bei Google ScholarTitelangaben
Misoph, Martina ; Drake, Harold L.:
Effect of CO2 on the fermentation capacities of the acetogen Peptostreptococcus productus U-1.
In: Journal of Bacteriology.
Bd. 178
(1996)
Heft 11
.
- S. 3140-3145.
ISSN 1098-5530
Abstract
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.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER6728 |
| Institutionen der Universität: | Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Ökologische Mikrobiologie Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 30 Sep 2015 05:56 |
| Letzte Änderung: | 30 Sep 2015 05:56 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/20008 |