| distribution of plasmid maintenance regions among incfiv plasmids. | the distribution of the incfi basic replicons among incfiv plasmids was assessed by dna hybridization. in addition these and 20 other plasmids from 16 incompatibility groups were screened for the presence of inciv, an incompatibility determinant recently found on the incfiv plasmid r124. the inciv determinant was found commonly but not universally among the incfiv plasmids. it was also detected on the incfi reference plasmid r386 and plasmids from incb, inci alpha and inci gamma. the frequency a ... | 1989 | 2653956 |
| analysis of a region in plasmid r386 containing two functional replicons. | a miniplasmid has been obtained from r386 by ligating ecori fragments with a fragment carrying a kanamycin-resistance gene. it contains a 6.8-kb eco fragment of r386 which hybridizes strongly with several incfi plasmid dnas but not with the primary or secondary replicons of the f plasmid. this mini-r386 is incompatible with certain incfi plasmids, and it appears to be one example of a previously unidentified replicon widely distributed in the incfi group. a region of r386 not closely linked to t ... | 1985 | 2994129 |
| shigella sonnei plasmids: evidence that a large plasmid is necessary for virulence. | virulent form i shigella sonnei strains contain a 120-megadalton plasmid that is absent in their form ii derivatives, which are always avirulent and devoid of o side chains. in the present study, 165 biochemical and antibiotic traits were assessed, but no experimentally useful phenotype could be associated with this large form i plasmid. therefore, the form i plasmids of several s. sonnei strains were tagged with the antibiotic resistance transposons tn3, tn5, or tn10. transposon-tagged form i p ... | 1981 | 6271687 |
| the rate of horizontal transmission of antibiotic resistance plasmids is increased in food preservation-stressed bacteria. | the aim of this study was to investigate the possibility that sublethal food preservation stresses (high/low temperature, osmotic and ph stress) can alter the rate of horizontal transmission of antibiotic resistance (abr) plasmids between escherichia coli strains and between e. coli and salmonella serotype typhimurium. | 2007 | 17953597 |