Fig. 5.

Aqueous buoyant separation of extracellular hydrocarbons from the Botryococcus biomass following sonication of (a) Botryococcus braunii var. Showa, and (b) Botryococcus braunii Kawaguchi-1. A 10–80% (w/v) sucrose gradient was employed with a 10% increment among the gradient steps