i I 1 \ \ ' » i 111 1 1 11 I I I I r i^r i i I 1 



ao5 — 



soo 



Wavelength in m^t. 



Fig. 6.3. (A) A typical partial bleaching experiment (carp extract, 

 pH 8-24, T = 20°C). Curve 1, original density spectrum; curve 2, after 

 3 hr exposure to violet light (430 m/n) — unchanged after 1 8 hr in dark- 

 ness; curve 3, after 1 hr further exposure to red light (630 mju); curve 4, 

 after 1 hr further exposure to green light (530 m^); curve 5, after 22 hr 

 in darkness; curve 6, after 10 min exposure to white light. O, measure- 

 ments made consecutively from 380 to 640 mju; •, return measure- 

 ments from 630 to 390 m/i. (B) Difference spectra, formed from the data 

 of (A) by subtracting the density spectrum at any stage from that for the 

 preceding stage. 

 {Crescitelli and Dartnall, 1954) 



