BIOCHEMISTRY OF INSECT VIRUSES 



519 



64.6 % of that of the virus, and 94.5 % of that of the polyhedron protcm. On 

 a nitrogen basis, the analyses account for 94.4 % of N (nitrogen) in the 

 membranes, 86.1 % of N in the virus, and 95.2 % of N (nitrogen) in tlic 

 polyhedron protem. These figures would be even higher if corrections for 



TABLE VII 



Amino Aero Composition of the Virus Membranes, Virus, and Polyhedron 

 Protein on a Nitrogen Basis" 



" From Bergold and Wellington, 1954. 



* Corrected for glycine produced by hydrolysis of nucleic acid. 



** Determined by the method of Gordon and Mitchell (1949). 



ammonia, try|3tophan, and humin coidd have been appUed. The differences 

 between the amino acid nitrogen and total nitrogen are due to nitrogenous 

 compomids and decomposition products not recovered. TryjDtophan could 

 not be determmed in the virus because of interference of DNA in the color 

 reaction nor in the membranes because of lack of material. Considering the 



