Abstract
Isoprenoid glycerol dialkyl glycerol tetraethers (GDGTs) are specific membrane lipids derived from archaea, one of the
three domains of life. These lipids can be used as biomarkers in paleo-ecological studies. GDGTs can be analyzed by high
performance liquid chromatography (HPLC)/mass spectrometry (MS). To quantify GDGTs, external standard curves
were run monthly on the
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