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Cellular protein, pH, dissolved oxygen concentration, and static surface tension were measured during growth of Thiobacillus acidophilus on elemental sulfur in the absence and presence of up to 5,000 mg of Tween 80 per liter. The decrease in pH and the increase in sulfate production were observed to be less accurate measurements of growth when compared with the increase in cellular protein. The doubling time of the bacterium decreased approximately 50% with the addition of 500 mg of Tween 80 per liter. The bacteria did not appear to synthesize any wetting agents as demonstrated by the constant surface tension of the medium during growth. Morphological alterations in the presence of Tween 80 were also observed.

Autotrophic Growth of Thiobacillus acidophilus in the Presence of a Surface-Active Agent, Tween 80