o 

 (a) t 



Tryptophane 



2200 



2600 

 Wavelength 



3000 A 



(b) > 



cr 



2200 



2600 

 Wavelength 



3000 A 



Fig. 6.5. (a) Absorption spectra of tryptophane, phenylalanine tyrosine, 

 and RNA, taken by Butenandt, Friedrich-Freksa, Hartwig, and Seheibe 

 (1942). (b) The absorption curve for TMV and, below, a line representing the 

 synthesis of absorption by 4.5% tryptophane, 5% RNA, 3.8% tyrosine, and 

 6% phenylalanine. The general, but not detailed, characters are reproduced 

 in this way. Data due to Butenandt et al. 



154 



