Membrane capacity of squid giant axon during hyper- and depolarizations

1976 ◽  
Vol 27 (1) ◽  
pp. 21-39 ◽  
Author(s):  
Shiro Takashima
Keyword(s):  
Giant Axon ◽  
Squid Giant Axon ◽  
Membrane Capacity

scholarly journals The Effects of Several Alcohols on the Properties of the Squid Giant Axon

1964 ◽  
Vol 48 (2) ◽  
pp. 265-277 ◽  
Author(s):  
Clay M. Armstrong ◽  
Leonard Binstock
Keyword(s):  
Potassium Conductance ◽  
Membrane Conductance ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Sodium Ion ◽  
Ion Current ◽  
Resting Potential ◽  
Membrane Capacity ◽  
Monomolecular Films ◽  
Steady State Inactivation

The effects of several alcohols on the resting potential, action potential, and voltage-clamp currents of the squid giant axon have been measured. All the alcohols employed are similar in that they depress maximum sodium conductance much more than maximum potassium conductance. Octyl alcohol differs from the others (C2 through C5) in that it has less tendency to depolarize the axon. Depolarization is always accompanied by a decrease of gK near the resting potential, such that the ratio gK/gleak is decreased. Steady-state inactivation of the sodium ion current is unaffected by alcohols, as is membrane capacity. Resting membrane conductance is usually decreased by alcohols. The findings are discussed in relation to work on monomolecular films.

scholarly journals TRANSVERSE IMPEDANCE OF THE SQUID GIANT AXON DURING CURRENT FLOW

1941 ◽  
Vol 24 (4) ◽  
pp. 535-549 ◽  
Author(s):  
Kenneth S. Cole ◽  
Richard F. Baker
Keyword(s):  
Current Flow ◽  
Membrane Conductance ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Impedance Change ◽  
Electrical Characteristics ◽  
Ion Permeability ◽  
Membrane Capacity ◽  
Maximum Value ◽  
Capacity Change

The change in the transverse impedance of the squid giant axon caused by direct current flow has been measured at frequencies from 1 kc. per second to 500 kc. per second. The impedance change is equivalent to an increase of membrane conductance at the cathode to a maximum value approximately the same as that obtained during activity and a decrease at the anode to a minimum not far from zero. There is no evidence of appreciable membrane capacity change in either case. It then follows that the membrane has the electrical characteristics of a rectifier. Interpreting the membrane conductance as a measure of ion permeability, this permeability is increased at the cathode and decreased at the anode.

Neurofilaments and Paired Helical Filaments

1985 ◽  
Vol 43 ◽  
pp. 740-743
Author(s):  
J. Metuzals
Keyword(s):  
Animal Model ◽  
Posttranslational Modifications ◽  
Posttranslational Modification ◽  
Giant Axon ◽  
Paired Helical Filaments ◽  
Squid Giant Axon ◽  
In Vitro Experiments ◽  
Thin Sections ◽  
Structural Relationships

It has been demonstrated that the neurofibrillary tangles in biopsies of Alzheimer patients, composed of typical paired helical filaments (PHF), consist also of typical neurofilaments (NF) and 15nm wide filaments. Close structural relationships, and even continuity between NF and PHF, have been observed. In this paper, such relationships are investigated from the standpoint that the PHF are formed through posttranslational modifications of NF. To investigate the validity of the posttranslational modification hypothesis of PHF formation, we have identified in thin sections from frontal lobe biopsies of Alzheimer patients all existing conformations of NF and PHF and ordered these conformations in a hypothetical sequence. However, only experiments with animal model preparations will prove or disprove the validity of the interpretations of static structural observations made on patients. For this purpose, the results of in vitro experiments with the squid giant axon preparations are compared with those obtained from human patients. This approach is essential in discovering etiological factors of Alzheimer's disease and its early diagnosis.

Injury-induced vesiculation and membrane redistribution in squid giant axon

1990 ◽  
Vol 1023 (3) ◽  
pp. 421-435 ◽  
Author(s):  
Harvey M. Fishman ◽  
Kirti P. Tewari ◽  
Philip G. Stein
Keyword(s):  
Giant Axon ◽  
Squid Giant Axon

Anterograde Transport of Peptide-Conjugated Fluorescent Beads in the Squid Giant Axon Identifies a Zip-Code for the Synapse

2004 ◽  
Vol 207 (2) ◽  
pp. 164-164
Author(s):  
Michael P. Conley ◽  
Marcus K. Jang ◽  
Joseph A. DeGiorgis ◽  
Elaine L. Bearer
Keyword(s):  
Giant Axon ◽  
Squid Giant Axon ◽  
Anterograde Transport ◽  
Fluorescent Beads ◽  
Zip Code

scholarly journals Determination of Transmembrane Protein with Diazotized (125I)-Iodosulfanilic Acid in the Squid Giant Axon

1978 ◽  
Vol 54 (6) ◽  
pp. 310-315 ◽  
Author(s):  
Tohru YOSHIOKA ◽  
Toshifumi TAKENAKA ◽  
Hidenori HORIE ◽  
Hiroko INOUE ◽  
Kimie INOMATA
Keyword(s):  
Transmembrane Protein ◽  
Giant Axon ◽  
Squid Giant Axon

Gene Expression in the Squid Giant Axon: Neurotransmitter Modulation of RNA Transfer From Periaxonal Glia to the Axon

2002 ◽  
Vol 203 (2) ◽  
pp. 189-190 ◽  
Author(s):  
Antonio Giuditta ◽  
Maria Eyman ◽  
Barry B. Kaplan
Keyword(s):  
Gene Expression ◽  
Giant Axon ◽  
Squid Giant Axon

Ribosomes and polyribosomes are present in the squid giant axon: an immunocytochemical study

Neuroscience ◽  
1999 ◽  
Vol 90 (2) ◽  
pp. 705-715 ◽  
Author(s):  
J.R Sotelo ◽  
A Kun ◽  
J.C Benech ◽  
A Giuditta ◽  
J Morillas ◽  
...  
Keyword(s):  
Giant Axon ◽  
Squid Giant Axon ◽  
Immunocytochemical Study

Electrophysiological Properties of Squid Giant Axon Schwann Cells.

1991 ◽  
Vol 633 (1 Glial-Neurona) ◽  
pp. 607-609 ◽  
Author(s):  
N. JOAN ABBOTT ◽  
Y. PICHON ◽  
E. R. BROWN ◽  
I. INOUE ◽  
F. KUKITA ◽  
...  
Keyword(s):  
Schwann Cells ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Electrophysiological Properties
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