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Appl Environ Microbiol. 1989 July; 55(7): 1801-1807
Copyright © 1989, American Society for Microbiology. All Rights Reserved.

Determination of Biomass by Ultrasonic Measurements

Institut für Biomedizinische Technik, University of Stuttgart, Seidenstrasse 36, D 7000 Stuttgart, Federal Republic of Germany

ABSTRACT

The quantitative determination of biomass in a suspension by means of ultrasound velocity is a simple and on-line-applicable method. Such an ultrasonic sensor offers the advantage of being long-term stable, reliable, and sterilizable. In this paper we present sound velocity measurements made with different microorganisms. The experimental results which we have obtained with an impulse-echo method will be compared with theoretical predictions and discussed with respect to previous findings (Y. Ishimori, I. Karube, and S. Suzuki, Appl. Environ. Microbiol. 42:632-637, 1981).

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