Permeability Changes in Yeast Cells after X-Irradiation and Starvation

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Abstract
Losses of P32, 260-m[mu] absorbing material, and viability of irradiated and un-irradiated yeast cells were measured throughout a 24-hour period of starvation after irradiation. Irradiated cells lost less P32 than unirradiated cells but lost equivalent amounts of 260-m[mu] absorbing material. Permeability to methylene blue was not altered. The loss of cell materials before a decrease in viability occurred precludes the change in viability as a cause of the loss. The differences observed in membrane passage of different materials contribute to the need to isolate specific changes for study from the usually complex responses to radiation.

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