title: Diurnal variations in urinary-alveolar N2 difference and effects of recumbency.
mesh_terms: D000328:Adult; D001274:Atmospheric Pressure; D001831:Body Temperature; D002245:Carbon Dioxide / Q000502:physiology; D002940:Circadian Rhythm; D006801:Humans; D008168:Lung / Q000098:blood supply / Q000502:physiology*; D008297:Male; D009584:Nitrogen / Q000652:urine*; D011187:Posture; D011650:Pulmonary Alveoli / Q000502:physiology; D011652:Pulmonary Circulation; D012119:Respiration; D012890:Sleep
chemical_list: D002245:Carbon Dioxide; D009584:Nitrogen