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...action, and ten times the activity of cimetidine. Ranitidine has 10% the affinity that cimetidine has to [[CYP450]] so it causes fewer side effects, but othe ...by 1988. It has since largely been superseded by the even more effective [[proton pump inhibitor]]s, with [[omeprazole]] becoming the biggest-selling drug fo

Because of its high affinity for oxygen at elevated temperatures, and its ability to reduce water when i [[Image:Beryllium target.jpg|thumb|left|Beryllium target which "converts" a proton beam into a neutron beam]]

...erse) that it can be considered stable. Its four stable isotopes have 82 [[proton]]s, a "magic number" in the [[nuclear shell model]] of [[atomic nuclei]]. ...thylene-diamine-tetracetic acid (EDTA). This chelating agent has a greater affinity for lead than for calcium and so the lead chelate is formed by exchange. Th

...e process can also take place.|[[Acetic acid]], a [[weak acid]], donates a proton (hydrogen ion, highlighted in green) to water in an equilibrium reaction to ...known as the [[conjugate base]] of the acid, and the [[hydrogen ion]] or [[proton]], H⁺, which, in the case of aqueous solutions, exists as a solv

...om and a hydrogen atom is broken by [[heterolytic fission]], which gives a proton and a negative [[ion]]. Dissociation is the opposite of '''association''' a The dissociation of acids in a solution means the split-off of a [[proton]] H⁺, see [[Acid-base reaction theories]]. This is an equilibriu

...rønsted and Lowry]] characterized an acid-base equilibrium as involving a proton exchange reaction:<ref> {{cite book |last=Bell |first=R.P. |title=The Proton in Chemistry |publisher=Chapman & Hall |location=London |year=1973 |edition

...sequence of amino acids may affect crucial functions such as the protein's affinity for oxygen. ...hole complex is initiated, causing the other subunits to gain an increased affinity for oxygen. As a consequence, the oxygen binding curve of hemoglobin is [[S

...acid is not encountered naturally on Earth, due to its great [[Hygroscopy|affinity for water]]. Apart from that, sulfuric acid is a constituent of [[acid rain ...|H|3|SO|4|+}} and {{chem|HSO|4|-}} ions are high due to an intra-molecular proton-switch mechanism (analogous to the [[Grotthuss mechanism]] in water), makin

a proton may hop from one molecule of ethanoic acid on to a water molecule and then ...e [[hydronium ion]] concentration, since the state of [[solvation]] of the proton is constant (in dilute solutions) and so does not affect the equilibrium co

[[Proton]]s in aqueous solution function in the production of ATP in cell [[Organell ...to 1P_i.<ref name=Werner/> Protons (H⁺) decrease the affinity of NPT2 for Na⁺.<ref name=Werner/>

...ing oxidative-phosphorylation. Haem reversibly binds O₂ with an affinity similar to that of the carotid body, suggesting that haem containing protei ...Cl^--HCO₃^-) which decrease it. Changes in proton concentration caused by acidosis (or the opposite from [[alkalosis]]) insid