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- W2132949488 abstract "A number of reactivation possibilities for u.v.-inactivated lambda phage have been discovered and studied, but in the case of inactivation by x-rays, only a few cases of reactivation have been described (Watson 1950, Weigle and Bertani, 1956, Harm 1958). It has been shown that x-rays cause different types of lesions with partially overlapping effects; for example, x-ray damage can block the first step of infection by preventing the DNA from being injected. In an earlier paper (HradecnA 1966), we described the effects of x-rays on the adsorption and injection of lambda phage and reported that about 20 per cent of all lethal lesions are of this type. A study of the reactivation processes acting on DNA injected into the host cell must therefore take into account the loss in adsorption and injection. Since the approximate extent of this loss is now known, it is possible to evaluate the efficiency of the different reactivation processes on the injected part of the DNA. We were especially interested in discovering if part of the x-ray damage could be reactivated by photo- or host-cell reactivation. Our results show that no such lesions exist on x-ray-inactivated phage. Another problem was that of the partial injection, pointed out in the discussion of the earlier paper. One would have hoped to see a polarity in injection by measuring marker rescue: the first injected markers should be rescued much more frequently than the last. Our results indeed show that some markers are preferentially rescued. Since the observed polarity does not agree with the genetic map of infective particles, we cannot decide between a polarity in injection or some other unknown phenomenon involved in the rescue mechanism." @default.
- W2132949488 created "2016-06-24" @default.
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- W2132949488 date "1967-01-01" @default.
- W2132949488 modified "2023-09-26" @default.
- W2132949488 title "X-ray Inactivation of Lambda Phage" @default.
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- W2132949488 doi "https://doi.org/10.1080/09553006714550581" @default.
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