scholarly journals Photon emission in strong fields beyond the locally-constant field approximation

2019 ◽  
Vol 100 (11) ◽  
Author(s):  
I. A. Aleksandrov ◽  
G. Plunien ◽  
V. M. Shabaev
Keyword(s):  
Photon Emission ◽  
Field Approximation ◽  
Constant Field ◽  
Strong Fields

scholarly journals Improved local-constant-field approximation for strong-field QED codes

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
A. Di Piazza ◽  
M. Tamburini ◽  
S. Meuren ◽  
C. H. Keitel
Keyword(s):  
Strong Field ◽  
Field Approximation ◽  
Constant Field

scholarly journals A thermodynamic description for physiological transmembrane transport

F1000Research ◽  
2021 ◽  
Vol 7 ◽  
pp. 1468
Author(s):  
Marco Arieli Herrera-Valdez
Keyword(s):  
Common Ground ◽  
Transmembrane Potential ◽  
Thermodynamic Description ◽  
Field Approximation ◽  
Transmembrane Transport ◽  
Constant Field ◽  
Asymmetric Flow ◽  
Biophysical Study ◽  
Transmembrane Currents ◽  
Existing Data

A general formulation for both passive and active transmembrane transport is derived from basic thermodynamical principles. The derivation takes into account the energy required for the motion of molecules across membranes and includes the possibility of modeling asymmetric flow. Transmembrane currents can then be described by the general model in the case of electrogenic flow. As it is desirable in new models, it is possible to derive other well-known expressions for transmembrane currents as particular cases of the general formulation. For instance, the conductance-based formulation for current turns out to be a linear approximation of the general formula for current. Also, under suitable assumptions, other formulas for current based on electrodiffusion, like the constant field approximation by Goldman, can be recovered from the general formulation. The applicability of the general formulations is illustrated first with fits to existing data, and after, with models of transmembrane potential dynamics for pacemaking cardiocytes and neurons. The general formulations presented here provide a common ground for the biophysical study of physiological phenomena that depend on transmembrane transport.

scholarly journals Radiatively induced Lorentz and CPT violation in Schwinger constant field approximation

2001 ◽  
Vol 503 (1-2) ◽  
pp. 215-222 ◽  
Author(s):  
M. Chaichian ◽  
W.F. Chen ◽  
R. González Felipe
Keyword(s):  
Field Approximation ◽  
Constant Field ◽  
Cpt Violation

scholarly journals A thermodynamic description for physiological transmembrane transport

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 1468 ◽  
Author(s):  
Marco Arieli Herrera-Valdez
Keyword(s):  
Common Ground ◽  
Transmembrane Potential ◽  
Thermodynamic Description ◽  
Field Approximation ◽  
Transmembrane Transport ◽  
Constant Field ◽  
Asymmetric Flow ◽  
Biophysical Study ◽  
Transmembrane Currents ◽  
Existing Data

A general formulation for both passive and active transmembrane transport is derived from basic thermodynamical principles. The derivation takes into account the energy required for the motion of molecules across membranes, and includes the possibility of modeling asymmetric flow. Transmembrane currents can then be described by the general model in the case of electrogenic flow. As it is desirable in new models, it is possible to derive other well known expressions for transmembrane currents as particular cases of the general formulation. For instance, the conductance-based formulation for current turns out to be a linear approximation of the general formula for current. Also, under suitable assumptions, other formulas for current based on electrodiffusion, like the constant field approximation by Goldman, can also be recovered from the general formulation. The applicability of the general formulations is illustrated first with fits to existing data, and after, with models of transmembrane potential dynamics for pacemaking cardiocytes and neurons. The general formulations presented here provide a common ground for the biophysical study of physiological phenomena that depend on transmembrane transport.

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