976 



TflE LIGHT FACTOE. I. INTENSITY 



CHAP. 28 



i 1.45 X 10* 



INTENSITY, erg/cm sec 



Fig. 28.9E. Light curves of Chlorella cells showing O2 

 effect (after Wassink, Vermeulen, Reman and Katz 1938). 



250 - 



200 - 



E 

 E 



z" 



o 



o 

 > 



LlJ 



250 - 



200 



o without cyanide 

 A 0003% KCN 



3 xlO" 

 INCIDENT INTENSITY, erg/cm.^ sec. 



3 xlO* 



Fig. 28.10. Light curves of inhibited diatoms (Nitzschia) at 25° C. in Warburg 

 buffer No. 9, showing both ethylurethan and cyanide (?) to be effective at low light 

 intensities (after Wassink and Kersten 1945). 



