The Journal of General Physiology
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The Journal of General Physiology, Vol 13, 553-556, Copyright © 1930 by The Rockefeller University Press

ARTICLE

A METHOD FOR THE QUANTITATIVE ESTIMATION OF BACTERIA IN SUSPENSIONS

Albert P. Krueger 1

1 From the Laboratories of The Rockefeller Institute for Medical Research, Princeton, N. J.

A method is described for estimating the cell concentration of bacterial suspensions by measurement of the column lengths of packed cells centrifuged into a capillary tube of fine bore. The total error, under the experimental conditions employed, checked by direct count, was >2 per cent for dense suspensions and about 5 per cent for light suspensions. The method is suitable for work requiring rapid and accurate routine preparation of bacterial suspensions of known cell concentrations.

Accepted on March 19, 1930


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A. P. Krueger
THE QUANTITATIVE DETERMINATION OF BACTERIOPHAGE
Science, November 14, 1930; 72(1872): 507 - 508.
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