@article{mbs:/content/journal/micro/10.1099/00221287-60-1-61, author = "Bergersen, F. J. and Hipsley, E. H.", title = "The Presence of N2-fixing Bacteria in the Intestines of Man and Animals", journal= "Microbiology", year = "1970", volume = "60", number = "1", pages = "61-65", doi = "https://doi.org/10.1099/00221287-60-1-61", url = "https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-60-1-61", publisher = "Microbiology Society", issn = "1465-2080", type = "Journal Article", abstract = "SUMMARY: Cultures of N2-fixing bacteria have been isolated from the intestinal contents of humans, pigs and guinea-pigs. Acetylene-reduction tests indicate that N2-fixation may be occurring in the intestines. Best N2-fixation was by cultures provisionally identified as Klebsiella aerogenes, but other genera were also involved. All cultures fixed more N2 anaerobically than aerobically but some fixation occurred when 20% O2 was present.", }