IN previous articles 1–3 attention was directed to the fact that high pressures of pure oxygen have a specific effect on the metabolism of cells of various kinds. In the tissues of higher plants ...

A PaO2 test measures partial pressure of oxygen, or PaO2—the oxygen pressure in arterial blood. The PaO2 reflects how well oxygen is able to move from the lungs to the blood. It is often altered by ...

US President Donald Trump has stepped up his “maximum pressure” campaign on Venezuela’s leader Nicolás Maduro, in a major challenge to the South American nation’s all-important oil industry.