Nitrogen Fixation by New Species of Nocardia

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Abstract
SUMMARY: Two new species of the genus Nocardia (Trev.) have been isolated from the soil of chalk grassland. One of these, Nocardia calcarea n.sp., fixes atmospheric nitrogen in culture in amounts of 2–4.5 mg. N/g. glucose, sucrose or mannitol present in the medium. The second species, N. cellulans n.sp., decomposes cellulose in culture and fixes atmospheric nitrogen in culture using glucose, sucrose, mannitol and cellulose as carbon source; amounts of 12 mg. N fixed/g. cellulose decomposed were recorded. The properties of nitrogen fixation and cellulose decomposition have not previously been recorded for this genus. The two organisms are described.

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