21.   Pure oxygen.

22.   Sedated patients, who breath more slowly than normal, may need additional air, but not necessarily pure oxygen, unless they are acutely ill.

23.   The month-long treatment requires patients to sit in a hyperbaric chamber wearing helmets flooded with pure oxygen in an attempt to destroy the bacteria.

24.   The tank simulates an underwater environment, and when a player is placed inside, he breathes pure oxygen.

25.   They are more likely to strike smokers, can be triggered by alcohol and can often be soothed by breathing pure oxygen.

26.   For two hours, everyone has been breathing pure oxygen to help combat the effects of flying unusually high to avoid Taliban anti-aircraft fire.

27.   Half were given high-pressure pure oxygen and half got air pressurized to the lowest pressure that can be felt.

28.   Miss Alley particularly likes the magic that pure oxygen works on her complexion, said publicist Nancy Kane.