ENERGY TRANSFER IN GREEN BACTERIA 



419 



o 

 < 



< 



10' 



EINSTEIN cm-2 sec"' 



Fig. 5. Initial rate of absorbancy change at 422 m/i as a function of intensity of 

 irradiation at 812 m/i. The suspension of Cps. ctJiylicitiii absorbed 22% of the 

 actinic light. The dashed line indicates the slope of the curve at very low in- 

 tensities. 



(1/0) for cytochrome oxidation at 2°C for two concentrations of bac- 

 teria. The minimum requirement appears to be two quanta per electron. 

 The action spectrum of cytochrome oxidation is compared with the 

 absorption (1 - T) spectrum of the bacteria in Fig. 6. The absorption 

 spectrum given by the opal glass method has been further corrected 

 for light- scattering by the assumption of a slight scattering error, 

 Terror = k (X- 900), calculated from the slope of the Gary trans- 

 mission curve between 900 and 850 mfi. Without the correction the 



