The acid tolerance response of Salmonella typhimurium provides protection against organic acids

Article Abstract:

Salmonella typhimurium exhibits acid tolerance responses (ATRs) when exposed to low pH levels and non-acidic environments during pathogenesis. The exposure of Salmonella typhimurium butyric, acetic and propionic acids activate complex ATR defense mechanism which reduced pH-related damage. Furthermore, the ATR mechanism of the microbe was activated upon exposure to environments with a pH of 4.4. However, the efficiency of the ATR mechanism in Salmonella typhimurium was affected by mutations in the rpoS and fur genes.

Microbial metabolism, Salmonella typhimurium

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Mechanisms of acid resistance in enterohemorrhagic Escherichia coli

Article Abstract:

The glutamate-dependent system and the acid-induced arginine-dependent system protect enterohemorrhagic Escherichia coli against the bactericidal effects of acids in the stomach and intestine. The acid-induced oxidative system is less effective. The arginine- and the glutamate-dependent systems are effective against weak acids such as benzoic acid and a volatile fatty acid mixture. The acid resistance systems remain effective for prolonged periods of cold storage at four degree celsius.

Escherichia coli, Acids

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The rpoS-dependent starvation-stress response locus stiA encodes a nitrate reductase (narZYWV) required for carbon-starvation-inducible thermotolerance and acid tolerance in Salmonella typhimurium

Article Abstract:

Research was conducted to identify the enzymes involved in the long-term-starvation survival of Salmonella typhimurium. Results indicate that nitrate reductase enzyme, regulated by narZYWV operon, plays a central role in the physiology of starved and stressed cells.

International, Usage, Testing, Observations, Bacteria, Bacteriophages, Virulence (Microbiology), Biocompatibility

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