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Mottola Filomena Santonastaso Marianna Iovine Concetta Frenzilli Giada Picchietti Simona Genualdo Viviana Rocco Lucia 《Environmental science and pollution research international》2022,29(41):62208-62218
Environmental Science and Pollution Research - The increased titanium dioxide nanoparticles (TiO2-NPs) spread and their interaction with organic and inorganic pollutants arouses concern for the... 相似文献
33.
Persistent organochlorine compounds in soils and sediments of European high altitude mountain lakes 总被引:20,自引:0,他引:20
Grimalt JO van Drooge BL Ribes A Vilanova RM Fernandez P Appleby P 《Chemosphere》2004,54(10):1549-1561
The composition of persistent organochlorine compounds (OC) in soils and sediments from two high altitude European mountain lakes, Redon in the Pyrenees and Ladove in the Tatra mountains, has been studied. Sediment cores from two additional lakes in the Tatra mountains, Starolesnianske Pleso and Dlugi Staw, have also been examined. DDTs (1.7-13 ng g(-1)) were the most abundant OC in soils followed by total polychlorobiphenyls (PCBs; 0.41-1.5 ng g(-1)) and hexachlorobenzene (HCB; 0.15-0.91 ng g(-1)). In sediments, the dominant OC were also DDTs (3.3-28 ng g(-1)) and PCBs (2.3-15 ng g(-1)). These concentrations are low, involving absence of major pollution sources in these high mountain regions. The downcore OC profiles in soils and sediments were similar but higher concentrations and steeper vertical gradients were observed in the latter. Radiometric determinations showed absence of significant OC transport from catchment to lake. The sediment-soil difference points therefore to a better retention of the OC load in sediments than soils which may be related to the low temperatures that are currently encountered at the bottom of the lake water column and the depletion of sediment bioturbation in these cold environments. Significant qualitative changes in the soil PCB distributions are observed downcore. These involve a dominance of the high molecular weight congeners in the top core sections and those of lower weight (i.e. less chlorinated) in the bottom. Anaerobic dechlorination of higher molecular weight congeners occurring in microsites, e.g. as observed in flooded or poorly drained soils, could be responsible for these changes. This process could be concurrent to bioturbation. 相似文献
34.
Jurgen Garbrecht Glenn P Fernandez 《Journal of the American Water Resources Association》1994,30(2):297-306
ABSTRACT: Small systematic changes in climatic records are often poorly visualized by standard time series plots because they are usually hidden by the magnitude and variability of the data values themselves. A visualization approach based on the rescaled adjusted partial sums (RAPS) which overcomes the above-stated shortcomings is presented. This visualization highlights trends, shifts, data clustering, irregular fluctuations, and periodicities in the record. Additional information on the number, magnitude, shape, frequency, and timing of fluctuations and trends can also be inferred. The visualization approach can be used for preliminary visual inspection of a time series, to gain a feel for the data, and/or to guide and focus subsequent statistical tests and analyses. It is not intended as a substitute for standard statistical analysis. Alternatively, the visualization approach can be used to display findings of a time series analysis. The capabilities and limitations of the approach are discussed and illustrated for two time series of annual rainfall values. 相似文献
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This paper discusses the case of a pregnant woman with polychemotherapy during the second trimester of pregnancy for rhabdomyosarcoma of the face and cessation of fetal growth with disappearance of amniotic fluid after the first course of therapy. 相似文献
37.
Variability of the frequency of male neoteny in Ostrea puelchana (Mollusca: Bivalvia) 总被引:1,自引:0,他引:1
Ostrea puelchana (D'Orbigny), a larviparous oyster from the Atlantic coast of South America, comprises two types of individuals: (1) adults which live for several years and become sexually developed after one year, these show a rhythmic successive hermaphroditism with male, hermaphroditic and female phases; (2) neotenic individuals settled on the adults, which live for only about one year and function exclusively as males. Adult oysters were collected in February 1982 from a natural bed in the San Matias Gulf, Argentina, and were transferred to two sites 200 km to the south of their original habitat, where they were maintained under culture conditions. At the beginning of the study, 17% of adult oysters were observed bearing neotenic individuals. After two years, the number of adults in the female phase had decreased, and neotenic individuals had entirely disappeared. The presence of female-phase adults would seem to be necessary for the existence of neotenic males. Further analysis of the results revealed high adult density to be directly associated with greatly decreased numbers of adults in the female phase; this may play a role in the decrease of neotenic individuals. 相似文献
38.
Dr. D. F. Callen H. Fernandez Y. J. Hull J. M. Svigos H. M. Chambers G. R. Sutherland 《黑龙江环境通报》1991,11(7):437-442
A predominantly triploid 69,XXY placenta was found associated with a normal 46,XX infant. Therefore, a triploid placenta is apparently capable of supporting normal fetal development. The chromosome and pathological results support the conclusion that the triploid placenta originates from a ‘vanishing twin’ pregnancy. This case is unusual in that persistence of the placenta from the vanished twin has virtually replaced most of the normal placenta. 相似文献
39.
Adrian A. Farías Laura N. Mojsiejczuk María B. Pisano Fernando S. Flores Juan J. Aguilar Ana N. Jean Laura A. Yanes Gisela Masachessi Veronica E. Prez María B. Isa Rodolfo H. Campos Viviana E. Ré Silvia V. Nates 《Food and environmental virology》2018,10(1):121-126
Environmental surveillance is an effective approach to investigate the circulation of human enteroviruses in the population. Enteroviruses E14, CVA9, E-6, E16, E20, E25, E13, and CVA24 were detected in sewage and a watercourse in central Argentina. E14 was the most frequent serotype and was found for the first time in environmental samples in our region. Phylogenetic and coalescence analyses showed at least two recent introduction events. 相似文献