Lysogenization and Nuclear Segregation

Uetake, Hisao; Hagiwara, Shin

doi:10.2222/jsv.9.574

Cited by 2 publications

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“…These values are in agreement with the final proportion of about 10% lysogenic cells found in the mass growth experiment (Uetake et al, 1958). In infection of S. anatum (group E2) with phage 1634, the proportions of phage-noncarrier cells in the progeny increased with the decrease of multiplicities of infection (Uetake and Hagiwara, 1959).…”

Section: Discussionsupporting

confidence: 88%

Drug Resistance of Enteric Bacteria Ii

et al. 1963

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Transmissible drug-resistance (R) factors, which transfer resistance to tetracycline (TC), chloramphenicol, streptomycin, and sulfonamide by cell-to-cell contact, were found to be transduced in the system of Salmonella E group with phage epsilon (e15 and E34). The R+ transductants of S. newington (S-84) and S. chittagong (S-224) were all found to be unable to transfer their R factors by conjugation, and their R factors were not eliminated by treatment with acridine dyes so far as tested. The R factors containing TC resistance were consistently segregated when transduced. At low multiplicities of infection, the R+ transductants with E,5 were all nonlysogenic and unable to produce normal E15 phage particles; among the R+ transductants with E34, 34 % were lysogenic and 66% were sensitive to E34 It was found that multiple drug resistance was transferred in vitro from resistant Escherichia coli to shigellae, and also from resistant shigellae to E. coli (Ochiai et al., 1959; Akiba et al., 1960). We confirmed this finding and demonstrated that this transmission is not mediated by transduction, transformation, or a filtrable agent, but by cell-to-cell contact (Mitsuhashi, Harada, and Hashimoto, 1960; Harada et al., 1961). This was also confirmed by blender treatment (Watanabe and Fukasawa, 1960a, b).

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Section: Discussionsupporting

confidence: 88%