1066 



THE LIGHT FACTOR. I. INTENSITY 



CHAP. 28 





o 

 in 



LlI 



o 



No Reductant 



INCIDENT INTENSITY, erg/cm sec. 



B 



Fig. 28.50. Effect of ethylurethau on fluorescence of Chromatium in the ab- 

 sence and pressence of reductants (after Wassink, Katz and Dorrestein 1942). 

 5%C0-,, pH7.6, 29° C. 



100 



CO 



< 



O 

 O 



U. 



o 



I- 

 < 



a: 



Photosynthesis 

 Fluorescence 



10 20 30 40 X 10* 



LIGHT INTENSITY, erg/cm.^ sec. 



Fig. 28.51. CO2 assimilation and fluorescence vs. incident light intensity (after 

 McAlister and Myers 1940). Solid symbols, intensity of fluorescence, F; open 

 symbols, rate of CO2 uptake, P. 



