ABSORPTION SPECTRUM CHANGES 



91 



t 



■ off- 



_L 



-on- 



I 2 3 



Time (Minutes) 



Fig. 1 . Time course of transmission of Chlorella at 525 m^ during direct illumi- 

 nation. O.D. densit}^ about 0.8; light intensity (red) about 400 foot-candles. 

 Temperature, 25 °C. 



i:oo 



60 



LIGHT INTENSITY Fool Candles 



Fig. 2. Light intensity dependence of absorption spectrum changes at 525 mju 

 during the induction peak (right figure) and at steady state (left figure). Note 

 difference in light intensity scales. Transmission change in arbitrary units. Red 

 light, direct cross illumination. 



