File photo: The Benjamin Franklin Bridge spanning the Delaware River between Camden N.J., foreground, and Philadelphia is seen, Wednesday, Feb. 10, 2021. (AP Photo/Matt Rourke) From Philly and the Pa.

Chronic wounds often spiral out of control because oxygen can’t reach the deepest layers of injured tissue. A new gel developed at UC Riverside delivers a continuous flow of oxygen right where it’s ...

Nighttime drops in ocean oxygen raise energy use in small reef fish. Repeated stress could affect reef health as oceans warm.

Blood oxygen levels refer to the amount of oxygen circulating in the blood. Normal blood oxygen levels fall between 75 and 100 millimeters of mercury (mm Hg) on arterial blood gas (ABG) test results.

Millions of years ago, something remarkable happened in Earth’s oceans. Marine animals began to live in deeper parts of the sea, where life had not been possible before. New research shows that this ...