EFFECTS ON BIOELECTRIC ACTIVITY OF NERVES 



591 



1.6 



1.4 



1.2 - 



1.0 



0.8 



0.6 



0.4 



Beginning of "-^ 

 UV Irradiation 



•• Amp/ifude of Spike 

 -o Rate of Spike Rise 



20 



40 



60 



80 



MINUTES 



Fig. 15. Relati\e spike amplitude and rate of spike rise of impulses of giant ner\'e 

 fibers under UV irradiation, plotted as a function of time of irradiation, as in Fig. 12. 



the top cune, in which the nerve was irradiated until enhancement mani- 

 fested itself, at which time irradiation was terminated, but recording con- 

 tinued. The resuhs show not only that the energy supplied by concomitant 

 bombardment with UV is unnecessary for enhanced activity, but, once the 

 nerve fiber has been altered by UV, that the enhancement continues to 

 increase to even greater values than are possible with nerves subjected to 

 the concomitant destructive action of UV ( Bachofer, 1960b). 



