Dynamic property of membrane formation in a protoplasmic droplet of nitella

Kiyoshi Toko, Masaaki Nosaka, Masaru Tsukiji, Kaoru Yamafuji

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A theory is presented to explain the dynamic characteristics of an electric potential and the resistance of a surface membrane during the formation of a protoplasmic droplet isolated from Nitella. Basic equations are coupled ones for describing ion concentrations near the surface of the droplet, active and passive ion fluxes on the surface, and kinetics of membrane-constituting molecules diffusing from the inside of the protoplasm. The present results give a good explanation of the observed kinetics of electric properties throughout the formative process of surface membranes after the ion concentrations are replaced by lower ones. The results can also explain well the observed data on the steady state. Oscillatory changes in the membrane potential induced by ions strongly adsorbed on the surface membrane are discussed in relation to growth and regeneration phenomena in biological systems such as bean roots and Acetabularia.

Original languageEnglish
Pages (from-to)295-313
Number of pages19
JournalBiophysical Chemistry
Issue number3-4
Publication statusPublished - Mar 1985
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Organic Chemistry


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