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- W1990095559 abstract "The radiation response of V79 Chinese hamster cells grown as multicellular spheroids has been investigated by determining survival curves for treatment under a variety of different oxygen concentrations. Spheroids were irradiated under fully oxygenated conditions in air-equilibrated medium at 37/sup 0/C, in medium exposed to lower oxygen tension (5% O/sub 2/) for times varying from 1 hr to 3 days, or under anoxic conditions. For comparison with the spheroids, using identical treatment conditions, V79 cells were grown in suspension as a subconfluent monolayer attached to Sephadex (microcarrier) beads and irradiated under fully oxygenated or anoxic conditions. The radiation response of cells at different depths within the spheroid was investigated by using a sequential trypsinization technique developed to remove eight or nine shells of cells successively from the spheroid surface. When irradiation was given under fully oxygenated conditions the outer few cell layers were more sensitive than the inner cells, a finding which is not understood. As expected the inner cells in spheroids irradiated in air (at 37/sup 0/C) or in 5% O/sub 2/ are more resistant than the outer cells. For an acute exposure to 5% O/sub 2/ (1 hr) in the inner cells displayed full radiobiological hypoxia; however, formore » chronic exposures to low oxygen this was not the case. These results with the sequential trypsinization procedure suggest that the radiation response of cells in spheroids is more complex than anticipted.« less" @default.
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- W1990095559 date "1981-05-01" @default.
- W1990095559 modified "2023-09-25" @default.
- W1990095559 title "Radiobiological Studies of Cells in Multicellular Spheroids Using a Sequential Trypsinization Technique" @default.
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- W1990095559 doi "https://doi.org/10.2307/3575512" @default.
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