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The Utilisation of Citrates and the Fermentation of Cellobiose by Strains of Bacterium Coli Isolated from Human Faeces

Published online by Cambridge University Press:  15 May 2009

C. E. Skinner
Affiliation:
Department of Bacteriology and Immunology, University of Minnesota, Minneapolis, Minnesota, U.S.A.
H. G. Brudnoy
Affiliation:
Department of Bacteriology and Immunology, University of Minnesota, Minneapolis, Minnesota, U.S.A.
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1. Of 585 strains of lactose-fermenting aerobes each isolated from faeces of a different person, 501 did not utilise citrate or ferment cellobiose; 20 were citrate negative and cellobiose positive; 27 were cellobiose negative and citrate positive; and 37 were positive to both tests.

2. Almost 10 per cent, of the strains isolated were indol negative.

3. One culture was methyl-red negative and Voges-Proskauer positive. Two were positive to both tests. The rest were methyl-red positive and Voges-Proskauer negative.

4. It is concluded that the results are not favourable to the use of the citrate or the cellobiose test in routine water analysis.

5. A discussion of the taxonomy of the lactose-fermenting aerobes is given. Only two species, Bacterium coli (Escherich) L. and N., and Bacterium aerogenes (Escherich) Chester, are recognised.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1932

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