scholarly journals Asymmetrical displacement currents (reply)

Nature ◽  
1978 ◽  
Vol 271 (5645) ◽  
pp. 587-587
Keyword(s):  
Displacement Currents ◽  
Asymmetrical Displacement

Fractionation of the asymmetry current in the squid giant axon into inactivating and non-inactivating components

1982 ◽  
Vol 215 (1200) ◽  
pp. 375-389 ◽  
Keyword(s):  
Conformational Changes ◽  
Time Course ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Gating System ◽  
Nerve Membrane ◽  
Positive Voltage ◽  
The Asymmetry ◽  
Displacement Currents ◽  
Asymmetrical Displacement

The operation of the voltage-sensitive sodium gating system in the nerve membrane involves conformational changes that are accompanied by small asymmetrical displacement currents. The asymmetry current may be divided into a component that is inactivated by positive voltage-clamp pulses, and recovers from inactivation with exactly the same time course as the sodium conductance, and one that is not inactivated. A method is described for recording the two components separately with the aid of an inactivating prepulse. They appear to have a marked difference in their rising phases, that of the non-inactivating component being just about as fast as the imposed step in membrane potential, while the inactivating component requires some tens of microseconds to reach its peak.

Sodium gating currents in Myxicola giant axons

1976 ◽  
Vol 193 (1113) ◽  
pp. 469-475 ◽  
Keyword(s):  
Giant Axon ◽  
Gating Currents ◽  
Giant Axons ◽  
Displacement Currents ◽  
Asymmetrical Displacement

Asymmetrical displacement currents similar to those identified elsewhere as sodium gating currents have been recorded in the giant axon of Myxicola , and their characteristics are briefly described.

Asymmetrical displacement currents

Nature ◽  
1978 ◽  
Vol 271 (5645) ◽  
pp. 586-587
Author(s):  
D. J. ADAMS ◽  
P. W. GAGE
Keyword(s):  
Displacement Currents ◽  
Asymmetrical Displacement

Asymmetrical displacement currents in nerve cell membrane and effect of internal fluoride

Nature ◽  
1977 ◽  
Vol 267 (5606) ◽  
pp. 70-72 ◽  
Author(s):  
P. G. KOSTYUK ◽  
O. A. KRISHTAL ◽  
V. I. PIDOPLICHKO
Keyword(s):  
Cell Membrane ◽  
Nerve Cell ◽  
Displacement Currents ◽  
Asymmetrical Displacement ◽  
Nerve Cell Membrane

Pump and displacement currents of reconstituted ATP synthase on black lipid membranes

1988 ◽  
Vol 104 (2) ◽  
pp. 179-191 ◽  
Author(s):  
B. Christensen ◽  
M. Gutweiler ◽  
E. Grell ◽  
N. Wagner ◽  
R. Pabst ◽  
...  
Keyword(s):  
Atp Synthase ◽  
Lipid Membranes ◽  
Black Lipid Membranes ◽  
Displacement Currents

On modeling a well casing for resistivity and induced polarization

Geophysics ◽  
1984 ◽  
Vol 49 (11) ◽  
pp. 2061-2063 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Electrical Properties ◽  
Electric Dipole ◽  
Free Space ◽  
Eddy Currents ◽  
Interfacial Polarization ◽  
Induced Polarization ◽  
Mutual Impedance ◽  
The Earth ◽  
Horizontal Electric Dipole ◽  
Displacement Currents

In a previous communication I proposed an analytical model to simulate the electromagnetic (EM) and induced polarization (IP) response of a metal well casing (Wait, 1983). To facilitate the analysis, the earth was idealized as a homogeneous conducting half‐space of electrical properties (σ, ε, μ). The well casing was represented as a filamental vertical conductor of semiinfinite length that was characterized by a series axial impedance to account for eddy currents and interfacial polarization. A further basic simplification was to neglect displacement currents in the air; this was justified when all significant distances were small compared with the free‐space wavelength. Initially, the source was taken to be a horizontal electric dipole or current element I ds on the air‐earth interface. By integration of the results, the mutual impedance between two grounded circuits could be ascertained. In the absence of the vertical conductor (i.e., the well casing) the results reduced to those given by Sunde (1968) and Ward (1967).

scholarly journals Filamentary Alfvénic structures excited at the edges of equatorial plasma bubbles

2007 ◽  
Vol 25 (10) ◽  
pp. 2159-2165 ◽  
Author(s):  
R. Pottelette ◽  
M. Malingre ◽  
J. J. Berthelier ◽  
E. Seran ◽  
M. Parrot
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Plasma Bubble ◽  
Plasma Bubbles ◽  
Wave Measurements ◽  
Demeter Satellite ◽  
Equatorial Plasma Bubbles ◽  
Background Magnetic Field ◽  
Gravity Driven ◽  
Displacement Currents

Abstract. Recent observations performed by the French DEMETER satellite at altitudes of about 710 km suggest that the generation of equatorial plasma bubbles correlates with the presence of filamentary structures of field aligned currents carried by Alfvén waves. These localized structures are located at the bubble edges. We study the dynamics of the equatorial plasma bubbles, taking into account that their motion is dictated by gravity driven and displacement currents. Ion-polarization currents appear to be crucial for the accurate description of the evolution of plasma bubbles in the high altitude ionosphere. During their eastward/westward motion the bubbles intersect gravity driven currents flowing transversely with respect to the background magnetic field. The circulation of these currents is prohibited by large density depressions located at the bubble edges acting as perfect insulators. As a result, in these localized regions the transverse currents have to be locally closed by field aligned currents. Such a physical process generates kinetic Alfvén waves which appear to be stationary in the plasma bubble reference frame. Using a two-dimensional model and "in situ" wave measurements on board the DEMETER spacecraft, we give estimates for the magnitude of the field aligned currents and the associated Alfvén fields.

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