McCutcheon index

The McCutcheon index or chemotactic ratio is the ratio of the net displacement of a bacterium to the length of its actual path.^[1][2]

${\displaystyle {\text{McCutcheon index}}={{\text{Displacement}} \over {\text{Distance}}}.}$

It is named after Morton McCutcheon who introduced it to describe chemotaxis in leukocytes.

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