Photooxidation is significantly reduced at depths beyond which oxygen penetrates.

The oxygen penetrates in depth of the wafer, reacts with silicon and transforms it into silicon oxide.

The idea is to help the oxygen penetrate tissues it cannot reach under normal conditions.

Apart from possible atmospheric effects, many deeper-dwelling marine organisms could not adapt to an ocean where oxygen penetrated only the surface layers.

The purpose is to help oxygen penetrate tissues it cannot normally reach.

So much that very little oxygen penetrates to the burning wood.

They form in stratified environments where oxygen does not penetrate deeper than the immediate surface environment.

During this interval, oxygen from the sea water penetrates the sediments, liberating some of the uranium that is naturally contained there.

If corrosion occurs, it occurs on the outside of the wire, not on the gas-tight contact where oxygen cannot penetrate to form oxides.

Pure oxygen, under pressure, penetrated tissue more effectively, rallied white blood cells to the body's defense.