Abstract
When Micrococcus radiodurans cells were heated at 55°C for 8min, DNA from the cells sedimented in an alkaline sucrose density gradient more slowly than DNA from unheated cells as DNA from the bacteria exposed to ionizing radiation. The single strand scissions in DNA molecules were repaired during incubation in nutrient broth. Nalidixic acid inhibited such a repair during post-heating incubation.
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