1.   There was a small explosion in the nitrogen cooling tanks.

2.   After a few days, when the cells have divided several times, the embryo is frozen in liquid nitrogen tanks to be preserved for later implantation.

3.   But Dresser says the idea of keeping a species alive in a nitrogen tank rather than in the wild will never be appealing.

4.   Officials with Wyman-Gordon Metal Forging Inc. said the victims were working on high-pressure nitrogen tanks.

5.   A nitrogen tank may have been mistaken for an oxygen tank, said Bob Miles, an assistant fire chief from nearby Washington Township.

6.   A nitrogen tank may have been mistaken for an oxygen tank, said Bob Miles, an assistant fire chief.

7.   Authorities said a maintenance worker removed a fitting from an empty oxygen tank and used it as an adapter to connect the nitrogen tank.

8.   Life support systems aboard the capsule include dehumidifiers to remove perspiration and respiration moisture, oxygen and nitrogen tanks to provide breathable air and a solid waste disposal unit.

9.   Schenck said the employee removed a fitting from an oxygen tank, put it on the nitrogen tank and connected it to the oxygen system.

10.   Schenck and other officials refused to identify the employee and said that the nitrogen tank was accidentally delivered to the nursing home.