Abstract
After 168 h growth in the presence of 1 μg ml −1 DDT, cells of Chlorella fusca were harvested and their cellular composition determined. DDT caused a decrease in cell size of 46% when measured by biovolume and 43% when based on dry weight. However, the amount of DNA, RNA, and protein per cell was unaffected by the insecticide. The change in cell size was accounted for by decreased content of fatty acids (55%), chlorophyll a (47%) and other cellular components, which were presumed to be mostly storage and cell wall polymers, (48%). There were marked differences in total fatty acid content of the neutral lipid, glycolipid and phospholipid fractions and some dramatic changes in fatty acid composition of the glycolipids and phospholipids. In particular the C 16:1 fatty acid, which in control cells accounted for over one third of the phospholipid fatty acids, almost disappeared from DDT treated cells. Additionally there was a marked increase in C 14 fatty acids in both the glycolipid and phospholipid fractions.
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