptibility to crown rot disease. When the sink is decreased by artificial removal of many hands, the level of fruit susceptibility to crown rot decreases. However, the molecular mechanisms underlying these quantitative host-pathogen relationships were still unknown. A study was designed to compare gene expression, by cDNA-AFLP, between crowns of bananas showing a high susceptibility (S+) and crowns of bananas showing a low susceptibility (S-) to Colletotrichum musae responsible for crown rot disease. This comparison was performed at two situation time: (i) between crowns (S+ and S-) collected one hour before infection and (ii) between crowns (S+ and S-) collected 13 days after infection. Genes implied in signaling pathway and proteolytic machinery were identified. It also appears that a cellulose synthase, a CAF1 gene, 2 glycolipid transfer protein and a dopamine-β-monooxygenase were differently expressed between bananas showing different levels of susceptibility. This is the first study of the characterization of the banana physiological component at harvest which influences the crown rot post-harvest disease development. In addition, to our knowledge, this work is the first to address both pre- and post-infection gene expression with the same host-pathogen combination and different susceptibility levels. [less ▲]

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See detailMagnetic and transport properties of HoMnO3 monocrystals
Radulov, Iliya; Lovchinov, Vassil; Dimitrov, Dimitar et al

in Journal of Optoelectronics and Advanced Materials [= JOAM] (2009), 11

This paper presents results from measurements of the magnetization, specific heat and dielectric constant, and their temperature and magnetic field dependence, for HoMnO3 single crystals. The results are ... [more ▼]

This paper presents results from measurements of the magnetization, specific heat and dielectric constant, and their temperature and magnetic field dependence, for HoMnO3 single crystals. The results are discussed in the framework of existing data on magnetic symmetries and the interactions between the Mn-spins, the rare earth moments, and the lattice. From the resulting data, the magnetic phase diagram of HoMnO3 was built. [less ▲]

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See detailL'application du droit de la concurrence par les juridictions belges: une analyse tendancielle de la jurisprudence récente
Petit, Nicolas ULg

in Bellis, Jean-François (Ed.) Concurrence en droit, belge et européen (2009)

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See detailLECONS D'ANALYSE NUMERIQUE - PREMIERE PARTIE
Debongnie, Jean-François ULg

Book published by DEBONGNIE (JEAN-FRANCOIS) (2009)

Version étoffée d'un cours donné par l'auteur à l'EMI (Rabat) de 1979 à 1985 (première partie)

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See detailLECONS D'ANALYSE NUMERIQUE - DEUXIEME PARTIE
Debongnie, Jean-François ULg

Book published by DEBONGNIE (JEAN-FRANCOIS) (2009)

Version étoffée d'un cours donné par l'auteur à l'EMI, Rabat, de 1979 à 1985

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See detailSubchondral bone in osteoarthritis physiopathology: state-of-the art and perspectives.
Henrotin, Yves ULg; Pesesse, Laurence ULg; Sanchez, Christelle ULg

in Bio-medical Materials & Engineering (2009), 19(4-5), 311-6

Osteoarthritis (OA) is the most common form of arthritic disease, and it is a major cause of disability and impaired quality of life in the elderly. A hallmark of the disease is progressive degeneration ... [more ▼]

Osteoarthritis (OA) is the most common form of arthritic disease, and it is a major cause of disability and impaired quality of life in the elderly. A hallmark of the disease is progressive degeneration of articular cartilage and subsequent joint space narrowing. However, OA is a complex disease not limited to cartilage degeneration, but involving also synovial membrane and subchondral bone, thereby presenting alternatives approaches for treatment. In this paper, we propose a short review of the recent advances in the understanding of the role played by subchondral bone in OA. [less ▲]

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See detailPlanning under uncertainty, ensembles of disturbance trees and kernelized discrete action spaces
Defourny, Boris ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

in Proceedings of the IEEE International Symposium on Adaptive Dynamic Programming and Reinforcement Learning (ADPRL-09) (2009)

Optimizing decisions on an ensemble of incomplete disturbance trees and aggregating their first stage decisions has been shown as a promising approach to (model-based) planning under uncertainty in large ... [more ▼]

Optimizing decisions on an ensemble of incomplete disturbance trees and aggregating their first stage decisions has been shown as a promising approach to (model-based) planning under uncertainty in large continuous action spaces and in small discrete ones. The present paper extends this approach and deals with large but highly structured action spaces, through a kernel-based aggregation scheme. The technique is applied to a test problem with a discrete action space of 6561 elements adapted from the NIPS 2005 SensorNetwork benchmark. [less ▲]

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See detailWheat root ecophysiology: understanding communication between wheat root system and soil microorganisms.
Delaplace, Pierre ULg; d'Ans, Séverine ULg; Wathelet, Jean-Paul ULg et al

Poster (2009)

Studies leading to a better understanding of the mechanisms involved in the communication between soil microorganisms and root system can potentially lead to improved fertility management strategies. Up ... [more ▼]

Studies leading to a better understanding of the mechanisms involved in the communication between soil microorganisms and root system can potentially lead to improved fertility management strategies. Up to now, the characterization of such interactions has been mainly focused on root exsudates but volatile organic compounds (VOC) also play a role as chemical messengers in positive interactions occurring in the rhizosphere. We aim to better understand the VOC-mediated chemical ecophysiology of soil. Wheat (Triticum aestivum L.) was chosen in this project based on its importance for food production and industrial applications. [less ▲]

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See detailA discontinuous Galerkin formulation of non-linear Kirchhoff–Love shells
Noels, Ludovic ULg

in International Journal for Numerical Methods in Engineering (2009), 78(3), 296-323

Discontinuous Galerkin (DG) methods provide a means of weakly enforcing the continuity of the unknown-field derivatives and have particular appeal in problems involving high-order derivatives. This ... [more ▼]

Discontinuous Galerkin (DG) methods provide a means of weakly enforcing the continuity of the unknown-field derivatives and have particular appeal in problems involving high-order derivatives. This feature has previously been successfully exploited (Comput. Methods Appl. Mech. Eng. 2008; 197:2901-2929) to develop a formulation of linear Kirchhoff-Love shells considering only the membrane and bending responses. In this proposed one-field method - the displacements are the only unknowns, while the displacement field is continuous, the continuity in the displacement derivative between two elements is weakly enforced by recourse to a DG formulation. It is the purpose of the present paper to extend this formulation to finite deformations and non-linear elastic behaviors. While the initial linear formulation was relying on the direct linear computation of the effective membrane stress and effective bending couple-stress from the displacement field at the mid-surface of the shell, the non-linear formulation considered implies the evaluation of the general stress tensor across the shell thickness, leading to a reformulation of the internal forces of the shell. Nevertheless, since the interface terms resulting from the discontinuous Galerkin method involve only the resultant couple-stress at the edges of the shells, the extension to non-linear deformations is straightforward. [less ▲]

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See detailDon Quichotte ou le triomphe de l’imperfection
Ceballos Viro, Alvaro ULg

Article for general public (2009)

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See detailInterest of Locometrix compared with others clinical tests to assess gait’s profile in some specific old populations
Gillain, Sophie ULg; Warzee, Emmanuelle ULg; Maquet, Didier ULg et al

in Journal of Nutrition, Health & Aging (The) (2009), 13(Supp 1),

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See detailVulnerability of reactive skin to electric current perception--a pilot study implicating mast cells and the lymphatic microvasculature.
Quatresooz, Pascale ULg; Franchimont, Claudine ULg; Pierard, Gérald ULg

in Journal of Cosmetic Dermatology (2009), 8(3), 186-9

BACKGROUND/OBJECTIVE: Sensitive/reactive skin is regarded as a manifestation of sensory irritation. This susceptibility condition to various exogenous factors suggests the intervention of some ... [more ▼]

BACKGROUND/OBJECTIVE: Sensitive/reactive skin is regarded as a manifestation of sensory irritation. This susceptibility condition to various exogenous factors suggests the intervention of some neuropeptides and other neurobiological mediators. Mast cells are among the putative implicated cells. METHOD: The present immunohistochemical and morphometric study was performed on two groups of 36 gender- and age-matched subjects complaining or not from reactive skin as determined by electric current perception. In the mid upper part of the dermis, the numerical density in mast cells and the size of the microvasculature were assessed distinguishing the blood and lymphatic vessels. RESULTS: Globally, the distributions of data were large in reactive skin. This condition was characterized by a prominent increase in both the numerical density in mast cells and the overall size of the lymphatics. By contrast, no difference was found in the size of cutaneous blood vessels. More precisely, it appeared that a subgroup of people with reactive skin exhibited these changes contrasting with some other individuals whose data remained close to the normal range. CONCLUSION: Mast cells and lymphatics are probably involved in the process of sensory irritation affecting a subgroup of the population. [less ▲]

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See detailThermal manipulations of broiler embryos during late incubation and their immediate and long-lasting effects
Willemsen, H.; Everaert, Nadia ULg; Tona, K. et al

Conference (2009)

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See detailDigital microfluidics on a wire
Gilet, Tristan ULg; Terwagne, Denis ULg; Vandewalle, Nicolas ULg

in Applied Physics Letters (2009), 95

In this letter, we discuss the behavior of droplets on fiber networks. An on/off transition is observed when a droplet comes around an intersection between several fibers: large droplets cross the ... [more ▼]

In this letter, we discuss the behavior of droplets on fiber networks. An on/off transition is observed when a droplet comes around an intersection between several fibers: large droplets cross the junction while small droplets remain pinned. We show that fibers perform advantageously most operations of digital microfluidics, such as multiplexed biochemical microreactions: intersections are the basic component of fiber-based microfluidic devices. [less ▲]

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See detailSub-Rayleigh quantum imaging using single-photon sources
Thiel, C.; Bastin, Thierry ULg; von Zanthier, J. et al

in Physical Review. A (2009), 80

We propose a technique capable of imaging a distinct physical object with sub-Rayleigh resolution in an ordinary far-field imaging setup using single-photon sources and linear optical tools only. We ... [more ▼]

We propose a technique capable of imaging a distinct physical object with sub-Rayleigh resolution in an ordinary far-field imaging setup using single-photon sources and linear optical tools only. We exemplify our method for the case of a rectangular aperture and two or four single-photon emitters obtaining a resolution enhanced by a factor of 2 or 4, respectively. [less ▲]

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See detailSynthesis of titanium dioxide nanoparticles by reactive DC magnetron sputtering
Dreesen, Laurent ULg; Colomer, Jean-François; Limage, Hervé et al

in Thin Solid Films (2009), 518

Nanometer-sized titanium dioxide (TiO2) particles were prepared on carbon substrates by reactive direct-current magnetron sputtering. By performing measurements with high resolution electron microscopes ... [more ▼]

Nanometer-sized titanium dioxide (TiO2) particles were prepared on carbon substrates by reactive direct-current magnetron sputtering. By performing measurements with high resolution electron microscopes, the mean nanoparticle diameter and the coverage fraction of the substrate by the nanoparticles (NPs) were measured at 19 nm and 30%, respectively. Moreover, electron diffraction analysis showed that the TiO2 NPs' crystalline structure on the carbon substrate was a mixture of anatase and rutile. Finally,we provided information on the TiO2 initial growth stage: crystalline NPs were formed after deposition of amorphous nanoparticles on the substrate and heating. [less ▲]

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