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A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009606 · MeSH 2026。
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