BACTERIOCHLOROPHYLL BANDS IN BACTERIA 



703 



correlation. An alternative is to consider both cell bands, that at 800 as 

 well as that at 850-870 m/x (and perhaps that at 900 mn, too) as related to 

 the one solution band at 770 m^t. This means "red shifts" varying be- 

 tween 500 and 2000 cm.~^, and implies that bacteriochlorophyll is present, 

 in purple bacteria, in at least three different pigment-bearing complexes. 



_ strains 



740 



ENERGY, e.v. 

 .6 1.5 1.4 



""■ ' — I 1 H 1 1 r 



1.3 



800 



2.0 



_ strains; 



( 1 ) Rhv. I 



(2) Rhv. 2 



0.5 



ENERGY, e.v. 

 1.6 1.5 14 



1.3 



— I T 1 r- — I 1 r — I 1 r- 



900 960 740 800 900 960 



740 800 



WAVE LENGTH, m^ 



900 960 740 



800 900 960 



WAVE LENGTH, m/t 



Fig. 22.36. Infrared absorption spectra of suspensions of different strains of Athiorho- 

 daceae (after Wassink, Katz and Dorre.stein 1939). 



The wide variations in the relative intensities of the three absorption 

 peaks (illustrated by the several curves in figure 22.36, and even more 

 strikingly by the curves in figures 21.30A, 21.30B, 22.26 and 22.7) can 

 then be attributed to differences in the relative amounts of the several 



