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Document Number | 1420 |
|---|---|
Primary Title | Fermentation and Anaerobic Respiration by Rhodospirillum-Rubrum and Rhodopseudomonas-Capsulata |
Author Name | Schultz, J. E.;Weaver, P. F. |
Author Affiliation | Solar Energy Research Inst., Golden, CO |
Published Date | 01/01/1982 |
Detailed Publish Date | Jan 1982 |
Title Source | Journal of Bacteriology |
Volume Number | 149 |
Issue Number | 1 |
Page Range | 181-190 |
Page Count | 10 |
Document Type | JOURNAL ARTICLE |
Abstract | R. rubrum and R. capsulata were able to grow anaerobically in the dark either by a strict mixed-acid fermentation of sugars or, in the presence of an appropriate electron acceptor, by an energy-linked anaerobic respiration. Both species fermented fructose without the addition of accessory oxidants, but required the initial presence of bicarbonate before fermentative growth could begin. Major products of R. rubrum fermentation were succinate, acetate, propionate, formate, H2 and CO2; R. capsulata produced major amounts of lactate, acetate, succinate, H2 and CO2. R. rubrum and R. capsulata were also capable of growing strictly through anaerobic, respiratory mechanisms. Nonfermentable substrates, such as succinate, malate or acetate, supported growth only in the presence of an electron acceptor such as dimethyl sulfoxide or trimethylamine oxide. CO2 and dimethyl sulfide were produced during growth of R. rubrum and R. capsulata on succinate plus dimethyl suffoxide. Molar growth yields from cultures grown anaerobically in the dark on fructose plus dimethyl sulfoxide were 3.8-4.6 times higher than values obtained from growth on fructose alone, and were 56-60% of the values obtained from aerobic, respiratory growth with fructose. Likewise, molar growth yields from anaerobic, respiratory growth conditions with succinate plus dimethyl sulfoxide were 51-54% of the values obtained from aerobic, respiratory growth with succinate. When dimethyl sulfoxide or trimethylamine oxide acts as a terminal oxidant the process is 33-41% as efficient as O2 in conserving energy through electron transport-linked respiration. |
Copyright Status | Y - Copyrighted--no reprint permission, |
Document Owner | B |