426 



R. A. OLSON, F. S. BRACKETT, R. G. CRICKARD 



an apparent fusion with the first. Attention is directed to the oc- 

 currence of this fusion only after the preceding dark oxidation rate 

 reaches a sustained terminal value and hence above the critical O2 

 concentration for oxidative respiration. The sequence of burst maxima, 

 intervening minima, and corresponding terminal dark oxidation rates 



-8 



-10 — 



-12 



Fig. 8. Portion of original rate recording showing successive increase of second- 

 ary ma.ximum and its eventual fusion with the primary maximum. Suspension 

 dark adapted in Seaford N2 (0.002% O2) prior to run. 



is plotted against O2 concentration in Fig. 9. Whereas this indicates 

 that the role of dark oxidative metabolism in the O2 burst effect is not 

 a simple one, the present state of our knowledge does not warrant its 

 further discussion here. 



DISCUSSION 



The evidence, from the data presented above, for the dependence 

 of the oxygen burst rate upon O2 concentration (or the immediately 



