The influence of pH and external H+ concentration on caesium toxicity and accumulation in Escherichia coli and Bacillus subtilis

Joy Perkins, Geoffrey M. Gadd

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)

    Abstract

    Toxicity screening of Escherichia coli NCIB 9484 and Bacillus subtilis 007, NCIB 168 and NCIB 1650 has shown Cs+ to be the most toxic Group 1 metal cation. However, toxicity and accumulation of Cs+ by the bacteria was affected by two main external factors; pH and the presence of other monovalent cations, particularly K+. Over the pH range 6-9 both E. coli and B. subtilis showed increasing sensitivity towards caesium as the pH was raised. The presence of K+ and Na+ in the laboratory media used lowered caesium toxicity and lowered acumulation of the metal. In order to assess accurately Cs+ toxicity towards the bacterial strains it was therefore necessary to define the K+:Cs+ ratio in the external medium. The minimum inhibitory K+:Cs+ concentration ratio for the Bacillus strains tested was in the range 1:2-1:3 while E. coli had a minimum inhibitory K+:Cs+ concentration ratio of 1:6.

    Original languageEnglish
    Pages (from-to)218-225
    Number of pages8
    JournalJournal of Industrial Microbiology
    Volume14
    Issue number3-4
    DOIs
    Publication statusPublished - 1 Mar 1995

    Keywords

    • Accumulation
    • Bacillus subtilis
    • Caesium
    • Escherichia coli
    • Potassium
    • Toxicity

    ASJC Scopus subject areas

    • Applied Microbiology and Biotechnology

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