In addition, the cells use an NADPH oxidase (an enzyme in the cell membrane) to release reactive oxygen species as further ...

Oxygen, for example, has eight protons ... They did this by first firing another isotopic element, calcium-48, at a ball of ...

However, this method has been limited by the high cost of injecting high-purity oxygen gas and the practical ... borohydride (NaBH₄), and meso-sized calcium carbonate (CaCO₃) particles ...

Respiratory system Deliver oxygen for respiration and remove waste ... Store and release calcium. Specialised to: Respond to internal and external stimuli and conditions. Carry messages for ...