THE EXTRA OXYGEN CONSUMED DURING GROWTH OF SERRATIA MARCESCENS AS A FUNCTION OF THE CARBON AND NITROGEN SOURCES AND OF TEMPERATURE

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Abstract
The O2 consumption of S. marcescens was studied during growth and also with the cells in a resting condition. The rate of O2 consumption by growing cells is significantly higher than that of resting cells when growth is supported by such N sources as ammonia, alanine, urea, or asparagine with carbon supplied as citrate, glycerol, or pyruvate. The quantity of O2 associated with the assimilation of known quantities of each N source was found to vary over a 3-fold range depending on the temp. and the nature of both the N and C sources. It was likewise modified by adding sulfathiazole. The observations are discussed briefly in relation to some of the current ideas about the chemical changes which might be involved.

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