Radiation Action on Some Metabolic Processes in Escherichia coli

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Abstract
The effect of Co60 radiation on the time course of uptake of P32O4, S35O4, the formation of DNA, the induction of [beta]-galactosidase, the formation of [beta]-galactosidase, and the formation of lipid in cells of Escherichia coli has been measured. Except in the case of DNA formation, there is no immediate postirradiation effect unless doses in excess of 60,000 r are used. At later times a depressed linear increase is observed, the time of beginning linearity being shorter for higher doses. At late times, irradiated cells leak [beta]-galactosidase to the medium. The results indicate that there is initial damage to the nucleus followed by the sequence: [image] The time course of damage appearance after radiation shows lipid to be affected latest, protein next, and P32 uptake toward the early times, in agreement with the above.

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