Abstract— Experiments on cell survival in concentrated suspensions of Escherichia coli B/r show that application of the well known “Morowitz correction” (H. J. Morowitz, (1950) Science111, 229–230) can lead to large errors in estimation of the average fluence per cell if light scattering is not taken into account. The magnitude of the effect is illustrated for this organism, but it is pointed out that experimenters should determine the correction for each organism and set of experimental conditions used.
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