Polysulfide utilization by Thiocapsa roseopersicina |
| |
Authors: | P. T. Visscher J. W. Nijburg H. van Gemerden |
| |
Affiliation: | (1) Department of Microbiology, University of Groningen, 9751 NN Haren, The Netherlands |
| |
Abstract: | The purple sulfur bacterium Thiocapsa roseopersicina, being the dominant anoxygenic phototroph in microbial mats, was tested for growth on polysulfide as the electron donor for carbon dioxide fixation. Data collected in continuous cultures revealed max to be 0.065 h-1 and the saturation affinity constant Ks to be 6.7 M. The value of the inhibition constant Ki was estimated in batch cultures and was found to be approximately 1100 M. When grown on monosulfide, the organism was capable of trisulfide utilization without lag. Monosulfide-limited growth was established to have a max of 0.091 h-1 and Ks of 8.0 M. Field observations revealed polysulfide, present at supra-optimal concentrations, as a major pool of reduced sulfur in a laminated marine sediment ecosystem.Non-standard abbreviations DLP Direct Linear Plot - TS Total Sugar - SS Structural Sugar - P Protein - RR concentration of growth limiting nutrient in reservoir vessel - Snutrient residual concentration of growth-limiting nutrient in the culture vessel - Ssulfur compound concentration of sulfur in the corresponding compound - D dilution rate - max maximum specific growth rate - Ks saturation constant - Ki inhibition constantDedicated to Prof. Dr. Norbert Pfennig on the occasion of his 65th birthday |
| |
Keywords: | Polysulfide Monosulfide Electron-donor limited growth Continuous Culture Thiocapsa roseopersicina |
本文献已被 SpringerLink 等数据库收录! |