Decay of the Delayed Light Emission in Chlorella* 



WILLIAM ARNOLD, Biology Division, Oak Ridge National Laboratory, 



Oak Ridge, Tennessee 



The process of photosynthesis seems to he partially reversible; 

 green plants emit light for some time after they have been illumi- 

 nated. Strehler (this volume) has given reasons for believing that this 



10^ 



10^ 



io*H 



lio'-J 



< 



z 

 o 

 in 



10- 



0.01 



01 



100 



1,000 



10.000 



\ 10 



TIME (sec) 



Fig. 1. Intensity of the delaj^ed light in arbitrary units as a function of the time 



in the dark in seconds. 



delayed light production is the reverse of photosynthesis. The present 

 paper is a study of the decay of the delayed light in Chlorella. In 



* Work done under U.S. Atomic Energy Commission Contract No. W-7405- 

 eng-26. 



128 



