1398 



INDUCTION PHENOMENA 



CHAP. 33 



20 40 60 80 



INCIDENT INTENSITY 



100 



Fig. 33.41. Slope of second fluorescence wave as function of light 

 intensity at various temperatures (after Wassink and Katz 1939). 

 Gas phase, air; total inhibition of photosynthesis by cyanide. 



o 



z 



LlI 

 O 



to 



UJ 



o 



UJ 



o 

 (/) 



UJ 



o 



Z) 



TIME, sec. 



Fig. 33.42. Phenylurethan effect on fluorescence of Ulva lactuca (after Kautsky and 

 Franck 1943). (A) Different phenylurethan concentrations; / = 40 m. c. (equiv.); 

 20° C. (B) Different light intensities (in equivalent meter candles); air; first 3 sees. 

 (C) Different temperatures. 



