这个词是什么意思？
The process in certain BACTERIA; FUNGI; and CYANOBACTERIA converting free atmospheric NITROGEN to biologically usable forms of nitrogen, such as AMMONIA; NITRATES; and amino compounds.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009586 · MeSH 2026。
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