260 



IV THE PRINCIPLES OF LIFE PHENOMENA 



hormone-like function of the ions. We have found that the properties 

 of virus-like polymerization product of proteins are remarkably in- 

 fluenced by inorganic salts : Protoplasm particles, including viruses, 

 are agglutinated at weakly acid pH values and exhibit high turbidi- 

 ties, which are markedly changed by the presence of inorganic salts 

 (68) (69). The isoelectric point of the particulate proteins, at which 

 the turbidity is most manifest, is generally shifted to more acid sides 

 with the increase in the salt concentration, whereby the turbidity at 

 the pH values more acid than the isoelectric point becoming higher. 

 These effects vary, in a most remarkable way, with the kind of ions. 



The influence of inorganic salts upon the turbidity of vaccinia 



virus-protein solution. 



Concentration of the virus protein : 0.1?^ ; concentration of 



salts : 0.2n. 



The degree of the turbidity at pH 7.0 when no salt was present 



was taken as 10. 



An experimental result obtained with vaccinia virus is shown in 

 Fig. 24. Although the influence of ions on the turbidity degrees is. 



