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- W2074038216 abstract "Abstract Corynebacterium diphtheriae strain P60(β) is lysogenic and toxinogenic. From this strain defectively lysogenic mutants that maintain their toxinogenicity have been isolated. The properties of one of these P60(βdf) mutants have been studied and compared with those of normal lysogenic strains, and with those of the classic high toxin-producing PW8 strain. When strain P60(βdf) is irradiated with UV, one or two infectious centers per 5 × 107 induced cells are obtained as a result of back mutation to P60(β). The particulate material released from the irradiated culture is similar in yield and in serological properties to normal β-phage released from P60(β) following UV induction. Like normal phage, βdf is adsorbed readily by suspensions of the sensitive C7(−) strain. UV-irradiated cultures of the PW8 strain also release an occasional plaque-forming particle (roughly one infectious center per 107 organisms induced) from which a phage indistinguishable from β phage can be isolated. However, the yield of particulate material serologically related to β phage is 1–2% or less than that obtained from the UV-induced cultures of the above strains. PW8, because of a defective respiratory system, grows slowly. Nevertheless, following irradiation with UV the burst occurs after about the same time interval as in the other strains. For PW8, this is equivalent to only 1 to 1 1 2 generation times, as compared to nearly 3 generations for the fast-growing strains. Our experiments raise the possibility that the low yield of phage-related material from the PW8 strain may be due to its defective respiratory metabolism, not to a defect in the phage genome. Lysis apparently occurs prematurely, before sufficient time has elapsed for more than an occasional complete phage particle to have been synthesized." @default.
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- W2074038216 date "1966-07-01" @default.
- W2074038216 modified "2023-09-23" @default.
- W2074038216 title "Phage-host relationships in certain strains of Corynebacterium diphtheriae" @default.
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- W2074038216 doi "https://doi.org/10.1016/0042-6822(66)90217-0" @default.
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