Quantitative Estimation of Streptothricin

Abstract
A modified cup method is described which is based on zone of inhibition produced by diffusion of streptothricin out into an agar plate seeded with Bacillus subtilis spores. A standard curve employing different levels of a standard streptothricin prepn. is made each day and unknowns are measured in terms of the arbitrarily designated standard streptothricin unit.

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