210 



LIGHT AND LIFE 



certain cofactors that function in the huninescence of other systems 

 (vide infra) , vi/., adenosine triphosphate (ATP) ) , flavin mononu- 

 cleotide (FMN), diphosphopyridine nucleotide in the oxidized 

 (DPN) or reduced state (DPNH), or decaldehyde, separately or in 

 combination. The same factors had no definite effect on the lumines- 

 cence of fresh homogenates, except for decaldehyde, which caused 



CO 







10 



20 30 



40 50 60 

 SECONDS 



70 80 90 100 





1 1 1 1 1 



20 40 60 80 100 120 240 260 280 300 



SECONDS 

 lig. lA. Course ol liglil iiKcnsily allti ;uklin}> O.L' ml ol (i M urea lo desiccated, 

 ])o\V(lercd riug ciuals ol A<jH()rcn. aud thcu adding L'.K ml of distilled water, at 

 limes indicated 1)V tiie respective arrows in the figure. Data plotted from F.sterline- 

 Angus aulomalic recordings of amplified output from RCA ll'L'l ptiot()multii)lier 

 tulie used to measuie instaniancous intensity ol lumiuesceiue. 



Fig. lli. Similar to A, but (l.f) m\ of '50% NaCl solution was added instead of 

 urea, followed bv ?< ml of distilled water. 



