Plasmids in Listeria monocytogenes in relation to cadmium resistance

Article Abstract:

An investigation was conducted to determine the presence of plasmids and plasmid-borne resistance genes in Listeria monocytogenes. The results showed that plasmids are more frequently encountered in serogroup 1 strains from food and environment. Antibiotic susceptibility tests showed that all L. monocytogenes strains are not resistant to antibiotics. However, 95.3% of the plasmid-positive strains were resistant to cadmium. Conjugation and plasmid curing experiments confirmed that cadmium resistance in L. monocytogenes is plasmid-linked.

Cadmium

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Evaluation of seven experimental phages for inclusion in the international phage set for the epidemiological typing of Listeria monocytogenes

Article Abstract:

Five out of seven experimental bacteriophages have been successfully inserted into the international phage set for subtyping the microorganism Listeria monocytogenes. The resulting system has improved matching properties, particularly in the identification of bacterial strains within serogroup 1/2. The phages 9425, 1313, 12682, 5775, 6223, A511A511 and 197 were used against serogroups one and four of L. monocytogenes.

Demographic aspects, Bacteriophages, Bacteriophage typing

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Presence of lactose genes and insertion sequences in plasmids of minor species of the genus Lactococcus

Article Abstract:

Type strains of known Lactococcus species and biovars were screened for the presence of plasmid DNA and of cloned plasmid genes and insertion sequences. DNA hybridization using four different probes was performed. Lactose utilization was found to be determined by plasmid-borne genes in minor species of Lactococccus.

Lactose, Insertion elements, DNA, DNA insertion elements

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