Quantitative Modeling of Escherichia coli Chemotactic Motion in Environments Varying in Space and Time
Figure 3
Dependence of chemotaxis motion on the adaptation rate.
(A) The chemotaxis drift velocity for different exponential gradient
. Different symbols represent different adaptation rates
. Note that
first increases linearly (dashed line) with
before reaching a saturation velocity at a critical gradient
,. We can fit
with:
, in which
is the chemotaxis motility constant given by the linear fitting coefficient and the saturation drift velocity is
. The dependences of
and
on
are shown in (B) and (C) respectively. For the range of
we studied, we found that
is roughly independent of
and
depends on
with a simple scaling relation:
.