896 



CONCENTRATION FACTORS 



CHAP. 27 



PC02>'°''°°'^ 



0.2 



0.3 



0,4 



0.5 



50 100 150 



[G02],(mole/l)x I0« 



200 



Fig. 27.2C. Carbon dioxide curve of Chlorella pyre- 

 noidosa (after Emerson and Green 1938). ^//25 phosphate 

 buffer; pH 4.6; 25° C; rate in mm.' 02/hr. per mm.' of cells. 



27.2A, 27.2B, 27.3 and 27.4. Figure 27.2B (taken from van der Honert's 

 work on Hormidium, 1930) closely resembles Blackman's prototype: At 

 low concentrations, all curves merge into a single straight line; close to 

 saturation they sharply turn horizontal. Emerson and Green (1938) gave 

 a single [CO2] curve for Chlorella in saturating light, which showed an even 

 earlier and more sudden saturation: It rose linearly up to [CO2] — 0.7 X 



0.082 0164 0246 



f COjj , volume per cent 



0328 



0410 



Fig. 27.3. Carbon dioxide c^urves of whole Triticum (wheat) plants at 

 different light intensities (after Hoover, Johnston and Brackett 1933). 

 Parameters in kerg/(cm.^ sec). 



