CYANIDE INHIBITION OF PHOTOSYNTHESIS 



305 



However, iron-deficient nutrient solutions, which Emerson used to grow 

 cells with a subnormal content in chlorophyll, may well have caused 

 also a deficiency in other, cyanide-sensitive catalysts. 



Table 12.V contains some typical results taken from the above- 

 mentioned investigations of Warburg, van der Paauw, and Emerson, 



Table 12.V 



Cyanide Poisoning of Photosynthesis and Respiration 

 IN Different Species of Algae 

 Strong light, abundant CO2 supply 



together with those of Lund and Holt (1923), Emerson and Green (1934), 

 Gaffron (1937, 1939), and Nakamura (1938). As nearly as possible, 

 values have been chosen which show the effect of approximately 10~^ 

 mole per liter of cyanide. If we designate strong sensitivity to cyanide 

 by + and weak by 0, table 12.V is found to contain all possible combi- 

 nations : 



The main result of Gaffron's work on Scenedesmus was to provide the 

 first example of a plant whose respiration can be suppressed by cyanide 



