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See detailEvolution of early eukaryotes in Precambrian oceans
Javaux, Emmanuelle ULg

in Gargaud, M.; Lopez-Gracia, P.; Martin, H. (Eds.) Origins and Evolution of Life: an astrobiological perspective (2011)

Detailed reference viewed: 68 (7 ULg)
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See detailThe evolution of errors and violation descriptions in French Air Force accident reports : the impact of human factors education
Aslanides, Michèle; Valot, Claude; Nyssen, Anne-Sophie ULg et al

in Human Factors And Aerospace Safety (2007), 6(1), 51-70

Detailed reference viewed: 60 (6 ULg)
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See detailEvolution of food design: from recipe to formulation concept
Blecker, Christophe ULg

Conference (2009, July)

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See detailEvolution of galaxies - Astronomical observations -- I. Appenzeller et al.
Manfroid, Jean ULg

in Ciel et Terre (1990), 106

Not Available

Detailed reference viewed: 1 (0 ULg)
See detailEvolution of Harmonia axyridis (Pallas) alkaloid protection during the year
Fischer, Christophe ULg; Sibret, Virginie; Laurent, Pascal ULg et al

Poster (2010, May 05)

Detailed reference viewed: 49 (12 ULg)
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See detailThe evolution of inorganic chlorine above the Jungfraujoch station: an update.
Mahieu, Emmanuel ULg; Duchatelet, Pierre ULg; Zander, Rodolphe ULg et al

in Zerefos, C. S. (Ed.) Proceedings of the 20th Quadrennial Ozone Symposium (2004)

Within the frame of the NDSC, the total vertical column abundances of HCl and ClONO2, by far the two most important inorganic chlorine reservoirs at northern mid-latitudes, have been further monitored ... [more ▼]

Within the frame of the NDSC, the total vertical column abundances of HCl and ClONO2, by far the two most important inorganic chlorine reservoirs at northern mid-latitudes, have been further monitored above the Jungfraujoch station (Swiss Alps, 46.5ºN, 8.0ºE, 3580m a.s.l.), by analyzing infrared solar absorption spectra recorded with very high-resolution Fourier spectrometers. The mean temporal evolution of the sum of their monthly mean abundance time series indicates that the total stratospheric inorganic chlorine loading (Cly) has decreased slowly (-0.7+/-0.3%/yr, 1-sigma) since it peaked in late 1996, at the limit of being statistically significant at the 2-sigma level. Comparison with model calculations and with the evolution of surface total organic chlorine will also be discussed. [less ▲]

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See detail- Evolution of lipoxygenase activity during storage of potato tubers (Solanum tuberosum L. cv. Bintje)
Fauconnier, Marie-Laure ULg; Koto, N.; Hoyaux, P. et al

in Bulletin de la Société des Sciences de Liège (1999), 68(5-6), 319

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See detailEvolution of livelihood strategy and income of the households in the coastal sandy area of the Central region, Vietnam : the case of Thua Thien Hue Province during period 2003-2008
Nguyen Dang, Hao; Lebailly, Philippe ULg

Conference (2011)

Based on livelihood approach and using both livelihood strategy participatory assessment and household survey data this study mainly focus on assessment of evolution of livelihood strategy and income of ... [more ▼]

Based on livelihood approach and using both livelihood strategy participatory assessment and household survey data this study mainly focus on assessment of evolution of livelihood strategy and income of households in the Coastal Sandy Zone of Thua Thien Hue Province. Findings indicated that livelihood strategies are very dynamic and considerable difference between the wealth categories of households and among the study sites. Although agriculture –based strategy is one of the most popular among the livelihood strategies there are considerable changes. Thanks to more specialization on livestock - non-farm business – aquaculture the better-off category has increased rapidly their income during 2003-2008 period. By contrast, due to more dependence on food crop, wage work and migration, income of the poor slowly improved at the same period. These findings implicate that in the context of rural development, support policies introduced by government have positively influenced on household income, but these general policies cannot meet the development needs from various locations as well as different household categories because there is marked difference in livelihood assets, human source, landholding, financial and social capitals in particular. [less ▲]

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See detailEvolution of livelihood strategy and income of the households in the Coastal Sandy Area of Thua Thien Hue Province during the 2003-2008 period
Nguyen Dang, Hao; Lebailly, Philippe ULg; Pham Khanh, Tu

in Improving food crop productivity in the coastal sandy area of the Thua Thien Hue Province Central Vietnam : Vietnam-Belgium interuniversity project 2004-2009 (2009)

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See detailThe evolution of magnetic fields in early B-type stars
Hubrig, S.; Briquet, Maryline ULg; Scholler, M. et al

in Revista Mexicana de Astronomia y Astrofisica Conference Series (2009, August 01)

To date, only a small number of O and early B-type stars have been investigated for magnetic fields, and as a result, only about a dozen magnetic early B-type stars and only few magnetic O stars are known ... [more ▼]

To date, only a small number of O and early B-type stars have been investigated for magnetic fields, and as a result, only about a dozen magnetic early B-type stars and only few magnetic O stars are known. The lack of information on the existence, origin and role of magnetic fields in massive stars is especially disturbing because magnetic fields may have paramount influence on the stellar evolution of high-mass stars. Our study focuses on the magnetic fields in early B-type stars with a stronger emphasis on beta Cep and SPB stars. Weak longitudinal magnetic fields (up to Ë 300 G) have been recently detected using FORS 1 in a few beta Cep and SPB stars, proving that these types of massive B-type stars can no longer be considered as non-magnetic. [less ▲]

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See detailEvolution of mechanical properties and final textural properties of resorcinol-formaldehyde xerogels during ambient air drying
Léonard, Angélique ULg; Blacher, Silvia ULg; Crine, Michel ULg et al

in Journal of Non-Crystalline Solids (2008), 354(10-11), 831-838

Porous carbon xerogels can be obtained by convective drying of resorcinol (R)-formaldehyde (F) hydrogels, followed by pyrolysis. Drying conditions have to be carefully controlled when crack-free monoliths ... [more ▼]

Porous carbon xerogels can be obtained by convective drying of resorcinol (R)-formaldehyde (F) hydrogels, followed by pyrolysis. Drying conditions have to be carefully controlled when crack-free monoliths with well-defined shape and size are required. The knowledge of the mechanical properties of the RF xerogels and their evolution with water content is essential to model their thermo-hygro-mechanical behavior during convective drying and avoid mechanical stresses leading to deformation and cracking of the sample. The shrinkage behavior and the mechanical properties of RF xerogels obtained with R/C ratio ranging from 300 to 1500 were investigated. R/C greatly influences the shrinkage and mechanical properties of the wet gel, on the one hand, and the mechanical and textural properties of the dried gel, on the other hand. The smaller the R/C, the higher the shrinkage, the stiffening, and the viscoelastic character of the xerogels. Water content has an influence on both the stiffness of the gels and the viscoelastic response. Generally, samples lose their mechanical viscous character and become more rigid when they are dried. Finally., mercury porosimetry measurements showed that the gels exhibit a marked lowering of their stiffness upon compression, interpreted as a result of the heterogeneity of the microstructure. (C) 2007 Elsevier B.V. All rights reserved. [less ▲]

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See detailEvolution of Metal Hyperaccumulation in Arabidopsis halleri
Hanikenne, Marc ULg; Kroymann, Juergen; Bernal, Maria et al

Conference (2012, February 06)

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See detailEvolution of metal hyperaccumulation in Arabidopsis halleri
Hanikenne, Marc ULg; Kroymann, Juergen; Talke, Ina N. et al

Conference (2009, March 04)

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See detailEvolution of metal hyperaccumulation required cis-regulatory changes and triplication of HMA4
Hanikenne, Marc ULg; Talke, Ina N.; Haydon, Michael J. et al

in Nature (2008), 453

Little is known about the types of mutations underlying the evolution of species-specific traits. The metal hyperaccumulator Arabidopsis halleri has the rare ability to colonize heavy-metal-polluted soils ... [more ▼]

Little is known about the types of mutations underlying the evolution of species-specific traits. The metal hyperaccumulator Arabidopsis halleri has the rare ability to colonize heavy-metal-polluted soils, and, as an extremophile sister species of Arabidopsis thaliana, it is a powerful model for research on adaptation. A. halleri naturally accumulates and tolerates leaf concentrations as high as 2.2% zinc and 0.28% cadmium in dry biomass. On the basis of transcriptomics studies, metal hyperaccumulation in A. halleri has been associated with more than 30 candidate genes that are expressed at higher levels in A. halleri than in A. thaliana. Some of these genes have been genetically mapped to broad chromosomal segments of between 4 and 24 cM co-segregating with Zn and Cd hypertolerance. However, the in planta loss-of-function approaches required to demonstrate the contribution of a given candidate gene to metal hyperaccumulation or hypertolerance have not been pursued to date. Using RNA interference to downregulate HMA4 (HEAVY METAL ATPASE 4) expression, we show here that Zn hyperaccumulation and full hypertolerance to Cd and Zn in A. halleri depend on the metal pump HMA4. Contrary to a postulated global trans regulatory factor governing high expression of numerous metal hyperaccumulation genes, we demonstrate that enhanced expression of HMA4 in A. halleri is attributable to a combination of modified cis-regulatory sequences and copy number expansion, in comparison to A. thaliana. Transfer of an A. halleri HMA4 gene to A. thaliana recapitulates Zn partitioning into xylem vessels and the constitutive transcriptional upregulation of Zn deficiency response genes characteristic of Zn hyperaccumulators. Our results demonstrate the importance of cis-regulatory mutations and gene copy number expansion in the evolution of a complex naturally selected extreme trait. The elucidation of a natural strategy for metal hyperaccumulation enables the rational design of technologies for the clean-up of metal-contaminated soils and for bio-fortification. [less ▲]

Detailed reference viewed: 177 (44 ULg)