Adaptive responses of Salmonella enterica serovar Typhimurium DT104 and other S. Typhimurium strains and Escherichia coli O157 to low pH environments
| Autor: | W. S. Ritmeester, R. de Jonge, F.M. van Leusden |
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| Rok vydání: | 2003 |
| Předmět: |
Salmonella typhimurium
Salmonella Arginine Escherichia coli O157 medicine.disease_cause Applied Microbiology and Biotechnology Microbiology medicine Humans Amino Acids Escherichia coli chemistry.chemical_classification biology Cell Membrane Fatty Acids Fatty acid General Medicine Hydrogen-Ion Concentration biology.organism_classification Adaptation Physiological Enterobacteriaceae Culture Media Amino acid Proton-Translocating ATPases chemistry Salmonella enterica Food Microbiology Bacteria Biotechnology |
| Zdroj: | Journal of Applied Microbiology. 94:625-632 |
| ISSN: | 1365-2672 1364-5072 |
| DOI: | 10.1046/j.1365-2672.2003.01875.x |
| Popis: | Aims: Cattle are a known main reservoir for acid-resistant Escherichia coli O157 and Salmonella enterica serovar Typhimurium DT104. We studied the response of S. Typhimurium DT104 to extreme low pH environments and compared their response to that of acid-resistant E. coli O157 and other S. Typhimurium phage types. Methods and Results: Bacteria were grown in nutrient-rich medium and subsequently acid challenged at pH 2·5. We found that stationary phase cultures of various S. Typhimurium strains were able to survive a challenge for 2 h at pH 2·5. As in E. coli, the ability of S. Typhimurium to survive at pH 2·5 was shown to be dependent on the presence of amino acids, specifically arginine. The amount of proton pumping H+/ATPase, both in E. coli O157 and S. Typhimurium strains, was lower when grown at pH values |
| Databáze: | OpenAIRE |
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