title: Study of man during a 56-day exposure to an oxygen-helium atmosphere at 258 mm. Hg total pressure. X. Enteric microbial flora.
mesh_terms: D000328:Adult; D001274:Atmospheric Pressure; D018504:Ecological Systems, Closed; D013293:Enterococcus faecalis / Q000254:growth & development; D004926:Escherichia coli / Q000254:growth & development; D005243:Feces / Q000382:microbiology; D006371:Helium; D006801:Humans; D007422:Intestines / Q000254:growth & development*; D007778:Lactobacillus / Q000254:growth & development; D008297:Male; D010100:Oxygen
chemical_list: D006371:Helium; D010100:Oxygen