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PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS

The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitella flexilis is observed whenever an action potential is elicited. The action potential can be generated by an electric stimulus after its refractory period, whether the flow is at a complete standstill or on th...

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Detalles Bibliográficos
Autores principales: Kishimoto, Uichiro, Akabori, Hiromichi
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1959
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2194956/
https://www.ncbi.nlm.nih.gov/pubmed/13664919
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author Kishimoto, Uichiro
Akabori, Hiromichi
author_facet Kishimoto, Uichiro
Akabori, Hiromichi
author_sort Kishimoto, Uichiro
collection PubMed
description The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitella flexilis is observed whenever an action potential is elicited. The action potential can be generated by an electric stimulus after its refractory period, whether the flow is at a complete standstill or on the way to recovery. The membrane potential is generally decreased more or less when the rate of flow is decreased on application of salts or other agents. There is, however, no parallelism between these two. The membrane potential decreases proportionally with applied voltage of subthreshold intensity, while the rate of flow does not change appreciably. Only on application of a superthreshold voltage does the flow stop suddenly. In one case the rate of flow decreased to half without appreciable decrease in membrane potential. In another case it continued flowing at about one-half rate, although the membrane potential was almost zero. The Q (10) of the rate of flow is about 2, while it is 1.1 to 1.5 for the membrane potential. The sudden cessation of the protoplasmic streaming is supposed to be caused by the temporary formation of certain interlinkages among contractile protein networks in the endoplasm during excitation at the cathodal half of Nitella.
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spelling pubmed-21949562008-04-23 PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS Kishimoto, Uichiro Akabori, Hiromichi J Gen Physiol Article The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitella flexilis is observed whenever an action potential is elicited. The action potential can be generated by an electric stimulus after its refractory period, whether the flow is at a complete standstill or on the way to recovery. The membrane potential is generally decreased more or less when the rate of flow is decreased on application of salts or other agents. There is, however, no parallelism between these two. The membrane potential decreases proportionally with applied voltage of subthreshold intensity, while the rate of flow does not change appreciably. Only on application of a superthreshold voltage does the flow stop suddenly. In one case the rate of flow decreased to half without appreciable decrease in membrane potential. In another case it continued flowing at about one-half rate, although the membrane potential was almost zero. The Q (10) of the rate of flow is about 2, while it is 1.1 to 1.5 for the membrane potential. The sudden cessation of the protoplasmic streaming is supposed to be caused by the temporary formation of certain interlinkages among contractile protein networks in the endoplasm during excitation at the cathodal half of Nitella. The Rockefeller University Press 1959-07-20 /pmc/articles/PMC2194956/ /pubmed/13664919 Text en Copyright © Copyright, 1959, The Rockefeller Institute This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Kishimoto, Uichiro
Akabori, Hiromichi
PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS
title PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS
title_full PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS
title_fullStr PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS
title_full_unstemmed PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS
title_short PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS : ITS CORRELATION WITH ELECTRIC STIMULUS
title_sort protoplasmic streaming of an internodal cell of nitella flexilis : its correlation with electric stimulus
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2194956/
https://www.ncbi.nlm.nih.gov/pubmed/13664919
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