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A competitive microflora increases the resistance of Salmonella typhimurium to inimical processes: evidence for a suicide response

Article Abstract:

Research was conducted to examine the validity of the hypothesis that a competitive microflora increases the resistance of Salmonella typhimurium to inimical processes such as freeze injury. An spvRA::luxCDDABE reporter was utilized to evaluate RpoS activity in S typhimurium challenged with varying concentrations of a competitive flora. Results suggest a suicide hypothesis for the destruction of rapidly growing cells by inimical processes which lead to the growth arrest of exponential-phase cells and to the decoupling of anabolic and catabolic metabolism.

Author: Dodd, Christine E.R., Stewart, Gordon S.A.B., Aldsworth, Timothy G., Sharman, Rachel L.
Publisher: American Society for Microbiology
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1998
Bacterial growth, Salmonella typhimurium

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The viable but non-culturable phenomenon explained?

Article Abstract:

Efforts to culture cells derived from environmental sources or from cold-stored or starved lab microcosms such as 'Vibrio vulnificus,' 'Micrococcus luteaus,' and 'Escherichia coli' may fail as explained by the concept of cell suicide. This principle states that a metabolic imbalance is created whenever cells are suddenly transferred to nutrient-rich agar under conditions suitable for enzyme activity. As a result, free radicals and superoxide are immediately produced.

Author: Dodd, Christine E.R., Booth, Ian R., Stewart, Gordon S.A.B., Bloomfield, Sally F., Power, E.G.M.
Publisher: Society for General Microbiology
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1998
Analysis, Physiological aspects, Cell death, Bacteria, Cell culture, Tissue culture

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Use of single-strand conformation of polymorphism analysis to examine the variability of the rpoS sequence in environmental isolates of Salmonellae

Article Abstract:

The rpoS gene of Salmonella enterica can vary significantly among subspecies, with most changes occurring at the center and near the end of the coding region. This gene produces a sigma factor that permits the bacterium to adapt to stress.

Author: Dodd, Christine E.R., Stewart, Gordon S.A.B., Jordan, Suzanne J.
Publisher: American Society for Microbiology
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1999
Salmonella, Genetic polymorphisms

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Subjects list: Research
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