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. 1977 May;33(5):1079–1084. doi: 10.1128/aem.33.5.1079-1084.1977

Growth of heat-injured Vibrio parahaemolyticus in media supplemented with various cations.

J J Heinis, L R Beuchat, W K Jones
PMCID: PMC170830  PMID: 879768

Abstract

Mid- to late logarithmic growth phase cells of Vibrio parahaemolyticus grown in tryptic soy broth (TSB) containing 0.5, 3.0, and 7.5% NaCl were heated for 8 min at 45 degrees C in 0.1 M phosphate buffer (pH 7.2) containing 3% NaCl. Colony formation on thiosulfate-citrate-bile salts-sucrose agar (TCBS) containing 2% NaCl was greatest for unheated cells that had been grown in 7.5% NaCl-TSB; cells grown in 0.5% NaCl-TSB formed a greater number of colonies on 1.0% NaCl-TCBS. Thermal injury was evident in heated cells, regardless of the NaCl concentration in TSB growth medium. The effects of Mg2+, K+, and Li+ added as chlorides to 0.5% NaCl-TSB on the growth of nonheated and heated V. parahaemolyticus were studied. Lower levels of Mg2+ and slightly higher levels of K+ were required to replace Na+ in TSB inoculated with thermally injured cells that had been originally grown in 3.0 and 7.5% NaCl-TSB. LiCl had an inhibitory effect on both nonheated and heated cells when present in the recovery medium (0.5% NaCl-TSB) at concentrations as low as 0.5%. Increased numbers of colonies were formed by heated cells plated in MgCl2-supplemented TCBS, regardless of the NaCl concentration in the original growth medium. Potassium had little, if any, effect on colony formation by nonheated V. parahaemolyticus recovered on TCBS and may have had a detrimental effect on heat-injured cells.

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Selected References

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