∞ generated and posted on 2016.01.01 ∞

Positively charged subatomic particle making up a substantial portion of all atomic nuclei.

In biology the proton is especially known a hydrogen ion, that is, a hydrogen atom that has been stripped of its electron. Hydrogen ions are defining components of the proton motive force, which is a key component of cellular respiration as well as the light reaction of photosynthesis.

Protons are also transferred along with electrons in oxidation-reduction reactions in general as they occur within cells (see dehydrogenation).

Protons are also relevant biologically in the guise of , which is a kind of ionizing radiation. Medically, beta radiation is occasionally used to destroy that are found close the surface of the body, reflecting the poor penetrating ability of protons, of which beta radiations consists.

See also neutron.