58 



THE BACTERIAL PHOTOCHEMICAL APPARATUS 



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120 



180 240 



MINUTES 



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360 



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Fig. 4. Effect of temperature shift and of 5-methyl-tryptophan on growth and 

 bacteriochlorophyll synthesis, (a) Two cultures were grown at 34°, at the time 

 indicated by the arrow one culture (open points) was transferred to 23°, the 

 second culture (filled points) remained at 34°. (b) This experiment was con- 

 ducted as described in the legend for Fig. 1; at time zero DL-5-methyl- 

 tryptophan (50 //g/ml) was added to one culture (open points). Bacteriochloro- 

 phyll (/ig/ml), DandB; cell mass (OD at 1000 m^), Oand#. 



