325 



Govindjee 



sorption bands of systems I and II in the blue end of the 

 spectrum. 



The action spectrum of the enhancement effect with a 700 mjj, 



background light in ChlorellaS c^ showed, however, a hump around 



440 mn, in addition to several other bands, due to chlorophyll b 



and Chi a 670. This 440 m.[i band may be due to the Soret band of 

 Chi a 670. 



.40- 



660 670 6S0 

 WAVELENSTH, m/t 



i 



E 12 



700 mi) const 



CHLORELLfl 



eSOrn;* conslont 



660 600 



WAVELENGTH, nyi 



Figure 6, Action spectra of enhancement effect , 

 in Chlorella , as a function of wavelength. 



71gure 5. Absorption spectrum of Chlorella and 

 plfpents from Chlorella , (measuring band width 

 1 ^, «fcer Cedcrstrand). 



B. LIGHT INTENSITY AND THE ENHANCEMENT EFFECT 



Enhancement was measured, both as a function of the intensity 



