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See detailMethane distributions and sea-to-air fluxes in the South China Sea and the West Philippines Sea
Tseng; Chen; Borges, Alberto ULg et al

Poster (2015, July 07)

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See detailMethane in the South China Sea and the Western Philippine Sea
Tseng, Hsiao-Chun; Chen, Chen-Tung Arthur; Borges, Alberto ULg et al

in Continental Shelf Research (2017), 135

Approximately 700 water samples from the South China Sea (SCS) and 300 water samples from the western Philippine Sea (wPS) were collected during eight cruises from August 2003 to July 2007 to determine ... [more ▼]

Approximately 700 water samples from the South China Sea (SCS) and 300 water samples from the western Philippine Sea (wPS) were collected during eight cruises from August 2003 to July 2007 to determine methane (CH4) distributions from the surface to a depth of 4250 m. The surface CH4 concentrations exceeded atmospheric equilibrium, both in the SCS and the wPS, and the concentrations were 4.5±3.6 and 3.0±1.2 nmol L−1, respectively. The sea-to-air fluxes were calculated, and the SCS and the wPS were found to emit CH4 to the atmosphere at 8.6±6.4 µmol m−2 d−1 and 4.9±4.9 µmol m−2 d−1, respectively. In the SCS, CH4 emissions were higher over the continental shelf (11.0±7.4 µmol m−2 d−1) than over the deep ocean (6.1±6.0 µmol m−2 d−1), owing to greater biological productivity and closer coupling with the sediments on the continental shelf. The SCS emitted 30.1×106 mol d−1 CH4 to the atmosphere and exported 1.82×106 mol d−1 CH4 to the wPS. The concentrations of both CH4 and chlorophyll a were high in the 150 m surface layer of the wPS, but were not significantly correlated with each other. CH4 concentrations generally declined with increasing depth below the euphotic zone but remained constant below 1,000 m, both in the SCS and the wPS. Some high CH4 concentrations were observed at mid-depths and bottom waters in the SCS, and were most likely caused by the release of CH4 from gas hydrates or gas seepage. [less ▲]

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See detailMethane production in sediments: the results of a theoretical model
François, Louis ULg; Walker, J. C. G.

in Crutzen, P. J.; Gérard, J.-C.; Zander, R. (Eds.) Our Changing Atmosphere, Proceedings of the 28th Liège International Astrophysical Colloquium (1989)

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See detailMethanol dissociative adsorption on Pt(1 0 0) as studied by nonlinear vibrational spectroscopy
Vidal, Franck; Busson, B.; Six, C. et al

in Journal of Electroanalytical Chemistry (2004), 563

The methanol dissociative adsorption on Pt(1 0 0) at low potentials in the hydrogen region is studied using nonlinear vibrational sum-frequency generation (SFG) spectroscopy. It is shown that adsorbed ... [more ▼]

The methanol dissociative adsorption on Pt(1 0 0) at low potentials in the hydrogen region is studied using nonlinear vibrational sum-frequency generation (SFG) spectroscopy. It is shown that adsorbed hydrogen atoms effectively block atop sites at the surface. In the hydrogen potential region, CO produced by the methanol dissociation adsorbs at step-edges and in bridge sites on terraces as shown by the characteristic stretching frequencies observed for adsorbed CO. [less ▲]

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See detailMethanol emissions from maize: Ontogenetic dependence to varying light conditions and guttation as an additional factor constraining the flux
Mozaffar, Ahsan ULg; Schoon, N.; Digrado, Anthony ULg et al

in Atmospheric Environment (2017), 152

Because of its high abundance and long lifetime compared to other volatile organic compounds in the atmosphere, methanol (CH3OH) plays an important role in atmospheric chemistry. Even though agricultural ... [more ▼]

Because of its high abundance and long lifetime compared to other volatile organic compounds in the atmosphere, methanol (CH3OH) plays an important role in atmospheric chemistry. Even though agricultural crops are believed to be a large source of methanol, emission inventories from those crop ecosystems are still scarce and little information is available concerning the driving mechanisms for methanol production and emission at different developmental stages of the plants/leaves. This study focuses on methanol emissions from Zea mays L. (maize), which is vastly cultivated throughout the world. Flux measurements have been performed on young plants, almost fully grown leaves and fully grown leaves, enclosed in dynamic flow-through enclosures in a temperature and light-controlled environmental chamber. Strong differences in the response of methanol emissions to variations in PPFD (Photosynthetic Photon Flux Density) were noticed between the young plants, almost fully grown and fully grown leaves. Moreover, young maize plants showed strong emission peaks following light/dark transitions, for which guttation can be put forward as a hypothetical pathway. Young plants’ average daily methanol fluxes exceeded by a factor of 17 those of almost fully grown and fully grown leaves when expressed per leaf area. Absolute flux values were found to be smaller than those reported in the literature, but in fair agreement with recent ecosystem scale flux measurements above a maize field of the same variety as used in this study. [less ▲]

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See detailMethanotrophy within the water column of a large meromictic tropical lake (Lake Kivu, East Africa)
Morana, C.; Borges, Alberto ULg; Roland, Fleur ULg et al

in Biogeosciences (2015), 12(7), 2077-2088

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See detailMethionine-derived Schiff base as selective fluorescent “turn-on”chemosensor for Zn2+in aqueous medium and its application in livingcells imaging
Faiz-Ur-Rahman; Ali, Amjad ULg; Rong Guo et al

in Sensors and Actuators B: Chemical (2015)

tWe describe the quantitative synthesis of a Schiff base derived from methionine and salicylaldehyde(SMSB) which displayed turn-on selective fluorescent chemo-sensing properties for Zn2+in bufferedCH3CN ... [more ▼]

tWe describe the quantitative synthesis of a Schiff base derived from methionine and salicylaldehyde(SMSB) which displayed turn-on selective fluorescent chemo-sensing properties for Zn2+in bufferedCH3CN/H2O (1:1) solution. In physiological pH (7.2 buffered) SMSB exhibited high selectivity and sen-sitivity toward Zn2+over the other selected metal ions. Upon the addition of Zn2+33 folds of emissionenhancement was observed in SMSB and limit of detection (CL) for Zn2+was found to be 5.0 × 10−7M. Thisbinding phenomenon was studied by1H NMR and HR-MS analysis. Mass spectrometry analysis revealedthat SMSB interacts with Zn2+and form a 1:1 complex, also confirmed by Job’s plot. This probe wascompletely retrieved by adding EDTANa2solution, exhibited a fluorescent quenching effect by removingZn2+from the sensor. SMSB was observed to have a good tolerance for fluorescence detection of Zn2+in pH range 6–10. Furthermore it is successfully investigated for living cells imaging using MCF-7 cells.Combine experimental results indicated SMSB to be a useful and powerful chemosensing probe for Zn2+in water as well as in living cells. [less ▲]

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See detailMethis (7): Agir dans la ville.
Hamers, Jérémy ULg; Darcis, Damien ULg

Book published by Editions de l’Université de Liège (2017)

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See detailMethIS I : Réalité et Représentation
Cormann, Grégory ULg; Dozo, Björn-Olav ULg; Letawe, Céline ULg

Book published by Editions de l’Université de Liège (2008)

Detailed reference viewed: 53 (22 ULg)
See detailMethIS V. La valeur de la science. Pourquoi évaluer la recherche
Cormann, Grégory ULg; Dozo, Björn-Olav ULg; Polis, Stéphane ULg

Book published by Presses universitaires de Liège (in press)

Actes du colloque du 10 et 11 décembre 2009 qui s'est tenu à Liège à l'initiative du personnel scientifique

Detailed reference viewed: 96 (24 ULg)
See detailMETHis VI. Images fixes / Images en mouvement
Bert, Mathilde ULg; Falque, Ingrid ULg; Hagelstein, Maud ULg

Book published by Presses Universitaires de Liège (2016)

Dans le domaine de la théorie de l’image (que celle-ci soit matérielle, imagi- naire, animée, littéraire, onirique, etc.), la réflexion actuelle porte fréquemment sur les liens de l’image au mouvement. Et ... [more ▼]

Dans le domaine de la théorie de l’image (que celle-ci soit matérielle, imagi- naire, animée, littéraire, onirique, etc.), la réflexion actuelle porte fréquemment sur les liens de l’image au mouvement. Et pour cause, ce lien s’avère essentiel : comme le montraient déjà les expérimentations chronophotographiques du pionnier de la photographie Etienne-Jules Marey, l’image – pourtant caractérisée par sa fixité – nourrit depuis toujours un rapport constant avec l’idée de mouvement. D’ailleurs, à observer les travaux récents des chercheurs concer- nés par le visuel, quand l’image fixe – picturale ou photographique – s’envisage désormais depuis le point de vue de la Dynamis, l’image animée est de plus en plus régulièrement valorisée dans sa fixité. Le plan peut ainsi par exemple être isolé du flux cinématographique, lorsque l’on interroge sa valeur d’exposition, ou lorsqu’il est érigé en image emblématique : le cinéaste Stanley Kubrick parlait à propos de telles images d’« unités insubmersibles » (non-submersible units) et exigeait d’un grand film qu’il en comprenne au moins six. L’image fixe serait fondamentalement liée à la perception d’une énergétique, quand l’image animée serait dépendante de la possibilité d’être immobilisée. Loin d’être paradoxal, ce constat définit à nos yeux la nature dialectique de l’image. Sans vouloir attribuer définitivement à cette dernière le caractère « fixe » ou « mouvant », il importera dans les textes rassemblés ici de proposer un modèle nuancé, capable de décrire concrètement la rythmique inhérente aux objets du champ visuel. Depuis les domaines de recherche variés qui nous occupent, et en repartant des cas concrets et particuliers qui attisent notre curiosité, on essaiera d’apporter notre contribution à une science culturelle transdisciplinaire, convaincus que seule une vision transversale des médias permettra de saisir l’image dans sa complexité. [less ▲]

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See detailMethIS, 2 : Pratiques du document
Letawe, Céline ULg; Polis, Stéphane ULg; Stasse, Bauduin ULg et al

Book published by CEFAL/Editions de l'ULg (2009)

Detailed reference viewed: 64 (30 ULg)
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See detailA method allowing long term culture and expansion of chicken primordial germ cells
Tonus, Céline ULg; Waroux, Olivier ULg; Grobet, Luc ULg

Conference (2013, March 12)

We developed an original method allowing long term culture (up to 20 month) of undifferentiated chicken PGCs, with good proliferation rates. We use a co-culture system: PGCs are cultivated in cell culture ... [more ▼]

We developed an original method allowing long term culture (up to 20 month) of undifferentiated chicken PGCs, with good proliferation rates. We use a co-culture system: PGCs are cultivated in cell culture inserts, in the presence of irradiated Buffalo Rat Liver cells. According to our own experience, physical separation of PGCs and feeder cells limits the differentiation of PGCs. Our PGCs lines keep their original phenotype including their gonadal colonization ability. We also developed a novel cryopreservation method based on vitrification, in complement of a slow rate freezing. [less ▲]

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See detailA method and an apparatus for separating a first amount of liquid
Vandewalle, Nicolas ULg; Gilet, Tristan; Jérôme, Christine ULg et al

Patent (2010)

The invention relates to a method for separating a first amount of liquid into a plurality of second amounts of liquid, the method comprising the steps of bringing the first amount of liquid (210) into ... [more ▼]

The invention relates to a method for separating a first amount of liquid into a plurality of second amounts of liquid, the method comprising the steps of bringing the first amount of liquid (210) into contact with at least one first fibre (110) being arranged substantially vertical, allowing the first amount of liquid to drain of the first fibre, thereby forming a coating film on the fibre, allowing the coating film to decompose, thereby forming a plurality of second amounts of liquid (220), and allowing the second amounts of liquid to drain of the first fibre and being captured at a crossing point (130) being constituted by the first fibre and at least one second fibre (120) being arranged substantially perpendicular to the first fibre and touching the first fibre. Furthermore, the invention relates to an apparatus for separating a first amount of liquid into a plurality of second amounts of liquid. [less ▲]

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See detailMethod and device for synthesizing labeled compounds
Lemaire, Christian ULg; Damhaut, Philippe; Monclus, Michel et al

Patent (1997)

A method for synthesizing compds. labeled with any isotopic element is disclosed. The method comprises the steps of prepg. the labeling agent, labeling a precursor in the form of a protected substrate ... [more ▼]

A method for synthesizing compds. labeled with any isotopic element is disclosed. The method comprises the steps of prepg. the labeling agent, labeling a precursor in the form of a protected substrate, pre-​purifying and deprotecting same, and forming a final soln. of the resulting compd. The deprotection step, in which the labeled precursor is converted into a labeled compd., is performed directly on a solid medium in a column or a cartridge. A device for synthesizing the labeled compd. according to said method is also disclosed. Thus, 2-​[18F]​fluoro-​2-​deoxy-​D-​glucose and 1,​3,​4,​6-​tetra-​O-​acetyl-​2-​trifluoromethanesulfonyl-​β-​D-​mannopyranose were prepd. [less ▲]

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See detailMethod and kit for the measurement of neutrophil cell activation
Serteyn, Didier ULg; Deby-Dupont, Ginette; Franck, Thierry ULg et al

Patent (2006)

The present invention is related to methods and kits (or devices) for the measurement of equine myeloperoxidase (MPO), a specific enzyme of equine neutrophils, either in total [first method], or ... [more ▼]

The present invention is related to methods and kits (or devices) for the measurement of equine myeloperoxidase (MPO), a specific enzyme of equine neutrophils, either in total [first method], or specifically in its active form [second method]. Said methods and kits (or devices), used independently or in combination, find improved applications in the veterinary field and can be adapted for application in human health care. The concept of the second method is applicable to any other enzyme. [less ▲]

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See detailMethod and Tools for an Objective Approach of White Dwarf Asteroseismology
Charpinet, S.; Giammichele, N.; Brassard, P. et al

in Astronomical Society of the Pacific Conference Series (2015, June), 493

Stellar oscillation modes propagate deep inside stars and carry on information potentially allowing us to reconstruct, through asteroseismology, parts of their internal structure and dynamics. We present ... [more ▼]

Stellar oscillation modes propagate deep inside stars and carry on information potentially allowing us to reconstruct, through asteroseismology, parts of their internal structure and dynamics. We present and discuss here our strategy and tools developed to exploit objectively this potential for pulsating white dwarf stars. Our approach relies on a multimodal optimization technique aimed at identifying all potential seismic model solutions that best match the observed periods of a given star. This approach doesn't rely on model grids (hence avoiding their limitations) and makes use of static stellar structures of white dwarf stars as opposed to evolutionary models. The use of parameterized static models is a deliberate choice in this context and is aimed at approaching as closely as possible the real structure of the star as it is observed and probed by the detected oscillation modes without interferences from unavoidable model uncertainties propagated through billion years of evolution. We argue that this strategy is more likely to produce new tight constraints on the internal structure of white dwarf stars from which evolutionary models could be improved. [less ▲]

Detailed reference viewed: 8 (0 ULg)