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See detailOptimization of Yarrowia lipolytica's β-oxidation pathway for γ-decalactone production
Waché, Y.; Aguedo, Mario ULg; LeDall, M.-T. et al

in Journal of Molecular Catalysis B : Enzymatic (2002), 19-20

The yeast Yarrowia lipolytica growing on methyl ricinoleate produces various lactones, γ-decalactone, the worthy aroma compound, 3-hydroxy-γ-decalactone without sensorial properties and two decenolides of ... [more ▼]

The yeast Yarrowia lipolytica growing on methyl ricinoleate produces various lactones, γ-decalactone, the worthy aroma compound, 3-hydroxy-γ-decalactone without sensorial properties and two decenolides of various interest. Unfortunately, these three latter lactones are produced at high levels by this yeast, decreasing yields and complicating the extraction of γ-decalactone. In this study, the production of γ-decalactone was increased through a genetic engineering of the strain and the accumulation of the three other lactones was lowered. Theses results show that it is possible to improve the mastering of the complex β-oxidation pathway (the metabolic pathway involved in these bioconversions) by playing on genetic factors. © 2002 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailOptimization on manifolds : methods and applications
Absil, P.-A.; Mahony, R.; Sepulchre, Rodolphe ULg

in Recent Advances in Optimization and its Applications in Engineering (2010)

Summary. This paper provides an introduction to the topic of optimization on manifolds. The approach taken uses the language of differential geometry, however, we choose to emphasise the intuition of the ... [more ▼]

Summary. This paper provides an introduction to the topic of optimization on manifolds. The approach taken uses the language of differential geometry, however, we choose to emphasise the intuition of the concepts and the structures that are important in generating practical numerical algorithms rather than the technical details of the formulation. There are a number of algorithms that can be applied to solve such problems and we discuss the steepest descent and Newton’s method in some detail as well as referencing the more important of the other approaches. There are a wide range of potential applications that we are aware of, and we briefly discuss these applications, as well as explaining one or two in more detail. [less ▲]

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See detailOptimization or Rolling and Floating Lock Gates
Rigo, Philippe ULg; Pircalabu, Eugen ULg; Amrane, Amirouche ULg et al

in PIANC'08 (2008, June)

This paper presents a methodology to minimize the weight of the gate by optimizing simultaneously the height of the floating tanks, the number of their watertight partitions and the gate scantling while ... [more ▼]

This paper presents a methodology to minimize the weight of the gate by optimizing simultaneously the height of the floating tanks, the number of their watertight partitions and the gate scantling while considering the floating stability (Richir et al. 2006) The rolling gate, considered for this lock, has to float to be led into the port for maintenance or repairing operations. Two partitioned floating tanks are used inside the gate. Water ballast can be pumped from the floating tanks to float the structure or to restore the mass equilibrium in case of damage due to boat impact. [less ▲]

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See detailOptimization software : View from Europe
Duysinx, Pierre ULg; Fleury, Claude ULg

in KAMAT, M. P. (Ed.) Structural Optimization Status and Promise (1992)

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See detailOptimization study of the Scheldt ock gate on the cross section C with LBR-5 software
Rigo, Philippe ULg; Yerna, Olivier ULg

Report (2011)

Report of the optimisation (least weight) performed on the lock gates (Port of Antwerp)

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See detailOptimization to low temperature activity in psychrophilic enzymes
Struvay, Caroline ULg; Feller, Georges ULg

in International Journal of Molecular Sciences (2012), 13(9), 11643-11665

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See detailOptimization, continuation and lack of the one-step diphosphorylation reaction. Assay of modification of the tetraethyl(pyrrolidine-2,2-diyl)bisphosphonate
Olive, Gilles ULg; Jacques, Alain

in Phosphorus, Sulfur & Silicon & the Related Elements (2003), 178(1), 33-46

The optimization of the one-step diphosphorylation reaction is reported. The synthesis of new ®-aminobisphosphonates with four- and sixmembered rings and acyclic species with several substituents on the ... [more ▼]

The optimization of the one-step diphosphorylation reaction is reported. The synthesis of new ®-aminobisphosphonates with four- and sixmembered rings and acyclic species with several substituents on the nitrogen atom and on the carbon atom bearing the two phosphorus atoms is described. [less ▲]

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See detailOPTIMIZATION: Proceedings of the 9th Belgian-French-German Conference on Optimization, Namur, September 7-11, 1998
Nguyen, Van Hien; Strodiot, Jean-Jacques; Tossings, Patricia ULg

Book published by Springer (2000)

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See detailOptimized approach to retrieve information on the tropospheric and stratospheric carbonyl sulfide (OCS) vertical distributions above Jungfraujoch from high-resolution FTIR solar spectra
Lejeune, Bernard ULg; Mahieu, Emmanuel ULg; Servais, Christian ULg et al

in Geophysical Research Abstracts (2010), 12(EGU2010-3513),

Carbonyl sulfide (OCS), which is produced in the troposphere from both biogenic and anthropogenic sources, is the most abundant gaseous sulfur species in the unpolluted atmosphere. Due to its low chemical ... [more ▼]

Carbonyl sulfide (OCS), which is produced in the troposphere from both biogenic and anthropogenic sources, is the most abundant gaseous sulfur species in the unpolluted atmosphere. Due to its low chemical reactivity and water solubility, a significant fraction of OCS is able to reach the stratosphere where it is converted to SO2 and ultimately to H2SO4 aerosols (Junge layer). These aerosols have the potential to amplify stratospheric ozone destruction on a global scale and may influence Earth’s radiation budget and climate through increasing solar scattering. The transport of OCS from troposphere to stratosphere is thought to be the primary mechanism by which the Junge layer is sustained during nonvolcanic periods. Because of this, long-term trends in atmospheric OCS concentration, not only in the troposphere but also in the stratosphere, are of great interest. A new approach has been developed and optimized to retrieve atmospheric abundance of OCS from high-resolution ground-based infrared solar spectra by using the SFIT-2 (v3.91) algorithm, including a new model for solar lines simulation (solar lines often produce significant interferences in the OCS microwindows). The strongest lines of the nu3 fundamental band of OCS at 2062 cm-1 have been systematically evaluated with objective criteria to select a new set of microwindows, assuming the HITRAN 2004 spectroscopic parameters with an increase in the OCS line intensities of the nu3band main isotopologue 16O12C32S by 15.79% as compared to HITRAN 2000 (Rothman et al., 2008, and references therein). Two regularization schemes have further been compared (deducted from ATMOS and ACE-FTS measurements or based on a Tikhonov approach), in order to select the one which optimizes the information content while minimizing the error budget. The selected approach has allowed us to determine updated OCS long-term trend from 1988 to 2009 in both the troposphere and the stratosphere, using spectra recorded on a regular basis with Fourier Transform Infrared spectrometers (FTIRs), under clear-sky conditions, at the NDACC site (Network for the Detection of Atmospheric Composition Change, visit http://www.ndacc.org) of the International Scientific Station of the Jungfraujoch (Swiss Alps, 46.5°N, 8.0°E, 3580m asl). Trends and seasonal cycles deduced from our results will be compared to values published in the literature and critically discussed. In particular, we will confirm the recent change in the OCS total column trend, which has become positive since 2002 before undergoing a slowing down over the last years. [less ▲]

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See detailOptimized conditions for the preparation of Pt supported catalysts by deposition-precipitation
Cellier Caroline; Lambert, Stéphanie ULg; Ruaux Vincent et al

Poster (2006, September)

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See detailOptimized conditions for the preparation of Pt supported catalysts by deposition-precipitation
Cellier, Caroline; Lambert, Stéphanie ULg; Lahousse, C. et al

in Studies in Surface Science and Catalysis (2006), 162

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See detailOptimized deposition of photocatalytic TiO2 thin films produced by a non-aqueous sol-gel method
Malengreaux, Charline ULg; Timmermans, Adrien; Pirard, Sophie ULg et al

Poster (2011, November)

Detailed reference viewed: 43 (21 ULg)
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See detailOptimized deposition of photocatalytic TiO2 thin films produced by a non-aqueous sol-gel method
Malengreaux, Charline ULg; Timmermans, Adrien; Pirard, Sophie ULg et al

Poster (2011, September)

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See detailOptimized deposition of TiO2 thin films produced by a non-aqueous sol-gel method and quantification of their photocatalytic activity
Malengreaux, Charline ULg; Timmermans, Adrien; Pirard, Sophie ULg et al

in Chemical Engineering Journal (2012), 195-196

TiO2 thin films have been produced by a dip-coating process using a non-aqueous sol-gel method. This study investigated the influence of the operating variables such as nature of the substrate, sol ... [more ▼]

TiO2 thin films have been produced by a dip-coating process using a non-aqueous sol-gel method. This study investigated the influence of the operating variables such as nature of the substrate, sol concentration, withdrawing speed of the dip-coater and number of layers on the physico-chemical properties of the films using XRD, GIXRD, UV-Vis spectroscopy, profilometry, spectroscopic ellipsometry and SEM. Photocatalytic activity of the films was evaluated by following the degradation of methylene blue under artificial UV light at 25°C. The performances of the catalysts were compared through the reaction rate constants determined using an apparent first-order kinetic model adjusted on the experimental data. This study showed that the photocatalytic activity and the reaction rate constant depend on the film thickness through the synthesis and dipping variable, with an optimum thickness of 80 nm being observed. An optimized transparent film exhibiting a high adhesion, a well crystallized TiO2-anatase phase, a good photocatalytic activity and a reaction rate constant k equal to 0.126 h-1 was obtained using a simple process. The specific photocatalytic activity of this film was higher to the one measured for TiO2 powders in previous works. [less ▲]

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See detailAn optimized DNA extraction and multiplex PCR for the detection of Fasciola sp. in lymnaeid snails
Caron, Yannick ULg; Righi, Souad; Lempereur, Laetitia et al

in Veterinary Parasitology (2011), 178((1-2)), 93-9

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See detailAn optimized DNA extraction and multiplex PCR for the detection of Fasciola sp. in lymnaeid snails.
Caron, Yannick ULg; Righi, Souad; Lempereur, Laetitia et al

Poster (2011, June 10)

Detailed reference viewed: 30 (8 ULg)