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Appl Environ Microbiol. 1965 November; 13(6): 931-934
Copyright © 1965 American Society for Microbiology. All Rights Reserved.

Evaluation of an Automatic Electronic Device for Counting Bacterial Colonies

U.S. Army Biological Laboratories, Fort Detrick, Frederick, Maryland

ABSTRACT

An automatic colony counter was tested extensively with colonies of two bacterial species, Serratia marcescens and Bacillus subtilis var. niger, grown on agar media. A stable relationship was established between machine counts and counts done visually by technicians. The calibration curve and estimates of the efficiency of the machine are presented and discussed. It is estimated that a 40% reduction in colony counting time is feasible through use of the machine.