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J Virol. 1969 March; 3(3): 343-349
Copyright © 1969 American Society for Microbiology. All Rights Reserved.

Loss of Lysis Inhibition in Filamentous Escherichia coli Infected with Wild-Type Bacteriophage T4

Cancer Research Institute, Faculty of Medicine, Kyushu University, Fukuoka, Japan

ABSTRACT

The plaque enlargement of wild-type T4 bacteriophage observed when assayed in the presence of low concentrations of mitomycin C or after exposure to very low doses of ultraviolet light was studied by using solid as well as liquid culture media. It was found that the filamentous cell formed by the treatment with the agents is responsible for the phenomenon. The filamentous cell was also shown to be characterized not only by the loss of capacity of lysis inhibition but also by a shortening of the latent period. No difference in cellular rigidity could be seen between the filamentous cell and normal cell as far as the analysis from the outside of the cell was concerned, whereas the former cell was shown to be more readily susceptible to phage-induced lysozyme from the inside of the cell. A possible change in the membrane of the filamentous cell and a possible mechanism for lysis inhibition are discussed.

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