INTRODUCTION AND METHODS 



1-0 



0-5 



I I i I I I I I I I I I I i I I I i 



100 



E 

 E 



X 

 (0 



E 

 *b50 



(U 



en 



o — 



B 



\ ^AII curves 



I I I I I I I I I I I I I I I I I I I 



400 



500 

 Wavelength in nnp 



600 



Fig. 1.7. (A) Density spectra of visual purple solutions of various 



concentrations as in Fig. 1 .6. (B), as (A), but replotted as percentages of 



their respective maxima (all curves the same). 



17 



