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Proportion of phage-insensitive and phage-sensitive cells within pure strains of lactic streptococci, and the influence of calcium

Published online by Cambridge University Press:  01 June 2009

Johannes Tesfaigzi
Affiliation:
Institut für Mikrobiologie, Universität Hohenheim, Garbenstr. 30, D-7000 Stuttgart 70, FRG
Roland Süssmuth
Affiliation:
Institut für Mikrobiologie, Universität Hohenheim, Garbenstr. 30, D-7000 Stuttgart 70, FRG

Extract

It is of industrial importance to investigate the interaction of Streptococcus lactis with phages. Although it has been long recognized that in phage–bacterial relationships the phage-carrier state can occur (Hunter, 1947), relatively little study has been done on this subject. The terras ‘phage-carrier state’ and ‘pseudolysogeny’ have been used synonymously to describe bacterial cultures which are persistently infected with a virus (Barksdale & Arden, 1974, Lawrence et al. 1976). The phagecarrier state differs from lysogenesis in that the bacteria are easily separated from the bacteriophage by a simple plating and re-isolation procedure (Graham et al. 1952). Süssmuth & Tayran (1986) showed that after lysis of one single strain, phage and phage-insensitive bacteria coexist. This work investigates the proportion of phage-insensitive bacteria remaining after lysis of other Str. lactis strains, the effect of calcium on this proportion, and the number of generations required to return to a normal sensitive population.

Type
Short Communications
Copyright
Copyright © Proprietors of Journal of Dairy Research 1989

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References

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