122 The Maximum Efficiency of Photosynthesis 



Experiment 4 



June 10, 1949 



Culture medium, pH 5. Gas phase 5° CO-2 in air. 300 cu. mm. of cells in each vessel. 



AJ = 5.3 



No. 5 



v = 17.993 vf = 7.00 



£o 2 = 1-046 &co 2 1-634 



10' dark 9.0 10' AJ — 5.5 



20' dark — 17.0 20' AJ — 10.5 

 30' dark — 22.5 30' AJ — 13.0 



60' dark — 48.5 60' AJ — 29.0 

 60' H - 19.5 



} y = - 1.23 



= 2.8 



Besides the quantum requirement of 3, this experiment shows that the "Urning" has no do- 

 minant influence on the quantum requirement. For the pressure changes in both vessels were for 

 different time periods : 



No. 5: H' = (h'j - AJ - h'j) No. 3: H = (Aj -- AJ + h 3 ) 



10' - 8 mm. 10' - 3.5 mm. 



20' : 19 mm. 20' -6.5 mm. 



30' -26.5 mm. 30' 4- 9.5 mm. 



The above values are perfectly within the limits of the possible errors. 



Experiment 5 



June 13, 1949 



Culture medium, pH 5. Gas phase 5% CO2 in air. 300 mm. 3 of cells in each vessel. 



AJ = 5.3 



3>o 2 = - 104 cu. mm. 1 _ 



jyc'02 = — 130 cu. mm. | ' 



1^47x50 



104 



From the dark values in No. 5 and No. 3 the respiration was calculated : 



50' dark H' = - 123 mm. H = -- 54 mm. 



.rn, = — 202 cu. mm. 1 , , _ 



1 000 y = - 1.15 



XCO2 "" 232 cu. mm. | ' 



242 

 and X(i, for 60' - - 242 cu. mm. or - - • 100 = 81",, of the cell volume/hr. 



300 



