CARBON MONOXIDE INHIBITORS 315 



All the experiments reported here have been repeated at least 

 three times. The data i-eportcd in the table are those of individual 

 typical experiments. 



RESULTS 



Table I shows the percentage of elutable P*' found in phosphate 

 esters of interest in this study. These figvires are a quantitative meas- 

 ure of the isotopic phosphate found in the esters in the plant, since 

 further treatment of the tissue with boiling 30% ethanol extracts 

 gave very little more radioactivity, and since quantitative recovery 

 from the column has been demonstrated for those compounds con- 

 sidered here. 



TABLE I. Distribution of P^^ among Phosphates Separable from Barley Leaves 



after Exposure to CO 



Barley leaves (0.92 g.) were exposed to 95 juc of P'^ in 2 ml. of water under the 

 conditions and for the times shown. Counts on the fraction were made with a glass- 

 wall dipping tube counter under standardized conditions. White light from a 150- 

 watt reflector flood lamp (about 2000 foot-candles on leaves); red light, same 

 lamp behind a Corning 2030 red filter; yellow light from a sodium arc lamp of type 

 used for polarimetr}'. 



The numbers in the first two lines of Table I (Expts. 1 and 2) show 

 the usual distribution of phosphate found in barley leaves in air. 

 The leaves in light show about the same distribution of P^- at this 



