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See detailMetal Forming Processes Optimization Using Inverse Problems
KLEINERMANN, J. P.; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg

in Proceedings of ECCOMAS 2000/COMPLAS VI, European Congress on Computational Methods in Applied Sciences and Engineering (2000)

Detailed reference viewed: 12 (1 ULg)
See detailMetal homeostasis in hyperaccumulating plants and algae
Hanikenne, Marc ULg

Scientific conference (2011, February 04)

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See detailMetal homeostasis in plants: what can we learn from zinc hyperaccumulators?
Hanikenne, Marc ULg

Conference (2013, February 26)

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See detailMetal hyperaccumulation and hypertolerance: a model for plant evolutionary genomics
Hanikenne, Marc ULg; Nouet, Cécile ULg

in Current Opinion in Plant Biology (2011), 14

In the course of evolution, plants adapted to major variations in metal availability in soils and therefore represent an important source of natural diversity of metal homeostasis networks. Thus, research ... [more ▼]

In the course of evolution, plants adapted to major variations in metal availability in soils and therefore represent an important source of natural diversity of metal homeostasis networks. Thus, research on plant metal homeostasis can provide insights into the functioning, regulation and adaptations of biological networks. Here, we describe major breakthroughs in our understanding of the genetic and molecular basis of metal hyperaccumulation and associated hypertolerance, a naturally selected complex trait which represents an extreme adaptation of the metal homeostasis network. Investigations in this field reveal further the molecular alterations underlying the evolution of natural phenotypic diversity and provide a highly relevant framework for comparative genomics. [less ▲]

Detailed reference viewed: 44 (3 ULg)
See detailMetal hyperaccumulation in Arabidopsis halleri: How is Zinc accumulating in the leaves?
Hanikenne, Marc ULg

Scientific conference (2008, October 21)

Detailed reference viewed: 10 (2 ULg)
See detailMetal hyperaccumulation in Arabidopsis halleri: How is Zinc accumulating in the leaves?
Hanikenne, Marc ULg

Scientific conference (2008, June 23)

Detailed reference viewed: 2 (1 ULg)
See detailMetal hyperaccumulation in Arabidopsis halleri: How is Zinc accumulating in the leaves?
Hanikenne, Marc ULg

Scientific conference (2010, September 17)

Detailed reference viewed: 10 (4 ULg)
See detailMetal hyperaccumulation in Arabidopsis halleri: How is Zinc accumulating in the leaves?
Hanikenne, Marc ULg

Scientific conference (2009, October 02)

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See detailMetal Ion Binding and Coordination Geometry for Wild Type and Mutants of Metallo-Beta -Lactamase from Bacillus Cereus 569/H/9 (Bcii): A Combined Thermodynamic, Kinetic, and Spectroscopic Approach
De Seny, Dominique ULg; Heinz, U.; Wommer, S. et al

in Journal of Biological Chemistry (2001), 276(48), 45065-78

One high affinity (nm) and one low affinity (microM) macroscopic dissociation constant for the binding of metal ions were found for the wild-type metallo-beta-lactamase from Bacillus cereus as well as six ... [more ▼]

One high affinity (nm) and one low affinity (microM) macroscopic dissociation constant for the binding of metal ions were found for the wild-type metallo-beta-lactamase from Bacillus cereus as well as six single-site mutants in which all ligands in the two metal binding sites were altered. Surprisingly, the mutations did not cause a specific alteration of the affinity of metal ions for the sole modified binding site as determined by extended x-ray absorption fine structure (EXAFS) and perturbed angular correlation of gamma-rays spectroscopy, respectively. Also UV-visible absorption spectra for the mono-cobalt enzymes clearly contain contributions from both metal sites. The observations of the very similar microscopic dissociation constants of both binding sites in contrast to the significantly differing macroscopic dissociation constants inevitably led to the conclusion that binding to the two metal sites exhibits negative cooperativity. The slow association rates for forming the binuclear enzyme determined by stopped-flow fluorescence measurements suggested that fast metal exchange between the two sites for the mononuclear enzyme hinders the binding of a second metal ion. EXAFS spectroscopy of the mono- and di-zinc wild type enzymes and two di-zinc mutants provide a definition of the metal ion environments, which is compared with the available x-ray crystallographic data. [less ▲]

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See detailMetal plastic behaviour linked to texture analysis and FEM method
Duchene, Laurent ULg; Godinas, André; Habraken, Anne ULg

in 4th International Conference NUMISHEET 1999 (1999)

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See detailMetal response of transgenic tomato plants expressing P1B-ATPase
Barabasz, Anna; Wilkowska, Anna; Ruszczyńska, Anna et al

in Physiologia Plantarum (2012), 145

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See detailMetal-coordination: an effective lever for cobalt-mediated radical polymerization
Debuigne, Antoine ULg; Jérôme, Christine ULg; Jérôme, Robert ULg et al

in Polymer Preprints (2008), 49(27), 193-194

Detailed reference viewed: 11 (3 ULg)
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See detailMetal-Forming Simulation via Eulerian-Lagrangian FEM with Contact Problems
Ponthot, Jean-Philippe ULg

in Proc. of NUMETA'90, Numerical Meth. in Engineering: Theory & Applications (1990)

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See detailMetal-free strategies for the synthesis of functional and well-defined polyphosphoesters
Clement, Benoît ULg; Grignard, Bruno ULg; Koole, Leo et al

in Macromolecules (2012), 45(11), 4476-4486

We report here metal-free strategies using organocatalysis based on supramolecular recognition for the ring-opening polymerization (ROP) of several cyclic phosphate monomers (CPMs) by a variety of ... [more ▼]

We report here metal-free strategies using organocatalysis based on supramolecular recognition for the ring-opening polymerization (ROP) of several cyclic phosphate monomers (CPMs) by a variety of organocatalysts such as 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1,5,7-triazabicyclo[4.4.0]undec-5-ene (TBD), and a bicomponent thiourea−tertiary amine catalyst. Each of these catalysts is efficient to produce linear polyphosphoesters (PPEs) from CPMs but with different sensitivity toward transesterification side reactions. The strong basicity of DBU is sufficient to activate an alcohol initiating the polymerization in the absence of any other cocatalyst. Nevertheless, side chain transfer reactions leading to branched and/or cyclic polymeric structures are observed, especially for high monomer conversion. Unlike DBU, TBD is a dual catalyst activating both the alcohol and the monomer. This dual activation allows shorter polymerization time, but SEC analyses of polyphosphates reveal bimodal molecular weight distribution due to chains coupling. Finally, a mixture of DBU and thiourea (TU) appears by far the most efficient catalyst to carry out fast and controlled polymerization while minimizing transesterification reactions, even at near-complete conversion. Compared with polymerizations carried out with Sn(Oct)2 as a metal catalyst, the control of polymerization is much better so that it is possible to prepare polyphosphoesters (PPEs) with molecular weight close to 70 000 g mol−1 and polydispersity index below 1.10. Simultaneous activation by TU of both CPMs and the alcohol group of the initiator by DBU proves to be an effective and robust ROP catalytic system to synthesize polymers with predictable molecular weight and narrow polydispersity. The chain extension experiments through the use of hydroxy end- capped PPEs as macroinitiators confirm the controlled/living nature of the DBU/TU-catalyzed ROP of CPMs and pave the way to the synthesis of block copolymers based on polyphosphates. [less ▲]

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See detailMetal-free synthesis of a glucosamine labeled amphiphilic polymer for drug delivery applications
Riva, Raphaël ULg; Boyère, Cécric; Debuigne, Antoine ULg et al

Poster (2014, May 19)

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See detailMétalangage et épistémologie
Badir, Sémir ULg

in Horizon sémiologie (2006)

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See detailMetallic nanowire networks for energy applications: experimental and modelling approaches
Langley, Daniel ULg; Lagrange, Mélanie; Munoz-Rojas, David et al

Conference (2014)

Research is increasingly being dedicated towards finding emerging materials aiming at playing a prominent role in energy issues. Transparent electrodes are a key component of devices such as solar cells ... [more ▼]

Research is increasingly being dedicated towards finding emerging materials aiming at playing a prominent role in energy issues. Transparent electrodes are a key component of devices such as solar cells or efficient lighting (such as OLED). Among emerging transparent conductive materials, metallic nanowire networks appear to be a very promising solution. This work aims at designing and optimizing metallic nanowire networks based on both experimental and modelling approaches. The influence on the networks physical properties of several key parameters such as the metal/alloy used, thermal annealing, network density, device size, etc. are explored. These percolating networks exhibit excellent properties (sheet resistances and optical transparency of about 10 Ω/ sq and 90%, respectively) fulfilling the requirements for solar or efficient opto-electronic applications. This makes them very appropriate for future uses involving large area and flexible photovoltaics or efficient lighting display technologies. A comprehensive understanding of the design and main physical properties of these promising nanostructured networks will be presented [less ▲]

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See detailThe metallicity gradient of the old halo
Parmentier, Geneviève ULg; Jehin, Emmanuel ULg; Magain, Pierre ULg et al

in Noels-Grötsch, Arlette; Magain, Pierre; Caro, Denise (Eds.) et al Liege International Astrophysical Colloquia (2000)

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See detailMetallicity Gradients in Globular Cluster Systems : the Trace of a Self-Enrichment Process ?
Parmentier, G.; Magain, Pierre ULg; Noels-Grötsch, Arlette ULg et al

in Geisler, E. K.; Grebel, E.; Minniti, D. (Eds.) Extragalactic Star Clusters (2002)

We have developed a model of globular cluster self-enrichment, based on the ability of the globular cluster gaseous progenitors to retain the ejecta of a first generation of Type II Supernovae. The key ... [more ▼]

We have developed a model of globular cluster self-enrichment, based on the ability of the globular cluster gaseous progenitors to retain the ejecta of a first generation of Type II Supernovae. The key point is that this ability depends on the pressure exerted on the progenitor cloud by the surrounding protogalactic medium and therefore on the location of the cloud in the protogalaxy. The model is able to explain the galactic halo metallicities and the metallicity gradient of the Old Halo which is thought to be the genuine galactic globular cluster system. The possibility that metallicity gradients are a common property of extragalactic globular cluster systems is also presented. [less ▲]

Detailed reference viewed: 21 (1 ULg)