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Branimir?Jovan?i?evi?Email author Predrag?Poli? Miroslav?Vrvi? Georg?Scheeder Manfred?Teschner Hermann?Wehner 《Environmental Chemistry Letters》2003,1(1):73-81
Investigations presented in this paper were aimed at defining the alterations of n-alkane composition in cases of oil-polluted alluvial sediments. Therefore, oil-polluted groundwater samples, taken in five
different time intervals during a period of 28 months, were investigated. Samples of alluvial sediments were taken from two
boreholes within an oil refinery at Pancevo, Yugoslavia. In both boreholes significant alterations with characteristic degradation
of "oil" n-alkanes with no odd- or even-member predominance were observed, as well as subsequent synthesis of new ones with pronounced
even-member predominance, and with maxima at C16 and C18. Since no additional contamination of boreholes was observed by analyses of steranes and triterpanes, the observed changes
can only be attributed to microbial activity. It is assumed that for the degradation of oil n-alkanes, as well as for the synthesis of "new" n-alkanes, algae such as dinoflagellates are responsible. This assumption was confirmed by identification of n-alcohols with even-member predominance (C14–C20), by identification of cholesterol, as well as of n-fatty acids with even-member predominance (C14–C18) in the extract with n-alkane even-member predominance.
Electronic Publication 相似文献
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Hermann J. Jordan 《Die Naturwissenschaften》1927,15(48-49):937-942
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Benthic epifauna in three areas of the northern North Sea was studied from 1999 to 2007 to investigate the effect of temperature
changes on community structure and species abundance and biomass. Abundance and/or biomass of 16 epifauna species was significantly
correlated with temperature anomalies of the mean sea surface temperature (SST) from 1971 to 2000. The response of species
to SST changes was different in the study areas depending on species life history and, most likely on food supply, which in
turn is strongly influenced by the timing and duration of primary production and regional hydrographical conditions (e.g.
stratification). Also, changes in community structure were obvious in the three areas between 2002 and 2003 coinciding with
high temperature anomalies and SST. On the other hand, these changes were mainly caused by the variability in abundance of
dominant species and altogether no clear trends in community structure were found. In contrast to epifauna communities in
the shallow southern North Sea temperature changes in the northern North Sea affected only single epifauna species until now. 相似文献