FIG. 3.

Arsenite, arsenate, and antimonite resistance of Halobacterium sp. strains NRC-1 (solid symbols) and SK402 (open symbols). Growth with different concentrations of sodium arsenite (A), sodium arsenate (B) and antimony potassium tartrate (C) is plotted. Original cultures of each single colony from NRC-1 and SK402 were induced with 1 μM arsenite and diluted 1:500 into fresh broth with the indicated concentrations of As(III), As(V), or Sb(III). Cell growth was monitored at OD₆₀₀ for 14 days with incubation at 42°C and shaking at 200 rpm. ▪ and □, no addition; ▴ and ▵, 0.1 mM arsenite (A), 10 mM arsenate (B), or 0.05 mM antinomite (C); • and ○, 0.15 mM arsenite (A), 20 mM arsenate (B), or 0.1 mM antinomite (C).