The presence of N2-fixing bacteria in the intestines of man and animals.
D000114:Acetylene / Q000378:metabolism; D000818:Animals; D004755:Enterobacteriaceae / Q000302:isolation & purification; D004926:Escherichia coli / Q000302:isolation & purification; D006168:Guinea Pigs; D006801:Humans; D007422:Intestines / Q000382:microbiology*; D007709:Klebsiella / Q000302:isolation & purification* / Q000378:metabolism; D009586:Nitrogen Fixation; D013552:Swine
D000114:Acetylene