Fig. 1 . Spectrum of oxidized (broken line) and reduced (solid line) R. rubrum RHP 



at pH 7. For the main curves, 0-66 x 10"^ //moles/ml, and for the inset curves 



2-7 X 10-2 /<mole/ml in m/15 phosphate were used. (Reproduced by permission of 



the Journal of Biological Chemistry.) 



400 450 500 550 600 

 WAVELENGTH (mii) 



650 



Fig. 2. Difference spectrum of R. rubrum RHP at pH7. (Reduced-minus-oxidized) 

 in A, 0-66 x IO-2 /imole/ml and in B, 2-7 x IO-2 /<moles/ml in 007 m phosphate 

 were used. (Reproduced by permission o^ ihc Journal of Biological Chemistry.) 



