978 



THE LIGHT FACTOR. 



INTENSITY 



CHAP. 28 



300 



250 



£ 200 



£ 



O 

 o 



fe 150 



LlI 



< 



t 100- 



O pH 6 3 

 A pH 76 



/ 



/ 



/ 



/ 



/ 



50^ /.■ 



k 



I 





X 10' 



E 



e 



o 

 o 



600 



500 



400- 



i~ 300- 



u. 

 o 



UJ 



< 200 



y- 



Q. 



13 



100 



15% Hs 

 o pH 63 

 A pH 7.6 



/ 



/ 



/ 



/ 



/ 



y 



/ 



/ 



/ 



/ 



/ 



/ 



// 



// 



// 







X 10^ 

 i_ 



INCIDENT INTENSITY, erg/cm^ sec 



Fig 28 12 Effect of pH on rate of COo reduction by Chromatium (after Wassink, 

 Katz and Dorrestein 1942). 15% Ho (at right) or 1% H2S0O3 (at left) as reductant, 

 5%C02, 29°C. 



300 



20 



40 60 80 100 

 INCIDENT INTENSITY 



120 140 



Fig. 28.13. Light curves in relation to age in Chlorella (after 

 Wassink and Katz 1939). Gas pha.se air, 29° C. 



