Search results for "Iode"

Influence de la biodégradation dans l’atténuation des pesticides sur un bassin versant viticole : potentialité des différents éléments du paysage et …

2013

Nos travaux ont montré que les différents compartiments d'un paysage viticole du site atelier de la Morcille (sol de la parcelle, bande enherbée et sédiments) connectés le long du continuum sol-eau, présentaient une aptitude à minéraliser le diuron. La capacité épuratrice de ces différents compartiments évolue en fonction du niveau d’exposition au contaminant. Ainsi la zone tampon exposée présente une meilleure aptitude à épurer le diuron que la zone tampon témoin. Les sédiments de la Morcille situés à proximité de la zone tampon présentent également une capacité épuratrice présentant un gradient amont-aval coïncidant avec le gradient amont-aval observé également pour la qualité chimique de…

Categorization of chlordecone potential transformation products to predict their environmental fate

2016

EABIOmE; Chlordecone (C10Cl10O; CAS number 143-50-0) has been used extensively as an organochlorine insecticide but is nowadays banned and listed on annex A in The Stockholm Convention on Persistent Organic Pollutants (POPs). Although experimental evidences of biodegradation of this compound are scarce, several dechlorination products have been proposed by Dolfing et al. (2012) using Gibbs free energy calculations to explore different potential transformation routes. We here present the results of an in silico classification (TyPol similar to Typology of Pollutants) of chlordecone transformation products (TPs) based on statistical analyses combining several environmental endpoints and struc…

Etude des mécanismes à l'origine de la dispersion des gènes codant les enzymes responsables de la minéralisation de l'atrazine au sein de la microflo…

2006

Assessment of pesticides ecotoxicology on soil microorganism

2014

National audience

Contribution à l'élaboration de biodescripteurs microbiens pour l'évaluation de l'état biologique et la compréhension du fonctionnement du sol

2013

Dispersal potential of antibiotrophy along the manure-soil-sediment continuum of sulfamethazine-contaminated agrosystems

2021

An emerging function in the scientific literature, antibiotrophy is the bacterial capacity to metabolize antibiotics. Considered a bioremediation tool, it remains a health risk due to its association with antibiotic resistance. The first goal of this thesis was to study its dispersion within agrosystems contaminated with antibiotics during two coalescence events, i.e. manure spreading on the soil and its erosion towards the aquatic compartment. Experiments have shown the systematic invasion of the soil and sediment bacterial communities by the antibiotroph Microbacterium sp. C448 when sulfamethazine is present but not necessarily mineralized. The antibiotic would have a double function towa…

Transcriptomic and proteomic responses of Microbacterium sp. C448 exposed to sulfamethazine antibiotic

2022

International audience; The Microbacterium sp. C448 was isolated from a soil regularly exposed to sulfamethazine(SMZ), for its ability to partly mineralise this antibiotic and other related sulfonamides.The aim of our study was to explore its metabolic adaptation towards exposure to SMZenvironmental (10 mg/L) and medicinal (250 mg/L) concentrations. Its transcriptomic andproteomic responses were analysed by focusing on the degradation regulon (sad genes) andresistance genes (folP and sul1).The transcriptomic and proteomic results were essentially congruent whatever theconcentrations tested. In culture conditions, exposure to the highest concentration of SMZ led tothe highest sad expression …

Evidence of atrazine mineralization in a soil from the Nile Delta: Isolation of Arthrobacter sp. TES6, an atrazine-degrading strain

2011

International audience; The s-triazine herbicide atrazine was rapidly mineralized (i.e., about 60% of C-14-ring-labelled atrazine released as (CO2)-C-14 within 21 days) by an agricultural soil from the Nile Delta (Egypt) that had been cropped with corn and periodically treated with this herbicide. Seven strains able to degrade atrazine were isolated by enrichment cultures of this soil. DNA fingerprint and phylogenetic studies based on 165 rRNA analysis showed that the seven strains were identical and belonged to the phylogeny of the genus Arthrobacter (99% similarity with Arthrobacter sp. AD38, EU710554). One strain, designated Arthrobacter sp. strain TES6, degraded atrazine and mineralized…

Eradication of Plasmodiophora brassicae during composting of wastes

2006

Survival of infectious inoculum of the clubroot pathogen Plasmodiophora brassicae was assessed following bench-scale flask composting experiments and large-scale composting procedures. Clubroot-affected material was provided by artificial inoculation of Chinese cabbage or naturally infected Brussels sprout and cabbage roots. Both sets of diseased material were used in flask experiments, and the latter in large-scale windrow and aerated tunnel experiments. Municipal green wastes, onion waste and spent mushroom compost were evaluated in flask experiments with varying temperature, aeration and moisture conditions. Green wastes were used in larger-scale composts. Within the limits of a Chinese …

Les restes animaux du site des Bonnettes (Pas-de-Calais)

1994

International audience