The group constitutes a number of species of bacteria producing large quantities of propionic acid from carbohydrates. The generic diagnosis of the group is: Propionibacterium, Orla-Jensen, 1909. Gram positive, non-sporulating non-motile short rods showing marked morphological variation in acid media or when grown under aerobic conditions; normal growth anaerobic. Cultures are catalase positive. Carbohydrates, glucosides and alcohols attacked with the production of propionic acid, acetic acid and CO2. The species are differentiated on the basis of sugar fermentation, nitrate reduction, pigment production and morphology. A key to the species is given with a description of each.
Proceedings of the Iowa Academy of Science
©1929 Iowa Academy of Science, Inc.
Kendall, Sara E. and Werkman, C. H.
"Physiological Behavior of the Propionic Acid Group of Bacteria,"
Proceedings of the Iowa Academy of Science, 36(1), 111-111.
Available at: https://scholarworks.uni.edu/pias/vol36/iss1/17