Frédérique Bonnemoy

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Tunable functionality and toxicity studies of titanium dioxide nanotube layers

Thin Solid Films (2011)

Emmanuelle Feschet-Chassot Vincent Raspal Yves Sibaud O.K. Awitor Frédérique Bonnemoy

Titanium Dioxide

Anodizing

Hydrofluoric acid

10.1016/j.tsf.2010.12.184

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Citations (29)

Sequential bio‐ and phototransformation of the herbicide methabenzthiazuron in water

Environmental Toxicology and Chemistry (2003)

Moulay Abderrahmane Malouki Géraldine Giry P. Besse-Hoggan Besse-Hoggan Pascale Pascale Besse Bruno Combourieu Martine Sancelme

Abstract We investigated the transformation of methabenzthiazuron in water by microorganisms and solar light. This compound was very slowly phototransformed when irradiated at λ > 290 nm, but it could be successfully oxidized into 6-hydroxymethabenzthiazuron by Aspergillus niger, as shown by nuclear magnetic resonance experiments. The toxicity of this metabolite, as determined by the standardized Microtox® test, was sixfold lower than that of the parent molecule. The 6-hydroxymethabenzthiazuron was not further metabolized by A. niger but was photooxidized with ring cleavage of the aromatic ring and photodimerized on irradiation at λ > 290 nm. In the presence of humic substances, the photodegradation was slower. We demonstrate that the transformations of methabenzthiazuron, observed either with the fungus A. niger or by the action of solar light, do not proceed via the urea chain N-dealkylation, as usually reported, but only via hydroxylation or cleavage of the benzene ring. This work shows the complementarity of both approaches, photo- and biodegradation, to study the fate of herbicides in the environment.

Aspergillus niger

Cleavage (geology)

Photodegradation

Hydroxylation

10.1002/etc.5620220908

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Inhibition of the cellulolytic activity of Neocallimastix frontalis by Ruminococcus flavefaciens

Journal of General Microbiology (1993)

Annick Bernalier Gérard Fonty Frédérique Bonnemoy Philippe Gouet

A study was made of the antagonistic effect of Ruminococcus flavefaciens on the cellulolytic activity of Neocallimastix frontalis. An extracellular factor inhibiting the cellulolytic activity of the fungus was detected in the bacterial supernatant. The antagonistic factor, which precipitated with ammonium sulphate at 40% saturation, was temperature-sensitive and was destroyed at temperatures above 60 °C. After separation by anion-exchange chromatography, sequential precipitation, dialysis and SDS-PAGE, two protein species of 100 and 24 kDa were identified as being involved in this antagonistic effect. It is not known whether the proteins are two subunits of a single protein or represent two different proteins. The inhibitory factor, which is not a bacterial cellulase, did not affect fungal growth, but it inhibited the activity of the fungal cellulases.

Ammonium sulfate precipitation

Ruminococcus

10.1099/00221287-139-4-873

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Citations (41)

Effect of Eubacterium limosum, a ruminal hydrogenotrophic bacterium, on the degradation and fermentation of cellulose by 3 species of rumen anaerobic fungi

annales de biologie animale biochimie biophysique (1993)

Annick Bernalier Gérard Fonty Frédérique Bonnemoy Philippe Gouet

Eubacterium

Axenic

10.1051/rnd:19930609

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Citations (13)

Use of the Ciliated Protozoan Tetrahymena pyriformis for the Assessment of Toxicity and Quantitative Structure–Activity Relationships of Xenobiotics: Comparison with the Microtox Test

Ecotoxicology and Environmental Safety (2001)

Philippe Bogaerts Jacques Bohatier Frédérique Bonnemoy

Tetrahymena pyriformis

Ecotoxicity

10.1006/eesa.2001.2074

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Citations (52)

Toxicity Assessment of the Herbicides Sulcotrione and Mesotrione Toward Two Reference Environmental Microorganisms: Tetrahymena pyriformis and Vibrio fischeri

Archives of Environmental Contamination and Toxicology (2008)

J.L. Bonnet Frédérique Bonnemoy Martine Dusser Jacques Bohatier

Tetrahymena pyriformis

Mesotrione

Selenastrum

10.1007/s00244-008-9145-2

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Citations (102)

Photodégradation de chlorophénylurées induite par les nitrates et les nitrites et impact écotoxicologique en milieu aquatique.

HAL (Le Centre pour la Communication Scientifique Directe) (2006)

Sylvie Nélieu Muthukonda Shankar Frédérique Bonnemoy Jacques Bohatier Luz Lefeurvre-Orfila

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Effect of anaerobic fungi on the ruminal proteolysis in gnotobiotic lambs

annales de biologie animale biochimie biophysique (1993)

Proteolysis

10.1051/rnd:19930606

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Phototransformation of three herbicides: chlorbufam, isoproturon, and chlorotoluron. Influence of irradiation on toxicity

International Journal of Photoenergy (2000)

Céline Tixier Laurence Meunier Frédérique Bonnemoy Pierre Boule

The direct phototransformations in aqueous solution of chlorbufam (I), chlorotoluron (II), and isoproturon (III) are compared. With I and II photohydrolysis (substitution of chlorine atom with formation of the corresponding hydroxylated derivative) is initially almost quantitative. It does not depend on irradiation wavelength in the range 250–300 nm. In contrast with III the main reaction is a free radical rearrangement, the reaction being more efficient at 254nm than at wavelengths longer than 270 nm. Compounds II and III were also irradiated on sand in the absence of water. Several photoproducts were identified, they result from elimination or oxidation of methyl groups of urea moiety. The toxicity of photoproducts was determined using the standard Microtox ® test (toxicity on the bacterium Vibrio fischeri ). Photohydrolysis of I and II does not change much the toxicity of solutions whereas the oxidation, or at a lower scale the elimination of methyl group on the urea moiety, dramatically increases the toxicity.

10.1155/s1110662x00000015

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Citations (35)

Frédérique Bonnemoy

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