title: Study of man during a 56-day exposure to an oxygen-helium atmosphere at 258 mm. Hg total pressure. II. Major and minor atmospheric components.
mesh_terms: D000328:Adult; D000337:Aerospace Medicine; D000397:Air Pollution; D001274:Atmospheric Pressure; D018504:Ecological Systems, Closed; D005740:Gases / Q000032:analysis*; D006371:Helium / Q000032:analysis*; D006801:Humans; D008297:Male; D010100:Oxygen / Q000032:analysis*
chemical_list: D005740:Gases; D006371:Helium; D010100:Oxygen