scholarly journals The effect of temperature on the nerve-blocking action of benzyl alcohol on the squid giant axon.

1983 ◽  
Vol 338 (1) ◽  
pp. 51-60 ◽  
Author(s):  
A A Harper ◽  
A G Macdonald ◽  
K T Wann
Keyword(s):  
Benzyl Alcohol ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Effect Of Temperature

scholarly journals Effect of Temperature on the Potential and Current Thresholds of Axon Membrane

1962 ◽  
Vol 46 (2) ◽  
pp. 257-266 ◽  
Author(s):  
Rita Guttman ◽  
Keyword(s):  
Sea Water ◽  
Sucrose Solution ◽  
Giant Axon ◽  
Threshold Current ◽  
Squid Giant Axon ◽  
Effect Of Temperature ◽  
Threshold Potential ◽  
Axon Membrane ◽  
Central Segment ◽  
The Mean

The effect of temperature on the potential and current thresholds of the squid giant axon membrane was measured with gross external electrodes. A central segment of the axon, 0.8 mm long and in sea water, was isolated by flowing low conductance, isoosmotic sucrose solution on each side; both ends were depolarized in isoosmotic KCl. Measured biphasic square wave currents at five cycles per second were applied between one end of the nerve and the membrane of the central segment. The membrane potential was recorded between the central sea water and the other depolarized end. The recorded potentials are developed only across the membrane impedance. Threshold current values ranged from 3.2 µa at 267deg;C to 1 µa at 7.5°C. Threshold potential values ranged from 50 mv at 26°C to 6 mv at 7.5°C. The mean Q10 of threshold current was 2.3 (SD = 0.2), while the Q10 for threshold potentials was 2.0 (SD = 0.1).

scholarly journals THE EFFECT OF TEMPERATURE, POTASSIUM, AND SODIUM ON THE CONDUCTANCE CHANGE ACCOMPANYING THE ACTION POTENTIAL IN THE SQUID GIANT AXON

1957 ◽  
Vol 41 (2) ◽  
pp. 333-342 ◽  
Author(s):  
E. Amatniek ◽  
W. Freygang ◽  
H. Grundfest ◽  
G. Kiebel ◽  
A. Shanes
Keyword(s):  
Time Course ◽  
Giant Axon ◽  
Membrane Resistance ◽  
Squid Giant Axon ◽  
Effect Of Temperature ◽  
Concentration Of Ions ◽  
Temperature Ranges ◽  
Conductance Changes ◽  
Lower Temperature ◽  
Possible Cause

Conductance changes associated with the response of the squid giant axon have been studied at two temperature ranges (26–27°C.; 9–10°C.) and with modified concentrations of sodium and potassium in the medium. The phase of "initial after-conductance," during which the membrane resistance increases above the resting value, is smaller at the lower temperature. At both temperature ranges it is diminished by doubling K+ in the medium and enhanced by removal of K+. Halving the Na+ of the medium also enhances this phase when K+ is absent, but not otherwise. The time course of the conductance changes alters in form with changes of the external medium. These changes indicate independent changes in the complex of ionic events associated with the response. The experiments therefore confirm the reality of the phase of increased membrane resistance. The magnitude of this change appears to be considerable and requires a transient decrease in the mobility and/or concentration of ions in the membrane. The possible cause of this decrease is discussed.

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

scholarly journals Theoretical Effect of Temperature on Threshold in the Hodgkin-Huxley Nerve Model

1966 ◽  
Vol 49 (5) ◽  
pp. 989-1005 ◽  
Author(s):  
Richard Fitzhugh
Keyword(s):  
Relaxation Time ◽  
Relaxation Times ◽  
Giant Axon ◽  
Temperature Curve ◽  
Effect Of Temperature ◽  
Threshold Temperature ◽  
Ionic Conductances ◽  
And Shifts ◽  
The Right ◽  
Increasing Temperature

In the squid giant axon, Sjodin and Mullins (1958), using 1 msec duration pulses, found a decrease of threshold with increasing temperature, while Guttman (1962), using 100 msec pulses, found an increase. Both results are qualitatively predicted by the Hodgkin-Huxley model. The threshold vs. temperature curve varies so much with the assumptions made regarding the temperature-dependence of the membrane ionic conductances that quantitative comparison between theory and experiment is not yet possible. For very short pulses, increasing temperature has two effects. (1) At lower temperatures the decrease of relaxation time of Na activation (m) relative to the electrical (RC) relaxation time favors excitation and decreases threshold. (2) For higher temperatures, effect (1) saturates, but the decreasing relaxation times of Na inactivation (h) and K activation (n) factor accommodation and increased threshold. The result is a U-shaped threshold temperature curve. R. Guttman has obtained such U-shaped curves for 50 µsec pulses. Assuming higher ionic conductances decreases the electrical relaxation time and shifts the curve to the right along the temperature axis. Making the conductances increase with temperature flattens the curve. Using very long pulses favors effect (2) over (1) and makes threshold increase monotonically with temperature.

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
Sign in / Sign up

Export Citation Format

Share Document