Výsledky vyhledávání - "Ghislain Guyot"

Photosensitizing properties of water-extractable organic matter from soils

Autor: Ezzhora Nkhili, Claire Richard, Zofia Sokołowska, Romualda Bejger, Ghislain Guyot, Patrycja Boguta

Publikováno v: Chemosphere
Chemosphere, Elsevier, 2014, 95, pp.317-323. ⟨10.1016/j.chemosphere.2013.09.023⟩
Chemosphere, 2014, 95, pp.317-323. ⟨10.1016/j.chemosphere.2013.09.023⟩

International audience; Water-extractable organic matter (WEOM) was extracted using pure water from two black soils and from the Elliott reference soil of the International Humic Substances Society (IHSS). WEOMs were characterized by chemical and spe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b5292eee27494d9b04804c25120c763
https://doi.org/10.1016/j.chemosphere.2013.09.023

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Fluorescence properties of the <5kDa molecular size fractions of a soil humic acid

Autor: Oleg Trubetskoj, Lubov Shaloiko, Ghislain Guyot, Olga Trubetskaya, Christian Coelho, Claire Richard

Publikováno v: Geoderma
Geoderma, 2011, 163, pp.24-29. ⟨10.1016/j.geoderma.2011.03.003⟩
Geoderma, Elsevier, 2011, 163, pp.24-29. ⟨10.1016/j.geoderma.2011.03.003⟩

International audience; Soil humic acids are complex mixtures displaying several still unexplained spectral properties. In this work, we aimed to investigate the fluorescent properties of soil humic acid macromolecules of molecular sizes less than 5

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c991ac0f505cebb7c83a6c66affbc96
https://doi.org/10.1016/j.geoderma.2011.03.003

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Excitation–Emission Matrices of Fluorescence – EEMF – for the Characterization of Organic Matter of Surface Waters

Autor: Christian Coelho, Ghislain Guyot

Publikováno v: Surface Water Photochemistry ISBN: 9781782620433

Excitation Emission Matrices – EEMs – are three-dimensional representations of the total emissive light in terms of intensity and diversity of emission wavelengths one sample can gather when irradiated in a fixed range of excitation wavelength, g

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f545fb71a3f8dda0060578a04d322b2b
https://doi.org/10.1039/9781782622154-00097

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Spectral properties of probes based on pyrene and piperazine: the singlet and triplet route of deactivation

Autor: Jozef Kollár, Štefan Chmela, Pavol Hrdlovič, Ghislain Guyot, Mohamed Sarakha

Publikováno v: Journal of Photochemistry and Photobiology A: Chemistry. 171:27-38

Probes, composed of pyrene (Py) and piperazine (7,15-diazadispiro[5.1.5.3]hexadecane or 7,15-diazadispiro[5.1.5.3]hexadecane-14,16-dione) (PA) linked directly or through methylene group (Me) were prepared. Probe with direct link is 15-(1-pyrenyl)-7,1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a6860fe26e35ac97f3a96ede7fe53eac
https://doi.org/10.1016/j.jphotochem.2004.08.024

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Synthesis and transient absorption spectra of derivatives of 1,8-naphthalic anhydrides and naphthalimides containing 2,2,6,6-tetramethylpiperidine; triplet route of deactivation

Autor: Štefan Chmela, Ghislain Guyot, Jozef Kollár, Mohamed Sarakha, Pavol Hrdlovič

Publikováno v: Journal of Photochemistry and Photobiology A: Chemistry. 170:151-159

Novel probes represented 4-substituted 1,8-naphtalic anhydride and 1,8-naphthalimide as a chromophore and sterically hindered amine in the form of parent amine as well as stable nitroxyl radical form were synthesized. Laser flash photolysis was used

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6c8251279e00b1f0f44f27163e7d75dd
https://doi.org/10.1016/j.jphotochem.2004.07.021

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Photochemistry of substituted 4-halogenophenols: effect of a CN substituent

Autor: Claire Richard, Gottfried Grabner, Ghislain Guyot, Florent Bonnichon

Publikováno v: Journal of the Chemical Society, Perkin Transactions 2. :1203-1210

The photochemistry of 5-chloro-2-hydroxybenzonitrile 1 was studied in aqueous solution using transient absorption spectroscopy and product analysis. The triplet carbene 3-cyano-4-oxocyclohexa-2,5-dienylidene 2 (λmax/nm 385, 368) was successfully det

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ff8074bb3c7e5d05a7cb033cc774ead0
https://doi.org/10.1039/a900141g

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Extractability of water-soluble soil organic matter as monitored by spectroscopic and chromatographic analyses

Autor: Ghislain Guyot, Nathalie Vassal, Claire Richard, Ezzhora Nkhili

Publikováno v: Environmental Science and Pollution Research
Environmental Science and Pollution Research, Springer Verlag, 2012, 19, pp.2400-2407
Environmental Science and Pollution Research, 2012, 19, pp.2400-2407. ⟨10.1007/s11356-012-0752-0⟩
Environmental Science and Pollution Research, Springer Verlag, 2012, 19, pp.2400-2407. ⟨10.1007/s11356-012-0752-0⟩

International audience; Cold and hot water processes have been intensively used to recover soil organic matter, but the effect of extraction conditions on the composition of the extracts were not well investigated. Our objective was to optimize the e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7baaba0c30912735ae618902a23474b7
https://hal.archives-ouvertes.fr/hal-00786982

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Rates of production of hydroxyl radicals and singlet oxygen from irradiated compost

Autor: Luciano Cavani, Alexandra ter Halle, Ghislain Guyot, Christian Coelho, Claire Richard, Claudio Ciavatta

The use of organic matter from compost to promote the catalytic photodegradation of micropollutants by solar light appears to be environmentally promising. However, quantitative evaluation of the photodegradation potential of the compost is needed. O

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba0dee8baaf3fbb17ff233f280894e8d
http://hdl.handle.net/11585/106612

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ChemInform Abstract: Silver(I) Perturbation of (E)-(Z) Photoisomerization of Stilbene and Azobenzene

Autor: Lucia Flamigni, Michèle Bolte, Sandra Monti, Ghislain Guyot, Pietro Bortolus

Publikováno v: ChemInform. 22

The influence of AgClO4 on the photochemical behaviour of stilbene and azobenzene in acetonitrile and methanol has been compared with that of Nal, a well known perturber of the excited-state properties via the heavy-atom effect. Both the salts quench

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ea0c30ece3a58558cbb434659d6ee547
https://doi.org/10.1002/chin.199133097

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Relationship between Photosensitizing and Emission Properties of Peat Humic Acid Fractions Obtained by Tangential Ultrafiltration

Autor: Abdelaziz Boulkamh, Sabrina Halladja, Ghislain Guyot, Alexandra ter Halle, Luciano Cavani, Giampietro Corrado, Claudio Ciavatta, Claire Richard

Publikováno v: Environmental Science and Technology
Environmental Science and Technology, American Chemical Society, 2009, 43 (12), pp.4348-4354
Environmental Science and Technology, 2009, 43 (12), pp.4348-4354

Peat humic acid was fractionated by tangential ultrafiltration into six nominal molecular weight (NMW) fractions, HA5-10, HA10-20, HA20-50, HA50-100, HA100-300 and HA300, which were purified by dialysis using a 0.5 kDa membrane. The absorbing and emi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1da2407fab4a59a017f284f5f421438a
https://hal.archives-ouvertes.fr/hal-00402677

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