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See detailCharacterization of Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) overwintering sites
Fassotte, Bérénice ULg; Durieux, Delphine ULg; Haubruge, Eric ULg et al

Poster (2012, February 10)

The invasive multicoloured Asian ladybird, Harmonia axyridis (Pallas), forms large aggregations inside dwellings to overwinter. In order to highlight the specific features of infested houses, we ... [more ▼]

The invasive multicoloured Asian ladybird, Harmonia axyridis (Pallas), forms large aggregations inside dwellings to overwinter. In order to highlight the specific features of infested houses, we investigated a large number of overwintering sites in Wallonia between 2007 and 2011. These sites were characterized through a survey sent to homeowners confronted to invasion problems. The results indicate that H. axyridis preferentially selects isolated brick houses with red or white fronts to take shelter. Aggregations are mostly located at the first floor, essentially inside south or west oriented rooms. Furthermore, ladybirds generally gathered into wooden windows frames facing south or west, and to a lesser extent, in the upper corners of walls presenting the same orientation. [less ▲]

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See detailImpact of cultivation practices on soil respiration
Dufranne, Delphine ULg; Vancutsem, Françoise ULg; Bodson, Bernard ULg et al

Poster (2012, February 10)

Cultivation practices are known to induce a modification of soil organic matter quantity, quality and spatial distribution, which may impact dry matter decomposition kinetics. In order to bring answers to ... [more ▼]

Cultivation practices are known to induce a modification of soil organic matter quantity, quality and spatial distribution, which may impact dry matter decomposition kinetics. In order to bring answers to these questions, a multidisciplinary project (SOLRESIDUS) was set up by the University of Liege, Gembloux Agro-Bio Tech in collaboration with Walloon Agricultural Research Centre (CRA-W). The aim was to investigate the impact of cultivation practices (tillage and residue restitution) on crop growth, yield and environment, as well as on soil properties and on activities. In the present study, we focused on the impacts on soil respiration soil for 3 years. We will present our first results. [less ▲]

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See detailReplacing explicit water and membrane molecules in molecular dynamics simulation to boost simulation speed
Steinhauer, Sven ULg; Crowet, Jean-Marc ULg; Lins, Laurence ULg et al

Poster (2012, February 10)

Molecular dynamics (MD) is an appropriate method for investigation of biomolecular systems and helps in explaining results from wet lab experiments or in getting further insight into details, which are ... [more ▼]

Molecular dynamics (MD) is an appropriate method for investigation of biomolecular systems and helps in explaining results from wet lab experiments or in getting further insight into details, which are not accessible by experimental methods(Lindahl, 2008). By now, many biologically relevant processes for drug design, toxicological studies and other fields of application, can not be performed by atomistic MD simulations (Lindahl, 2008). In MD, the necessary time effort for carrying out a simulation is considerable and depends mainly on (1) the complexity of the simulated system (2) the simulated time scale (3) the simulation method (4) the efficiency of used hardware and software algorithms. Carried out MD simulations nowadays may still take weeks of calculation on high end computers. In practice, biologically relevant processes, as e.g. protein folding, take usually place above the time scale of milli seconds. They can take up to the order of some thousands of seconds (in case of the folding of membrane proteins). Molecular dynamics computer simulations have reached the scale of micro seconds for simulations of systems where each atom was described and simulated over time.(Lindahl, 2008) Nevertheless, MD has risen to an important promoter methodology for many different fields of application. By replacing bunches of atoms by artificial particles, complexity of the systems can be reduced. This method is called the coarse grain method (CG). Biggin and Bond (2008) found an acceleration of their simulation processes for self assembling membrane / protein systems in water by factor 100. They estimated one to two days of calculation for a simulated time scale of 0.1 to 0.2 micro seconds for their systems. Implicit force fields like "IMPALA", aim to describe water and/or membrane molecules in simulations by a couple of simple and partially precalculable equations. “IMPALA” is a force field initially developed by our laboratory. Using this method, thousands of water and lipid molecules can be replaced, leading to a reduced complexity of the system to be simulated. "IMPALA"(Ducarme et al., 1998) based on the assumption of rigid peptides and aimed to find the insertion characteristics of such in membranes. Elimination of the necessity for simulating the aqueous and lipid phase atom by atom in the software package "Gromacs"(Berendsen et al., 1995) will permit both: a gain of speed, as it was already the case for the introduction of the coarse grain method, and a gain of precision by turning rigid molecules flexible through "Gromacs". Our current work is the integration of the "IMPALA" implicit force field into "Gromacs". Biggin, P.C. & Bond, P.J. Molecular dynamics simulations of membrane proteins. Methods Mol. Biol. 443, 147-60(2008). Berendsen, et al. (1995) Comp. Phys. Comm. 91: 43-56. Ducarme, P., Rahman, M. & Brasseur, R. IMPALA: a simple restraint field to simulate the biological membrane in molecular structure studies. Proteins 30, 357-71(1998). Lindahl, E.R. (2008). Molecular dynamics simulations. Methods Mol. Biol. 443, 3-23. [less ▲]

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See detailVolatile organic compounds released by barley roots attract wireworms
Barsics, Fanny ULg; Fiers, Marie ULg; Haubruge, Eric ULg et al

Poster (2012, February 10)

Wireworms are the soil dwelling larvae of click beetles and are pests of many crops worldwide. Alternatives to insecticide treatments are needed in order to develop integrated management strategies. Our ... [more ▼]

Wireworms are the soil dwelling larvae of click beetles and are pests of many crops worldwide. Alternatives to insecticide treatments are needed in order to develop integrated management strategies. Our work consists in elucidating the role of barley root-emitted volatile organic compounds on the orientation behaviour of Agriotes sordidus wireworms. Using a dual choice olfactometer we have evaluated the attractiveness of a variety of baits ranging from barley roots themselves to isolated root-emitted volatile organic compounds. Wireworms were significantly attracted towards most of the tested baits. Our results should be taken into account in varietal selection, in crop rotation, or in trapping systems aiming at the reduction of the populations of this pest. [less ▲]

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See detailL'architecture postmoderniste dans la tourmente de l'idéologie du progrès
Steinmetz, Rudy ULg

in André Valérie, Contzen Jean-Pierre (Ed.) L'idéologie du progrès dans la tourmente du postmodernisme (2012, February 10)

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See detailDirect imaging, photometry and spectroscopy of gravitationally lensed quasars
Ricci, Davide ULg

Doctoral thesis (2012)

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See detailDeux méthodes numériques pour la résolution de problèmes de diffraction multiple à haute fréquence
Antoine, X.; Boubendir, Y.; Geuzaine, Christophe ULg

Scientific conference (2012, February 10)

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See detailIntegration of external information into genetic evaluations by a Bayesian procedure
Vandenplas, Jérémie ULg; Gengler, Nicolas ULg

Poster (2012, February 10)

One of the most important theoretical assumptions of methods used to assess genetic values is that all available information has to be considered simultaneously to obtain unbiased estimates. However, the ... [more ▼]

One of the most important theoretical assumptions of methods used to assess genetic values is that all available information has to be considered simultaneously to obtain unbiased estimates. However, the widespread international exchange of genetic material and, more recently, the important development of the genomic selection lead to the coexistence of different genetic evaluations. Therefore, the blending of the different sources of information is necessary to achieve better prediction. Integration of external information into genetic evaluations by a Bayesian procedure can partially resolve the problem under some assumptions. Results from such a method that also avoids double counting among external animals are highly similar to those from a joint evaluation. [less ▲]

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See detailVariability among morning and evening milk compositions during the lactation
Arnould, Valérie ULg; Gengler, Nicolas ULg; Soyeurt, Hélène ULg

Poster (2012, February 10)

The main objective of this study was to analyze milking-to-milking variability of milk yield and milk composition (such as fat and protein percentages and somatic cell count). Additional objective was to ... [more ▼]

The main objective of this study was to analyze milking-to-milking variability of milk yield and milk composition (such as fat and protein percentages and somatic cell count). Additional objective was to extend this analyze to the milk fat composition. Milk samples (n=195.960) were collected from 29.636 cows in 491 Luxembourg farms and analyzed by MIR spectrometry. The milk contents of saturated, mono-, poly- and unsaturated fatty acids, and short, medium and long chain fatty acids were predicted from the recorded MIR spectral data. As expected, the milk composition and the milk fat composition, are affected by several factors as the milking period and the days in milk. In practice, using separately milk evening and milk morning could be interesting for cheese or butter production. [less ▲]

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See detailSoil Respiration in forest Ecosystems: Combination of a multilayer Approach and an Isotopic Signal Analysis
Goffin, Stéphanie ULg; Longdoz, Bernard; Maier, Martin et al

in Communications in Agricultural and Applied Biological Sciences (2012, February 10)

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See detailDéveloppement territorial et parcs d'activités économiques
Halleux, Jean-Marie ULg

Conference given outside the academic context (2012)

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See detailCarbon balance of a grazed grassland in Belgium
Jerome, Elisabeth ULg; Beckers, Yves ULg; Bodson, Bernard ULg et al

in Communications in Agricultural and Applied Biological Sciences (2012, February 10)

This work seeks to analyze the carbon balance of a managed permanent grassland grazed by the “Blanc Bleu Belge” breed of cattle. The study site is located at Dorinne. The experimental field was equipped ... [more ▼]

This work seeks to analyze the carbon balance of a managed permanent grassland grazed by the “Blanc Bleu Belge” breed of cattle. The study site is located at Dorinne. The experimental field was equipped with an eddy covariance system that measured CO2 fluxes and with a micrometeorological station. Carbon exported through mowing, imported through compost application or through complementary feeds for cattle was also measured. Carbon lost through CH4 emissions was finally estimated, allowing the establishment of a full C budget. In addition, the vegetation development was followed in order to estimate herbage production and dry matter intake by grazing animals. First year full carbon budget is presented and discussed, in relation with climate conditions and management practices. [less ▲]

Detailed reference viewed: 129 (20 ULg)