972 



THE LIGHT FACTOR. I. INTENSITY 



CHAP. 28 



150 



£ 100 



E 



CM 

 O 



<3 



50 



^ I 23 4567x10* 



LIGHT INTENSITY.erg/cm^ sec. 



Fig. 28.5. Light curves of diatoms (Nitzschia sp.) in Richter 

 solution (after Wassink and Kersten 1945). In 5% CO2 and in 

 C02-freeair, 17° C. 



10 , 



E 

 E 



o 

 o 

 tl. 

 o 

 liJ 



< 



a. 



3 



Fig. 28.5 A. Light curves of CO2 re- 

 duction by purple bacteria (Chroinatium 

 D) at two CO2 concentrations (after 

 Wassink, Katz and Dorrestein 1942). 

 1% thiosulfate, pR G.3, 29° C. 



Fig. 28.5B. Light curves of COo re- 

 duction bj' purple bacteria (Chromatium 

 D) at two different thiosulfate concen- 

 trations (after Wassink, Katz and Dorre- 

 stein 1942). 5% CO-,, pU 6.3, 29° C. 



Abscissa for both figures, incident intensity in (erg/cm. ^ sec.) X 10" 



