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To investigate the effect of bacterial diagenesis on the distributions of algal lipids, the marine haptophyte Emiliania huxleyi was incubated with estuarine sediment slurries under defined conditions (oxic, sulfate reducing and methanogenic). Rapid initial degradation of lipids corresponded to increased bacterial populations, both of which subsequently declined. Under oxic conditions the algal C ...
The abundances of long-chain alkenones and alkyl alkenoates are reported for a suite of surface sediments from the NE Atlantic (0°-75°N). Despite the differing conditions of their biologies and differing extents of water column degradation and of early diagenesis in the sediments, the degree of unsaturation of the alkenones (e.g. the U k37 parameter), and the relative proportion...
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