Abstract

Movements of individual E. coli bacteria in solution are detected by a one-dimensional fringe system formed in the focal region of two crossed laser beams. The time modulation of the scattered light intensity is used to deduce the instantaneous speed of the bacterial motion as it enters into the focal region. A method is described as being capable of testing the isotropic speed distribution function without the complications associated with the finite size and structural effects that influence the interpretation of the conventional light-scattering spectra.

© 1978 Optical Society of America

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