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. Author manuscript; available in PMC: 2009 Sep 14.
Published in final edited form as: Mol Imaging. 2008 Sep–Oct;7(5):222–233.

Figure 4.

Figure 4

Bioluminescence signal intensity correlated with Salmonella inoculum dose. Photon flux signals from invasion assays of HT29 cells across a 20-fold dilution range of invasion-competent (invC+) bioluminescent Salmonella. Because eukaryotic cell numbers per well were constant, this also corresponds to 20-fold range of multiplicity of infection. In wells lacking eukaryotic cells, photon flux signals approach ambient background. The results are from quadruplicate samples, with photon flux data (in units of photons/second) shown as means (± SD).