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Mechanistic studies of the bioaccumu...

Jabusch, Thomas Walter.

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Mechanistic studies of the bioaccumulation of polychlorinated biphenyls in phytoplankton.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Mechanistic studies of the bioaccumulation of polychlorinated biphenyls in phytoplankton./
作者:	Jabusch, Thomas Walter.
面頁冊數:	175 p.
附註:	Adviser: Deborah L. Swackhamer.
Contained By:	Dissertation Abstracts International63-07B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3056372
ISBN:	0493746854

Mechanistic studies of the bioaccumulation of polychlorinated biphenyls in phytoplankton.
Jabusch, Thomas Walter.

Mechanistic studies of the bioaccumulation of polychlorinated biphenyls in phytoplankton. - 175 p.

Adviser: Deborah L. Swackhamer.

Thesis (Ph.D.)--University of Minnesota, 2002.

*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Windows 95/98; Microsoft Office; Imaging Preview.

ISBN: 0493746854Subjects--Topical Terms:

545717
Biogeochemistry.

Mechanistic studies of the bioaccumulation of polychlorinated biphenyls in phytoplankton.
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100 1 $a Jabusch, Thomas Walter. $3 1251746
245 1 0 $a Mechanistic studies of the bioaccumulation of polychlorinated biphenyls in phytoplankton.
300 $a 175 p.
500 $a Adviser: Deborah L. Swackhamer.
500 $a Source: Dissertation Abstracts International, Volume: 63-07, Section: B, page: 3208.
502 $a Thesis (Ph.D.)--University of Minnesota, 2002.
520 $a *This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Windows 95/98; Microsoft Office; Imaging Preview.
520 $a Bioaccumulation in phytoplankton is the least understood foodweb transfer link for polychlorinated biphenyls (PCBs) from water to fish. The focus of this study was on three main aspects of the mechanism of bioaccumulation in phytoplankton that are highly relevant to assessing foodweb model assumptions and reducing modeling uncertainty. First, the use of the octanol/water coefficient (<italic>K</italic>ow) for predicting accumulation of PCBs in phytoplankton neutral and polar lipids was assessed. Partitioning of polychlorinated biphenyls (PCBs) in octanol/water (<italic>K</italic>ow), triolein/water (<italic>K</italic>tw) and membrane/water (<italic>K</italic> mw) systems was found to be similar but not equal. The <italic>K</italic> mw of some PCB congeners exceed both <italic>K</italic>ow and <italic>K</italic>tw by an order of magnitude. The <italic> K</italic>tw values are greater than predicted by <italic>K</italic> ow by an average factor of 1.6. Secondly, the subcellular accumulation of PCBs was investigated in the green alga <italic>Chlamydomonas reinhardtii </italic>. Accumulation of PCBs in thylakoids, an internal lipid pool, approached equilibrium on a time scale of 3–7 days. However, super-hydrophobic PCBs (<italic>K</italic>ow > 6) were not restricted from entering the cell. Extracellular sorption to the cell wall accounted for less than 10% of PCB cell contents. The results can be explained with a mechanism where PCBs readily enter both peripheral lipids (e.g the cell membrane) and internal lipids (e.g. thylakoids), but where redistribution between cellular lipid pools is slower than uptake from water to peripheral lipids. Finally, the importance of the surface-to-volume ratio (SA/V ratio) and other morphometric parameters for the bioaccumulation of PCBs was examined in batch cultures of seven algal species. There was no correlation between the SA/V ratio in algae and the dry-weight based bioaccumulation factor (BAFdw) before or at equilibrium. Instead, higher biomass per mL was negatively correlated with the BAFdw before equilibrium was reached.
520 $a The results imply that (a) PCBs have a higher affinity for phospholipid membranes than predicted by <italic>K</italic>ow; (b) PCBs accumulate in algal cells on a time scale of days to weeks but are not sterically restricted from entering the cell; and (c) the time to equilibrium for PCBs in phytoplankton increases with greater biomass density.*
590 $a School code: 0130.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Biology, Limnology. $3 1018638
650 4 $a Environmental Sciences. $3 676987
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710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 63-07B.
790 $a 0130
790 1 0 $a Swackhamer, Deborah L., $e advisor
791 $a Ph.D.
792 $a 2002
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