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Effect of CO2 on the fermentation capacities of the acetogen Peptostreptococcus productus U-1

Title data

Misoph, Martina ; Drake, Harold L.:
Effect of CO2 on the fermentation capacities of the acetogen Peptostreptococcus productus U-1.
In: Journal of Bacteriology. Vol. 178 (1996) Issue 11 . - pp. 3140-3145.
ISSN 1098-5530

Abstract in another language

The fermentative capacities of the acetogenic bacterium Peptostreptococcus productus strain U-1 (ATCC 35244) were examined. Although acetate was formed from all substrates tested, additional products were also produced in response to CO2 limitation. Under CO2-limited conditions, fructose-dependent growth yielded high levels of lactate as a reduced end product; lactate was also produced under CO2-enriched conditions when fructose concentrations were elevated. In the absence of supplemental CO2, xylose-dependent growth yielded lactate and succinate as major reduced end products. Although supplemental CO2 and acetogenesis stimulated cell yields on fructose, xylose-dependent cell yields were decreased in response to CO2 and acetogenesis. In contrast, glycerol-dependent growth yielded high levels of ethanol in the absence of supplemental CO2, and pyruvate was subject to only acetogenic utilization independent of CO2. CO2 pulsing during the growth of CO2-limited fructose cultures stopped lactate synthesis immediately, indicating that CO2-limited cells were nonetheless metabolically poised to respond quickly to exogenous CO2. Resting cells that were cultivated at the expense of fructose without supplemental CO2 readily consumed fructose in the absence of exogenous CO2 and formed only lactate. Although the specific activity of lactate dehydrogenase was not appreciably influenced by supplemental CO2 during cultivation, cells cultivated on fructose under CO2-enriched conditions displayed minimal capacities to consume fructose in the absence of exogenous CO2. These results demonstrated that the utilization of alternative fermentations for the conservation of energy and growth of P. productus U-1 is augmented by the relative availability of CO2 and growth substrate.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER6728
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Ecological Microbiology
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 30 Sep 2015 05:56
Last Modified: 30 Sep 2015 05:56
URI: https://eref.uni-bayreuth.de/id/eprint/20008