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Abstract
The effect of nalidixic acid on deoxyribonucleic acid (DNA) synthesis in Bacillus subtilis cells infected with bacteriophage SPO1 was studied. Nalidixic acid had little inhibitory effect on SPO1 DNA synthesis at concentrations that drastically inhibited B. subtilis DNA synthesis. Inhibition of DNA synthesis, appropriate to the concentration used, was imposed within 1 min after addition of nalidixic acid, suggesting that it acts directly on DNA synthesis in both infected and uninfected cells. The SPO1 DNA synthesized in the presence of high concentrations of nalidixic acid had a density characteristic of normal SPO1 DNA and was packaged into viable progeny phage particles, but its rate of synthesis was reduced and bacterial lysis was delayed.
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