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51.
Razafimahefa Ravo M. Ludwig-Begall Louisa F. Diallo Mamadou Amadou Dewals Benjamin G. Vanderplasschen Alain Nivelles Olivier Deketelaere Caroline Mauroy Axel Thiry Etienne 《Food and environmental virology》2021,13(4):493-506
Food and Environmental Virology - Human noroviruses impose a considerable health burden globally. Here, a flow cytometry approach designed for their detection in biological waste and food samples... 相似文献
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53.
Prenatal diagnosis in a pregnancy at risk for a juvenile B1 variant of GM2-gangliosidosis was carried out. The biochemical study of the cultured amniocytes and the affected fetal brain is reported. The results obtained show that the sulphated artificial substrate can be used in the diagnosis of B1 variant, but not the neutral one. The accumulation of GM2-ganglioside in the fetal brain of the B1 juvenile form and an infantile form of GM2-gangliosidosis (0 variant) was compared. 相似文献
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José Antonio Rodríguez Martín Nikos Nanos José Carlos Miranda Gregoria Carbonell Luis Gil 《Die Naturwissenschaften》2013,100(8):739-747
Mercury (Hg) is a toxic element that is emitted to the atmosphere by both human activities and natural processes. Volcanic emissions are considered a natural source of mercury in the environment. In some cases, tree ring records taken close to volcanoes and their relation to volcanic activity over time are contradictory. In 1949, the Hoyo Negro volcano (La Palma-Canary Islands) produced significant pyroclastic flows that damaged the nearby stand of Pinus canariensis. Recently, 60 years after the eruption, we assessed mercury concentrations in the stem of a pine which survived volcano formation, located at a distance of 50 m from the crater. We show that Hg content in a wound caused by pyroclastic impacts (22.3 μg kg?1) is an order of magnitude higher than the Hg concentrations measured in the xylem before and after the eruption (2.3 μg kg?1). Thus, mercury emissions originating from the eruption remained only as a mark—in pyroclastic wounds—and can be considered a sporadic and very high mercury input that did not affect the overall Hg input in the xylem. In addition, mercury contents recorded in the phloem (9.5 μg kg?1) and bark (6.0 μg kg?1) suggest that mercury shifts towards non-living tissues of the pine, an aspect that can be related to detoxification in volcanism-adapted species. 相似文献
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In this field study, two approaches to assess contaminant mass discharge were compared: the sampling of multilevel wells (MLS) and the integral groundwater investigation (or integral pumping test, IPT) that makes use of the concentration-time series obtained from pumping wells. The MLS approached used concentrations, hydraulic conductivity and gradient rather than direct chemical flux measurements, while the IPT made use of a simplified analytical inversion. The two approaches were applied at a control plane located approximately 40m downgradient of a gasoline source at Canadian Forces Base Borden, Ontario, Canada. The methods yielded similar estimates of the mass discharging across the control plane. The sources of uncertainties in the mass discharge in each approach were evaluated, including the uncertainties inherent in the underlying assumptions and procedures. The maximum uncertainty of the MLS method was about 67%, and about 28% for the IPT method in this specific field situation. For the MLS method, the largest relative uncertainty (62%) was attributed to the limited sampling density (0.63 points/m(2)), through a novel comparison with a denser sampling grid nearby. A five-fold increase of the sampling grid density would have been required to reduce the overall relative uncertainty for the MLS method to about the same level as that for the IPT method. Uncertainty in the complete coverage of the control plane provided the largest relative uncertainty (37%) in the IPT method. While MLS or IPT methods to assess contaminant mass discharge are attractive assessment tools, the large relative uncertainty in either method found for this reasonable well monitored and simple aquifer suggests that results in more complex plumes in more heterogeneous aquifers should be viewed with caution. 相似文献
58.
Rajeh Caroline Saoud Imad P. Kharroubi Samer Naalbandian Salpy Abiad Mohamad G. 《Journal of Material Cycles and Waste Management》2021,23(1):1-17
Journal of Material Cycles and Waste Management - While society struggles to meet increasing food demand and mitigate food security challenges, approximately one-third of the food produced globally... 相似文献
59.
Jayasinghe Randika Liyanage Nilmini Baillie Caroline 《Journal of Material Cycles and Waste Management》2021,23(2):557-565
Journal of Material Cycles and Waste Management - The key aim of a transition to a Green Economy is to enable economic growth and investment while increasing environmental quality and social... 相似文献
60.
We tested whether ingesting toxic algae by heterotrophic prey affected their nutritional value to crab larval predators, using
toxic algal strains that are either ingested directly by larval crabs or rejected by them. Ingestion of toxic strains of the
dinoflagellates Alexandrium
andersoni and A. fundyense by the rotifer Brachionus
plicatilis was confirmed. Rotifers having ingested either algal type for five days were fed to freshly hatched larvae of three crab
species, with larval survival and stage durations determined. For both algal/rotifer treatments in all three crab species,
larvae fed algae directly died during the first zoeal stage, while those fed rotifers that had been fed either algal strain
survived to the experiment’s end (zoeal stage 3). Survival was lower, and stage duration longer, for larvae fed rotifers cultured
on toxic algae when compared to those fed non-toxic algae. The role of toxic algae in the planktonic food web may be influenced
by its direct or indirect ingestion by larval crabs. 相似文献