INHIBITORS AND PHOTO PIGMENT SYNTHESIS 



55 



estimated as described previously (1); protein was determined by the 

 Folin-Lowry method. Except in experiments with dinitrophenol, in- 

 crease in protein paralled increase in turbidity at 1000 m/i, and in 

 some experiments protein was not determined. 



Experiment 1. The effect of dicoumarol on growth and bacterio- 

 chlorophyll synthesis is shown in Fig, 1. The growth rate is reduced 

 to about 50% of the control. Bacteriochlorophyll synthesis is immedi- 

 ately inhibited but eventually recommences. 



180 

 MINUTES 



Fig. 2. Effect of dinitrophenol (DNP) on growth and bacteriochlorophyll 

 synthesis. The experiment was conducted as described in the legend of Fig. 

 1, except that at zero time one culture received DNP (4 x 10-5 M). Symbols 

 as in Fig. 1. 



