WordNet

a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite (同)K, atomic number 19
indicating the first or earliest or original; "`proto is a combining form in a word like `protolanguage that refers to the hypothetical ancestor of another language or group of languages"
a stable particle with positive charge equal to the negative charge of an electron

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1. 腎尿細管性アシドーシスの概要と病態生理、およびカリウムバランスへの影響 overview and pathophysiology of renal tubular acidosis and the effect on potassium balance
2. 酸関連疾患治療のためのプロトンポンプ阻害剤の概要および比較 overview and comparison of the proton pump inhibitors for the treatment of acid related disorders
3. 赤血球水分量の制御 control of red blood cell hydration
4. 化生（慢性）萎縮性胃炎 metaplastic chronic atrophic gastritis
5. 成人における高カリウム血症の原因および評価 causes and evaluation of hyperkalemia in adults

Proton-Potassium (H(+)/K(+)) ATPases: Properties and Roles in Health and Diseases.

Sakai H1, Fujii T2, Takeguchi N3.
Metal ions in life sciences.Met Ions Life Sci.2016;16:459-83. doi: 10.1007/978-3-319-21756-7_13.
As a physiological phenomenon, acid secretion from the stomach was known already at least in the 17th century. But its mechanism was elucidated in more recent times only. At the end of the 20th century, gastric H(+)/K(+)-ATPase in the parietal cells was found to be responsible for a final step of H(
PMID 26860309

The effects of manganese (II) but not nickel (II) ions on Enterococcus hirae cell growth, redox potential decrease, and proton-coupled membrane transport.

Vardanyan Z1, Trchounian A.
Cell biochemistry and biophysics.Cell Biochem Biophys.2013;67(3):1301-6. doi: 10.1007/s12013-013-9662-0.
Enterococcus hirae grow well under anaerobic conditions by fermenting glucose, accompanied with the decrease of oxidation-reduction potential (Eh) from positive values to negative ones. It was shown that heavy metals-copper and iron ions-affect E. hirae growth and alter Eh and proton-potassium ions
PMID 23712873