sentence: On day 10 at 15 ° C , Asteroplanus karianus , Nitzschia longissima , Ditylum brightwellii , and Chaetoceros didymus displayed higher cell growth with cell densities of 26.8 × 10 ( growth rate 0.05 ± 0.01 day ) , 18.8 × 10 ( growth rate 0.04 ± 0.02 day ) , 20.1 × 10 ( growth rate 0.05 ± 0.03 day ) , and 18 × 10 cell mL ( growth rate 0.05 ± 0.02 day ) , respectively ( Fig. 2a , b ) .