| protonitrate |
(pro
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| proton |
an elementary particle of positive charge which forms the nucleus of the ordinary hydrogen atom of mass 1; along with neutrons, protons form the nuclei of atoms of all other elements. The proton is the unit of positive electricity; it has one quantum of charge (1.6 ×10-19 coulomb), equivalent to the electron but of opposite polarity, and its mass is 1.67 ×10-27 kilogram, approximately that of the hydrogen ion. Symbol p.
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| proton p. |
a system for transporting protons across cell membranes, often exchanging them for other positively charged ions; it may be driven by energy supplied by ATP metabolism, light, or a flow of electrons. See also H+,K+-ATPase.
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| proton pump i. |
gastric acid pump i.
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| proton t. |
tautomerism in which an acidic proton is transferred from one position to another in the same molecule, e.g., keto-enol tautomerism. Called also prototropy.
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