Description Usage Arguments Value Author(s) See Also Examples

Calculates the resistance of a pipette tip, as the sum of its internal conical resistance and external access resistance. Pipette geometry is specified in terms of length, tip radius and half-cone angle.

1 | ```
resist.total(r, l, theta, rho = 51)
``` |

`r` |
Pipette tip (inner) radius, in microns. |

`l` |
Pipette length, in microns. Note that resistance contribution falls of markedly away from the tip, so the exact length may not be crucially important. |

`theta` |
Pipette internal half-cone angle, in radians. |

`rho` |
Resistivity of the pipette filler medium, in ohm centimetres. The default value of 51 ohm cm corresponds to a 150 mM solution of KCl. |

The calculated total resistance, in ohms.

Matthew Caldwell

`resist.access`

, `resist.cone`

, `resist.breakage`

1 2 3 4 | ```
# total resistance for a 30 micron long pipette tip with a half-cone angle of 4 degrees
# and a tip radius of 50nm, with a filler/bath resistivity of 64 ohm cm
# converting result from ohms to megohms for readability
resist.total(r=0.05, l=30, theta=4*pi/180, rho=64) * 1e-6
``` |

```
Loading required package: Imap
[1] 60.10974
```

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