ISSN:
1432-072X
Keywords:
Dictyoglomus
;
Fervidothrix
;
Description
;
Rotund bodies
;
Extremely thermophilic
;
Obligate anaerobe
;
Fermentation products
;
Physiology
;
Distribution
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A strain similar to Dictyoglomus thermophilum, isolated from a New Zealand hot spring, is described. This strictly anaerobic, Gram-negative, non-motile and nonsporulating bacterium usually exists as long thin filaments of 5 to 25 μm by 0.35 to 0.45 μm. Rotund bodies are commonly observed. Thin sections of the cells revealed a two-layered cell wall. The optimum temperature and pH for growth was 70°C and 7.0 and 7.5 respectively. No growth was observed at 40°C and 85°C or at pH 4.5 to pH 9.0. The organism fermented glucose, maltose, mannose, xylose, lactose, cellobiose, galactose and sucrose and produced acetate as the major end-product with significant amounts of lactate, H2 and CO2 and only traces of ethanol. The doubling time on glucose was 10 h. The DNA base composition was 29.5% guanine plus cytosine as determined by the thermal denaturation method. Growth was inhibited by penicillin, tetracycline and chloramphenicol indicating that the organism was a eubacterium. These features are in common with the newly described species Dictyoglomus thermophilum to which the New Zealand isolate belongs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00492899
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