Fig. 2
From: UV radiation limited the expansion of cyanobacteria in early marine photic environments
Viability of UV-C irradiated Synechococcus cultures. Cultures grown at varying Fe(III) (0 mM, 0.15 mM, 0.35 mM, and 0.55 mM) and Si concentrations (white bar: 0.2 mM Si; light gray bar: 0.6 mM Si; dark gray bar: 2.0 mM Si) and irradiated with UV-C (254 nm) at 500 J/m2 were assessed by colony forming units (CFU) counts. Cultures grown at 0.55 mM Fe(III) and 0.2 mM Si died (horizontal line). Viability was calculated for cultures grown in triplicate in three biological replicates. Error bars represent standard deviation at 2σ uncertainty. Dashed line represents % survival in un-supplemented A+ growth medium
