Abstract
Early estimations of pH values in plant cells were based upon determinations of the electromotive force (EMF) developed between a standard hydrogen electrode and the fluid expressed from crushed tissues or liberated by cutting large algal cells such as those of Valonia, Chara or Nitella. These EMF values were then translated into terms of hydrogen ion concentration on the assumption that the numerical value of the EMF in volts depended entirely upon the concentration of hydrogen ions. Then hydrogen ion concentration measured in this way was found to act in biological reactions, mainly enzyme activity, in such a way that the apparent hydrogen ion concentration was related logarithmically to the process investigated. So Sörensen in 1909 introduced the pH scale based upon what he called the “hydrogen-ion exponent.” He defined pH+ as \({1 \over {\left( {\log {P_{{H^ + }}}} \right)}}\) (1909, p. 28, not p. 4) and pH+ became pH as a matter of typographical convenience.
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© 1955 Springer-Verlag in Vienna
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Small, J. (1955). The pH of Plant Cells. In: The pH of Plant Cells The pH of Animal Cells. Protoplasmatologia, vol 2 / B/2 / c. Springer, Vienna. https://doi.org/10.1007/978-3-7091-5451-9_1
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