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  • 1965-1969  (1)
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    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 105 (1969), S. 344-360 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The action of nitrous acid on H. influenzae transforming DNA has been studied. Two of the antibiotic resistance markers studied, marker S (streptomycin) and marker N (novobiocin) show a difference in sensitivity towards nitrous acid. For these two markers, the loss of transforming activity is in accordance with a theory of transforming DNA proposed by Bresler and coll. In this theory the inactivation is related to the existence of damages that reduce the length of the donor DNA that is integrated. For the third marker studied, a K marker (kanamycin) the shape of the inactivation curve is somewhat different and shows the existence of an exponential component. The inactivation of the streptomycin-novobiocin linkage group (weakly linked markers) is additive, whereas the inactivation of the streptomycine-kanamycine group (closely linked markers) shows an overlapping effect which can be accounted for by the theory. These results are discussed in the text. Furthermore, the kinetic of induction by nitrous acid of “reversible” DNA molecules has been studied. This has been done by means of measurements of the transforming activity of nitrous acid treated DNA before and after heat denaturation and by hydroxylapatite chromatography of the heated DNA. It is shown that the kinetic of induction of “reversibility” is the same for the three unlinked markers studied. The direct estimation of the size of the crosslinked fraction indicates that the crosslinking effect of nitrous acid is not a major factor in marker inactivation. Finally, in view of our own results and of those obtained by others, we discuss the failure of nitrous acid to be mutagenic on native H. influenzae DNA. This failure, which contrasts with the result obtained on B. subtilis and Pneumococcal DNA, cannot be attributed to the existence of the nitrous induced crosslinks.
    Type of Medium: Electronic Resource
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