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IMPROVEMENTS IN DETERMINING TOTAL COUNTS OF BACTERIA
Author(s) -
Norris K. P.,
Powell E. O.
Publication year - 1961
Publication title -
journal of the royal microscopical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0368-3974
DOI - 10.1111/j.1365-2818.1961.tb00475.x
Subject(s) - systematic error , sampling (signal processing) , simple (philosophy) , statistics , random error , sampling error , mathematics , computer science , observational error , optics , physics , detector , philosophy , epistemology
SYNOPSIS An interferometric method of measuring the thickness of counting chambers is described. It is simple enough to be used every time a chamber is assembled. Accurate measurement of chamber depth removes a large systematic error from total counts as ordinarily calculated. Experiments on various other details of counting technique lead to recommendations conducive to still further improvement. The standard error of a count under the best conditions need be no more than 50 p.c. greater than the error due to random sampling.