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341.
342.
In recent years, particular attention was paid to the long-lived radionuclides discharged with authorized low-level radioactive liquid and gaseous effluents by the nuclear spent fuel reprocessing plants of La Hague and Sellafield. The knowledge of (129)I (half-life=15.7 x 10(6) a) distribution in the environment is required to assess the radiological impact to the environment and population living in the area under the direct influence of La Hague NRP discharges. Measurement difficulties of (129)I in environmental matrices, where it is usually present at trace level, limited data published on (129)I activity levels in the European and more particularly in the French territory. Studies conducted to qualify a new alternative measurement method, direct gamma-X spectrometry with experimental self-absorption correction, led to test samples collected in the La Hague marine and terrestrial environment : seaweeds, lichens, grass, bovine thyroids, etc. All these results, often already published separately for analytical purposes and treated for intercomparison exercises, are presented here together in a radioecological manner. The levels of (129)I activity and (129)I/(127)I ratios in these samples show the spatial and temporal influence of the La Hague NRP in its local near-field environment as well as at the regional scale along the French Channel coast. 相似文献
343.
Densely packed granular inclusions composed of opal filaments were observed in two types of cells in the ascidianStyela clava. Herdman, 1881: oocyte test cells and cells of the interstitial ovarian tissue. Cytochemical analysis, scanning electron microscopy, transmission electron microscopy and microanalysis were used to study the cytology of the ovarian cells. The inclusions consist of intracellular filaments in which silica is bound to proteins. The role of this silica accumulation, very uncommon in invertebrates, is unknown. However, the silica granules are obviously closely related to the acid mucopolysaccharides in which they are embedded. Deposition of silica is linked to the seasonal reproductive cycle, and forms in the interstitial tissue and in the maturing oocytes successively. A taxonomic significance of the silica granules is suggested. 相似文献
344.
McCune Frédéric Samson-Robert Olivier Rondeau Sabrina Chagnon Madeleine Fournier Valérie 《Environmental science and pollution research international》2021,28(14):17573-17586
Environmental Science and Pollution Research - Water is essential for honey bees (Apis mellifera L.), but contaminated sources of water in agricultural environments represent a risk of exposure to... 相似文献
345.
Environmental Fluid Mechanics - For centuries, the interaction between the transport and hydrographic networks represents a significant issue in a country such as France. For example, the French... 相似文献
346.
Gimbert F de Vaufleury A Douay F Scheifler R Coeurdassier M Badot PM 《Environment international》2006,32(7):866-875
To enlarge the possibilities of using organisms of the soil fauna to assess the bioaccumulative potential of chemicals, the kinetic of soil cadmium (Cd) transfer to the terrestrial gastropod Helix aspersa was investigated under laboratory conditions during a long-term experiment (6 months). During the exposure phase (3 months), juvenile snails were subjected to three different concentrations of Cd spiked in artificial ISO soil (ISO 0, 20 and 100 mg Cd kg(-1)) and to a field soil (ME4) industrially contaminated by 20 mg Cd kg (-1). For both soils, internal steady-state Cd concentrations were reached in the viscera of the snails, the main storage organ for Cd, after 2 weeks of exposure whatever the Cd concentration in soil. The equilibrium concentrations in the viscera were 0.7 (+/-0.1), 11.3 (+/-2.4), 73.3 (+/-4.8) and 6.3 (+/-1.3) mg Cd kg(-1) dry mass for ISO 0, ISO 20, ISO 100 and ME4, respectively. During the depuration phase (3 months), from 0 to 52% of the accumulated Cd in the viscera were removed by excretion or relocation in the foot. However, the snails were not able to depurate down to initial concentrations. Data were modelled by integrating a specific growth rate constant into one-compartment toxicokinetic models. This allowed the calculation of Cd uptake rates that can be used as indicators of metal bioavailability. Since this parameter was found to be lower for snails exposed to the field soil ME4, we concluded that lower Cd bioavailability in this field soil was responsible of the lower transfer to the snails compared to the ISO 20 soil, even though they were polluted to similar extents. Internal validation showed that the toxicokinetic models could be applied for predictive purposes, promising for the development of a bioaccumulation directive for terrestrial environment. 相似文献
347.
Bertin Philippe N. Crognale Simona Plewniak Frédéric Battaglia‑Brunet Fabienne Rossetti Simona Mench Michel 《Environmental science and pollution research international》2022,29(7):9490-9490
Environmental Science and Pollution Research - 相似文献