Diffusion coefficients and mean diameters of estuarine bacterial isolates and particulates from Bayboro Harbor water, St. Petersburg, FL, were measured by photon correlation spectroscopy (PCS) employing a Coulter N4 Submicron Particle Analyzer. Mean diameters of formalin-killed bacteria by PCS agreed with those obtained from Nomarski Interference and epifluorescence microscopy. Diffusion coefficients of motile bacteria were 1.3–4.4 times greater than for formalin-killed bacteria, and PCS-estimated diameters were accordingly smaller. Analysis of Bayboro Harbor water by PCS indicated a highly variable distribution of particle diameters in unfiltered water samples. Filtration through 3-, 1-, 0.4-, and 0.2-μm Nucleopore filters resulted in progressively smaller, reproducible particle diameter distributions, which again agreed with measurements made by epifluorescence microscopy.
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Measurement of diameters of estuarine bacteria and particulates in natural water samples by use of a submicron particle analyzer