nl20 



1.0 1.5 2.0 

 Sl02 (G L-') 



Figure 5. The effect of increasing concen- 

 trations of silicon dioxide on 

 carbon assinilation of Monoahrysis 

 lutheri. 



2,500 r 



tIOO 



0.2 0.4 0.6 0.8 1.0 

 <l5/xm S1O2 (G u-') 



Figure 6. The effect of increasing concentra- 

 tions of silicon dioxide (all parti- 

 cles <15 micrometers) on carbon 

 assimilation of Chtorella sp. 



14 



