Abstract
Koser1 showed that all types of B. coli are capable of growth in a simple medium in which ammonium phosphate constitutes the source of nitrogen, and a fermentable carbohydrate such as glucose or lactose is the source of carbon; when citric acid is substituted for the carbohydrates, growth occurs only with the sub-group known as Aerobacter-Cloacæ. Growth in such medium, called Koser's test, has since become one of the basic criteria in differentiating the Koser-negative E. coli from the Koser-positive members of the Escherichia tribe.
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References
Koser, S. A., J. Bact., 8, 493 (1923).
Pucher, G. W., Sherman, C. C., and Vickery, H. B., J. Biol. Chem., 113, 235 (1936).
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LOMINSKI, I., CONWAY*, N., HARPER, E. et al. Utilization of Citric Acid by some So-called Citrate-non-Utilizing Bacteria. Nature 160, 573–574 (1947). https://doi.org/10.1038/160573b0
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DOI: https://doi.org/10.1038/160573b0
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