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A Comparator Method of Assessing Bacterial Plate Counts
Author(s) -
Murphy R. P.,
Tucker C. G.
Publication year - 1970
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1970.tb02245.x
Subject(s) - comparator , plate count , series (stratigraphy) , mathematics , statistics , computer science , bacteria , biology , engineering , electrical engineering , paleontology , voltage , genetics
Summary. The plate count method of assessing total viable counts of bacteria in milk, water, and foods has only a precision of ±25%, and is tedious. In the method here described plate cultures prepared in the usual way are compared visually with a series of standards: the preparation of suitable standards is discussed. By this method it is possible to assess rapidly the numbers of colonies on plates carrying up to 1000 colonies with as little as ±10% error. The speed of examination is virtually independent of the numbers of colonies present.