Effect of Metallic Cations
نویسندگان
چکیده
Five metallic cations (Fe3+, Cr3+, Cal+, Mg2+, Mn2+; concentration range, 1.85 X 10-4 to 37 X 10-4 M) were incorporated individually as chlorides into nutrient broth and agar media used for the recovery of phenol-treated Escherichia coli. The effects observed varied with the concentration and the ionic species. In nutrient agar, Fe3+ and Cr3+ were generally beneficial but were toxic at 37 X 10-4 M. Of the divalent ions tested, Ca2 and Mg2+ usually gave higher counts in nutrient broth, except at a concentration of 9.25 X 10-4 M, whereas the effect of Mn2+ was rather variable. Two possible explanations are suggested to explain these effects. Toxic materials may be removed from the media by the precipitates formed on the addition of Fe3+ or Cr3+, or, in the case of the divalent ions, the integrity of the bacterial cell membranes may be maintained.
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