Electrophoresis Field-Time Three-Row Scan - Physics for Biophysics Step by Step

Field index sets speed and elapsed time turns that speed into band distance. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Transport has a field part and a time part

Mobility stays at training index 1. Field sets the speed index, then elapsed time sets the band distance.

v_{\text{index}}=\mu E,\qquad x=v_{\text{index}}t

Field and time both affect the band position

The table keeps the model honest by showing the speed index before the distance. These are training indices, not a real gel mobility unit.

\begin{array}{c|c|c|c}E&t&v_{\text{index}}&x\\1&2\ \text{s}&1&2\ \text{m}\\2&3\ \text{s}&2&6\ \text{m}\\3&4\ \text{s}&3&12\ \text{m}\end{array}

The rendered band lands at six meters

For the rendered row, field index 2 and time 3 seconds give distance 6 meters.

2\cdot3\ \text{s}=6\ \text{m}