18 



KERATIN AND KERATINIZATION 



030 



/220 020 N 



<4I0 



**' A 



1400 |200# OOOI0 | 



Fig. 10. The /3-pattern indexed in terms of an orthorhombic unit cell 

 a = 9-3 A, b = 6-66 A and c = 9-7 A. The 001 and 200 reflections are 

 those ascribed to reflections from the two main dimensions (side and 

 backbone) of the polypeptide chain. The assignment of indices shown 

 in Figs. 9 and 10 should be regarded as tentative only. Many of the weaker 

 reflections indicated in the drawings (Figs. 9 and 10) are often obscured 

 by the extensive halo pattern also present and are rarely measured 

 (Plate IB). Figures 9 and 10 have been redrawn from Astbury and 

 Bell (1939). 



Fig. 11. Idealized X-ray diagram of disoriented /? and denatured 

 proteins. 



