1.   At the same time, the low oxygen level causes blood pressure to shoot up.

2.   Donner asked him a series of questions designed to test if his mental capacity had been diminished by low oxygen and high altitudes.

3.   Early stages of an investigation by the state of Illinois and Richmond, Virginia-based Reynolds revealed a low oxygen level at the construction site.

4.   Female rats are better able to breathe in low oxygen than male rats, especially when their progesterone levels are highest.

5.   Heart patients, infants and people with asthma could suffer from the low oxygen supply, he said.

6.   High pressure in the brain and low oxygen are thought to set off the overproduction of glutamate.

7.   Low oxygen in their burrows is one possibility, although the worms can survive in water for a time.

8.   Mott said that runoff from the rain and snow that reaches the harbor has very low oxygen levels.

9.   Mud packed around the trees created a low oxygen condition that kept bacteria and fungus from decaying the wood.

10.   Nut grass likes moist soil with low oxygen movement and little competition from other plants.