Abstract
Cultures of Thiomicrospira pelophila, Thiobacillus thioparus and Thiobacillus neapolitanus were grown in thiosulfate-limited chemostats in a mineralsthiosulfate medium with and without organic supplements. Acetate, succinate and mixtures of amino acids increased the dry weight by 12–24% and the protein by 11–38%. Addition of both acetate and succinate had a cumulative effect. Saccharose, glucose, fructose, ribose, glycerol, glycerate, pyruvate, lactate or malate were without effect. The increase in dry weight of T. neapolitanus by 14C-acetate was directly related to the relative contribution of this compound to the total cell carbon.
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