33G 



E. C. WASSINK 



We have iiu'osti gated the lime course of the conversion of phos- 

 phate, thus reproducing the Avell-known experiments of Handler (4). 

 We repeated these experiments because we wished to know the time 

 constants of tliese phenomena for the cell material we used. The time 



1 



3 Tiin 



Fig. 3. Comparison of some induction phenomena in Chlorclla photosj-nthesis. 

 Ordinate: arbitrary units. Abscissa: time of illumination in minutes. Curve 7: 

 Bioluminescence of Chlorclla, after Strehler and Arnold (7). Curve 8: Same as 

 curve 7 (8). Curve 9: Bound phosjjhate in nitrogen atmosphere (5). Curve 10: 

 ATP-formation, after Strehler (8). Curve 11: Bound phosphate, in an atmos- 

 phere of air (5). (The whole figure from ref. 6.) 



scale of the concentration changes of TCA-soluble phosphate in the 

 cell material was abbreviated with respect to that of Kandler. The 

 inverse curve was taken to represent the changes in TCA-insoluble 

 phosphate formed (5). The time course and the sequence of maxima 

 and minima showed a close affinity to maxima and minima of fluo- 

 rescence and redox potentials (G) . Moreover, a close affinity appeared 



