Abstract
Alkylation by ethyl or methyl methanesulfonate to an extent that inactivates more than 99.5% of T7 coliphages has no effect on phage adsorption on Escherichia coli B cells, but decreases the amount of phage DNA injected into the host cells. Depurination interferes with the injection of the phage DNA. Failure to inject the whole phage genome thus appears to be a cause of the immediate as well as of the delayed inactivation of the T7 coliphage treated by monofunctional alkylating agents; the hypothesis that it is the only cause of inactivation, although not very likely, cannot be excluded at the present time.
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