Abstract

A simple improved method including sonication treatment is proposed to determine accurate cell and spore counts forBacillus sphaericus, a microorganism which can form cell aggregates. Sonication (10 watt power output) for 40 seconds after dilution of culture broth was effective in dispersing clumps of cells and spores without disruption. This improved method gave approximately 2 times higher cell and spore counts compared with the conventional counting methods (without sonication).

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