The Maximum Efficiency of Photosynthesis 



119 



AJ = 5.4 



No. 5 

 Respiration more over-compensated 



No. 3 

 Respiration more over-compensated 



5'Jr 

 5'J-f 



5'J^ 

 5'.?4 



18.5 

 18.0 

 16.5 

 17.5 

 17.0 



5' (J + AJ) H 22 



5' (J + JJ) + 22.5 



5' (J + JJ) + 22.0 



5' (J + AJ) H 20.5 



5' (J + JJ) ; 23.0 



5'J -:- 

 5'JM 



14 



14 



12.5 



14.0 



11.5 



12.0 



5' <J + A3) 



5'(J 



- -jj) + 



5' (3 



25' jf + 87.5 



30 



25' (J + JJO 

 H' + 27 mm. 



JVo 2 



.VC02 = 



110 



30' J 78 



30' (3 



5' (J + JJ) + 



1J) + 



15.0 

 16.5 

 16.5 

 14.0 

 15.0 

 14.5 



A3) + 91.5 



30' H + 13.5 mm. 



+ 36.3 cu. mm. \ 

 32.6 cu. mm. 



— 0.9 



1 /JJ x 30 







36.3 



= 4.5 



Total duration of the experiment more than 7 hr. The entire experiment was performed with 

 the same cell Suspension. The result is that the quantum requirement is the same below and well 

 above the compensation point, within the experimental error. 



Experiment 2 

 June 1, 1949 



Comparison of the quantum requirements in acid culture medium, pH 4.9. and 0.1 AI carbonate 

 buffer (15 vol. 0.1 M K2CO3, 85 vol. 0.1 M NaHCOs) pH 9.2. 



Aliquots of the same cell Suspension. Two hundred cu. mm. of cells in each vessel. Gas space 

 in the two vessels with culture medium, 5% CO2 in air; in the vessel with carbonate buffer, air. 



The entire experiment with the same cell suspensions in the sequence reported below. 1 3 = 5.4 

 for all experiments, except the last, where A3 was 2.75. 



