Fig. 2
From: Advantageous characteristics of the diatom Chaetoceros gracilis as a sustainable biofuel producer
Changes in concentrations of three nutrient salts during the course of diatom growth. C. gracilis grown in F/2-enriched 1% NaCl medium without vitamins, and concentrations of nitrate (closed boxes), silicate (closed diamonds), and phosphate (open boxes) determined at indicated times after cell removal by centrifugation; values normalized at day 0; initial concentrations were 50.0, 16.4, and 2.26 ppm for nitrate, silicate, and phosphate, respectively; and some error bars smaller than symbols (n = 3)