The ability of Nitella to distinguish electrically between Na(+) and K(+) (potassium effect) appears to depend on several organic substances (or groups of substances). Of these R(MK) and R(SK) determine the mobility and partition coefficient (S) respectively of K(+) while R(MNa) and R(SNa) do the same for Na(+). These substances can vary independently and this variation is susceptible to experimental control.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2237937PMC
http://dx.doi.org/10.1085/jgp.23.4.429DOI Listing

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