Improvements in the Cylinder-Plate Method for Penicillin Assay

Abstract
A 41/2 X 111/2 inch rectangular culture plate for use in the cylinder-plate method of penicillin assay is described. A guide used for dropping cylinders upon the inoculated culture plate is also described. The use of this equipment saves time in large-scale assay work and permits a higher degree of standardization than does the conventional Petri plate technique.

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