410 



George Hoch and Olga v. H. Owens 







02 



UPTAKE 

 -20 



10 20 30 40 50 

 RELATIVE INCIDENT INTENSITY 



The increased oxygen uptake occurs at short wavelengths 

 in both blue-green and green algae. The magnitude of the 

 increase is variable from one culture to another, doubtless 

 depending on the prior history of the cells. The increased 

 uptake has an irregular response to light intensity, as it 

 generally does not start until sufficient intensity to com- 

 pensate dark respiration (or somewhat more) has been given. 

 At intensities below this point, oxygen uptake does not 

 change or is slightly inhibited. This increased uptake can 

 also lead to a small break in the net gas exchange curve. 



Effect of Cyanide on Oxygen Uptake and Production . 



It has been known for some time that the effect of 

 cyanide on respiration and photosynthesis varies with the 



