resist.access {breakage}R Documentation

Calculate access resistance for a pipette tip

Description

Calculates the access resistance for the open pore at the tip of a SICM pipette, using the approximation due to Hall (1975).

Usage

resist.access(r, rho = 51)

Arguments

r

Radius of the pipette tip opening.

rho

Resistivity of the surrounding conductive material, in ohm centimetres. The default value of 51 ohm cm corresponds to a 150 mM solution of KCl.

Value

The calculated access resistance, in ohms.

Author(s)

Matthew Caldwell

References

Hall, James E. 1975 Access resistance of a small circular pore. J. Gen. Physiol., 66(4), 531–532

See Also

resist.access, resist.total, resist.breakage

Examples

# access resistance to a 50nm pipette tip in solution of resistivity 64 ohm cm
# converting result from ohms to megohms for readability
resist.access(r=0.05, rho=64) * 1e-6

[Package breakage version 1.1-1 Index]