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K + and Na + influxes in Nitella modified by pH and electric current
Author(s) -
Williams E. J.,
Dale N.,
Trites L. F.,
Fensom D. S.
Publication year - 1984
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1984.tb00373.x
Subject(s) - nitella , current (fluid) , electric current , electrolyte , ion , charge carrier , chemistry , analytical chemistry (journal) , physics , biophysics , condensed matter physics , biology , environmental chemistry , thermodynamics , electrode , organic chemistry , quantum mechanics
K + and Na + influxes into Nitella translucens Agardh in buffered artificial pond water have been measured in the pH range 5.7 to 8.1 with and without sub‐threshold electric current. For pH levels below 7 the results confirm previous observations that neither ion is a major carrier of membrance current. At pH levels greater than 7 the effect of applied current is generally to depress cation influx. It is argued that this is evidence in favour of OH − being the principal charge carrier under these conditions. Observations of the effects of OH − gradients on K + influx tend to support this hypothesis.