The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Sylvie Biagianti-risbourg - One of the best experts on this subject based on the ideXlab platform.
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Metallothioneins induction and antioxidative response in aquatic worms Tubifex Tubifex (Oligochaeta, Tubificidae) exposed to copper
Chemosphere, 2005Co-Authors: Yahia Y. Mosleh, Séverine Paris-palacios, Sylvie Biagianti-risbourgAbstract:Abstract Metallothioneins (MTs), are low molecular weight proteins, mainly implicated in metal ion detoxification. Increase in MT contents is considered as a specific biomarker of metal exposure. Recently it has been demonstrated that MTs participate in several cellular functions such as regulation of growth, and antioxidative defences. Tubifex Tubifex were exposed to different copper concentrations (50, 100, and 200 μg l−1) for 7 and 15 days. MT levels in exposed worms increased significantly (p
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Effects of the Herbicide Isoproturon on Metallothioneins, Growth, and Antioxidative Defenses in the Aquatic Worm Tubifex Tubifex (Oligochaeta, Tubificidae)
Ecotoxicology, 2005Co-Authors: Yahia Y. Mosleh, Séverine Paris-palacios, Sylvie Biagianti-risbourg, Michel Couderchet, Guy VernetAbstract:Metallothioneins (MTs) are low molecular weight proteins, mainly implicated in metal ion detoxification. Increase in MT contents is considered to be a specific biomarker of metal exposure. Recently it has been demonstrated that MTs participate in several cellular functions such as regulation of growth, and antioxidative defenses. Therefore, the induction of MTs as biomarkers of exposure to the pesticide isoproturon has been investigated in the aquatic worms Tubifex Tubifex. MT levels in exposed worms increased significantly ( p
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Metallothionein induction in aquatic oligochaete Tubifex Tubifex exposed to herbicide isoproturon.
Environmental toxicology, 2004Co-Authors: Yahia Y. Mosleh, Séverine Paris-palacios, Sylvie Biagianti-risbourg, Michel Couderchet, Fabrice Arnoult, Guy VernetAbstract:Metallothioneins (MTs) are low-molecular-weight proteins mainly involved in metal ion detoxification. Recently it has been demonstrated that MTs participate in several cellular functions such as regulation of growth and antioxidative defenses. Moreover, pesticides can induce their synthesis. The aim of the current work was to determine the effects of isoproturon, either pure or formulated as Matin® (suspension containing an isoproturon concentration of 500 g · L−1), on the metallothionein and total protein contents of the aquatic worm Tubifex Tubifex. MT levels in exposed worms increased significantly after 7 and 15 days of exposure to a concentration of the herbicide of 50 mg · L−1. Isoproturon reduced the metal (Cu, Zn, and Cd) content of metallothioneins, and it also increased the total protein content of the worms. These results suggest that MT induction may not be considered a specific biomarker of metal exposure but that it can be used as a nonspecific biomarker of the effect of isoproturon effect in aquatic worms. © 2004 Wiley Periodicals, Inc. Environ Toxicol 19: 88–93, 2004.
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Toxic Effects and Bioaccumulation of Cadmium in the Aquatic Oligochaete Tubifex Tubifex
Ecotoxicology and environmental safety, 2000Co-Authors: Marie-laure Bouché, Sylvie Biagianti-risbourg, F. Habets, Guy VernetAbstract:Although Tubifex Tubifex (Oligochaeta, Tubificida) has been proposed as a test organism for ecotoxocological studies, very few data concerning sublethal toxicity and bioaccumulation are available on this worm. The aims of this work were to assess the toxicity of cadmium, one of the most toxic metals frequently encountered in polluted areas, on T. Tubifex and the ability of the worm to accumulate this metal. Acute toxicity was analyzed by measurement of the 96-h LC(50) and daily survival rates. Results indicated that T. Tubifex undergoes an adaptation period to Cd, the duration of which decreases with increasing Cd concentration. The various parameters affecting toxicity are discussed. Sublethal toxicity was studied by scanning electron microscopy. Observations revealed that Cd induced autotomy of the caudal region and mucus production. Autotomy is proposed as a criterion for sublethal toxicity. The results of bioaccumulation studies revealed that Cd is highly and rapidly taken up by the worm, suggesting involvement of efficient detoxification mechanisms. Consequently, the ability to accumulate large amounts of Cd may represent a potential toxicological risk to predators of the worm if Cd is accumulated in bioavailable forms.
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A light and scanning electron microscope study of the morphology of the chaetae of Tubifex Tubifex in a non-polluted medium
Hydrobiologia, 1999Co-Authors: Marie-laure Bouché, Sylvie Biagianti-risbourg, Guy VernetAbstract:The shape, number and distribution of the chaetae constitute taxonomic criteria in oligochaetes. Paradoxically, there is a lack of morphological data on the chaetal apparatus of Tubifex Tubifex. This study provides a detailed description (number, (ultra)structure and spatial arrangement) of the chaetae of normal worms, to serve as a reference for subsequent (eco)toxicological studies, since changes in the morphology of the chaetae of Tubificidae are potential markers of environmental pollution.
Guy Vernet - One of the best experts on this subject based on the ideXlab platform.
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Effects of the Herbicide Isoproturon on Metallothioneins, Growth, and Antioxidative Defenses in the Aquatic Worm Tubifex Tubifex (Oligochaeta, Tubificidae)
Ecotoxicology, 2005Co-Authors: Yahia Y. Mosleh, Séverine Paris-palacios, Sylvie Biagianti-risbourg, Michel Couderchet, Guy VernetAbstract:Metallothioneins (MTs) are low molecular weight proteins, mainly implicated in metal ion detoxification. Increase in MT contents is considered to be a specific biomarker of metal exposure. Recently it has been demonstrated that MTs participate in several cellular functions such as regulation of growth, and antioxidative defenses. Therefore, the induction of MTs as biomarkers of exposure to the pesticide isoproturon has been investigated in the aquatic worms Tubifex Tubifex. MT levels in exposed worms increased significantly ( p
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Metallothionein induction in aquatic oligochaete Tubifex Tubifex exposed to herbicide isoproturon.
Environmental toxicology, 2004Co-Authors: Yahia Y. Mosleh, Séverine Paris-palacios, Sylvie Biagianti-risbourg, Michel Couderchet, Fabrice Arnoult, Guy VernetAbstract:Metallothioneins (MTs) are low-molecular-weight proteins mainly involved in metal ion detoxification. Recently it has been demonstrated that MTs participate in several cellular functions such as regulation of growth and antioxidative defenses. Moreover, pesticides can induce their synthesis. The aim of the current work was to determine the effects of isoproturon, either pure or formulated as Matin® (suspension containing an isoproturon concentration of 500 g · L−1), on the metallothionein and total protein contents of the aquatic worm Tubifex Tubifex. MT levels in exposed worms increased significantly after 7 and 15 days of exposure to a concentration of the herbicide of 50 mg · L−1. Isoproturon reduced the metal (Cu, Zn, and Cd) content of metallothioneins, and it also increased the total protein content of the worms. These results suggest that MT induction may not be considered a specific biomarker of metal exposure but that it can be used as a nonspecific biomarker of the effect of isoproturon effect in aquatic worms. © 2004 Wiley Periodicals, Inc. Environ Toxicol 19: 88–93, 2004.
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Toxic Effects and Bioaccumulation of Cadmium in the Aquatic Oligochaete Tubifex Tubifex
Ecotoxicology and environmental safety, 2000Co-Authors: Marie-laure Bouché, Sylvie Biagianti-risbourg, F. Habets, Guy VernetAbstract:Although Tubifex Tubifex (Oligochaeta, Tubificida) has been proposed as a test organism for ecotoxocological studies, very few data concerning sublethal toxicity and bioaccumulation are available on this worm. The aims of this work were to assess the toxicity of cadmium, one of the most toxic metals frequently encountered in polluted areas, on T. Tubifex and the ability of the worm to accumulate this metal. Acute toxicity was analyzed by measurement of the 96-h LC(50) and daily survival rates. Results indicated that T. Tubifex undergoes an adaptation period to Cd, the duration of which decreases with increasing Cd concentration. The various parameters affecting toxicity are discussed. Sublethal toxicity was studied by scanning electron microscopy. Observations revealed that Cd induced autotomy of the caudal region and mucus production. Autotomy is proposed as a criterion for sublethal toxicity. The results of bioaccumulation studies revealed that Cd is highly and rapidly taken up by the worm, suggesting involvement of efficient detoxification mechanisms. Consequently, the ability to accumulate large amounts of Cd may represent a potential toxicological risk to predators of the worm if Cd is accumulated in bioavailable forms.
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an original decontamination process developed by the aquatic oligochaete Tubifex Tubifex exposed to copper and lead
Aquatic Toxicology, 1999Co-Authors: Marielaure Lucanbouche, Sylvie Biagiantirisbourg, Francois Arsac, Guy VernetAbstract:The aquatic oligochaete Tubifex Tubifex is known to be very resistant to pollution, however, the way this organism has adapted is poorly understood. T. Tubifex was present in our study-site (Reuil sur Marne, Marne, France), a retention basin that receives contaminated runoff water from a vineyard. Field observations showed that a large proportion of the worms had abnormal caudal regions (completely missing or regenerating). After experimental contamination with subacute concentrations of copper and lead, two metals that cause problems in the vineyards, the animals lost their tails. Metal determinations in the anterior and posterior parts of whole T. Tubifex from the polluted site and experimentally contaminated worms revealed a higher concentration of metals in the posterior part. These results indicated that T. Tubifex may protect itself against the increase of internal concentrations of toxic metals (Cu and Pb) by the autotomy of the caudal region in which the metals had accumulated. The capacity of the worms to regenerate was not impaired, even in contaminated medium. The possibility to use the loss of tail as a biomarker of contamination is discussed.
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A light and scanning electron microscope study of the morphology of the chaetae of Tubifex Tubifex in a non-polluted medium
Hydrobiologia, 1999Co-Authors: Marie-laure Bouché, Sylvie Biagianti-risbourg, Guy VernetAbstract:The shape, number and distribution of the chaetae constitute taxonomic criteria in oligochaetes. Paradoxically, there is a lack of morphological data on the chaetal apparatus of Tubifex Tubifex. This study provides a detailed description (number, (ultra)structure and spatial arrangement) of the chaetae of normal worms, to serve as a reference for subsequent (eco)toxicological studies, since changes in the morphology of the chaetae of Tubificidae are potential markers of environmental pollution.
Jinling Diao - One of the best experts on this subject based on the ideXlab platform.
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Selective bioaccumulation and elimination of hexachlorocyclohexane isomers in Tubifex Tubifex (Oligochaeta, Tubificidae).
Environmental science and pollution research international, 2016Co-Authors: Ledan Huang, Jinling Diao, Zhiqiang ZhouAbstract:In this study, Tubifex Tubifex worms were exposed to sediment-associated hexachlorocyclohexane (HCH) isomers to study the bioaccumulation and elimination behaviors of HCH isomers in T. Tubifex. During a 10-day bioaccumulation experiment, bioaccumulation curves of HCHs were approximate to M-type in T. Tubifex. The enantioselective behaviors of α-HCH enantiomers were observed in T. Tubifex, with concentrations of (+)-α-HCH higher than that of (-)-α-HCH. The concentration of γ-HCH in T. Tubifex was higher than that of β-HCH and α-HCH. The existence of worms can accelerate the dissipation of HCHs in sediment, and the dissipation half-lives of α-HCH, β-HCH, and γ-HCH were 8.39, 23.90, and 3.10 days, respectively. In the elimination experiment, approximately 0.053 (37.1%), 0.074 (45.9%), and 0.042 mg/kgwwt (38.4%) α-HCH, β-HCH, and γ-HCH were depleted or excreted in T. Tubifex on the first day, respectively. The body residues in T. Tubifex were 0.084 (α-HCH), 0.082 (β-HCH), and 0.061 mg/kgwwt (γ-HCH) at the end of elimination experiment. Furthermore, the existence of T. Tubifex could affect the overlying water quality parameters.
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Toxicokinetics and oxidative stress in Tubifex Tubifex exposed to hexachlorocyclohexane isomers
RSC Advances, 2016Co-Authors: Wenjun Zhang, Zhiqiang Zhou, Li Chen, Jinling DiaoAbstract:In this study, Tubifex Tubifex (Oligochaeta, Tubificida) was exposed to hexachlorocyclohexane isomers in an aquatic environment to study the bioaccumulation and elimination of these chemicals, and oxidative stress in this organism.
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Stereoselective bioaccumulation and metabolite formation of triadimefon in Tubifex Tubifex.
Environmental science & technology, 2014Co-Authors: Tiantian Liu, Jinling Diao, Zhiqiang ZhouAbstract:Triadimefon, a chiral fungicide, could be metabolized to triadimenol which has two chiral centers. In this work, Tubifex Tubifex was exposed to triadimefon through the aqueous and soil phase to explore the relative importance of the routes of uptake. Bioaccumulation of triadimefon in Tubifex was detected in both treatments, and the kinetics of the accumulation processes were significantly different in these two experiments. In spiked water treatment, (S)-triadimefon was preferentially accumulated over the (R)-triadimefon, whereas the enantioselective bioaccumulation was not detected in the spiked soil microenvironment. Simultaneously, four stereoisomers of triadimenol were also found in the Tubifex tissue. Although the amount of these stereoisomers were different from each other with relatively more accumulation of the most fungi-toxic stereoisomer (1S,2R), the abundance ratios in the two exposure treatments were similar at the same sampling, following the order (1S,2S) > (1R,2S) > (1R,2R) > (1S,2R). The ...
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enantioselective bioaccumulation and degradation of sediment associated metalaxyl enantiomers in Tubifex Tubifex
Journal of Agricultural and Food Chemistry, 2013Co-Authors: Shanshan Di, Jinling Diao, Zhiqiang ZhouAbstract:Knowledge about the enantioselective bioavailability of chiral pesticides in aquatic organisms facilitates more accurate interpretation of their environmental behaviors. In this study, the enantioselective bioaccumulation of metalaxyl enantiomers in Tubifex Tubifex was detected in two uptake pathways. For the spike water treatment, a 16 day exposure experiment was employed and the enantiomer fractions (EFs) in Tubifex tissue were maintained approximately at 0.47 during the experiment. For the spike sediment treatment, a 14 day bioaccumulation period indicated the concentrations of (−)-(R)-metalaxyl were higher than those of (+)-(S)-metalaxyl. Therefore, the bioaccumulation of metalaxyl in worms was enantioselective for these treatments. With the presence of Tubifex, higher concentrations of metalaxyl in overlying water and lower concentrations in sediment were detected than in worm-free treatments. This means that Tubifex has positive functions in metalaxyl’s diffusion from the sediment to overlying water...
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Enantioselective bioaccumulation of soil-associated fipronil enantiomers in Tubifex Tubifex.
Journal of hazardous materials, 2012Co-Authors: Tiantian Liu, Jinling Diao, Peng Wang, Gaoxin Zhou, Zhiqiang ZhouAbstract:Enantioselective behavior of chiral pesticides in the aquatic environment has been a subject of growing interest. In this study, the enantioselective bioaccumulation of fipronil enantiomers in Tubifex Tubifex (Oligochaeta, Tubificida) was detected in both spike-water and spike-soil systems, respectively. For the spike-water treatment, a 9-day exposure experiment was employed and the enantiomer fraction in Tubifex tissue was maintained approximately at 0.58 during the experiment. In addition, a 14-day bioaccumulation period was chosen for the spike-soil treatment and a more significant deviation of enantiomer fraction from 0.5 in Tubifex tissue was detected, with concentrations of the R-form higher than that of the S-form. Therefore, the bioaccumulation of fipronil was enantioselective in Tubifex tissue for the two treatments and the magnitude of enantioselectivity may be influenced by different exposure conditions. For the spike-soil treatment, the concentrations of fipronil in verlying water and soil were also determined. With the presence of Tubifex worms, higher concentrations of fipronil in overlying water and lower concentrations in soil were detected than that in the absence of Tubifex treatment during the whole 14-day exposure period. This means that Tubifex has positive functions in fipronil's diffusion from soil to overlying water and in the degradation of the soil-associated fipronil.
Zhiqiang Zhou - One of the best experts on this subject based on the ideXlab platform.
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Selective bioaccumulation and elimination of hexachlorocyclohexane isomers in Tubifex Tubifex (Oligochaeta, Tubificidae).
Environmental science and pollution research international, 2016Co-Authors: Ledan Huang, Jinling Diao, Zhiqiang ZhouAbstract:In this study, Tubifex Tubifex worms were exposed to sediment-associated hexachlorocyclohexane (HCH) isomers to study the bioaccumulation and elimination behaviors of HCH isomers in T. Tubifex. During a 10-day bioaccumulation experiment, bioaccumulation curves of HCHs were approximate to M-type in T. Tubifex. The enantioselective behaviors of α-HCH enantiomers were observed in T. Tubifex, with concentrations of (+)-α-HCH higher than that of (-)-α-HCH. The concentration of γ-HCH in T. Tubifex was higher than that of β-HCH and α-HCH. The existence of worms can accelerate the dissipation of HCHs in sediment, and the dissipation half-lives of α-HCH, β-HCH, and γ-HCH were 8.39, 23.90, and 3.10 days, respectively. In the elimination experiment, approximately 0.053 (37.1%), 0.074 (45.9%), and 0.042 mg/kgwwt (38.4%) α-HCH, β-HCH, and γ-HCH were depleted or excreted in T. Tubifex on the first day, respectively. The body residues in T. Tubifex were 0.084 (α-HCH), 0.082 (β-HCH), and 0.061 mg/kgwwt (γ-HCH) at the end of elimination experiment. Furthermore, the existence of T. Tubifex could affect the overlying water quality parameters.
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Toxicokinetics and oxidative stress in Tubifex Tubifex exposed to hexachlorocyclohexane isomers
RSC Advances, 2016Co-Authors: Wenjun Zhang, Zhiqiang Zhou, Li Chen, Jinling DiaoAbstract:In this study, Tubifex Tubifex (Oligochaeta, Tubificida) was exposed to hexachlorocyclohexane isomers in an aquatic environment to study the bioaccumulation and elimination of these chemicals, and oxidative stress in this organism.
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Stereoselective bioaccumulation and metabolite formation of triadimefon in Tubifex Tubifex.
Environmental science & technology, 2014Co-Authors: Tiantian Liu, Jinling Diao, Zhiqiang ZhouAbstract:Triadimefon, a chiral fungicide, could be metabolized to triadimenol which has two chiral centers. In this work, Tubifex Tubifex was exposed to triadimefon through the aqueous and soil phase to explore the relative importance of the routes of uptake. Bioaccumulation of triadimefon in Tubifex was detected in both treatments, and the kinetics of the accumulation processes were significantly different in these two experiments. In spiked water treatment, (S)-triadimefon was preferentially accumulated over the (R)-triadimefon, whereas the enantioselective bioaccumulation was not detected in the spiked soil microenvironment. Simultaneously, four stereoisomers of triadimenol were also found in the Tubifex tissue. Although the amount of these stereoisomers were different from each other with relatively more accumulation of the most fungi-toxic stereoisomer (1S,2R), the abundance ratios in the two exposure treatments were similar at the same sampling, following the order (1S,2S) > (1R,2S) > (1R,2R) > (1S,2R). The ...
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enantioselective bioaccumulation and degradation of sediment associated metalaxyl enantiomers in Tubifex Tubifex
Journal of Agricultural and Food Chemistry, 2013Co-Authors: Shanshan Di, Jinling Diao, Zhiqiang ZhouAbstract:Knowledge about the enantioselective bioavailability of chiral pesticides in aquatic organisms facilitates more accurate interpretation of their environmental behaviors. In this study, the enantioselective bioaccumulation of metalaxyl enantiomers in Tubifex Tubifex was detected in two uptake pathways. For the spike water treatment, a 16 day exposure experiment was employed and the enantiomer fractions (EFs) in Tubifex tissue were maintained approximately at 0.47 during the experiment. For the spike sediment treatment, a 14 day bioaccumulation period indicated the concentrations of (−)-(R)-metalaxyl were higher than those of (+)-(S)-metalaxyl. Therefore, the bioaccumulation of metalaxyl in worms was enantioselective for these treatments. With the presence of Tubifex, higher concentrations of metalaxyl in overlying water and lower concentrations in sediment were detected than in worm-free treatments. This means that Tubifex has positive functions in metalaxyl’s diffusion from the sediment to overlying water...
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Enantioselective bioaccumulation of soil-associated fipronil enantiomers in Tubifex Tubifex.
Journal of hazardous materials, 2012Co-Authors: Tiantian Liu, Jinling Diao, Peng Wang, Gaoxin Zhou, Zhiqiang ZhouAbstract:Enantioselective behavior of chiral pesticides in the aquatic environment has been a subject of growing interest. In this study, the enantioselective bioaccumulation of fipronil enantiomers in Tubifex Tubifex (Oligochaeta, Tubificida) was detected in both spike-water and spike-soil systems, respectively. For the spike-water treatment, a 9-day exposure experiment was employed and the enantiomer fraction in Tubifex tissue was maintained approximately at 0.58 during the experiment. In addition, a 14-day bioaccumulation period was chosen for the spike-soil treatment and a more significant deviation of enantiomer fraction from 0.5 in Tubifex tissue was detected, with concentrations of the R-form higher than that of the S-form. Therefore, the bioaccumulation of fipronil was enantioselective in Tubifex tissue for the two treatments and the magnitude of enantioselectivity may be influenced by different exposure conditions. For the spike-soil treatment, the concentrations of fipronil in verlying water and soil were also determined. With the presence of Tubifex worms, higher concentrations of fipronil in overlying water and lower concentrations in soil were detected than that in the absence of Tubifex treatment during the whole 14-day exposure period. This means that Tubifex has positive functions in fipronil's diffusion from soil to overlying water and in the degradation of the soil-associated fipronil.
J.-m. Bonzom - One of the best experts on this subject based on the ideXlab platform.
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Ecotoxicity of uranium to Tubifex Tubifex worms (Annelida, Clitellata, Tubificidae) exposed to contaminated sediment
Ecotoxicology and Environmental Safety, 2009Co-Authors: S. Lagauzère, R. Terrail, J.-m. BonzomAbstract:In freshwater ecosystems, sediments act as an accumulation compartment for metallic pollutants as uranium. However, they are also the habitats of numerous benthic macroinvertebrates that directly influence the structure and functioning of such environments. Consequently, these organisms could be affected by uranium. This laboratory study aimed to assess the ecotoxicity of uranium on Tubifex Tubifex through 12-day exposure to contaminated sediment (0-5980 μg U g-1 dry wt). At high concentrations (>599 μg U g-1 dry wt), malformations were observed, and survival, biomass and burrowing activity were all reduced. This relative high resistance in polluted environments can be explained mainly by the implementation of several processes as autotomy, regeneration ability, increased production of mucus, a hormetic effect on biomass and a probable strategy for avoiding the contaminated sediment. This study represents the first assessment of uranium impact on T. Tubifex at realistic concentrations in sediments near mining sites. © 2008 Elsevier Inc. All rights reserved.
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Ecotoxicity of uranium to Tubifex Tubifex worms (Annelida, Clitellata, Tubificidae) exposed to contaminated sediment.
Ecotoxicology and environmental safety, 2008Co-Authors: S. Lagauzère, R. Terrail, J.-m. BonzomAbstract:In freshwater ecosystems, sediments act as an accumulation compartment for metallic pollutants as uranium. However, they are also the habitats of numerous benthic macroinvertebrates that directly influence the structure and functioning of such environments. Consequently, these organisms could be affected by uranium. This laboratory study aimed to assess the ecotoxicity of uranium on Tubifex Tubifex through 12-day exposure to contaminated sediment (0-5980 microg U g(-1) dry wt). At high concentrations (>599 microg U g(-1) dry wt), malformations were observed, and survival, biomass and burrowing activity were all reduced. This relative high resistance in polluted environments can be explained mainly by the implementation of several processes as autotomy, regeneration ability, increased production of mucus, a hormetic effect on biomass and a probable strategy for avoiding the contaminated sediment. This study represents the first assessment of uranium impact on T. Tubifex at realistic concentrations in sediments near mining sites.
