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Your search keyword '"Delacuvellerie A"' showing total 13 results
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13 results on '"Delacuvellerie A"'

7. Coculture of Trichoderma harzianum and Bacillus velezensis Based on Metabolic Cross-Feeding Modulates Lipopeptide Production

Author

Barbara Fifani, Sebastien Steels, Catherine Helmus, Alice Delacuvellerie, Barbara Deracinois, Vincent Phalip, Frank Delvigne, and Philippe Jacques

Subjects
Bacillus velezensis, Trichoderma harzianum, microbial interaction, coculture, nutritional dependency, nitrogen, Biology (General), QH301-705.5
Abstract

Cocultures have been widely explored for their use in deciphering microbial interaction and its impact on the metabolisms of the interacting microorganisms. In this work, we investigate, in different liquid coculture conditions, the compatibility of two microorganisms with the potential for the biocontrol of plant diseases: the fungus Trichoderma harzianum IHEM5437 and the bacterium Bacillus velezensis GA1 (a strong antifungal lipopeptide producing strain). While the Bacillus overgrew the Trichoderma in a rich medium due to its antifungal lipopeptide production, a drastically different trend was observed in a medium in which a nitrogen nutritional dependency was imposed. Indeed, in this minimum medium containing nitrate as the sole nitrogen source, cooperation between the bacterium and the fungus was established. This is reflected by the growth of both species as well as the inhibition of the expression of Bacillus genes encoding lipopeptide synthetases. Interestingly, the growth of the bacterium in the minimum medium was enabled by the amendment of the culture by the fungal supernatant, which, in this case, ensures a high production yield of lipopeptides. These results highlight, for the first time, that Trichoderma harzianum and Bacillus velezensis are able, in specific environmental conditions, to adapt their metabolisms in order to grow together.

Published
2022
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8. Long-term immersion of compostable plastics in marine aquarium:Microbial biofilm evolution and polymer degradation

Author

Delacuvellerie, Alice, Brusselman, Axelle, Cyriaque, Valentine, Benali, Samira, Moins, Sébastien, Raquez, Jean Marie, Gobert, Sylvie, Wattiez, Ruddy, Delacuvellerie, Alice, Brusselman, Axelle, Cyriaque, Valentine, Benali, Samira, Moins, Sébastien, Raquez, Jean Marie, Gobert, Sylvie, and Wattiez, Ruddy

Abstract

The best-selling compostable plastics, polylactic acid (PLA) and polybutylene adipate-co-terephthalate (PBAT), can accidentally end up in the marine environment due to plastic waste mismanagement. Their degradation and colonization by microbial communities are poorly documented in marine conditions. To better understand their degradation, as well as the dynamics of bacterial colonization after a long immersion time (99, 160, and 260 days), PBAT, semicrystalline, and amorphous PLA films were immersed in a marine aquarium. Sequencing and chemical analyses were used in parallel to characterize these samples. Despite the variation in the chemical intrinsic parameters of these plastics, their degradation remains very slow. Microbial community structure varied according to the immersion time with a high proportion of Archaea. Moreover, the plastisphere structure of PBAT was specific. A better understanding of compostable plastic degradability is crucial to evaluate their impact on ecosystems and to eco-design new recyclable plastics with optimal degradation properties., The best-selling compostable plastics, polylactic acid (PLA) and polybutylene adipate-co-terephthalate (PBAT), can accidentally end up in the marine environment due to plastic waste mismanagement. Their degradation and colonization by microbial communities are poorly documented in marine conditions. To better understand their degradation, as well as the dynamics of bacterial colonization after a long immersion time (99, 160, and 260 days), PBAT, semicrystalline, and amorphous PLA films were immersed in a marine aquarium. Sequencing and chemical analyses were used in parallel to characterize these samples. Despite the variation in the chemical intrinsic parameters of these plastics, their degradation remains very slow. Microbial community structure varied according to the immersion time with a high proportion of Archaea. Moreover, the plastisphere structure of PBAT was specific. A better understanding of compostable plastic degradability is crucial to evaluate their impact on ecosystems and to eco-design new recyclable plastics with optimal degradation properties.

Published
2023

9. Coculture of

Author

Barbara, Fifani, Sebastien, Steels, Catherine, Helmus, Alice, Delacuvellerie, Barbara, Deracinois, Vincent, Phalip, Frank, Delvigne, and Philippe, Jacques

Abstract

Cocultures have been widely explored for their use in deciphering microbial interaction and its impact on the metabolisms of the interacting microorganisms. In this work, we investigate, in different liquid coculture conditions, the compatibility of two microorganisms with the potential for the biocontrol of plant diseases: the fungus

Published
2022

11. The P40 and P100 Processing Positivities That Precede P300 Closure in Serial Somatosensory Decision Tasks

Author

Martine Delacuvellerie, Nguyen Tran Huy, Marc Bourguet, and Jean Edouard Desmedt

Subjects
Adult, General Neuroscience, Decision Making, Sensation, Closure (topology), Electroencephalography, Somatosensory Cortex, Somatosensory system, General Biochemistry, Genetics and Molecular Biology, Fingers, Thumb, History and Philosophy of Science, Evoked Potentials, Somatosensory, Humans, Attention, Female, Arousal, Dominance, Cerebral, Psychology, Cognitive psychology
Published
1984
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