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Effect of ultrasonication on the number of total (A and B) and fluorescent (C and D) bacterial CFU retained on Isopore polycarbonate filters with 5-μm-diameter pores. Bars represent the mean population densities retained on filters after sonication of three aliquots for each combination of time and amplitude. Error bars indicate the standard error. Panels A and C and panels B and D represent the results of two independent trials.
