Compared to about 52 percent of the narwhal's oxygen store
being used up during normal dives, the mammals used up to 97 percent of their oxygen store
on escape dives of similar depths and duration.
Doors to the station's oxygen store
opening and closing on their own.
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The team identified a distinctive molecular signature of the oxygen-binding protein myoglobin in the sperm whale and other diving mammals, which allowed them to trace the evolution of the muscle oxygen stores
in more than 100 mammalian species, including their fossil ancestors.
Chile John Dow, chairman of the mine operator Pike River Coal Ltd, said each miner carried 30 minutes' oxygen supply - enough to reach oxygen stores
in the mine that he said would allow them to survive for several days.
John Dow, chairman of mine operator Pike River Coal, said each miner carried 30 minutes of oxygen - enough to reach oxygen stores
in the mine that he said would allow them to survive for "several days".
John Dow, the chairman of Pike River mine, said each miner carried up to 60 minutes of oxygen, enough to reach oxygen stores
in the mine that would allow them to survive for "several days".
It appears that the whales dive so long that they use up most of their oxygen stores
and need to resort to anaerobic metabolism for part of their dives.
A positive relationship between a dive and the preceding surface time suggests that the birds remain on the surface for a period of time prior to the dive loading their oxygen stores
and will dive until their oxygen stores
are depleted, this is called anticipatory breathing.
Meanwhile, special oxygen stores
in their muscles, which they "charge" at the surface, allow them to hunt at depth for over an hour.
The penguins also ration these oxygen stores
using physiological tricks unavailable to landlubbers.
Thus turtles optimise their diving behaviour to ensure limited oxygen stores
are used in a cost-efficient way, maximising their time at depth.