Abstract
The DNA of 13 yellow-pigmented strains of the genus Thermus, isolated from hot springs in Iceland, had a mean base composition of 60·5 to 65·1 mol % GC. In their growth characteristics and sensitivity to antibiotics, these strains resembled Thermus aquaticus strain yti. Glutamate, acetate and sucrose, with ammonium ions as a nitrogen source, supported growth. The enzymes of the tricarboxylic acid cycle were present and the glyoxylate cycle was constitutive. The stability of malate dehydrogenase in crude extracts was similar to that of strain yti.
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