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Survival of Pseudomonas bacteriophage P421 under different stress factors. The phages were treated with UV irradiation for from 5 to 80 min (A), at temperatures from 4 to 70 °C for 1 h (B) and with a pH of from 2 to 13 for 1 h (C). All tests were carried out three times. Standard deviation (sd) is shown for each bar.
