Leucine concentration jumps (applied by photolysis of inert derivatives) triggered swim or tumble responses in Escherichia coli mutants lacking Tsr or Tar, respectively. Wild-type E. coli bacteria were attracted in spatial assays when the initial leucine concentration difference was 5 to 120 micro M but were repulsed when it was over 0.5 mM. Their responses to concentration jumps confirmed earlier deductions regarding biphasic excitation.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC305766 | PMC |
| http://dx.doi.org/10.1128/JB.186.2.588-592.2004 | DOI Listing |
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