Periodic Pattern of Electric Potential in Chara Internodal Cell

Kenshi Hayashi, Takanori Fujiyoshi, Kiyoshi Toko, Kaoru Yamafuji

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A spatial pattern of the electric potential formed by a characean internodal cell is investigated experimentally. A multi-electrode measuring system is used to pursue the dynamic properties of the pattern. It is shown that periodic low-potential regions are formed after the entire transient increase over the cell when the light is imposed on. Under constant illumination an electric oscillation is found. These experimental data are also discussed by the use of a spectrum analysis; the formation of the pattern is a bifurcation phenomenon of soft-mode instability realizing far from equilibrium, accompanied by sharpening of spectrum of a particular wave mode. A long-range coherence extending over 1 cm is also shown to exist in the high-potential region, where protons are extruded by H+-ATPase molecules existing within the membrane.

Original languageEnglish
Pages (from-to)810-820
Number of pages11
Journaljournal of the physical society of japan
Issue number2
Publication statusPublished - Jan 1 1987


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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