PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS

The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitdla 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...

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Main Authors: Kishimoto, Hiromici-ii Akabori
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 1958
Subjects:
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.282.2892
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spelling ftciteseerx:oai:CiteSeerX.psu:10.1.1.282.2892 2023-05-15T17:23:50+02:00 PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS Kishimoto Hiromici-ii Akabori The Pennsylvania State University CiteSeerX Archives 1958 application/zip http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.282.2892 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.282.2892 Metadata may be used without restrictions as long as the oai identifier remains attached to it. ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/8b/83/J_Gen_Physiol_1959_Jul_20_42(6)_1167-1183.tar.gz text 1958 ftciteseerx 2016-01-07T21:07:53Z The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitdla 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. 0nly 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 Q10 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 protoplasmic streaming of Characeae cells is a typical cyclosis with a constant, uniform speed (i.e., 50 to 100 microns per second normally). On stimulation either electrically or mechanically, the flow stops suddenly, but recovers gradually before long. It has been well established by many authors; Text Nitella flexilis Unknown
institution Open Polar
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description The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitdla 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. 0nly 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 Q10 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 protoplasmic streaming of Characeae cells is a typical cyclosis with a constant, uniform speed (i.e., 50 to 100 microns per second normally). On stimulation either electrically or mechanically, the flow stops suddenly, but recovers gradually before long. It has been well established by many authors;
author2 The Pennsylvania State University CiteSeerX Archives
format Text
author Kishimoto
Hiromici-ii Akabori
spellingShingle Kishimoto
Hiromici-ii Akabori
PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS
author_facet Kishimoto
Hiromici-ii Akabori
author_sort Kishimoto
title PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS
title_short PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS
title_full PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS
title_fullStr PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS
title_full_unstemmed PROTOPLASMIC STREAMING OF AN INTERNODAL CELL OF NITELLA FLEXILIS*, ITS CORRELATION WITH ELECTRIC STIM-ULUS
title_sort protoplasmic streaming of an internodal cell of nitella flexilis*, its correlation with electric stim-ulus
publishDate 1958
url http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.282.2892
genre Nitella flexilis
genre_facet Nitella flexilis
op_source ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/8b/83/J_Gen_Physiol_1959_Jul_20_42(6)_1167-1183.tar.gz
op_relation http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.282.2892
op_rights Metadata may be used without restrictions as long as the oai identifier remains attached to it.
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