The morphology and nucleotide composition of DNA of Citrobacter phages.

Citrobacter phages 38/37, 31/37, 40/1 and 8/5, isolated from lysogenic cultures, were concentrated and purified by 2 cycles of differential centrifugation. Electron microscopy of the phages has shown that their particles have similar morphology and that they relate to the morphological group A1. The heads of the phages are hexagonal, 50 +/- 2 nm in diameter.

[Isolation and properties of Citrobacter bacteriophages].

Four phages differing in their antigenic properties, thermosensitivity and spectrum of action have been obtained from Citrobacter lysogenic cultures. To prepare the suspension of Citrobacter phages, phagolysates may be treated with chloroform 1:10 for 30 minutes. The isolated phages have proved to be highly specific.