FIG. 4.

Caldarchaeol-derived biphytanes from diverse marine samples. Compounds correspond to the structures shown in Fig. 3, as identified by comparison to known standards. Relative abundances of cyclic and acyclic biphytanes in diverse marine samples are shown. The value for most abundant of the four components was arbitrarily set at a relative value of 1. BS, Black Sea sediment; Antarctic, Antarctic picoplankton lipids; C. symbiosum, C. symbiosum lipids; SMB3 and SMB4, Santa Monica Basin suspended particulate lipid samples.