scholarly journals Porphyrins for Probing Electrical Potential Across Lipid Bilayer Membranes by Second Harmonic Generation

2013 ◽  
Vol 125 (34) ◽  
pp. 9214-9218 ◽  
Author(s):  
James E. Reeve ◽  
Alex D. Corbett ◽  
Igor Boczarow ◽  
Wojciech Kaluza ◽  
William Barford ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Lipid Bilayer ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Electrical Potential ◽  
Lipid Bilayer Membranes ◽  
Bilayer Membranes

scholarly journals Porphyrins for Probing Electrical Potential Across Lipid Bilayer Membranes by Second Harmonic Generation

2013 ◽  
Vol 52 (34) ◽  
pp. 9044-9048 ◽  
Author(s):  
James E. Reeve ◽  
Alex D. Corbett ◽  
Igor Boczarow ◽  
Wojciech Kaluza ◽  
William Barford ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Lipid Bilayer ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Electrical Potential ◽  
Lipid Bilayer Membranes ◽  
Bilayer Membranes

scholarly journals Chloride Transport in Porous Lipid Bilayer Membranes

1973 ◽  
Vol 61 (6) ◽  
pp. 809-830 ◽  
Author(s):  
Thomas E. Andreoli ◽  
Mary L. Watkins
Keyword(s):  
Lipid Bilayer ◽  
Electrical Potential ◽  
Debye Length ◽  
Flux Ratio ◽  
Volume Flow ◽  
Membrane Thickness ◽  
Constant Field ◽  
Lipid Bilayer Membranes ◽  
Bilayer Membranes ◽  
Simple Diffusion

This paper describes dissipative Cl- transport in "porous" lipid bilayer membranes, i.e., cholesterol-containing membranes exposed to 1–3 x 10-7 M amphotericin B. PDCl (cm·s-1), the diffusional permeability coefficient for Cl-, estimated from unidirectional 36Cl- fluxes at zero volume flow, varied linearly with the membrane conductance (Gm, Ω-1·cm-2) when the contributions of unstirred layers to the resistance to tracer diffusion were relatively small with respect to the membranes; in 0.05 M NaCl, PDCl was 1.36 x 10-4 cm·s-1 when Gm was 0.02 Ω-1·cm-2. Net chloride fluxes were measured either in the presence of imposed concentration gradients or electrical potential differences. Under both sets of conditions: the values of PDCl computed from zero volume flow experiments described net chloride fluxes; the net chloride fluxes accounted for ∼90–95% of the membrane current density; and, the chloride flux ratio conformed to the Ussing independence relationship. Thus, it is likely that Cl- traversed aqueous pores in these anion-permselective membranes via a simple diffusion process. The zero current membrane potentials measured when the aqueous phases contained asymmetrical NaCl solutions could be expressed in terms of the Goldman-Hodgkin-Katz constant field equation, assuming that the PDNa/PDCl ratio was 0.05. In symmetrical salt solutions, the current-voltage properties of these membranes were linear; in asymmetrical NaCl solutions, the membranes exhibited electrical rectification consistent with constant-field theory. It seems likely that the space charge density in these porous membranes is sufficiently low that the potential gradient within the membranes is approximately linear; and, that the pores are not electrically neutral, presumably because the Debye length within the membrane phase approximates the membrane thickness.

Test of directional photoionisation models of second harmonic generation in optical fibres

1992 ◽  
Vol 139 (2) ◽  
pp. 133 ◽  
Author(s):  
N.M. Lawandy ◽  
T.J. Driscoll ◽  
C.L. Adler ◽  
N.M. Lawandy
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Optical Fibres
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