Littérature scientifique sur le sujet « Terres rares – Toxicologie »
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Articles de revues sur le sujet "Terres rares – Toxicologie"
LÉVÊQUE, Alain, et Patrick MAESTRO. « Terres rares ». Opérations unitaires. Génie de la réaction chimique, septembre 1993. http://dx.doi.org/10.51257/a-v1-j6630.
Texte intégralAUZEL, François. « Propriétés optiques des terres rares ». Optique Photonique, mai 1998. http://dx.doi.org/10.51257/a-v1-e1980.
Texte intégralQueirós, Libânia, Nuno Aguiar, Patrícia Pereira, Fernando J. M. Gonçalves, Artur Alves et Joana Luísa Pereira. « Recommended rates of azoxystrobin and tebuconazole seem to be environmentally safe but ineffective against target fungi ». Ecotoxicology, 18 janvier 2023. http://dx.doi.org/10.1007/s10646-023-02619-w.
Texte intégralThèses sur le sujet "Terres rares – Toxicologie"
Fleurbaix, Emmanuel. « Évaluation écotoxicologique des éléments terres-rares : approches cellulaires chez différentes espèces aquatiques ». Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0324.
Texte intégralSince 30 years ago, the growing use of Lanthanides in new technologies has contributed to important releases of these metals into aquatic ecosystems. In a global sustainable development policy aimed at preserving the quality of ecosystems, the impact of Lanthanides on aquatic organisms has naturally been questioned. However, studies on the aquatic ecotoxicology of Lanthanides are incomplete, and no consensus is established yet. In this context, we studied the cellular toxicity of Lanthanides individually and in mixtures. To determine these toxic effects, cell viability was measured on Danio rerio fibroblast-like cells (ZF4; ATCC®, CRL-2050™), Danio rerio hepatic cells (ZFL; ATCC®, CRL-2643™), Oncorhynchus mykiss epithelial cells (RTgill-W1; ATCC®, CRL-2523™), and primary culture of Corbicula fluminea digestive glands exposed to Lanthanides. Direct toxicity of Lanthanides has been observed on all cellular models. Concerning the toxicity of Lanthanides in mixtures, synergistic effects have been underlined on the three fish cell lines. In this research, we focused on the mechanisms of the detoxification of Lanthanides in the case of ZF4 cells from Danio rerio. The effects of Lanthanides were assessed in the presence of specific inhibitors of glutathione-S-transferases (ethacrynic acid) and MRP-like (MK571 and probenecid), by cell viability measurements. We decided to study these actors of the cellular detoxification due to their respective roles in phases II and III of the cellular detoxification of metals in fishes and bivalves. Regarding the results, MRP-like proteins are effectively involved in the detoxification of Lanthanides in ZF4 cells. Overall, our results highlighted the relevance of the toxic effects of Lanthanides at the cellular level for the risk assessment of these metals
Lachaux, Nicolas. « Impacts écotoxicologiques d’éléments terres rares à différents niveaux d’organisation biologique dans un réseau d’eau douce : approches intégrées en mésocosmes indoor ». Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0330.
Texte intégralRare earth elements (REE) are a group of seventeen metals composed of the lanthanide series, yttrium and scandium, which share similar physicochemical properties. They have diverse applications, including in hi-tech and green energy areas. Mining, industrial, medical, agricultural activities and wastewater treatment plant (WWTP) release REE in aquatic systems. This raises environmental concerns on their potential toxicity towards aquatic organisms, which is still poorly understood. The main objective of the thesis was to analyse speciation, bioaccumulation and biological effects of different REE on several key freshwater species to allow a reliable environmental risk assessment of REE. Three representative REE have been tested individually and in mixture: neodymium (Nd), gadolinium (Gd) and ytterbium (Yb). A complementary approach combining microcosms (standard tests) and mesocosms afforded to study their toxicity at several levels of biological organization in five species belonging to different trophic levels: a unicellular alga Raphidocelis subcapitata, a macrophyte Myriophyllum spicatum, a crustacean Daphnia magna, a bivalve Corbicula fluminea and a fish Danio rerio. Fate, speciation and bioaccumulation of REE in different exposure media (with and without dissolved organic matter = DOM; with different forms of phosphorous = P) were studied by modelling and measuring REE concentrations in the medium and in the organisms to better understand the observed biological effects. The results demonstrate strong links between speciation, bioaccumulation and toxicity shown by a decrease of toxicity and/or bioaccumulation of Nd, Gd and Yb in all studied species in the presence of DOM and inorganic phosphorous, which complexed and precipitated with REE reducing their bioavailability. These results highlight that it is essential to consider speciation, by using measured dissolved concentrations and replacing inorganic P by organic P, in order to prevent an underestimation of REE toxicity. Nd, Gd and Yb were significantly accumulated in studied species, leading to harmful effects at individual and subindividual levels. Internal distribution of Nd, Gd and Yb and several effects indicated that elementary homeostasis and osmoregulation disturbance is a relevant toxic mechanism of REE. The three REE induced additive mixture effects regardless of the type of species or exposure medium. Taking into account all these results and the fact that REE occur in mixtures in the environment, we propose an original approach by assessing environmental risk of REE in mixture instead of individually. The threshold concentration of REE mixture was determined at 3.2 µg L-1 by using the species sensitivity distribution (SSD) approach. The calculated risk from tests with individual organisms and the SSD together with results from a mesocosm experiment testing different species at three trophic levels show that current mining and industrial releases could strongly affect all trophic levels in aquatic ecosystems, especially primary producers. At present, WWTP effluents should pose a limited risk. However, we demonstrated that Gd, in constrat-agent form used in medicine, can be accumulated and provoke direct effects on aquatic organisms. The environmental risk of REE is currently restricted to some hotspots but it may get higher and more widespread in the future because of the increasing REE uses and releases
Livres sur le sujet "Terres rares – Toxicologie"
Pagano, Giovanni. Rare Earth Elements in Human and Environmental Health : At a Crossroads Between Toxicity and Safety. Taylor & Francis Group, 2016.
Trouver le texte intégralPagano, Giovanni. Rare Earth Elements in Human and Environmental Health : At the Crossroads Between Toxicity and Safety. Jenny Stanford Publishing, 2016.
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