VIRUS GENETICS, MULTIPLICATION, AND PHYSICS 



Diameter 298 A 



195 



-Internal 

 hydration 



Nucleic acid 

 concerned with 

 replication 



Nucleic 

 acid 



attached to 

 protein 



Monolayer 

 of water 



Small antigens 

 (protein) 



Large antigen 

 (protein) 



Fig. 8.2. Representation of southern bean mosaic virus in a manner which 

 incorporates some definite and some speculative knowledge. The location of 

 the nucleic acid is quite speculative. 



In Fig. 8.5 a very incomplete presentation of an animal virus, 

 Newcastle disease, is given. 



Taking southern bean mosaic virus first, the most remarkable 

 fact is the accurate spherical shape. Second is the existence of a 

 double repeated antigenic pattern on the surface. This plant 

 virus forms crystals, and seemingly also does so inside the in- 



