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ABSTRACT DURING the course of investigations on the utilization of cheese whey by micro-organisms, a strain of _Aerobacter aerogenes_ was found capable of growing in whey and increasing the

total protein of the whey without requiring the addition of a fixed form of nitrogen. Various attempts to convert cheese whey into useful substances by microbiological means have been

covered in the review by Wix and Woodbine1. Cheese whey is a waste product with a high potential energy source in the form of lactose which has been studied in this laboratory as a substrate

for members of the genus _Azotobacter_ 2. This was concerned with increasing the protein content of whey by the production of bacterial cell material. _Azotobacter_ will not use lactose.

Since we found that hydrolysis of the lactose must be followed by the removal of salts and other toxic ingredients in order to support growth of _Azotobacter_, attention was directed to

other microorganisms. An economic advantage of the genus _Azotobacter_ is its nitrogen-fixing ability. Hence, interest was turned to a nitrogen-fixing strain of _Aerobacter aerogenes_ which

was recently discovered in this laboratory3. Pirt4 has shown that the efficiency of conversion of substrate carbon to cell carbon and carbon dioxide by _Aerobacter_ is directly proportional

to the degree of oxygenation of the culture. This indicated that fermentation of whey could be accomplished under aerobic conditions. Access through your institution Buy or subscribe This is

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DURING STORAGE Article Open access 24 April 2023 REFERENCES * Wix, P., and Woodbine, M., _Dairy Sci. Abst._, 20, 539 (1958). Google Scholar  * Pfeffer, M., M.S. thesis, University of

Vermont (1958). * Blanchard, G. C., M.S. thesis, University of Vermont (1958). * Pirt, S. J., _J. Gen. Microbiol._, 16, 59 (1957). Article  CAS  Google Scholar  * Pengra, R. M., and Wilson,

P. W., _J. Bact._, 75, 21 (1958). CAS  PubMed  Google Scholar  * Jensen, V., _Physiol. Plantarum._, 9, 130 (1956). CAS  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND

AFFILIATIONS * Department of Agricultural Biochemistry, University of Vermont, Burlington, Vermont D. B. JOHNSTONE & M. PFEFFER Authors * D. B. JOHNSTONE View author publications You can

also search for this author inPubMed Google Scholar * M. PFEFFER View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and

permissions ABOUT THIS ARTICLE CITE THIS ARTICLE JOHNSTONE, D., PFEFFER, M. Aerobic Fermentation of Whey by a Nitrogen-fixing Strain of _Aerobacter aerogenes_ . _Nature_ 183, 992–993 (1959).

https://doi.org/10.1038/183992a0 Download citation * Issue Date: 04 April 1959 * DOI: https://doi.org/10.1038/183992a0 SHARE THIS ARTICLE Anyone you share the following link with will be

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