title: Recent improvement in hypoxia warning systems.
mesh_terms: D000337:Aerospace Medicine / Q000295:instrumentation*; D000401:Aircraft; D018504:Ecological Systems, Closed / Q000295:instrumentation; D004581:Electronics; D000860:Hypoxia / Q000517:prevention & control*; D008564:Membrane Potentials; D011048:Polarography / Q000295:instrumentation; D011482:Protective Devices; D013026:Space Flight; D013696:Temperature