730 



William Vidaver 



4 5 



Time.min 



Fig. 3. Isolation of the pre-a transient in Ulva by 

 low temperature (4° C.) and light flashes. Transient 

 magnitude is almost undiminished by the highest applied 

 hydrostatic pressure (15000 psi). 



o 



> 



O 

 0) 



on 



-i 1 1 1 1 r-^' — I 1 r 



Light Light 

 on off 



Light on. off 



at top of 



first transient 



1 1 



I I 



4 5 6 7 

 Time.min 



ISOOOpsi 



Light 

 off 



Fig. 4. Pre-a transient isolation in Ilea at high tem- 

 perature (30°). The transient persists at the highest 

 applied pressure. 



