| spirochaeta perfilievii sp. nov., an oxygen-tolerant, sulfide-oxidizing, sulfur- and thiosulfate-reducing spirochaete isolated from a saline spring. | a novel strain of fermenting, aerotolerant, chemo-organoheterotrophic spirochaete designated p(t) was isolated from a sulfur 'thiodendron' mat in a saline spring at the staraya russa resort (novgorod region, russia). cells of strain p(t) exhibited a helical shape. the spirochaete required sulfide in the growth medium and was able to oxidize it non-enzymically to elemental sulfur via the interaction of h(2)o(2) with sulfide and deposit it in the periplasmic space. growth occurred at 4-32 °c (opti ... | 2011 | 20173011 |