446 



CONTROL 



Mn DEFICIENT 

 + 

 CCP __ 



• " 



•^Mn DEFICIENT 



'in [ [iX ItfHiTE ] 



80 100 120 



TIME (MINUTES) 



140 



Fig. 3. The effect of manganese deficiency on the hydrogen meta- 

 bolism of adapted Scenedesmus cells, with and without 



CCCP. 0, Control + CCCP (10"5m), 9 * 



control, 6 0, manganese deficient cells + 



CCCP, t •, manganese deficient cells only. 



Note break in time axis during dark fermentation. 



80 120 160 



TIME (MINUTES) 



240 



Fig. k. Anaerobic gas metabolism of adapted Scenedesmus in the 

 presence of alkaline pyrogallol and palladium. 



■ 0, Control , d 9, alkal i ne 



pyrogallol in center well. • •, palladium 



on scotch tape cylinder in center well. 



