Article Abstract:
A mathematical model representing the dynamics of a colicinogenic and a colicin-sensitive population propagated under serial transfer culture conditions is presented. Also, a series of in vitro invasion experiments utilizing six representatives of the E colicin group were conducted, including the estimation of the growth rates and colicinogenic properties of the strains. Findings revealed that the properties of various colicinogenic strains cannot be employed to elucidate on the extensive variation in the relative abundance of different colicins in natural populations of bacteria.
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Article Abstract:
The frequency of colicinogeny and the resistance to the co-occurring colicins in a population of potentially interacting clones of Escherichia coli isolated from feral house mice were investigated. Of the 59% colicinogenic isolates, colicin E2 was observed to be the most common, representing 27% of the isolates. Although nine other colicin types were determined, phenotypic analysis failed to identify these isolates. It was observed that while the colicin types declined in frequency, the resistance of the isolates increased from 50% to 70% over seven months.
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Article Abstract:
The Escherichia coli colicin (Col) plasmids are maintainable by selection and conjugation for developing phage resistance ability. The Col plasmids decrease the predation ability of bacteriophages. Plasmid resistance is stronger than chromosomal resistance. Retention of plasmids with low resistance ability occurs in cells lacking chromosomal resistance. When both mechanisms are equally strong, most cells possess both chromosomal and plasmid resistance.
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