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Applied and Environmental Microbiology, April 2002, p. 2054-2056, Vol. 68, No. 4
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.4.2054-2056.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Energy Generation by Extracellular Aldose Oxidation in N2-Fixing Gluconacetobacter diazotrophicus

María F. Luna, Cecilia E. Bernardelli, Carlos F. Mignone, and José L. Boiardi*

CINDEFI, Facultad de Ciencias Exactas, Universidad Nacional de La Plata-CONICET, 1900 La Plata, Argentina

Received 21 September 2001/ Accepted 4 January 2002

Gluconacetobacter diazotrophicus PAL3 was grown in a chemostat with N2 and mixtures of xylose and gluconate. Xylose was oxidized to xylonate, which was accumulated in the culture supernatants. Biomass yields and carbon from gluconate incorporated into biomass increased with the rate of xylose oxidation. By using metabolic balances it is demonstrated that extracellular xylose oxidation led N2-fixing G. diazotrophicus cultures to increase the efficiency of energy generation.


* Corresponding author. Mailing address: CINDEFI, Facultad de Ciencias Exactas, UNLP, Calles 47 y 115, 1900 La Plata, Argentina. Phone and fax: 54 221 4833794. E-mail: boiardi{at}quimica.unlp.edu.ar.


Applied and Environmental Microbiology, April 2002, p. 2054-2056, Vol. 68, No. 4
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.4.2054-2056.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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  • Perlova, O., Ureta, A., Nordlund, S., Meletzus, D. (2003). Identification of Three Genes Encoding PII-Like Proteins in Gluconacetobacter diazotrophicus: Studies of Their Role(s) in the Control of Nitrogen Fixation. J. Bacteriol. 185: 5854-5861 [Abstract] [Full Text]