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 μmax to be 0.065 h-1 and the saturation affinity constant K s to be 6.7 μM. The value of the inhibition constant K i was estimated in batch cultures and was found to be approximately 1100 μM. When grown on monosulfide, the organism was capable of trisulfide utilization without lag. Monosulfide-limited growth was established to have a μmax of 0.091 h-1 and K s of 8.0 μM. Field observations revealed polysulfide, present at supra-optimal concentrations, as a major pool of reduced sulfur in a laminated marine sediment ecosystem.
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Abbreviations
- DLP:
-
Direct Linear Plot
- TS:
-
Total Sugar
- SS:
-
Structural Sugar
- P :
-
Protein
- R R :
-
concentration of growth limiting nutrient in reservoir vessel
- S nutrient :
-
residual concentration of growth-limiting nutrient in the culture vessel
- S sulfur compound :
-
concentration of sulfur in the corresponding compound
- D :
-
dilution rate
- μmax :
-
maximum specific growth rate
- K s :
-
saturation constant
- K i :
-
inhibition constant
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Dedicated to Prof. Dr. Norbert Pfennig on the occasion of his 65th birthday
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Visscher, P.T., Nijburg, J.W. & van Gemerden, H. Polysulfide utilization by Thiocapsa roseopersicina . Arch. Microbiol. 155, 75–81 (1990). https://doi.org/10.1007/BF00291278
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DOI: https://doi.org/10.1007/BF00291278