Ref ID : 1258
Terry M. Williams and Richard F. Unz; The nutrition of Thiothrix, Type 021N, Beggiatoa and Leucothrix strains. Water Research 23(1):15-22, 1989
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Filamentous sulfur bacteria (Thiothrix, Beggiatoa and Type 021N) and Leucothirx sp. were studied to determine their carbon and nitrogen requirements and growth response to nutrient concentration and salinity. Two Thiothrix strains required both a reduced sulfur compound and organic carbon source for growth. Others grew heterotrophically on organic acids or fructose-related sugars. Thiothrix isolates differed in regard to salinity tolerance. Type 021N bacteria utilized various sugars, amino acids and organic acids as sole carbon sources. Amino acids, but not nitrate, satisfied the nitrogen requirements for most strains. The Beggiatoa isolate utilized only simple organic acids and alcohols, and was inhibited by 0.3% concentrations of various salts. Strains of wastewater Leucothrix utilized various carbon and nitrogen compounds for growth. Low levels of lactate, ammonium and phosphate supported maximum growth of Thiothrix, Beggiatoa and Type 021N, but not Leucothirx strains. The optimum pH for growth initiation of the majority of bacteria was pH 7.0-7.5.