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341.
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
342.
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
343.
Schneider Tobias Musa Bandowe Benjamin A. Bigalke Moritz Mestrot Adrien Hampel Henrietta Mosquera Pablo V. Fränkl Lea Wienhues Giulia Vogel Hendrik Tylmann Wojciech Grosjean Martin 《Environmental science and pollution research international》2021,28(13):16227-16243
Environmental Science and Pollution Research - Historical records of trace elements in lake sediments provide source-to-sink information about potentially toxic pollutants across space and time. We... 相似文献
344.
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
345.
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
346.
The degradation of bitertanol by ozone treatment is investigated. Solutions of bitertanol (8.4 μg mL?1) were prepared either by dissolution of the standard or by dilution of Gaucho Blé seed loading solution and then ozonated under different conditions. Evolution of the concentrations of bitertanol and its ozonation by-products in both solutions was monitored by HPLC–UV as a function of the treatment time for a concentration of 100 g m?3 of ozone in the inlet gas. Bitertanol degradation was found to follow a pseudo-first order reaction in both cases. However, the rate of the reaction in diluted seed loading solution was much lower (0.19 vs. 0.27 min?1 in standard solution) and was close to the reaction rate observed in the presence of a radical scavenger, tert-butanol (0.11 min?1). Thus, it may be suggested that additives present in the seed loading solution may play the role of radical scavengers. Study of ozone concentration in the inlet gas (from 25 to 100 g m?3) showed that ozone degradation is also a first-order reaction with respect to ozone. Four ozonation by-products were highlighted, collected and identified by HPLC coupled with an ion trap mass spectrometer using positive electrospray ionization mode. A degradation pathway of bitertanol was finally proposed. 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